JPS6314587Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an operating device for raising and lowering the body of a rice transplanter by moving wheels attached to the body up and down. More specifically, the height of the body is automatically adjusted to a constant level in response to unevenness in the tillage pan and field surface during rice planting work, while the body is also configured to be raised and lowered using a manual lifting lever.The device is configured so that when the rice transplanter is turned around the edge of a paddy field, the manual lifting lever will not lower the body when the seedling planting device is stopped, so that the body can be raised to the height that is easiest for turning when turning.

Next, an example of the present invention will be explained with reference to the drawings.
In the figure, 1 comprises a fuselage 6 in which a frame 4 of an engine 3 is connected to the front of a transmission case 2 and a transmission case 5 is connected to the rear via a cylindrical frame 5', and a float 7 is provided on the lower surface of the fuselage 6. A rice transplanter is shown that runs in the direction of arrow A on a pair of left and right wheels 9, 9, and a seedling stand 10 and 4 are installed at the rear end of the transmission case 5.
It is equipped with a seedling planting device 12 consisting of two planting mechanisms 11, a pair of control handles 13, and floats 8, 8 on the outside of wheels 9, 9, each of which floats 7, 8, 8. The rear end is attached to the handle 13 and other parts of the machine so that its height can be adjusted using a seedling depth adjustment rod 24, and the front end of the center float 7 is attached to the bottom surface of the tip of the frame 4 via a link 27 for vertical movement. The tips of the outer floats 8, 8 are also attached via links 32, 32 to the tips of horizontal bars 31, 31 which protrude laterally from the body 6 so as to be movable up and down.

The two wheels 9, 9 are connected to the transmission case 2.
are respectively attached to the tips of swing arms 14, 14 which are rotatably attached to a boss 15 at the base thereof,
The engine 3 is rotatably driven by the transmission case 2 through a chain in the arm, etc., which is transmitted by a belt 16 from the engine 3.
A hydraulic pump 18 is provided which is driven by a belt 17.

Bell crank type lifting levers 19, 19 are provided on both left and right sides of the mission case 2, rotatably inserted into a shaft 20 which is supported through the mission case 2. A single-acting hydraulic cylinder 22 is connected to the swing arms 14, 14 through rods 21, 21, respectively, and a single-acting hydraulic cylinder 22 is installed in the frame 4 of the engine 3, and its piston 23 is connected to the front along the center line of the rice transplanter 1. The central part of a swinging rod 25 is pivoted to the tip of the piston 23 so as to be horizontally swingable, and both ends of the swinging rod 25 are connected to the two lifting levers 1.
The wheels 9 and 9 are connected to the other ends of the frame 4 via connecting rods 28 and 28, respectively, so that the wheels 9 and 9 can move up and down in opposite directions.
A body upper limit stopper 29, 29, which the swinging rod 25 comes into contact with when the piston 23 is at its maximum stroke, is provided at the tip, and a body lower limit stopper 30, which the swinging rod 25 comes into contact with when the piston 23 is in the retracted position, at the rear end.
30 respectively, the hydraulic pump 18 is provided with a 4-port 3-position switching valve 33, the hydraulic pump 18 is connected to the pump port P via a circuit 36, and the port A is connected to the hydraulic pressure via a circuit 37. Connect return ports R ₁ and R ₂ to the inlet port 22' of the cylinder 22 and the oil tank 39, respectively,
When the spool 41 in the switching valve 33 is in the neutral position, ports A and R ₁ are closed and ports P and R ₂ are in communication with each other, and when the spool 41 moves toward the front of the aircraft, ports R ₁ and R ₂ are closed. When the spool 41 is moved to the rear of the aircraft, ports P and R ₂ and A and R ₁ are connected to each other and the aircraft is lowered. , and a port 3 provided on the side surface of the tip end of the hydraulic cylinder 22.
4 are connected to the oil tanks 39 of the hydraulic pump 18 through pipes 38, and an L-shaped passage 35 is provided at the end of the piston 23 to communicate the bottom and side surfaces of the end of the piston 23. The opening on the side of the piston of the shaped passage 35 is provided with a relief port 40 which begins to open into the port 34 before the piston 23 reaches its maximum stroke.

Reference numeral 42 denotes a sensor which is pivoted by a pin 43 at the lower part of the frame 4 of the fuselage 6, and the sensor 42 is configured such that its tip is brought into contact with the upper surface of the center float 7 by means of a coiled spring or the like wound around the base end pin 43. energized. Reference numeral 45 denotes a pin pivotally supported above the switching valve 33. An arm 46 that engages with the spool 41 of the switching valve 33 and a bell crank lever 47 are fixed to the pin 45, and one end of the bell crank lever 47 and the sensor are fixed to the pin 45. 42 and the sensor 42
When the sensor rotates downward, the switching valve 33 switches to lower the aircraft, and when the sensor rotates upward, the switch switches to raise the aircraft.
A manual lift lever 4 having the other end of a bell crank lever 47 pivoted to a pin 44 at an appropriate location such as the control handle 13 so as to be rotatable in the longitudinal direction of the fuselage 6.
9, the rod 50, link 51, rod 52, and Arm 53
Connect via.

The manual lift lever 49 has the base end member 5 of the arm 53 rotatably fitted on the pivot pin 44 thereof.
A pin 55 is pivotally attached to the arm 53 so as to be rotatable in the lateral direction, while a protrusion 56 is provided on the side surface of the elevating lever 49, and a pin 57 is pivotally attached to the proximal end member 54 of the arm 53 with respect to the protrusion 56. Clutch plate 58 with spring 5
9, and when the lifting lever 49 is rotated in the horizontal direction, the projection 56 is in the fixed position where it fits into the recess 58' of the clutch plate 58, and the projection 56 is in the recess 5.
8″ automatic position and the protrusion 56 fits into the recess 58
The guide plate 60 is configured to lock the elevator lever at three interlocking positions that fit into the guide plate 60.
is provided with lateral grooves 61, 62, 63 into which the elevator lever 49 is fitted and locked when the elevator lever 49 is raised and rotated laterally in the neutral position and lowered position to the fixed position. .

Note that when the manual lift lever 49 is in the machine-up position, the sensor 42 that is linked to it comes into contact with the lower surface of the frame 4, while when the manual lift lever 49 is in the machine-down position, the sensor 42 and the bell crank lever are in contact with the lower surface of the frame 4. 45 is compressed by the bending deformation of a spring 48' provided in the middle to prevent the sensor 42 from being excessively pressed against the float 7, and also to rotate the manual lift lever 49 to the body lowering position. In other words, it is configured so that the manual lift lever 49 can move the body up and down with priority over the vertical movement of the body by the sensor 42.

The seedling platform 10 of the seedling planting device 12 is attached to the operating handle 13 via a guide rail 64 so as to be able to move laterally, and the power of the engine 3 is transmitted to the transmission case 5 within the cylindrical frame 5'. axis 6
5 and a pair of bevel gears 66 and 67, an intermediate shaft 69 with a planting clutch mechanism 68 (details will be described later), a main shaft 71 to which a chain 70 is transmitted from the intermediate shaft 69, and a speed change from the main shaft 71. A camshaft 73 to which power is transmitted via a gear mechanism 72,
Brackets 74, 74 are each pivoted at right angles to the machine body, and both ends are attached to the front surface of the seedling stand 10.
The feed shaft 75 that comes into contact with the inner surface of the cam shaft 73
A boat-shaped sliding key 77 fixed to the feed shaft 75 is engaged with a reciprocating screw groove 76 provided on the outer periphery of the cam shaft 73 so as to be freely slidable in parallel with the cam shaft 73, and the rotation of the cam shaft 73 causes the seedling platform 10 to be moved left and right. It is configured to reciprocate and cross feed.

Both ends of the main shaft 71 inside the transmission case 5 protrude from both sides of the case, and tubular horizontal members 78, 78 extending laterally are fastened to the side surfaces of the case around the projecting ends. Members 78, 78
Chain cases 79, 79 whose lower ends are inclined toward the front of the fuselage are respectively fixed to the tips of the transmission case 5 and the lower ends of both chain cases 79, 79 and the transmission case 5.
The pawl shafts 80, 80, 81 are arranged on the same axis perpendicular to the machine body at the lower part of the transmission case 5, and the pawl shafts 80, 80, 81 in the transmission case 5
1 is rotationally driven from an intermediate shaft 69 through a chain 82 and a safety clutch 83, and both chain cases 79,
The pawl shafts 80, 80 in 79 are connected from the main shaft 71 in the transmission case 5 to the transmission shafts 84, 84 in the horizontal members 78, 78 and the chains 85, 8 in the chain case.
5 Furthermore, seedling catchers provided on the guide rail 64 are rotatably driven via safety clutches 86, 86, and are provided at both ends of the pawl shaft 81 in the transmission case 5 and at the inner ends of the pawl shafts 80, 80 in both chain cases 79. Each of the seedling planting mechanisms 11 is provided so as to be able to swing up and down between the outlet and the field.

The planting clutch mechanism 68 includes a bevel gear 6 rotatably fitted loosely onto an intermediate shaft 69 as shown in FIG.
7, a clutch 87 slidably fitted onto the intermediate shaft 69 by spline engagement, and a shifter lever 88 for engaging the clutch 87 and slidingly operating it; A bevel gear 6 attached to the gear 67 and the power transmission shaft 65 from the engine 3
6, while the free-fit bevel gear 67 and clutch 8
Clutch pawls that can engage with each other are provided on the surface facing the shifter lever 88, and a spring 89 fitted on the intermediate shaft 69 presses and biases the clutch 87 in the engaging direction. When the planting clutch lever 90, which can be rotated in the front-rear direction, is interlocked and connected via the flexible cable conduit 91 and the wire 92 inserted therein, the clutch lever 90 is connected to the pivot point of the manual lift lever 49. The attachment pin 44 is provided adjacent to the lift lever 49, one end of a wire 92 in a cable conduit 91 is fixed to this clutch lever 90, and one end of the cable conduit 91 is fixed to the operating handle 13 via a metal fitting 93. The tip of the cable conduit 91 is fixed to a joint piece 95 fixed to the tip of the shifter lever 88 with a pin 94, and the tip of the wire 92 is fixed to a spring 96.
When the planting clutch lever 90 is rotated forward along the guide groove 97 of the guide plate 60, that is, in the same direction as the lifting lever 49 lowering the machine body, The wire 92 becomes loose and the planting clutch mechanism 68 releases the spring 89.
When the clutch lever 90 is turned on by force and the clutch lever 90 is rotated backward to the neutral position of the lift lever 49, the shift lever 88 is rotated against the spring 89 due to the extension and pressure of the cable conduit 91 due to the tension of the wire 92. The planting clutch mechanism 68 is then turned off. However, the guide groove 97 in the guide plate 60 is provided with a lateral groove 98 for locking the clutch lever 90 in the OFF position.

The planting clutch lever 90 has a planar L-shaped interlocking piece 9 on the side surface on the manual lift lever 49 side.
On the other hand, the manual lift lever 49 is provided with a protrusion 100 that comes into contact with the interlocking piece 99 when the lever 49 is in the interlocking position, and the planting clutch lever 90 is turned to the clutch OFF position. If you move it, the elevator lever 4 will move in an interlocking position.
9 is in the neutral position and can be rotated to the up position, but not in the lowered position.

In this configuration, when the manual lift lever 49 is rotated in the forward direction of the aircraft, the switching valve 3
3 switches to lowering the machine where ports P and R ₂ and ports A and R ₁ communicate with each other, and the hydraulic pressure from the hydraulic pump 18 and the hydraulic pressure in the hydraulic cylinder 22 are returned to the oil tank, and the piston 23 of the hydraulic cylinder 22 moves backward due to the weight of the aircraft, and both swing arms 14 rotate upward, causing the aircraft to descend. When the elevator lever 49 is rotated toward the rear of the aircraft, the switching valve 33 switches between ports R ₁ and R _{2 .} is closed and switches to raise the aircraft so that ports P and A communicate with each other, and the hydraulic pressure from the hydraulic pump 18 is sent to the hydraulic cylinder 22, causing its piston 23 to move forward and move both swing arms 1.
4 rotates downward, the aircraft will rise, and if the elevator lever 49 is placed in the middle position above, the switching valve 33 will close ports _R1 and A and close port P.
and _R2 are switched to the neutral position where they communicate with each other, and the hydraulic pressure in and out of the hydraulic cylinder 22 is cut off, so that the lifting and lowering of the aircraft can be stopped at any position. By fitting it into the horizontal groove 62, the machine can be locked in the above-mentioned arbitrary vertical position so that it cannot be raised or lowered even if you let go of the lift lever 49.If the lift lever 49 is fitted into the horizontal groove 63 at the machine raised position,
While the piston 23 protrudes to the maximum and the front surface of the swinging rod 25 contacts the stoppers 29, 29, the relief port 40 of the L-shaped passage 35 in the piston 23 opens to the port 34 to the oil tank 39. The hydraulic pressure continuously sent into the hydraulic cylinder 22 is circulated from the relief port 40 back to the oil tank 39, and the upward motion of the aircraft is automatically stopped at the maximum upward position and held at that position. Since the aircraft is locked in a highly elevated position, it can be driven on the road in this state. In addition, when the elevator lever 49 is fitted into the horizontal groove 61 at the lowered position of the aircraft, the swinging rod 25 is moved to the stopper 30, 30.
After descending until it comes into contact with , it automatically stops at the minimum lowered position.

After the machine has traveled on the road in a highly elevated state, in order to carry it into the field and perform rice planting work, the lift lever 49 is rotated laterally from the maximum raised fixed position of the lateral groove 63 to the automatic position. By releasing your hand at the position, the downward rotation of the sensor 42 causes the switching valve 33 to switch to lowering the aircraft, and the aircraft begins to descend.After the float 7 touches down on the field, the distance between it and the aircraft gradually approaches. Then, when the height of the float and the aircraft body reaches a predetermined height, the sensor 42 comes into contact with the top surface of the float 7.
With the upward rotation, the switching valve 33 is returned to the neutral position, and the machine body stops descending, and the height of the machine body relative to the field can be automatically set to a predetermined height position. Rice planting work is performed by moving the machine forward and turning on the planting clutch mechanism 68 by operating the clutch lever 90 to drive the seedling planting device 12.

While moving forward while performing rice planting work in this state, if the height of the machine relative to the field changes due to unevenness in the plowing plate on which the wheels 9 touch the ground and the field surface on which the float 7 touches the ground, then The downward rotation of the sensor 42 in contact with the float 7 causes the switching valve 33 to switch to lowering the aircraft, returning the aircraft to a predetermined height position, and also changing the height relative to the field scene to become lower. in case of,
The upward rotation of the sensor 42 causes the switching valve 33 to switch to raise the machine and return the machine to a predetermined height position, so that the height of the machine relative to the field surface is automatically brought to a predetermined height position. It can be controlled and adjusted.

To change the direction of the rice transplanter at the edge of a ridge during rice planting work, first stop the seedling planting device 12, raise the machine to change direction, then lower the machine and drive the seedling transplanting device 12 again. However, according to the present invention, the manual lift lever 49 is further rotated laterally from the automatic position to the interlocking position, thereby making it easier to change direction at the edge of a ridge. When the planting clutch lever 90 is rotated backward and fitted into the horizontal groove 98 of the guide groove 97 to stop the seedling planting device 12, the interlocking piece 99 moves the elevator lever 49 in the interlocking position.
The lift lever 49 is returned to the neutral position by contacting the protrusion 100 of the float 7, and the lift lever 49 is prevented from being rotated to the lowered position. By pressing it against the field for an appropriate amount of time, or by operating the manual lift lever 49 to raise the machine body and holding it for an appropriate time and then releasing your hand, the machine will move upward during that time and automatically stop at an appropriate height position. The rice transplanter is rotated in this state because the machine body rises to an appropriate height, and if the planting clutch lever 90 is rotated forward after turning, the seedling transplanter 12 is rotated. At the same time as the lift lever 49 is driven, the holding of the neutral position of the lift lever 49 is released.
Under the action of the sensor 42, the machine automatically descends to a predetermined height and begins rice planting work.

FIG. 11 shows another embodiment, in which a guide groove 97 and a lateral groove 9 of a planting clutch lever 90 are shown.
8 is extended rearward, and after the clutch lever 90 is once operated to the body raising position of the manual lift lever 49 as shown by arrow B, it is fitted and locked in the horizontal groove 98 at the neutral position of the lift lever. By operating the planting clutch lever 90 in the direction of the arrow B, the seedling planting device 12 is stopped, and at the same time, the lift lever 49 is operated to raise the machine body, and then it can be brought to the neutral position, and the machine body can be adjusted to an appropriate height. By operating a single planting clutch lever 90, the seedling planting device can be turned on and off and the machine can be raised and lowered at the same time.

As mentioned above, the hydraulic cylinder for raising and lowering the wheels attached to the body of the rice transplanter so that they can move up and down,
A switching valve is provided to switch between raising the aircraft, neutralizing the aircraft, and lowering the aircraft, and connects the switching valve to a manual lift lever provided at an appropriate location on the aircraft.By rotating the manual lift lever, the switching valve raises the aircraft. A float is attached to the aircraft so that it can be switched between neutral and aircraft lowering, and can move up and down relative to the aircraft.If the height between the float and the aircraft is higher, the aircraft can be lowered, and if the height is lower, the aircraft can be raised. In rice transplanters that are connected to each other so as to be switched between the switching valve and Since the weight of the float is acting in the direction of lowering the machine, when you release the manual lift lever, the switching valve is switched to lower the machine by the weight of the float, the machine descends, and the float moves to the field. This makes it difficult to turn the direction. For this reason, in addition to the inconvenience of having to manually hold the manual lift lever in the aircraft raised position or neutral position, the aircraft may rise much higher than the height required for turning, causing the aircraft to It was too hot because it would make it unstable.

In contrast, the present invention, as mentioned above, uses a hydraulic cylinder to raise and lower the wheels that are movably attached to the body of the rice transplanter, and to switch this into three stages: body up, neutral, and body down. A switching valve is provided, and the switching valve is connected to a manual lift lever provided at an appropriate location on the aircraft so that the switching valve is switched to the aircraft up, neutral, and aircraft down, respectively, by rotation of the manual elevation lever. , and the switching valve is attached to a float that is movable up and down with respect to the aircraft body, and when the height of the float and the aircraft body increases, the switching valve lowers the aircraft, and when the height decreases, the switching valve raises the aircraft. In the rice transplanter, a planting clutch lever for intermittently operating the clutch mechanism of the seedling transplanting device in the rice transplanter is located at a position adjacent to the manual lift lever, and the manual lift lever is rotated. When the planting clutch lever is rotated to approximately the same position as the machine lowering position of the manual lift lever, the clutch is engaged, which is approximately the same as the neutral position of the manual lift lever. The clutch is configured to be disengaged when rotated to the position, and
A means for locking the planting clutch lever at the clutch cutting position of the planting clutch lever is provided, and a planting clutch lever is provided between the manual lifting lever and the planting clutch lever. When the clutch is set to the clutch disengaged position, the manual lift lever rotates from the body lowering position to the neutral position in conjunction with this, and an interlocking mechanism is provided so that the manual lift lever does not enter the body lowering position. When stopping the seedling planting device at the edge of a field and turning the device, if the seedling planting device is stopped by rotating the clutch release of the planting clutch lever, the manual lift lever can be lowered. At the same time as it rotates from the position to the neutral position, the manual lift lever will not lower the machine, so even if you release the manual lift lever when the seedling planting device is stopped by the planting clutch lever. The switching valve will not switch to lower the aircraft, and the aircraft will remain at the raised position corresponding to the operation of the manual lift lever, and the manual lift lever will be held in the aircraft raised position or neutral position by hand. This eliminates the inconvenience of having to hold the float in place, and it also reliably prevents the float from touching the field and making it difficult to turn due to an unexpected descent of the aircraft.

Moreover, the manual lift lever is not held in the machine-raised position in conjunction with the stopping of the seedling device by the planting clutch lever, and the machine is raised by the height corresponding to the operation of the manual lift lever to the machine-raised position. For example, as described in Japanese Patent Application Laid-Open No. 53-117526, when the planting clutch lever is disengaged, the manual lift lever is linked to the clutch disengagement, so that the manual lift lever moves to the body-raised position. To,
This prevents the aircraft from rising unnecessarily, which occurs when the planting clutch lever is in the clutch disengaged position. This prevents the center of gravity of the rice transplanter from moving forward and making the control handle heavier due to the large rise of the machine, and prevents floating seedlings that are likely to occur when the machine descends from an unnecessarily high height to begin rice planting work. The occurrence of this can be reduced.

Therefore, according to the present invention, it is possible to simplify the lifting and lowering operation of the machine when turning in the direction of the edge of a field, etc., and also to accurately raise and lower the machine when turning without causing imbalance of the machine or causing a large number of floating seedlings. It has the advantage of being both effective and reliable.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the rice transplanter, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a perspective view of the lifting device, and FIG. 5 is an enlarged sectional view of FIG. 1,
Fig. 6 is an enlarged sectional view of the planting clutch mechanism, Fig. 7 is an enlarged sectional view of the manual lift lever section, and Fig. 8 is an enlarged sectional view of the planting clutch mechanism.
9 is a cross-sectional view of FIG. 8, FIG. 10 is a cross-sectional view of FIG. 7, and FIG. 11 is another embodiment of FIG. 1...Rice transplanter, 6...Body, 9...Wheels, 7...
... Float, 12 ... Seedling planting device, 22 ... Hydraulic cylinder, 33 ... Switching valve, 49 ... Manual lifting lever, 42 ... Sensor, 60 ... Guide plate, ...
...Fixed position, ...Automatic position, ...Linked position,
68... Planting clutch mechanism, 90... Planting clutch lever.

Claims (1)

[Scope of utility model registration request] A hydraulic cylinder for raising and lowering the wheels attached to the body of the rice transplanter so that they can move up and down is equipped with a switching valve to switch it to three stages: machine up, neutral, and machine down. A switching valve is connected to a manual lift lever provided at an appropriate location so that the rotation of the manual lift lever switches the aircraft to raised, neutral, and lowered, respectively, and the switching valve is connected to a vertical position relative to the aircraft. In a rice transplanter that is connected to a movably mounted float, the switching valve is switched to lower the fuselage when the height of the float and the fuselage increases, and to raise the fuselage when the height decreases. , a planting clutch lever for intermittently operating a clutch mechanism of a seedling transplanting device in a rice transplanter is provided at a position adjacent to the manual lifting lever so as to rotate in the same direction as the rotating direction of the manual lifting lever. The planting clutch lever is configured such that the clutch is engaged when the manual lift lever is rotated to approximately the same position as the aircraft lowering position, and the clutch is disengaged when it is rotated to approximately the same position as the neutral position of the manual lift lever. Further, a means for locking the planting clutch lever at the clutch cutting position of the planting clutch lever is provided, and further, between the manual lifting lever and the planting clutch lever, When the planting clutch lever is set to the clutch disengaged position, the manual lift lever rotates from the machine lowered position to the neutral position in conjunction with this, and an interlocking mechanism is provided that prevents the manual lift lever from entering the machine lowered position. A lifting and lowering operation device for a rice transplanter, which is characterized by: