JPH0974839A - Sulky working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the operating efficiency by optionally regulating the lifted height of a seedling transplanting device. SOLUTION: This sulky working machine is obtained by installing a controller capable of starting the lifting of a seedling transplanting device when operating a changeover lever 22 to a lifting position U and starting the lowering of the seedling transplanting device when operating the changeover lever to a lowering position D formed on the side opposite to the lifting position U, a holding mechanism E capable of holding the changeover lever 22 at the neutral position N and the lifting position U, an urging means F for performing the returning operation of the changeover lever to the neutral position N when operating the changeover lever to the lowering position D and then releasing the holding power, an operation stopping means for stopping the lifting operations of the seedling transplanting device when artificially operating the changeover lever 22 held at the lifting position U with the holding mechanism E to the neutral position N and an operation continuing means for continuing the lowering operations of the seedling transplanting device and stopping the seedling transplanting device at the operating height when operating the changeover lever to the lowering position D and then performing operations to return the changeover lever to the neutral position N with the urging mechanism F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding work machine, and more particularly, to a technique for easily raising and lowering a work device connected to a traveling machine body.

[0002]

2. Description of the Related Art Conventionally, as a technique for easily raising and lowering a working device, a lever-shaped operation tool arranged near a steering handle is operated upward in a commercially available device such as a rice transplanter. In this case, control is performed to raise the seedling planting device to the upper limit even after the operating tool is released and the operating tool returns to the neutral position.If the operating tool is operated downward, release the operating tool. There is also one in which the control operation is set so as to perform the control of lowering the seedling planting device to the height at which the ground leveling float comes into contact with the ground even after the operation tool is restored to the neutral position.

[0003]

As described above, in the case where the working device is raised and lowered even after the operating tool is once operated, even when the machine body is swung while the working device is being raised,
It has a good point that the steering operation can be performed easily without raising and lowering the lifting operation.

In addition, taking the planting work at the rice transplanter as an example,
When the aircraft approaches the ridge and raises the seedling planting device to make a turn, when raising the seedling planting device to the upper limit like the conventional one described above and lowering it to the working height, It takes a lot of time to raise and lower the planting device, and after finishing the turning of the aircraft, it becomes necessary to stop the traveling of the aircraft at the planting start position and wait for the seedling planting device to descend to the working height. It is also possible to reduce work efficiency.

Therefore, as shown in FIG. 7, the operating tool 22 provided on the post portion of the handle 11 can be switched between the ascending position U and the descending position D on the basis of the neutral position N, and for maintaining the respective operations. In addition to being mechanically held, when the work device is operated and held in the rising position U, the working device is lifted for the held time, and the lifting operation is stopped by returning the operation tool 22 to the neutral position N, and the reverse operation is performed. When the operation tool 22 is operated and held in the descending position D, the work device descends for the held time, and the control operation is set so that the descending operation is stopped by returning the operation tool to the neutral position N. It is also possible to improve the work efficiency by setting the rising height of the work device to be low. However, in such a configuration, when the working device is lowered and stopped, it is necessary to return the operating tool 22 to the neutral position N after the working device reaches the working height, and there is room for improvement.

An object of the present invention is to reasonably construct a riding work machine which can set an ascending height of a working device arbitrarily and can easily perform an operation when descending the working device to improve working efficiency. It is in.

[0007]

A feature of the present invention is that a working device is connected to a traveling machine body so that it can be moved up and down by driving an actuator, and an operating tool is operated to a raised position with reference to a neutral position. It is equipped with a control device that starts the ascending of the device and operates the operating tool to a descending position formed on the opposite side of the ascending position with respect to the neutral position, and starts the descending of the working device. It is equipped with a holding mechanism that holds the position when it is operated to the position and when it is operated to the ascending position, and when the operating force is released after operating the operating tool to the lowered position, the operating tool is neutralized. It is equipped with an urging mechanism for restoring the position, and when the operating tool held in the raised position by the holding mechanism is manually operated to the neutral position, the operation stopping means for stopping the raising operation of the working device and the lowered position are operated. After
The present invention is provided with an operation continuation means for continuing the descending operation of the working device and stopping it at the working height even when the biasing means restores the neutral position, and its operation is as follows.

[Operation] According to the above feature, when the operating tool is operated to the ascending position, the operating tool is held at the ascending position, and the ascending operation of the working device is continuously performed. When the operating tool is operated to the neutral position during the operation, the operation stopping means stops the raising operation of the working device. Further, when the operating tool is operated to the lowered position, the lowering of the working device is started and at the same time the operating tool is restored to the neutral position by releasing the operation of the operating tool, but the operation continuing means lowers the working device. Will continue until it descends to the working height and stops.

In other words, according to the present invention, when the work implement is started to be lifted, the work implement can be stopped from rising at an arbitrary height, and when the work implement is lowered, the work implement is lowered. After operating to the lowered position, the working device can be lowered to the working height and automatically stopped without manually operating to the neutral position.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a drive-type front wheel 1 and a drive-type rear wheel 2 that are steered.
An engine 4 is mounted on the front part of a traveling machine body 3 including a vehicle, and a hydrostatic stepless transmission 5 for transmitting power from the engine 4 and a mission case 6 are arranged on the rear part of the traveling machine body 3. Also, a driver's seat 7 is arranged in the center of the traveling machine body 3, and a seedling planting device as a working device is provided through a link mechanism 9 driven and moved up and down by a hydraulic cylinder 8 as an actuator with respect to the rear end of the traveling machine body 3. A is connected to form a rice transplanter as an example of a riding work machine.

On the right side of the driver's seat 7, there is provided an elevator lever 10 for controlling the raising and lowering of the seedling planting device A and the on / off operation of the planting clutch C, and the left side of the steering handle 11 in front of the driver's seat 7. A main shift lever 12 for shifting the continuously variable transmission 5 is provided in the section, and a sub shift lever 13 for shifting the gear shift system inside the mission case 6 is provided on the left side of the driver's seat 7. The planting clutch C is built in the mission case 6, and is in an on state in which power is transmitted from the mission case 6 to the seedling planting apparatus A via the transmission shaft 14 and in a disconnected state in which power is shut off. It is configured to be switchable.

The seedling planting device A is a seedling mount 15 on which a mat-shaped seedling W is placed, a transmission case 16 to which power from the transmission shaft 14 is transmitted, and power transmitted from the transmission case 16 via a chain case 17. The rotary case 18 that rotates in the direction of 1, the planting arms 19 provided in pairs in the rotary case 18, and the plurality of ground leveling floats 20 are provided for multiple-row planting. Further, line markers 21 are provided on both left and right sides of the front part of the traveling machine body 3 so as to be switchable between a working posture in which the user lies in a field scene and a non-working posture in which the crane is lifted upward.

As shown in FIG. 2, a switching lever 22 as an operating tool is provided on the right side surface of the post portion of the steering handle 11, and the switching lever 22 has a neutral position N in a substantially horizontal posture and this. It can be freely operated to the rising position U with its end part displaced upward with reference to the neutral position N.
In addition, it is configured to be held at the neutral position N and the raised position U, is swingable to the lowered position D in a posture in which its end is displaced downward, and is neutral when the operating force is released. It is configured to restore to position N. Specifically, as shown in FIG. 4, a base end portion of the switching lever 22 is swingably supported around a support shaft 23 in a front-back direction, and a cam body 24 is integrally formed on the base end portion. Recess 24 of cam body 24
The first engaging piece 25, which is biased by a spring so as to maintain the attitude of the switching lever 22 by being engaged with the switching lever 22 in the neutral position N with respect to A, and the switching lever 22 in the raised position U. And a second engaging piece 26 that is biased by a spring so as to hold the posture of the switching lever 22 in the state of
When the switching lever 22 is operated to the lowered position D and the operating force is released, the compression type first spring 27 for restoring the neutral position N by applying the urging force to the switching lever 22 and the switching lever 22 are raised. When the second engaging piece 26 and the cam body 24 are disengaged from the position U by operating in the neutral direction, the cam body 2
4 is provided with a compression type second spring 28 that restores the neutral position N by applying an urging force, and the switching lever 22 exhibits the above-described operation form. The cam body 24 and the first and second engagement pieces 25 and 26 constitute a holding mechanism E,
The second spring 28 constitutes the urging mechanism F.

Further, the meter panel 29 is provided with a potentiometer-type sensitivity setting device 31 which is operated by a dial 30 so as to determine the control sensitivity of the automatic raising / lowering control for raising and lowering the seedling planting apparatus A in a field scene. . Further, the plurality of leveling floats 20 are swingably supported around a lateral axis formed at a rear position, and a float for measuring the rocking posture around the axis of the central position in the left-right direction among them. A sensor 32 is provided (see FIG. 5, the specific structure is not described in detail), and the automatic raising / lowering control is performed so that the feedback signal from the float sensor 32 is maintained at the value set by the sensitivity setting unit 31. The attachment device A is moved up and down.

The elevating lever 10 is configured to operate along a path formed in the guide 33 as shown in FIG.
When the elevating lever 10 is set to the front side of the "down" position in the path, the seedling planting device A is lowered, and when it is set to the rear side of the "up" position, the seedling planting device A is raised to "neutral".
When set to the position, the seedling planting device A is linked to the control system so as to maintain the level, and when the elevating lever 10 is set to the “ON” position, the planting clutch C is engaged and operated.
Automatic elevation control is performed to maintain a predetermined height against the field in a state where the ground leveling float 20 provided in the seedling planting device A is in contact with the ground, and when set to the "OFF" position, the planting clutch C is disengaged, and When the raising / lowering lever 10 is set to the "automatic" position, the raising / lowering of the seedling planting device A is allowed according to the operation of the switching lever 22 and at the same time, the planting clutch C is automatically disengaged when the seedling planting device A is raised. enable.

As shown in FIG. 5, a control system is constructed. In this control system, a potentiometer type lever sensor 35 for measuring the operation position of the elevating lever 10 with respect to a control device 34 having a microprocessor, and the switching lever. 22
Changeover switch 36 for detecting that the switch has been operated to the upper operation position U or the lower operation position D, and a potentiometer type link provided at the base end of the link mechanism 9 for measuring the height of the seedling planting apparatus A against the body. An input system for inputting signals from each of the sensor 37, the control sensitivity setting unit 31, and the float sensor 32 is formed, and an output system for an electromagnetic valve 38 for controlling the hydraulic cylinder 8 is provided, and the switching lever 22 is provided. The forced raising / lowering control operation of the seedling planting apparatus A by operation will be described below.

As shown in FIG. 6, in this control system, when the switching lever 22 is operated to the raising position U while the elevating lever 10 is set to the "automatic" position, the control device 34 is operated.
Operates the solenoid valve 38 to the raised position to drive the hydraulic cylinder 8 to start the raising operation of the seedling planting apparatus A (# 101-).
# 103 step). It should be noted that when the planting clutch C is in the engaged state at the time of this ascent, the disengagement operation is performed. Further, although the switching lever 22 is held at the raised position U during this raising operation, if the switching lever 22 continues to be held at the raised position U, the seedling planting device A is set to the upper limit based on the signal from the link sensor 37. Continue rising until it is detected that
When the upper limit is reached, the control device 34 operates the solenoid valve 38 to the neutral position to stop the ascending operation, and when the switching lever 22 is restored to the neutral position N during this ascending operation, the control device 34 operates. , The solenoid valve 38 at the operated timing
To the neutral position to stop the ascending operation (# 104-
# 106 step).

When the switching lever 22 is operated to the lowered position D in step # 102, the control device 34 controls the solenoid valve 38.
To the descending position to start the descending operation of the seedling planting apparatus A, and to output the signal from the control sensitivity setting device 31 and the float sensor 32.
The descent operation is continued up to the working height at which the automatic raising / lowering control is performed based on the signal from, and when this working height is reached, the solenoid valve 38 is operated to the neutral position to stop the descent operation (# 10).
7, Step # 108).

Further, in this control system, the descending speed of the seedling planting apparatus A by operating the switching lever 22 to the descending position D is set to be higher than the descending speed of the seedling planting apparatus A by the automatic lifting control. For example, even when the seedling planting apparatus A is kept in the state of automatic lifting control for the purpose of improving work efficiency and work is continued in a field at a position beyond the ridge, the traveling machine body 3 is started at the start of the ridge crossing. When the traveling machine body 3 enters the next field and the seedling planting device A is lowered while the front part of the plant is lifted and the seedling planting device A is raised by the automatic lifting control, the switching lever 22 is operated to the lowered position D. As a result, the planting apparatus A can be quickly lowered to the working height to start the work.

When the switching lever 22 is operated to the lowered position D, the switching lever 22 is released by releasing the operation.
Although the control device 34 is restored to the neutral position N, the control device 34 is lowered to the working height, and thereafter, the control device 34 automatically raises and lowers the seedling planting device A by the automatic raising / lowering control. In this control, the operation continuing means G is constituted by steps # 104 and # 106, and the operation continuing means H is constituted by step # 108. Further, in the state where the seedling planting apparatus A is lowered to the working height in this way, the switching lever 22 is
The operation mode is set so that the planted clutch C is engaged and operated by operating the lowered position D again.

Further, when the raising operation of the seedling planting apparatus A is raised by operating the switching lever 22 to the raised position U and then the raising operation is stopped at an arbitrary height, the switching lever 22 is moved to the lowered position D. By operating, the height of the seedling planting device A
Can be lowered to the working height.

As described above, in the present invention, when raising the seedling planting apparatus A, it is possible to raise it to the upper limit simply by operating and holding the switching lever 22 at the raising position U, and When the switching lever 22 is restored to the neutral position N during this raising operation, the raising operation is stopped and the seedling planting apparatus A is maintained at that height. When lowering A, the switching lever 22 is returned to the neutral position N by operating the switching lever 22 to the lowering position D and releasing the operating force.
Will be lowered to the working height, and the work can be performed immediately.

[Other Embodiments] The present invention is not limited to the above-described embodiment, but the holding mechanism and the biasing mechanism of the operating tool are not limited to the structures of the above-mentioned embodiments, and the switching lever is operated to the lowered position. After lowering the seedling planting device to the working height, the switching lever can be linked to the control system of the planting clutch so as to operate the position of the planting clutch by operating the switching lever to the lowered position. Moreover, it is also possible to apply to the working machine which connected the traveling machine body with the seeding apparatus which seed | inoculates a seed in the field instead of the seedling planting apparatus.

[0024]

Therefore, the rising height of the working device can be arbitrarily set, and when the working device is lowered, the working device is lowered to the working height by a simple operation and the lowering operation is automatically stopped to improve the working efficiency. The work implement that can be improved was reasonably constructed.

It should be noted that reference numerals are given in the claims for convenience of 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]

[Figure 1] Overall side view of rice transplanter

FIG. 2 is a side view showing an operation form of a switching lever.

FIG. 3 is a plan view of an operation path of a lifting lever.

FIG. 4 is a schematic sectional view of a base end portion of a switching lever.

FIG. 5 is a block circuit diagram of a control system.

FIG. 6 is a flowchart of control operation

FIG. 7 is a side view showing an operation mode of a switching lever of a comparative example.

[Explanation of symbols]

 3 Traveling machine body 8 Actuator 22 Control tool 34 Control device A Working device E Holding mechanism F Energizing mechanism G Operation stop means H Operation continuation means U Raising position D Lowering position N Neutral position

Claims (1)

[Claims] 1. A working device (A) is connected to a traveling machine body (3) so as to be movable up and down by driving an actuator (8), and an operating tool (22) is raised to a neutral position (N). The work device (A) is started to be lifted by operating U), and the operating tool (22) is moved to a lower position (D) formed on the opposite side of the upper position (U) with respect to the neutral position (N). ) Is provided with a control device (34) for starting the lowering of the working device (A), and when the operating tool (22) is operated to the neutral position (N) and to the raised position (U). When the operating force is released after the operating mechanism (22) is operated to the lowered position (D), the operating mechanism (22) is neutralized. The urging mechanism (F) for restoring operation is provided at the position (N), and the holding mechanism (E) holds the urging mechanism at the raised position (U). When the operation tool (22) is manually operated to the neutral position (N), the operation stopping means (G) for stopping the ascending operation of the working device (A) and the urging force after being operated to the descending position (D) A riding work machine provided with an operation continuation means (H) for continuing the descending operation of the working device (A) and stopping at the working height even when the mechanism (F) is restored to the neutral position (N).