JPH0347451Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] The invention is a walking-type paddy field work machine, typified by a rice transplanter. , an automatic lift control state in which the left and right wheels moving on the plowing platform are raised and lowered independently relative to the machine body based on the detection of the sensor that detects the mud surface height on the left and right sides of the machine, and an automatic lift control state in which both wheels are raised and lowered together. The present invention relates to a walking type paddy field work machine that can be freely switched between a stopped state and a forced lowering state in which both wheels are lowered.

[Conventional technology]

In such a conventional walking type paddy field work machine, when the lowering state is operated, both wheels are simultaneously lowered from the upper and lower positions relative to the machine body at the time of the switching operation.

[Problem that the invention attempts to solve]

However, when using the above-mentioned conventional walk-behind paddy field work machine, the vertical positions of both wheels relative to the machine body at the time of the switching operation are the positions determined by the automatic lifting control immediately before the switching operation, and the positions vary widely, and both wheels are lowered. At this time, the left and right attitude of the aircraft is parallel to the mud surface, but it is not horizontal, so when lowering both wheels and turning on the headland, the heights of the left and right digging parts of the control handle are different, and as a result, the control becomes difficult. The drawback was that it was difficult to turn by operating the steering wheel.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

[Means for Solving the Problems] The characteristic configuration of the walking type paddy field work machine according to the present invention, which was taken to achieve the above object, is that a sensor is provided to detect the left and right inclination of the machine body with respect to the horizontal, and when the machine body is in the forced downward state, When the switching operation is performed, a means is provided to lower both wheels and raise and lower the wheels so that the left and right attitude of the aircraft body becomes horizontal.The operation and effect thereof are as follows.

[Effect]

When switching to the descending state, the automatic lift control immediately before the switch lowers both wheels and raises and lowers the wheels so that the aircraft's left and right posture is horizontal, regardless of the vertical position of both wheels relative to the aircraft. Therefore, in the descending state, the horizontal attitude of the aircraft can be made horizontal.

[Effect of idea]

Therefore, according to the present invention, in the automatic elevation control state, both wheels are automatically raised and lowered independently, so that the left and right attitude of the machine is kept parallel to the mud surface regardless of changes in the plowing depth on the left and right sides. When turning on a headland with both wheels lowered, the walk-behind paddy field work machine can be used to keep the left and right posture of the machine horizontal and make the turn easier. We are now able to provide it.

〔Example〕

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

As shown in Fig. 2, a walking rice transplanter, which is an example of a walking rice paddy work machine, has a prime mover 2 at the front of a frame 1 facing forward and backward, and a planting device 3 and a control handle 4 at the rear. Two left and right wheels 5 that move on the tiller a are attached to the machine body.
L and 5R are installed, and ground-based sensors SL and SR are installed to detect the height of the mud surface on the left and right sides of the aircraft.

As shown in FIG. 3, the two wheels 5L, 5R are independently swung up and down by hydraulic cylinders 7L, 7R, respectively.

The sensors SL and SR are urged to move downward by springs, and when the height of the mud surface becomes higher than a set value, the sensors SL and SR are displaced downward with respect to the aircraft body due to their weight and the urging force of the spring. turns on the lowering switches S _DL and S _DR , and when the height to the mud surface becomes lower than the set value, the ground reaction force causes the aircraft to displace upward relative to the aircraft and turns on the lowering switches S _UL and S _UR.
This turns on the .

Reference numeral 9 denotes a lift operation lever that can _be swiveled to switch between automatic lift position P _A , neutral position _{P N} , and forced lowering position P _D. This is the first switch for detecting the lever position, which is turned on when the lever is in the lowered position P _D and turned off when it is in the neutral position P _N. S _W2 is the first switch for detecting the lever position that is turned on when the lift lever 9 is in the forced lower position P _D. This is the second switch for lever position detection that is turned ON. S is a horizontal sensor that uses a pendulum 6 to detect the left and right attitude of the aircraft relative to the horizontal. It is equipped with a left switch S _WL that is turned on, and a right switch S _WR that is turned on when the left and right attitude of the aircraft is in a horizontal attitude and in a right tilted attitude where the right side is lower than the left side with respect to the horizontal.

Three-position switching solenoid valves 12L and 1 control expansion and contraction of both hydraulic cylinders 7L and 7R, respectively.
The control circuit of 2R controls the sensor so that the height relative to the mud on the left and right sides of the aircraft reaches the set value by operating the lift control lever 9 to the automatic lift position P _A.
Based on the detection of SL and SR, both wheels 5L and 5R
The state switches to an automatic elevation control state in which the wheels 5L and 5R are raised and lowered independently, and by moving the elevation operation lever 9 to the neutral position _P By operating the machine to the forced lowering position P _D , the wheel 5L or 5R on the side where the aircraft is tilted is lowered to level the left and right attitude of the aircraft, and then both wheels 5L and 5R are lowered to the descending state. It is configured to switch, and specifically, it is configured as follows.

In other words, as shown in FIG. 1, the control circuit controls the sensors SL and SR when the lift operation lever 9 is moved to the automatic lift position P _A and the first switch S _W1 for lever position detection is ON. By turning on the lowering switches S _DL and S _DR , the solenoid valve 12
L and 12R are operated to the lower position, while the lift switches S _UL and S _UR are turned on, so that the solenoid valves 12L and 12R are operated to the upper position, and the lift operation lever 9 is set to the neutral position. By moving to position P _N and turning off the first lever position detection switch S _W1 , solenoid valve 1
It is configured to move 2L and 12R to a neutral position where they stop moving up and down. In addition, the control circuit operates the relay R when the lift operation lever 9 is moved to the forced lowering position P _D and the second lever position detection switch S _W2 is turned on, and the normally closed contact of this relay R is activated. By turning OFF r ₂ , even if the lift switches S _UL and S _UR are ON, the solenoid valves 12L and 1
While preventing the operation of 2R to the raised position, the normally open contact _r1 of relay R is turned on, and the switches S _WL and S _WR of the horizontal sensor S are turned on, so that the lowering switches S _DL and S are turned on. It is configured to operate the solenoid valves 12L and 12R to the lowered position regardless of whether _DR is OFF.

Therefore, the lift operation lever 9 is moved to the automatic lift position P _A
If the machine is operated and switched to the automatic lifting state, the left and right attitude of the machine is not parallel to the mud surface 6 due to changes in the plowing depth on the left and right sides, and the mud surface height on the left and right sides of the machine is not parallel to the mud surface 6. When the temperature exceeds the set value, the appropriate lifting/lowering switches S _DL , S _DR , S _UL , and S _UR are activated.
Turn on the wheels 5L and 5R to raise and lower the switch.
S _DL , S _DR , S _UL , and S _UR are all raised and lowered until they are turned off, and as a result, the left and right attitude of the aircraft is maintained at a position that sets the mud surface height on both sides of the aircraft to the set value. In addition, when the lifting operation lever 9 is operated and moved to the neutral position P _N to switch to the lifting stop state,
Regardless of whether the lift switches S _DL , S _DR , S _UL , and S _UR are ON, the first switch for lever position detection S _W1
When the solenoid valves 12L and 12R are turned off, the operation of the solenoid valves 12L and 12R is prevented, thereby stopping the lifting and lowering of both wheels 5L and 5R. In addition, when the elevator control lever 9 is moved to the forced lowering position P _D to switch to the lowering state, if the left and right attitude of the aircraft is horizontal at the time of switching, both the left and right switches S _WL and S _WR are Since the normally open contact r ₁ turns on when switching, both wheels 5L and 5R descend simultaneously. Since only the left and right switch (S _WL or S _WR ) on the side is ON, only the lower wheel 5L or 5R is lowered by turning on the normally closed contact r ₁ associated with switching, and thereby, When the left and right attitude of the aircraft becomes horizontal and the other left and right switch (S _WR or S _WL ) is turned on, the other wheel 5R or 5L also begins to descend.

According to the above configuration, when switching to the descending state and making a turn on the headland, the wheels 5L and 5R are lowered so that the left and right attitude of the aircraft is horizontal, and then both wheels 5L and 5R are lowered. , wheels 5L, 5R
In the lowered state, the left and right attitude of the aircraft becomes horizontal, making it easy to make turns using the control handle 4.

[Another example]

As shown in FIG. 5, in the above embodiment, a second relay R' is provided which operates for a set time via a timer T when the second lever position detection switch S _W2 is turned on. When the normally open contact r ₁ ' of the relay R' is turned on, both the solenoid valves 12L and 12R are operated to the lowered position regardless of whether the left and right switches S _WL and S _WR of the horizontal sensor S are turned off. In this case, when the aircraft is switched to the descending state, both wheels 5L and 5R are lowered simultaneously for a set time, and then the wheels 5L and 5R are lowered so that the left and right attitude of the aircraft is horizontal. .

[Brief explanation of drawings]

1 to 4 show an embodiment of the walking type paddy field work machine according to the present invention, in which FIG. 1 is a control circuit diagram, FIG. 2 is a side view, FIG. 3 is a schematic perspective view of the main parts, and FIG. 4
The figure is a schematic configuration diagram of the main part (horizontal sensor), and FIG. 5 is a control circuit diagram showing another embodiment. SL, SL...Sensor, 5L, 5R...Wheel, S
...Sensor.

Claims (1)

[Scope of claim for utility model registration] A sensor that detects the height of the mud surface on the left and right sides of the aircraft so that the height of the mud surface on the left and right sides of the aircraft is maintained at the set value.
Based on the detection of SL and SR, the left and right wheels 5L and 5R moving on the tiller a are raised and lowered independently with respect to the machine body, and the two wheels 5 are automatically raised and lowered.
In a walk-behind paddy field working machine configured to be able to switch freely between a state in which both wheels L and 5R are lifted and stopped, and a forced descending state in which both wheels 5L and 5R are lowered, the left and right inclination of the machine body relative to the horizontal is detected. A walking type device equipped with a sensor S and means for lowering both wheels 5L and 5R when the forced lowering state is switched, and also raising and lowering the wheels 5L and 5R so that the left and right posture of the aircraft is horizontal. Paddy field work machine. The claimed scope of the utility model registration is that when the forced lowering state is operated, one wheel is lowered so that the left and right attitude of the aircraft becomes horizontal, and then both wheels 5L and 5R are lowered at the same time. The walking-type paddy field work machine described in paragraph 1. When the forced lowering state is operated, both wheels 5L and 5R are lowered at the same time, and then the wheels are lowered so that the left and right attitude of the aircraft becomes horizontal. Walk-behind paddy field work machine as described in section.