JP3408968B2 - Automatic raising and lowering control structure of rice transplanter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a seedling planting device to a rear part of a traveling machine body through an elevating link mechanism which is elevated and lowered by the operation of a hydraulic cylinder, and a ground leveling float is attached to the seedling planting device. A swing arm that swings up and down around a rear fulcrum and swings in conjunction with the vertical swing of the ground leveling float and a control valve that controls the operation of the swing arm and the hydraulic cylinder are linked. And a connecting wire for controlling the operation of the hydraulic cylinder based on the vertical swing of the ground leveling float around the rear fulcrum, thereby raising and lowering control for maintaining the ground level of the seedling planting device within a set range. The present invention relates to an automatic lifting control structure of a rice transplanter that constitutes a mechanism.

[0002]

2. Description of the Related Art Conventionally, in the automatic raising / lowering control structure of a rice transplanter as described above, the end portion of the outer wire of the connecting wire on the side of the swing arm is located at a point on the movement locus of the connection point with the swing arm of the inner wire. It was fixed to the fixing part of the seedling planting device via the outer holder in the state in which it was directed.

[0003]

By the way, the automatic raising / lowering control for maintaining the ground height of the seedling planting device within the set range based on the vertical swing around the rear fulcrum of the leveling float is performed by the grounding of the seedling planting device. The height was higher than the set range and the seedlings fell due to shallow planting, and the height of the seedling planting device to the ground was lower than the set range and the mud pushing by the leveling float became stronger. This is for enabling suitable planting in which the occurrence of seedling collapse is prevented.

However, in the above-mentioned conventional technique, the end portion of the outer wire on the swing arm side is fixed in a state of being directed to a point on the movement locus of the connection point of the inner wire with the swing arm. As the connecting point of the inner wire deviates from one point, the twist of the inner wire with respect to the end portion of the outer wire on the swing arm side increases, and the sliding contact resistance between the end portion of the outer wire on the swing arm side and the inner wire increases. Like this,
As a result, the durability of the linking wire is reduced, or the operation of the control valve via the linking wire becomes less smooth, and the seedling planting device based on vertical swinging around the rear fulcrum of the leveling float is Delays in raising and lowering operations tend to cause delays in planting and preventing the seedlings from falling due to the strong mud pushing of the ground leveling float.

By the way, an outer support member for receiving and supporting an end portion of the outer wire on the side of the swing arm is provided rotatably in the displacement direction of the connecting point of the inner wire, and the outer support and the swing arm move together with the swing arm. It is conceivable that the direction of the swing arm side end of the outer wire may be changed to the direction of the inner wire connecting point by the action of the inner wire displacing the connecting point. The connecting point of the swinging arm is displaced, and the direction of the end portion of the outer wire on the swinging arm side is changed in association with the pushing / pulling operation of the inner wire so that the connecting point of the displacing inner wire follows. .
That is, in this configuration, since the inner wire is twisted with respect to the end portion of the outer wire on the swing arm side caused by the swing of the swing arm, the orientation of the end portion of the outer wire on the swing arm side is changed.
It is not possible to avoid an increase in sliding contact resistance between the inner wire and the swing arm side end of the outer wire due to the twist, and thus the durability of the linking wire is reduced, or the linking wire is The operation of the control valve through the operation becomes less smooth, and the raising / lowering operation of the seedling planting device based on the vertical swing around the rear fulcrum of the ground leveling float is likely to be delayed, resulting in strong shallow planting and strong ground leveling float. This causes the inconvenience that it becomes difficult to prevent the occurrence of seedling collapse due to mud pushing.

An object of the present invention is to improve the durability of the linking wire in the lifting control mechanism for maintaining the ground height of the seedling planting device within the set range based on the vertical swinging around the rear fulcrum of the leveling float. It is intended to enable stable and suitable planting while preventing the occurrence of seedling collapse due to shallow planting or strong mud pushing of ground leveling floats.

[0007]

In order to achieve the above object, in the invention according to claim 1 of the present invention, seedlings are planted in the rear part of the traveling machine body through an elevating link mechanism which is moved up and down by the operation of a hydraulic cylinder. And a rocking arm that rocks in conjunction with the vertical swing of the ground leveling float, while equipping the grounding float with a ground leveling float around the rear fulcrum in the seedling planting device. By controlling the operation of the hydraulic cylinder based on the vertical swing around the rear fulcrum of the ground leveling float from a linking wire that links the swing arm and a control valve that controls the operation of the hydraulic cylinder, In the automatic raising / lowering control structure of a rice transplanter, which comprises a raising / lowering control mechanism for maintaining a height above ground of the seedling planting device within a set range, an intermediate portion of the swing arm is provided on the side of the seedling planting device
The bracket is supported so that it can swing up and down around the fulcrum.
And the end of the swing arm is attached to the end of the linking wire.
The outer wire end of the linking wire.
Part of the outer wire from the end in the extension direction of the outer wire.
Connect the Uta bracket and connect the base to the bracket.
The outer wire is swingably supported, and the direction of the end portion of the outer wire on the swing arm side is oriented in the direction of the connecting point of the inner wire that is displaced with the swing of the swing arm. Configured to force change.

[Operation] According to the first aspect of the invention, the outer wire of the linking wire is formed.
Insert the wire end from the end in the extension direction of the outer wire.
Connect the Uta support and connect the base to the bracket on the seedling planting equipment side.
The outer wire is swingably supported around the connecting point, and the end of the outer wire on the side of the swing arm moves in the direction of the connecting point of the inner wire and the swing arm in conjunction with the swing of the swing arm. Therefore, the direction of the end of the outer wire on the swing arm side is changed at the same time as the displacement of the connection point of the inner wire with the swing arm accompanying the swing of the swing arm. Inner wire swing along
It can be changed in the direction of the connection point with the moving arm , which allows the inner wire to swing as the swing arm swings.
It is possible to prevent the inner wire from being twisted with respect to the swing arm side end portion of the outer wire when the connecting point with the moving arm is displaced. In other words, regardless of the displacement of the connecting point of the inner wire, it is possible to avoid an increase in the sliding contact resistance due to the twisting between the end of the outer wire on the swing arm side and the inner wire. It will be possible to improve the sex. In addition, since it is possible to avoid an increase in the sliding contact resistance between the end portion of the outer wire on the swing arm side and the inner wire, it is possible to smoothly operate the control valve via the linking wire, so that the rear fulcrum around the leveling float is supported. It is possible to prevent delays in raising and lowering operations of the seedling planting device based on vertical swing in the plant, and thus to prevent planting of seedlings due to shallow planting and strong mud pushing of the leveling float, and suitable planting. You will be able to do it stably.

[Effect] Therefore, it is possible to improve the durability of the linking wire in the lifting control mechanism that maintains the ground height of the seedling planting device within the set range based on the vertical swing around the rear fulcrum of the leveling float. Furthermore, it has become possible to stably perform suitable planting in which seedling collapse due to shallow planting and strong mud pushing of leveled float is prevented.

In the invention according to claim 2 of the present invention,
In the invention according to claim 1, the outer support on the side of the swing arm extends toward a connection point of the inner wire with the swing arm, and the extending portion has an inner wire swing arm.
With a linear guide for guiding along the connecting point in the extending direction of the outer bracket as well as engaging the point of attachment to.

[Operation] According to the second aspect of the invention, the outer receiver is provided with the outer wire and the swing arm side end of the outer wire, and the swing arm in association with the swing of the swing arm. Compared to the case where a dedicated interlocking member is provided, it is also used as the interlocking member that interlocks and connects the inner wire to the direction of the connection point of the inner wire with the swinging arm. As a result, the configuration can be simplified and the manufacturing cost can be reduced.

[Effect] Therefore, while the simplification of the structure and the reduction of the manufacturing cost are achieved, the durability of the linking wire in the lifting control mechanism can be improved, and the shallow mud and the strong mud pushing of the leveling float cause It has become possible to stably carry out suitable planting in which the occurrence of falling seedlings is prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire side surface of the rice transplanter. This rice transplanter has a lifting link mechanism 3 that moves up and down by the operation of a hydraulic cylinder 2 at the rear of a traveling machine body 1 configured as a riding type. The seedling planting device 4 is vertically movable to form a riding type. The traveling machine body 1 includes an engine 5 mounted on a front portion, a belt type transmission device 6 to which power from the engine 5 is transmitted, and a gear type transmission device 7 to which power after shifting via the belt type transmission device 6 is transmitted. A pair of left and right front and rear wheels 8 and 9 to which power after gear shifting via the gear type transmission 7 is transmitted, a steering wheel 10 for steering operation, and a driver's seat 11 arranged behind the steering wheel 10. , And so on.
The seedling planting device 4 includes a feed case 12 having a drive mechanism (not shown) for transmitting the power after shifting via the gear type transmission device 7, and a transmission mechanism (not shown) transmission-coupled to the drive mechanism. ) Is installed inside, a rotary type planting mechanism 14 axially supported on the rear left and right sides of each planting transmission case 13 so as to be driven by power via the transmission mechanism, and each planting It is composed of a seedling table 15 that reciprocates left and right with a constant stroke with respect to the mechanism 14, and a plurality of leveling floats 16 that perform a leveling action in advance on the planting site by each planting mechanism 14.

As shown in FIGS. 1 to 3 and 5, at the front lower portion of each planted transmission case 13, there is provided a rotary shaft 17 which extends laterally across each planted transmission case 13. It is supported so as to be rotatable around it. A plurality of support arms 18 are extended rearward from the rotary shaft 17, and the rear end of the corresponding leveling float 16 can swing up and down around a fulcrum (rear fulcrum) P2 at the free end of each support arm 18. Supported by. Further, an operation lever 19 is extended from the rotary shaft 17 toward the front. The operation lever 19 is swingably guided by a guide hole 21A formed in a plate-shaped frame 21 standing upright from the lateral support frame 20 to which the front ends of the planted transmission cases 13 are connected to each other and the feed case 12. At the same time, it can be fixed at a desired swing position by engaging with any one of the locking grooves 21a provided in the guide hole 21A. From this configuration, the operation lever 19
By changing the fixed position of the plant, the planting mechanism 1
The height position of the leveling float 16 with respect to 4 can be changed so that the seedling planting depth by the planting mechanism 14 can be adjusted to a desired planting depth.

The plate-shaped frame 21 includes a swing link 22 supported by two upper and lower support pins 21B extending forward from the front surface thereof so as to be swingable up and down, and a play of each swing link 22. A parallel four-link mechanism is formed from the bracket 23 supported at the end. Upper swing link 22
The engaging recess 22a is formed at the outer end on the swing fulcrum side, and the linking pin 19a extended from the operating lever 19 for adjusting the planting depth is engaged with the engaging recess 22a. It has become. From this configuration, the bracket 2
3, the height position of the leveling float 16 is changed in the same manner as the leveling float 16 with the operation of changing the height position of the leveling float 16 by the operation lever 19.
The height position of the bracket 23 with respect to the rear fulcrum P2 of 6 can always be kept constant.

A balance-type swing arm 24 is supported on the bracket 23 so as to be vertically swingable around a fulcrum P3.
An interlocking mechanism 25 is installed from the front part of the leveling float 16 located in the center of the left and right to the rear end of the swing arm 24. The swing arm 24 moves up and down around the rear fulcrum P2 of the leveling float 16 in the center. It is adapted to swing up and down around the fulcrum P3 in conjunction with the swing. The leveling float 1 in the center from the upper end of the bracket 23 to the rear end of the swing arm 24
An urging mechanism 26 that urges 6 to swing downward is installed.
The front end of the swing arm 24 is linked to a control valve 27 that controls the operation of the hydraulic cylinder 2 via a linking wire 28, and as it descends, the control valve 27 moves upward to supply hydraulic oil to the hydraulic cylinder 2. It is designed to be operated on the position side. The linking wire 28 is supported by the bracket 23 via an outer receiver 29 at an end of the outer wire 28A on the swing arm 24 side. Although illustration is omitted, the control valve 27 has a rising position for supplying hydraulic oil to the hydraulic cylinder 2,
It is a three-position switching type having a neutral position for stopping the supply and discharge of hydraulic oil to and from the hydraulic cylinder 2 and a descending position for discharging the hydraulic oil from the hydraulic cylinder 2, in that order, and is operated to the descending position side by an urging mechanism. The operation lever 30 is biased and is linked to the operation lever 30 so as to be forcibly operated to the raised position side by the operation lever 30 (see FIG. 1) arranged on the right side of the driver's seat 11. The operating lever 30 is also linked to a planting clutch that switches the transmission state to the seedling planting device 4.

With the above construction, when the operating lever 30 is operated to the raised position, the control valve 27 is switched to the raised position by the action of the operating lever 30 against the operation bias of the biasing mechanism, whereby the seedling planting device. 4 can be raised toward a predetermined upper limit position, and when the operation lever 30 is moved to the lowered position two steps forward from the raised position, the control valve 27 is switched to the lowered position by the action of the biasing mechanism. The seedling planting device 4 can be lowered toward a predetermined planting height position, and when the operation lever 30 is operated to the neutral position between the raised position and the lowered position, the action of the operation lever 30 or the action of the biasing mechanism. Thus, the control valve 27 is switched to the neutral position, so that the seedling planting device 4 can be stopped from moving up and down at a desired height position. The seedling planting device 4 in which the operating lever 30 is operated to the lowered position
In the lowering operation, when the central grounding float 16 comes into contact with the ground and ascends and swings up around the rear fulcrum P2, the inner wire 28B of the linkage wire 28 is pulled by the swinging movement of the swinging arm 24, which is controlled. When the valve 27 is operated from the lowered position to the raised position side and the central grounding float 16 is raised to a predetermined reference posture range, the operation lever 30 is in the lowered position,
The control valve 27 is switched to the neutral position, and the descending of the seedling planting device 4 is automatically stopped at a predetermined planting height position. On the other hand, in the raising operation of the seedling planting device 4 in which the operation lever 30 is operated to the raised position, when the seedling planting device 4 reaches the upper limit position, the lifting link mechanism 3 and the control valve 27.
By the action of a link rod (not shown) that links the and, the operating lever 30 is operated from the raised position to the neutral position, and accordingly, the control valve 27 is switched to the neutral position by the action of the biasing mechanism. The raising of the seedling planting device 4 is automatically stopped at the upper limit position. When the operating lever 30 is operated to the planting position one step further forward than the lowered position, the engaged state of the planting clutch is revealed, and the seedling planting device 4 performs the planting operation at a predetermined planting height position. When the operation lever 30 is operated backward from the planting position, the disengaged state of the planting clutch is revealed and the planting operation of the seedling planting device 4 is stopped.

In a state where the operating lever 30 is operated to the lowered position or the planting position, for example, the traveling machine body 1 reaches a deep part of the cultivator, or the traveling machine body 1 is in a rearward inclined posture and the seedling planting device 4 is placed. The ground leveling float 16 in the center is
When the upward ground load acting on the center of the ground level float 16 becomes larger than the reference value and the center ground float 16 moves upward from the predetermined reference posture range, the inner wire 28B of the linking wire 28 is pulled by the swinging of the swing arm 24 in conjunction with it. When the control valve 27 is operated to switch from the neutral position to the raised position, the seedling planting device 4 is operated to be raised and prevented from sinking from the predetermined planting height position. When the leveling float 16 at the center is lowered to a predetermined reference posture range by the raising operation, the inner wire 28B of the linking wire 28 is rocked by the rocking of the rocking arm 24 in conjunction therewith.
And the control valve 27 is switched from the raised position to the neutral position by the action of the biasing mechanism, whereby the raising of the seedling planting device 4 is automatically stopped within the range of the predetermined planting height position. ing. On the other hand, in a state where the operation lever 30 is operated to the lowered position or the planting position, for example, the traveling machine body 1 reaches a shallow part of the cultivator, or the traveling machine body 1 is in a front-lowering inclined posture, and the seedling planting device 4 is operated. When the ground leveling float 16 at the center deviates downward from the predetermined reference posture range due to the upward grounding load acting on the leveling float 16 at the center becoming smaller than the reference value due to rising from the predetermined planting height position, The inner wire 2 of the linking wire 28 is generated by the swinging motion of the swinging arm 24.
8B is loosened, and the control valve 27 is switched from the neutral position to the lowered position by the action of the urging mechanism, whereby the seedling planting device 4 is operated to be lowered and the floating from the predetermined planting height position is prevented. Like When the central leveling float 16 is raised to a predetermined reference posture range by the lowering operation, the inner wire 28B of the linking wire 28 is pulled by the swinging of the swinging arm 24 that is interlocked therewith, and the control valve 27 is moved from the lowered position to the neutral position. By switching to, the descending of the seedling planting device 4 is automatically stopped within the range of a predetermined planting height position.

That is, the swing arm 24 swinging in conjunction with the vertical swing of the leveling float 16 in the center, and the swing arm 2
4 and the control wire 27 that controls the operation of the hydraulic cylinder 2 and the connecting wire 28 that controls the operation of the hydraulic cylinder 2 based on the vertical swing around the rear fulcrum P2 of the leveling float 16, An elevating control mechanism A for performing automatic elevating control for maintaining the ground height of the planting device 4 within a set range (within a range of a predetermined planting height position) is configured. Seedling planting device 4
The ground height of the seedlings becomes higher than the set range (predetermined planting height position) and shallow planting occurs, and the ground height of the seedling planting device 4 becomes lower than the set range and the ground is leveled. It is possible to perform suitable planting while preventing the occurrence of seedling collapse due to the strong mud pushing by the float 16.

Further, the outer wire 28A of the linking wire 28
Since the end of the rocking arm 24 side of the bracket 23 is supported by the bracket 23 whose height position with respect to the rear fulcrum P2 of the leveling float 16 is always maintained constant, regardless of the planting depth adjustment by the operation lever 19. The suitable planting as described above can be performed.

As shown in FIGS. 2 to 5, the outer holder 29
Is connected by the connecting pin 32 and the base portion to the displacement direction of the connecting pin 31 is connected point Po between the inner wire 28B swing arm 24 of which is displaced with the swinging of the swing arm 24
The bracket 23 is supported so as to be swingable around the point P4 , and one end side thereof is extended toward the connecting pin 31, and the extending portion 29A engages with the connecting pin 31 and is connected to the connecting pin 31. A long hole 29a is formed as a linear guide portion a that guides 31 along the extending direction of the outer holder 29. In other words, the outer receiver 29 on the swing arm 24 side moves in the direction of the end portion of the outer wire 28A of the linkage wire 28 on the swing arm 24 side in conjunction with the swing of the swing arm 24 around the fulcrum P3. The inner wire 28B, which is displaced along with the swing of the moving arm 24, is forcibly changed in the direction of the connection point Po (connecting pin 31) with the swing arm 24. At the same time as the displacement of the connection point Po accompanying the swing, the outer wire 28
The direction of the end on the swing arm 24 side in A is the outer wire.
The outer that swings around the connection point P4 near the end of the ear 28A.
It can be changed to the direction of the connection point Po via the receiving member 29, and when the connection point Po is displaced along with the swing of the swing arm 24, the outer wire 28A has a swing arm 24 side end portion. On the other hand, the inner wire 28B can be prevented from being twisted, whereby the swinging arm 2 of the outer wire 28A can be irrespective of the displacement of the connecting point Po of the inner wire 28B.
It is possible to avoid an increase in the sliding contact resistance due to the twisting between the end portion on the fourth side and the inner wire 28B, and thus it is possible to improve the durability of the linking wire 28. In addition, the swing arm 24 of the outer wire 28A
Since the increase of the sliding contact resistance between the end portion on the side and the inner wire 28B can be avoided, the control valve 27 can be smoothly operated via the linking wire 28, and therefore, the rear fulcrum P2 around the leveling float 16 can be operated. It is possible to prevent a delay in the raising and lowering operation of the seedling planting device 4 based on the vertical swing, and thus to prevent the occurrence of seedling collapse due to shallow planting and strong mud pushing of the leveling float 16 and suitable planting. It can be done stably.

[Brief description of drawings]

[Figure 1] Overall side view of rice transplanter

FIG. 2 is a plan view of a main part showing a configuration of a lifting control mechanism.

FIG. 3 is a side view of a main part showing a configuration of a lifting control mechanism and an outer support on the side of a swing arm.

FIG. 4 is a vertical sectional front view and a side view of a main part showing a configuration of an outer support on the swing arm side.

FIG. 5 is a perspective view of a main part showing a configuration of a lifting control mechanism and an outer holder on the side of a swing arm.

[Explanation of symbols]

1 traveling aircraft 2 hydraulic cylinder 3 Lifting link mechanism 4 Seedling planting equipment 16 leveling float 24 swing arm 27 Control valve 28 Coupling wire 28A outer wire 28B Inner wire 29 Outer bracket 29A extension part a Straight guide A lift control mechanism P2 rear fulcrum Po connection point

Continuation of the front page (56) Reference JP-A-4-335813 (JP, A) JP-A-8-196117 (JP, A) JP-A-4-158708 (JP, A) JP-A-61-25409 (JP , A) JP-A-9-107742 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A01C 11/02 A01B 63/10

Claims (2)

(57) [Claims] 1. A seedling planting device is movably connected to the rear part of the traveling machine body through an elevating link mechanism that is raised and lowered by the operation of a hydraulic cylinder, and a leveling float is oscillated up and down around the rear fulcrum in the seedling planting device. A swing arm that is movably equipped and that swings in conjunction with the vertical swing of the leveling float,
By controlling the operation of the hydraulic cylinder based on the vertical swing around the rear fulcrum of the ground leveling float from a linking wire that links the swing arm and a control valve that controls the operation of the hydraulic cylinder, An automatic raising / lowering control structure of a rice transplanter comprising a raising / lowering control mechanism for maintaining a height above ground of the seedling planting device within a set range, wherein a middle part of the swing arm is a bracket on the side of the seedling planting device. To
On the other hand, while supporting vertically swingable around a fulcrum,
Connect the inner wire of the linking wire to the end of the swing arm.
Binding, and Au from its ends to the outer wire ends of the linking wire
Extend in the extension direction of the outer wire to connect the outer bracket,
Supports the base part of the bracket so that it can swing around the connection point
Then, the direction of the end portion of the outer wire on the swing arm side is forcibly changed to the direction of the connection point of the inner wire that is displaced with the swing of the swing arm and the swing arm. Automatic lifting control structure of rice transplanter. Wherein the swing arm side of the outer bracket as, in
Extending towards the connection point of the nawire with the swing arm ,
Claim 1 that is provided with a linear guide for the connecting point is guided along the extending direction of the outer bracket as well as engage the connecting point between the swing arm of the inner wire to the extending portion
Automatic lifting control structure for the rice transplanter described.