JPH0365126B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a walking-type paddy field working machine represented 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 seeks 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 switching operation are the positions determined by the automatic lifting control immediately before the switching, and there is a wide range of variations. The vertical position of the two wheels relative to the machine body differs depending on the situation, and as a result, when switching from the automatic lift control state to the descending state and moving from inside the field to the ridge, the machine tilts left and right, and even if it does not roll over, , the aircraft could easily become unstable.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to improve the stability of the machine when it is switched to a descending state for climbing up a ridge from inside the field.

[Means for solving problems]

The characteristic configuration of the walk-behind paddy field work machine according to the present invention, which was taken to achieve the above object, is that when the forced lowering state is operated, the wheels are raised and lowered so that they are located at the same height relative to the machine body. The point is that a means for lowering it is provided. The effects of this are as follows.

[Effect]

When switching to the descending state, the automatic lift control just before that raises and lowers both wheels to the same vertical position relative to the aircraft, regardless of their vertical position relative to the aircraft, and then lowers both wheels. The vertical position of both wheels relative to the aircraft can be made the same.

〔Effect of the invention〕

Therefore, according to the present invention, in the automatic elevation control state, by automatically raising and lowering both wheels independently, the left and right posture of the machine can be kept parallel to the mud surface regardless of changes in the plowing depth on the left and right sides. However, when lowering both wheels to move to the ridge, place both lowered wheels at the same vertical position relative to the aircraft to prevent the aircraft from tilting to the left or right. , stabilize the aircraft and move safely to the ridge.
Moreover, we have now been able to provide a walking-type paddy field work machine that is easy to operate.

〔Example〕

Embodiments of the present invention will be described below 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.
In addition to mounting sensors L and 5R, 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. and turn on the lowering switches S _DL and S _DR . 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 turn on the lowering switches S _UL ,
This turns on _SUR .

Reference numeral 9 denotes a lift operation lever that can be oscillated to switch between an automatic lift position P _A , a neutral position P _N , and a forced lowering position _PD . Both piston rods 11L, 11R are moved so as to change the posture of both hydraulic cylinders 7L, 7R with respect to piston rods 11L, 11R.
This is a telescopic rod for detecting vertical differences that hangs between the tips of the In addition, S _W1 is such that the elevating operation lever 9 is in the automatic elevating position P _A and the forced lowering position.
This is the first switch for detecting the lever position, which is turned ON when it is located at P _D and turned OFF when it is located at neutral position P _{N. SW2} is turned ON when the lifting operation lever 9 is located at forced lowering position P _D. S WL is the second switch for detecting the lever position, and S _WL is the second switch for detecting the lever position.
When the vertical position of the right wheel 5R relative to the aircraft is the same as or higher than that of the right wheel 5R, the left piston rod 1
Contact L provided on the 1L side and rod 10 for detecting vertical difference
This is the first _switch that is turned ON by contacting the contact point L' provided on the side. This is a second switch that is turned ON by bringing the contact R provided on the piston rod 11R side into contact with the contact R' provided on the vertical difference detection rod 10 side.

8-position switching solenoid valves 12L and 1 control expansion and contraction of both the 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 lift control state in which the wheels are raised and lowered independently, and by moving the lift operation lever 9 to the neutral position P _N , the state switches to a state in which both wheels 5L and 5R stop raising and lowering, and the lift operation lever 9 By operating and moving to the forced lowering position P _D , the higher wheel (5L or 5R) is lowered and both wheels 5
After making the vertical positions of L and 5R relative to the aircraft the same, the system is configured to switch to a lowering state in which both wheels 5L and 5R are lowered. Specifically, the configuration is 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 , solenoid valve 1
2L 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. The solenoid valves 12L and 12R are operated to a neutral position for stopping the lift by moving the lever to the position P _N and turning off the first switch S _W1 for detecting the lever position. And the control circuit is
The lift operation lever 9 is operated and moved to the forced lowering position P _D , and the second lever position detection switch S _W2 is activated.
By turning ON, the relay (RE) is activated,
By turning off the normally closed contact _r2 of this relay (RE), even if the lift switches S _UL and S _UR are turned on,
While preventing the solenoid valves 12L and 12R from operating to the raised position, the normally open contact _r1 of relay R is turned ON, and
When the first and second switches S _Wl and S _WR are turned on, the electromagnetic valves 12L and 12R are operated to the lowered position regardless of whether the lowering switches S _DL and S _DL are turned off.

Therefore, the lift operation lever 9 is moved to the automatic lift position P _A
If the automatic lifting state has been switched by operating the machine to When the height exceeds the set value, the lift switches 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 changes to the mud surface height on both sides of the aircraft The position is maintained so that the set value is set. In addition, when the lifting operation lever 9 is operated and moved to the neutral position _PN to switch to the lifting stop state, the lifting switches S _DL , S _DR , S _UL ,
Regardless of whether S _UR is ON or not, the first lever position detection
Solenoid valves 12L and 12R are turned off by turning off switch S _W1 .
By preventing the operation of both wheels 5L, 5
The elevation of R is stopped. In addition, move the lift control lever 9 to the forced lowering position P _D ,
When switching to the descending state, both wheels 5L at the time of switching,
If the vertical position of 5R relative to the aircraft is the same, both the first and second switches S _WL and S _WR are ON, so
When the normally open contact _r1 is turned on during switching, both wheels 5L and 5R are lowered simultaneously, and when switching, both wheels 5L and 5R are lowered.
If the vertical position of 5R relative to the aircraft is different, only the switch (S _WL or S _WR ) on the higher wheel (5L or 5R) side is ON, so the normally open contact r ₁ is turned on, the wheel 5L or 5R located high moves down, and thereby,
When the vertical positions of both wheels 5L and 5R relative to the aircraft are the same and the other switch (S _WE or S _WL ) is turned on, the other wheel (5R or 5L) starts descending.

In addition, the planting device 3 includes a seedling tray 14 that is reciprocated laterally by a spiral shaft 13, and a seedling tray 14 that is cyclically operated up and down by crank shafts 15, each of which is interlocked with the spiral shaft 13. It is equipped with eight planting claws 16 that take out seedlings in units of planting units and plant them on the mud surface, and a float 17 that levels the mud surface. ) and the planting case 18' that supports the remaining crankshaft 15 have the same structure.
The two crankshafts 15, 15 are connected to the chain 1
The remaining crankshaft 15 is driven by the chain 19, and a vertical feed claw ( (not shown)
It is driven via a chain 22 by a vertical camshaft 21 to which an arm 20 for operating is fixed.

According to the above configuration, when switching to the lowering state and leaving the field, first lower the higher wheel (5L or 5R) so that the vertical position of both the left and right wheels 5L and 5R relative to the machine body is the same. By doing this, the other wheel (5R or 5L) is also lowered from the point when the vertical positions of both wheels 5L and 5R relative to the aircraft are the same, so the height of the lowered wheels 5L and 5R relative to the aircraft is lowered. It will be the same.

[Brief explanation of drawings]

The drawings 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, FIGS. 4A and 4B are operation explanatory views, and FIG. 5 is an enlarged cross-sectional plan view of the main parts. SL, SR...Sensor, 5L, 5R...Wheel.

Claims (1)

[Claims] 1 Sensors that detect the mud surface height on the left and right sides of the aircraft to maintain the mud surface height on the left and right sides of the aircraft at the set value
Based on the detection of SL and SR, there is an automatic lifting control state in which 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 both wheels 5L and 5 are
A state in which both wheels 5L and 5 are stopped moving up and down, and both wheels 5L and 5
In a walk-behind paddy field work machine that is configured to be freely switchable between a forced lowering state in which both R and R are lowered,
The walking type paddy field working machine is provided with a means for raising and lowering the wheels 5L and 5R so that they are located at the same height relative to the machine body and then lowering them when the forced lowering state is switched to the forced lowering state.