JPH1146529A - Aircraft elevating control device for paddy farming machine - Google Patents

Abstract

(57) [Summary] [Purpose] When a farm work machine for a paddy field automatically controls the lifting and lowering of the farm work machine according to the condition of the topsoil surface of the field, the sensitivity of the lift control is adjusted to a leveling float for leveling the field scene. An object of the present invention is to perform an adjustment change by such a sliding resistance and to perform a high-precision elevation control. SOLUTION: A leveling float 29 is attached to a paddy field agricultural working machine 19 such as a rice transplanter or a paddy field sowing machine so that a front portion moves up and down with a rear portion as a pivot point, and a front side of the leveling float 29 is provided. A switch valve between the leveling float 29 and the hydraulic device 18 such that the agricultural machine 19 for paddy fields is moved up and down by the hydraulic device 18 due to the vertical movement so that the contact pressure of the leveling float 29 is maintained within a certain range. In the control device interlocking with the control valve 37, the switching sensitivity of the switching valve 37 of the hydraulic device is configured to be adjustable, and the switching sensitivity is adjusted so that the sensitivity becomes insensitive when the forward resistance of the float 29 is large. A machine lift control device for a paddy field agricultural work machine configured to sensitively correct sensitivity when possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leveling floor in which a paddy field agricultural work machine such as a rice transplanter or a flooded seeder is mounted on a lower side.
The present invention relates to a machine body elevating control device that operates a hydraulic device in accordance with a change in ground contact pressure of the paddy field to make the paddy agricultural work machine perform elevating control.

[0002]

2. Description of the Related Art Conventionally, an agricultural machine for paddy fields is controlled by raising and lowering a ground contact pressure of a lower leveling float to maintain the ground pressure of the leveling float within a certain range suitable for work. There is also a well-known machine which is provided with a manual or automatic sensitivity control for changing the sensitivity of the elevation control in the state of hard and soft topsoil in a field.

[0003]

In the prior art, a special sensor for detecting the hardness and softness of the field is required, and the size of the hard and soft sensor is limited by the leveling float, and the size of the sensor is limited. The vertical control sensitivity of the machine changes due to a specific detection result, and accurate detection cannot be performed, and the work on the field surface of the work machine is not properly performed due to vertical control due to erroneous sensing. For example, in the case of a rice transplanter, there is a disadvantage that the seedling planting depth varies.

[0004]

The present invention employs the following technical means in order to solve the above-mentioned problems. That is, a leveling float 29 is attached to a paddy field agricultural work machine 19 such as a rice transplanter or a paddy field sowing machine so that the front part moves up and down with the rear part as a pivot point, and the front part of this leveling float 29 moves up and down. As a result, the paddy field agricultural work machine 19 moves up and down by the hydraulic device 18 so that the contact pressure of the leveling float 29 and the hydraulic device 18 is maintained such that the contact pressure of the leveling float 29 is maintained within a certain range.
In the control device, the switching sensitivity of the switching valve 37 of the hydraulic device is configured to be adjustable, and this switching sensitivity adjustment is made insensitive and insensitive when the forward resistance of the float 29 is large. In some cases, the apparatus was used to control the vertical movement of a paddy field agricultural work machine configured to sensitively correct the sensitivity.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A riding type rice transplanter which is an example of the present invention will be described in detail. Reference numeral 1 denotes a riding type traveling vehicle body, in which a front transmission case 3 is mounted on a front side of a body 2 extending in the front-rear direction at the left and right center positions, and a rear transmission case 4 is mounted on a rear end side. On the left and right sides of the front transmission case 3, there are protruded shaft case cases 3a, 3a enclosing the front wheel drive shaft, and downwardly directed steering transmission cases 3b, 3b,
3b, and the front wheel 5 is mounted on a rotating shaft protruding outside the transmission cases 3b, 3b. On the other hand, a rear cylinder case 4a, 4a for wrapping a rear wheel axle projecting to the left and right sides is protruded from the rear transmission case 4, and rear wheel transmission cases 4b, 4b are fixed to outer ends thereof. Rear wheel drive case 4b,
The rotating shaft projects from 4b, and the rear wheel 6 is attached to this.

Reference numeral 7 denotes a boarding floor, which is stretched over the upper surface of the body 2. Reference numeral 8 denotes an engine, which is mounted in the front and rear middle part of the body 2. Reference numeral 9 denotes an engine cover. 1
Numeral 0 denotes a control frame, which is erected at the front left and right central portions of the boarding floor 7 and has a steering post 11 protruding from the upper end thereof. 12 is attached.

Reference numeral 13 denotes a control seat, and the engine cover 9 is provided.
It is provided on the upper surface. Reference numeral 14 denotes a support column for attaching a link, and a rear-mishunker provided on a rear end side of the body 2.
The base end is fixed to the base 4 and is standing upright. A lifting link mechanism 15 pivotally connects the bases of the upper link 16a and the lower link 16b to the support post 14 and the rear end of the link 16 to the vertical link 16.
c, and a lever 17 provided integrally with the upper link 16a is connected to a piston rod 18b of a hydraulic cylinder device 18, which is a main part of a hydraulic device attached to the body 2 side. Upper link 16a with cylinder device 18
Is configured to be turned up and down. The hydraulic cylinder device 18 is configured such that a cylinder 18a is pivotally connected to the body 2 and a piston rod 18b protruding from the cylinder is directed rearward and upward.

Reference numeral 19 denotes a paddy field agricultural work machine, which in the embodiment is a rice transplanter. To explain this rice transplanter, reference numeral 20 denotes a transmission case also serving as a frame, and a main transmission case 20a to which power is input from the traveling vehicle body 1 is provided at the front center of the left and right sides. A sub-transmission case 20b is provided at a predetermined interval on the left and right sides from the case 20a, and branches off and extends rearward as appropriate. Numeral 21 denotes a seedling mounting table, which is inclined from the side so that the front side is higher than the upper side of the transmission case 20 and reciprocates to the left and right sides of the transmission case 20 via supports 22 and 23. The main engine drive case 20a is configured to move laterally.
It is configured to be reciprocated by a lead cam mechanism as a left-right reciprocating lateral moving mechanism.

Numeral 24 denotes a seedling receiving frame, which is provided in the transmission case 20 so as to extend longitudinally in the transmission case 20 so as to face the opening at the lower end on the rear side of the front machine seedling mounting table 21. It is formed in an L-shaped side surface so that it can receive the direction. The seedling receiving frame 24 is provided with a seedling dividing port left and right separated by a predetermined distance. Numeral 25 is a seedling plant, and a rotating case 2
6 is attached with a swinging attachment 28 to which a seedling separating claw 27 is fixed, and the seedling separating claw 27 is vertically long in a side view.
The tip of the seedling separation claw 27 intervenes from the upper part of the seedling dividing port from above and separates and engages the seedlings one by one to plant in the lower field scene.

Numeral 29a designates a center leveling float. The rear side of the float 29a is attached to the transmission case 20 by a pin 30 and has a front end pivotally mounted on a metal fitting 31 which is vertically movable. A shaft 32 is provided, and is attached to a metal 33 which is inserted through the shaft 32 and is slidable back and forth. The metal 33 is held at a middle position between the front and rear by compression springs 34 and 34 on the front and rear sides. The base is fixed to the transmission case 20 and is attached to a projecting frame 35 projecting forward via an expansion / contraction link 36 so as to be vertically movable. 37 is a hydraulic switching valve
The valve shaft is attached to the protrusion frame 35, and the valve shaft is projected downward and attached to the float 29a. When the front side of the center leveling float 29a swings up and down, the hydraulic switching valve 37 is switched and Hydraulic cylinder device 18
Is configured to be activated.

Numerals 29b, 29b denote side grounding floats, which are provided on the left and right sides of the central ground leveling float 29a with a predetermined space therebetween, and have a rear part pivotally supported by the transmission case 20 and a front part. Are configured to be vertically movable. When attaching the rice transplanter, which is the agricultural work machine 19, to the rear portion of the elevating link mechanism 15, the hitch 39 attached to the front side of the transmission case 20 of the rice transplanter via a rolling shaft 38 is connected to the vertical link. 16c. Therefore, the rice transplanter, which is the agricultural working machine 19, is provided to be able to move up and down by the hydraulic cylinder device 18.

That is, when the front side of the center leveling float 29a is greatly pushed up, the piston 18b of the hydraulic cylinder device 18 protrudes and the switching valve 3 is raised so as to raise the rice transplanter.
7 is switched, and conversely, when it descends greatly, piston 1
The switching valve 37 is switched so that 8b retracts and the rice transplanter descends. In addition, when the front and rear movement of the central ground leveling float 29a due to the grounding traction resistance and the vertical operation resistance of the hydraulic switching valve 37 are linked, and the float 29a moves rearward due to sliding resistance, When the upward movement resistance of the float 29a is increased to increase the switching resistance of the hydraulic switching valve 37 toward the rice transplanter ascending side, and conversely, when the slide resistance at which the leveling float 29a does not largely move rearward becomes small, The updraft resistance of the leveling float 29a is small, and the switching resistance of the hydraulic switching valve 37 to the rice transplanter ascending side is reduced.

As a specific example, as shown in FIG. 2, an expansion / contraction link 36 for attaching the front side of the center leveling float 29a to the projection frame 35 and the center leveling float 29a are connected to a wire 38 and a spring. Link at 39, Float 2
When 9a moves rearward, the upward dynamic resistance of the float 29a is increased so that the switching resistance of the switching valve 37 to the side where the rice transplanter is raised is increased. In FIG. 3, the switching valve 37 itself and the leveling float 29a are connected by wire.
This is an embodiment in which the switching resistance of the hydraulic switching valve 37 is similarly adjusted by linking with a spring 38a and a spring 39a.

In the embodiment shown in FIG. 4, the switching sensitivity of the hydraulic switching valve 37 is automatically adjusted by microcomputer control. The resistance at which the center ground leveling float 29a moves backward is detected by a sensor 40. The signal value from the sensor 40 is sent to the microcomputer control unit, and the enlargement / reduction link 3 of the leveling float 29a is sent.
The spring 41 for urging the expansion cylinder 6 toward the expansion side is configured to be adjustable by an electric cylinder 42 by a servo motor, and the servo motor is driven by a command signal from the microcomputer control unit to drive the electric cylinder 42. Is used to change and adjust the tension of the spring 41.

The operation of the above example will be described. In the state of the topsoil surface typified by the hardness of the paddy field topsoil during rice transplanting work, if a sliding resistance is applied to the center leveling float 29a, the leveling float is applied. The upward movement resistance of 29a increases, and the hydraulic switching valve 37 slows down the automatic rise of the rice transplanter, which is the working machine, by the hydraulic cylinder device 18. That is, the flow
When the door 29a moves rearward, the reduction resistance of the expansion / contraction link 36 is increased via the wire 38 and the spring 39,
The switching resistance of the hydraulic switching valve 37 toward the rice transplanter ascending side increases. Therefore, in a field where the sliding resistance is greatly applied to the leveling float 29a, the sensitivity of controlling the lifting of the work machine is reduced. Conversely, in a field where the sliding resistance is small, the lifting of the working machine is sensitively controlled. Therefore, the raising / lowering control of the agricultural working machine automatically changes according to the state of the field, and the working accuracy is improved.

[0016]

According to the present invention, the sensitivity of the lifting control of the agricultural work machine changes according to the hardness and unevenness of the topsoil surface of the field, and highly accurate work can be expected.

[Brief description of the drawings]

FIG. 1 is a partially simplified side view.

FIG. 2 is a side view of a main part.

FIG. 3 is a hydraulic control circuit diagram.

FIG. 4 is a simplified side view including a control circuit of another example.

FIG. 5 is a perspective view of a main part.

[Explanation of symbols]

 18 Hydraulic system 19 Paddy field agricultural work machine 29 Leveling float 37 Switching valve

Claims (1)

[Claims] A leveling float (29) is mounted on a paddy farming machine (19) such as a rice transplanter or a paddy field sowing machine so that the front part moves up and down with the rear part as a pivot point, and the front side of the leveling float (29). The paddy field agricultural work machine 19 is moved up and down by the hydraulic device 18 due to the vertical movement of the paddy field, and the leveling float 29 and the hydraulic device 18 are switched so that the contact pressure of the leveling float 29 is maintained within a certain range. In a control device that operates in conjunction with the valve 37, the switching sensitivity of the switching valve 37 of the hydraulic device is configured to be adjustable, and the switching sensitivity is adjusted so that the sensitivity is insensitive when the forward resistance of the float 29 is large. An apparatus for lifting and lowering the body of a paddy field agricultural work machine configured to sensitively correct the sensitivity when it becomes small.