JPH037B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a device for controlling the height of a so-called one-wheel type rice transplanter with one running wheel to a substantially constant height relative to a field surface. It is something.

[Conventional technology and its problems] Conventionally, the height of the aircraft relative to the field has been reduced by relating the movement of the float that touches the ground to the hydraulic switching valve that raises and lowers the aircraft (in other words, raises and lowers the wheels). The height of the seedlings is controlled to a nearly constant height so that the planting depth of seedlings relative to the field does not change.
As described in Publication No. 55-55030, etc., when there are at least two floats, the movement of one main float is related to the hydraulic switching valve, so the hydraulic switching valve is The switching operation responds sensitively to small irregularities and tilting of the aircraft to the left and right, and as a result of this switching action being performed frequently, the impact associated with the switching action is applied to the aircraft, making it difficult to control the aircraft's height. It was extremely unstable.

Moreover, this tendency for the height control of the machine body to become unstable occurs significantly in so-called single-wheel type rice transplanters that have only one running wheel.

The present invention aims to improve control stability when controlling the height of the machine body in this single-wheel type rice transplanter, as well as simplifying the structure and improving responsiveness when controlling the height of the machine body. The purpose is to

[Means to solve the problem]

In order to achieve this object, the present invention provides a running wheel movable up and down at the rear of the engine disposed on the front upper surface of the fuselage frame, and floats are arranged on both left and right sides of the running wheel. In the one-wheel type rice transplanter, a hydraulic switching valve for switching a hydraulic cylinder for lifting and lowering the running wheels to lifting and lowering the wheels is provided on one side of the body frame, and the body frame includes: A control shaft extending in a direction substantially perpendicular to the direction of movement of the rice transplanter is rotatably supported, and a midway portion of a balance shaft extending substantially parallel to the control shaft is rotatably pivoted to a pin shaft protruding from the control shaft. Both ends of the balance shaft and the left and right floats are linked via link mechanisms such that both ends of the balance shaft move up and down in conjunction with the up and down movement of both floats, and The end portion closer to the hydraulic switching valve and the hydraulic switching valve are configured to be related to each other so that the hydraulic switching valve is switched by forward and reverse rotation of the control shaft.

〔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 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. From transmission case 3
The chain inside the swing case 6 (not shown)
Rotationally driven via etc.

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 at the midpoint with a pin 12, and the base end The tip of the piston rod 16 of the piston 15 in the hydraulic cylinder 14 is pivotally connected to the front end of the side frame 5 by the pin 13, and the tip of the piston rod 16 is pivotally connected by the pin 17.
By connecting the tip of the lever 11 and the arm 18 protruding from the swing case 6 via a link 19, the traveling wheels 7 are moved up and down by the operation of the hydraulic cylinder 14, thereby moving the entire rice transplanter. It is designed to move up and down.

Reference numerals 20 and 21 in the figure indicate a pair of left and right operating handles extending rearward from the seedling planting cases 8 and 9. On the top surface of the unit, there is a rearward-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.
shows a pair of left and right floats located on the left and right sides of the floats 28 and 29, the rear parts 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,
5 via 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 one side of the transmission case 3 that constitutes a part of the aircraft frame 1, and the pump port P of the hydraulic switching valve 32 A hydraulic pump 34 driven by the engine 2 is connected via a circuit 33 to the piston rear chamber 15' of the hydraulic cylinder 14 via a circuit 35, and port B is connected via a circuit 36 to the piston rear chamber 15' of the hydraulic cylinder 14. Each is connected to the piston front chamber 15' in the hydraulic cylinder 14, and when the spool 37 of the hydraulic switching valve 32 is in the neutral position, ports A and B are both closed and ports P and R are communicated through the through hole 37'. When the hydraulic cylinder 14 stops operating and the spool 37 rotates in the counterclockwise direction of arrow a, port P changes to port A.
Then, ports B are switched to communicate with ports R, and the pistons 15 move to protrude from the hydraulic cylinders 14, causing the traveling wheels 7 to move downward, that is, to raise the body, and the spools 37 to move in the direction of the arrow. By rotating clockwise b, port A is switched to communicate with port R and port B is communicated with port P, and the piston 15 retreats.
It is configured so that the traveling wheels 7 move upward, that is, the body moves downward.

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 by bearings 39 protruding from the upper surface, etc., and the base end of a substantially triangular control link 40 is rotatably fitted to one end of the control shaft 38 near the hydraulic switching valve 38. , when the control link 40 is in the position shown by the solid line in FIG. 40 in the counterclockwise direction, the hydraulic switching valve 32 is switched to raise the aircraft body, and by clockwise rotation of the control link 40, the hydraulic switching valve 32 is switched to the upper position.
is connected via a rod 42 so that the fuselage can be lowered. Further, 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. A spring 44 is mounted between the pin 43 and the control link 40 to bias 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. The levers 45, 46 and the rods 47, 48 move both ends of the balance shaft 51 and the left and right floats 28, 29 in conjunction with the vertical movement of the floats 28, 28, so that both ends of the balance shaft 51 move up and down. Link mechanisms 62 and 63 are configured to link each other so as to move. In this case, both link mechanisms 62 and 63, which are constituted by both levers 45 and 46 and both rods 47 and 48, are arranged between the running wheel 7 and both side frames 4 and 5 in plan view. has been done.

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.

[Action/effect of the invention]

The present invention is configured as described above, so that
It has the following actions and effects.

When one of the two floats was moving up and down and both floats were moving up and down in the opposite direction, the height of the aircraft was hardly controlled due to the swinging of the balance shaft, and both floats moved up and down above a certain level. In this case, the hydraulic switching valve switches from the neutral position to raise or lower the machine to control the height, so the machine does not move up and down minutely in response to small irregularities in the field or the tilt of the machine. , the height of the machine relative to the field, that is, the planting depth of seedlings, can be automatically and stably controlled to a substantially constant level.

The hydraulic switching valve is provided on one side of the fuselage frame, and the control shaft and the hydraulic switching valve are related to each other at the end of the control shaft closer to the hydraulic switching valve, so that the control shaft and the hydraulic switching valve are connected. Since the distance between the valve and the related mechanism is shortened, the structure of the relevant part can be configured extremely simply, making the rice transplanter lighter, and the movement from the control shaft to the hydraulic switching valve can be quickly transmitted. This improves the responsiveness of the aircraft's height control.

[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, 6...
Swing case, 7... Traveling wheel, 14... Hydraulic cylinder, 28, 29... Float, 32... Hydraulic switching valve, 38... Control shaft, 40... Control link, 42... Rod, 49... Pin Axis, 50...
Boss, 51... Balance shaft, 62, 63... Link mechanism, 45, 46... Lever, 47, 48... Rod.

Claims (1)

[Claims] 1. A single-wheel rice transplanter comprising a single running wheel movable up and down at the rear of an engine disposed on the upper front surface of the body frame, and floats arranged on both left and right sides of the running wheel, as described above. A hydraulic switching valve for switching a hydraulic cylinder for raising and lowering the traveling wheels to raising and lowering the wheels is provided on one side of the body frame, while a hydraulic cylinder is provided on one side of the machine frame. A control shaft extending in the direction is rotatably supported, and a midway portion of a take-up shaft extending substantially parallel to the control shaft is rotatably pivoted to a pin shaft protruding from the control shaft, and both ends of the take-up shaft and the Both left and right floats are linked via link mechanisms such that both ends of the balance shaft move up and down in conjunction with the up and down movement of both floats, and an end of the control shaft closer to the hydraulic switching valve; A device for controlling body height in a one-wheeled rice transplanter, characterized in that the hydraulic switching valve is connected to the hydraulic switching valve so that the switching operation is performed by forward and reverse rotation of a control shaft.