JPH10248330A - Walking-type rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact rice transplanter by making the tread of left and right paddy field wheels small in a walking-type rice transplanter. SOLUTION: A wheel transmission case is provided with a first wheel bearing transmission case 17 which is integrated with a first bearing 19 integratedly and rotatably provided in the projected cylinder part 2a of a mission case 2 for covering the wheel driving shaft 18 of the mission case and the second wheel transmission case 20 which is rotatably around the second bearing 22 integratedly provided of the first wheel transmission case 17 for covering a counter driving shaft 21 which is on the tip side inner surface of the first wheel transmission case 17 and also projected to the inner side of the first wheel transmission case 17. Paddy field wheels 24 are fitted to the driving wheel shaft 23 projected to the tip side outer part of the second wheel transmission case 22, the first and the second wheel transmission case are operated by a first hydraulic cylinder device 25 and then second hydraulic cylinder device 26 specially and also the paddy field wheels 24 are arranged so as to be positioned at the rear side of the first wheel transmission case 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walk-behind rice transplanter, and more particularly, to driving and arranging paddy wheels located on left and right sides.

[0002]

2. Description of the Related Art Conventionally, the driving of paddy wheels located on the left and right sides of a walking rice transplanter has been disclosed in Japanese Utility Model Laid-Open No. 1-90317. In this prior art, a paddy wheel is driven by a refraction cooperation mechanism of a first chain case and a second chain case. But this one
A second chain case is provided outside the first chain case, and an axle is protruded outside the second chain case to drive paddy wheels.

[0003]

The prior art has the disadvantage that the paddy wheels are far away from the center of the fuselage and the width of the fuselage is large.

[0004]

The present invention employs the following technical means in order to solve the above-mentioned problems. That is, the engine 1 and the transmission case 2 are arranged on the front side,
A rice transplanting device 4 is mounted on the rear side through a machine frame 3 extending rearward from the transmission case portion, and a steering handle 6 which is directed rearward and upward from a planting portion transmission case 5 of the rice transplanting device 4.
A seedling mounting tool 7 is provided in a planting part transmission case 5 and a seedling mounted on a seedling mounting table 8 which moves left and right on the operation handle is divided and planted. 3 is equipped with a leveling float 14 on the lower side, and paddy wheels 24, 24 for propulsion are arranged on the left and right sides of the machine frame 3, and the paddy wheels are mounted on the left and right sides of the transmission case 2. Projecting drive shaft 1
In a rice transplanter wheel transmission configuration of a rice transplanter having a configuration driven from a wheel transmission case 8 through a wheel transmission case, the wheel transmission case is integrated with a transmission case that covers a wheel drive shaft 18 of the transmission case 2. A first wheel transmission case 17 integrally formed with a first metal 19 rotatably provided on the protruding cylindrical portion 2a, and a first wheel transmission case 17 on the inner surface on the distal end side of the first wheel transmission case 17;
A first wheel transmission case 17 covering the counter drive shaft 21 protruding inside the wheel transmission case 17 is provided with a second wheel transmission case 20 rotatable around an integral second metal 22. The paddy wheel 24 is mounted on a drive axle 23 projecting outward from the distal end side of the second wheel transmission case 22.
And the second wheel transmission case is specially operated by the first hydraulic cylinder device 25 and the second hydraulic cylinder device 26, and the paddy wheels 24, 24 are located on the rear side of the first wheel transmission case 17. And a walk-behind rice transplanter.

[0005]

An embodiment of the present invention will be described in detail with reference to the drawings. 1 is an engine. Reference numeral 2 denotes a transmission case, which is located at the rear of the engine 1 and is fixed to the engine 1 with a narrow left end portion on the front end side. A power transmission section is formed in a narrow portion by projecting the engine output shaft from the fixed portion, and is configured to transmit a drive mechanism in the transmission case 2. Reference numeral 3 denotes a machine frame having a base portion fixed to the left and right central portions of the rear end of the transmission case 2 and extending rearward.

Numeral 4 denotes a rice transplanting device, in which a planting part transmission case 5 is fixed to the rear end of the machine frame 3, and this planting part transmission case 5 is provided.
The steering handle 6 is attached via a handle frame 61. The handle frame 61 is configured to be inclined rearward and upward. Numeral 7 denotes a seedling planting tool, which is attached to the side of the planting portion transmission case 5 via a double crank arm. It operates so as to draw a closed loop locus, separate and hold the seedlings, and plant them in the field scene. Numeral 8 is a seedling mounting table, which is inclined along the upper part of the handle frame 61 and which can be moved laterally horizontally by support rails 9a and 9b.
And the steering wheel 6. That is, the support rail 9a on the lower front side has an L-shape when viewed from the side, and has a notch for cutting the seedlings through which the seedlings 71 can pass from above to split the seedlings. . The support rail 9b is, as shown in FIG.
1. A handle mounting shaft 61a extending in the left-right direction is fixed to the rear end of the base 1, and both right and left ends thereof are formed on the chrysanthemum metal 10a.
On the other hand, the base of the left and right independent steering handle 6 is formed in a chrysanthemum seat 10b that is fitted to the chrysanthemum metal 10a and fastened with bolts 11, and a support shaft for supporting the seedling mounting table 8 on the handle mounting shaft 61a. 12 is fixed and the leading end side is bent rearward, and a roller 13 is fitted into the bent portion, and the roller 13 is used to attach the U-shaped support rail 9b to the seedling mounting table 8 which is fixed. It is configured to be fitted and supported.

A leveling float 14 is disposed below the machine frame 3 and has a rear portion pivotally mounted on a lever 15 provided on the handle frame 61 so as to be rotatable. It is configured to be movable. 16 is a mounting link. Reference numeral 17 denotes a first wheel transmission case, which is the transmission case.
Cylindrical portion 2a enclosing a drive shaft 18 protruding to the left and right sides of the
The base side is fixed to a rotatable metal 19 which is fitted to the outer periphery of the base and is configured to be rotatable back and forth.

Reference numeral 20 denotes a second wheel transmission case, which is a counter drive shaft 21 which is located on the inner side of the front end of the first wheel transmission case 17 and protrudes inside the first wheel transmission case 17.
And is rotatable around a second metal 22 integral with the first wheel transmission case. Reference numeral 23 denotes a drive axle, which protrudes from the outside of the distal end of the second wheel transmission case 20. A paddy wheel 24 is mounted on the shaft 23. In other words, the paddy wheel 24 is disposed at the rear side of the first wheel transmission case 17.

Next, the hydraulic control mechanism will be described.
The first wheel transmission case 17 is swing-operated by a first hydraulic cylinder device 25. The second wheel transmission case 20 is swung by a second hydraulic cylinder device 26 and a third hydraulic cylinder device 27. That is, in the first hydraulic cylinder device 25, the cylinder case 25a is attached to the transmission case 2, and the piston rod 25b is connected to the left and right first wheel transmission cases 17,17.
When the piston rod 25b projects, the left and right first wheel transmission cases 17, 17 swing upward, and conversely, the piston rod 25
When b is retracted, it is configured to swing downward.
In the second hydraulic cylinder device 26, a cylinder case portion 26a is attached to the transmission case 2, and a balance rod 29 swinging back and forth is pivotally mounted on the distal end side of the piston rod 26b. The left and right end portions of the third hydraulic cylinder device are connected to the second wheel transmission case 20 via a rod 30, and a third hydraulic cylinder device 2 is provided in the middle of one rod (left rod) 30.
7, the left and right paddy wheels 24, 24 are made to swing in opposite directions by the third hydraulic cylinder device, and the balance rod 29 is always kept in an equilibrium state. The grounding load of 24, 24 is made substantially constant so that the body does not tilt from side to side. Explaining the hydraulic circuit diagram, 31 is a pump, 32 is a tank,
Reference numeral 33 denotes a flow dividing valve, and one of the hydraulic oils distributed to the two systems by the flow dividing valve 33 receives the first oil through a first hydraulic switching valve 34.
The hydraulic cylinder device 25 is controlled, and the first hydraulic switching valve 34 is switched by a pitching inclination detector 35 for detecting when the machine body is tilted forward or backward by a certain amount or more, and the machine body becomes a front load and the rear side rises. In such a case, the first wheel transmission case 17 is swing-controlled toward the front so as to move the paddy wheel 24 to the front side. Conversely, when the front load rises due to the rear load, the paddy field is increased. The first wheel transmission case 17 is controlled to swing rearward so as to move the wheels 24 rearward. The pitching inclination detector 35 shown in the figure is provided with an arm 36 which can swing back and forth toward the fuselage.
The first hydraulic switching valve 34 is configured to be switched by the tilting of the arm 36.

The hydraulic oil distributed to the other side is sent to the second hydraulic cylinder device 26 via the second hydraulic switching valve 37 to swing the left and right second wheel transmission cases 20. I have. The second hydraulic switching valve 37 is
It is switched by the vertical movement of the front part of the leveling float 14 and is switched when the float 14 side swings due to the variation of the cultivation depth of the field to control the paddy wheel 24 up and down. The contact pressure is controlled so that the seedling planting condition is maintained properly. Specifically, the front side of the leveling float 14 and the switching valve shaft of the second hydraulic switching valve 37 are connected by a rod 38, and the front part of the leveling float 14 has a certain range in which the depth of the paddy field changes deeply. When pushed up as described above, the switching valve 37 is switched so as to lower the paddy wheel 14,
Conversely, the switching valve 37 is configured to switch so that the paddy wheel 14 is raised when the front part of the ground leveling float 14 is changed to be shallow and the front part of the leveling float 14 is largely lowered.

The third hydraulic cylinder device 27 is provided as a mechanism for correcting the inclination of the machine body to the left and right sides by a predetermined range or more. That is, the third hydraulic switching valve 40 is switched by the rolling inclination detector 39 of the body to control the third hydraulic cylinder device 27. As a specific embodiment, this rolling inclination detector 39 is provided with a weight W2 suspended from the body and swingable to the right and left via an arm 41. 3 hydraulic switching valve 40
Are switched, and the operation of the third hydraulic cylinder device 27 is controlled. When the body is tilted to one side to the left or right beyond a certain range, the detector 39 detects this and switches the switching valve 40 to change the substantial length of the left rod 30 and the balance rod 29.
Are controlled to be in a substantially equilibrium state.

The operation of the above example will be described. When seedlings are placed on the seedling mounting table 8 and the rotating parts are transmitted by the engine 1, the left and right paddy wheels 24, 24 are rotated, and the terrain float 14 is moved to the paddy fields. It is propelled in a state of touching the topsoil. In addition, the rear side of the rice transplanting device 4 is driven, the seedling mounting claws 71 of the seedling planting tool 7 draw a closed loop trajectory in a side view, and the seedling mounting table 8 reciprocates left and right to be fed out to the seedling dividing port. Seedlings are separated and planted in the field scene.

During the seedling planting operation, the right and left pair of paddy wheels 24, 24 are automatically controlled to move up and down according to the depth of the paddy field. The aircraft is controlled so that it is always in the horizontal state, and the balance in the front-rear direction is the first.
It is held by the front and rear automatic swing of the wheel transmission case 17 and the variation of the seedling planting depth can be reduced. In addition, since the paddy wheels 24, 24 are located on the rear side of the first wheel transmission case 17, the lateral width of the machine body can be reduced, and a compact walking rice transplanter can be obtained.

FIG. 5 shows an embodiment in which the rotating connection portions of the transmission cases 17 and 20 are changed up and down. The rotation fulcrum side of the transmission case 17 is on the lower side and the transmission case is on the upper side. 20 are rotatably connected. HST (Hydro. Stadek.
In the case of a riding type rice transplanter or a walking type rice transplanter in which the traveling unit and the planting unit are driven via a transmission, there is a disadvantage that power is transmitted even when the operation lever is operated to the neutral position. . Therefore, in order to solve this drawback, a clutch is provided in a path for driving the HST mechanism from the engine, and a clutch is provided so that power is not automatically transmitted from the engine to the HST side when the operation lever is operated to the neutral position. It is good to operate "off". As a specific example,
6 to 8 are shown.

The hydraulic pump 45 is driven by a belt tension clutch 44 which is turned on and off by a tension pulley 43 which is operated by an electric cylinder 42 by a servo motor from the engine. As a result, the driving-side hydraulic motor 46 is operated. Then, the output side hydraulic motor 47 is driven from the driving side hydraulic motor 46,
The transmission unit 49 of the rice transplanter is driven from a drive shaft 48 of the output hydraulic motor 47. The HST operation lever 51 for adjusting the speed change swash plate 50 of the driving-side hydraulic motor 46 can adjust forward, neutral, reverse and the shift speed. When the neutral is selected, the switch SW1 is used.
Then, the servomotor is driven, and the transmission of the hydraulic pump 45 from the engine is cut off. Therefore, if the HST operation lever is set to the neutral position, the hydraulic pump 45 stops and the drive by the hydraulic motor is not reliably performed. In the above-described embodiment, the hydraulic pump 45 is stopped when the HST operation lever 51 is operated to the neutral position. However, the hydraulic pump 45 is not stopped and the driving-side hydraulic motor 46 is stopped. Pump 45 during
A circuit having a hydraulic switching valve for returning hydraulic oil from the tank to the tank may be provided, and the switching valve may be linked to the HST operating lever 51. In other words, when the neutral is selected by the HST operating lever 51, , The drive of the HST itself should be surely stopped.

As shown in FIG. 8, the tension pulley of the above-described embodiment is scanned by an output signal from the control unit CPU of the microcomputer.
The belt tension clutch is operated by an electric cylinder driven by a motor, and an HST operation lever 51 is provided as a neutral signal as an input signal to a control unit CPU.
In such a case, the output signal is transmitted to the servomotor side to operate the belt tension clutch "disengage". Further, when the control unit CPU has insufficient power generation capability from the generator on the engine side, that is, when the engine load increases and the rotation decreases, the engine stalls. The signal is sent from the generator voltage detection sensor of the generator to the control unit CPU, and at this time, the belt tension clutch is "disengaged".
, So that the engine is not stopped unexpectedly.

[0017]

According to the present invention, during this seedling planting operation, a pair of left and right paddy wheels 24, 24 is automatically controlled to move up and down automatically in accordance with the depth of the paddy field, and the body is constantly horizontally leveled. In this state, the balance in the front-rear direction is maintained by the automatic swing of the first wheel transmission case 17 in the front-rear direction, so that the variation in the planting depth can be reduced.

Further, since the paddy wheels 24, 24 are located on the rear side of the first wheel transmission case 17, the lateral width of the body can be reduced and a compact walking type rice transplanter can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view

FIG. 2 is a partially simplified plan view.

FIG. 3 is a perspective view of a main part.

FIG. 4 is a hydraulic circuit diagram of a hydraulic control operation unit.

FIG. 5 is a side view of a main part of another example.

FIG. 6 is a side view of a main part.

FIG. 7 is a hydraulic control diagram in which a main part is partially sectioned.

FIG. 8 is a control circuit diagram of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Mission case 2a Projection cylinder part integrated with mission case 3 Machine frame 4 Rice transplanting device 5 Planting part transmission case 6 Steering handle 7 Seedling plant 8 Seedling mounting stand 14 Leveling float 17 First Wheel transmission case 18 Drive shaft 19 First metal 20 Second wheel transmission case 21 Counter drive shaft 22 Second metal 23 Drive axle 24 Paddy wheels 25 First hydraulic cylinder device 26 Second hydraulic cylinder device

Claims (1)

[Claims] An engine 1 and a transmission case 2 are arranged on a front portion, and a rice transplanting device 4 is mounted on a rear side through a machine frame 3 extending rearward from the transmission case portion. A control handle 6 is attached to the planting part transmission case 5 so as to move rearward and upward, and a seedling plant 7 is provided in the planting part transmission case 5 to move the seedling mounting table on the control handle horizontally. The seedlings mounted on the plant 8 are divided and planted. A ground leveling float 14 is provided on the lower side of the machine frame 3, and paddy wheels 24, 24 for propulsion are provided on both left and right sides of the machine frame 3. A paddle wheel transmission structure of a rice transplanter, wherein the paddy wheel is arranged and driven via a wheel transmission case from a drive shaft 18 protruding to the left and right sides of the transmission case 2; The wheel drive shaft 1 of the transmission case 2
A first wheel transmission case integral with a first metal 19 rotatably provided on a projection cylindrical part 2a integral with the transmission case covering the transmission case 8.
And a first wheel transmission case 17 that covers a counter drive shaft 21 that is located on the inner surface at the distal end side of the first wheel transmission case 17 and protrudes inside the first wheel transmission case 17. And a second wheel transmission case 20 rotatable around a second metal 22 integrated therewith. The paddy wheel 24 is mounted on a drive axle 23 protruding outward on the distal end side of the second wheel transmission case 22. Attachment, the first and second wheel transmission cases are specially operated by a first hydraulic cylinder device 25 and a second hydraulic cylinder device 26, and the paddy wheels 24, 24 are mounted on the first wheel transmission case. A walking rice transplanter arranged to be located on the rear side of the fabric 17.