JP3405940B2 - Riding rice transplanter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for raising and lowering a seedling planting device in a riding type rice transplanter.

[0002]

2. Description of the Related Art In a riding type rice transplanter, a grounding float is arranged in the lower part of the center of the seedling planting device, and the grounding float is supported by the seedling planting device so as to be vertically swingable around a rear horizontal axis. ,
2. Description of the Related Art There are some which are equipped with an elevation detecting member for detecting the elevation of the grounding float with respect to the seedling planting device, in the front part of the grounding float.
As a result, when the seedling planting device moves up and down with respect to the grounding float that follows the ground on the paddy field, the grounding float moves up and down relative to the seedling planting device. The seedling planting device is automatically driven up and down so that the upper and lower positions of the grounding float with respect to the seedling planting device are detected by the detection member. Therefore, the seedling planting device is maintained at the set height from the rice field, and the seedling planting depth of the seedling planting device is maintained at the set depth.

[0003]

The above-mentioned elevation detecting member moves up and down with respect to the seedling planting device to detect the elevation of the ground float with respect to the seedling planting device. Since it is not possible to accurately detect the rise and fall of the ground float with respect to the planting device, it is necessary to appropriately protect the lift detection member. SUMMARY OF THE INVENTION It is an object of the present invention to configure a riding type rice transplanter such that an elevation detecting member for detecting elevation of a grounding float with respect to a seedling planting apparatus can be appropriately protected while utilizing an existing structure.

[0004]

A feature of the present invention is that the riding type rice transplanter is constructed as follows. [1] A grounding float is arranged in the lower part of the center of the seedling planting device, and the grounding float is supported on the seedling planting device so as to be vertically swingable around the horizontal axis of the rear part, and is located above the grounding float. In the fixed part of the seedling planting device ,
Place the lever guide of the planting depth adjustment lever, and
On the left and right sides of the funnel, above the lateral side
If it is configured so that the holding part of the adjustment lever in
Along with this, an elevation detection member that detects the elevation of the grounding float with respect to the seedling planting device is installed in front of the fixed part at the front of the grounding float.
Side and the holding part of the adjustment lever in the lever guide.
Is located on the other side of the grounding float and is based on the posture change of the grounding float due to the change of the planting depth by the adjusting lever.
Float that corrects the effect on raising and lowering control of seedling planting equipment
Posture adjustment mechanism on the front side of the fixed part and on the lever guide
On the left and right of the ground float rather than the holding part of the adjusting lever
It is located on one side .

[2] In the structure of [1] above, the lever guide is supported by the fixed portion.

[3] In the structure of [1] or [2] above, the lift detecting member is provided in the front part of the grounding float by being displaced from the center of the grounding float to the lever guide side.

[0007]

[I] According to the feature of claim 1, in the riding-type rice transplanter, the grounding float is arranged in the lower part of the center of the seedling planting device, and the grounding float is vertically swingable about the horizontal axis of the rear part. In the case where the front part of the grounding float is equipped with a lift detecting member that supports the seedling planting device and detects whether the grounding float moves up and down with respect to the seedling planting device, it is located above the ground float behind the lift detecting member. The fixed part of the seedling planting device is located on the left side of the lift detection member.
The lever guide of the seedling planting depth adjusting lever is located on the right side . Thereby, according to the feature of claim 1,
By the fixed portion and the lever guide, the rear side and one of the left and right sides of the lift detecting member are protected.

According to the feature of claim 1, the float posture adjustment
It has a section mechanism, change of planting depth due to the adjustment lever
Of seedling planting equipment based on the change of posture of the ground float due to
The influence on the descending control is corrected by the float attitude adjustment mechanism.
Has been. In this case, according to the features of claim 1, the elevator inspection
A fixed part on the rear side of the float posture adjustment mechanism as with the projecting member
Is located on the right and left sides of the float posture adjustment mechanism.
The guide is located, and the fixed part and lever guide
Therefore, the rear side and one of the left and right sides of the float
It will be protected.

In the riding type rice transplanter, since the adjusting lever and the lever guide of the seedling planting depth and the fixed portion of the seedling planting device located above the grounding float have an existing structure,
According to the feature of claim 1, the fixed part and the lever guide, which are the existing structures, are also used as a member that protects the lift detection member and the float posture adjusting mechanism .

[II] According to the features of claim 2, as in the case of claim 1, the "action" described in the above [I] is provided, and in addition to this, the following "action" is provided. ing. According to the feature of claim 2, since the lever guide is supported by the fixed portion and the fixed portion and the lever guide are connected, it is said that there is nothing between the fixed portion and the lever guide. This is not the state, but the state in which there is an object between the fixed portion and the lever guide (the state in which there is a support member or the like for supporting the lever guide on the fixed portion). As a result, according to the feature of claim 2, the lifting detection member and the float posture adjustment are caused by the object existing between the fixed portion and the lever guide.
The knot mechanism is protected.

[III] According to the feature of claim 3, as in the case of claim 1 or 2, the "action" described in the above [I] and [II] is provided,
In addition to this, it has the following “action”. According to the feature of claim 3, since the lift detecting member is provided in the front part of the ground float by displacing the lift detecting member from the left-right center of the ground float to the lever guide side, the lift detecting member approaches the lever guide. There is. As a result, one of the left and right sides of the lift detecting member is more well protected by the lever guide.

[0012]

According to the features of claim 1, in the riding type rice transplanter, when the raising / lowering detecting member for detecting the raising / lowering of the grounding float with respect to the seedling planting device is provided in the front portion of the grounding float, it is located above the grounding float. The fixed part of the seedling planting device located and the lever guide of the seedling planting depth adjustment lever can protect the rear side and one of the left and right sides of the lift detection member, and the lift detection member contacts other objects. It is possible to reduce the possibility of damage and deformation of the seedling planting equipment.
It was possible to avoid the occurrence of a situation in which it was not possible to accurately detect the rise and fall of the grounding float by the lift detecting member .

According to the features of claim 1, the adjusting lever
Based on the change in posture of the grounding float due to the change of planting depth
Float figure that corrects the effect on raising and lowering control of seedling planting equipment
When equipped with a force adjustment mechanism, the flow is the same as for the lift detection member.
To protect the rear side and one side of the left and right
Yes, the float posture adjustment mechanism came into contact with other objects and was damaged
Float can reduce the possibility of deformation
The influence of the posture adjustment mechanism on the lifting control of the seedling planting device is corrected.
Corrective action is difficult to perform properly and
Highly accurate up / down detection of ground float float
Avoiding the situation that you can not do
I was able to.

According to the features of claim 1, it is an existing structure.
That the fixed portion and the lever guide, lift detecting member and furo
Since it is also used as a member that protects the seat attitude adjustment mechanism , it causes an increase in the weight of the airframe and a complicated structure, which is a disadvantageous condition for a riding-type rice transplanter as compared with the case where a dedicated protection member is provided. Therefore, a structure having a protective function can be obtained, which is also advantageous in terms of weight reduction and simplification of the structure.

According to the feature of claim 2, as in the case of claim 1, the "effect of the invention" of the above-mentioned claim 1 is provided. In addition to the "effect of the invention", the following "invention" is provided. It has the effect of. According to the feature of claim 2, a state in which the lever guide is supported by the fixed portion and an object is present between the fixed portion and the lever guide (a state in which a support member for supporting the lever guide by the fixed portion is present). it has, by one that exists between the fixed part and the lever guide also because the lift detection member and the float attitude adjustment mechanism is in a state to be protected, the lift detection member and the float
It was possible to further reduce the damage and deformation of the attitude adjustment mechanism .

According to the features of claim 3, claim 1 or 2
Similar to the above case, the “effect of the invention” of the above-mentioned claim 1 or 2
In addition to the "effect of the invention", the following "effect of the invention" is provided. According to the feature of claim 3, by disposing the lift detection member in the front part of the ground float by displacing the lift detection member from the left-right center of the ground float to the lever guide side, the lift detection member approaches the lever guide. Since one of the left and right sides of the lift detection member is better protected by the lever guide, damage and deformation of the lift detection member can be further reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. [1] As shown in FIG. 1, the seedling planting device 3 is connected to the rear portion of the machine body supported by the front wheels 1 and the rear wheels 2 by a link mechanism 4 and a single-acting hydraulic cylinder 5 so as to be vertically driven. A passenger type rice transplanter is constructed. As shown in FIG. 1, in the seedling planting device 3, a planting case 8 having a pair of planting arms 7 is rotatably supported by a rear part of the planting mission case 6 of the seedling planting device 3, The seedling stand 9 is supported by the planting mission case 6 so as to be freely reciprocated laterally and laterally, and a pair of planting arms 7 alternately take out the seedlings from the seedling placing stand 9 as the planting case 8 rotates. It is configured to be planted on the rice field G.

As shown in FIGS. 2 and 1, the seedling planting device 3
One ground float 16 is arranged in the center of the left and right of the ground float 16, and the ground float 16 has a planted mission case 6 at the rear.
The support arm 17 is swingably supported around the horizontal axis P1. As shown in FIGS. 2 and 3, a balance-shaped first arm 26 and a second arm 27 are supported by a frame 18 fixed to the front end of the planted mission case 6 so as to be vertically swingable, and A bracket 28 having an L-shape in plan view is supported by the tips of the two arms 26, 27, and the bracket 28 is supported by the first and second arms 26, 27 so that the bracket 28 can move up and down in parallel.

As shown in FIGS. 2 and 3, the bracket 2
8, a potentiometer 19 is fixed, and a detection arm 19a of the potentiometer 19 and a front portion of the ground float 16 are connected by a rod 20. The rod 23 supported on the front part of the ground float 16 is attached to the bracket 2
A bracket 24 fixed to 8 is vertically movably inserted, and a spring 21 for urging the ground float 16 downward is provided between the rod 23 and the bracket 24.

As shown in FIGS. 2 and 3, the support arm 1
A planting depth adjusting lever 29 is fixed to the base of 7. As a result, by operating the adjusting lever 29 up and down to engage and fix the lever guide 30, the vertical angle of the support arm 17, that is, the horizontal axis P1 and the ground float 1.
By changing the position of 6 up and down, the planting depth of seedlings is changed as described later.

As shown in FIG. 3, the other end of the first arm 26 is engaged with the pin 29a of the adjusting lever 29, and the adjusting lever 29 is operated up and down to position the horizontal axis P1 and the ground float 16. Even if the planting depth of the seedling is changed by changing up and down, the first arm 26 and the bracket 28 are vertically swung along with this, and the grounding is performed regardless of the change of the planting depth of the seedling. Float 16, potentiometer 19 and rod 2
Upper and lower intervals such as 3 are configured to be maintained at the intervals shown in FIG. The pin 29a, the first arm 26, and the second arm 27 constitute a float posture adjusting mechanism.

As shown in FIGS. 2 and 3, the lever guide
30 is supported by the frame 18, and the front side of the frame 18
Located on the right and left sides of the ground float 16
The adjustment lever 29 in the lever guide 30 is provided above the portion.
The holding part of is located. The rod 20 of the frame 18
On the front side, the lever guide 30 holds the adjustment lever 29.
Located on the other side of the ground float 16 than the holding part
There is. The rod 20 moves from the center of the ground float 16 to the left and right.
The front part of the grounding float 16 is offset to the side of the bar guide 30.
Is equipped with. Pin 29a, first and second arms 2
6 and 27 are on the front side of the frame 18 and are attached to the lever guide 30.
Ground float 16 rather than the holding part of the adjusting lever 29 in
Are arranged on the other side of the left and right.

[2] Next, the elevation control of the seedling planting device 3 in the riding type rice transplanter will be described. As shown in FIG. 4, the detection value of the potentiometer 19 is input to the control device 10, and the sensitivity setting switch 1 capable of artificially changing the control sensitivity of the elevation control.
1 is provided. Lifting position 1 for supplying hydraulic oil of the pump 13 to the hydraulic cylinder 5 to operate the seedling planting device 3
2U, a lowering position 12D for draining hydraulic oil from the hydraulic cylinder 5 and lowering the seedling planting device 3, and a neutral position 12N
The three-position switching type electromagnetically operated control valve 12 is provided,
Between the control valve 12 and the hydraulic cylinder 5, the hydraulic cylinder 5
An electromagnetically operated on-off valve 14 is provided at an open position 14a for supplying / discharging hydraulic oil and a closed position 14b for shutting off the supply / discharging of hydraulic oil so that switching operation can be performed at high speed.

As shown in FIG. 5, the on-off valve 14 has an open position 1
The operation time for 4a is fixed to the minute time T1, and the open position 14a and the closed position 14b are switched at high speed in a cycle T (see state A in FIG. 5). As a result, the supply / discharge amount of hydraulic oil from the pump 13 and the control valve 12 to the hydraulic cylinder 5 is set to a relatively small flow rate corresponding to the state A in FIG. 5 in a normal state.

With the above structure, it is assumed that the sensitivity setting switch 11 is set to the standard as shown in FIG. In this state, when the grounding float 16 follows the paddy field G along with the traveling with planting, the detection value of the potentiometer 19 becomes the reference value C1 based on the detection value of the potentiometer 19 as shown in FIG. (So that the detection arm 19a of the potentiometer 19 is in the posture of the reference value C1 in FIG. 2), the control device 10 moves the control valve 12 to the raised position 12U.
And the lowering position 12D, the hydraulic cylinder 5 is expanded and contracted, and the seedling planting device 3 is automatically driven up and down. As a result, the seedling planting device 3 is automatically maintained at the set height from the paddy field G, and the seedling planting depth is maintained at the set value. In this case, since the supply / discharge amount of the hydraulic oil to / from the hydraulic cylinder 5 is set to a relatively small flow rate corresponding to the state A in FIG. 5 by the switching operation of the opening / closing valve 14, the expansion / contraction of the hydraulic cylinder 5 is started. It is relatively slow, and the expansion / contraction speed of the hydraulic cylinder 5 is also relatively low.

In the above-mentioned state, the potentiometer 1
It is assumed that the detected value of 9 largely deviates from the reference value C1 by more than the set range. In this case, the control valve 12 is moved to the raised position 12U so that the detected value of the potentiometer 19 becomes the reference value C1.
The period T is shorter than the state A when the switching time is set to the open position 14a as shown in the state B of FIG. Set to one.

When the open / close valve 14 is switched in the cycle T shorter than the state A, the amount of hydraulic oil supplied to and discharged from the hydraulic cylinder 5 is larger than the flow rate corresponding to the state A in FIG. Set to flow rate. As a result, the hydraulic cylinder 5 starts expanding and contracting relatively quickly, and the expanding and contracting speed of the hydraulic cylinder 5 also becomes relatively high, so that the seedling planting device 3 is quickly and smoothly returned to the set height.

[3] In the elevation control of the seedling planting device 3 as described above, the rice field G
When there are many irregularities, the sensitivity setting switch 11 is operated to the insensitive side. In this case, as shown in FIG. 2, the initial reference value C
1 is changed to the reference value C2 corresponding to the operation position of the sensitivity setting switch 11. In such a state, the seedling planting device 3 is automatically operated so that the detection value of the potentiometer 19 becomes the reference value C2 (so that the detection arm 19a of the potentiometer 19 has the posture of the reference value C2 in FIG. 2). Is driven up and down. Since the attitude of the ground contact float 16 at the reference value C2 is higher than the attitude shown in FIG. 2, the contact area of the ground contact float 16 with the rice field G is reduced, and the spring 21 is compressed and the biasing force of the spring 21 is strengthened. . Therefore, in this state, the ground follow-up sensitivity of the ground float 16 to the rice field G, that is, the control sensitivity of the elevation control is changed to the insensitive side.

On the contrary, when the unevenness of the surface G is small, the sensitivity setting switch 11 is operated to the sensitive side. In this case,
As shown in, the initial reference value C1 is the sensitivity setting switch 1
It is changed to the reference value C3 corresponding to the operation position of 1. In such a state, the seedling planting device 3 is automatically operated so that the detection value of the potentiometer 19 becomes the reference value C3 (so that the detection arm 19a of the potentiometer 19 has the posture of the reference value C3 in FIG. 2). Is driven up and down. The attitude of the ground contact float 16 at the reference value C3 is lower than the attitude shown in FIG. 2, so that the contact area of the ground contact float 16 with the rice field G increases, and the spring 21 extends to weaken the urging force of the spring 21. Therefore, in this state, the ground follow-up sensitivity of the ground float 16 to the rice field G, that is, the control sensitivity of the elevation control is changed to the sensitive side.

In the above lifting control, the adjusting lever 29
Is operated up and down to change the positions of the horizontal axis P1 and the ground float 16 up and down with respect to the seedling planting device 3. By doing this, the set height of the seedling planting device 3 to be maintained with respect to the rice field G (ground contact float 16) is changed up and down,
The planting depth of seedlings is changed. Even if the planting depth of the seedling is changed in this way, the vertical spacing between the ground float 16 and the potentiometer 19 is shown in FIG. 2 regardless of this, by the action of the first and second arms 26 and 27 of FIG. Since the interval is maintained, the reference value C set by the sensitivity setting switch 11 is set.
There is no change in 1, C2 and C3.

[Other Embodiments] In the above-described embodiment, as shown in FIG. 5, the type is such that the operation is switched between two states, a state A with a long cycle T and a state B with a short cycle T. The cycle T of FIG. 5 may be continuously changed according to the degree of deviation of the detected value from the reference value C1. Further, by omitting the on-off valve 14 in the configuration shown in FIG. 4 and switching the control valve 14 between the raised position 12U and the neutral position 12N or the lowered position 12D and the neutral position 12N at high speed, the control valve 12 can be operated. The function of the opening / closing valve 14 may be provided.

In the above-described embodiment, the present invention is applied to the elevation control for the elevation control of the seedling planting device 3 as the posture control means, but the rolling control of the seedling planting device 3 is used as the posture control means, and this rolling is performed. The present invention may be applied to control. In this case, the control sensitivity may be changed by changing the dead zone width of the rolling control.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Overall side view of the riding rice transplanter

FIG. 2 is a side view near the ground float and the potentiometer.

FIG. 3 is a front view around the ground float and the potentiometer.

FIG. 4 is a ground float and potentiometer, a control valve,
Diagram showing the linked state of the on-off valve

FIG. 5 is a diagram showing a switching state of the on-off valve.

[Explanation of symbols]

3 Seedling planting device 16 Grounding float 20 Lift detection members 26, 27, 29a Float posture adjusting mechanism 29 Adjusting lever 30 Lever guide P1 Horizontal axis core

Claims (3)

(57) [Claims] 1. A grounding float (16) is arranged in the lower part of the seedling planting device (3) substantially in the center of the left and right, and the grounding float (16) can be swung up and down around a rear horizontal axis (P1). A fixed portion of the seedling planting device (3), which is supported by the seedling planting device (3) and is located above the grounding float (16), in front of the fixed portion.
Lever guide of adjusting lever for seedling planting depth (29)
(30) is arranged and the left and right sides of the ground float (16) are
The lever guide (30) above the lateral side portion on one side.
So that the holding part of the adjusting lever (29) is positioned.
The grounding float (1) for the seedling planting device (3)
An elevation detection member (20) for detecting the elevation of 6) is provided on the front side of the ground float (16) on the front side of the fixed portion, and
The adjusting lever in the lever guide (30)
Left side of the ground float (16) with respect to the holding part of (29)
The seedling planting is arranged on the other side on the right side, and is based on the posture change of the grounding float (16) accompanying the change of the planting depth by the adjusting lever (29) .
Float posture that corrects the effect on the lifting control of the device (3)
Fix the adjusting mechanism (26), (27), (29a) to the above.
In front of the part and in the lever guide (30)
The ground flow rather than the holding part of the adjusting lever (29)
A riding-type rice transplanter located on the other side of the toe (16) . 2. The lever guide (30) is fixed to the fixing portion.
The riding type rice transplanter according to claim 1, which is supported by the minute . 3. The lever guide (3) is provided with the lift detecting member (20) from the left and right center of the grounding float (16).
The riding type rice transplanter according to claim 1 or 2, wherein the riding type rice transplanter is provided in a front portion of the grounding float (16) by being biased to the 0) side.