JP3171659B2 - Rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a seedling planting apparatus to a traveling machine body via a link mechanism so as to be driven up and down by an actuator for raising and lowering, and grounding the seedling planting apparatus by manual operation. Elevating operation switches for switching up and down driving are provided between the descending position and the position ascending to the vicinity of the maximum ascending position, and ascending control means for forcibly elevating the seedling planting device when the traveling body is set to the reverse traveling state. Related to rice transplanter.

[0002]

2. Description of the Related Art In order to improve the maneuverability in turning around a ridge during planting work in a field, a rice transplanter as described above requires an operation for raising and lowering the seedling planting device by a switch operation with a small operation stroke. Be able to do it,
When the traveling aircraft is moved backward in the field, the seedling planting device attached to the rear of the aircraft may collide with ridges or the like. Although it was designed to prevent damage to the device beforehand, conventionally, the lift operation mode using the lift operation switch and the lift operation mode when the aircraft was moving backward were controlled and operated separately in parallel. Things were thought.

[0003]

However, according to the above-mentioned conventional structure, the operator accidentally touches the up / down operation switch when the seedling planting apparatus is ascending by the elevating control means during reverse running of the machine. If the raising / lowering operation switch is operated, the mode is switched to the lowering operation mode based on the operation of the raising / lowering operation switch, and the seedling planting device may be lowered from that position. The elevating operation switch is disposed near the steering handle in consideration of its operability, and furthermore, is disposed in an easily operable state. Therefore, the elevating operation switch is provided when the operator operates the steering wheel while looking at the rear of the aircraft. The possibility of erroneous operation due to contact with is increased. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to a feature of the present invention, in the rice transplanter described at the beginning, while the transmission of the traveling body is set to the reverse traveling state, the seedling associated with the operation of the elevation operation switch is set. The present invention is characterized in that a descent restraint means for restraining a descent operation of the planting device is provided.

[0005]

[Function] When the aircraft is moving backward to align the planting streaks on the ridge etc. during work in the field, even if the pilot accidentally operates the elevating operation switch, It is possible to prevent the seedling plant, which has been raised by the control means, from being lowered against the pilot's will. When the transmission of the fuselage is switched from the reverse movement state to the forward movement state, the above-described check state is released, and the descending operation of the planting apparatus can be performed based on the manual operation of the lifting operation switch.

[0006]

Therefore, even if the elevating operation switch is operated due to an erroneous operation while the body is moving backward for the alignment of the planting streak or the like when turning on a ridge in a field, seedlings are inadvertently planted. The device can be lowered to prevent damage due to collisions with ridges, etc., and artificial lowering operation can be performed by the vertical operation switch only when the operator is set in the forward running state where the pilot operates while looking at the front of the aircraft It became possible to work safely.

[0007]

Embodiments will be described below with reference to the drawings. FIG.
Shows a riding rice transplanter. The rice transplanter can be raised and lowered at the rear of the riding type traveling body via a parallel four-link mechanism 1 and can freely roll left and right around the longitudinal axis.
Are connected. The seedling planting apparatus 2 takes out the seedling rest 4 and the seedlings for planting one by one from a lower end portion of the seedling rest 4 in a planting transmission case 3 which also serves as a frame and reciprocates with a constant stroke, and plant the seedlings in a field. A plurality of planting mechanisms 5,
It is provided with three ground floats 6 and the like arranged in parallel on the left and right, and is configured to move up and down by expansion and contraction driving of a hydraulic cylinder 7 (an example of an actuator). As shown in FIG. The rolling operation is performed by a rolling operation mechanism 10 including an electric motor 8 and a screw feed mechanism 9 provided between the mounting table 4 and the back surface side. The hydraulic control valve V for the hydraulic cylinder 7 is of an electromagnetic type, and the electromagnetic control valve V is configured to be driven and controlled by a control device 11 having a microcomputer. That is, as shown in FIG.
The lift lever 13 disposed on the side of the driver's seat 12 of the aircraft control section is configured to be able to artificially exhibit an ascending operation, a descending operation, and a neutral stop state, and is disposed near the steering handle 14. The swing operation type raising / lowering operation switch SW1 is configured so that the raising operation and the lowering operation can alternately appear. That is, the operation amount of the lift lever 13 is detected by the first potentiometer PM1, and the control device 11 performs zone discrimination of the detected value of the first potentiometer PM1 for each predetermined level to determine the ascending position, the neutral position, the descending position, and the planting position. The operation is switched to each operation state of the attachment working position, and when the operation is performed to the ascending position, the hydraulic cylinder 7 is driven to raise the seedling planting apparatus 2 to the maximum ascending position, and when the operation is operated to the neutral position. The control program is configured to hold the seedling planting apparatus 2 at that position, and to execute an automatic raising and lowering control operation as described later when the raising and lowering lever 13 is in any one of the lowering position and the planting operation position. ing. The raising / lowering operation switch SW1 is urged back in a predetermined direction, and when the swing operation is performed against the return urging force, the control device 11 controls to switch between the ascending operation mode and the ground contact descent mode based on the operation. It is composed. That is, when the raising / lowering operation switch SW1 is operated when the seedling planting device 2 is at the planting work grounding position, the control device 11 forcibly switches the electromagnetic control valve V to the raising operation position and raises the seedling planting device 2. When the operation switch SW1 is operated again, the control device 1
1 switches the electromagnetic control valve V to the lowered position, and controls the rising seedling planting apparatus 2 to descend to the ground.
In the planting operation state, the control device 11 is provided with a lift control means A for maintaining the height of the seedling planting device 2 above the ground at a predetermined value in a control program form. That is, the left and right centered floats 6
Is supported so as to be able to swing up and down around the rear fulcrum, and the grounding float 6 according to the change in the height of the seedling planting device 2 with respect to the ground.
The vertical movement based on the contact pressure fluctuation on the front side of the
The control device 11 controls the electromagnetic control valve V of the hydraulic cylinder 7 so that the output value of the second potentiometer PM2 is detected by the potentiometer PM2 and falls within a predetermined setting region, and moves the seedling planting device 2 to a predetermined ground height. To maintain. A reverse detection switch SW2 for detecting that the shift operation lever 16 of the gear type main transmission 15 of the traveling body has been operated to the reverse position is provided. When the reverse detection switch SW2 is in the detection state, the electromagnetic control valve V is automatically turned on. Ascending control means B for setting the seedling planting apparatus 2 in the ascending operation state and forcibly raising the seedling planting apparatus 2
In the control device 11 in the form of a control program. As shown in FIGS. 1 and 3, the reverse detection switch SW2 is supported by the handle post 19 via a bracket 20, and when operated to the reverse position, the relay swing arm 21 of the speed change operation lever 16 comes into contact with the reverse detection switch SW2. It is configured to work. The lifting switch SW1 and the reverse detection switch SW2
A limit switch SW3 for detecting that the seedling planting apparatus 2 has risen to near the maximum ascent position with the operation of is mounted on the rear wheel fender portion 17 of the traveling body, and the middle part of the link mechanism 1 is connected with the ascending operation. The control device 11 switches the electromagnetic control valve V to the neutral position based on the detection operation of the limit switch SW3 to automatically stop the upward drive of the hydraulic cylinder 7 based on the detection operation of the limit switch SW3. I have. While the main transmission 15 of the traveling machine body is set in the reverse traveling state, the vehicle is provided with a descending restraint means for restraining a descending operation of the seedling planting apparatus 2 in accordance with the operation of the elevation operation switch SW1. That is, when the shift operation lever 16 is operated to the reverse position, the lifting operation switch S
A restraint device for restraining the operation of W1 is provided in an interlocked state with the shift operation lever 16. Specifically, as shown in FIG.
The raising / lowering operation switch SW1 is attached and fixed to the handle post 19 near the lower right side of the steering handle 14 via the bracket 22, and a detection operation is performed by swinging the operation piece 23 upward. 2
Numeral 3 is configured to be urged downward to return. The shift operation lever 16 is provided on the left side of the steering handle 14 and is supported by a bracket 24 fixed to a handle post 19 so as to be able to swing back and forth around a horizontal axis X. Further, a swing arm 25 is fixed to a rotation support shaft portion of the shift operation lever 16. And the lifting operation switch S
A horizontal support shaft 27 is rotatably supported near W1 via a bracket 26, and an arm 28 formed on the horizontal support shaft 27 and the swing arm 25 are interlocked and connected via a rod 29, and When the shift operation lever 16 is operated to the reverse position, the support shaft 27 is integrally provided with a traction operation arm 18 (an example of a traction device) that substantially contacts above the switch operation piece 23 to suppress the upward operation. It is formed. Further, when the shift operation lever 16 is switched from the reverse position to the neutral position or the forward traveling position, the check operation arm 18 is separated from the lifting operation switch SW1 and switches to a switch-operable state. The descending restraint means is constituted in this manner.

[Another embodiment] The descending restraint means may be provided in the control device 11 in the form of a control program. In other words, when the reverse detection switch SW2 is in the detection state, even if an operation signal of the lifting operation switch SW1 is input, the switching control of the electromagnetic control valve V to the lower side is stopped,
After the reverse detection switch SW2 is in the non-detection state, control is performed to enable switching control of the electromagnetic control valve V to the descending side based on the operation of the elevation operation switch SW1.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view of a main transmission lever disposition portion.

FIG. 2 is a plan view of a lifting / lowering operation switch mounting portion.

FIG. 3 is a cutaway plan view of a main transmission lever support portion.

FIG. 4 is a control block diagram.

FIG. 5 is a front view of a rolling drive mechanism.

FIG. 6 is an overall side view of the rice transplanter.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 link mechanism 2 seedling planting device 15 transmission B lifting control means SW1 lifting operation switch

Claims (1)

(57) [Claims] 1. A seedling planting device (2) is connected to a traveling machine body via a link mechanism (1) so as to be driven up and down by an elevation actuator (7). A lifting / lowering operation switch (SW1) for switching the device (2) between a contact position and a position where the device (2) is raised to a position close to the maximum lifting position; A rice transplanter having ascending control means (B) for forcibly raising a seedling planting device (2) when set, and a transmission (15) for a traveling body.
A rice transplanter provided with descent control means for controlling the descent operation of the seedling planting device (2) in accordance with the operation of the elevating operation switch (SW1) while the vehicle is set in the reverse running state.