JPH038B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a hydraulic lifting device in a so-called one-wheel type rice transplanter equipped with one running wheel.

[Conventional technology and its problems]

A rear tilting seedling stand and a pair of left and right operation handles are provided at the rear of the fuselage frame, which has a pair of left and right side frames extending rearward from the transmission case at the front. For example, a one-wheel type rice transplanter is constructed by disposing a swing case pivotally connected to the transmission case so as to extend rearward, and mounting one running wheel on the side surface of the rear end of the swing case. Showa 57-
It has been well known from the past as described in Japanese Patent No. 25527 and the like.

This conventional single-wheel rice transplanter has a structure in which a swing case and hydraulic cylinders for moving the swing case up and down are arranged on both sides of the running wheel. The hydraulic cylinder for lifting and lowering is configured to be adjacent to the running wheels that rotate while buried in mud, and a large amount of mud thrown up by the running wheels may adhere to the hydraulic cylinder. This leads to a decrease in the durability of the hydraulic cylinder, and if the hydraulic cylinder is arranged adjacent to the running wheels, the length of the connecting member or link mechanism that connects the hydraulic cylinder and the swing case will inevitably increase. Since the length of the rice transplanter increases, the swing angle when rotating the swing case in the vertical direction, that is, the vertical height of the machine body, is restricted, and the weight of the rice transplanter is reduced due to the increased rigidity of the connecting member or link mechanism. It was warm because it increased.

The present invention aims to solve the above-mentioned conventional problems when lifting and lowering a one-wheeled rice transplanter using a hydraulic cylinder.

[Means for Solving the Problem] In order to achieve this object, the present invention includes a rear-tilting seedling stand and a rear-tilting seedling stand at the rear of the fuselage frame, which is equipped with a pair of left and right side frames extending rearward from a transmission case at the front. a pair of left and right operation handles are provided, and a swing case having a front end pivotally connected to the transmission case is disposed between the both side frames so as to extend rearward, and on a side surface of the rear end of the swing case, In a one-wheel type rice transplanter equipped with one running wheel, a hydraulic cylinder for vertically moving the swing case is installed on the side opposite to the side to which the running wheel is attached, of both left and right sides of the swing case. The structure is such that it is disposed between the side surface and one of the side frames located outside of the side surface.

[Action/effect of the invention]

In this way, the hydraulic cylinders for vertically moving the swing case are installed on the left and right sides of the swing case opposite to the side to which the running wheels are attached, and on one of the side frames located outside the side. If the configuration is such that the swing case is present between the hydraulic cylinder and the running wheels, it is possible to reduce mud thrown up by the running wheels from adhering to the hydraulic cylinders. Furthermore, since the hydraulic cylinder is adjacent to the swing case, the length of the connecting member or link mechanism that connects the hydraulic cylinder and the swing arm is shortened.

Therefore, according to the present invention, the durability of the hydraulic cylinder can be improved, and the swing angle when rotating the swing case in the vertical direction, that is,
The vertical height of the aircraft can be increased, and
This has the effect of reducing the weight of the rice transplanter.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 indicates a body frame of a rice transplanter, and the body frame 1 has an engine 2 on the top surface.
The transmission case 3 has a U-shape in plan, consisting of a transmission case 3 to which the transmission case 3 is attached, and a pair of left and right hollow side frames 4 and 5 extending rearward from both left and right ends of the transmission case 3. A swing case 6 extending rearward between both side frames 4 and 5
The front end of the swing case 6 is rotatably pivoted, and one running wheel 7 located on the center line in the width direction of the fuselage frame 1 is provided on the side surface of the rear end of the swing case 6. It is rotationally driven from the engine 2 via a transmission case 3 and a chain (not shown) in a swing case 6.

Seedling planting cases 8 and 9 are fixed to the rear ends of both the side frames 4 and 5, respectively, and the two seedling planting cases 8 and 9 are connected by a gate-shaped connecting frame 10 to form a whole. Furthermore, the base end of a lever 11 is rotatably attached to the inner surface of one of the side frames 5 by a pin 12, and the tip of the lever 11 has the swing The tip of the piston rod 16 of the piston 15 in the hydraulic cylinder 14 is disposed between the case 6 and one of the side frames 5 and whose base end is pivotally connected to the front end of the side frame 5 with a pin 13. An arm 18 is pivotally connected at 17 and protrudes from the tip of the lever 11 and the swing case 6.
By connecting between the wheels 7 through the link 19, the traveling wheels 7
By moving the rice transplanter up and down, the entire rice transplanter can be raised and lowered.

Reference numerals 20 and 21 in the figure indicate a pair of left and right operation handles extending rearward from the seedling planting cases 8 and 9, and the operation handles 20 and 21 are bent in an upwardly inclined shape, and the inclined portions thereof are bent upwardly. On the top surface, there is a rear-tilting seedling stand 2 supported movably in the left and right lateral directions by a guide rail 22 and a rail mechanism 23 mounted horizontally between both handles 20 and 21.
4 is provided, and both seedling planting cases 8 and 9 are provided.
On the inner side thereof, swinging seedling planting mechanisms 26 and 27 that reciprocate between the seedling take-out port in the guide rail 22 at the lower end of the seedling platform 24 and the field scene 25 are provided.

Further, reference numerals 28 and 29 in the figure refer to the traveling wheels 7.
The figure shows a pair of left and right floats located on both the left and right sides of the floats 28 and 29, the rear parts of which are attached to the bases of the handles 20 and 21 via the planting depth adjustment mechanism 30, and the front ends of which are attached to both side frames. 4,
5 through links 31 so as to be independently vertically movable.

Further, reference numeral 32 in the figure indicates a rotary type 4-port 3-position hydraulic switching valve attached to the side surface of the transmission case 3, and the engine 2 is connected to the pump port P of the hydraulic switching valve 32 via a circuit 33. Connect a hydraulic pump 34 driven by port A
is connected to the piston rear chamber 15' of the hydraulic cylinder 14 through a circuit 35, and port B is connected to the piston front chamber 15' of the hydraulic cylinder 14 through a circuit 36, so that the spool 37 of the hydraulic switching valve 32 is in the neutral state. When in this position, ports A and B are both closed, ports P and R communicate through the through hole 37', the operation of the hydraulic cylinder 14 is stopped, and the spool 37 is rotated counterclockwise as indicated by arrow a. For example, port P is switched to communicate with port A, port B is switched to communicate with port R, and the piston 15 moves to protrude from inside the hydraulic cylinder 14, thereby lowering the traveling wheels 7, that is, raising the aircraft body. When the spool 37 rotates in the clockwise direction of arrow b, port A is switched to communicate with port R and port B is communicated with port P, and the piston 15 retreats, causing the traveling wheel 7 to rise. It is configured to move, that is, to lower the aircraft.

Further, reference numeral 38 indicates a control shaft disposed in a space on the rear side of the engine 2 so as to extend in a direction substantially perpendicular to the traveling direction of the rice transplanter. The control shaft 38 is rotatably supported on the upper surface via bearings 39, 39, and the base end of a substantially triangular control link 40 is rotatably fitted into one end of the control shaft 38, and the front end of the control link 40 and the When the control link 40 is in the position shown by the solid line in FIG. The oil pressure switching valve 32 is then switched to raise the fuselage, and by clockwise rotation of the control link 40, the oil pressure selector valve 32 is connected via the rod 42 so as to switch to lower the fuselage. Furthermore, a pin 43 extending toward the control link 40 in substantially parallel to the axial direction of the control shaft 38 is fixed to the control shaft 38, and the tip of the pin 43 is brought into contact with the back surface of the control link 40. 43
A spring 44 is installed between the control link 40 and the control link 40 to press the control link 40 against the pin 43.

On the other hand, base ends of a pair of left and right levers 45 and 46, which are disposed so as to extend rearward on both left and right outer sides of the running wheels 7, are rotatably fitted into both ends of the control shaft 38. The tips of both levers 45, 46,
The pair of left and right floats 28 and 29 are connected via rods 47 and 48, respectively. Further, a pin shaft 49 is provided on the control shaft 38 at a portion between both the levers 45 and 46 and protrudes backward.
The control shaft 38 is rotatably fitted onto the boss 50.
By fixing a balance shaft 51 extending substantially parallel to the levers 45 and 46, and inserting and engaging both ends of the balance shaft 51 into long slot holes 45' and 46' formed in the middle of the levers 45 and 46, respectively. Both ends of the balance shaft 51 and the left and right floats 28, 29 are connected to both floats 28,
Both ends of the balance shaft 51 are linked to move up and down in conjunction with the up and down movement of the lever 28.

Further, 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 of the rod slides onto a pin 54 protruding from the side surface of the control link 40. A support bracket 5 attached to the portal frame 10 has a shaft portion 55 that freely engages and is fixed to the proximal end of the manual operating rod 52.
The manual operation rod 52 is slidably inserted into the round hole 57 of No. 6 and has a grip portion 58 at its tip.
is held by a spring 59 provided between the support bracket 56 and the shaft portion 55 so that the pin 54 of the control link 40 is located approximately in the middle of the slotted hole portion 53 when the hydraulic switching valve 32 is in the neutral position. On the other hand, the support bracket 56 is provided with a slot 60 that communicates with the round hole 57, and when the manual operation lever 52 is pulled backward in the direction of arrow c, the hydraulic switching valve 32 is switched to raise the aircraft via the control link 40. In addition, by fitting the constricted portion 61 of the shaft portion 55 into the slot 66 at the rearwardly pulled position, the rearwardly pulled position can be maintained.

In this configuration, the seedlings are supplied onto the seedling stand 24, and when the engine 2 is started, the running wheels 7,
By driving both seedling planting mechanisms 26, 27 and the seedling platform 24, the seedling pine on the seedling platform 24 is divided into individual plants by the vertically swinging seedling planting mechanisms 26, 27 while the rice transplanter is moving forward. After that, the float 28,
After the land has been leveled in step 29, the seeds are planted in two rows in the field 25.

When the plowing depth increases during this rice planting work,
As the aircraft descends to approach the field scene 25, the planting depth of the seedlings in the field scene 25 becomes deeper, but then both floats 28 and 19 that touch down on the field scene 25
approaches the fuselage and both levers 45 and 46 are simultaneously rotated upward via rods 47 and 48, so that the balance shaft 51, whose ends are locked to both levers 45 and 46, can be rotated around the pin shaft 49. First, therefore, the control shaft 38 having the pin shaft 49 rotates counterclockwise, and the control link 40 and the spool 37 of the hydraulic switching valve 32 rotate in the direction of raising the body as indicated by arrow a. At this time, the rising distance l of both floats 28 and 29 to the aircraft body
However, if the spool 37 in the hydraulic switching valve 32 is within the valve stroke L from the neutral position to the aircraft up position or the aircraft down position, the hydraulic switching valve 32 will not switch to the aircraft up position, but l will be L. When the pressure is exceeded, the hydraulic switching valve 32 switches to raise the aircraft.
Since hydraulic pressure is sent from port A to the piston rear chamber 15' of the hydraulic cylinder 14 and the traveling wheels 7 move downward, the machine body rises above the field scene 25.
The seedlings are returned to the original planting depth, and when the plowing depth becomes shallower, the machine becomes higher and moves away from the field scene 25, and the planting depth of the seedlings in the field scene 25 becomes shallower. Both floats 28 and 29 that are in contact with the field 25 are separated from the machine body, and both levers 45 and 46 are simultaneously rotated downward, so that the control shaft 38, control link 40, and hydraulic switching valve 32 are moved in a clockwise direction to lower the machine body. When the lowering distance l of both floats 28 and 29 with respect to the fuselage exceeds the valve stroke L, the hydraulic switching valve 32 switches to the lower position of the fuselage, and a port is opened in the piston front chamber 15'' of the hydraulic cylinder 14. Hydraulic pressure is sent from B to move the wheels 7 upward, which lowers the machine relative to the field, returning the seedlings to the original planting depth. It is possible to automatically control the planting depth so that it remains approximately constant.

During the rice planting work, both floats 2
Only the float on one side of the floats 8 and 29, for example, the right float 29, moves up and down depending on the roughness of the field 25, and the right lever 46, which is linked to the right float 29 through a rod 48, moves up and down. When the right lever 46 moves up and down, only about half of the movement is transmitted to the control shaft 38 due to the swinging of the balance shaft 51. In other words, the up and down movement of the right float 29 is transmitted to the control shaft 38 due to the swinging of the balance shaft 51. , 29 move up and down at the same time, the hydraulic switching valve 32 will not raise the aircraft from the neutral position unless it exceeds a height 2l which is approximately twice the rising or descending height l when switching the hydraulic switching valve 32 from the neutral position. Or, since the machine does not switch to lowering, even if the float on one side moves up and down due to relatively small irregularities in the field, it will not be raised or lowered accordingly. There is nothing to do, and both floats 28, 2
Only when the robots 9 move up and down above a certain level at the same time, the aircraft 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, if both 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, both levers 4
5 and 46, the balance shaft 51 only swings about the pin shaft 49 as shown by the dashed line and the dashed double dotted line in FIG. The valve 32 is not switched and the aircraft 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 turned off.
By pulling in the direction of arrow c and fitting and locking the constricted portion 61 of the shaft portion 55 into the slot 60 of the support bracket 56, the control link 40 and the spool 37 of the hydraulic switching valve 32 move in the direction of the arrow a. By rotating clockwise, the hydraulic switching valve 32 switches to raise the aircraft, allowing the aircraft to rise significantly and turn the aircraft. When this turning is completed, the manual operating rod 52 is moved against the support bracket 56. By releasing the lock, the original automatic control is restored and the machine is automatically controlled to a constant height relative to the field.

[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, FIG. 3 is a perspective view of the lifting device, and FIG. 4 is an enlarged view of the lifting control unit. ,
5 is a cross-sectional view of FIG. 4, FIG. 6 is a cross-sectional view of FIG. 5, FIG. 7 is a cross-sectional view of FIG. 5, and FIG. 8 is a cross-sectional view of FIG. 4. It is. 1...Aircraft frame, 2...Engine, 3...
Transmission case, 4, 5...Side frame, 6...
Swing case, 7... Running wheel, 14... Hydraulic cylinder, 15... Piston, 16... Piston rod, 28, 29... Float, 11... Lever, 18... Arm, 19... Link, 32...
Hydraulic switching valve.

Claims (1)

[Claims] 1. A rear tilting seedling stand and a pair of left and right operation handles are provided at the rear of the fuselage frame, which is equipped with a pair of left and right side frames extending rearward from the transmission case at the front, and between the two side frames,
A single-wheel rice transplanter comprising: a swing case whose front end is pivotally connected to the transmission case; arranged to extend rearward; and one running wheel mounted on the side surface of the rear end of the swing case; A hydraulic cylinder for moving the case up and down is located between the left and right sides of the swing case opposite to the side to which the running wheels are attached and one of the side frames located outside of the side. A hydraulic lifting device for a single-wheel rice transplanter, characterized in that it is arranged in a.