JPS6049445B2 - Pitching device used in riding rice transplanters - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a pitching device for a planting work machine in a riding rice transplanter.

As a riding rice transplanter, a planting machine is connected to the rear of a passenger vehicle body with front and rear wheels so that it can be raised and lowered via an elevating link mechanism that has an upper link and a lower link, and A hydraulic cylinder mechanism for lifting and lowering is interposed between the machine and the planter, and a float is provided at the bottom of the planting machine so that it can swing freely.
It is known that a planting machine is raised and lowered in accordance with the ground pressure of the float due to the vertical movement of the passenger vehicle body, thereby keeping the ground pressure of the float and the planting depth of seedlings constant.

When such a riding-type rice transplanter is performing planting work, if the wheels of the passenger vehicle body touch the unevenness of the tiller in the field and move up and down, the planting machine will also move up and down, causing the rice to be planted. In order to prevent this from becoming unstable, the rear end of the lower link of the lifting link mechanism is pivotally connected to a connecting member provided on the body side of the planting machine, and the connecting member and the upper link are connected. A pitching device has been proposed in which a rear end portion of an upper link is pivotally supported to be movable in the longitudinal direction of an upper link.

However, the riding rice transplanter equipped with this pitching device,
When driving on the road with the planting machine raised,
There is a problem in that noise is generated when the body of the planting machine pitches and the pivot between the front packing connecting member and the rear end of the upper link moves to the front and rear ends of its movement range. The present invention has the lifting link mechanism lock the pitching of the planting work machine by pulling the upper side of the planting work machine forward when the planting work machine is raised, and when the planting work machine is lowered. By interposing a spring member that operates to release the lock and enable free pitching during work, the above-mentioned problem can be solved with a simple configuration and without special operations, making it easy to use when driving on roads, etc. To provide a pitching device for a planting work machine that can eliminate pitching when the machine goes up, can prevent noise caused by the pitching, and allows the pitching work machine to pitch freely during planting work. This is the purpose.

5 Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In the figure, reference numeral 1 denotes a passenger vehicle body, and a body 4 of a planting machine 3 is connected to the rear portion of the passenger vehicle body 1 via an elevating link mechanism 2 .

The passenger vehicle body 1 includes front and rear wheels 5 and 6, is equipped with an engine 7, and is provided with a driver's seat 8 for riding. The elevating link mechanism 2 has an upper link 9 and a lower link 10, and is interposed between the passenger vehicle body 1 and the elevating link mechanism 2, and is used for planting by expanding and contracting its piston 12 by operating a hydraulic cylinder mechanism 11. The working machine 3 can be raised and lowered. The planting machine 3 has a float 13 disposed below the body 4, the rear part of the float 13 is pivotally connected to the body 4, and the front part of the float 13 is attached to be movable up and down by a link mechanism 14 that is freely extendable and retractable. In a planting work state in which the body 4 is lowered and the float 13 slides on the surface of the cultivated soil in the field, the float 1 is lowered by the vertical movement of the passenger vehicle body 1.
The body 4 is raised and lowered according to the ground pressure of the float 13 to keep the ground pressure of the float 13 and the planting depth of the seedlings constant. Further, the planting work machine 3 is configured so that a planting body 15 provided on the machine body 4 cuts out seedlings placed in a seedling tank 16 one by one and plants them in cultivated soil in a field. Note that the above configuration is similar to a conventionally known riding-type rice transplanter. The rear end of the lower link 10 of the lifting link mechanism 2 is connected to the planting work machine 3.
The upper link 9 is pivoted to the lower part of the connecting member 17 provided on the fuselage 4 side, and the upper link 9 is inserted into the elongated hole 18 formed in the upper part of the connecting member
A pin 19 fixed to the rear end is engaged, and the connecting member 1
7 and the rear end of the upper link 9 are slidably supported by a pin 19 in the longitudinal direction of the upper link 9. Further, a locking mechanism 20 that interlocks with the hydraulic cylinder mechanism 11 is connected to the connecting portion j material 17. This locking mechanism 20 has one end of an outer tube 22 of the operation cable 21 fixed to the upper link 9 and the other end fixed to the cylinder 23 of the hydraulic cylinder mechanism 11, respectively, and protrudes from the outer tube 22 of the inner wire 24 of the operation cable 21. A spring 25 is connected to one end of the spring 25, and this spring 25 is connected to the connecting member 17, and the piston 1 of the hydraulic cylinder mechanism 11.
An operating piece 26 protrudes from the outer tube 22, and the other end of the inner wire 24 protruding from the outer tube 22 freely passes through this operating piece 246, and an abutment piece 27 provided at the end abuts against the operating piece 26. It is configured to In the planting work machine pitching device configured as described above, the piston 12 of the hydraulic cylinder mechanism 11 extends, and the lifting link mechanism 2
When the planting machine 3 is rising through the piston 12, the operating piece 26 provided on the piston 12 abuts against the abutting piece 27, applying tension to the spring 25 via the inner wire 24 of the operating cable 21. Since the upper side of the planting machine 3 is strongly pulled forward, the connecting member 17 rotates counterclockwise in the figure, and the pin 19 of the upper link 9 hits the rear end wall of the elongated hole 18j. The pitching of the planting machine 3 is in a locked state.

Therefore, in this target state, the planting machine 3 does not pitch unduly when the passenger vehicle body 1 runs on the road, and the planting machine 3 does not pitch downward. When a large increase occurs, the spring 25 stretches and also acts as a buffer. Also,
The piston 12 of the hydraulic cylinder mechanism 11 contracts, the planting machine 3 descends via the lifting link mechanism 2, and the float 1
3 is in contact with the cultivated soil surface, the operation piece 26 provided on the piston 12 is spaced below the abutment piece 27 as shown in the figure, and the inner wire 24 is loosened and the spring 25 is Since no tension is applied, the pin 19 of the upper link 9 can freely slide in the elongated hole 18 of the connecting member 17, and the aforementioned lock is released and this state is maintained.

Therefore, when the wheels 5 and 6 of the passenger vehicle body 1 move up and down due to the unevenness of the tiller in the field during planting work, the planting work machine 3
can be prevented from freely pitching and moving up and down. It is necessary to maintain an appropriate distance between the operating piece 26 and the abutment piece 27 during this engagement so that no tension is applied to the spring 25 even if the piston 12 extends a little. . In addition, in the present invention, a pin provided in the connecting member may be engaged with a long hole provided in the upper link to allow the upper link to be movably pivoted to the connecting member.

As explained above, the planting work machine pitching device of the riding-type rice transplanter of the present invention uses a spring member that is linked to the vertical movement of the lifting link to pitch the top of the planting work machine when the rice transplanter is raised. The pitching is locked by pulling it forward, and when the planting machine is lowered to perform planting work, the lock is released to allow pitching freely, so that the locking and unlocking can be done by raising and lowering the planting machine. Automatically,
Moreover, the locking mechanism can be carried out without impairing each function and requires special operations, and the locking mechanism can be of a simple structure with a spring member as the main component, and moreover, it can be operated on the road when the planting machine is elevated. It does not generate noise at times, and also provides a buffering effect against the downward movement of the planting machine.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is an explanatory diagram of the main parts thereof. 1...Passenger vehicle body, 2...Elevating link mechanism, 3...
Planting work machine, 4... Airframe, 5... Front wheel, 6... Rear wheel, 9... Upper link, 10... Lower link, 11
...Hydraulic cylinder mechanism, 12... Zeston, 13...
·flow. 17... Connecting member, 18... Long hole,
19... Zen, 20... Lock mechanism, 21... Operation cable, 22... Outer tube, 24... Inner wire, 25... Spring, 26... Operation piece, 27...
...Abutment piece.

Claims (1)

[Claims] 1. In a riding type rice transplanter in which a planting machine is connected to the rear of the vehicle body via an elevating link mechanism so as to be able to pitch freely, the elevating link mechanism is connected to the upper side of the planting machine when the planting machine is raised. A riding-type rice transplanter characterized by interposing a spring member that operates to pull the rice transplanter forward and lock pitching, and to release the lock and enable free pitching when the planting machine is lowered. Planting machine pitching device.