JPH07102018B2 - Lifting control device for riding farm equipment - Google Patents

Description

Description: [Industrial field of application] The present invention relates to a lifting control device for a riding-type agricultural work machine in which a working machine for a paddy field such as a rice transplanter or a seeder is mounted on a tow vehicle body through a lifting link mechanism. It is about.

[Prior art]

As a conventional technique of this kind, there is a riding type rice transplanter as disclosed in Japanese Utility Model Laid-Open No. 62-122516. In this system, a rice transplanter is attached to the rear part of the towing vehicle through an elevating link mechanism that moves up and down by a hydraulic cylinder, and the leveling float of this rice transplanter and a hydraulic control valve provided on the side of the towing vehicle are linked together. The structure is such that the ground pressure of the ground leveling float is controlled so as to be constantly kept constant, and a damper mechanism is provided between the ground leveling float and the machine frame.

[Problems to be Solved by the Invention] In the prior art, the damper mechanism is provided between the leveling float and the machine frame. Therefore, in the agricultural work machine performing work in the paddy field, the damper mechanism is It is constantly immersed in muddy water, and its operation cannot be properly performed for many years.In addition, the damper mechanism suppresses vertical movement relative to the leveling float at a position different from the part where the linking mechanism links to the leveling float. Since it is done, it is very difficult to set the suppression force, and it cannot be put to practical use.

[Means for Solving the Problems]

In order to solve the above-mentioned problems of the prior art, the present invention provides a lifting link mechanism that is lifted and lowered by a hydraulic cylinder device 17.
A control valve 19 provided on the tow vehicle body 1 by mounting a rice paddy work machine 8 such as a rice transplanter or a seeder on the tow vehicle body 1 via 14
In the riding-type agricultural work machine for switching the operation of the hydraulic cylinder device 17, a grounding body 12 is provided on the machine frame 9 of the working machine 8 which is grounded to the paddy field and the front part is vertically moved, and the grounding body 12 is fixed. A mechanism for linking the control valve 19 and the front part of the grounding body 12 so as to raise the work implement 8 with respect to upward movement from a range and, conversely, lower the work implement 8 with respect to downward movement from a certain range. twenty two
The lifting / lowering control device for a riding-type agricultural work machine is provided with a damper mechanism 32 that is connected via the link mechanism 22 and suppresses the linking operation of the linking mechanism 22 between the linking mechanism 22 and the machine body.

[Advantageous effects of the invention]

As described above, the present invention links the control valve 19 and the front portion of the grounding body 12 via the linking mechanism 22, and
Since the damper mechanism 32 that suppresses the interlocking operation of the interlocking mechanism 22 is provided between the airframe 22 and the machine body, the grounding body can be formed with small irregularities in the field.
Frequent vertical movement of 12 is suppressed by the damper mechanism 32 and the control valve 19 is not switched, and the control valve 19 is switched only when the grounding body 12 is pushed up or down for a certain period of time or more, which is stable. Lifting control of the working machine 8 is performed.

And a damper mechanism that suppresses the linkage operation of the linkage mechanism 22.
Since 32 is provided between the linkage mechanism 22 and the aircraft, the linkage mechanism 22
Can be easily set to an appropriate suppression force, and the damper mechanism 32 is inevitably located above the grounding body 12, so that the damper mechanism 32 is always immersed in mud or muddy water. In addition, the operation can be properly performed over many years, and stable lifting control of the riding-type agricultural work machine can be performed.

〔Example〕

An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a tow vehicle body, and a steering handle 3 is provided in front of an upper portion of a chassis 2 having a pair of left and right front wheels and a pair of left and right rear wheels. The structure is such that the cockpit 4 is provided on the rear of the upper part of the chassis 2 and on the upper part of the cover that covers the engine. Reference numeral 5 is a step, and 6 is a pillar projecting upward from a rear mission case 7 for driving rear wheels.

8 is a working machine, which is a rice transplanter in the illustrated example. 9 is a transmission case that doubles as the machine frame of the rice transplanter, 10 is a seedling mount, and 11 is a planting device. A central grounding body 12 is provided at the lower center of the transmission case 9 which also serves as a machine frame, and a pair of side grounding bodies 13 are arranged at predetermined intervals on the left and right sides thereof so that the front part of each side grounding body 13 can move up and down. The rear part is pivotally attached to the transmission case 9 side.

Reference numeral 14 denotes an elevating link mechanism, in which the base side of the upper link and the lower link are pivotally attached to the pillar 6, and the rear ends of the upper and lower links are pivotally attached by vertical links. Then, a spring receiving case 16 is attached to the upper link via a horizontal shaft 15, and a hydraulic cylinder device 17 in which a base portion is pivotally attached to the rear mission case 7 is provided.
The tip of the piston is projected into the case 16 from the lower side, and a spring 18 is internally provided in the case 16 to form a buffer mechanism.

A hydraulic control valve 19 is fixed to the chassis 2 on the side of the towing vehicle body 1. 20 is a valve switching metal fitting, the front and rear middle is the valve shaft
It is stuck to 21.

Reference numeral 22 denotes a link mechanism, which is configured as follows. Reference numeral 23 denotes a bracket fixed to the front part of the central grounding body 12, and the upper and lower intermediate parts on the front end side of the g-shaped metal fitting 24 are pivotally attached to the bracket 23.
The lower part of the front end of the metal fitting 24 is pulled rearward by the spring 25 so that the front side of the metal fitting 24 is always urged downward. Then, the rear end side of the G-shaped metal fitting 24 and the rear metal fitting 26 pivotally attached to the vertical link are turned into a buckle.
They are connected by a rod 28 provided with 27. The pivot point b is aligned with the pivot points of the lower link and the vertical link. A front metal fitting 29 is also pivotally supported on the front pivoting portion c of the lower link, and the metal fitting 29 and the rear metal fitting 26 are connected by a rod 30. In this way, the front fitting 29 linked to the grounding body 12 is connected to the valve switching fitting 20 via the rod 31. Through such a linkage mechanism 22, when the grounding body moves up above a certain range, the rice transplanter 8 as a working machine is raised, and conversely, when it goes down below a certain range, the rice transplanter 8 is lowered. ing. 32 is an oil type damper mechanism, which is interposed between the front arm portion of the rear metal fitting 26 and an arm 33 fixed to the upper end of the vertical link of the elevating link mechanism 14 which is one component of the machine body, The grounding body 12 has a structure that gives a certain resistance to the upward rotation.
As shown in FIG. 2, the oil-type damper mechanism 32 has a narrow oil passage a provided in the ram 32b in the cylinder 32a. In addition to this example, an oil passage having a check valve in the ram 32b is provided. It is needless to say that when the ram 32b moves downward by providing the above, the ram 32b can be rapidly lowered without resistance.

Reference numeral 42 denotes a hydraulic operation lever, which is arranged on one side of the cockpit 4 and is configured to be pivotable forward and backward.
The metal fitting 34 attached to the base side of and the front metal fitting 29 are linked by the rod 35 so that the hydraulic control valve 19 can be switched.

Reference numeral 36 denotes a sensitivity adjusting lever, which is provided by connecting the front end side of an L-shaped metal fitting 37 pivotally supported to the bracket 23 with a wire 38, and a pivotal support arm on the upper end side of the G-shaped metal fitting 24 and the rear portion of the grounding body 12.
When the rear portion of the grounding body 12 is rotated in coordination with 43 to change and adjust the pricing depth by rotating the arm 43, the grounding body 12 does not operate in the same direction on the front side to cause fluctuations in the heading angle. The outer side of the wire 39 is locked by the L-shaped metal fitting 37.

In the figure, symbol 40 indicates a hydraulic pump, and 41 indicates a transmission shaft.

According to the above configuration, when the paddy field becomes deeper than a certain depth, the tow vehicle body 1 sinks deeply from the paddy field surface, and the central grounding body 12 is pushed upward, the hydraulic control valve 19 on the vehicle body 1 side via the linkage mechanism 22. Hydraulic cylinder device 17
Then, the working machine 8 is raised through the lifting link mechanism 14.

On the contrary, when the paddy field becomes shallower than a certain level, the central grounding body 12
Rotates downward and switches the hydraulic control valve 19 to the side where the rice transplanter 8 is lowered. Therefore, the ground pressure of the grounding body 12 is always propelled within a certain range.

During such work, when the field suddenly deepens and the grounding body 12 is pushed up, the oil type damper mechanism 32 provided for the linkage mechanism 22 resists the pushing up action. When applied, the grounding body 12 is actuated slowly to prevent the hydraulic control valve 19 from being rapidly switched. Therefore, the situation in which the hydraulic control valve 19 is unnecessarily switched to cause the rice transplanter 8 to vibrate vertically due to the vibration operation of the spring 18 of the buffer mechanism is prevented, and the smooth elevation control is performed.

In addition, the damper mechanism 32 prevents the grounding body 12 from moving up and down frequently due to small irregularities in the field, and the hydraulic control valve 19 is not switched.When the grounding body 12 is pushed up or lowered for a certain time or longer, Since the hydraulic control valve 19 is switched only for a limited period of time, a stable elevation control of the rice transplanter 8 is performed.

Furthermore, since the oil-type damper mechanism 32 that suppresses the linking operation of the linking mechanism 22 is provided between the linking mechanism 22 and the machine body, the linking operation of the linking mechanism 22 can be easily set to an appropriate restraining force,
Further, since the damper mechanism 32 is located above the grounding body 12, the damper mechanism 32 does not always be immersed in mud or muddy water, and its operation can be properly performed over a long period of time to ensure stable and stable rice planting. The machine can be raised and lowered.

For the degree of hardness of the topsoil in the field, the sensitivity adjusting lever 36 is pivoted back and forth to pivot the L-shaped metal fitting 37 to change the inner tension of the wire 39 and pull the toe metal fitting 24. Adjustable by changing the tension of the spring 25.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an operation mechanism view of a main part, FIG. 2 is a sectional view of the main part, and FIG. 3 is a side view of the whole. In the figure, 1 is a tow vehicle, 8 is a working machine, 9 is a machine frame, 12 is a grounding body, 14 is a lifting link mechanism, 17 is a hydraulic cylinder device, 19 is a control valve, 22 is a linkage mechanism, and 32 is a damper mechanism. Indicates.

Claims (1)

[Claims] 1. A towing vehicle 1 is equipped with a paddy working machine 8 such as a rice transplanter or a seeder via a lifting link mechanism 14 which is lifted and lowered by a hydraulic cylinder device 17, and is provided on the towing vehicle 1. In the riding-type agricultural working machine in which the operation of the hydraulic cylinder device 17 is switched by the control valve 19, a grounding body 12 is provided on the machine frame 9 of the working machine 8 which is grounded to the paddy field and whose front portion is vertically moved. Working machine 8 for upward movement from a certain range of 12
The work machine 8 against the downward movement from a certain range.
So that the control valve 19 and the front part of the grounding body 12 are linked via a linkage mechanism 22 so as to lower the
An elevator control device for a riding-type agricultural work machine, comprising a damper mechanism (32) for suppressing the interlocking operation of the interlocking mechanism (22) between the airframe (22) and the machine body.