JPH0242088Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a mechanism in which a planting device having a ground float is connected to a traveling body equipped with propulsion wheels, and the planting device is floated above the ground by driving and lowering the propulsion wheels. The present invention relates to a walking rice transplanter that is provided with a mechanism for forcibly returning the wheel drive lifting mechanism to a neutral lifting/lowering state.

In the above-mentioned walk-behind rice transplanter, as a means of streamlining operations when turning the machine or crossing ridges with the planting device floating above the ground, conventionally, in conjunction with the lowering operation of the wheel drive lifting mechanism, The neutral return mechanism is configured to be automatically activated when the propulsion wheel descends by a substantially fixed amount from the planting travel height position, but in this case, only the lowering operation for the wheel drive lifting mechanism is performed. Since the wheel drive elevating mechanism can be automatically returned to the neutral state when the planting device rises by a substantially fixed amount, this time period can be effectively used for other operations; Since the amount of rise above the ground is almost constant, depending on conditions such as the hardness and softness of the plowing surface and the height of the ridges, the ground float of the planting device may push out the mud surface inappropriately, or a part of the planting device may fall into the ridges. It had the disadvantage that it could easily cause trouble if it collided.

In view of the above-mentioned circumstances, the present invention aims to streamline operations when the aircraft turns or goes over ridges, while also allowing the planting device to be carried out smoothly above the ground at an appropriate position according to various conditions. The purpose is to make it possible to move the planting clutch lever from the clutch engaged position to the clutch disengaged position in conjunction with the operation of the planting clutch lever, which interrupts the transmission of power to the planting device, from the clutch engaged position to the clutch disengaged position. Provided with a mechanism that switches the wheel drive lifting mechanism to a lowered state with a single step operation to a midway position on the operating path, and activates a neutral return mechanism with a subsequent two step operation from the midway position to a clutch disengaged position. It is characterized by

In other words, the wheel-driven lifting mechanism can be switched to the lowering state by using the cutting operation of the planting clutch lever, which is an essential operation when turning the aircraft or crossing a ridge while the planting device is floating above the ground. The operating time of the planting clutch lever at the first operating position is adjusted in anticipation of the amount of elevation of the planting device above the ground until the wheel drive elevating mechanism automatically returns to the neutral state due to the two-stage operation of the planting clutch lever. By doing so, the amount of elevation of the planting device from the ground can be freely changed according to various conditions such as the hardness or softness of the plowing surface and the height of the ridges.

Therefore, while streamlining operations such as turning the aircraft and crossing ridges, it has become possible to safely and efficiently perform operations such as aircraft turning and crossing over ridges, while keeping the planting device elevated above the ground to an appropriate position according to various conditions.

Hereinafter, embodiments of the present invention will be described based on the drawings.

The walking rice transplanter shown in Fig. 1 consists of a transmission case 2 directly connected to the rear of the engine 1;
A pair of left and right propulsion wheels 4, 4 are connected via a transmission case 3, 3 that can freely swing up and down around a horizontal axis P at the front end thereof.
A transmission cylindrical frame 6 extending rearward from the transmission case 2 of the traveling machine body 5 equipped with
A planting device 8 having two grounding floats 7, 7 is provided in series at the end of the plant, and one float 9 having a planting surface leveling function is provided in front of the left and right propulsion wheels 4, 4. Further, a mechanism 10 for raising the planting device 8 above the ground by driving and lowering the propulsion wheels 4, 4, and a mechanism 11 for forcibly returning the wheel drive elevating mechanism 10 to a neutral state are provided.

The wheel drive elevating mechanism 10 is provided with a movable frame 13 on the cylindrical frame 6 that is slid in the longitudinal direction of the aircraft by the expansion and contraction operation of the hydraulic cylinder 12, and the movable frame 13 and the propulsion wheels 4, The transmission cases 3, 3 of 4 are interlocked and connected via rods 14, 14, and the propulsion wheels 4, 4 are driven around the horizontal axis P by switching the control valve 15 for the hydraulic cylinder 12. It is configured to be raised and lowered.

Further, the spool 15a of the control valve 15 and the front float 9 are linked via a swingable L-shaped sensing arm 16 and a rod 17,
The control valve 1 is configured to maintain the ground pressure of the front float 9 within a set range based on the vertical displacement of the front float 9 that exceeds a set value due to changes in the ground pressure of the front float 9.
5 is configured to control the operation.

The neutral return mechanism 11 includes the cylindrical frame 6
The engaging member 19, which has a large number of engaging grooves 19a formed on the side that can be engaged with the locking pieces 18 fixed to the movable frame 13, is placed in an engaging position and a non-working position in which it is disengaged. The locking member 19 is pivoted so that it can be switched freely, and the locking member 19 can be moved when the hydraulic cylinder 12 is extended while the locking member 19 is engaged with the locking piece 18 of the movable frame 13. In conjunction with this, a swing arm 20 is provided which forcibly switches the control valve 15 to the vertical neutral state via the sensing arm 16.

Thus, the planting clutch lever 21 that opens and closes the planting clutch 23 interposed in the transmission system to the planting device 8 and the sensing arm 16 are connected by a wire 22.
A and an operating stroke absorbing spring 22C, and the planting clutch lever 21 and the engaging member 19 are linked via a wire 22B. In conjunction with the operation toward the cut position, a mechanism 22 is configured that switches the wheel drive lifting mechanism 10 to a lowered state with a single step operation, and operates the neutral return mechanism 11 with a subsequent second step operation. There is. As a result, when the planting clutch lever 21 is operated from the clutch engaged position shown by the solid line in FIG. It is pulled to the 21 side. Then, the spool 15a of the control valve 15 is operated downward via the sensing arm 16, and the propulsion wheels 4, 4 begin to be operated downward. However, during this time, the wire 22B is not pulled.

Then, when the planting clutch lever 21 is operated from the halfway position to the clutch disengagement position on the right side of the paper, the wire 22B is pulled toward the planting clutch lever 21 and engaged with one engagement groove 19a of the engagement member 19. The stopper piece 18 engages. As a result, the hydraulic cylinder 12 is extended to the right in the drawing, causing the swing arm 20 to push down the sensing arm 16 and return the control valve 15 to the vertical neutral state. Therefore, the lowering of the propulsion wheels 4, 4 is stopped.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of the walking rice transplanter, FIG. 2 is an overall plan view, and FIG. 3 is an elevation control system diagram. 4... Propulsion wheel, 5... Traveling body, 7... Ground float, 8... Planting device, 10... Wheel drive elevating mechanism, 11... Neutral return mechanism, 21... Planting clutch lever, 22... Mechanism .

Claims (1)

[Scope of utility model registration request] A planting device 8 having a grounding float 7 is connected to a traveling body 5 having a propulsion wheel 4, and
A walk-behind rice transplanter is provided with a mechanism 10 that levitates the planting device 8 above the ground by driving and lowering the propulsion wheels 4, and a mechanism 11 that forcibly returns the wheel drive elevating mechanism 10 to an up-and-down neutral state, In conjunction with the operation of the planting clutch lever 21, which intermittents transmission of power to the planting device 8, from the clutch engaged position to the clutch disengaged position, the wheel drive lifting mechanism is activated by one step operation from the clutch engaged position to a midway position on the operating path. 10 to a lowered state, and a mechanism 22 for operating the neutral return mechanism 11 by a subsequent two-step operation from the intermediate position to the clutch disengagement position.