JPH0542246B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention maintains a working device such as a planting device at a set height level with respect to the mud surface regardless of changes in the depth of the plow. This invention relates to a walking type paddy field working machine such as a lame type rice transplanter. Specifically, a working device and a control handle are attached to the rear side of a traveling machine that is equipped with wheels for running the plowing platform on the left and right sides that can be raised and lowered, and the traveling machine is grounded on the mud surface with a set pressure. A grounding float that moves up and down in response to variations in the height of the working device relative to the mud surface, and a grounding float that touches the mud surface at the left and right ground contact parts, and as the traveling body rolls, the floating float moves forward and backward with respect to the traveling body around the axis. a lifting device that raises and lowers the wheels in conjunction with the vertical movement of the ground float so that the height of the working device relative to the mud reaches a set level; and the rolling detection sensor. The present invention relates to a walking type paddy field working machine, which is provided with a rolling device that raises and lowers the wheels in conjunction with the rocking motion of the working device so that the rolling posture of the working device with respect to the mud surface becomes a set posture.

[Conventional technology]

The walking-type paddy field work machine described above has a ground float for leveling the ground and a sensor for rolling detection, so for example, the ground float for leveling the ground can be attached so that it can roll freely, and the rolling operation of the ground float can be detected. This method is advantageous in that rolling of the working device supported by the float is less likely to occur, and there is less mud pushing by the float, compared to the case where rolling control is performed using the float.

In other words, when a grounding float for leveling the ground is installed so that it can roll freely and the rolling operation of the grounding float is detected and rolling control is performed, the resistance to the rolling operation due to the left and right tension of the grounding float body is reduced. As a result, rolling is likely to occur in the work equipment supported by the ground float.

Furthermore, in order to obtain the desired valve operating force through the rolling action, the ground float must be formed with a wide left and right width, which is disadvantageous in that it causes a lot of mud pushing.

For this reason, originally, as shown in Japanese Patent Publication No. 61-7288, a grounding float that can only swing up and down around the horizontal axis was used, and a rolling detection sensor was separately installed. It was designed to suppress mud pushing by the ground float.

[Problem that the invention seeks to solve]

Although it is advantageous in that the grounding float and the rolling detection sensor are provided separately as in the conventional example above in that it can suppress mud pushing by the grounding float, the rolling detection sensor is designed to prevent mud pushing by the grounding float. Since the area is small, if there is a large difference in the hardness or softness of the mud, the rolling performance will deteriorate.

In addition, in automatically adjusting the ground pressure setting of the ground float according to the hardness and softness of the mud,
For those with a structure equipped with a dedicated hardness detection sensor,
This has the disadvantage of increasing costs due to an increase in the number of parts.

SUMMARY OF THE INVENTION An object of the present invention is to automatically adjust the set ground pressure of a ground float according to the hardness or softness of mud without increasing costs.

[Means for solving problems]

The characteristic configuration of the walking type paddy field work machine according to the present invention is as follows:
The left and right grounding portions of the rolling detection sensor are provided so as to be able to swing up and down together around the left and right axis,
The ground pressure automatic adjustment means is provided to reduce the set ground pressure of the ground leveling float as both ground contact portions of the rolling detection sensor swing downward as a unit. The effects and effects thereof are as follows.

[Effect]

Since the rolling detection sensor can not only roll but also swing up and down around the left and right axis, the softer the mud surface, the more the two contact parts penetrate below the mud surface, and the rolling detection sensor The amount of downward swinging around the left-right axis increases. The rocking posture of the rolling detection sensor about the left-right axis corresponds to the hardness and softness of the mud surface, and the rolling detection sensor acts as a mud surface hardness detection sensor. The rolling detection sensor is used as a mud surface hardness detection sensor, and the ground pressure automatic adjustment means decreases the set ground pressure of the ground float as the rolling detection sensor swings downward. By setting the ground pressure according to the hardness of the mud surface, it is possible to prevent pitching and mud pushing due to ground floats.

〔Effect of the invention〕

Therefore, the present invention reliably prevents work defects caused by pitting and mud pushing by ground floats, regardless of the hardness or softness of the mud, by a simple and economical means that effectively utilizes a rolling detection sensor. Now I can do it.

〔Example〕

Next, examples of the present invention will be shown.

As shown in FIG. 3, a planting device 3 as a working device and a control handle 4 are attached to the rear side of a traveling machine body 2 equipped with wheels 1 for driving the plowing platform on the left and right sides, which can swing up and down. A power unit 5 including an engine 5A is attached to the front side of the traveling body 2,
In addition, a grounding float 6 that swings up and down according to the variation in the height of the planting device 3 relative to the mud is attached to the planting device 3, thereby constructing a walking rice transplanter which is an example of a paddy field working device. .

The left and right wheels 1 are as shown in FIG.
Each is attached to the traveling body 2 via a support frame 1A which also serves as a transmission case and can swing up and down. By interlocking and connecting the corresponding parts with each other with rods 8, they are configured to swing up and down as a unit as the frame 7 moves back and forth.

The float 6 is configured to have a length that almost reaches the front end of the traveling body 2.

In addition, the walking type rice transplanter moves the planting device 3 with an automatic lifting device 9 and a traveling machine so that the height of the planting device 3 relative to the mud reaches a set level in conjunction with the up-and-down movement of the float 6. 2, that is, a rolling detection sensor 10 that detects the rolling attitude of the planting device 3 with respect to the mud surface, a rolling device 11 that controls the traveling body 2 to the set rolling based on the detected attitude of the rolling detection sensor 10, and the The ground pressure automatic adjustment means 12 is provided to automatically adjust the ground pressure of the float 6 according to the hardness or softness of the mud surface.

The lifting device 9 uses a hydraulic cylinder 9A as an actuator to move the frame 7 back and forth,
By lowering the wheels 1 relative to the traveling body 2, the planting device 3 is reversibly raised together with the traveling body 2. The rotary control valve 9B for the hydraulic cylinder 9A is a first
As shown in the figure, the attitude of the float 6 relative to the planting apparatus when the planting apparatus 3 is at the set level is set as the setting attitude, and when the float 6 is swung to the set attitude, the control valve 9B is activated to stop the elevation. When the control valve 9B is in the neutral position and the float 6 is in a swinging position above the set position, the control valve 9B is in the planting device raised position, and when the float 6 is swinging below the set position, the control valve 9B The valve 9B is interlocked near the front end of the float 6 via a rod 9a and a relay ring 9b so that the planting device is located in the lowered position.

As shown in FIGS. 1 and 2, the rolling detection sensor 10 has a structure in which a float-like grounding portion 10B that makes contact with a mud surface is attached to each of the left and right ends of a horizontal rod 10A that faces left and right. The left and right ground contact portions 10B are provided at the front part of the traveling body 2 so as to be swingable about the longitudinal axis a so that the left and right ground contact portions 10B move up and down in a contralateral manner.
Left and right axis center b so that B moves up and down integrally
It is attached so that it can swing freely. Even if the traveling aircraft 2 rolls, the left and right ground contact parts 10
By keeping the mud surface posture constant around the longitudinal axis a on the mud surface B, as the traveling aircraft 2 rolls, the movement around the longitudinal axis a with respect to the traveling aircraft 2 It is configured to swing relative to each other and detect the amount of rolling of the traveling body 2 based on the amount of relative swing. To explain in detail the attachment means to the traveling body 2, a bracket 10C that can swing freely around the longitudinal axis a is attached to the traveling body 2, and the horizontal rod 10 is attached to this bracket 10C.
Position A on the left-right axis b and its horizontal rod 10
This is a means for attaching the left and right center portions of A so as to be rotatable around the left and right axis b.

The rolling device 11 includes a hydraulic cylinder 11
By using A as an actuator, the frame 7 is swung around the vertical axis X using its left and right center portions as fulcrums, thereby raising and lowering the left and right wheels 1 in a contradistinct manner and rolling the traveling body 2. By interlocking the rotary control valve 11B for the hydraulic cylinder 11A with the rolling detection sensor 10, the rolling attitude of the traveling body 2 with respect to the mud surface is maintained at the set attitude. The means for interlocking the control valve 11B with the rolling detection sensor 10 engages with an engaging member 10a connected to the bracket 10C so as to move the control valve 11B upward and downward in response to the swinging of the rolling detection sensor 10 about the longitudinal axis a. A first link 11a that swings around the axis _a1 , a second link 11c that swings about the vertical axis _a2 by interlocking the first link 11a via a rod 11b, and this second link. A third link 11d is provided to rotate the spool of the control valve 11B by swinging around the longitudinal axis _a3 in conjunction with the third link 11c, so that when the traveling body 2 is in the set attitude, the control valve 1
1B is located in the neutral position, and when the traveling body 2 rolls downward to the left, the control valve 11B is positioned at the right rolling position where the left wheel 1 is lowered, and when the traveling body 2 rolls downward to the right, the right wheel 1 The control valve 11B is configured to be positioned at a left rolling position where the control valve 11B is lowered.

The ground pressure automatic adjustment means 12 fixes the other end of a tension spring 12A for ground pressure setting, which rests at one end of the relay link 9b of the lifting device 9 and urges the float downward in FIG. A link 12B is provided which changes the strength of the tension spring 12A by swinging, and this link 12B and the rolling detection sensor 10
The arm 10b fixed to the horizontal rod 10A is provided with a rod 12C that reversibly links the arm 10b so that the more the grounding part 10B swings upward, the greater the tension of the tension spring 12A becomes.

Therefore, as the hardness of the mud surface becomes softer, the resistance to the downward movement of the ground contact part 10B by the mud surface becomes smaller, and the ground contact part 10B moves downward, resulting in the setting by the tension spring 12A. Since the ground pressure is reduced, the amount of sinking of the float 6 below the mud surface is reduced.

According to the walk-behind rice transplanter having the above configuration, the ground pressure adjustment of the float 6 according to the hardness and softness of the mud surface and the rolling attitude adjustment of the traveling body 2, that is, the planting device 3, are performed based on the rolling detection sensor 10. done automatically. Moreover, since the rolling detection sensor 10 is disposed at the front of the traveling body 2, when turning at the edge of the field, the rear part of the traveling body 2, that is, when the planting device 3 is lifted, As a result, the front part of the traveling body 2 moves downward, and as a result, the rolling detection sensor 10 relatively swings downward, the set ground pressure becomes smaller, and the amount of sinking of the float 6 decreases. As a result, it is possible to prevent the float 6 from pushing mud when turning while leveling the mud surface with the front end of the float 6.

[Brief explanation of drawings]

The drawings show an embodiment of the walking type paddy field working machine according to the present invention, in which FIG. 1 is a perspective view of the main part, FIG. 2 is a front view of the main part, and FIG. 3 is an overall side view. 1...Wheels, 2...Traveling body, 3...Working device, 4...Control handle, 6...Grounding body, 10B
...Grounding part, 10...Rolling detection sensor, 9
...Lifting device, 11...Rolling device, 12...
... Ground pressure automatic adjustment means.

Claims (1)

[Claims] 1. A working device 3 and a control handle 4 are attached to the rear side of a traveling body 2 equipped with wheels 1 for traveling the plowing machine that can be raised and lowered on the left and right sides, and the said traveling body 2
There is a grounding float 6 that touches the mud surface with a set pressure and moves up and down in response to variations in the height of the work device 3 relative to the mud surface, and a traveling body 2 that touches the mud surface with the left and right grounding parts 10B. A rolling detection sensor 10 is attached to the traveling body 2 that swings around an axis a in the longitudinal direction as the ground float 6 rolls. a lifting device 9 that lifts and lowers the wheel 1 so that the height reaches a set level; and a rolling detection sensor 1;
A traveling paddy field working machine is provided with a rolling device 11 that raises and lowers the wheels 1 in conjunction with the rocking motion of the working device 3 so that the rolling posture of the working device 3 with respect to the mud surface becomes a set posture, the rolling device 11 The left and right grounding parts 10B of the detection sensor 10 are aligned with the left and right axis b.
Ground pressure automatic adjustment means 12 is provided so as to be able to integrally swing up and down around the rolling detection sensor 10, and to reduce the set ground pressure of the ground float 6 as both ground contact parts 10B of the rolling detection sensor 10 swing downward together. A walking type paddy field work machine.