JPH0126645B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides high stability against pitching and rolling of the aircraft body, good responsiveness of the automatic elevation control operation of the traveling wheels based on the detection of the ground pressure of the float, and the ability to follow the operator's travel. Easy walking type 4
This rice transplanter was developed for the purpose of providing a rice transplanter for row planting, in which the plowing depth is set at the front central position of a pair of left and right running wheels, with the rear end edge located in front of the axle of the running wheels. A front float is provided as a sensor for automatically controlling the elevation and descent of the wheels by sensing changes in ground pressure due to fluctuations in A four-row planting mechanism is temporarily installed between the rear floats, and soil leveling sections for the two center rows of planned planting sites are installed on both left and right sides of the front float. It is characterized by having soil leveling sections connected to each of the two outer rows where planting is planned.

In other words, by providing three-point support using three floats placed at the center of the front of the pair of left and right running wheels and at both left and right positions at the rear, rolling and pitching can be sufficiently suppressed while the aircraft is running, thereby improving stability. Since rice planting work can be carried out with a good attitude of the machine, it is easy to operate the machine, there is little variation in planting depth in the left and right directions, and it is easy to achieve uniform planting performance. Furthermore, with such a two-wheeled, four-row walk-behind rice transplanter, the operator must walk between the planted seedlings in the two central rows, so unlike conventional rice transplanters, the muddy soil is still stable even after the land has been leveled. If the planted seedlings are planted under such conditions and walked among them, the posture of the planted seedlings will be immediately disturbed.In this invention, however, in the present invention, the soil leveling part of the front float and the two central rows are Because the planting positions are widely separated in the front and back directions, the two central rows of seedlings can be planted on the leveled surface after the muddy soil blown up from the rear end of the front float has stabilized. This method has the advantage that external factors that disturb the posture of seedlings can be reduced, making it easier to stabilize the posture of planting seedlings compared to the conventional method.

In this way, for seedlings with two central rows, the soil preparation section and the planting area are separated by a large distance in the front and back direction of the machine. Compared to the case where the ground leveling parts on both the left and right sides and the longitudinal direction of the aircraft are the same, in other words,
Compared to placing the ground leveling part of the front sensor float in the same position as the ground leveling part of the left and right rear floats in the longitudinal direction of the aircraft, the rear end of the front sensor float is inevitably located at the rear of the aircraft, resulting in a smaller float area. The sensing performance of the front sensor float will not deteriorate due to the increase, or
In order to make the two center grading sections the same as the left and right grading sections in the longitudinal direction of the aircraft, compared to the case where a dedicated grading float is installed behind the front sensor float in addition to the front sensor float. When the front sensor float detects a convex part of the mud surface and lowers the wheels, this prevents the aircraft from rolling due to the central leveling float riding on the front convex part. It is advantageous in that it can be Also, since the front float is used to level the ground in the center two rows and there is no float in the rear center,
It is located between the two central strips, and the footwell of the pilot who follows his walking is wide, making it easy for him to walk.

Embodiments of the present invention will be described below based on illustrative drawings.

FIG. 1 and FIG. 2 show the entire side and plan view of the rice transplanter of the present invention, and the general structure is as follows.

An engine 2 and a main transmission case 3 are directly connected in series to the front end of a longitudinally long cylindrical frame 1 placed in the center of the left and right sides of the aircraft, and a seedling planting device for planting four rows is provided at the rear of the frame 1. 4 and a control handle 5 are provided, and one front float 6 made of hollow synthetic resin is provided below the engine 2 and the main transmission case 3, and a front float 6 made of hollow synthetic resin is provided below the seedling planting device 4. is provided with a pair of left and right rear floats 7, 7, respectively, and furthermore, a pair of left and right rear floats 7, 7 is provided, and furthermore, a pair of rear floats 7, 7 is provided at the center of the front floats 6, 7 in the longitudinal direction and
A pair of left and right running wheels 8, 8 can follow the hard plate via transmission cases 9, 9 which extend rearward from the main transmission case 3 in a vertically swingable manner. It is supported on.
The seedling planting device 4 also includes a seedling tray 10 that accommodates pine-shaped seedlings A in four rows and moves back and forth laterally with a constant stroke, and a seedling take-out device formed at four locations at the lower end of the seedling tray 10. A seedling planting mechanism 11 for cutting out a certain amount of seedlings from the mouth a and planting them on the mud surface, and a rear transmission case 1 equipped with these drive mechanisms.
It is composed of 2. Fin-shaped ground leveling parts 6', 6' for leveling the two central rows of planting sites are integrally connected to the left and right sides of the front float 6 near the rear, and the rear float 7, Fin-shaped ground leveling parts 7', 7' for the planned planting areas of the two outer rows are integrally connected to the front side of each inner part of the seedlings 7, respectively.

Figures 3 and 4 show the rear transmission case 12.
This shows the inside of the . This transmission case 12 supports an input shaft 13, an intermediate transmission shaft 14, a drive shaft 15 for horizontally moving the seedling tray, and a slide shaft 16 for horizontally moving the seedling tray.
3 is connected to the rear end of a power transmission shaft 17 extending rearward from the main transmission case 3 through the frame 1, and the input shaft 13 and the intermediate power transmission shaft 14 are connected to each other at a constant rotational phase of the shaft 14. It is interlocked via a planting clutch 19 which is held in check by an abutting pin 18 so that the cutting operation can only be performed at the . Further, a large and small two-stage shift gear 20 is spline-fitted to the intermediate transmission shaft 14, and is selectively engaged with large and small transmission gears 21a and 21b fixed to the drive shaft 15. It is configured such that the rotational speed of the drive shaft 15, that is, the lateral movement speed of the seedling stand can be adjusted in two steps.

The drive shaft 15 is formed with a spiral groove 22 that reciprocates in series across the left and right ends, and a driven piece 23 attached to the slide shaft 16 is engaged in the groove 22, so that the drive shaft 15 Arms 33, 3 are attached to the slide shaft 16 and its both protruding ends as the driven piece 23 thrusts in a fixed direction.
The seedling stand 10 connected through the holder 3 is configured to be moved laterally and reciprocated with a constant stroke. or,
On both sides of the driven piece 23, there are arms 25, which can come into contact with cams 24, 24 fixed to both ends of the drive shaft 15.
25 is fixed to the slide shaft 16, and when the slide shaft 16 reaches the stroke end, the sliding shaft 16 is rotated by a certain angle due to the contact between one of the rotating cams 24 and one of the arms 25. The rotation of the slide shaft 16 is configured to rotate, and the rotation of the slide shaft 16 causes the seedling feed claw 2 provided at the lower part of the seedling stand 10 to rotate.
6... via a link mechanism 28. (See Fig. 10) The seedling stand 10 itself has its lower end slidably guided by a slide rail 29 horizontally fixed to the rear transmission case 12, and a guide 30 connected from the operating handle 5 is connected to the seedling stand 10. It is engaged with a rail 31 fixed to the back surface of the robot 10 and held in a constant backward tilted position. In addition, the arms 33, 33 that connect the seedling stand 10 to the end of the slide shaft 16 are provided with:
Seedling receiving rods 32, 32'' that receive the leaves of the mounted pine seedlings A are horizontally supported in two levels, upper and lower, and the lower rod 32' is used to feed seedlings in rows that will not be planted. A seedling stopper 34 made of synthetic resin is provided for each row in order to catch the seedlings above the claws 26, and at the time of planting, the seedling stopper 34 is rotated upward and elastically engaged with the upper rod 32. It is starting to be retained.

Further, from the left and right center of the rear transmission case 12, a transmission case portion 12a for the planting mechanism 11 extends downward, and a drive shaft 35 horizontally supported on the lower end of this case portion 12a and the intermediate Transmission shaft 1
4 are linked together in a chain. Two central planting mechanisms 11, 11 are provided at both ends of this drive shaft 35.
The crank arms 36, 36 of are fixed.
Further, support arms 37, 37 extend downward from the left and right ends of the rear transmission case 12, and the drive shaft 3 is connected to the lower ends of the arms 37, 37.
Rotating shafts 38, 38 are respectively supported concentrically with the rotating shafts 38, 38, and arms 39, 39 attached to one end of the rotating shafts 38, 38 and planting mechanisms 11, 11 with two central rows.
The crank arms 36, 36 are the support shafts 40, 40.
are engaged and interlocked via the respective rotating shafts 38,
Crank arms 41, 41 attached to the other end of 38
It is configured to drive the planting mechanisms 11, 11 of the two outer rows. The planting mechanism 11 employs a well-known mechanism in which a planting arm 11a that is driven up and down by a four-link crank structure is equipped with a planting claw 11b and a seedling pusher 11c at the tip.
The planting clutch 19 is wire-coupled to a planting clutch lever 42 provided on the control handle 5, and can be engaged by swinging forward and disconnected by swinging backward.

5 to 7 show the suspension structure of the main wheels 8, 8.

A double-acting hydraulic cylinder 4 is mounted on the frame 1.
3 is fixed, and its piston rod 4
A balance arm 46 is pivotally attached to a bracket 45 fixed to the end of the wheel transmission case 4 so as to be swingable about a vertical axis fulcrum P. arm 47, 47
are connected via rods 48, 48, and as the piston rod 44 moves up and down, both wheels 8, 8 move up and down in the same direction at the same time. 8, 8 are configured to move up and down in opposite directions. Further, the bracket 45 is equipped with a lock pin 49 that prevents the balance arm 46 from rotating around the fulcrum P, and the balance arm 46 is equipped with a lock pin 49 that prevents the balance arm 46 from rotating when the left and right wheels 8 are at the same height with respect to the aircraft body. Only one hole 50 is formed into which the lock pin 49 can be inserted. The lock pin 49 is spring biased toward the lock side, and when the planting clutch 19 is in the engaged state, the lock pin 49 is released, and the planting clutch 19 is released.
It is wire-coupled to the planting clutch lever 42 so that it can be locked in the cut state. Therefore,
During normal planting, the balance arm 46 can swing freely, and the left and right wheels 8,8
follows freely and prevents the aircraft from rolling.
It can be locked during non-operation when the planting clutch is disengaged, such as when turning the aircraft or driving on the road.When the wheels 8 and 8 are at the same height, the locking pin 49 is automatically activated to fix the balance arm 46, and the balance arm 46 is fixed on the left and right sides of the aircraft. Make sure it stays level. In addition, the bracket 45
is supported and guided by a pair of left and right guide rods 51, 51 fixed on the fleller 1, and
A bracket 45 is supported by a buffer spring 52 so as to be slidable back and forth within a certain range relative to the piston rod 44. Further, a stopper 53 is fixed on the frame 1 for abutting and regulating the backward movement limit of the bracket 45, that is, the lowering limit of the wheels 8, 8, and another stopper 53' can be attached or detached to this stopper 53. It is attached so that its posture can be changed freely, and is configured so that the maximum descending height of the wheels 8, 8 can be set and changed in two steps. Further, both ends of the balance arm 46 are equipped with idle rollers 54, 54 for smooth relative movement when the balance arm 46 contacts the stoppers 53, 53' in an inclined position.

8 and 9 show a wheel elevation control section, and a cylinder drive unit 55 consisting of a pump for absorbing lubricating oil in the case and a three-position switching valve is directly connected to the right side of the main transmission case 3. Discharged oil from this unit 55 is supplied to the hydraulic cylinder 43. And this unit 55 is
When the spool 56 is pulled out rearward, the piston rod 44 protrudes and the wheels 8, 8 are lowered, and conversely, when the spool 56 is pushed forward, the wheels 8, 8
Pressure oil is switched and supplied to the hydraulic cylinder 43 so that the pressure rises.

The spool 56 is pivotally connected to one end of an L-shaped arm 57 that is pivotally supported on the right side of the main transmission case 3, and is connected to a rod 58 that is pivotally connected near the other end of the L-shaped arm 57. The lower end is pivotally connected near the rear of the front float 6.
Further, a tongue piece 59 is fixed to the middle of the L-shaped arm 57, and a pressure setting spring 60 and a backlash absorbing member 61 for supporting the tongue piece 59 from above and below are attached to a spring receiving bracket 62 fixed to the frame 1. is supported via a vertical support shaft 63. The front end of the front float 6 is pivotally connected to the lower part of the engine 2 so as to be able to swing vertically, and the front end is connected to a reinforcing stay 64 supported between the main transmission case 3 and the rear transmission case 7. The rear part of the float 6 is supported via a bending link 65, and the rod 5
The lower end of 8 is also used as a pivot connection pin for the float 6 and the bending link 65. The vertical swing of the front float 6 relative to the aircraft body is transmitted to the unit 55 via the rod 58, and automatic wheel height control is performed. Incidentally, the rod 58 can be freely shortened via a strong spring 58' in order to absorb a stroke exceeding its upward limit.

In other words, when the wheels 8, 8 are set at an appropriate height relative to the hard bed of a paddy field and are traveling for planting, when the hard bed reaches a deep place, the entire body of the machine descends as the wheels 8 sink, causing muddy soil. The front float 6 floating above the plane swings upward relative to the fuselage, and the L-shaped arm 57 attempts to swing upward via the rod 58. When the ground pressure of the front float 6 exceeds a certain value, the L-shaped arm 57 swings upward against the pressure setting spring 60, and as a result, the spool 56 is pulled out and wheel lowering control is performed. The L-shaped arm 57 swings in the opposite direction due to the lifting of the body as the wheels descend, and the spool 56 moves to the neutral side, stopping the wheels 8, 8 from descending.

On the other hand, when the hard ground becomes shallow, the wheels 8 push up, causing the entire aircraft to rise, and the front float 6, which floats above the mud surface, descends under its own weight relative to the aircraft, and as a result, The L-shaped arm 57 has a backlash absorbing spring 6
The spool 56 swings downward against this, and the spool 56 returns to neutral due to the lowering of the body as the wheels rise, and the upward control is stopped.

Further, the spool 56 can be operated manually. That is, another L-shaped operating arm 66 is rotatably supported on the pivot portion of the L-shaped arm 57, and one side of the L-shaped arm 57 is brought into contact with one side of this operating arm 66 from below. A supportable deflection piece 66' is formed. This operating arm 66 is linked via a release wire 67 to a wheel lifting/lowering operating lever 68 at the rear of the machine body. When this lever 68 swings forward, it loosens the wire 67, freeing the operating arm 66, and
When the vehicle swings rearward, the operating arm 66 is forced to swing, and the L-shaped arm 57 can be swinged toward the wheel lowering operation side via the bending piece 66'. Therefore, by keeping the operating lever 68 swinging forward during planting travel, the automatic wheel height control described above is performed to cause the wheels 8, 8 to follow the hard platen, and
When traveling on the road, by holding the operating lever 68 in a swinging position backwards, the wheels 8, 8 are lowered to their lowering limits, and the body is lifted significantly.

Further, as shown in FIGS. 11 and 12, the wheel lifting operation lever 68 is configured to be able to swing laterally about a fulcrum Q, and two swinging operation paths X and Y are connected to the operation box 69. The control lever 68 is provided on the upper surface, and in the path ing.

In other words, by positioning the operating lever 68 in the path Y, it is possible to synchronize the wheel elevation and the planting clutch on/off, and when one of the operating lever 68 or the planting clutch lever 42 is assisted forward, the other is also operated in the same direction. When the planting clutch 19 is engaged, the vehicle becomes in a state where the vehicle wheels are raised and lowered, and planting travel is possible, and when operated rearward, the planting clutch 19 is disengaged and the wheels 8, 8 are forced to descend to the lower limit. It is.

The operation box 69 also has a main clutch operation arm 71 installed inside the main transmission case 3.
The main clutch lever 7 is connected to the main clutch lever 7 by a wire 72.
3, and a speed change lever 75 which is connected to a speed change mechanism inside the main transmission case 3 via a rod 74. Further, near the front part of the frame 1, a pin 76 provided on one side of the wheel control L-shaped arm 57 is engaged from above to move the arm 57 upward from the neutral position, that is, to the wheel lowering control side. A restraining arm 77 is attached and urged in the engagement/disengagement direction, and this restraining arm 77 is linked to the main clutch lever 73 via a wire 78. When the main clutch lever 73 is moved forward and operated, the wire 78 is loosened and the check arm 77 is removed from the pin 76, and when the main clutch lever 73 is turned backward, the check arm 77 is connected to the pin 76. linked to engage. This prevents the wheels 8, 8 from falling unexpectedly when the main clutch is disengaged and the vehicle stops traveling. In other words, while driving in the rice fields, the propulsion reverse torque of the wheels 8 and 8 is transmitted to the aircraft, and the aircraft receives a backward downward moment.In this state, the overall weight balance is adjusted to maintain the longitudinal balance of the aircraft. Therefore, when the propulsion reverse torque disappears due to stopping of traveling, the aircraft becomes forward balanced and leans forward, which causes the ground pressure of the front float 6 to increase and wheel lowering control is performed. . Therefore, by adopting the above mechanism, it is possible to check and prevent wheel lowering control at the same time as the main clutch is disengaged, thereby preventing the aircraft from rising unexpectedly.

Next, the attached mechanism will be explained.

The rear part of the rear float 7 is pivotally supported by a bracket 79 that is vertically swingable around a fixed fulcrum R. This bracket 79 is connected to the rear float 7 by selecting multiple engagements between a fixing pin 80 and a locking arm 81. The planting depth can be adjusted by changing the height relative to the seedling planting device 4.

A marker 82 is attached to the front part of the rear float 7 to visually check the distance between the seedlings and the seedlings that have already been planted, and a line marker 83 is attached to the control handle 5 to form a running reference line for the next stroke on the mud surface. An egress/retreat operation lever 84 is provided.

A spare seedling stand 85 is provided at the center of the front part of the machine body so as to be rotatable about the vertical axis S. As shown in FIGS. 13 and 14, the details are as shown in FIG.
At the same time, the center boss 88 of the preliminary seedling resting table 85 is fitted freely around the outside, and the locking pin 89 attached to the lower surface of the preliminary seedling resting table 85 is engaged with the locking hole 91 provided in the cylindrical part 90 on the bracket 86. The locking pin 89 is urged in the locking direction by a spring 92, and the locking pin 89 is connected to a lock release lever 93 provided at the rear of the stand 85. has been done.
A recess 94 for engaging a lock pin is formed in the cylindrical portion 90 symmetrically with the lock hole 91, so that the stand 85 can be rotated 180 degrees and held in position when replenishing seedlings. Further, the preliminary seedling stand 85 is constructed by attaching a plate material 85b such as synthetic resin or iron plate to a pipe frame 85a configured in a rectangular loop shape in plan view, and a line marker 83 is provided at the left and right center of the front end of the pipe frame 85a. A post 95 is erected for aiming at the reference line formed by.

The left and right grips of the operating handle 5 are equipped with steering clutch levers 96, 96, and an accelerator lever 97 is provided near one of the grips.
The operation box 69 is also equipped with an engine stop switch 98. Further, the upper parts of the engine 2, the main transmission case 3, and the wheel suspension mechanism are covered with a pair of front and rear bonnets 99a and 99b. Moreover, leveling plates 100, 100 are attached to the lower part of the seedling planting device 4 for leveling the tracks left by the wheels 8, 8.

[Brief explanation of drawings]

The drawings illustrate embodiments of the rice transplanter according to the present invention, FIG. 1 is an overall side view, FIG. 2 is an overall plan view,
Figure 3 is a partially cutaway plan view of the rear transmission case, Figure 4 is its front view, Figure 5 is a plan view of the wheel suspension structure, Figure 6 is its side view, and Figure 7 is its front view. Figure 5 is a cross-sectional view, Figure 8 is a plan view of the wheel lift control unit, Figure 9 is a side view thereof, Figure 10 is a side view of the seedling planting device, and Figure 11 is the back of the operation box unit. 12 is a plan view showing a part of the operating lever path, FIG. 13 is a partial plan view of the preliminary seedling stand,
FIG. 14 is a longitudinal sectional side view of the preliminary seedling stand. 6...front float, 6'...ground leveling section, 7...rear float, 7'...ground leveling section, 8...travel wheel.

Claims (1)

[Claims] 1. At the front central position of the pair of left and right running wheels 8, 8, with the rear end edge located in front of the axle of the running wheels 8, 8, a change in ground pressure due to a change in the depth of the plowing ground is detected. A front float 6 is provided as a sensor for automatically controlling the raising and lowering of the wheels 8, 8, and a pair of left and right rear floats 7, 7 are provided at the rear lateral outside positions of the wheels 8, 8, A four-row planting mechanism 11 is temporarily installed between the floats 7, 7, and on both left and right sides of the front float 6, soil leveling sections 6', 6' for the central two-row planting site are provided in succession. Along with the rear float 7,
A walk-behind rice transplanter characterized in that each inner side of the rice transplanter 7 is provided with soil leveling parts 7' and 7' for two outer rows of planned planting locations, respectively.