JP3432717B2 - Earth pressure sensing device in 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 portable rice transplanter and the like.
The planting machine is described in detail based on the earth pressure load acting on the float.
Control of the working unit via the hydraulic control valve
Earth pressure sensing device in transplantation machines that enables easy transplantation
Related. [0002] 2. Description of the Related Art A transplanting machine such as a riding rice transplanter has a manual position and
An elevation control lever operable to the automatic position is provided.
The planting section is controlled to move up and down by manual operation of the lever.
Acts on the float of the planting part at the automatic position of the lever
Detects the earth pressure and pressurizes the planting part so that it is in the proper planting position.
Performs automatic elevating control. [0003] By the way, when mud in the field scene is soft
Generally, the front part of the float falls and
The planting area sinks and the planting
The attachment depth is too deep. Conversely, the mud in the field scene is hard
If not, the front part of the float will rise
Rises and the planting depth becomes shallow,
It is easy to cause up and down swing frequently. As means for solving this, for example, flow
By changing the sensing point of earth pressure acting on
If the mud is soft, lower the sensing point
To detect earth pressure, and if the mud is hard,
Means for detecting earth pressure with a delay above (hereinafter the former conventional
Example) and changing the sensing load of the float
(Hereinafter, the latter conventional example) can be considered. [0005] As the former conventional example, a float is used.
The front part of the float is forcibly changed to the vertical position to float
To change the float sensing point up and down
There is known one adapted to a condition. [0006] As a conventional example of the latter, hardening of a field scene is considered.
It controls the vertical movement of the float with high sensitivity according to the softness,
By controlling the degree of blunting, the perceived load of the float
Have been changed to correspond.
Japanese Patent Publication No. 2-58892 and Japanese Utility Model Publication No. 59-30659
The technology described in the gazette is known. According to the latter conventional example, the mud is soft.
The spring is biasing the float toward the field scene.
The tension of the ring to reduce flow even with slight earth pressure.
Float can be moved up and down to control the float up and down with sharp sensitivity
And if the mud is hard,
To increase the floating dynamic resistance.
So that the float will not move unless the earth pressure is large
And control the vertical movement of the float with low sensitivity
I have. [0008] However, as described above,
According to the former conventional example, the flow depends on the hardness of the field scene.
Change the sensing point by forcibly adjusting the front of the
Therefore, the ground contact area of the float is
Is easy to flutter and very soft mud
In the case of soil, lower the front of the float and feel the earth pressure as soon as possible.
Even trying to know, the front of the float sinks and pushes the mud
However, there is a risk that it will go underground more and more.
Was. According to the latter conventional example, the float is
A spring biasing in the direction of the field is placed near the float
The biasing force of this spring is flowed through the link mechanism.
Connected to the splitter, and further operated by operating the adjustment lever.
The number of parts increases because of changing the tension of
And the structure becomes complicated. The present invention has been made to solve such a problem.
The purpose of the
Link in the middle of the sensing link mechanism that connects the
A ratio adjustment unit is provided, and the operation of the link ratio adjustment unit
Sensitivity and sensing load acting on the ground contact can be changed.
An object of the present invention is to provide an earth pressure sensing device in a transplanter. [0011] In order to achieve the above object,
In claim 1,PertainThe invention provides a traveling machine (5) with a field.
Moving while being touched by the sceneFloat (14)Work with
Operating section (10) is connected to the hydraulic system via the lifting link mechanism (8).
The lifting device is supported by a lifting device (19).
The hydraulic control valve (3) for controlling the cylinder device (19)
5) through the sensing link mechanism (15)float
(14)Linked toFloat (14)Soil acting on
Controlling the hydraulic control valve (35) based on the pressure load;
A transplanter for transplanting seedlings in a field scene in the working unit (10)
In (1),A wire member attached to the float (14);
Connect the float posture conversion unit (50) via (71)
And the float posture conversion unit (50)
Return force setting means for urging the control valve (35) in one direction
(45) connected to the sensing link mechanism (15)
And Based on the operation of the float posture conversion unit (50),
While the vertical position of the float front part can be changed freely,
The return is performed in conjunction with the operation of the float posture conversion unit (50).
The setting force of the force setting means (45) can be changed freely,
When the front of the funnel is operated to the raised position, the return force setting
The sensing link mechanism (1) by the setting force of the means (45);
5) The float sensing load acting on the flow increases,
When the front part is moved to the lower position, the float
Weight is reduced, Also, the sensing link mechanism (15) is an airframe.
Link ratio adjustment part in the middle part arranged along the front and rear direction
(20), based on the adjustment of the link ratio adjusting unit (20).
The float sensing load and the float (14)
The operation dead zone can be changed freely, and the link ratio adjustment unit (2
0) is set to a small link ratio and the float (14) is set.
If the dead band of operation is set to a large value,
The known load is reduced, and the link ratio adjusting unit (20) is increased.
Activate the dead zone of the float (14) by setting the link ratio
When the area is set small, the float sensing load increases.
Is set toIt is characterized by the following. [0012] [0013] [0014] (Action) that's allByThe transplanter (1) has a grounding body (14)
The working unit (10) is raised by the hydraulic cylinder device (19).
The hydraulic cylinder device (1
9) A hydraulic control valve (35) for controlling the sensing link
Connected to the grounding body (14) via a mechanism (15),
It is controlled based on the earth pressure load acting on the grounding body (14).
It is supposed to be. [0016]Then, the operation of the float posture conversion unit (50) is performed.
When the front part of the float is moved to the raised position based on the operation
Is a sensing link based on the set force of the return force setting means (45).
The float sensing load acting on the mechanism (15) increases.
The front of the float will not move unless the earth pressure is high
Swell. If the front part of the float is operated to the lower position,
If the earth pressure is small,
The float front also moves upward.The sensing link
The mechanism (15) has a link ratio adjusting unit (20)
To operate the link ratio adjusting unit (20).
Change the link ratio between the input side and the output side
Can be saidfloatBased on the earth pressure load acting on (14)
FollowfloatThe vertical movement amount of (14) is based on this link ratio adjustment.
The ratio can be changed to a predetermined ratio by operating the adjusting unit (20).
The hydraulic control valve (35) with the moved amount after the change
Is controlled. And, by changing the link ratio,
Of earth pressure sensitivity can be adjusted freely according to the field scene
You.That is, adjusting the link ratio adjusting unit (20).
And the dead zone of the float (14)
Can be changed. For example, the link ratio adjustment unit (2
If 0) is set to a low link ratio, float detection
The load decreases and the float front moves upward even with small earth pressure
And the hydraulic control valve (35)
(14) is transmitted.
You. In addition, the link ratio adjustment unit (20) has a large link ratio.
If set, the float sensing load is set to increase.
Before the float, unless there is a large earth pressure
Section will not move upward and the hydraulic control valve (3
5) A movement larger than the vertical movement amount of the float (14).
The momentum is transmitted. The reference numerals in parentheses described above refer to the drawings.
It is provided for reference, and does not limit the configuration of the present invention in any way.
It is not specified. [0018] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Form will be described. FIG. 1 shows the entirety of a riding rice transplanter to which the present invention is applied.
FIG. 2 is a side view of the body, and as shown in FIG.
Having a traveling body 5 supported by front wheels 2 and rear wheels 3
The traveling body 5 has an engine 6 mounted in front of it.
The seat 7 is placed at a substantially intermediate position between the front and rear wheels 2 and 3.
The driver's seat 9 having the following is provided. In this driver's seat 9
Is the engine throttle lever that controls the aircraft running speed
74, a planting clutch lever for turning on and off the planting clutch
70 (see FIG. 2). At the rear of the traveling machine body 5, a planting section (work
Part) 10 has an upper link 8a and a lower link 8b
The lifting and lowering link mechanism 8 supports the planting
The part 10 includes a large number of planting rods 11 and a float (grounding body) 1.
4, and a seedling mounting table 12 on which mat seedlings can be mounted is provided.
ing. In addition, this planting part 10 is provided with the lifting link mechanism 8.
B installed on the link support frame 55 (see FIG. 2) at the rear end
Rolling can be freely performed by a rolling shaft (not shown).
ing. [0021] Further, the traveling body 5 is provided at a front portion thereof.
Between the transmission case 16 and the lifting link mechanism 8
Is provided with a hydraulic cylinder device 19,
The cylinder device 19 is operated based on the operation of the hydraulic control valve 35.
The planting unit 10 is controlled to move up and down by expanding and contracting. The hydraulic control valve 35 is provided with a rotary pump.
Operation valve as shown in FIGS. 1 and 2.
A shaft located below seat 9 and integral with its spool
The arm 37 is attached to 35a. This arm
37 flows through the sensing link mechanism 15 described later.
Ground pressure acting on the float 14
The hydraulic control valve 35 is automatically controlled based on the movement.
As a result, the hydraulic cylinder device 19 expands and contracts.
I have. The float 14 is, as shown in FIG.
The rear part is connected to a shaft 58 provided below the transmission case 61.
Via arms 57 and 59 that can rotate integrally about
And pivotally mounted on a shaft, with a sensing plate 6
2 is pivoted and connected. The transmission case 61
The fulcrum shaft 67 provided at the bottom is provided with a planting depth adjusting lever 6.
8 and a bracket 66 are integrally fixed.
The bracket 66 and the arm 57 are pin-connected.
Manually operating the planting depth adjusting lever 68
This allows the float 14 to be adjustable in its vertical position.
Have been. Although detailed description is omitted, the planting
Operate the depth adjustment lever 68 up and down to move the float 14
Adjustment upward or downward causes the fulcrum shaft 67 to rotate.
At the same time as the connecting rod 65 moves,
The rotation fulcrum 60 of the arm 75 is
Move up and down around. The sensing plate 62 is provided as shown in FIG.
The lower end is pivotally supported on the float 14 by the connecting pin 62a.
And a long hole 62b is formed near the upper end thereof.
I have. Also, the upper end of the sensing plate 62 is
The wire 71 is fixed, and the inner
The pin 72 fixed to the wire 71a is inserted into the long hole 62b.
It is inserted. Here, the present embodimentThen, The sensing phosphorus
The link mechanism 15 has a link ratio adjusting section 20 in the middle thereof.
Based on the link ratio change of the link ratio adjustment unit 20,float1
Based on earth pressure load acting on 4float14 up and down movement
The hydraulic pressure is changed to a predetermined ratio, and the hydraulic pressure is
Controls the control valve 35likeare doing. That is, referring to FIG.
The mechanism 15 includes the sensing plate 62 and the sensing plate.
Sensing rod 3 connected to swinging arm 62 via swing arm 75
9 and the sensing rod 39 via the link ratio adjusting unit 20
And a continuous traction link 42 connected thereto.
The other side is connected to the hydraulic control valve 35. The oscillating arm 75 has a pivot fulcrum 60
Bifurcated arms 75a, 7 that can swing together as a heart
5b, the arms 75a, 75b
At the rear of the mechanism 8, the lower links 8b
The connecting plate 23 attached to the connecting shaft 21
Therefore, it is arranged close to the connection shaft 21. For this reason,
The pivot 60 is connected to the connecting shaft 21 of the lifting link mechanism 8.
On the other hand, the size between the rotation fulcrum 60 and the connection shaft 21 is equal to
It is rotatable with a new radius. Then, the sensing plate 62 and one of the
Is fitted into the elongated hole 62b of the sensing plate 62.
The arm 7 is connected via the inserted pin 72.
5a is an arc-shaped bay so as not to abut against the connecting shaft 21.
The song is formed. Also, at the tip of the other arm 75b
Is connected to the sensing rod 39 via the pin 32
I have. As described above, one of the swing arms 75
The distal end of the arm 75a is connected to the sensing probe through a pin 72.
The other end of the arm 75b
The side is connected to the sensing rod 39 via a pin 32
And these two connecting portions 72 and 32 are connected to the connecting shaft 21.
On the other hand, they are arranged substantially vertically apart. On the other hand, the pin 72 is
The ear 71 is connected, and the wire connecting pin 72 is
A spring 76 is stretched between the connecting pins 62a.
The spring 76 stretches the inner wire 7la,
Between the wire connecting pin 72 and the float connecting pin 62a.
Positioning the working length of the sensing plate 62 consisting of the length between
You have set. Next, the sensing rod 39 is moved in the longitudinal direction.
It has an elongated rod member at the center side,
The link fitting 40 is integrally attached to the part,
Has a pin joint 38 attached thereto. The link gold
In the tool 40, a pin 40a is erected near the center of one side,
A long hole 40b is formed at the other end. And before
The slot 40b is fixed to the tip of the swing arm 75b.
The pin 32 is fitted with the pin 32 and the pin 40a.
A spring 41 is stretched between them. The link ratio adjusting section 20 includes the sensing rod 3
9 has a conversion lever 22 for connecting the traction link 42 with the traction link 42.
Between the swinging end of the conversion lever 22 and the sensing rod 39.
The pin joint 38 is pivotally mounted on the pin 27 so as to be rotatable.
I have. The base end of the conversion lever 22 is pivotally connected.
It is rotatably mounted on the lower link 8b by the part 17.
You. The conversion lever 22 has a longitudinal direction.
A plurality of holes 22a are formed along the hole 22a.
One end of the continuous pulling link 42 by a pin 46 inserted into
Is attached. This pin 46 is inserted and removed.
You can change the insertion position freely,
For example, automatically insert the pin 46 via the actuator
Only the position can be controlled to change. The other end of the continuous traction link 42 is connected as described above.
To the arm 37 of the hydraulic control valve 35 via the pin 43
Are linked. Further, at the intermediate portion of the link 42
Has a pin 44 implanted therein, and the pin 44
A ring 45 is stretched and is returned by the return spring 45.
The continuous traction link 42 is constantly urged in the downward direction of the float 14.
Have been. As described above, the link ratio adjusting unit 20
The connecting lever 22 is connected to the conversion lever 22 by connecting and disconnecting the pin 46.
When the connection point with the link 42 is changed, the
The amount of rotation of the sensing rod 39 as a center (up and down of the float 14)
Movement amount) and the amount of rotation of the continuous tow link 42 correspond to the connection point.
Will be changed. For example, in FIG.
The distance between the pivot joint 17 on the base side and the pin 27 on the tip is
R, the distance between the pivot joint 17 and the intermediate pin 46 is r
Then, the rotation amount of the sensing rod 39 (above the float 14)
The ratio between the downward movement amount) and the rotation amount of the continuous traction link 42 is R / r.
And the amount of rotation of the sensing rod 39 is reduced to the continuous traction link 42.
It is transmitted as a reduced movement amount. And these predetermined
The hydraulic control is performed according to the movement amount after the change to the ratio.
The valve 35 is controlled. Further, the present embodimentThen, The float 1
4 through the link ratio adjusting unit 20.
And change it to the specified ratio.
Controls the hydraulic control valve 35Asare doing. That is, in the link ratio adjusting unit 20,
The conversion lever 22 by inserting and removing the intermediate pin 46.
When the connection point with the continuous traction link 42 is changed, the pivot connection portion 1
(Float) applied to the sensing rod 39 centering on
14 sensed load) and the load transmitted to the continuous traction link 42
It is changed according to the connection point. For example, as described above, the conversion lever 22
The distance between the pivot joint 17 and the pin 27 at the tip is R,
Assuming that the distance between the connection portion 17 and the intermediate pin 46 is r, the sensing is performed.
The load applied to the rod 39 (the load sensed by the float 14)
The ratio to the load transmitted to the continuous traction link 42 is opposite to the above.
And the load applied to the sensing rod 39 is increased.
And transmitted to the continuous traction link 42. This is referred to as the sensed load of the float 14.
From the point of view, the float 14 is urged downward.
When the biasing force of the return spring 45 is P,
The load reduced to Pr / R is transmitted to
Of the float 14 is proportional to the load (Pr / R)
Acts in the downward direction (however, the weight of the float itself and the phosphorus
(Excluding friction between hooks). On the other hand, the link ratio adjusting unit 20
If the link ratio does not change (link ratio = R / R),
The urging force P of the return spring 45 is applied to the sensing rod 3 as it is.
9, the link ratio is changed as described above.
And smaller than when the link ratio is not changed
The load acts on the float 14 in the lowering direction. Therefore,
When the link ratio is changed, the float 14
Can be moved upward, thus allowing the float-sensitive load
Weight is changed. In the above description, the link ratio adjusting unit
Adjustment of link ratio of 20 enables sensitivity of earth pressure sensing and float feeling
Even if the intelligible load is changed, the sliding posture of the float 14 is not changed.
It does not change. Next, the present embodimentThen, The float 1
4. Float attitude converter via wire member 71(sensitivity
Adjustment lever) 50And the float posture conversion unit50
The vertical position of the front part of the float can be changed freely by the operation of
And the earth pressure load acting on the float 14
To a predetermined ratio via the link ratio adjustment unit 20
Then, the hydraulic control valve 35 is controlled with the changed load.
Dolikeare doing. That is, the slot 6 of the sensing plate 62
2b is connected to the inner wire
Sensitivity adjustment lever (float attitude conversion unit) via 71b
It is connected to the actuating part 50a on the base side of the part 50. Soshi
By operating the sensitivity adjusting lever 50, the operating portion
50a rotates around the rotation fulcrum 51,
The inner wire 71b is operated to expand and contract. Thus,
The vertical position of the front part of the float 14 has been changed,
Is changed. Therefore, the operation of the sensitivity adjusting lever 50 is
While making it possible to change the sliding posture of the float 14,
Acts on the float 14 by the link ratio adjusting unit 20
Change the earth pressure load to the specified ratio and the float load after the change
If the hydraulic control valve 35 is controlled at
Freely set the float position according to the float sensing load
can do. Further, the present embodimentThen, The float 1
4, the float posture changing unit via a wire member 71;
50, and the float posture conversion unit 50 is
Return force setting for returning the hydraulic control valve 35 in one direction
Means45Connected to the sensing link mechanism 15 through
By the operation of the float posture conversion unit 50, the flow
Change the vertical position of the front part of G14freelyAnd the above
The return force setting in conjunction with the operation of the funnel attitude conversion unit 50
means45Change the setting power offreelyAnd In FIG. 3, the sensitivity adjusting lever 50
Is connected to a wire 24, and the other end of the wire 24 is
Via the spring (return force setting means) 45,
It is connected to a pin 44 erected on the link 42. Said
The return spring 45 always keeps the hydraulic control valve 35 floating.
It serves to urge the seat 14 in the downward direction. That is, the wire 24 is shown in FIG.
As shown in FIG.
A connection fitting 25 is attached to one end of the ear 24a,
Hinge portion 26 is attached to the second member. And the series
The fitting 25 has a round hole 28 and an oblong hole 29 formed therein.
The connection fitting 25 can be adjusted in sensitivity through the oblong hole 29.
The lever 50 is engaged with the projection 50b. The round hole 28 has a throttle wire.
One end of the wire 73 is continuously pulled, and the other end of the wire 73 is
It is connected to an engine throttle lever 74. As described above, the sensitivity adjusting lever 50 is tilted.
When the moving operation is performed, the operating portion 50a is also centered on the rotation fulcrum 51.
And swings as a bobbin connected to the operating portion 50a.
Up and down of the front part of the float 14
The position changes. At the same time, this sensitivity adjustment
The wire 24 locked to the projection 50b of the lever 50
By moving within the length of the oblong hole 29 of the fitting 25,
Accordingly, the urging force of the return spring 45 is changed. Change of the urging force of the return spring 45
Is the link between the continuous traction link 42 and the link ratio adjusting unit 20,
It is transmitted to the float 14 via the knowledge rod 39 and the like,
The sensing load is changed. Thus, the sliding posture of the float 14
And the feeling of the float 14 by the return spring 45
Since it is possible to change the intellectual load, for example,
On the surface, the float sensing load is reduced and the sensing point
Speed, and increase the float sensing load on hard rice fields
By delaying the sensing point together, from the hard rice field
The range of application can be extended to soft rice fields
You. Further, the present embodimentThen, The float 1
4 through the link ratio adjusting unit 20.
To the hydraulic control valve 35 with a small link ratio.
Set the dead zone of float 14 to largeDoWith
At a high link ratio via the link ratio adjusting unit 20.
Actuation of the float 14 by transmitting it to the hydraulic control valve 35
Set dead band smalldo itI have. That is, the vertical movement amount of the float 14
If the value is constant, adjust the link ratio adjusting unit 20
When a smaller link ratio is set, the hydraulic control valve 3
5 has a movement amount smaller than the vertical movement amount of the float 14.
Is transmitted. As a result, the float 14 moves up and down by a predetermined amount.
Even if it moves, only a small amount of displacement is transmitted to the hydraulic control valve 35.
The hydraulic control valve 35 is only slightly displaced.
Without this, the operation dead zone of the float 14 becomes large. On the contrary, the link ratio adjusting unit 20 is adjusted.
When a larger link ratio is set, the hydraulic control valve
35 is a movement amount larger than the vertical movement amount of the float 14
Is transmitted. As a result, the float 14 moves up and down by a predetermined amount.
, The hydraulic control valve 35 also has a large displacement amount.
Because the power is transmitted, the hydraulic control valve 35 is also greatly displaced.
However, the operation dead zone of the float 14 becomes smaller. Thus, the operation dead zone on a soft rice field
Should not react to slight irregularities on the rice field.
Hunting of the hydraulic control valve 35 is prevented.
On hard surfaces, the dead band is reduced to
14, the contact pressure is increased, and small irregularities are caused by the contact pressure.
It can be smoothed by the ground pressure of the float 14. Next, the operation of the above-described embodiment will be described.
Will be described. The elevation control lever (not shown) is operated to the automatic position.
When it is made, it swings based on the earth pressure acting on the float 14.
Hydraulic control by sensing link mechanism 15 via arm 75
The valve 35 is controlled. That is, the planting section 10 is properly planted.
Position, the operating shaft 35a of the hydraulic control valve 35 is
The control plate (not shown) is at a fixed position
Hold the control valve 35 to move the planting section 10 to that position
Hold. From this state, the planting section 10 moves
As the pressure rises and the earth pressure acting on the float 14 decreases,
The front of the funnel 14 is lowered, and the movement is detected by the sensing plate 62.
And the pin 7 positioned at a predetermined position of the long hole 62b
Counterclockwise rotation of the swing arm 75a through
Transmitted to the swing arm 75 b via the pivot 60.
Also rotates in the same direction and presses the sensing rod 39 to the left.
You. Prior to the planting operation, the link ratio must be adjusted in advance.
Adjust the link ratio of the adjusting section 20 by inserting and removing the pin 46.
However, in this example, it is assumed that the rice pad
Position 46 at the intermediate position in the longitudinal direction of conversion lever 22
Keep it. And, for example, in FIG.
R is the distance between the pivot connection portion 17 of the 22 and the pin 27 at the tip.
Let r be the distance between the pivot connection 17 and the intermediate pin 46.
You. At this time, the sensing rod 39 is pushed to the left.
The pressure is applied to the conversion lever 22 around the pivot joint 17.
Turn counterclockwise. Then, the pivot connecting portion 17 is
The amount of rotation of the sensing rod 39 in the counterclockwise direction,
The ratio of the tow link 42 to the amount of rotation in the same direction is R / r.
The amount of rotation of the sensing rod 39 is reduced,
42 is transmitted as the amount of movement to the left in the drawing. Further, the diagram transmitted to the continuous traction link 42
The amount of movement to the left of the plane is transferred to the arm 37 via the pin 43.
Transmitted to the operating shaft 35a of the hydraulic control valve 35 in a clockwise direction.
The hydraulic control valve 35 to the hydraulic cylinder
The system is switched to discharge the oil in the device 19, and
The placement 19 is contracted to lower the planting section 10. On the contrary, the planting section 10 descends and the flow
When the earth pressure acting on the float 14 increases,
Is lifted, and the movement is detected by the sensing plate 62 and the swing arm 7.
5a, 75b, and the conversion lever via the sensing rod 39.
-22 is rotated clockwise about the pivot joint 17.
Let The rotation of the conversion lever 22 causes the continuous traction link 4
2 is transmitted as the amount of movement to the right in the drawing.
It is transmitted to the arm 37 via the link 42 and the pin 43,
The operating shaft 35a of the hydraulic control valve 35 is rotated counterclockwise.
Then, the hydraulic control valve 35 is connected to the hydraulic cylinder device 19.
The pressure is switched to pressure oil, and the cylinder device 19 is switched.
And extend the planting section 10 to the appropriate position.
You. In the above, the biasing of the return spring 45
Assuming that the force is P, the sensing rod 39 is moved based on the biasing force.
The load acting leftward in FIG. 3 is Pr · R (= P
Smaller) and the load proportional to this is float 1
4 is urged downward. That is, float 14
The biasing force in the direction is determined by the biasing force P of the return spring 45.
The float 14 with a small perceived load.
Is controlled. Conversely, the link ratio adjusting unit 20
If the link ratio of
The float 14 is controlled by the sensing load. The link
Float sensing load by link ratio adjustment of ratio adjustment unit 20
Changing the float running posture does not change.
No. On the other hand, for example, the seedlings are transferred to an extremely soft rice field.
In case of planting, the float sensing load was further reduced
Can not be handled only by adjusting the link ratio
It is possible. In such a case, adjust the link ratio
And change the sliding posture of the float 14,
Change of float sensing load and change of float 14 sensing point
And are used together. That is, for example, when the sensitivity adjusting lever 50 is
The tilt operation is performed in the direction of arrow A in FIG. Then, the sensitivity adjustment level
FIG. 7 is a view showing an operation portion 50 a of a bar 50 centered on a rotation fulcrum 51.
Turn to the right. As a result, the Bowden wire 71
Of the inner wire 71a is loosened, and the
The tension of the pulling 76 decreases,Sensing plate described above
62 has a shorter working length,It becomes a bitter. For this reason, the sensing point of the float 14 is
UpTo the earth pressure fluctuationlateIs sensed. As a result,
Pressure fluctuation is applied to the hydraulic control valve 35lateCommunicated and planted
The lifting and lowering 10 is properly controlled. In addition, contrary to the above,
The tilt adjustment lever 50 is tilted in the direction of arrow B in FIG.
And the float 14 frontunderThe sensing port of the float 14
IntunderMove towards Further, as described above, the sensitivity adjusting lever 50 is
When the tilting operation is performed, the hydraulic control valve 35 is operated in conjunction with the tilting operation.
The urging force of the return spring 45 urged in the lowering direction
fluctuate. That is, the sensitivity adjusting lever 50 is moved by an arrow
When the tilting operation is performed in the direction A, the return
The urging force of the ring 45 increases, and the float 14 is lowered.
The force to urge increases. Thus, the float sensing load
Becomes heavier. Conversely, the sensitivity adjustment lever 50 is
When the tilting operation is performed in the direction B, the return
The biasing force of the ring 45 is reduced, and the float sensing load is light.
Become. As described above, the operation of the link ratio adjusting unit 20
And the operation of the sensitivity adjustment lever 50
Maintain proper planting depth and planting posture according to the hardness of the rice field.
You can have. [0071] As described above, according to the first aspect of the present invention,
According to Ming, the earth pressure sensing sensitivity can be arbitrarily changed by changing the link ratio.
Can be changed, depending on the hard and soft field scene
Free planting by freely adjusting the sensitivity of earth pressure sensing
Can be. Further, for example, by changing the link ratio,
The amount of vertical movement can be reduced and transmitted to the hydraulic control valve.
Can move the float due to slight irregularities in the field scene.
Hunting of hydraulic control valve does not occur depending on movement
In this way, stable running can be achieved. [0073]Furthermore,Float sensing load due to link ratio change
The variable weight makes it possible to switch from a soft field scene to a hard field scene.
Good planting work that can cover a wide range
Becomes possible. Also, without changing the posture of the float
Float sensing load can be changed, for example, in soft fields
Mud push is eliminated even in the scene, the float sliding posture
Can be better. Therefore, the traveling speed of the
And work efficiency can be improved. Further, as in the conventional case, the device is arranged near the float.
Compared to changing the ground pressure by changing the tension of the placed spring.
The structure is simple and the number of parts is small. [0076]Furthermore,Float due to link ratio change
Flow by change of intellectual load and operation of float posture conversion unit
The change in the posture of the float is also used,
The position of the float can be set freely.
The work area can be greatly expanded depending on the hardness of the scene.
Wear. Also, the load detected by the float due to the change of the link ratio
Even if the sensing point fluctuates slightly due to
The movement can be modified by changing the float posture, so
Less variation in float posture and stable planting performance
Leads to. Further, the change of the float sensing load and the float
You can change the posture, so it is soft from hard field scene
It can cover a wide range up to the field scene. [0079]Also,Sensing point by changing the posture of the float
The return load and the return load setting means
Since both float sensing load changes are possible,
For example, in soft field scenes, reducing the float sensing load
Both change the float position to speed up the sensing point,
In heavy field scenes, increase the float sensing load and
By changing the attitude and delaying the sensing point,
Wide range from hard field to soft field
Planting performance is also improved. Further, the flow is adjusted according to the float sensing load.
Position can be selected freely, even in soft field scenes.
Pushing is eliminated, and the proper planting depth and planting posture are obtained.
be able to. [0081]Furthermore,Flow when the float sensing load is small
The dead band of operation of the float becomes large, and the float
In the case of, the float dead band becomes smaller,
In paddy fields, the dead zone becomes large
Hunting of hydraulic control valve without reacting to unevenness
Can be prevented. Also, in hard field scenes, float
Since the perceived load increases, small irregularities can be floated.
The planting depth is kept constant.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a riding rice transplanter to which the present invention is applied. FIG. 2 is a side view showing the whole earth pressure sensing device according to the present invention. FIG. 3 is a side view showing a main part of the earth pressure sensing device. FIG. 4 is an explanatory diagram of a wire connecting a sensitivity adjusting lever and a return spring. [Description of Signs] 1 Riding rice transplanter 5 Traveling body 8 Lifting link mechanism 10 Planting unit 14 Float 15 Sense link mechanism 19 Hydraulic cylinder device 20 Link ratio adjusting unit 21 Connecting shaft 22 Conversion lever 35 Hydraulic control valve 39 Sense rod 45 Return Spring 50 Sensitivity adjusting lever 62 Sensing plate 70 Planting clutch lever 71 Bowden wire 74 Engine throttle lever

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-129905 (JP, A) JP-A-8-196116 (JP, A) JP-A-6-153630 (JP, A) 117618 (JP, U) Shokai Sho 55-27028 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01C 11/02

Claims (1)

(57) [Claims] 1. A traveling machine which is grounded on a field scene and moves
TofloatWorking section with a lifting link mechanism
It is supported by a hydraulic cylinder device to lift and lower
A hydraulic control valve that controls the
Through the structurefloatLinked tofloatActs on
Controlling the hydraulic control valve based on the earth pressure load
In the transplanting machine for transplanting seedlings to the field scene in the working section,Float posture change to the float via a wire member
Connecting the float position changing unit with the oil
Via a return force setting means for urging the pressure control valve in one direction
Connected to the sensing link mechanism, Based on the operation of the float posture conversion unit, the float
The front vertical position can be changed freely, and the float
Setting force of the return force setting means in conjunction with the operation of the force conversion unit.
Can be changed, and the float front is operated to the raised position.
The return of the sensing force by the set force of the return force setting means.
Floating sensing load acting on the link mechanism increases,
When the front of the funnel is operated to the lower position,
Knowledge load decreases, In addition, the sensing link mechanism is arranged along the longitudinal direction of the fuselage.
A link ratio adjustment unit in the middle of the
The float sensing load and the flow
The link ratio adjustment unit.
Is set to a low link ratio and the float dead zone
If the area is set large, the float sensing load will decrease
Before setting the link ratio adjustment unit to a large link ratio.
If the dead band of the float is set small,
Float sensing load is set to increase, An earth pressure sensing device in a transplanter, characterized in that: