JPH039B2 - - 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]

In Utility Model Application Publication No. 55-55030 as prior art,
The hydraulic cylinder is equipped with a hydraulic cylinder that moves up and down the running wheels that support the aircraft frame, and a hydraulic switching valve that switches the hydraulic cylinder to move the aircraft up and down, and the hydraulic switching valve and the float are switched between the hydraulic switching valve and the float by lowering the float. Controlling the height of the aircraft relative to the field to a substantially constant level by linking via a control mechanism such that the valve switches to lower the aircraft, and the hydraulic switching valve switches to raise the aircraft as the float rises; It is described that the hydraulic switching valve is provided with a manual lifting/lowering operation handle which manually switches the hydraulic switching valve to at least lifting of the aircraft body with priority over the control mechanism.

In this device, if you want to maintain the elevated position for a suitable period of time after lifting the aircraft using the manual lifting/lowering operation handle, you must hold the manual lifting/lowering operating handle during that time. be.

In this case, in the case of a two-wheeled rice transplanter equipped with two running wheels, the machine will not tilt to the left or right even if you let go of the pair of left and right control handles. It is relatively easy to hold the operating handle in the raised position of the fuselage.

In the case of a single-wheeled rice transplanter, when you let go of the pair of left and right control handles, the machine immediately tilts to the left or right.In other words, you cannot take your hands off the control handles for a long time. Therefore, the manual lifting operation handle cannot be held in the raised position of the aircraft for a long period of time. This made it extremely difficult to make a directional turn with the aircraft elevated.

The present invention aims to solve this problem, that is, when the prior art described above is applied to a single-wheel rice transplanter, it becomes difficult to turn the single-wheel rice transplanter.

[Means to solve the problem]

In order to achieve this object, the present invention includes a hydraulic cylinder that vertically moves one running wheel that supports the aircraft body, and a hydraulic switching valve that switches the hydraulic cylinder to vertically move the aircraft body. A control device for controlling the height of an aircraft body in which a float is linked via a control mechanism so that when the float descends, the hydraulic switching valve switches to lower the aircraft, and when the float rises, the hydraulic switching valve switches to raise the aircraft. In,
A manual lifting operation handle is provided, which allows the hydraulic switching valve to be manually operated to switch at least to raising the aircraft body in priority to the control mechanism;
a biasing means for biasing the manual lifting operation handle in a direction that permits control by the control mechanism; and a releasably holding the manual lifting operation handle at a raised position of the aircraft body against the urging means. The structure is such that a holding means is provided.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 indicates the body of the rice transplanter;
The fuselage 1 is configured in a U-shape in plan, with a transmission case 3 having an engine 2 attached to its upper surface, 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. The front end of a swing case 6 extending rearward between the side frames 4 and 5 is rotatably attached to the lower side surface of the case 3. One running wheel 7 located on the center line is provided, and this running wheel 7 is rotationally driven from the engine 2 via the transmission case 3 and a chain (not shown) in the 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 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, and the operating handles 20 and 21 are bent in an upwardly inclined shape. A rearward-tilting seedling stand 24 is provided on the top surface of the unit, and is supported by a guide rail 22 and a rail mechanism 23, which are horizontally mounted between the control handles 20 and 21, and is movable laterally to the left and right. Also, on the inside of both the seedling planting cases 8 and 9, there is a swinging type seedling planting device that 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 25. Mechanisms 26 and 27 are provided, respectively.

Further, reference numerals 28 and 29 in the figure refer to the traveling wheels 7.
A pair of left and right floats are shown, which are located on both the left and right sides, and the rear portions of both floats 28 and 29 are attached to the planting depth adjustment mechanism 3 at the base of both the control handles 20 and 21.
0, and the front ends are attached to both side frames 4 and 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 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. 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. pin 4
3 and the control link 40.
A spring 44 is mounted to press the pin 43 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.

Furthermore, reference numeral 52 in the figure is a manual lifting/lowering operation rod for manually lifting/lowering the aircraft, and a long slot 53 provided at the tip thereof is connected to the control link 4.
A shaft portion 55 that is slidably engaged with a pin 54 protruding from the side surface of the 0 and fixed to the base end of the manual lifting operation rod 52 is inserted into the round hole of the holding bracket 56 attached to the gate-shaped frame 10. 57, a manual lifting operation handle 58 is provided at the tip thereof, and the manual lifting operation rod 52 is provided between the holding bracket 56 and the shaft portion 55. 59 biases the pin 54 of the control link 40 to be located approximately in the middle of the long slot hole 53 when the hydraulic switching valve 32 is in the neutral position, while the holding bracket 56 has a circular hole 50 in the holding bracket 56. A communicating slot 60 is provided, and a manual lifting/lowering operation lever 52 is provided.
When pulled backwards in the direction of arrow c against the biasing spring 59, the hydraulic switching valve 32 is switched to raise the aircraft via the control link 40, and in the rearward pulled position, the shaft By removably fitting the constricted portion 61 of the portion 55 into the slot 66, it is configured to be removably held in the rearwardly pulled position, that is, the raised position of the fuselage.

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, 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 simultaneously rotate downward, so that the control shaft 38, control link 40, and hydraulic switching valve 32 move clockwise 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 is switched 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, 27 and the seedling platform 24 are stopped, and the manual lifting operation handle 58 is moved in the direction of arrow C. The control link 40 and the spool 37 of the hydraulic switching valve 32 are pulled against the biasing spring 59 and the constricted portion 61 of the shaft portion 55 is fitted into the slot 60 of the holding bracket 56 and locked. rotates in the counterclockwise direction of arrow a, and the hydraulic switching valve 32 switches to raise the aircraft, allowing the aircraft to rise significantly and make a turn in the direction of the aircraft.When this turning is completed, manual lifting operation is activated. By releasing the handle 58 from the holding bracket 56, the biasing spring 59 returns to the original automatic control, and the machine is automatically controlled to a constant height relative to the field.

[Action/effect of the invention]

The present invention summarizes the configuration described in the claims, and when the rice transplanter turns in the direction,
When the manual lifting operation handle is operated, the machine body can be raised, and the manual lifting operation handle can be held in the raised position of the machine body by the detachable holding means. There is no need to let go of the operating handle for a long period of time, and by simply releasing the manual lifting operating handle from the holding means, the biasing means can automatically control the height of the aircraft. It will automatically return to .

Therefore, the single-wheeled rice transplanter can be operated to turn in a direction with its body elevated, without causing the body to tilt in the left-right direction, making it extremely easy and safe.

[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, 52... Manual lifting operation rod, 58... Manual lifting operation handle, 56... ...Bracket for holding, 59... Spring for urging.

Claims (1)

[Claims] 1.Equipped with a hydraulic cylinder that moves one running wheel that supports the aircraft up and down, and a hydraulic switching valve that switches the hydraulic cylinder to move the aircraft up and down, the hydraulic switching valve and the float are connected by lowering the float. In the aircraft height control device, the hydraulic switching valve is linked via a control mechanism so that the hydraulic switching valve is switched to lower the aircraft, and when the float is raised, the hydraulic switching valve is switched to the lifting of the aircraft. A manual lifting operation handle is provided which, when operated, gives priority to at least the lifting of the aircraft body over the control mechanism, and a biasing mechanism biases the manual lifting operation handle in a direction that allows control by the control mechanism. A one-wheel type rice transplanter characterized in that it is provided with a biasing means and a holding means for detachably holding the manual lifting operation handle at a raised position of the machine body against the biasing means. Control device.