JP2002084830A - Implement driving structure for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitution with which an implement is driven to make horizontal and rolling motions by properly detecting the height from the ground to the implement and the angle of the implement in the right and left direction to the ground. SOLUTION: This implement driving structure for a working vehicle is liftably equipped with the right and left ground bodies at the right and left side parts of the implement and furnished with right and left transmission mechanisms 27 for mechanically taking out lifting and lowering actions of the right and left ground bodies on the implement, an average mechanism 35 for mechanically averaging the lifting and lowering actions transmitted from the right and left transmission mechanisms 27 and an inclination detection means 43 for electrically detecting a difference in lifting and lowering actions transmitted from the right and left transmission mechanisms 27. A control valve is operated by the lifting and lowering actions averaged by the average mechanism 35 and the implement is subjected to lifting and lowering drives by a lifting and lowering cylinder and the implement is subjected to a rolling drive by an electrically-driven actuator based on the detected value of the inclination detection means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle equipped with a working device on a machine body, and more particularly to a structure for raising and lowering and rolling drive of the working device with respect to the machine body.

[0002]

2. Description of the Related Art As described above, in a working vehicle in which a working device is supported on a machine body such that the working device can be lifted and lowered and rolled freely,
Right and left grounding bodies (for example, sleds and grounding floats) are provided on the right and left sides of the working device so as to be movable up and down, and the vertical position of the right grounding body with respect to the working device and the left grounding body with respect to the working device Are configured to be electrically detected. Accordingly, the average value of the vertical position of the right grounding body with respect to the working device and the vertical position of the left grounding body with respect to the working device is calculated, and the average value is used as the height from the work place to the working device to drive the working device up and down. I do. The difference between the vertical position of the right ground contact body with respect to the work device and the vertical position of the left ground contact body with respect to the work device is calculated, and the difference is used as the horizontal angle of the work device with respect to the work place to drive the work device in rolling.

[0003] With this configuration, when the working device moves up and down or rolls with respect to the work site (the right and left grounded objects) in a state where the right and left grounding members are in contact with the work site, the right and left of the working device are adjusted. As the vertical position of the left ground contact body changes, the height from the work place to the work equipment and the angle of the work equipment in the horizontal direction with respect to the work place are calculated as described above, and the work equipment is driven up and down and rolling. By driving, the working device can be maintained at the set height from the work place, and the horizontal angle of the work device with respect to the work place can be maintained at the set angle.

[0004]

When the above-mentioned work vehicle travels on a work site while operating the work device, a lot of mud and water adhere to the work device. If the vertical position of the right grounding member with respect to the working device and the vertical position of the left grounding member with respect to the working device are electrically detected, there is room for improvement in terms of durability. The present invention relates to a working device drive structure of a working vehicle in which a working device is supported in a vertically movable manner and a rolling drive with respect to an airframe, and a height from a work place to a work device, and an angle of the work device in the left-right direction with respect to the work place. An object of the present invention is to provide a configuration in which the work apparatus can be appropriately detected and driven up and down and rolled.

[0005]

According to a first aspect of the present invention, the right and left grounding members are provided on the right and left portions of the working device so as to be able to move up and down, and the right grounding member with respect to the working device can be raised and lowered. It has a right transmission mechanism for mechanically extracting and transmitting the operation, and a left transmission mechanism for mechanically extracting and transmitting the raising and lowering operation of the left grounding body with respect to the working device. Thereby, according to the feature of claim 1, while maintaining the durability even if a lot of mud or water adheres to the working device, the right and left transmitting mechanisms of the right and left grounding bodies with respect to the working device are maintained by the right and left transmission mechanisms. The lifting operation (up and down position) can be appropriately taken out, and the height from the work place to the work device and the angle of the work device in the left-right direction with respect to the work place can be taken out properly.

[II] Regarding the lifting and lowering drive of the working device,
Since a heavy working device is to be lifted, it is often configured to be hydraulically driven by a lifting cylinder which easily generates a sufficient driving force. According to the features of claim 1, a lifting cylinder that drives a working device provided in the body up and down,
An averaging mechanism for mechanically averaging the vertical movement transmitted from the right transmission mechanism and the vertical movement transmitted from the left transmission mechanism according to the above [I] is provided. The control valve is operated by the elevating operation (height from the work place to the working device), the hydraulic oil from the control valve is supplied to the elevating cylinder, and the working device is driven up and down by the elevating cylinder. I have.

According to the first aspect of the present invention, when the working device is configured to be vertically movable by the lifting cylinder, the height from the work place to the working device is determined by the right and left transmission mechanisms and the averaging mechanism. Therefore, the working valve is mechanically transmitted to the control valve via the control valve, so that the lifting / lowering of the working device by the lifting / lowering cylinder can be appropriately performed while maintaining durability.

[III] For example, in a riding type rice transplanter which is an example of a work vehicle, a link mechanism is connected to the body so as to be able to move up and down.
In many cases, a seedling planting device is connected to the end of the link mechanism so as to be freely rotatable. An elevating cylinder is provided between the machine body and the link mechanism, and the elevating cylinder drives the link mechanism to drive the seedling. In many cases, the attachment device is driven up and down (hence, when the hydraulic oil of the pump provided in the machine body is supplied to the elevating cylinder, since the elevating cylinder is also provided in the machine body, it is easy to arrange the hydraulic oil piping and the like. ). On the other hand, when the seedling planting device is configured to be driven to roll with respect to the body (link mechanism), if a rolling cylinder is provided between the end of the link mechanism and the seedling planting device, the pump of the machine body will be turned off. The hydraulic oil pipe must be connected to the rolling cylinder while being attached to the link mechanism (which is driven up and down).

According to the first aspect of the present invention, there is provided an electric actuator for rollingly driving the working device, and the lifting / lowering operation transmitted from the right transmission mechanism and the left transmission mechanism transmitted from the left transmission mechanism according to the above [I]. An inclination detecting means for electrically detecting a difference in the elevating operation is provided, and the working device is configured to be driven to be rolled by an electric actuator based on a detection value of the inclination detecting means. Rolling drive of a working device that tilts the working device to the right or left while the weight of the working device is supported requires too much driving force, as opposed to lifting and lowering the working device that lifts a heavy working device. Therefore, the working device can be sufficiently driven for rolling by the electric actuator. In this case, even if the electric actuator is provided at a position away from the machine body (for example, in a riding type rice transplanter, even if the electric actuator is provided between the end of the link mechanism and the seedling planting device as described above). In addition, arranging the wiring from the airframe to the electric actuator can be performed more easily than the case of arranging the piping for the hydraulic oil.

[IV] According to the feature of claim 2, similar to the case of claim 1, the "action" described in the above-mentioned [I], [II], and [III] is provided. It has various “actions”. According to the feature of claim 2, the right and left transmission mechanisms are constituted by wires, the averaging mechanism is constituted by a moving pulley whose rotation axis moves while rotating, and the wire is wound around the moving pulley, The movement of the rotating shaft is transmitted to the control valve, and the control valve is operated by a relatively simple device such as a wire or a moving pulley.

[V] According to the features of claim 3, claim 1
Or, in the same manner as in the case of 2, it has the “action” described in the preceding items [I] to [IV], and additionally has the following “action”. According to the features of claim 3, the averaging mechanism, the control valve and the inclination detecting means are provided in the body,
Mud, water, and the like are less likely to adhere to the averaging mechanism, the control valve, and the inclination detecting means than in the configuration in which the averaging mechanism, the control valve, and the inclination detecting means are provided in the working device.
Further, since the averaging mechanism and the control valve can be brought closer to each other, the ascending and descending operation (the height from the work place to the working device) averaged by the averaging mechanism is appropriately transmitted to the control valve. Such a configuration can be easily performed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [1] As shown in FIG. 1, an engine 3 and a driving unit 4 are arranged on a body supported by a front wheel 1 and a rear wheel 2 which can be steered right and left. A fertilizer application device 14 is provided at a rear portion of the unit 4, and a seedling planting device 6 is connected to a rear portion of the body via a parallel quadruple link mechanism 5 so as to be able to move up and down, and a hydraulic cylinder that drives the link mechanism 5 to move up and down 7 is provided to constitute a riding type rice transplanter which is an example of a work vehicle. The front-rear axis P1 at the lower rear end of the link mechanism 5
The seedling planting device 6 is supported around the periphery so as to be freely rollable, and a motor 34 for driving the seedling planting device 6 to roll with respect to the machine body is provided at the upper rear end of the link mechanism 5.

As shown in FIG. 1, the seedling planting device 6 is configured in a ten-row planting type, and includes a plurality of planting transmission cases 9, a rotating case 10 that is driven to rotate at the rear of the planting transmission case 9, and a rotating case. A pair of planting claws 11 supported by the plant 10 and a seedling rest 8 driven in a reciprocating and transverse manner by a predetermined stroke are provided. (Not shown), and right and left side floats 12 are provided laterally outside the right and left leveling floats. With the above configuration, the rotation of the rotating case 10 causes
The planting claws 11 are configured so that the seedlings are alternately taken out from the lower part of the seedling placing stand 8 and planted on the rice field G.

As shown in FIG. 1, the fertilizer applicator 14 is provided with a horizontally long fertilizer storage hopper 15, and a feeding section 16 connected to a lower portion of the fertilizer storage hopper 15, and includes right and left leveling floats, right and left floats. The groove forming device 17 supported by the side float 12 and the feeding portion 16 are connected by a hose 18. Thereby, a groove is formed in the rice field G by the groove producing device 17 with the planting of the seedling, and the fertilizer fed out from the fertilizer storage hopper 15 through the feeding portion 16 is supplied to the rice field via the hose 18 and the groove producing device 17. G is supplied to the groove.

As shown in FIG. 1, while traveling in one planting process, right and left markers 23 for forming an index of the next planting process on the rice field G are provided on the right and left sides of the seedling planting device 6. It is provided on the left side. The right and left markers 23 have the tip
A spring (not shown) is supported so as to swing over a downward contact position (state where an index is drawn on the rice field G as the vehicle travels) and an upward storage position where the tip is raised from the rice field G. ) To the ground position.

When the seedling planting device 6 is driven to move up significantly,
The right and left markers 23 are moved to the storage positions by wires (not shown), and the right and left locking mechanisms (not shown) are used.
, The right and left markers 23 are held at the storage positions. As shown in FIG.
The right or left marker 23 is moved to the ground contact position by releasing the right or left lock mechanism by the lifting lever 29 arranged on the right side of the right as described later.

[2] Next, the right and left side floats 1
The second support structure will be described. As shown in FIGS. 9 and 10, a support shaft 13 is rotatably supported at a lower portion of the planting transmission case 9, and a plurality of support arms 20 are provided from the support shaft 13.
Extends rearward, and the horizontal axis P of the support arm 20 is
The right and left terrain floats and the rear portions of the right and left side floats 12 are supported so as to freely swing up and down.
An implantation depth lever (not shown) is connected to the support shaft 13, and the angle of the support shaft 13 and the support arm 20 is changed by the implantation depth lever to change the position of the horizontal axis P2 up and down. Change the planting depth of the seedlings.

As shown in FIGS. 9 and 10, a balance-shaped support arm 24 is supported around a horizontal axis P3 of a bracket 22 fixed to a fixed portion of the seedling planting device 6 so as to be vertically swingable. An arm 13 a fixed to the support shaft 13 is inserted into a long hole 24 a of the support arm 24. A vertically long frame 25 is swingably supported around the horizontal axis P4 at the front part of the right and left side floats 12, and a pin 24 b of the support arm 24 is inserted into a long hole 25 a of the frame 25. The end of the outer 27b of the wire 27 is
And an inner 27a of a wire 27 is connected to a pin 24b of the support arm 24 via a spring 26.

With the above structure, when the seedling planting apparatus 6 moves up and down with respect to the right and left side floats 12 following the ground surface G by touching the ground, the right and left side floats 12 move rightward with respect to the seedling planting apparatus 6. And the left side float 12 swings up and down around the horizontal axis P2.
With respect to a (connected to the pin 24b of the support arm 24), the outer 27b of the wire 27 is moved vertically. Thereby, the height from the rice field G (the right side float 12) to the right side of the seedling planting device 6,
Further, the height from the rice field G (the left side float 12) to the left side of the seedling planting device 6 is taken out by the inner 27a of the right and left wires 27.

[3] Next, a description will be given of taking out the height from the rice field G to the seedling planting device 6 (the center in the left and right direction) and taking out the angle of the seedling planting device 6 with respect to the rice field G in the left-right direction. As shown in FIGS. 3, 11, and 12, a portal-shaped support bracket 30 is fixed to the body frame 28 when viewed from the front, and a support bracket 31 formed by bending a flat plate into a U-shape (see FIG. 12) is a support bracket. The support bracket 31 has an elongated hole 31a. A pulley 35 is rotatably supported by a U-shaped bracket 32 via a pin 33, and the pin 33 is inserted into an elongated hole 31 a of the support bracket 31. Thereby, the pulley 35 is rotatably supported by the bracket 32 and the pin 33 (rotation), and the elongated hole 31 of the support bracket 31 is provided.
It is movably supported along a. An end of the outer 21b of the wire 21 is fixed to the support bracket 31,
The inner 21 a of the wire 21 is connected to the bracket 32.

As shown in FIGS. 3, 11 and 12, a gate-shaped support bracket 37 is fixed to the body frame 28 when viewed from the front, and a U-shaped left detection arm 41 is mounted on the support bracket 37 when viewed from the top. A rotary type potentiometer 43 is attached to the left detection arm 41 so as to be swingable around the horizontal axis P5. Potentiometer 43
The detection shaft 43a projects from the side of the left detection arm 41, and the detection shaft 43a of the potentiometer 43 is
Are connected, the operation shaft 44 protrudes from the side surface of the support bracket 37, and the right detection arm 40 is attached to the operation shaft 44.

As shown in FIGS. 3, 11, and 12, a support bracket 45 fixed to a body frame (not shown)
The outer 27b (the right and left side floats 12) of the right and left wires 27 (see FIG. 9) is fixed, the inner 27a of the right wire 27 is connected to the right detection arm 40, and the left wire 27 is connected. Is connected to the left detection arm 41. Wire 47 is pulley 3
5, one end of the wire 47 is connected to the right detection arm 40, and the other end of the wire 47 is connected to the left detection arm 41.

With the above structure, when the right and left side floats 12 are in contact with the rice field surface G and the seedling planting device 6 (left and right center portions) moves up and down, the seedling planting device 6 (left and right center portions) is moved.
The right and left side floats 12 move up and down by the same amount with respect to each other.
Are pushed and pulled by the same amount as each other. Thereby, the pulley 35 is connected to the support bracket 31 via the right and left detection arms 40 and 41 and the wire 47.
Move along the long hole 31a of the
1a is pushed and pulled, and the seedling planting device 6
(The center to the left and right) is the inner 21 of the wire 21
It is taken out as the position of a. In this case, the inner and outer wires 27a of the right and left wires 27 are pushed and pulled by the same amount, and the right and left detection arms 40 and 41 swing by the same angle. Has not changed.

In a state where the right and left side floats 12 are in contact with the rice field surface G, for example, the seedling plant 6 is tilted to the right,
When the right side float 12 approaches the seedling planting device 6 and the left side float 12 separates, the inner wire 27a of the right wire 27 is pulled, and the inner wire 27a of the left wire 27 is pushed. Is done. As a result, the right and left detection arms 40 and 41 swing in opposite directions, and the detection value of the potentiometer 43 changes, and the angle of the seedling planting device 6 with respect to the rice field G in the left-right direction is adjusted by the potentiometer. It is taken out as 43 detected values.

In this case, the right and left side floats 12
When the seedling planting device 6 (left and right central portions) moves up and down while the seedling planting device 6 is tilted right (left) in a state in which the plant is in contact with the rice field G, the pulley 35 is moved by the right and left wires 27 and 47. Function as a pulley, and the seedling planting device 6
Right and left side floats 12 for (left and right center)
Of the vertical movement of the wire 27 is averaged (the push / pull operation amount of the inner 27a of the right and left wires 27 is averaged), and the height from the rice field G to the seedling planting device 6 (the center in the left and right directions) is the wire 21.
Is taken out as the position of the inner 21a. As described above, the height from the rice field G to the seedling planting device 6 (the center in the left and right directions) is taken out as the position of the inner 21a of the wire 21. Is taken out as a detection value of the potentiometer 43.

[4] Next, the structure near the raising / lowering lever 29 for driving the raising and lowering of the seedling planting apparatus 6 will be described. FIG.
The lifting lever 29 is disposed on the right side of the driver's seat 19 as shown in FIG. 5, and as shown in FIGS. 5, 6, and 7, a support shaft 38 is provided around a horizontal axis P7 of a support member 36 fixed to the body. Are rotatably supported, and an operation plate 39 is fixed to an end of the support shaft 38. The axis P of the bracket 39a of the operation plate 39
8, a support shaft 42 is rotatably supported, and the support shaft 4
The lifting lever 29 is fixed to 2. Lift lever 29
, A raised position, a neutral position, a lowered position, and a planting position are set in the lever guide 70. An arm 50 is fixed to an intermediate portion of the support shaft 38, and a spring cylinder 51 urged to the extension side is connected between the fixed portion of the body and the arm 50, and the elevating lever 29 is urged to the ascending position. I have.

As shown in FIGS. 5, 6, 7, and 8, a support shaft 48 is rotatably supported around a horizontal axis P9 of the support member 36, and a balance arm 49 is fixed to an end of the support shaft 48. The inner end of the wire 21 is attached to the lower end of the balance arm 49.
a (see the previous section [3] and FIGS. 3, 11, and 12). A bolt 52 is rotatably supported at the upper end of the balance arm 49, and a ball 53 is fixed to the tip of the bolt 52, and the contact portion 5 extending downward from the arm 50.
The ball 53 is configured to abut on 0a.

As shown in FIGS. 2 and 4, a control valve 55 for supplying and discharging hydraulic oil to and from the hydraulic cylinder 7 (see FIG. 1) is provided at the front of the body, and a spool 55a of the control valve 55 is provided with a spring 55b. 4 (the left side of the sheet of FIG. 4) (the extension side of the hydraulic cylinder 7 and the downward side of the seedling plant 6), and pushes the spool 55a of the control valve 55 to the right of the sheet of FIG. A balance arm 56 for operation (a contraction side of the hydraulic cylinder 7 and a rising side of the seedling planting device 6) is provided. Figures 2, 4,
As shown in FIGS. 6 and 8, an arm 54 is fixed to the end of the support shaft 48, and a link rod 57 is connected between the balance arm 56 and the arm 54.

As shown in FIGS. 2 and 4, a first linking member 59 and a second linking member 60 made of a plate material are supported around a fixed support shaft 58 so as to be swingable independently of each other. A link rod 61 extends between the long hole 39 b of the 39 and the first link member 59. The feeding section 16 (FIG. 1)
), And a link rod 63 is connected across the first linking member 59, and a spring for urging the fertilizer clutch 62 to a disengaged position (transmission cutoff operation). 65 is attached to the first linking member 59. The seedling planting device 6 (see FIG. 1) is provided with a planting clutch 64 for transmitting and transmitting power, and a rocking mechanism for operating the planting clutch 64 to an on position (transmission operation) and a disengagement position (transmission interruption operation). A link rod 67 extends over the movable crank arm 66 and the second link member 60.
The distal end of the link rod 61 is inserted into the long hole 60a of the second linking member 60, and a spring 68 for urging the planting clutch 64 to the disengagement position is attached to the second linking member 60. .

As shown in FIGS. 5 and 8, three concave portions 39e and one convex portion 39d are provided at the lower portion of the operation plate 39, and are held swingably around the horizontal axis P10 of the support member 36. The arm 74 is supported, and the holding arm 74 is
A spring 75 that biases the side is provided. This allows
The roller 74a of the holding arm 74 is positioned in the recess 3 of the operation plate 39.
9e, the elevating lever 29 is held at the neutral position, the lowered position, and the planting position, and the urging force of the spring cylinder 51 and the roller 74 of the holding arm 74 are held.
When a contacts the convex portion 39d of the operation plate 39, the elevating lever 29 is held at the ascending position.

[5] Next, the case where the lifting lever 29 is operated to the neutral position and the lowered position will be described. Figure 2
The states shown in 4, 5, and 6 are states in which the elevating lever 29 is held at the neutral position by the holding arm 74. In this state, the bolt 52 and the ball 53 of the balance arm 49 contact the contact portion 50a of the arm 50, and the balance arm 49
And the control valve 55 is held at the neutral position, and the hydraulic cylinder 7
Is stopped. In this case, when the seedling planting device 6 is located above the rice field G, the right and left side floats 12
Swings downward so that the inner 21a of the wire 21 is pushed toward the balance arm 49 side, and the balance arm 49
5, the bolt 52 and the ball 53 of the balance arm 49 come into contact with the contact portion 50a of the arm 50, and the balance arm 49 and the control valve 55 are rotated.
Is held in the neutral position. With the lifting lever 29 being operated to the neutral position in this way, the planting clutch 64 and the fertilizing clutch 62 are operated to the disengaged position, and the seedling planting device 6 is operated.
And the fertilizer application device 14 (the feeding part 16) is stopped,
The motor 34 has stopped.

When the raising / lowering lever 29 is operated from the neutral position to the lowering position, the contact portion 50a of the arm 50 is
Since the bolts 52 and the balls 53 of FIG. 9 are separated to the left of the paper of FIG. 6, when the seedling planting device 6 is located above the rice field G as described above, the right and left side floats 12 swing downward. The inner arm 21a of the wire 21 is pushed to the balance arm 49 side, the balance arm 49 swings counterclockwise in FIG. 5, and the control valve 55 is operated to the lowered position. Thus, the hydraulic cylinder 7 is extended and the seedling planting device 6 is driven downward. Even if the elevating lever 29 is operated from the neutral position to the lowered position, the planting clutch 64 and the fertilizing clutch 6
2 is still in the cutting position and is not operated in the entering position.

As described above, when the seedling planting device 6 is driven downward and the right and left side floats 12 touch the rice field surface G, the right and left side floats 12 are lifted. When the inner 21a is pulled, the balance arm 49 swings clockwise in FIG.
The control valve 55 is operated to the neutral position, and the hydraulic cylinder 7 stops.

Thereafter, when the seedling planting device 6 is moved up and down with respect to the right and left side floats 12 following the ground surface G by the vertical movement of the body, as described in the above item [3], From the seedling planting device 6 (left and right central part)
It is taken out as the position of the inner 21a of the wire 21, the control valve 55 is operated to the raised and lowered positions, the hydraulic cylinder 7 is extended and retracted, and the seedling planting device 6 is maintained at the set height from the rice field G. It is automatically driven up and down.

When the seedling planting device 6 is tilted right or left due to the vertical movement of the machine body, etc., the detection value of the potentiometer 43 changes as described in the above item [3]. The motor (34) is driven by the control device (not shown) so that the seedling planting device 6 moves to the original position (the right and left detection arms 40, 41 become parallel to each other). The roller is automatically driven to be parallel.

[6] Next, the case where the lifting lever 29 is operated to the planting position will be described. When the elevating lever 29 is operated to the planting position, the link rod 61 is operated by the operation plate 39 downward in the plane of FIG. 4, and the fertilizer application clutch 62 is operated to the engagement position via the first link member 59 and the link rod 63. Then, the fertilizer starts to be fed from the feeding section 16.
Along with this, due to the accommodating action of the long hole 60a of the second linking member 60, the planting clutch 64 is moved through the second linking member 60 and the linking rod 67 slightly after the fertilizer application clutch 62 is operated to the entry position. By operating to the entry position, seedling planting by the seedling planting apparatus 6 is started. The reason why the fertilizer application clutch 62 is operated to the entry position slightly earlier than the planting clutch 64 in this way is that the feeding portion 16 is at a position higher than the rice field surface G as shown in FIG. 1 and the fertilizer is fed from the feeding portion 16. Since it takes a little time to reach the rice field G from, the fertilizer is supplied to the rice field G without delay when the seedling is planted by the seedling planting device 6 (planting claw 11). is there.

When the raising / lowering lever 29 is operated to the planting position as described above, planting of seedlings by the seedling planting device 6 and supply of fertilizer to the rice field G by the fertilizing device 14 are performed. As described, the seedling planting device 6
The seedling planting device 6 is automatically driven to move up and down so as to be maintained at the set height from above, and is automatically driven to roll so as to be parallel to the rice field G, so that the planting depth of the seedling is set to the set value. Is maintained.

When changing the planting depth of the seedling, the angle of the support shaft 13 and the support arm 20 is changed by the planting depth lever, as described in the above item [2] and shown in FIGS. The position of the horizontal axis P2 is changed up and down, and the support arm 24 is vertically swung around the horizontal axis P3 by the arm 13a of the support shaft 13, so that the frame 25 and the wire 2
The position of 7 is also changed up and down in the same direction as the horizontal axis P2.
In this manner, the front and rear positions of the right and left leveling floats and the right and left side floats 12 are vertically changed by the planting depth lever in a direction substantially parallel to the seedling planting device 6. Thereby, the set height (planting depth of the seedling) from the rice field G at which the seedling planting device 6 is maintained is changed.

As described in the above item [1], the seedling planting device 6
Is greatly driven upward, the right and left markers 2
3 is held in the storage position, and the seedling planting device 6
Even if the marker 23 is lowered, the right and left markers 23 are held at the storage positions by the right and left lock mechanisms. When the elevating lever 29 is operated to the planting position as shown in FIG. 2, the lower end 29 a of the elevating lever 29 is engaged with the operation member 76. Thus, when the elevating lever 29 is operated right or left from the planting position, the operating member 76 is operated by the elevating lever 29.
Is operated in the left-right direction, the right or left locking mechanism is released, and the right or left marker 23 is operated from the storage position to the ground position.

[7] Next, the case where the lifting lever 29 is operated to the raised position will be described. When the elevating lever 29 is moved from the planting position to the ascending position, the arm 50 swings counterclockwise in FIG. 6 and the contact portion 50a of the arm 50 forces the balance arm 49 clockwise in FIG. , The control valve 55 is operated to the raised position, the hydraulic cylinder 7 is contracted, and the seedling planting device 6 is driven to be raised. In this case, when the elevating lever 29 is operated from the planting position to the lowering position halfway, the first linking member 59 is actuated by the spring 65.
Then, the fertilizer application clutch 62 is operated to the disengagement position via the linkage rod 63, and the fertilizer application device 14 (the feeding part 16) stops.

In the planting clutch 64, the rotating case 10 (see FIG. 1) does not assume a predetermined posture substantially parallel to the rice field surface G (the posture in which both the planting claws 11 of the rotating case 10 are located above the rice field surface G). And the planting clutch 64 is not operated to the disengagement position. Therefore, even if the first linking member 59 swings clockwise in FIG. After the rotating case 10 (see FIG. 1) is brought into a predetermined position substantially parallel to the rice field surface G by the flexibility of the long holes 60a of the 60, the planting clutch 64 is operated by the springs 68 and 69 to the disengagement position, and the seedling is planted. The attachment device 6 stops.

As shown in FIGS.
A link rod 81 is bridged between the long hole 39c of 9 and the link mechanism 5. With this configuration, the lifting and lowering of the link mechanism 5 is not affected by the elevating and lowering lever 29 due to the flexibility of the elongated hole 39c of the operation plate 39. However, as described above, the raising and lowering lever 29 is operated to the raised position. Seedling planting device 6 (link mechanism 5) driven up in the state
Reaches the upper limit position, the lifting lever 29 is operated from the raised position to the neutral position by the pressing action of the link rod 81 on the operation plate 39, and the seedling planting device 6 (link mechanism 5 and hydraulic cylinder 7) is moved to the upper limit position. Stop at

For traveling, a hydrostatic continuously variable transmission (not shown) is provided on the forward side and the reverse side that can continuously change the speed. As shown in FIG. (Not shown) for operating the shift lever 82 to move forward and backward.
Is provided. As shown in FIGS. 2, 4, and 5, a wire 83 is connected to the holding arm 74, and
When the gear 2 is operated in the reverse direction, the shift lever 82 and the wire 83 are pulled so that the wire 83 is pulled toward the shift lever 82.
And are linked.

As a result, the lifting lever 29 is moved to the neutral position,
When the shift lever 82 is operated to the reverse side in the state of being operated to the lowering position and the planting position, the holding arm 74 swings clockwise in FIG.
Since the fourth roller 74a is separated from the concave portion 39e of the operation plate 39, the lift lever 29 is operated to the raised position by the spring cylinder 51.

[8] Next, as described in the above items [5] and [6], when the seedling planting device 6 is automatically driven up and down and rolling, the sensitivity setting lever 46 for setting the control sensitivity is set. The structure in the vicinity will be described. Figures 4, 6, 7
As shown in FIG. 7, the sensitivity setting lever 46 is inserted into the vertically long hole 90a of the support plate 90 and the vertically long hole 84a of the fixed bracket 84, and the end of the sensitivity setting lever 46 is pulled downward. A biasing spring 86 is provided. A plurality of recesses (not shown) are formed in the lever guide 70 (see FIG. 5).
The sensitivity setting lever 46 is urged by the spring 86 so as to enter the concave portion of the lever guide 70 by using the long hole 84a of the bracket 84 as a fulcrum, and the sensitivity setting lever 46 enters the concave portion of the lever guide 70. so,
The attitude of the sensitivity setting lever 46 is set.

As shown in FIGS. 4, 6, and 7, a positioning member 87 is fixed to the sensitivity setting lever 46, a support member 88 is fitted around the sensitivity setting lever 46 so as to be relatively rotatable, and the outer 21b of the wire 21 is A spring 89 that is attached to the support member 88 and urges the support member 88 clockwise in FIG. 6 with respect to the sensitivity setting lever 46 is externally fitted to the sensitivity setting lever 46. Thus, the support member 88 comes into contact with the bent portion 87 a of the positioning member 87 by the urging force of the spring 89, so that the attitude of the support member 88 with respect to the sensitivity setting lever 46 is set.

With the above configuration, when the sensitivity setting lever 46 is operated to the insensitive side to be held in the concave portion of the lever guide 70, the length of the inner 21a of the wire 21 protruding on the balance arm 49 side as shown in FIG. The length of the inner 21a of the wire 21 on the right and left side floats 12 increases as shown in FIG. Accordingly, in a state where the lifting lever 29 is operated to the lowering and planting positions, the right and left side floats 12 are stabilized in the upward posture (neutral state), so that the right and left side floats 12 move to the rice field surface G. The contact area becomes smaller. Accordingly, the right and left side floats 12 are in a state of actively crushing the mud on the rice field G, and the sensitivity of the right and left side floats 12 to follow the ground on the rice field G (elevation drive and rolling drive). (Control sensitivity) becomes insensitive, and this state is suitable when the mud on the rice field G is hard.

When the sensitivity setting lever 46 is operated to the sensitive side to be held in the concave portion of the lever guide 70, as shown in FIG.
a becomes longer, and as shown in FIG. 9, the inner 2 of the wire 21 on the right and left side floats 12 side.
The length of 1a is shortened. Thus, the lifting lever 2
9 is operated in the lowered and planted position, the right and left side floats 12 are stabilized (neutral state) in a downward posture, so that the surface G of the right and left side floats 12
The contact area to the contact increases. Therefore, the right and left side floats 12 sensitively respond to the unevenness of the rice field surface G, and the sensitivity of the right and left side floats 12 to follow the ground surface G on the rice field surface G (the control sensitivity of the vertical drive and the rolling drive) becomes sensitive. This state is suitable when the mud on the rice field G is soft.

In the structure shown in FIGS. 4, 6 and 7, for example, if the right or left side float 12 rides on a large block of mud and the right or left side float 12 swings largely upward, the wire 21 Is largely pulled. In such a state, the balance arm 49 and the control valve 55 (spool 55a) are first moved to the raised position by pulling the inner 21a of the wire 21, as shown in FIGS. When the inner 21a of the wire 21 is further pulled, the balance arm 49 and the control valve 55 (spool 55a) are not operated beyond the raised position, so that the support member 88 is moved against the sensitivity setting lever 46 against the spring 89. Swings counterclockwise in FIG.
By moving the outer 21b of the wire 21 to the right in FIG. 6, the pulling operation of the inner 21a of the wire 21 is absorbed.

For example, the right and left side floats 12 enter the large recesses, and
Is largely swung downward, the inner 21a of the wire 21 is pushed greatly toward the balance arm 49 side.
In such a state, as shown in FIGS. 4 and 6, the balance arm 49 and the control valve 55 (spool 55a) are first moved to the lowered position by pushing the inner 21a of the wire 21. Further, when the inner 21a of the wire 21 is pushed, the balance arm 49 and the control valve 55 (spool 55a) are not operated beyond the lowered position, so that the inner 21a of the wire 21 is loosened on the balance arm 49 side. The pressing operation of the inner 21a of the first 21 is absorbed.

[Another Embodiment of the Invention] In the above-mentioned [Embodiment of the Invention], a configuration shown in FIGS. 13 and 14 may be used instead of the configuration shown in FIGS. As shown in FIGS. 13 and 14, the pulley 35 is configured in a two-stage type, the pulley 35 is fixed to the pin 33, and the pin 33 is rotatably supported by the bracket 32. The pin 33 is movably supported along. The inner 27a of the right and left wires 27 are connected in series, and a two-stage type pulley 35 is provided.
A potentiometer 43 for detecting the rotation angle of the pin 33 with respect to the bracket 32 is attached to the bracket 32. The support member 69 is attached to the body frame 28.
Is fixed, and the rear part of the support bracket 31 is
9 is fixed to the rear part by bolts 71, the front end part 69a of the support member 69 is engaged with the front part of the support bracket 31, and the support bracket 31 is supported. Figure 1
Instead of the right and left side floats 12 shown in FIGS. 9 and 10, a sled-shaped grounding body formed by bending a plate material may be used. The present invention can be applied not only to a riding type rice transplanter but also to a riding type direct sowing machine, a riding type chemical sprayer and the like.

[0052]

According to the first aspect of the present invention, in a working device drive structure of a working vehicle in which a working device is supported on a machine body such that the working device can be lifted and lowered and rolled, the right and left grounding members with respect to the working device can be moved up and down. The right and left transmission mechanisms to mechanically take out and transmit the work, it is possible to appropriately take out the height from the work place to the work equipment and the angle in the left-right direction of the work equipment with respect to the work place, In addition, the height from the work place to the work device is mechanically transmitted to the control valve via the right and left transmission mechanisms and the averaging mechanism, thereby raising and lowering the work device by the lifting cylinder. This makes it possible to perform lifting and lowering driving and rolling driving of the working device while maintaining durability.

According to the features of the first aspect, it is noted that the rolling drive of the working device for tilting the working device to the right or left while the weight of the working device is supported does not require a very large driving force. Therefore, by configuring the working device to be driven by rolling by the electric actuator, even if the electric actuator is provided at a position distant from the machine body, wiring can be easily arranged from the machine body to the electric actuator. This is advantageous in terms of simplification.

According to the features of the second aspect, the "effect of the invention" of the first aspect is provided similarly to the case of the first aspect. In addition to the "effect of the invention", the following "invention" is provided. Of the effect. According to the feature of claim 2, the right and left transmission mechanisms are constituted by wires, the averaging mechanism is constituted by a moving pulley whose rotation axis moves while rotating, and the wire is wound around the moving pulley, The structure is such that the control valve is operated by a relatively simple device, such as transmitting the movement of the rotary shaft to the control valve, which is advantageous in terms of simplification of the structure. became.

According to the feature of claim 3, claim 1 or 2
"Effects of the Invention" of Claim 1 or 2 as in the case of
In addition to this “effect of the invention”, the following “effect of the invention” is provided. According to the feature of the third aspect, it is difficult for mud and water to adhere to the averaging mechanism, the control valve and the inclination detecting means, and the lifting and lowering operation averaged by the averaging mechanism (from the work place) (Height to the working device) can be easily transmitted to the control valve, so that the durability and operation performance of the lifting and lowering drive and the rolling drive of the working device can be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a side view of the vicinity of a lifting lever and a planting clutch.

FIG. 3 is a side view of the vicinity of the moving pulley and the potentiometer.

FIG. 4 is a diagram showing a linked state of a lifting lever, a control valve, a planting clutch, and a fertilizing clutch.

FIG. 5 is a side view of the vicinity of a lifting lever.

FIG. 6 is a side view showing a linked state of a lifting lever, a balance arm, and a sensitivity setting lever.

FIG. 7 is a cross-sectional plan view of the vicinity of a base of a lifting lever and a sensitivity setting lever.

FIG. 8 is a cross-sectional plan view near the base of the lifting lever.

FIG. 9 is a vertical sectional front view of right and left side floats.

FIG. 10 is a side view of the rear part of the right and left side floats.

FIG. 11 is a cross-sectional plan view near the moving pulley and the potentiometer.

FIG. 12 is a longitudinal sectional side view showing the vicinity of a moving pulley and a potentiometer.

FIG. 13 is a cross-sectional plan view of the vicinity of the moving pulley and the potentiometer according to the first alternative embodiment of the present invention.

FIG. 14 is a longitudinal sectional side view showing the vicinity of a moving pulley and a potentiometer according to the first alternative embodiment of the present invention;

[Explanation of symbols]

 Reference Signs List 6 working device 7 lifting cylinder 12 grounding body 27 transmission mechanism, wire 33 rotating shaft 34 electric actuator 35 averaging mechanism, moving pulley 43 inclination detecting means 55 control valve

Continued on the front page F term (reference) 2B062 AA01 AA09 AA14 AB01 AB07 BA68 CA08 2B304 KA02 KA04 KA11 LA02 LA09 LB05 LB16 MA08 MB02 MC06 PC08 QA11 QA26 QB04 QC03 QC14 RA03

Claims (3)

[Claims] 1. A lifting cylinder for driving a working device provided on a body of a vehicle up and down, and an electric actuator for driving the working device in a rolling manner, and lifting right and left grounding bodies on right and left portions of the working device. A right transmission mechanism, which is freely provided, mechanically extracts and transmits the raising and lowering operation of the right grounding body to the working device, and mechanically extracts and transmits the raising and lowering operation of the left grounding body to the working device. And an averaging mechanism for mechanically averaging the elevating operation transmitted from the right transmission mechanism and the elevating operation transmitted from the left transmission mechanism, and the right transmission mechanism. Inclination detecting means for electrically detecting a difference between the transmitted lifting operation and the lifting operation transmitted from the left transmission mechanism, and the control valve is controlled by the lifting operation averaged by the averaging mechanism. The hydraulic actuator is supplied to the elevating cylinder from the control valve so that the working device is driven up and down by the elevating cylinder, and based on a detection value of the inclination detecting means, The working device driving structure of the working vehicle, wherein the working device is configured to be driven by rolling. 2. The right and left transmission mechanisms are constituted by wires, and the averaging mechanism is constituted by a moving pulley whose rotation axis moves while rotating, and the wire is wound around the moving pulley, The working device drive structure for a work vehicle according to claim 1, wherein the moving operation of the rotating shaft of the moving pulley is transmitted to the control valve. 3. The working device drive structure for a working vehicle according to claim 1, wherein the averaging mechanism, the control valve, and the inclination detecting means are provided in the body.