JPS63279709A - Lift for rice transplanter - Google Patents

Abstract

PURPOSE:To readily carry out direction turning, by regulating a lift height of a machine body by lifting a float through operation of an operating lever to a constant height at which the machine body can be turned and raising the machine body to a state without mud pushing or more lift than that required. CONSTITUTION:In order to turn the direction of a rice transplanter in a field, rice transplanting is stopped and an operating lever 55 is rotated to the front direction to lift the front of the central float 7. A changeover valve 33 is changed over to machine body lift through a sensor 35 and lift the machine body. An engaging piece 54 is protruded by force of a spring 53 and meshes with rack teeth 50 to transmit forward movement of a connected moving body 52 by advance of a piston 23 to a spool 34 of the changeover valve 33 and return the changeover valve 33 to the neutral position. The machine body stops the rising movement at a position elevated by a given height.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for raising and lowering a rice transplanter's body by vertically moving wheels attached to the body of the rice transplanter.

[Conventional technology]

When the height of the rice transplanter's body relative to the field is automatically controlled to a constant level according to the movement of a float installed in the field, the float is moved up and down using a lift control lever attached to an appropriate location on the machine. The method of raising and lowering the aircraft by doing this is disclosed in Japanese Patent Application Laid-Open No. 52-508 as a prior art.
It is disclosed in Publication No. 18.

[Problem that the invention seeks to solve]

However, with this machine, as long as the lift control lever is operated to the float lifting position, the machine will move upward. Delaying the release of the lift control lever may cause the aircraft to rise higher than necessary, or releasing the lift control lever too early may cause the aircraft to rise insufficiently, causing the aircraft to rise higher than necessary. If the height was too high, the aircraft would become unstable, and if the aircraft did not rise enough, the float would push mud over the field, making it heavy and difficult to turn. .

In this way, the present invention provides the following advantages when making direction turns in the field.
When the aircraft is raised by lifting the float with the lift control lever, the above-mentioned problem is resolved by automatically stopping the aircraft from rising by lifting the float when the aircraft rises to a certain height. It is.

That is, when turning a rice transplanter in a field, if the wheels are lowered to the maximum and the body is raised greatly, the body and float will rise significantly from the field, making it unstable and making it difficult to turn. This problem is solved by configuring the aircraft so that it only rises by a certain height when turning.

[Means for solving the problem] For this reason, the present invention provides a hydraulic cylinder for raising and lowering wheels that are movably attached to the fuselage, and is provided with a switching valve for switching the hydraulic cylinder to raise the fuselage, neutralize the fuselage, and lower the fuselage. A sensor is provided in the switching valve that contacts the float so that the movement of the float attached to the fuselage is switched to lower the fuselage when the height between the fuselage and the float becomes higher, and to raise the fuselage when the height becomes lower. In a lifting device for a rice transplanter, in which a control lever provided at an appropriate location on the machine body and the float are related to each other so that the float is lifted by operation of the control lever, the control lever includes: A mechanism is provided for returning the switching valve to the neutral position when the aircraft body rises to a certain height by operating the operating lever to the float lifting position.

〔Example〕

Next, an example of the present invention will be explained with reference to the drawings.
The rice transplanter is equipped with a frame 4 connected to a transmission case 5 at the rear thereof, a float 7 on the underside of the body 6, and a rice transplanter that runs in the direction of arrow (A) on a pair of left and right wheels 9, 9. , the rear end of the transmission case 5 is equipped with a seedling planting device 12 consisting of a seedling stand 10 and four planting mechanisms 11, and a pair of operating handles 13; Each of the floats 8.8 is provided on the outside, and the rear end of each of these floats 7.8, 8 is attached to the handle 13 or other body of the machine using a seedling adjustment rod 24 so that the height thereof can be adjusted. , the front end of the center float 7 is configured to be movable up and down via a link 27 between the tip and the bottom surface of the frame 4, and
The tips of both outer floats 8.8 are connected to links 32.3 to the tips of horizontal bars 3'l and '3'l that protrude laterally from the fuselage 6.
2 so that it can move up and down.

Furthermore, in the transmission case 5, there is a planting clutch (for turning on/off the seedling planting device 12 by means of a planting thalassotile lever 30 attached to the operating handle 13).
(not shown) is provided.

Both axles 9, 9 are connected to a swing arm 1 which is rotatably attached to the mission case 2 at a boss 15 at the base.
4 and 14, and is rotatably driven by a transmission case 2 which is powered by an engine 3 via a belt 16, through a chino etc. in the swing arm 14. is 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 shafts 20 that are supported through the mission case 2, and the tips of the lifting levers 19, 19 are , both swing arms 14
, 14 through rods 21 and 21, while
The frame 4 of the engine 3 is formed into a cylindrical cross-sectional shape, and a single-acting hydraulic cylinder 22 is installed inside the frame 4 so that its piston 23 protrudes forward along the center line of the rice transplanter 1. At the tip of the piston 23 in the hydraulic cylinder 22, the center part of the swinging rod 25 is horizontally swingable.
5 pivots, and both ends of this swinging rod 25 are connected to the lifting lever 1.
9. They are connected to the other end of 19 via connecting rods 28 and 2B with a buffer mechanism 29, so that both axles 9 and 9 can be moved up and down in opposite directions, and by the operation of the hydraulic cylinder 22,
The aircraft is configured to move up and down by moving both axles 9.9 up and down in unison.

On the other hand, the hydraulic pump 18 is provided with a 4-port 3-position switching valve a3, and a circuit 36 is connected to the pump port (P).
Connect the hydraulic pump 18 via a port (to) to the inlet boat 22' to the hydraulic cylinder 22 via a circuit 37, return ports (R1), (R2),
The spool 3 in the switching valve 33 is connected to the oil tank 39 respectively.
4 is in the neutral position, port (A), (R1)
are both closed and ports (P) and (R2) communicate with each other, resulting in a so-called neutral position in which the piston 23 in the hydraulic cylinder 22 does not operate. However, if the spool 34 moves forward of the fuselage 6, the port ( R1).

(R2) are both closed, ports (A) and (P) communicate with each other, and the forward movement of the piston 23 in the hydraulic cylinder 22 causes both axles 9, 9 to descend simultaneously, raising the body 6. , if the spool 34 moves to the rear of the fuselage 6, the ports (P), (R2) and port) (A),
(R1) are in communication with each other, and when the piston 23 in the hydraulic cylinder 22 moves backward, both axles 9.9 are raised simultaneously, and the body 6 is lowered.

Reference numeral 35 indicates a sensor having a bin 38 pivoted to the lower part of the frame 4 of the fuselage 6 so that its tip is in contact with the upper surface of the central float 7, and reference numeral 40 indicates a sensor having the switching valve 33.
Each pin is shown pivoted above the bin 40;
The arm 41 that engages with the spool 34 of the switching valve 33 and the T-shaped lever 42 are fixed, and when the sensor 35 rotates downward, one end of the T-shaped lever 42 and the base end of the sensor 35 are switched. When the valve 33 switches to lower the fuselage 6 and the sensor 35 rotates upward, the connection is made via the rod 43 so that the switch to raise the fuselage 6.

In addition, one end of the T-shaped lever 42 is connected to a rod 45, a link 46, and a rod 47 with respect to a manual lift lever 44 provided at an appropriate location such as the control handle 13 so as to be rotatable in the longitudinal direction of the aircraft body 6. , so that the lifting and lowering operation of the body 6 by rotating the manual lifting lever 44 can be performed with priority over the movement of the sensor 35.

Note that the rod 43 connecting the sensor 35 and the T-shaped lever 42 is configured so that the rod 43 resists a spring 48 and contracts.

A rack rod 49 having rack teeth 50 is connected to the other end of the T-shaped lever 42, while an interlocking body 52 held by a spring 51 is slidably connected to the piston 23 of the hydraulic cylinder 22. into the hydraulic cylinder 2.
2, the interlocking body 52 is configured to move forward against the spring 51 as the piston 23 moves forward, and the interlocking body 5
2, there is a bar 9 at the location where the rack rod 49 passes through.
An engaging piece 54 is provided which is biased so as to mesh with the rack teeth 50 at the screw 53, and this engaging piece 54 and an operating lever 55 provided at an appropriate location on the operating handle 13 etc. are connected to the operating lever 55. When the engaging piece 54 is rotated backward, the engaging piece 54 will release the spring 53.
If the control lever 55 and the front part of the center float 7 are connected via the wire 56 so that the control lever 55 is moved back against the force and the mesh is disengaged, and if the control lever 55 is rotated in the forward direction,
The central float 7 is connected via a wire 57 so as to rise upward. .

In this configuration, in order to carry the rice transplanter into the field and perform rice transplanting work, first move the manual lever 44 to the machine-up position to raise the machine 6 significantly, and then lower the machine.
The sensor 35 interlocked with this via the T-shaped lever 42 rotates downward so as to come into contact with the upper surface of the center float 7, while the body 6 begins to descend, and after the center float 7 touches down on the field, When the distance between the body 6 and the field area gradually approaches and the height of the center float 7 and the body 6 reaches a predetermined height, the sensor 35 comes into contact with the upper surface of the center floor door. With the upward rotation, the switching valve 3.3 is returned to the neutral position, the descent of the machine body 6 is stopped, and the height of the machine body relative to the field scene can be automatically set to a predetermined height position. .

While performing rice planting work in this state, while moving forward, the height of the machine body 6 relative to the field surface becomes higher due to the unevenness of the field surface, where both the axles 9.9 touch the tiller and the center float 7 touches the ground. If the change occurs, the sensor 35 in contact with the center float 7 is rotated downward, and the switching valve 33 is switched to lower the machine body, returning the machine body 6 to a predetermined height position, and also lowering the height relative to the field. When the height of the aircraft changes to become lower, the upward rotation of the sensor 35 causes the switching valve 33 to switch to raise the aircraft, and the aircraft 6 is returned to a predetermined height position. 6 can be automatically controlled and adjusted to a predetermined height position.

To turn the rice transplanter in the field, the planting clutch is disengaged by operating the planting clutch lever 30 to stop planting the seedlings, and then the operating lever 55 is rotated in the forward direction. 57, the front part of the center float 7 is lifted to approach the fuselage 6, the sensor 35 in contact with the center float 7 is rotated upward, and the switching valve 33 linked to this is switched to raise the fuselage. cylinder 2
The second piston 23 moves forward and moves the body 6 upward.

At approximately the same time as this forward rotation of the operating lever 55, the engaging piece 54 interlocked with the operating lever 55 via the wire 56 protrudes due to the force of the spring 53 as the wire 56 loosens, and engages the rack teeth 50 of the rack rod 49. Rack rod 49 engages with
Then, the forward movement of the piston 23 pushes the interlocking body 52 forward, and this movement moves the spool of the switching valve 33 via the rack rod 49 and the T-shaped lever 42. 34 and the switching valve 33
Since the aircraft 6 returns to its neutral position, its upward movement automatically stops at a position where the aircraft body 6 has risen by a certain certain height.

That is, the body 6 can be raised to a certain height by operating the control lever 55, without having to rise from the field to the highest raised position, in other words, to a height at which the body 6 can turn.

To return to rice transplanting work after this turning operation, rotate the operating lever 55 backward to disengage the interlocking body 52 and the rack rod 49, while the central float 7 descends from the machine body and the sensor 35 rotates downward, the switching valve 33 switches to lower the aircraft, the aircraft 6 is lowered, and eventually, when it reaches a predetermined height, the switching valve 33 returns to the neutral position as the sensor 35 rotates upward. Then, the height will be restored to the height for rice planting work.

In this case, the operation lever 55 is turned to ON-O.
If it is integrated with the lever 30 of the planting clutch that is turned FF, in other words, if the operation lever 55 is also used by the planting thalassotile lever 30, the machine body can be raised to a certain height at the same time as the seedling planting device 12 is stopped, and the machine can be raised to a certain height after turning. Since the seedling planting device 12 can be driven at the same time as the machine is lowered, the turning operation becomes extremely simple.

[Action/effect of the invention]

As described above, the present invention has the structure set forth in the claims, so that the height when the aircraft is raised by lifting the float by operating the control lever is as follows:
Since the aircraft can always be regulated to a certain height at which it can turn, when raising the aircraft using the control lever, if you release the control lever too early, the rise will be insufficient, and if you release the control lever too late. In other words, when operating the operating lever,
There is no need to consider the timing when releasing the hand from the operating lever.

Therefore, according to the present invention, when making a direction turn, it is possible to raise the aircraft to a state where there is no mud pushing by the float or an unnecessary rise by a very simple operation using the control lever, so that the direction turn can be made in a stable attitude. It is easy to do and has the effect of improving the efficiency of rice transplanting work.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of a rice transplanter, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a perspective view of a lifting device. ■...Rice transplanter, 6...Body, 7...Float, 9...Wheel, 14...Swing arm, 2
2... Hydraulic cylinder, 23... Piston, 33
...Switching valve, 35...Sensor, 55...
Operation lever, 49...Rack rod, 52...Interlocking body, 54...Engagement piece, 56.57...Wire.

Claims (1)

[Claims] (1) A hydraulic cylinder that is attached to the fuselage so as to be able to move up and down, for raising and lowering the wheels, is provided with a switching valve to switch it between the aircraft raised, neutral, and lowered, and the switching valve is attached to the aircraft. The movement of the float is controlled via a sensor in contact with 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. In a lifting device for a rice transplanter, which comprises a control lever provided at a location and the float, the control lever is connected to the float so that the float is lifted by operating the control lever, and the control lever has a mechanism for operating the control lever to a float lifting position. A lifting device for a rice transplanter, characterized in that a mechanism is provided for returning the switching valve to a neutral position when the machine body rises to a certain height.