JPH0325122B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a walking-type mobile agricultural machine for paddy fields such as a walking-type rice transplanter, and more specifically, a machine height detection mechanism such as a float that automatically adjusts the height of the machine body. The present invention relates to a manual control device for the height of a walking-type mobile agricultural machine for use in rice fields that can be controlled automatically.

(b) Conventional technology Conventionally, walking-type mobile agricultural machines, such as rice transplanters, which operate the height of the machine body using a hydraulic actuator, connect a switching valve communicating with the hydraulic actuator to a body height detection mechanism such as a float. In addition to automatically controlling the height of the aircraft according to the earth pressure acting on the float, a hydraulic control lever is connected to the switching valve, and by manual operation of the hydraulic control lever, the height of the aircraft can be automatically raised, lowered, and neutral ( Fixed) is operated in each position.

Therefore, in addition to the main clutch lever connected to the travel clutch and the work clutch lever (hereinafter referred to as the planting clutch lever) connected to the work clutch (hereinafter referred to as the planting clutch lever), the rice transplanter has
A hydraulic control lever is required to control the lifting and lowering of the aircraft.

(c) Problems to be solved by the invention For this reason, when operating a rice transplanter on a headland,
Simultaneously with the rotation operation using the side clutch lever,
It is necessary to turn off the planting clutch lever and then move the hydraulic control lever from automatic to the raised position, but in reality, it is difficult for even experienced people to perform these operations in a short time at the start of planting. This was difficult, and the hydraulic control lever was normally left in automatic mode for headland turning. Therefore, as the float is planted while remaining in contact with the rice field, it causes mud to be pushed on the side of the float, making the rice field on the headland area, which has been leveled and leveled, rough and uneven. In some cases, mud was forced out into the planting area outside the headland area, burying the planted seedlings.

Particularly when transitioning from field work to across the ridge;
It is necessary to raise the machine body and hold it in the raised position, but at this time, it is necessary to operate the hydraulic control lever simultaneously with the operation of the planting clutch lever, making the operation extremely difficult.

Therefore, the present invention aims to raise and lower the aircraft using two operating levers: the main clutch lever and the work (planting) clutch lever. Therefore, it is an object of the present invention to provide a walking-type mobile agricultural machine for paddy fields that eliminates the above-mentioned problems.

(d) Means for Solving the Problem The present invention has been made in view of the above-mentioned circumstances, and for example, as shown with reference to FIG. 1, the first operating lever 26 and A second operation lever 25 is connected to a traveling clutch, and a paddy wheel is provided on a swinging member 13 that is swingably supported by the fuselage, and the singing member 13 is further connected to a hydraulic actuator 16. A switching valve 17 (seventh valve) communicating with the hydraulic actuator 16
A walking type for paddy fields configured so that the height of the machine can be automatically controlled by connecting the switch valve 17 (see Fig.) to the machine height detection mechanism 6, 29 and switching the switching valve 17 to the raised position, lowered position, and neutral position. Pertains to mobile agricultural machinery. Then, the switching valve 17 is connected to the play mechanism 20a,
20b (FIG. 3) to the first and second operating levers 26, 25, and based on the operation of the first operating lever 26, the switching valve 17 is raised. It is characterized by being configured so that the height of the aircraft can be manually raised by switching to the position.

(E) Effect Based on the above configuration, when the first operating lever 26 and the second operating lever 25 are in the predetermined positions, the linking means 20 can move freely within a predetermined range with its play mechanisms 20a and 20b, and the aircraft Height detection mechanism 6, 29
Based on this, the linking means 20 moves to switch the switching valve 17 to the raised position, the lowered position, or the neutral position, and the aircraft height is automatically controlled in accordance with the earth pressure acting on the aircraft height detection mechanism. Further, when the first operating lever 26 and/or the second operating lever 25 is operated appropriately, the linking means is restricted in its movement range or is held at a predetermined moving position, and the switching valve 17 is moved to the raised position, the lowered position, or the neutral position. Operate in position.

Then, with the second operating lever 25 held at a predetermined position, for example, the main clutch engaged position A or the disengaged position B, the first operating lever 26 is further turned fully beyond the predetermined position, for example, the work clutch disengaged position. When the switch is moved to G, the switching valve 17 is held in the raised position and the aircraft is raised. Then, when the second operating lever 25 is operated at the predetermined raised position and the first operating lever 26 is returned to a predetermined position, for example, a position F beyond the disengaged position of the working clutch, the switching valve 1
7 is held in the neutral position, and the aircraft is held in the raised position.

(f) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the traveling rice transplanter 1 has a body 5 consisting of an engine 2, a transmission 3, etc., and below the body 5 is a float 6 that is centered around an adjustment fulcrum 7 at the rear. and forward link 8
It is supported and suspended so that it can swing freely. Also,
A handle 9 extends to the rear of the machine body 5, a seedling stand 10 is fixed along the handle 9, and a planting rod 11 is arranged by power transmission from the transmission 3 via a planting clutch. has been done. Further, a paddy wheel 15 is disposed on the fuselage 5 via a chain case 13 that is swingably supported by a shaft 12 and constitutes a swinging member, and the chain case 13 is fixed to the fuselage via a link. The piston 16a of the hydraulic actuator 16 is connected to the piston 16a of the hydraulic actuator 16. The hydraulic actuator 16 is of a double-acting type, as shown in FIG. It can be set freely.

And, as shown in detail in FIGS. 3 and 4,
A semicircular plate 20 constituting a linking means is fixed to the operating shaft 17a of the rotary switching valve 17, and the plate 20 has two elongated holes arranged on the same circumference and having approximately the same length. 20
a, 20b are formed. These long holes 20
Pins 21a and 22a provided at the tips of the wires 21 and 22 are fitted into the pins 21a and 20b, respectively, to form a play mechanism, and the other ends of the wires 21 and 22 are connected to a main clutch lever 25 and a planting mechanism, which will be described in detail later. The clutch levers 26 are connected to each other. Also,
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
is engaged with the arm 30, and the float 6
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 (working) clutch. Further, arms 41 and 42 are rotatably supported on the support shaft 37 adjacent to the main clutch lever 25 and the planting clutch lever 26, respectively, and each arm 41 and 42 is linked to the plate 20, respectively. The rods 25a, 26a are connected to the wires 21, 22, and are fixed to the levers 25, 26, so that they can rotate together. 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 interrupted position B.
Also, at the A-B position, the rod 25a is connected to the arm 41.
The arm 41 does not come into contact with the stopper pin 45 due to the spring 43 (FIG. 1) provided at the other end of the wire 21, and
The pin 21a at the other end is set to be located in the center of the elongated hole 20a, and when it is further engaged in the locking position C, the arm 41 is moved to the rod 2.
It is rotated together with the lever 25 via the lever 5a. In addition, the guide groove 36b of the planting clutch lever 26 has a spring 46 attached to the back surface of the plate 36 at an intermediate portion thereof.
is fixed to form a resistance stopper, and the planting clutch is engaged at the upper end position D, and the stopper 46
The rod 26a is broken at the upper position E, and at the D-E position, the rod 26a does not come into contact with the arm 42, and the arm 42
is set so that it abuts against a stopper pin 49 by a spring 47 (FIG. 1) provided at the other end of the wire 22, and the pin 22a at the other end of the wire 22 is located at the center of the elongated hole 20b. When the arm 42 further passes the resistance stopper 46 and reaches the lower position F, the arm 42 rotates together with the lever 26 via the rod 26a, and when the arm 42 reaches the lower position G of the guide groove 36b, the wire 22 is further pulled. As a result, 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. Switch the valve 17 between forward and reverse to operate the hydraulic actuator 16,
Automatically controls aircraft height 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, and the machine body 5
The front part of the float 6 is lifted up. Then, the arm 30 is rotated counterclockwise (FIGS. 1 and 3) via the sensing rod 29, and the engaging portion 31 is further rotated.
The arms 31 are integrally rotated in the same direction via a,
With the pins 31a and 27 held at the inner ends of the elongated holes 34b and 34a by the spring 35,
The plate 20 is rotated in the downward direction Z via the link 34. As a result, the valve 17 is switched and the piston 16a of the hydraulic cylinder 16 is extended.
The paddy wheel 15 is rotated by rotating the swing chain case 13.
move downward. Then, when the fuselage 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 relative to the fuselage, and the float moves through each rod, arm, and link. Plate 20 is returned to neutral position X. vice versa,
When the ground pressure of the paddy wheel 15 on the plowing platform is large, the front of the float 6 is lowered, and the plate 2
0 rotates in the upward direction Y, raises the paddy wheels 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 is to be planted, the main clutch lever 2 is pressed down as shown in Fig. 11.
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, the elongated hole 20 in the neutral state X of the plate 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 (although the same is true in the disengaged position B), so the pin 2
As described above, 1a is located at the center of the elongated hole 20a in the neutral state of the plate 20. That is, in this state, the pin 22a contacts the end of the elongated hole 20b, preventing the plate 20 from rotating in the upward direction Y, and preventing the valve 17 from moving to the body lowering position. In this state, the handle 9
When the float 6 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, rod 29, arm 3
0, 31 and link 34, the plate 20 rotates in the downward direction Z, switches the valve 17, extends the hydraulic actuator 16, lowers the wheels 15, and raises the fuselage 5. When Aircraft 5 rises by the desired amount,
The handle 9 is lowered to bring the rice transplanter 1 into a horizontal state, but at this time the float 6 hangs down and attempts to rotate the plate 20 in the upward direction Y, but the rotation of the plate 20 in the upward direction Y is restricted. Therefore, the aircraft 5 will not descend due to automatic control. In this state, the arm 30 of the float 6 is separated from the engagement portion 31a of the arm 31 and the pin 30a
By rotating clockwise around , the float 6 is in a suspended state together with the arm 30 and the rod 29, and therefore the float 6 is in a state in which it is in light contact with the field surface without the weight of the machine acting on it. When the rice transplanter 1 is rotated in this state, the rice transplanter 5 is maintained at an appropriate height regardless of whether it is shallow or deep, and the rice transplanter 1 can be easily operated without mud pushing by the floats 6. In this embodiment, the arms 30 and 31 are separated to prevent the weight of the float 6 from directly acting on the plate 20, but these arms 30 and 3
It is also possible to configure the float 6 as an integral piece so that the float 6 does not hang down when the aircraft is lifted, and the float is completely separated from the rice field.

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 low position on the rice field surface, and seedlings can be easily replenished. Also, after replenishing the seedlings, put the main clutch lever 25 into position A.
When this is done, the main clutch is connected, the rice transplanter 1 runs, and the planting rod 11 rotates to start planting work, and at the same time, the automatic height control of the machine body 5 is automatically switched 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 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 touches 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 along FIGS. 15 and 16 will be described.

The embodiment shown in FIG.
The guide groove 36a of No. 5 is provided with a two-way lower position H that is one step lower than the locking portion (one step lower position) C.

As a result, as shown in FIG. 16, 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.

(G) Effects of the Invention As explained above, according to the present invention, the height of the machine in all working conditions can be controlled using only two operating levers, the first operating lever 26 and the second operating lever 25. This makes it possible to easily operate the walking type mobile agricultural machine 1 for paddy fields. To be more specific, when operating two of the three operating levers (main clutch lever, working clutch lever, and hydraulic operating lever) almost simultaneously as in the past, the operator must check the levers visually beforehand. In addition to being difficult to operate, it is also necessary to check the operation position of each control lever before operating it, but when operating one of the two control levers, there is no need to visually check the lever. Furthermore, the operating position of the operating lever can be operated without visual confirmation due to the stop position of the guide plate, etc., and ergonomically, while paying attention to the operating state and other operations such as the side clutch lever, The aforementioned two operating levers can be easily operated. In particular, when you reach a headland during work and turn, you can disconnect (or connect) the work clutch and raise (or lower) the aircraft by simply operating the first operating lever 26. becomes extremely easy. Furthermore, when crossing a ridge after finishing work in the field, simply by operating the first operating lever 26, the work clutch is disengaged and the machine is raised to quickly and easily cross the ridge. Can be done. In addition, when replenishing seedlings, etc., when it is necessary to raise the aircraft due to high ridges, the aircraft can be raised simply by operating the first operating lever 26, making operation easier. Even in this case, the first operating lever 26 can be used to raise the aircraft as necessary, and the structure is relatively simple.

[Brief explanation of drawings]

FIG. 1 is a side view showing the main parts of the operating device according to the present invention, FIG. 2 is a side view showing a rice transplanter to which the invention can be applied, and FIG. 3 is an enlarged partial side view showing the main parts. FIG. 4 is a rear view thereof. Also, the fifth
The figure is a perspective view showing the linking means, FIG. 6 is an exploded perspective view showing the arm constituting the aircraft height detection device, and FIG.
The figure is a diagram showing a hydraulic circuit. Furthermore, FIG. 8 is a perspective view showing the second operating (main clutch) lever and the first operating (planting clutch) lever, and FIG. 9 is 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, Fig. 12 is an illustration of the operation in the automatic state of only lowering the aircraft, and Fig. 13 is an illustration of the operation in the automatic state of only lowering the aircraft. FIG. 14 is an explanatory diagram of the operation in the fixed state, and FIG. 14 is an explanatory diagram of the operation in the manually raised state. Further, 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 manual lowering state. 1... Walking type mobile agricultural machine for rice fields (rice transplanter), 5...
... Airframe, 13 ... Swinging member chain case, 15
...Paddy wheel, 16...Hydraulic actuator, 1
7...Switching valve, 20...Linking means, 20
a, 20b... play mechanism (long hole), 25... second
operating lever (main clutch) lever, 26...first operating lever (work planting) clutch lever,
6,29-35... Aircraft height detection mechanism, A, D...
...In position, B, E...Out position, C, F, H, G...
...Further rotation positions.

Claims (1)

[Scope of Claims] 1. A first operation lever connected to a working clutch and a second operation lever connected to a running clutch, and a swinging member swingably supported by the fuselage body, which is connected to a paddy field. A wheel is provided, the swinging member is further connected to a hydraulic actuator, a switching valve communicating with the hydraulic actuator is connected to a body height detection mechanism, and the switching valve is switched between a raised position, a lowered position and a neutral position. In a walking-type mobile agricultural machine for paddy fields configured to be able to automatically control the height of the machine, the switching valve is connected to the first and second operating levers via a linking means having a play mechanism, An operating device for a walking type mobile agricultural machine for paddy fields, wherein the switching valve is switched to the raised position based on the operation of the first operating lever, and the height of the machine can be manually raised.