JPS6355883B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating device for a walking type mobile agricultural machine for paddy fields, particularly for a walking type rice transplanter.

Conventionally, walking-type mobile agricultural machines for rice fields (hereinafter referred to as rice transplanters) that have automatic body height hydraulic control mechanisms have a hydraulic mechanism that operates in addition to a main clutch lever and a working clutch lever (hereinafter referred to as planting clutch levers). required a hydraulically operated lever. Therefore, when turning the headland, it is necessary to turn the planting clutch lever off at the same time as turning the side clutch, and then move the hydraulic control lever from automatic to the raised position. However, these operations are difficult to perform, and the hydraulic control lever is usually left in automatic mode to turn the headland. Therefore, as the float rotates while remaining in contact with the rice field, as in the case of planting work, mud is pushed on the side of the float, causing the rice field on the headland area, which has been leveled and leveled, to become uneven. In some cases, mud was pushed out into the planting area outside the headland area, burying the planted seedlings.

There is also a device in which the planting clutch lever and the hydraulic operating lever are linked, and the hydraulic operating lever is switched to the raised position in conjunction with the cutting operation of the planting clutch lever or the overstroke from the off position. In this case, the hydraulic cylinder of the machine height hydraulic control mechanism fully extends until it reaches the stroke end and raises the machine to its highest position, so even if the machine climbs too high and the planting clutch is engaged at the time of starting planting after turning. There was a delay in the aircraft's return to descent, and planting work began before the float had touched the ground, causing problems such as floating seedlings.

Furthermore, when replenishing seedlings, the hydraulic control lever is switched from automatic to fixed or lowered position, but when resuming planting work after seedling replenishment, the operator forgets to return the hydraulic control lever to the automatic position. As a result, planting work was often started without the aircraft body being at an appropriate height, resulting in problems in the planting work.

Therefore, the present invention provides a linking device to the switching valve of the hydraulic cylinder, connects it to the linking device with a predetermined play, and operates the main clutch lever.
The movement of the linkage device in one direction is restricted to prevent the switching valve from moving to the aircraft up position, and the operation of the work (planting) clutch lever restricts the movement of the linkage device in the other direction, so that the switching valve prevents the aircraft from moving to the up position. An operating device for a walking-type mobile agricultural machine (rice transplanter) for paddy fields that prevents the machine from going into the lowered position and allows only the main clutch lever and the work (planting) clutch lever to perform any work, eliminating the above-mentioned drawbacks. The purpose is to provide the following.

Embodiments of the present invention will be described below with reference to the drawings.

The rice transplanter 1, as shown in FIGS. 1 and 2,
It has a fuselage 5 consisting of an engine 2, a transmission 3, etc., and a float 6 is suspended below the fuselage 5 so as to be swingable around an adjustment fulcrum 7 at the rear and supported by a link 8 at the front. . Also, aircraft 5
A handle 9 extends behind the handle 9.
A seedling stand 10 is fixed along the seedling stand 10, and a planting rod 11 is arranged with power transmitted from the mill 3 via a planting clutch. Furthermore, a paddy wheel 15 is disposed on the fuselage 5 through a chain case 13 that is swingably supported by a shaft 12, and the chain case 13 is connected to a hydraulic cylinder that is fixed to the fuselage via a link. 16 pistons 16a. hydraulic cylinder 1
6 is of a double-acting type as shown in FIG. 7, and communicates with a hydraulic pump 19 via a rotary switching valve 17, so that the height of the paddy wheel 15 relative to the body 5 can be adjusted by operating the valve. Can be set to .

And, as shown in detail in FIGS. 3 and 4,
A semicircular plate 20 constituting a linking device is fixed to the operating shaft 17a of the rotary valve 17, and the plate 20 has two elongated holes 20a arranged on the same circumference and having approximately the same length. ,20
b is formed. These long holes 20a, 20b
Pins 21a and 22a provided at the tips of the wires 21 and 22 are fitted into the pins 21a and 22a, respectively, and the other ends of the wires 21 and 22 are respectively connected to a main clutch lever 25 and a planting clutch lever 26, which will be described in detail later. There is. Further, as shown in FIG. 5, a pin 27 is fixed to the central portion of the outer periphery of the plate 20 via a lug 20c.

On the other hand, a sensing rod 29 constituting a body height sensing mechanism is pivotally supported on the front link 8 portion of the float 6, and the other end of the rod 29 is connected to an arm 30. As shown in FIG. 6, the arm 30 is rotatably supported by a pin 30a fixed to the body 5, and another arm 31 having a bending/engaging portion 31a is attached to the pin 30a. The arm 31 is engaged by the engaging portion 31a only when the arm 30 rotates upward, that is, counterclockwise, and rotates together. Further, the arm 31 has a pin 31b implanted at the other end, and a spring 33 is tensioned between a plurality of selection pins 32 provided on the body 5, and the engagement portion 31a of the arm 31
and the float 6 engages the arm 30.
is biased clockwise to apply a predetermined ground pressure to the ground. Further, the pin 27 of the plate 20
and the pin 31b of the arm 31, the link 34
is passed, and both pins 27 and 31b are linked to link 3.
4, and are connected by a weak tension spring 35.

On the other hand, the main clutch lever 25 and the planting clutch lever 26, as shown in FIGS. 8 and 9,
Lever guide plate 36 provided at handle 9 part
The levers 25, 26 are rotatably supported by a support shaft 37, and the levers 25, 26 are guided by guide grooves 36a, 36b, respectively.
A wire 39 is connected to the clutch, and a wire 40 is connected to the planting clutch. Further, the main clutch lever 25 is attached to the support shaft 37.
and arms 41 and 42 are rotatably supported adjacent to the planting clutch lever 26,
Each arm 41, 42 is connected to the plate 20, respectively.
The rods 25a, 26a are connected to the wires 21, 22 which are connected to the levers 25, 26, and can rotate together by coming into contact with the rods 25a, 26a fixedly attached to the levers 25, 26. The guide groove 36a of the main clutch lever 25 is L-shaped, and the main clutch is engaged at the upper end position A and disengaged at the middle position B, and the rod 25a is not connected to the arm 41 at the A-B position. The arm 41 is brought into contact with the stopper pin 45 by a spring 43 (FIG. 2) provided at the other end of the wire 21, and the pin 21a at the other end of the wire 21 is located at the center of the elongated hole 20a. Further, when the arm 41 is engaged with a position C which is a locking portion, the arm 41 is rotated integrally with the lever 25 via the rod 25a. Also,
A spring 46 is fixed to the back surface of the plate 36 in the middle of the guide groove 36b of the planting clutch lever 26, forming a resistance stopper. At the D-E position, the rod 26a does not come into contact with the arm 42, and the arm 42 does not touch the spring 4 provided at the other end of the wire 22.
7 (FIG. 2), the pin 22a at the other end of the wire 22 is set so as to be in contact with the stopper pin 49 and located in the center of the long hole 20b, and further beyond the resistance stopper 46 to a lower position F. At this point, the arm 42 rotates together with the lever 26 via the rod 26a, and when the wire 22 reaches the position G two steps below the guide groove 36b, the wire 22 is further pulled and the pin 22a rotates the plate 20.

Next, the operation of this embodiment based on the above configuration will be explained.

To perform planting work with the rice transplanter 1, as shown in FIG.
, switch to the engaged position A, connect the main clutch (traveling clutch), and turn the planting clutch lever 26
Switch from the disconnected position E to the engaged position D, and connect the planting clutch. Then, the rice transplanter 1 runs with the rice paddy wheels 15 driven, and the planting rod 11 rotates to perform the planting work, and the arms 41 and 42 move to the positions A and 2 of the clutch levers 25 and 26, respectively. D, stopper pins 45, 49 regardless of disconnection positions B and E
The pins 21a and 22a are in contact with the plate 2 in the neutral state via the wires 21 and 22.
0 is located at the center of the long holes 20a and 20b. As a result, the plate 20 can rotate upwardly Y and downwardly Z with respect to the neutral position X within the range of the elongated holes 20a and 20b, and rotates the plate 20 following the vertical movement of the float 6. The hydraulic cylinder 16 is operated by switching the pulp 17 between forward and reverse directions to automatically control the height of the machine over the entire range. for example,
When the ground pressure of the wheels 15 on the tiller is weak, a large pressure acts on the float 6 from the field surface, lifting the front of the float 6 with respect to the machine body 5. Then, the arm 30 is rotated counterclockwise via the sensing rod 29, and the arm 31 is also rotated integrally in the same direction via the engaging portion 31a, and the pins 31b and 27 are moved into the elongated hole by the spring 35. The plate 20 is rotated in the downward direction Z via the link 34 while being held at the inner ends of the plates 34b and 34a. As a result, the valve 17 is switched, the piston 16a of the hydraulic cylinder 16 is extended, the swing chain case 13 is rotated, and the paddy wheel 15 is moved downward. and,
When the body 5 rises to a predetermined height and the pressure from the rice field acting on the float 6 reaches a predetermined value, the front part of the float swings downward with respect to the body, and the plate 20 is moved through each rod, arm, and link. is the neutral position
will be returned to. Conversely, when the ground pressure of the paddy wheel 15 on the tiller is large, the front of the float 6 is lowered,
Each rod 29, arms 30, 31 and link 34
The plate 20 rotates in the upward direction Y, raises the paddy wheel 15 by a predetermined amount, and lowers the body 5 to a predetermined height. As described above, the height of the body 5 is always maintained at an appropriate level by automatically controlling the height of the wheels 15.

Next, when the rice transplanter 1 reaches the headland and turns around, the main clutch lever 2 is pressed down as shown in FIG.
5 remains in the engaged position A, the planting clutch lever 26 is switched to the lower position F beyond the resistance stopper 46. Then, the planting clutch is cut, and at the same time, the arm 42 is rotated via the rod 26a to pull the wire 22 and release the pin 22a.
However, in the neutral state X of the plate 20, the elongated hole 20
It is moved so that it touches the outer edge of b. At this time, the main clutch lever 25 remains in the engaged position A 26 (the same is true in the disengaged position B), so the pin 21a is located in the center of the elongated hole 20a in the neutral state of the plate 20, as described above. positioned.
That is, in this state, the plate 20 is attached to the pin 22a.
is in contact with the end of the elongated hole 20b and is prevented from rotating in the upward direction Y, thereby preventing the valve 17 from reaching the body lowering position. In this state, when the handle 9 is lifted upward, the distance between the front part of the float 6 and the fuselage 5 becomes narrower, and the above-described automatic control in the ascending direction of the fuselage is activated. That is, the plate 20 is connected via the rod 29, arms 30, 31 and link 34.
rotates in the downward direction Z, switches the valve 17 to extend the hydraulic cylinder 16, lowers the wheels 15, and raises the body 5. When the machine body 5 rises by the desired amount, the handle 9 is lowered to bring the rice transplanter 1 into a horizontal state.
At this time, the float 6 hangs down and the plate 20
When trying to rotate the plate in the upward direction Y, the plate 20
Rotation in the upward direction Y is restricted, and automatic control prevents the aircraft 5 from descending. In this state, the arm 30 of the float 6 is
The arm 30 is separated from the engagement portion 31a and rotated clockwise to the center of the pin 30a.
The float 6 is in a suspended state together with the rod 29 and the float 6 is in a state in which it is in light contact with the surface of the field without the weight of the machine acting on it. When the rice transplanter 1 is turned in this state, the body 5 is maintained at an appropriate height regardless of whether it is in Asada or Fukada, and can be easily turned without mud being pushed by the floats 6. Note that in this embodiment, the arms 30 and 31 are separated,
Although the weight of the float 6 was prevented from acting directly on the plate 20, these arms 30 and 31 were configured as one piece, and the weight of the float 6 was prevented from acting directly on the plate 20.
It is also possible to keep the float completely away from the rice field so that it does not sag.

Furthermore, in order to supply seedlings to the seedling stand 10 of the rice transplanter 1, as shown in FIG.
5 is held in the locking position C, the main clutch is disengaged, and the planting clutch lever 26 is left in the engaged position D. Note that even when the planting clutch lever 26 is in the engaged position, the main clutch is disengaged, so the planting rod 11 does not rotate. Then, Rod 25
The arm 41 is rotated via a, and the wire 21
is moved so that the pin 21a is in contact with the outer end of the elongated hole 20a in the neutral state X of the plate 20. At this time, the planting clutch lever 26
remains in the engaged position D (the same holds true for the disengaged position E), and therefore, the pin 22a is located at the center of the elongated hole 20b in the neutral state of the plate 20, as described above. That is, in this state, the pin 21a of the plate 20 is in contact with the end of the elongated hole 20a, preventing it from rotating in the downward direction Z, and the switching valve 17
is prevented from going into the raised position. Therefore, when the pressure from the rice field acting on the float 6 is small, the front part of the float 6 lowers, and the plate 20 rotates in the upward direction Y via the rod 29, arms 30, 31, and link 34, and the body 5 is rotated. The plate 20 is automatically controlled in the downward direction, but even if the front part of the float 6 rotates upward relative to the fuselage 5, the plate 20 does not move in the downward direction Z.
pin 31b of arm 31.
is absorbed by moving along the elongated hole 34b against the spring 35. Thereby, the body 5 and the float 6 are stably grounded at a position close to the rice field, and seedlings can be easily replenished.
Furthermore, when the main clutch lever 25 is set to position A after seedlings are supplied, the main clutch is connected, the rice transplanter 1 runs, and the planting rod 11 rotates to start the planting work, and at the same time, the rice transplanter 1 automatically starts the planting operation. The aircraft is switched to automatic height control and maintained.

In addition, in order to stop the height control of the rice transplanter 1 and fix the rice transplanter 5 for transportation or storage, the 13th
As shown in the figure, the main clutch lever 25 is locked in the locking position C, and the planting clutch lever 25 is locked at the locking position C.
6 is switched to and held at the lower position F, beyond the resistance stopper 46. Then, the main clutch and planting clutch are disconnected, and at the same time, each rod 2
The arms 41 and 42 are rotated via the arms 5a and 26a to pull the wires 21 and 22. This results in
Both pins 21a, 22a are in contact with the outer ends of the elongated holes 20a, 20b of the plate 20, and the plate 20 is held at the neutral position X, and rotation in the upward direction Y and downward direction Z is prevented, so that the valve 17 is fixed at a neutral position, and the fuselage 5 is held at this position.

Furthermore, when the rice transplanter 1 is manually raised for running on the road or over a ridge, the main clutch lever 25 is in the engaged position A or the disengaged position B, and the planting clutch is not moved. Rotate the lever 26 to the second lower position G. Then, the planting clutch is cut, and at the same time, the arm 42 is rotated via the rod 26a, and the wire 22 is fully pulled, so that the pin 22a contacts the end of the long hole 20b of the plate, and the plate 20 is inserted into the long hole 20a. Pin 21a at the end
Rotate until they touch. Then, plate 20
is rotated in the downward direction Z regardless of automatic control by the float 6, operates the valve 17 to extend the hydraulic cylinder 16, lowers the wheels 15, and raises the fuselage 5. In this state, the planting clutch lever 26
When the lever 26 is released, the lever 26 is returned to the lower position F, and only the lifting of the aircraft is automatically controlled as shown in FIG.

Next, an embodiment partially modified from FIGS. 15 to 17 will be described.

The embodiment shown in FIG.
5, planting clutch lever 26 and each arm 41,
42, and pin 2 at entry positions A and D.
1a and 22a are maintained at the center position of each elongated hole 20a and 20b in the neutral state of the plate 20,
The cutting positions B and E are set to be located at the outer ends of the elongated holes 20a and 20b, respectively.

As a result, as shown in FIG. The aircraft will enter the automatic height control state as shown in the figure. In addition, as shown in FIG. 11, if the planting clutch lever 26 is moved to the disengaged position E while the main clutch lever 25 is in the engaged position A, the planting clutch is disengaged, and at the same time, the fuselage as shown in FIG. Only the upward direction is automatically controlled, and it is easy to turn around as described above. In addition, when replenishing seedlings, as shown in C, when the main clutch lever 25 is set to the disengaged position and the planting clutch lever 26 is set to the engaged position, the movement of the rice transplanter 1 is stopped, and the planting lever is moved by disengaging the main clutch. 11 also stops, and at the same time, only the downward direction of the aircraft is automatically controlled as shown in FIG. Furthermore, as shown in d, when both the clutch levers 25 and 26 are set to the disengaged positions B and E, the main clutch and the planting clutch are disengaged, and at the same time the first clutch lever is disengaged.
As shown in Figure 3, both pins 21a and 22a are connected to the elongated hole 2.
0a and 20b ends, the plate 20 is prevented from freely rotating, and the body is fixed at a predetermined height.

In the embodiment shown in FIG. 16, the guide groove 36a of the main clutch lever 25 is provided with a two-stage lower position H that is one stage lower than the locking portion (one-stage lower position) C.

As a result, as shown in FIG. 17, when the main clutch lever 25 is set to the two-step lower position H and the planting clutch lever 26 is set to the engaged position D or the disengaged position E,
The main clutch is cut, and at the same time the wire 21 is fully pulled, the pin 21a touches the end of the slot 20a, and the plate 20 is connected to the end of the slot 20b with the pin 22a.
Rotate until they touch. Then, plate 20
is rotated in the upward direction Y regardless of automatic control by the float 6, contracts the hydraulic cylinder 16, raises the wheels 15, and lowers the fuselage 5. By this manual forced lowering, the front part of the machine body 5 is supported on the float 6, and seedlings can be supplied while the machine body is stably held. At this time, even if the float 6 is in contact with the rice field and cannot be rotated downward, and therefore the link 34 is not movable, the pin 2
7 can be absorbed by moving along the elongated hole 34a against the spring 35. In addition, this embodiment is the same as the above-mentioned first embodiment except that the guide groove 36b of the planting clutch lever 26 is a stepped portion instead of the spring-based resistance stopper 46, so a description thereof will be omitted. do.

As explained above, according to the present invention, it is possible to control the height of the machine in all working conditions with only two operating levers, the main clutch lever 25 and the work (planting) clutch lever 26. The walking-type mobile agricultural machine (rice transplanter) 1 can be easily operated. In particular, when turning on a headland, the aircraft 5 can be raised simply by operating the work (planting) clutch lever 26 and lifting the handle 9, without causing mud pushing by the float 6. Therefore, the walking-type mobile agricultural machine for paddy fields (rice transplanter) 1 can be easily turned around without making the rice field surface uneven or burying the planted seedlings.
Furthermore, at this time, the height of the aircraft 5 can be raised arbitrarily depending on the lifting amount and time of the handle 9, so the optimal aircraft lifting position can be achieved regardless of Asada or Fukada. Work can be carried out efficiently without causing any problems. In addition, to supply seedlings, etc. to the working machine, simply operate the main clutch lever 25, and the machine body 5 is lowered to a predetermined position and held stably, making it possible to easily supply seedlings, etc., and to speed up the work. When restarting, the automatic height control of the machine body is automatically activated by simply moving the main clutch lever 25 to the engaged position A, and there is no risk of erroneous operation, and the proper height of the machine body can be maintained at all times.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a rice transplanter to which the present invention can be applied, Fig. 2 is a partial side view showing its main parts, Fig. 3 is an enlarged partial side view showing its main parts, and Fig. 4 is its A rear view, FIG. 5 is a perspective view showing the continuous traction device,
Fig. 6 is an exploded perspective view showing the arm constituting the aircraft height detection device, Fig. 7 is a view showing the hydraulic cylinder, Fig. 8 is a perspective view showing the main clutch lever and planting clutch lever, and Fig. 9 is a perspective view showing the arm constituting the aircraft height detection device. A side view showing the planting clutch lever, Fig. 10 is an explanatory diagram of the operation in the automatic height control state, Fig. 11 is an explanatory diagram of the operation in the automatic state of only lifting the aircraft, and Fig. 12 is an illustration of the operation in the automatic state of only lowering the aircraft. 13 is an explanatory diagram of the operation in the fixed state, FIG. 14 is an explanatory diagram of the operation in the manually raised state, FIG. 15 is a diagram showing the operation in each working state showing another embodiment, and FIG. 16 is an explanatory diagram of the operation in the fixed state. FIG. 17 is a diagram illustrating the operation in each working state showing a partially modified embodiment, and FIG. 17 is an explanatory diagram of the operation in the manually lowered state. 1... Walking type mobile agricultural machine for rice fields (rice transplanter), 5...
...Airframe, 13... (Chain) Case, 15...
Paddy wheel, 16...Hydraulic cylinder, 17...Switching valve, 20...Linkage device, 20a, 20b
...Play, 25...Main clutch lever, 26...
Work (planting) clutch lever, 6, 29-35...
...Aircraft height detection mechanism, B, E...Cut position, C, F
...further rotation position.

Claims (1)

[Scope of Claims] 1. A paddy wheel is provided on a case swingably supported by the aircraft body, the case is further connected to a hydraulic cylinder, and a switching valve of the hydraulic cylinder is connected to the aircraft height detection mechanism, In a walking type mobile agricultural machine for paddy fields configured to automatically control the height of the machine, the switching valve is provided with a linking device, and the linking device is connected to the main clutch lever and the working clutch lever with a predetermined play. , by operating the main clutch lever, the movement of the linking device in one direction is restricted and the switching valve is prevented from moving to the aircraft up position, and by operating the work clutch lever, the movement of the linking device in the other direction is restricted. An operating device for a walking type mobile agricultural machine for paddy fields, which regulates the switching valve and prevents the switching valve from moving to a lowering position of the machine. 2. Further rotation of the main clutch lever from the disengaged position restricts the movement of the linking device in one direction;
The operating device for a walking type mobile agricultural machine for paddy fields as claimed in claim 1, wherein further rotation of the work clutch lever from the disengaged position restricts movement of the linking device in the other direction. 3. A patent claim in which movement of the linking device in one direction is restricted by rotating the main clutch lever to the disengaged position, and movement of the linking device in the other direction is restricted by rotating the working clutch lever to the disengaged position. An operating device for a walking-type mobile agricultural machine for paddy fields according to item 1.