JPS6238496Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a device that lifts and lowers a rice transplanter when changing direction at the edge of a ridge during rice transplanting work in a field. In configuring the automatic control mechanism to be automatically controlled at a substantially constant level and to be able to manually ascend and descend with priority over this automatic control, the automatic control mechanism and the clutch mechanism of the seedling planting device are connected so that when the clutch mechanism is disconnected, the When the rice transplanter ascends and engages the clutch mechanism, the machine descends, allowing the rice transplanter to move up and down when changing direction, and to turn on and off the seedling planting device.
The operation can be performed extremely simply and easily with a light force using a single lever without compromising the priority of manual lifting.

Next, an example of the present invention will be explained with reference to the drawings.
In the figure, 1 includes a body 6 in which a frame 4 of an engine 3 is connected to the front part of a transmission case 2 and a transmission case 5 is connected to the rear part via a cylindrical frame 5', and a float 7 is provided on the lower surface of the body 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 both outer floats 8, 8 are also attached to the tips of horizontal bars 31, 31 protruding laterally from the body 6 via links 32, 32 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 both lifting levers 1.
The other ends of the frame 4 are connected to the other ends of the frame 4 via connecting rods 28, 28, so that the wheels 9, 9 can be moved up and down in opposite directions. When the piston 23 is at its maximum stroke, the swinging rod 25 comes into contact with the upper limit stoppers 29, 29, and the rear end of the swinging rod 25 contacts the lower end stopper 3.
0 and 30, respectively, while the hydraulic pump 18
is provided with a 4-port 3-position switching valve 33, the hydraulic pump 18 is connected to its pump seat P via a circuit 36, and the port A is connected to the inlet port 22' of the hydraulic cylinder 22 via a circuit 37, and a return valve is connected to the hydraulic pump 18 via a circuit 36. Ports R ₁ and R ₂ are connected to the oil tank 39, and when the spool 41 in the switching valve 33 is in the neutral position, ports A and R ₁ are closed, ports P and R ₂ are in communication with each other, and the spool 41 is closed. If the spool 41 moves to the front of the machine, ports R ₁ and R ₂ will close and ports P and A will communicate with each other, raising the machine. If the spool 41 moves to the rear of the machine, ports P, R ₂ and port A will close. ，
_R1 are configured to communicate with each other to lower the aircraft body, and ports 34 provided on the side surface of the tip end of the hydraulic cylinder 22 are respectively connected to oil tanks 39 in the hydraulic pump 18 via pipes 38, An L-shaped passage 35 is provided at the distal end of the piston 23, and the L-shaped passage 35 communicates between the bottom surface of the distal end and the side surface.
The opening on the side of the piston 5 is provided with a relief port 40 which starts opening into the port 34 before the piston 23 reaches its maximum stroke.

Reference numeral 42 denotes a sensor which is pivotally mounted on a pin 43 at the lower part of the frame 4 of the fuselage 6, and the sensor 42 is arranged so that its tip is brought into contact with the upper surface of the central float 7 by means of a coiled spring 44 and the like wound around the base end pin 43 of the sensor 42. is energized by 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.
One end and the base end of the sensor 42 are connected via a rod 48 so that when the sensor 42 rotates downward, the switching valve 33 switches to lower the body, and when the sensor rotates upward, the switch valve 33 switches to raise the body. On the other hand, the other end of the bell crank lever 47 is attached to a manual lift lever 4 with a pin pivoted to an appropriate location such as the control handle 13 so as to be able to rotate in the longitudinal direction of the fuselage 6.
9, the rod 50, link 51, rod 52, and Arm 53
Connect via.

In this case, when the manual lift lever 49 is placed in the aircraft raised position, the sensor 42 that is linked to this comes into contact with the lower surface of the frame 4, while the manual lift lever 49
9 is in the lowered position, the rod 48 connecting the sensor 42 and the bell crank lever 45
is compressed by the pinching deformation of the spring 84 provided in the middle, thereby preventing the sensor 42 from being excessively pressed against the float 7, and allowing the manual lift lever 49 to be rotated to the body lowering position. In other words, the configuration is such that the manual lift lever 49 can move the body up and down in preference to the vertical movement of the body by the sensor 42.

The seedling platform 10 in the seedling planting device 12 is attached to the operating handle 13 via a guide rail 54 so as to be able to move laterally, and the power from the engine 3 is transmitted to the transmission case 5 within the cylindrical frame 5'. Axis 5
5 and an intermediate shaft 59 with a planting clutch mechanism 58 transmitted through a pair of bevel gears 56 and 57;
A main shaft 61 to which power is transmitted from the main shaft 61 to the chain 60 from the main shaft 61 and a camshaft 63 to which power is transmitted from the main shaft 61 via a speed change gear mechanism 62 are respectively supported at right angles to the machine body, and both ends thereof are connected to the seedling stand 10. A feed shaft 65 that comes into contact with the inner surface of a pair of brackets 64 attached to the front is slidably provided parallel to the cam shaft 63, and a reciprocating thread groove 66 is provided on the outer periphery of the cam shaft 63.
A ship-shaped sliding key 67 fixed to the feed shaft 65 is engaged to rotate the cam shaft 63 so that the seedling platform 10 is reciprocated from side to side and laterally fed.

Both ends of the main shaft 61 inside the transmission case 5 protrude from both side surfaces of the case, and tubular horizontal members 68, 68 extending laterally are fastened to the case side surfaces around the projecting ends. Members 68, 68
Chain cases 69, 69 whose lower ends are inclined toward the front of the fuselage are fixed to the tips of the transmission case 5 and the lower ends of both chain cases 69, 69 and the transmission case 5, respectively.
The pawl shafts 70, 70, 71 are arranged on the same axis perpendicular to the machine body at the lower part of the transmission case 5, and the pawl shafts 70, 70, 71 in the transmission case 5
1 is rotationally driven from an intermediate shaft 59 via a chain 72 and a safety clutch 73, and both chain cases 69,
The claw shafts 70, 70 in 69 are connected from the main shaft 61 in the transmission case 5 to the transmission shafts 74, 74 in the horizontal members 68, 68 and the chains 75, 7 in the chain case.
5 Furthermore, seedling catchers provided on the guide rail 54 are rotatably driven via safety clutches 76, 76, and are provided at both ends of the pawl shaft 71 in the transmission case 5 and at the inner ends of the pawl shafts 70, 70 in both chain cases 69. 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.

Then, turn ON/OFF the planting clutch mechanism 58.
A shifter lever 77 is attached to a planting clutch lever 78 provided at an appropriate location such as the control handle 13.
Rotating the clutch lever 78 in the forward direction of the aircraft body turns the clutch ON, and rotating the clutch lever 78 in the rearward direction turns the clutch OFF. A joint body 82 that engages with the long slot 81 through the long slot 81.
and the planting clutch lever 78 by rotating the clutch lever 78 in the rearward direction.
They are interlocked and connected via a wire 83 so that they can rotate upward.

In this configuration, when the manual lift lever 49 is rotated forward of the machine while the planting clutch lever 78 is rotated rearward to stop the seedling value device 12, the switching valve 33 linked thereto P and
Switching to lowering the aircraft where R ₂ and boats A and R ₁ communicate with each other, the oil pressure from the hydraulic pump 18 and the oil pressure in the hydraulic cylinder 22 are returned to the oil tank, and the piston 23 of the hydraulic cylinder 22 is moved by the weight of the aircraft. The aircraft moves backward, and both swing arms 14 rotate upward, causing the aircraft to descend. When the lift lever 49 is rotated to the rear of the aircraft, the switching valve 33 closes to the port.
R ₁ and R ₂ are closed, and the switch is made to raise the aircraft so that ports P and A are in communication 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 both swing arms 14 to move forward. Since the aircraft rotates downward, the aircraft will rise, and if the elevator lever 49 is placed in the intermediate position above, the switching valve 33 will move upward.
is switched to the neutral position where ports _R1 and A are closed and ports P and _R2 are communicated with each other, and the flow of hydraulic pressure into and out of the hydraulic cylinder 22 is cut off, so that the vertical movement of the machine body can be stopped at any position.

To carry out rice planting work after traveling on the road with the machine in a highly elevated state and carrying it into the field, rotate the planting clutch lever 78 forward to close the seedling planting device 12.
When the sensor 42 is connected to this via the wire 83, it rotates downward so as to come into contact with the top surface of the float 7, and the body 6 begins to descend. After the float 7 touches down on the field, it connects with the body. When the distance between the float and the fuselage gradually approaches and the height between the float and the aircraft reaches a predetermined height, the switching valve 33 returns to the neutral position as the sensor 42 in contact with the upper surface of the float 7 rotates upward. When it is returned, the descent of the machine body is stopped, and the height of the machine body relative to the field can be automatically set to a predetermined height position, and rice planting work can be carried out.

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 By the downward rotation of the sensor 42 in contact with the float 7, the switching valve 33 is switched to lower the machine body, and the machine body is returned to a predetermined height position, and the height relative to the field scene is changed to become lower. In this case, the upward rotation of the sensor 42 causes the switching valve 3 to
In this way, the height of the machine relative to the field scene is automatically controlled and adjusted to a predetermined height position, such that the height of the machine relative to the field is automatically adjusted by switching to raising the machine and returning the machine to a predetermined height position.

In this case, the rod 48 connecting the sensor 42 and the switching valve 33 has a spring 8 whose length can be shortened.
4 to allow free rotation of the manual lift lever 49, while the switching valve 33 is equipped with a manual lift lever 4.
9 are directly connected, the vertical movement of the aircraft body can be performed by operating the manual lift lever 49 regardless of the sensor 42, in other words, it can be performed with priority over the sensor 42.

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. According to the present invention, the planting clutch mechanism 5 is rotated by rotating the planting clutch lever 78 in the rearward direction.
8 to stop the seedling planting device 12, the sensor 42 connected to the planting clutch lever 78 via the wire 83 rotates upward, and the switching valve 3 is turned off.
3 switches to raise the aircraft and the aircraft moves upward, then after changing the direction of the aircraft, if the planting clutch lever 78 is rotated forward, the planting clutch mechanism 58 is turned on and the seedlings are planted. At the same time as the device 12 is driven, the downward rotation of the sensor 42 causes the machine to descend to a predetermined height and begin rice planting work, and the seedling planting device is activated by operating one planting clutch lever 78. It is possible to turn on and off and raise and lower the aircraft at the same time.

In this case, the planting clutch lever 78 is not connected directly to the float 7, but is connected to the sensor 42 that comes into contact with the upper surface of the float 7, so that when the planting clutch lever 78 rotates in the clutch cutting direction, Since only the sensor 42 rotates and does not lift the float 7, the weight of the float 7 does not affect the rotation of the planting clutch lever 78 in the clutch cutting direction, making the planting clutch lever 78 lighter. It can be rotated in the direction of clutch disengagement using force.

Therefore, according to the present invention, when changing direction during rice planting work, the operation of stopping the seedling planting device and raising the machine body, and the operation of lowering the machine body and driving the seedling planting device can be performed using a single planting clutch. While this can be done simultaneously by turning the lever, the weight of the float does not act on the turning of the planting clutch lever in the clutch cutting direction, and the seedling planting device can be stopped by clutch cutting and the machine can be turned off at the same time. Since the raising operation can be performed with a light force, changing direction during rice transplanting can be done extremely easily with a light force operation, and the operability of the rice transplanter, as well as the work efficiency of the rice transplanter, can be significantly improved. .

Moreover, in the present invention, the planting clutch lever is not linked to the float but to a sensor that contacts the top surface of the float, and the priority of the manual lifting lever with respect to the sensor remains unchanged. By operating the machine, the operator can freely raise and lower the machine regardless of the sensor and the planting clutch lever, which eliminates the inconvenience of being able to raise and lower the machine only by using the sensor and/or the planting clutch lever. It also has an effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of the rice transplanter, Fig. 2 is a plan view, Fig. 3 is a perspective view of the up-and-down device, and Fig. 4 is an enlarged sectional view taken from the side of Fig. 1. ,
FIG. 5 is an enlarged cross-sectional view of FIG. 1 taken in a negative direction, and FIG. 6 is an enlarged view of the sensor section. 1... Rice transplanter, 6... Body, 9... Wheels, 14
...Swing arm, 7...Float, 12...
Seedling planting device, 22...hydraulic cylinder, 33...switching valve, 49...manual lifting lever, 42...sensor, 58...planting clutch mechanism, 78...planting clutch lever.

Claims (1)

[Scope of utility model registration request] A hydraulic cylinder that is attached to the body of a rice transplanter so as to be able to move vertically is provided with a switching valve for switching the hydraulic cylinder to raise the machine, neutral, and lower the machine, and the switch valve is attached to the body of the rice transplanter. The movement of the float is controlled via a sensor that contacts the top surface of the float, so that when the height between the aircraft and the float increases, the aircraft is lowered, and when the height becomes lower, the aircraft is raised. A planting clutch configured so that a valve can be switched in priority to the movement of the sensor by a manual lift lever provided at an appropriate location on the machine body, and which operates a planting clutch mechanism of a seedling planting device in a rice transplanter. A lifting/lowering operating device for a rice transplanter, comprising a lever and the sensor that are interlocked so that the sensor rotates upward as the planting clutch lever rotates in the clutch release direction.