JPS63214108A - Machine body height controller in rice planter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for controlling the height of a rice transplanter relative to a field to be substantially constant.

[Conventional technology and its problems]

Conventionally, the movement of the float that touches the field is linked to a hydraulic circuit that raises and lowers the machine (in other words, raises and lowers the wheels) to control the height of the machine relative to the field at a substantially constant height. The planting depth of seedlings is kept unchanged, but in the conventional method, as described in, for example, Japanese Utility Model Application Publication No. 55-55030, etc., when there are at least two floats, Since the movement of the main float is related to the hydraulic switching valve, the switching valve responds sensitively to small irregularities in the field and tilts of the machine to the left and right, and operates to switch. As a result of the frequent operation, the impact associated with the switching operation was applied to the aircraft body, making the height control of the aircraft extremely unstable.

The present invention aims to solve this problem.

[Means to solve the problem]

In order to achieve this object, the present invention provides a rice transplanter comprising at least one running wheel and at least a pair of right and left floats, in which a hydraulic circuit for the hydraulic cylinder that moves the wheel up and down is provided. A switching valve is provided, and the operation switching valve is connected to a control shaft so as to perform switching operation by forward and reverse rotation of the control shaft, and a pin shaft protruding radially from the control shaft has a pin shaft approximately parallel to the control shaft. The middle part of the balance shaft is rotatably pivoted, and both floats of the rice transplanter are connected to both ends of the balance shaft.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 indicates a body frame of a rice transplanter. A pair of left and right hollow side frames 4.5 extend rearward from both ends, and the transmission case 3 has a U-shaped planar structure, and a swing case 6 is provided on the lower side surface of the transmission case 3 and extends rearward between the side frames 4.5. The front end of the swing case 6 is rotatably pivoted, and a running wheel 7 is provided at the tip of the swing case 6 and is located on the center line in the width direction of the fuselage frame 1. It is rotated through the case 3 and via a chino (not shown) in the swing case 6.

Seedling planting cases 8 and 9 are each fixed to the rear ends of both side frames 4.5, and the two planting cases 8.9 are connected by a gate-shaped connecting frame 10 to complete the entire structure. Furthermore, the base end of a lever 11 is rotatably attached to the inner surface of one of the side frames 5, and the base end is attached to the tip of the lever 11. A piston rear chamber door 16 of a piston 15 in a double-acting hydraulic cylinder 14 pivotally connected to the front end of the frame 5 by a pin 13
The tip of the lever 11 is pivotally attached to the pin 1, and the tip of the lever 11 and the arm 18 protruding from the swing case 6 are connected via a link 19. The entire rice transplanter is raised and lowered by moving the wheels 7 up and down.

Reference numerals 20 and 21 in the figure indicate a pair of left and right operation handles extending rearward from the two image planting cases 8°9, and the operation handles 20 and 21 are bent in an upwardly inclined shape,
On the upper surface of the sloping part, a rear-tilting seedling stand 24 is supported by a guide rail 22 and a rail mechanism 23 mounted horizontally between both handles so as to be movable laterally.
Also, on the inside of the planting cases 8 and 9, a swinging type seedling is provided which moves back and forth between the seedling outlet on the guide rail 22 at the lower end of the seedling platform 24 and the field surface. A planting mechanism 26, 27 is provided in each case.

In addition, the symbols 28 and 29 in the figure are 1. A pair of left and right floats 28 and 29 are shown located on both left and right sides of the running wheel 7, and the rear portions of both floats 28 and 29 are attached to the bases of the handles 20 and 21 via the planting depth adjustment mechanism 30, and the front ends are attached to both side frames 4.degree. 5 via links 31 so as to be able to move up and down independently.

Further, reference numeral 32 in the figure indicates a rotary set of 4-point, 3-position operating switching valve attached to the side surface of the transmission case 3, etc., and a circuit 3 is connected to the pump port P of the operating switching valve 32.
3, a hydraulic pump 34 driven by the engine 2
The boat 1-A is connected to the piston rear chamber 15' of the double-acting hydraulic cylinder 14 through the circuit 35, and the boat B is connected to the piston front chamber 15# of the double-acting hydraulic cylinder 14 through the circuit 36. are respectively connected to the actuation switching valve 32.
When the spools 37 of boats A and B are in the neutral position,
are both closed, ports P and R are connected through the through hole 37', the operation of the hydraulic cylinder 14 is stopped, and the spool 37 is rotated counterclockwise as shown by arrow (a), then port P is closed to the boat. At A, the boat B is switched to communicate with each port R, and the piston 15 moves to protrude from inside the hydraulic cylinder 14, so that the traveling wheels 7 are lowered, that is, the body is raised, and the spool 37 is moved in the direction indicated by the arrow. When rotated clockwise in (b), port A is switched to communicate with boat R and port B is communicated with port P, and the piston 15 moves back, thereby raising the traveling wheels 7, that is, lowering the aircraft body. is configured to be.

Reference numeral 38 denotes a horizontal control shaft which is rotatably supported in a substantially horizontal direction on the rear upper surface of the transmission case 3 through bearings 39 and 39. One end of the control shaft 38 is provided with a substantially triangular control shaft. The base end of the link 40 is rotatably fitted, and the lever 41 attached to the front end of the control link 40 and the spool 37 of the actuation switching valve 32 is in the position where the control link 40 is shown by the solid line in FIG. When the actuation switching valve 32 is in the neutral position, the actuation switching valve 32 is turned on by counterclockwise rotation of the control link 40.
is connected to the control shaft 38 through a loft 42 so that the control link 40 switches to raise the fuselage, and when the control link 40 rotates clockwise, the operation switching valve 32 switches to lower the fuselage. A bottle 43 extending toward the control link 40 is fixed, and the tip of the bottle 43 is brought into contact with the back side of the control link 40. Between the bottle 43 and the control link 40, the control link 40 A spring 44 is mounted on the control shaft 38 to press it against the bottle 43, and the base ends of a pair of left and right levers 45 and 46 are rotatably fitted to both ends of the control shaft 38. The ends of the floats 45, 46 and the pair of left and right floats 28, 29 are connected via rods 47, 48, respectively, and the vertical movement of each float 28, 29 causes each lever 45, 46 to move up and down. The control shaft 38 includes both levers 45 and 46.
A pin shaft 49 is provided protruding perpendicularly between the parts, and a boss 50 rotatably fitted onto the pin shaft 49 has a control shaft 38
By fixing a balance shaft 51 extending parallel to the lever, and inserting and engaging both ends of the balance shaft 51 into long slot holes 45' and 46' drilled in the middle of both levers 45° and 460,
The control shaft 38 is configured to rotate counterclockwise or clockwise by approximately half the angle of the vertical movement of either one of the left and right front levers 45 and 46.

Furthermore, reference numeral 52 in the figure is a manual operation rod for manually raising and lowering the aircraft body, and a long slot 53 provided at the tip thereof is connected to a pin 54 protruding from the side surface of the control link 40.
The shaft portion 55, which is slidably engaged with and fixed to the base end of the manual operation rod 52, is slidably inserted into the round hole 57 of the support bracket 56 attached to the portal frame 10, and the tip thereof is The spring 5 is provided with a grip portion 58 and a manually operated loft 52 is provided between the support bracket 56 and the shaft portion 55.
9 holds the pin 54 of the control link 40 to be located approximately in the middle of the long slot hole 53 when the actuation switching valve 32 is in the neutral position, while the support bracket 56 has a groove communicating with the round hole 57. A hole 60 is provided, and a manual operation lever 52 is provided.
When pulled backwards in the direction of arrow (c), the operation switching valve 32 is configured to switch to raise the aircraft via the control link 40, and in the backwardly pulled position, the constricted portion 61 of the shaft portion 55 is By fitting it into the slot 66, it is configured to be able to maintain the rearwardly pulled position.

In this configuration, a seedling mat is supplied on the seedling platform 24,
By starting the engine 2, the running wheels 7 and both seedling planting mechanisms 26 are
．． 27 and the seedling platform 24, while the rice transplanter is moving forward, the seedling mat on the seedling platform 24 is divided one by one by the vertically swinging seedling planting mechanism 26, 27, and then the seedling mat is placed on the float 28° in advance. Sequentially 2 to the field scene 25 after leveling the ground in 29
Planted along rows.

When the depth of plowing 11 becomes deeper during this rice planting work, the machine lowers closer to the field scene 25, and the depth of planting seedlings in the field scene 25 becomes deeper. Flow) 28, 19 approach the machine body, and both levers 45, 46 simultaneously rotate upward via rods 47, 48, so that the balance shaft 51, which has both ends locked to both levers 45, 46, moves to the bottle shaft 49. The control shaft 38 with the pin shaft 49 is rotated counterclockwise so that the control link 40 and the spool 37 of the switching valve 32 move in the direction of the arrow (a).
Rotate in the direction of raising the aircraft. At this time, both floats 28.
If the ascending path 1i1 (J) to the fuselage of No. 29 is within the valve stroke (L) until the spool 37 in the switching valve 32 is switched from the neutral position to the aircraft raised position or the aircraft lowered position, the operation switching valve 32 does not switch to raise the aircraft, but when <1> exceeds (L), the operation switching valve 32 switches to raise the aircraft, and hydraulic pressure is sent from port (A) to the piston rear chamber 15' of the hydraulic cylinder 14. As the traveling wheels 7 descend, the machine rises above the field scene 25, so that the original planting depth is returned to its original depth.Furthermore, when the plowing depth becomes shallow, the machine moves away from the field scene 25. As the height increases, the planting depth of seedlings in the field scene 25 becomes shallow (but then both floats 28 and 29 that touch the field scene 25 separate from the aircraft body, and both levers 45 and 46 simultaneously move downward. Since it rotates, the control shaft 38, control link 40, and actuation switching valve 32
is rotated clockwise in the aircraft lowering direction, and when the descending distance (1) of both floats 28 and 29 relative to the aircraft exceeds the valve stroke (L), the operation switching valve 32 will not switch to the aircraft lowering position. Piston front chamber 15 of hydraulic cylinder 14
“When the hydraulic pressure is sent from the boat (B) to raise the wheels 7, the machine is lowered relative to the field, and the original planting depth is returned to the depth of the tiller. The planting of seedlings can be automatically controlled so that the depth remains approximately constant despite changes.

During the rice planting work, one of the floats 28 and 29, for example, the right float 29,
When the right lever 46, which is linked to the right float 29 through a rod 48, moves up and down in response to roughness of the field 25, etc., the right lever 46 moves up and down. Due to the swinging of the balance shaft 51, only about half of the movement is transmitted to the control shaft 38. In other words, the vertical movement of the right float 29 is caused by the simultaneous vertical movement of both flows 28 and 29, which causes the operation switching valve 32 to move up and down. The operation switching valve 32 will not switch from the neutral position to raise or lower the aircraft unless the height exceeds approximately twice the height of the rise or fall when switching from the neutral position. Even if the machine moves up and down due to relatively small irregularities in the field, it will not be raised or lowered accordingly.In other words, the machine will not move up and down finely, and both floats 28°29
Only when the two simultaneously move up and down above a certain level, the machine moves up and down in response to this, and its height relative to the field is automatically controlled to a substantially constant value.

In addition, when the left and right floats 28.29 move up and down in opposite directions with respect to the direction of movement of the machine during rice transplanting work, the balance shaft 51 whose ends engage with both levers 45.46 linked thereto As shown in FIG.
, the operation switching valve 32 is not switched and the aircraft body is not raised or lowered.

When the rice transplanting operation has progressed to the edge of the ridge and the rice transplanter is to be rotated, the seedling planting mechanisms 26 and 27 and the seedling platform 24 are stopped, and the manual operation rod 52 is moved in the direction of arrow (C). By pulling the constricted portion 61 of the shaft portion 55 into the slot 60 of the support bracket 56 and locking it, the control link 40 and the spool 37 of the actuation switching valve 32 move as shown by the arrow (a).
The operation switching valve 32 is switched to raise the aircraft by rotating counterclockwise, allowing the aircraft to rise significantly and turn in the direction of the aircraft. When this turning is completed, the manual operating rod 52 is moved to the support bracket. 56 (thereby, the original automatic control is restored and the machine is automatically amed to a constant height relative to the field scene).

FIG. 9 shows another embodiment, in which the levers 45 and 46 of the previous embodiment are not used (a boss 50 rotatably fitted on a pin shaft 49 protruding from a horizontal control shaft 38) is used. At both ends of the balance shaft 51 attached to the
．． 29 are directly connected to the connecting rods 47 and 48. In this case as well, only approximately half of the vertical movement of the float on one side is transmitted to the control shaft 38, so the same effect as described above is performed. be exposed.

[Action/effect of the invention]

According to the present invention, with the above configuration, when one of the two floats moves up and down and both floats move up and down in the opposite direction, the height of the aircraft is not controlled, and both floats move up and down. Only in this case, the operation switching valve switches from the neutral position to raising or lowering the machine and controlling the height, so the machine can move up and down finely in response to small irregularities in the field or the tilt of the machine. (The height of the machine relative to the field surface, that is, the planting depth of seedlings, can be stably and automatically controlled to be approximately constant.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of the rice transplanter, FIG. 2 is a plan view of the rice transplanter, and FIG. 3 is a perspective view of the lifting device.
Figure 4 is an enlarged view of the lift control section, and Figure 5 is V-V in Figure 4.
Figure 6 is a cross-sectional view taken along the line Vl-Vl in Figure 5. Figure 8 is a cross-sectional view taken along ■--■ in Figure 4. Figure 9 is a cross-sectional view taken along ■--■ in Figure 4. FIG. 7 is a perspective view showing another embodiment. 1... Airframe frame, 6... Swing case,
7...Wheel, 14...Hydraulic cylinder, 28.2
9...Float, 32...Operation switching valve, 38...
... Control axis, 40 ... Control link, 42 ...
Rod, 47.48... Rod, 49... Bottle shaft, 50... Boss, 51... Balance shaft. Patent applicant Yanmar Agricultural Machinery Co., Ltd. Figure 7

Claims (1)

[Claims] (1) In a rice transplanter comprising at least one traveling wheel and at least a pair of left and right floats, an operation switching valve for the hydraulic cylinder is provided in the hydraulic circuit to the hydraulic cylinder that moves the wheel up and down, and The operation switching valve is connected to a control shaft so that the switching operation is performed by forward and reverse rotation of the control shaft, and a pin shaft protruding radially from the control shaft has a balance shaft in the middle that is approximately parallel to the control shaft. What is claimed is: 1. A control device for controlling the body height of a rice transplanter, comprising: rotatably pivotally mounted, and both floats of the rice transplanter connected to both ends of the balance shaft.