JPH0411459Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention connects a paddy field working device to a traveling machine so that it can be freely raised and lowered by a drive mechanism, and also connects the paddy field working device 4 to a traveling machine in relation to the lifting and lowering of the traveling machine. The present invention relates to a structure for lifting and lowering a working device of a paddy field working vehicle equipped with a suspension spring.

[Conventional technology]

In the above-mentioned paddy field work vehicle, conventionally, the lowering operation by the drive mechanism of the work device is set by, for example, the shortening limit of the lifting hydraulic cylinder or a stopper acting on the link, regardless of changes in the weight of the work device. The drive mechanism can reach the stroke end of the drive system.
The following inconvenience occurred.

[Problem to be solved by the invention] In other words, when lowering the working equipment close to the ground level to facilitate inspection and repair work,
If a large amount of seedlings, fertilizers, seeds, etc. that are consumed during work remain in the working equipment, the suspension spring may sag at the end of the stroke due to the weight of this residue. If the work equipment is not lowered until the lower part of the work equipment is lowered, the equipment parts such as the ground float located at the bottom of the work equipment may collide with the ground and be deformed or damaged, or the lowest part of the equipment may be damaged. The lowering operation had to be performed carefully to avoid collision with the ground, which required a lot of adjustment work.

An object of the present invention is to allow a working device to be lowered close to the ground surface, regardless of the presence or absence of residue, easily and quickly without incurring the above-mentioned troubles.

[Means for solving problems]

The present invention is characterized in that, in the above-mentioned structure for lifting and lowering a working device for a paddy field working vehicle, the minimum height of the paddy field working device relative to the traveling body operated by the drive mechanism is set by the suspension spring. The mechanism is provided with a setting mechanism that automatically regulates the height to a predetermined height regardless of the amount of deflection, and its functions and effects are as follows.

[Effect]

The specific height is set at a height relative to the traveling machine body at which the lowest part of the working device is located close to the ground. Then, even if there is no residue on the working equipment and the suspension spring is not bent,
The minimum height to be lowered relative to the traveling aircraft by the drive mechanism is automatically set to the specific height even if there is residual material and it is bent, and regardless of the magnitude of the deflection. A mechanism regulates and automatically stops the lowered working device when it reaches the specified height.

[Effect of idea]

By automatically stopping the work equipment at the specified height, the work equipment is placed above the ground to the extent that the lowest part does not touch the ground, regardless of the presence or absence of residue on the work equipment and regardless of the weight of the residue. It is now possible to lower the workpiece to a nearby location, making inspection and repair easier, and preventing deformation or damage to the work equipment. Moreover, there is no need to adjust the drive mechanism while watching the descending work device to prevent the work device from touching the ground, and the work device can be lowered to near the ground level easily and quickly by simply operating the drive mechanism to the lowering side. This has made it possible to quickly start desired tasks such as inspections and repairs.

〔Example〕

As shown in FIG. 4, a link mechanism is installed at the rear of a wheeled self-propelled aircraft having a safety frame 1 to prevent capsizing, and is configured to swing up and down by a hydraulic cylinder 2 as an example of a drive mechanism. A seedling planting device 4 is connected to the seedling planting device 4 via a rotary shaft 3 so as to be operable up and down, and power is transmitted from the self-propelled body to the seedling planting device 4 via a rotating shaft 5, thereby forming a riding type rice transplanter.

The safety frame 1 is constructed so that it can be swung and fixed in such a manner that its extending ends from the self-propelled aircraft are located at the front and rear sides of the self-propelled aircraft, and a balance weight is provided on the extending ends of the safety frame 1. A balance weight 7 is provided with a detachable part 1a and is attached to a mounting part 6 at the front end of the self-propelled body for connecting the seedling planting device 4.
As shown by the imaginary line in FIG. 4, it is used as a balance weight mounting member to be repositioned and attached to the rear side of the self-propelled aircraft in order to use it as a balance weight when the seedling planting device 4 is removed. The safety frame 1 can be used as a transfer member for moving the balance weight 7 from one of the front side and the rear side of the machine body to the other.

As shown in FIG. 1, the cylinder tube 2a of the hydraulic cylinder 2 is rotatably connected to the frame portion 9 of the self-propelled aircraft via a connecting shaft 8, and
The piston rod 2b of the hydraulic cylinder 2 is slidably connected to a spring case 10 which is rotatably connected to the top link 3a of the link mechanism 3 about an axis P, and the suspension spring 1
1 is inserted between the spring receiving portion 12 of the piston rod 2b and the spring case 10, with the piston rod 2b being fitted onto the piston rod 2b. That is, the hydraulic cylinder 2 supports the seedling planting device 4 via the suspension spring 11 and the spring case 10, and the seedling planting device 4 accurately follows the mud surface regardless of vibrations caused by driving etc. As such, the suspension spring 11 is configured to alleviate vibrations caused by the raising and lowering of the seedling planting device 4 relative to the traveling body.

As shown in FIG. 1, an oil passage 14 is formed in the cylinder tube 2a to connect the hydraulic cylinder 2 and its control valve 13.
An on-off valve 15 is provided in a state where it is urged toward the closing side by a first spring 16. Then, the interlocking rod 18, which has one end slidably attached to the sliding operating rod 17 of the on-off valve 15, is slidably attached to the support portion 19 of the cylinder tube 2a, and is also slidably attached to the supporting portion 19 of the cylinder tube 2a. The above-mentioned on-off valve 1
A second spring 20, which has a stronger biasing force than the first spring 16, is attached to the operating lever 17 so that the opening operation of 5 can be performed, and the interlocking lever 18 contacts and biases the spring case 10.
A third spring 21 having a stronger urging force than the second spring 20 is interposed between the supporting portion 19 and the interlocking rod 18, and the spring case 10 is attached to the cylinder tube 2a. The on-off valve 15 is configured to be automatically operated by approaching and separating. That is, as shown in FIG. 1, if the spring case 10 is farther away from the cylinder tube 2a than the set distance L,
The interlocking rod 18 is slid to the top link 3a side by the third spring 21, and the operating rod 17 is operated to push into the cylinder tube 2a to open the on-off valve 15. As shown in the figure, when the spring case 10 approaches the cylinder tube 2a to the set distance L, the interlocking rod 18 is pressed toward the frame portion 9 by the spring case 10, and the operating rod 17 is opened and closed by the first spring 16. The valve 15 can be closed. Therefore, the minimum height of the vehicle relative to the vehicle that is lowered by the seedling planting device cylinder 2 is determined by the suspension spring 1, which is determined by the presence or absence of residual seedlings on the seedling platform 4 and the weight of the residual seedlings.
The setting mechanism 22 is configured to automatically regulate the height H to a specific height H regardless of the amount of deflection of the hydraulic cylinder 2 when lowering the seedling planting device 4 on flat ground. As shown in FIG. 3, the ground float at the bottom of the seedling planting device 4 can be operated simply by operating the seedling tray 23, regardless of the presence or absence of seedlings remaining on the seedling platform 23 and the amount of remaining seedlings. When the front end of the seedling planting device 24 reaches the specified height H at which it is located close to the ground, the seedling planting device descends automatically to stop.

That is, when the front end of the grounding float 24 reaches the specific height H, the distance between the spring case 10 and the cylinder tube 2a becomes the distance L, and the hydraulic cylinder 2 has a working margin for the lowering operation, that is, a shortening amount. Regardless of whether it is on or off, the on-off valve 15 is automatically closed and the shortening operation of the hydraulic cylinder 2 is stopped.

[Another Embodiment] As shown in FIG.
or
A sensor that detects the distance between the spring case 10 and the cylinder tube 2a or the angle of the top link or lower link of the link mechanism 3, and automatically operates the on-off valve 15 and control valve 13 based on information from this sensor. A configuration consisting of a control mechanism may be adopted instead of the setting mechanism 22 shown in FIG.

The present invention can also be applied to a paddy field working vehicle that performs various operations such as fertilization and sowing in addition to planting seedlings, and the seedling planting device 4 is referred to as a paddy field working device 4.

[Brief explanation of the drawing]

The drawings show an embodiment of the structure for lifting and lowering the working device of a paddy field working vehicle according to the present invention, in which FIG. 1 is a cross-sectional view of the lift cylinder, FIG. 2 is a cross-sectional view of the lift cylinder when the lowering operation is stopped, and FIG. The figure is an explanatory diagram showing the lowest position of the seedling planting device, FIG. 4 is a side view of the entire riding-type rice transplanter, and FIG. 5 is a partially cutaway plan view of another implementation setting mechanism. 2... Drive mechanism, 4... Paddy field working device, 11
...Suspension spring, 22...Setting mechanism, H...Specific height.

Claims (1)

[Scope of utility model registration request] The paddy field working device 4 is connected to the traveling machine so that it can be freely raised and lowered by the drive mechanism 2, and a suspension spring 11 is provided for raising and lowering the paddy field working device 4 relative to the traveling machine. The structure is such that the minimum height of the paddy field working device 4 relative to the traveling machine operated by the drive mechanism 2 is determined by the suspension spring 11.
A working device lifting/lowering operation structure for a paddy field working vehicle is provided with a setting mechanism 22 that automatically regulates the height H to a predetermined height regardless of the amount of deflection.