JPH06276805A - Elevation controller of paddy field working machine - Google Patents

Abstract

PURPOSE:To improve the workability of the paddy field working machine by enabling to forcibly elevate a working device in the time of the backward travel of the frame, when the paddy field working machine is driven, and by enabling to manually elevate the working machine, when the working machine is housed. CONSTITUTION:The elevation controller of a paddy field working machine in which a counter- ground working device 3 capable of being freely driven and elevated is connected to the rear part of a travel frame 1, in which a manual elevation lever 20 used for the counter-ground working device 3 and capable of being switched into a working position for lowering and grounding the counter-ground working machine in the ON state of the working clutch 11, or into either of a lowering position for lowering and grounding the counter-ground working machine, a neutral position for holding the counter-ground working machine as such and an elevated position for elevating the counter-ground working machine to a pre-set position in the OFF state of the working clutch 11 is disposed, and further in which a hydraulic cylinder is controlled so that the counter-ground working device is elevated to the pre-set position on the basis of the detection operation of a backward movement-detecting switch 27 for detecting that a travel speed change device 7a is operated to a rearward travel position, is characterized in that the manual elevation lever 20 can be operated to the other automatic position different from the above-mentioned operation positions and that the elevation operation on the backward travel is allowed only when the lever is operated to the automatic position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground work device which is connected to a rear part of a traveling machine body by a drive mechanism so as to be capable of being lifted and lowered, and is in a work position where the work clutch is engaged to lower the ground and when the work clutch is disengaged from the ground. A manual lifting lever for the ground work device that can be switched between a lowered position, a neutral position where the position is held as it is, and a raised position where the position is raised to the set position is provided, and the traveling transmission of the traveling machine body is moved to the reverse position. The vehicle is provided with a reverse state detecting means for detecting that it has been operated, and based on the detection operation of the reverse state detecting means, a reverse raising means for controlling the drive mechanism so that the ground working apparatus is raised to a set position. The present invention relates to a lifting control device for paddy work machines.

[0002]

2. Description of the Related Art Conventionally, in a lifting control device for a paddy work machine, when a gear shift operation lever for a traveling transmission device is operated to a reverse position when the ground work device is grounded, for example, in the field, It was configured to forcibly raise the ground work device to the set position regardless of the operation position of the lifting lever.

[0003]

The above-mentioned conventional structure is compulsory because the ground work device located on the rear side of the body may collide with ridges or the like when the body is moved backward for alignment in the field. In addition, the ground work device is lifted up to near the mechanical lift limit position to prevent the work device from being damaged. However, as described above, when it is configured to always move upward when operated in the reverse state, there is an advantage that damage can be prevented during work traveling in the field. However, if the working machine is to be stored in a barn or the like, the ground work device will always be forcibly lifted, and there is an adverse effect such that the storage work becomes difficult to perform. The present invention aims to eliminate the above-mentioned problems.

[0004]

A feature of the present invention is that in the lifting control device for a paddy working machine described at the beginning, the manual lifting lever can be operated to another operation position different from each of the operation positions. In addition, it is provided with a lifting operation restraining means that allows the lifting operation by the backward moving lifting means only when it is operated to the operation position.

[0005]

[Operation] In the case of work traveling in the field, by setting the raising / lowering lever to a different operation position from the above-mentioned operation positions, the ground work device is forcibly operated to move up when the machine is moving backward. Will be. By switching the manual operation lever to each of the work position, the lowered position, the neutral position, and the raised position, the ground work device can be manually moved up and down in a state corresponding to each operation position. At this time, even if the transmission is switched to the reverse drive state, the ground work device does not forcibly rise. Therefore, when the machine body is retracted and stored in a barn or the like, the height can be adjusted to an appropriate height while switching the elevating lever to each of the descending position, the neutral position, and the ascending position.

[0006]

As a result, during work traveling in a field, etc., the ground work device is always forcibly lifted when the machine is moving backward and the ground work device is less likely to be damaged by ridges, etc., The manual lifting operation by switching the lifting lever manually does not require the forced lifting operation associated with the backward movement of the machine, and makes it easier to store the work.

[0007]

Embodiments will be described below with reference to the drawings. Figure 5
Shows a riding type rice transplanter which is an example of a paddy working machine.
This rice transplanter is equipped with a riding type traveling body 1 and a link mechanism 2 at the rear.
The seedling planting device 3 [an example of a ground work device] is connected via a lift cylinder 4 [an example of a drive mechanism] so that it can be freely moved up and down and can be rolled around the front-rear axis, and the machine can be run on a mud surface. It is configured to plant seedlings. An engine 5 is mounted on the front part of the traveling body 1, and the power of the engine 5 is a belt type continuously variable transmission 6,
It is transmitted to the front and rear wheels 8 and 9 via the gear type main transmission 7a in the mission case 7 and is synchronized with the vehicle speed via a planting clutch 11 (an example of a work clutch) which is operated by an electric motor 10 to be turned on and off. The transmission system is configured so that the output is transmitted to the seedling planting device 3. Seedling planting device 3
Is a seedling stand 12 that moves laterally back and forth with a constant stroke in a lateral direction, a planting mechanism 13 that takes out one seedling from the lower end of the seedling stand 12 and plants it in the field, while following ground contact on the mud surface. A plurality of grounding floats 14 that perform leveling operation, and left and right sides of the seedling planting device 3 that draw a running index line in an unplanted area according to the planting work and can be drawn in and out freely.
5 and the like, the wire drawing marker 15 is linked with the wire so as to be automatically stored in association with the raising operation of the seedling planting device 3, and is configured to be automatically held by the lock mechanism (not shown) in the stored state. As shown in FIG. 1, the two-point switchable marker switch 18 is operated in accordance with the vertical switching operation of the marker operating lever 17 provided under the steering handle 16 so as to be swingable, and the electromagnetic solenoid SL is operated.
Selectively release the lock state of the lock mechanism by
As the seedling planting device 3 descends, the wire drawing marker 1 on the desired side
5 is configured to switch to the working posture. The marker switch 18 is urged to return to the neutral state, and the corresponding electromagnetic solenoid SL is operated based on the operation in either direction.
The lock is released by energizing for a certain period of time.

The raising and lowering operation of the seedling planting device 3 is configured so that it can be manually operated based on the operation of the forward / backward swinging type artificial raising / lowering lever 20 arranged on the side of the driver's seat 19 of the machine body control section. A potentiometer-type lever sensor 21 detects the amount of forward and backward operation of the artificial lift lever 20, and a control device 22 equipped with a microcomputer discriminates the output thereof for each set level so that an operating state corresponding to each operating position is obtained. The electromagnetic hydraulic control valve V for the lift cylinder 4 is switched and controlled. That is, when the elevating lever 20 is operated to the “elevated position”, the seedling planting device 3 is forcibly raised to the maximum position. At this time, the link mechanism 2 contacts the upper limit switch SW2 attached to the rear wheel fender 23 to detect that the seedling planting device 3 has risen to the maximum raised position. "Neutral position"
When operated to, the seedling planting device 3 keeps the current level,
When the seedling planting device 3 is operated to the "descent position", the seedling planting device 3 descends until it touches the mud surface. When operated to the “planting position”, the seedling planting device 3 is grounded and lowered, and the electric motor 1
0 is driven to engage and operate the planting clutch 11, and the planting work state is set. Further, a swing lever type lifting operation switch SW1 is provided below the steering handle 16, and a state in which the seedling planting device 3 is forcibly raised to a maximum raised position and a state in which it is lowered to the ground based on the operation of the switch SW1. It can be switched to and.

The seedling planting depth, that is, the seedling planting device 3
The automatic lifting control means A for driving and controlling the lift cylinder 4 is provided so that the height of the surface against mud is constantly maintained.
That is, the vertical swing amount due to the variation of the ground height is detected above the front side of the ground float 14 located in the center of the left and right of the ground float 14 that is swingably provided around the rear horizontal axis X. A potentiometer type float sensor 24 is provided, and the control device 22 switches and controls the electromagnetic hydraulic control valve V of the lift cylinder 4 so that the detection value of the float sensor 24 matches the set value of the potentiometer type sensitivity adjuster 25. is there. The automatic raising / lowering control operates only when the raising / lowering lever 20 is set to the "planting position", the "lowering position" and the "automatic position" described later.

A changeover switch 26 for changing the ascending / descending speed of the lift cylinder 4 in the ascending / descending control operation is provided according to the working situation. When the switch 26 is switched to "2", the ascending / descending speed of the lift cylinder 4 is set to a standard value, and when it is switched to "1", the ascending speed becomes faster than the standard value and the descending speed becomes slower than the standard value. When switched to "3", the ascending speed becomes slower than the standard value and the descending speed becomes faster than the standard value. For normal work, set to "2" position,
If a separate work machine such as a chemical spraying machine is added and the work machine weight is heavy, set it to the "1" position. If you want to level the headland strongly, switch to the "3" position. The change of the ascending / descending speed is performed by appropriately changing and controlling the duty ratio of the pulse drive current with respect to the electromagnetic control valve V.

Further, a reverse detection switch 27, which is turned on when it is detected that the main transmission 7a is operated to the reverse position, is provided in an intermediate portion of the linkage of the speed change lever 28. When the reverse detection switch 27 is turned on, the seedling is turned on. The control device 22 is provided with a backward movement raising means B for forcibly raising the planting device 3 to a high position detected by the upper limit switch SW2 in the form of a control program.

The elevating lever 20 is constructed so that it can be operated to a different "automatic position" different from the respective operating positions, and the elevating operation by the elevating operation switch SW1 is carried out only when it is operated to the "automatic position". Ascending operation restraint means C that allows the operation of the reverse ascending means B while allowing the operation.
Is provided in the form of a control program. More specifically, FIG.
As shown in FIG. 7, the operation lever is configured to be capable of operating from the “neutral position” to the “automatic position” through the path extending laterally outward from the operation path for each of the above-described operation positions of the elevating lever 20. Similarly, the switching to the "automatic position" is determined by the control device 22 by the zone determination of the detection value of the lever sensor 21. That is, the mode switching means B is provided in the control device 22 in the form of a control program, and the control device 22 executes control as follows.

As shown in FIGS. 2 and 3, when the control is started, the detection value of the lever sensor 21 is zone-determined to determine whether or not the "automatic position" is operated [step 1], If it is set, when the reverse detection switch 27 is activated, the seedling planting device 3 is raised to the upper limit position and stopped [steps 2 to 5]. Next, when the raising / lowering operation switch SW1 is operated, if the seedling planting device 3 is not at the upper limit position, it is moved upward until it reaches the upper limit position, and if it is at the upper limit position, it is judged from the detection information of the float sensor 24 and grounded. The seedling planting device 3 is lowered until the float 14 is grounded [steps 6 to 12]. If the marker switch 18 is operated when the seedling planting device 3 descends, the electric motor 10 is driven to engage and operate the planting clutch 11 to shift to the automatic lifting control mode [steps 13 to 15]. If the elevating lever 20 is set to the "automatic position", the above control steps are repeated and the elevating operation by the elevating operation switch SW1 becomes possible. Next, if the elevating lever 20 is not in the "automatic position", it is operated to the operating state based on the functions of "neutral position", "elevated position", "down position", and "planting position", and the "planting position" is selected. It is possible to enter the planting clutch 11 in conjunction with the operation of the marker switch 18 only,
The seedling planting device 3 is lowered to the ground at each of the "lowering position" and the "planting position", and the automatic raising / lowering control mode is set [steps 16 to 31]. The step 1 constitutes the ascending operation restraint means C, and the steps 2 to 5 constitute the backward ascending means B.

It should be noted that reference numerals are added to the claims for facilitating the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a control block diagram.

[Fig. 2] Control flowchart

FIG. 3 is a control flowchart.

[Fig. 4] Operation path diagram of the lifting lever

[Figure 5] Side view of rice transplanter

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling machine 3 Ground work device 4 Drive mechanism 7a Transmission 11 Work clutch 20 Manual elevating lever 27 Reverse state detecting means B Reverse ascending means C Ascending operation restraining means

Claims (1)

[Claims] 1. A drive mechanism (4) at the rear of the traveling vehicle body (1).
The ground work device (3) is connected to be driven up and down by means of the work position (3), and the work position is maintained as it is when the work clutch (11) is engaged and the ground position is lowered, and when the work clutch (11) is disengaged the ground position is lowered. A manual lifting lever (2) for the ground working device (3) which can be freely switched to a neutral position and a raised position for raising the set position.
0) is provided, and reverse traveling state detecting means (27) for detecting that the traveling transmission (7a) in the traveling machine body (1) has been operated to the reverse traveling position is provided. A lifting control device for a paddy work machine, comprising: a backward raising means (B) for controlling the drive mechanism (4) so as to raise the ground working device (3) to a set position based on a detection operation, The manual elevating lever (20) is configured to be operable at another operation position different from each of the operation positions, and the ascending operation by the reverse ascending means (B) is allowed only when the operation position is operated. A lifting control device for a paddy field working machine, which is equipped with lifting operation restraint means (C).