JPH08140433A - Multi-row planting type rice transplanter - Google Patents

Abstract

(57) [Abstract] [Purpose] While avoiding damage to the groove trace depth detection means due to collision of the side float with another object of the second grounding body, sufficient leveling action can be obtained, A shape that avoids lodging of already planted seedlings due to misalignment or mud pushing to enable stable and accurate planting of seedlings. [Structure] A side float 16B for leveling, which is vertically swingably mounted on a seedling planting device 5 at the rear of the traveling machine body 1, is provided with a broadly shaped leveling part 16c for leveling the three planting points. , A pair of left and right extending portions 16d and 16e extending in parallel rearward from the ground leveling portion 16c so as to be located between the respective lines, and the extending portion 1
Of the 6d and 16e, the inner extending portion 16d adjacent to the center float 16A is formed shorter than the outer extending portion 16e spaced apart from the center float 16A, and a groove is formed immediately after the inner extending portion 16d. Trace depth detection means 31
The second grounding body 31B of No. 1 was arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a seedling planting device equipped with a center float and a side float for leveling to the rear part of a traveling machine body so as to be vertically swingable, and is capable of being driven up and down. At the time of work, automatic lifting control means for automatically lifting the seedling planting device based on the float displacement information from the float sensor for detecting vertical swing displacement of the center float, and forming after the side float passes through the mud surface The mud hardness is detected based on the groove depth information from the groove depth detection means that detects the groove depth, and the sensitivity target value of the float sensor is automatically selected according to the mud hardness. Equipped with a controller equipped with an automatic sensitivity adjusting means for automatically adjusting the sensitivity of the float sensor, and the groove trace depth detecting means is adapted to ground the mud surface of the field to follow the mud surface level. A first grounding body for converting the change into vertical swing displacement, and a second grounding body for converting the change in the level of the bottom surface of the groove trace into a vertical swing displacement by following the ground contact with the bottom surface of the groove trace formed after the side float passes through the mud surface. Multi-row planting type rice transplanter composed of a grounding body and a potentiometer that detects relative swing displacements of the grounding bodies and outputs a voltage level according to the relative swing displacements as groove trace depth information. Regarding

[0002]

2. Description of the Related Art In an eight-row planting type rice transplanter, which is an example of a multi-row planting type rice transplanter as described above, a seedling planting device is automatically moved up and down based on float displacement information from a float sensor. By doing so, the accuracy of seedling planting by the seedling planting device is improved. Also, by automatically adjusting the detection sensitivity of the float sensor based on the groove trace depth information from the groove trace depth detection means, seedlings can be planted according to the mud hardness of the field without the need to manually adjust the sensitivity. By making it possible to plant seedlings by the device, the precision of seedling planting by the device for planting seedlings is further improved. Furthermore, by causing the center float located in the lower center of the seedling planting device, which is below the connecting portion with the traveling machine body, to function as a sensor float in which the vertical swing displacement is detected by the float sensor, Compared to the case where the side float displaced from the lower side of the connection part to the left and right functions as the sensor float, seedling planting with the connection part with the traveling machine body caused by running or seedling planting operation during seedling planting work as a fulcrum The detection error of the float sensor caused by the swing of the device is made as small as possible.

By the way, conventionally, in the above-mentioned eight-row planting type rice transplanter, the center float is arranged at the lower center of the seedling planting device, which is below the connecting portion with the traveling machine body. As shown in FIG. 13, the center float 45A and the left and right side floats 45B adjacent to the center float 45A are provided with a leveling part 45 formed so as to have a leveling effect on a planting portion of two rows.
a, 45b and the leveling part 45 so that it is located between the lines.
an extending portion 45c extending rearward from a, 45b,
The left and right side floats 45C, which are formed in a T shape composed of 45d and 45d, are formed on the left and right side floats 45C so as to have a leveling effect on the planting portion of one line, and Leveling section 45 so that it is located on the left and right of the strip
A pair of left and right extending portions 45 extending rearward from e
A U-shaped member composed of f and 45 g was adopted. Further, the left and right side floats 45B adjacent to the center float 45A are provided with the second grounding bodies 31B of the groove trace depth detecting means 31 immediately after the side floats 45B. Of the other floats 45A and 45C to the extent that they are close to the float swing fulcrum.
It was formed shorter than c, 45f, and 45g.

[0004]

However, if U-shaped floats are adopted for the left and right side floats located outside, the U-shaped floats will be located further outside the planting site on the outside where the side floats will be used. Since one of the extension parts is located, the distance between the existing seedlings planted in the previous seedling planting run and the planted seedlings planted in the current seedling planting run will be larger than in other rows. After the planting work, the spacing between the rows becomes uneven and the appearance becomes poor, or the number of rows to be planted in the field is reduced. In addition, if this side float is brought close to the planted seedlings so that the spacing between the planted seedlings and the planted seedlings is the same as that between other seedlings, the planted seedlings will be removed by the mud pushing of the extension located outside. There was the inconvenience of lying down. By the way, as the left and right side floats located on the outside, a U-shaped float with the outer extending portion cut off (the U-shaped float shown in FIG. 13 is cut at the position indicated by the chain double-dashed line). It is also possible to adopt a different shape), but since the ground leveling part has a shape with poor stability that protrudes to one side of the front part of the extension part that has the swing fulcrum of the float, a sufficient leveling effect is obtained. It becomes impossible to obtain the seedlings, which causes a problem that the seedling planting accuracy is adversely affected by the seedling planting device.

On the other hand, the left and right side floats adjacent to the center float are arranged immediately after this by forming the extending portions thereof so short that their extending ends are close to the float swing fulcrum. Since the second ground contacting body of the groove trace depth detecting means is not projected from the extension end of the extending portion of another float, damage to the groove trace depth detecting means due to collision with another object is avoided. However, the distance from the rocking fulcrum of the float to the extension end becomes shorter, and the tension of the float decreases, resulting in insufficient ground leveling action. Inconvenience that adversely affects the automatic sensitivity adjustment of the float sensor based on groove depth information,
Alternatively, in the case where fertilizer application is carried out at the same time as planting of seedlings, there has been a problem that the soil covering action on fertilizer of the fertilizer application groove formed by the grooving device is deteriorated.

It is an object of the present invention to obtain a sufficient leveling action while avoiding damage to the groove trace depth detecting means due to the side float colliding with another object of the second grounding body.
The aim is to make it possible to stably and accurately plant seedlings by using a shape that can avoid the lodging of the seedlings that have already been planted due to the unevenness of the rows or the pushing of mud.

[0007]

In order to achieve the above object, in the first aspect of the present invention, a seedling planting device equipped with a center float and a side float for leveling on a rear portion of a traveling machine body so as to be vertically swingable. The drive can be moved up and down, and
During seedling planting work, automatic raising and lowering control means for automatically raising and lowering the seedling planting device based on float displacement information from a float sensor that detects vertical swing displacement of the center float, and mud level passage of the side float. The mud hardness is detected based on the groove depth information from the groove depth detection means that detects the groove depth formed later, and the sensitivity target value of the float sensor is automatically set according to the mud hardness. A control device equipped with an automatic sensitivity adjusting means for automatically adjusting the sensing sensitivity of the float sensor selected is mounted, and the groove trace depth detecting means is mounted on the mud surface of the field to follow the ground contact to make the mud. A first grounding body that converts a change in surface level into a vertical swing displacement, and changes the level of a groove trace bottom surface into a vertical swing displacement by following the ground contact with the bottom surface of a groove trace formed after the side float passes through the mud surface. Second grounding to , And, in the eight-row planting type rice transplanter configured by a potentiometer that detects the relative swing displacement of these grounding bodies and outputs a voltage level corresponding to the relative swing displacement as groove trace depth information, A side float is a wide ground leveling part that has a leveling effect on three planting points, and a pair of left and right sides extending in parallel from the leveling part to the rear so as to be located between the lines. Of the extension part, and the inner extension part of the extension part adjacent to the center float is formed shorter than the outer extension part separated from the center float, and the inner part of the extension part is formed. The second grounding body was arranged immediately after the extended portion of the.

According to the second aspect of the present invention, the rear part of the traveling machine body is connected to a seedling planting device equipped with a center float and a side float for leveling so as to be vertically swingable, and is vertically movable, and at the time of seedling planting work. An automatic lifting control means for automatically lifting the seedling planting apparatus based on float displacement information from a float sensor for detecting vertical swing displacement of the center float, and the side float formed after passing through the mud surface The mud hardness is detected based on the groove depth information from the groove depth detecting means for detecting the groove depth, and the sensitivity target value of the float sensor according to the mud hardness is automatically selected and Equipped with a control device equipped with an automatic sensitivity adjusting means for automatically adjusting the sensing sensitivity of the float sensor, and the groove trace depth detecting means, the mud surface level of the mud surface of the field to follow the mud surface level The first grounding body for converting the verticalization into vertical swinging displacement, the second grounding body for converting the change in the bottom level of the groove trace into the vertical swinging displacement by following the grounding of the bottom surface of the groove trace formed after the side float passes through the mud surface. An eight-row planting type rice transplanter configured with a grounding body and a potentiometer that detects the relative swing displacement of the grounding bodies and outputs a voltage level corresponding to the relative swing displacement as groove trace depth information. ,
The side float is a wide ground leveling section that acts on the ground for three planting points, and the left and right sides that extend in parallel from the ground leveling section toward the rear so as to be located between the sections. A pair of extension parts, and of the extension parts, an outer extension part separated from the center float is formed shorter than an inner extension part adjacent to the center float, and The second grounding body was arranged immediately after the outer extending portion.

[0009]

According to the first aspect of the present invention, the side float is directed rearward from the ground leveling section so as to be located between the ground leveling sections which are formed to have a wide ground leveling effect on the planting points for three rows and between the respective rows. Since it is composed of a pair of left and right extension parts that are extended in parallel with each other, it is possible to eliminate the extension part that is located further outside the outer planting site that is grounded by the side float. , It is possible to make the spacing between the planted seedlings and the planted seedlings the same as that between the other rows without inconvenience of overlying the planted seedlings by pushing the mud at the extension part. Further, this makes it possible to improve the appearance after the completion of the seedling planting work, and the inconvenience that the number of rows between the already planted seedlings and the planted seedlings becomes larger than the other rows and the number of planting rows for the field decreases. It can be resolved. Moreover, among the left and right extending portions extending from the leveling portion, the inner extending portion adjacent to the center float is formed to be shorter than the outer extending portion separated from the center float, so that the groove trace depth can be increased. Since the second grounding body of the detecting means can be arranged immediately after the inner extending portion so as not to project from the extending end of the other float, the groove trace due to the collision with the other object of the second grounding body Damage to the depth detection means can be avoided. Furthermore, by forming the inner extension part short, the distance from the swing fulcrum of the float to the extension end at this extension part is shortened, and even if the tension force due to this extension part is reduced, the same leveling is achieved. The outer side extended part is formed to be long, and the distance from the swing fulcrum of the float to the extended end at this extended part is made sufficiently long, so that the side float as a whole is sufficient. Since it is possible to have a straddling force, it is possible to obtain a sufficient leveling action, thereby enabling accurate automatic sensitivity adjustment of the float sensor based on the groove trace depth information from the groove trace depth detection means. As a result, stable and accurate planting of seedlings can be performed, and in the case where fertilization is performed at the same time as planting seedlings, soil covering fertilizer in the fertilizer ditch formed by the grooving device is covered. Become sufficiently obtained as a use.

According to the second aspect of the present invention, it is possible to obtain the same action as that of the first aspect of the present invention described above, and, in addition, in the extension portion extended from the ground leveling portion, the extension outside the center float is separated. By forming the projecting portion to be shorter than the inner extending portion adjacent to the center float, and arranging the second grounding body of the groove trace depth detecting means immediately behind the outer extending portion, Since the second grounding body can be made to follow the bottom surface of the groove trace in the portion where the wheel does not pass, there is a possibility that it will occur when the second grounding body is made to follow the bottom surface of the groove trace in the place where the wheel passes. The malfunction of the second grounding body due to the influence of the wheel marks (irregularities formed by the wheel lugs) can be eliminated, and the groove mark depth detection means can accurately detect the groove mark depth. Further, by doing so, it becomes possible to plant seedlings with higher accuracy. In addition, since the inner extending portion on the side through which the wheel passes is formed long, a sufficient leveling action for the wheel mark can be obtained.

[0011]

Therefore, according to the first aspect of the present invention, the side float has a sufficient leveling action while avoiding the damage of the groove trace depth detecting means due to the collision with the other object of the second grounding body. At the same time, it has become possible to provide a rice transplanter capable of stably planting seedlings with high precision by adopting a shape that can avoid the lodging of the seedlings that have already been planted due to the unevenness of the rows and the pushing of mud.

According to the second aspect of the present invention, it is possible to provide a rice transplanter capable of stably planting seedlings with higher accuracy.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire side surface of a Hachijo planting type rice transplanter. This rice transplanter is a riding type traveling machine body 1.
And a movable lift mechanism 3 is provided at the rear part of the traveling machine body 1 via an ascending / descending link mechanism 2 so as to be able to move up and down, and
It is constituted by a seedling planting device 5 for eight-row planting, which is connected to be rotatable around the front-rear axis center by the operation of an electric rolling motor 4. An engine 6 is mounted on the front portion of the traveling body 1, and the power taken out from the engine 6 is used as a belt type continuously variable transmission 7 and a transmission case 8.
It is adapted to be transmitted to the front wheels 9, the rear wheels 10, and the seedling planting device 5 via the above.

As shown in FIGS. 1 and 2, the seedling planting device 5
Is a feed case 11 to which power from the engine 6 is transmitted, a support frame 12 extending from the feed case 11 to the left and right, and a frame-combined plant extending from the support frame 12 to the rear in four rows. Transmission case 13,
A pair of left and right planting mechanisms 14 pivotally supported at the rear of each planted transmission case 13, a seedling mounting table 15 that reciprocates laterally with a fixed stroke with respect to the planted transmission case 13, and a planted transmission case 13. The ground level float 16 is provided so that its relative height can be adjusted relative to the.

As shown in FIGS. 2 to 5, a float fulcrum pipe 17 which is laterally bridged across the left and right planting transmission cases 13 is provided at the front of each planting transmission case 13.
It is pivotally connected so as to be rotatable around 1. On the float fulcrum pipe 17, a swing arm 18 that integrally rotates with the float fulcrum pipe 17 is extended in parallel rearward. The grounding float 16 is connected to the rocking ends of the respective rocking arms 18 via a support shaft 19 so as to be vertically rockable around the axis P2. An operating lever 20 extending toward the traveling machine body 1 is integrally and rotatably connected to and fixed to the float fulcrum pipe 17. The operation lever 2 is attached to the support frame 12 by engagement with the operation lever 20.
The locking plate 21 that holds 0 at an arbitrary position is the support plate 22.
It is connected and fixed via. That is, the operating lever 20
Is operated around the axis P1 of the float fulcrum pipe 17 and locked and held at an arbitrary position by engaging with the locking plate 21, thereby adjusting the relative height of the leveling float 16 with respect to the planted transmission case 13. The planting depth of seedlings can be changed according to the hardness of mud in the field.

As shown in FIGS. 3 and 4, the ground float 16 has a ground pressure (ups and downs on the mud surface of the field) at a position above the front of the center float 16A located at the center of the seedling planting device 5. A potentiometer type float sensor 24 is provided for detecting the vertical swing displacement of the center float 16A due to fluctuations via the link mechanism 23. The float sensor 24 is supported by a bracket 26 that is pivotally supported at the ends of a pair of upper and lower links 25 that are pivotally supported so as to be vertically swingable with respect to the support plate 22. The other end of the link 25 located on the upper side of the pair of upper and lower links 25 is engaged with the pin 20a extending from the operating lever 20, and the grounding float for the planted transmission case 13 is operated by operating the operating lever 20. As the relative height of 16 is adjusted, the relative height of the float sensor 24 with respect to the planted transmission case 13 is also adjusted.

As shown in FIG. 6, the float sensor 24
Converts the vertical swing displacement of the center float 16A into a voltage level and outputs the voltage level to the control device 27 as float displacement information. Control device 27
Is based on the float displacement information from the float sensor 24 so that the reference voltage level of the float sensor 24 indicating the reference attitude of the center float 16A and the voltage level (float displacement information) output from the float sensor 24 match. The operation of the electromagnetic control valve 28 is controlled to raise and lower the seedling planting device 5.

For example, when the reference position of the operating shaft 24b with respect to the sensor body 24a for obtaining the reference voltage level is the position a in FIGS. 3 and 6, the center float 1
Assuming that the actual operating position of the operating shaft 24b rotated by the vertical swing of 6A is the position b in FIGS. 3 and 6, the control device 27 controls the operation of the electromagnetic control valve 28 and the sensor body. The center float 16A is returned to the reference posture by raising the seedling planting device 5 so that the reference position of the operation shaft 24b with respect to 24a and the actual operation position match (reference voltage level and output voltage level match). Of. If the actual operation position of the operation shaft 24b rotated by the vertical swing of the center float 16A is the position c in FIGS.
Controls the operation of the electromagnetic control valve 28 so that the sensor body 24
The center float 16A is returned to the reference posture by lowering the seedling planting device 5 so that the reference position of the operation shaft 24b with respect to a and the actual operation position match (reference voltage level and output voltage level match). Of.

That is, the control device 27 automatically raises and lowers the seedling planting device 5 based on the float displacement information from the float sensor 24 so that the center float 16A returns to the reference posture. Is provided as a control program, and this automatic lifting control means 2
By the control operation of 7A, the seedling planting device 5 is moved up and down along the ups and downs of the field while keeping the ground height of the seedling planting device 5 at the set ground height in the seedling planting running state during seedling planting work. Therefore, the seedlings can be planted at the planting depth set by the operation lever 20 accurately and stably.

As shown in FIG. 6, the maneuvering section of the traveling machine body 1 is provided with a manually operated setting device 29 such as a potentiometer, and the setting device 29 is artificially judged to be mud in the field. By setting the operation position according to the hardness, the reference voltage level of the float sensor 24 indicating the reference attitude of the center float 16A can be changed to the voltage level according to the mud hardness of the field. The changed reference voltage level is input to the control device 27, and the control device 27 controls the electromagnetic control valve 28 so that the changed reference voltage level of the float sensor 24 matches the output voltage level. The operation is controlled to raise and lower the seedling planting device 5.

For example, when it is determined that the mud in the field is hard, the setting device 29 is set at the operation position on the "hard" side according to the hardness.
Set. Then, the operation shaft 24 with respect to the sensor body 24a for obtaining the reference voltage level according to the operation position
The reference position of b is changed to the b position direction in FIGS. 3 and 6, and the control device 27 is changed accordingly.
Controls the operation of the electromagnetic control valve 28 so that the sensor body 24
The seedling planting device 5 is lowered so that the changed reference position of the operation shaft 24b with respect to a and the actual operation position match (the changed reference voltage level and output voltage level match). By this control operation, the center float 1
The reference attitude of 6A is changed to the forward rising attitude according to the changed reference voltage level, and by changing the reference attitude, the center float 16A in the machine front-back direction is changed.
The ground contact length with respect to the mud surface of the field becomes shorter according to the changed reference voltage level, and the compression spring 30 for biasing the center float 16A toward the ground side has a relatively strong compression according to the changed reference voltage level. State (Center float 16A
The ground pressure becomes relatively large according to the changed reference voltage level), and the sensing sensitivity of the float sensor 24 is changed to the sensing sensitivity on the insensitive side according to the operating position of the setting device 29.

When it is judged that the mud in the field is soft, the setting device 29 is set at the operation position on the "soft" side according to the softness. Then, the reference position of the operation shaft 24b with respect to the sensor main body 24a for obtaining the reference voltage level according to the operation position is changed in the c position direction in FIGS. 3 and 6, and the control is performed in accordance with the change. The device 27 controls the operation of the electromagnetic control valve 28 so that the changed reference position and the actual operation position of the operation shaft 24b with respect to the sensor body 24a match (the changed reference voltage level and output voltage level match). The seedling planting device 5 is raised so as to do so. By this control operation, the reference attitude of the center float 16A is changed to the front-lowering attitude according to the changed reference voltage level, and the change of the reference attitude causes the center float 1 in the longitudinal direction of the machine body to move.
The ground length of the 6A field mud surface becomes longer according to the changed reference voltage level, and the center float 16A
The compression spring 30 for urging the force toward the ground side is in a relatively weak compression state according to the changed reference voltage level (center float 1
The ground pressure of 6A becomes relatively small according to the changed reference voltage level), and the sensing sensitivity of the float sensor 24 is changed to the sensing sensitivity on the sensitive side according to the operating position of the setting device 29. .

That is, the setting device 29 is for manually setting the reference voltage level of the float sensor 24 according to the mud hardness of the field, which is artificially determined, as the sensitivity target value. Further, the control device 27 is provided with a manual sensitivity adjusting means 27B as a control program for automatically adjusting the sensing sensitivity of the float sensor 24 to the sensitivity target value manually set by the setting device 29.

As shown in FIGS. 2 and 5 to 8, the seedling planting device 5 includes a first grounding body for converting the change in the mud surface level into vertical swing displacement by following the ground contact with the surface of the field mud. 31A,
The change of the bottom level of the groove trace is converted into a vertical swing displacement by following the ground contact with the bottom surface of the groove trace formed after the mud surface of the side floats 16B located on the left and right of the seedling planting device 5 in the leveling float 16. A pair of left and right pairs of a second grounding body 31B and a rotation sensor 31C which is a potentiometer that detects the relative swinging displacement of the grounding bodies 31A and 31B and outputs a voltage level corresponding to the relative swinging displacement. The groove trace depth detection means 31 is provided.

The structure of the groove trace depth detecting means 31 will be described in detail. The first grounding body 31A is provided between the center float 16A and the side float 16B at the swing end of the swing arm 32 that extends integrally with the float fulcrum pipe 17 extending rearward from the float fulcrum pipe 17. Is vertically pivotably supported around a horizontal axis P3 set on an extension of the rocking axis P2 of the leveling float 16. The second grounding body 31B has an axis P on the support shaft 19 of the side float 16B.
It is pivoted up and down around 2 around it. Rotation sensor 3
1C includes a sensor case 31Ca attached to a sensor case 34 pivotally supported by a pivot shaft 33 pivotally supported by a swing arm 32 about a horizontal axis P4 so as to be pivotally supported by a pivot shaft P4.
Is fixedly supported. The sensor case 34 includes a transmission shaft 35 rotatably supported by the swing arm 18 about a horizontal axis P4, and an operation arm 35a of the transmission shaft 35 and an operation arm 31Ba of the second grounding body 31B. It is interlockingly connected to the second grounding body 31B through an operation rod 36 that is installed across. On the other hand, the operation shaft 31C of the rotation sensor 31C
b and the rotary shaft 33 are linked and linked via a pickup gear 37 integrally rotatably connected to the operation shaft 31Cb, and a sector gear 38 integrally rotatably connected to the rotary shaft 33. There is. The rotating shaft 33 is interlockingly connected to the first grounding body 31A via an operating rod 39 that is laid across the operating arm 33a of the rotating shaft 33 and the operating arm 31Aa of the first grounding body 31A. That is, the first grounding body 3
By rotating the sector gear 38 around the horizontal axis P4 and rotating the pickup gear 37 in conjunction with the vertical swing around the horizontal axis P3 of 1A, the rotation sensor 31 is rotated.
The C operation shaft 31Cb is rotated according to the vertical swing displacement of the first grounding body 31A. Further, the sensor case 34 is rotated around the horizontal axis P4 in conjunction with the vertical swing of the second grounding body 31B around the horizontal axis P2, and the sensor body 31Ca of the rotation sensor 31C is moved to the horizontal axis P2.
By displacing around 4, the pickup gear 37 is rotated accordingly, the operation shaft 31Cb of the rotation sensor 31C is rotated according to the vertical swing displacement of the second grounding body 31B. ing. With the above configuration, the rotation sensor 31C can detect the relative swing displacement amount of the first grounding body 31A and the second grounding body 31B.

As shown in FIG. 6, the relative swing displacement detected by the rotation sensor 31C is converted into a voltage level corresponding to the relative swing displacement by the rotation sensor 31C, and then the groove trace depth is obtained. The groove trace depth information from the detection means 31 is output to the control device 27. The rotation sensor 31C includes a second grounding body 31B for the first grounding body 31A.
The amount of relative swing displacement downward is large (groove depth is deep)
Is configured to output a lower voltage level.
The control device 27 sequentially reads the groove trace depth information from the groove trace depth detecting means 31, sequentially calculates the moving average of the groove trace depth information, and detects the mud hardness based on the latest moving average, A sensitivity target value (reference voltage level) of the float sensor 24 is automatically selected according to the mud hardness, and the sensing sensitivity of the float sensor 24 is automatically adjusted.

For example, it is detected that the lower the moving average of the voltage level as the groove trace depth information output from the rotation sensor 31C is, the softer the mud is, and the sensitivity target value on the sensitive side according to the softness is automatically detected. In addition to the selection, the float sensor 24 is set to the automatically selected sensitivity target value on the sensitive side.
The sensing sensitivity of is automatically adjusted. Further, the higher the moving average of the voltage level output from the rotation sensor 31C is, the harder the mud is detected, and the sensitivity target value on the insensitive side is automatically selected according to the hardness, and the automatically selected insensitive The sensing sensitivity of the float sensor 24 is automatically adjusted to the side sensitivity target value.

That is, the control device 27 detects the mud hardness based on the groove trace depth information from the groove trace depth detecting means 31, and sets the sensitivity target value of the float sensor 24 according to the mud hardness. An automatic sensitivity adjusting means 27C for automatically selecting and automatically adjusting the sensing sensitivity of the float sensor 24 is provided as a control program. By the way, in the control section of the traveling machine body 1, a manually operated changeover switch 4 as shown in FIG.
0, the control device 27 sets the selector switch 40 to the "manual" position to set the manual sensitivity adjusting means 2
When the control operation by 7B is executed and the changeover switch 40 is set to the "automatic" position, the control operation by the automatic sensitivity adjusting means 27C is executed.

Next, the structure of the leveling float 16 will be described in detail.

As shown in FIGS. 2 and 3, the center float 16A has a ground leveling portion 16a formed so as to have a leveling effect on the planting points of two rows, and the ground leveling portion 16a so as to be located between the rows. And an extending portion 16b that extends rearward from the rear side to form a T shape. The distance from the support shaft 19 as the float swinging fulcrum in the extending portion 16b to the extending end is formed to be sufficiently long, and a sufficient leveling action can be obtained by the tension force of the extending portion 16b. There is.

As shown in FIGS. 2 and 5, the side float 16B has a wide ground leveling portion 16c that acts on the three-row planting areas to level the ground, and the ground leveling so as to be positioned between the rows. It is configured by a pair of left and right extending portions 16d and 16e extending in parallel rearward from the portion 16c. Of the left and right extending portions 16d and 16e, the inner extending portion 16d adjacent to the center float 16A is
Outer extending portion 16e separated from the center float 16A
The second grounding body 31B of the groove trace depth detecting means 31 is arranged immediately behind the inner extending portion 16d. As a result, damage to the groove trace depth detection means 31 due to collision with another object of the second grounding body 31B is avoided. Also, the inner extending portion 16d
Since the extension portion 16d is formed to be short, the distance from the support shaft 19 to the extension end in the extension portion 16d is reduced, and the tension force by the extension portion 16d is reduced, but the extension portion 16d is extended from the same leveling portion 16c. By forming the extended outer extending portion 16e to be long and sufficiently increasing the distance from the support shaft 19 to the extending end in the extending portion 16e, a sufficient straddling force can be obtained as the side float 16B as a whole. I am trying. That is, the side float 16B is designed to obtain a sufficient leveling action. In addition, reference numeral 41 in FIG. 2 is a soil cover plate for covering the fertilizer ditch formed by the grooving device 43 in order to feed the fertilizer from the fertilizer application device 42 into the field mud.

The left and right side floats 16B are formed in the same shape in the same mold at the time of forming, so that the manufacturing cost can be reduced. More specifically, as shown in FIGS. 9 and 10, each of the left and right side floats 16B is formed in a left-right symmetrical shape in which a pair of left and right extension portions 16d and 16e extending from the ground leveling portion 16c are elongated with the same size. To be done. Each extension 16d, 1
At a predetermined position in the extending direction of 6e, a concave portion a is formed, the bottom wall of which is in close contact with the upper wall. Then, of the pair of left and right extending portions 16d and 16e, the center float 16
By cutting the inner extending portion 16d, which is the side close to A, at the recess a, it is possible to form the left and right side floats 16B. In addition, as shown by a two-dot chain line in each of FIGS. 9 and 10, the outer extending portion 16 on the side separated from the center float 16A.
The plate 44 may be applied to the recess a of e to reinforce.

[Other Embodiments] As shown in FIG. 11, the side floats 16B are arranged so as to be located between the wide strips of the grounding portion 16c formed to have a leveling effect on the planting points for the three rows. And a pair of left and right extending portions 16d, 16e extending in parallel rearward from the ground leveling portion 16c, and the outer extending portion of the extending portions 16d, 16e that is separated from the center float 16A. The portion 16e is formed shorter than the inner extending portion 16d adjacent to the center float 16A, and the second grounding body 31B of the groove trace depth detecting means 31 is arranged immediately behind the outer extending portion 16e. You may do it. Accordingly, it is possible to eliminate the malfunction of the second grounding body 31B due to the influence of the wheel trace which may occur when the second grounding body 31B follows the ground contact with the bottom surface of the groove trace where the rear wheel 10 has passed. Therefore, the groove trace depth detection means 31 can accurately detect the groove trace depth. As shown in FIG. 12, each of the left and right side floats 16B is once formed into a left-right symmetrical shape in which a pair of left and right extending portions 16d and 16e extended from the ground leveling portion 16c have the same size and are shortened, and the side is extended. The rectangular extension floats 16f may be attached to the extension ends of the extension portions 16d and 16e via the plate 44 to form the left and right side floats 16B. The center float 16A can be used for one row to construct a seven-row planting rice transplanter.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations 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 schematic plan view of a seedling planting device.

FIG. 3 is a cross-sectional side view of the center of the lower part of the seedling planting device showing the support structure of the float sensor.

FIG. 4 is a cross-sectional front view of the lower part of the seedling planting device showing the support structure of the float sensor.

FIG. 5 is a cross-sectional side view of the lower part of the seedling planting device showing the structure of the groove mark depth detecting means.

FIG. 6 is a block diagram showing a control configuration.

FIG. 7 is a vertical cross-sectional rear view showing the configuration of groove mark depth detection means.

FIG. 8 is a vertical cross-sectional side view showing the configuration of groove trace depth detection means.

FIG. 9 is a plan view showing the configuration of a side float.

FIG. 10 is a side view showing the configuration of a side float.

FIG. 11 is a schematic plan view of a seedling planting device showing a configuration of a side float according to another embodiment.

FIG. 12 is a plan view showing the configuration of a side float according to another embodiment.

FIG. 13 is a schematic plan view of a seedling planting device showing a configuration of a side float according to a conventional technique.

[Explanation of symbols]

 1 Traveling Aircraft 5 Seedling Planting Device 16A Center Float 16B Side Float 16c Leveling Part 16d Extending Part 16e Extending Part 24 Float Sensor 27 Control Device 27A Automatic Lift Control Device 27C Automatic Sensitivity Adjusting Device 31 Groove Depth Detecting Device 31A No. One grounded body 31B Second grounded body 31C Potentiometer

Claims (2)

[Claims] 1. A seedling planting device (5) equipped with a center float (16A) and a side float (16B) for leveling, which can be vertically swung, at the rear of the traveling machine body (1) to be driven up and down. The seedling planting device (5) is automatically moved up and down during the seedling planting work based on the float displacement information from the float sensor (24) that detects the vertical swing displacement of the center float (16A). Automatic lifting control means (27A) and the side float (16B)
The mud hardness is detected based on the groove depth information from the groove depth detecting means (31) for detecting the depth of the groove formed after passing through the mud surface, and the float corresponding to the mud hardness is detected. A control device (27) equipped with an automatic sensitivity adjusting means (27C) for automatically selecting a sensitivity target value of the sensor (24) and automatically adjusting the sensing sensitivity of the float sensor (24), and A first grounding body (31A) for converting the change in the mud surface level into a vertical swing displacement by the ground trace depth detecting means (31) following the ground contact with the mud surface in the field, and the side float (1).
6B) a second grounding body (31B) for following the grounding of the bottom surface of the groove trace formed after passing through the mud surface and converting the change in the bottom level of the groove trace into vertical swing displacement, and these grounding bodies (31A),
A multi-row planting type rice transplanter configured by a potentiometer (31C) that detects a relative swing displacement amount of (31B) and outputs a voltage level corresponding to the relative swing displacement amount as groove trace depth information. Then, the side float (16B) is formed into a wide ground leveling section (16
c) and a pair of left and right extending portions (16d), (16e) extending in parallel rearward from the ground leveling portion (16c) so as to be located between the respective lines, and Of the extension parts (16d) and (16e), the inner extension part (1) adjacent to the center float (16A).
6d) is formed to be shorter than the outer extending portion (16e) separated from the center float (16A), and the second grounding body (3) is formed immediately after the inner extending portion (16d).
1B) is a multi-row planting type rice transplanter. 2. A seedling planting device (5) equipped with a center float (16A) and a side float (16B) for leveling, which can be vertically swung, at the rear part of the traveling machine body (1) so as to be driven up and down. In addition to the connection, the seedling planting device (5) is automatically moved up and down based on the float displacement information from the float sensor (24) that detects the vertical swing displacement of the center float (16A) during seedling planting work. Mud based on the groove trace depth information from the automatic elevator control means (27A) and the groove trace depth detection means (31) for detecting the groove trace depth formed after the mud surface of the side float (16B). An automatic sensitivity adjusting means (27C) for detecting hardness and automatically selecting a sensitivity target value of the float sensor (24) according to the mud hardness to automatically adjust the sensing sensitivity of the float sensor (24). When A first grounding, which is equipped with a control device (27) equipped with the device, and which uses the groove trace depth detection means (31) to convert the change in the mud surface level into a vertical swing displacement by following the ground contact with the mud surface in the field. Body (31A), the side float (1
6B) a second grounding body (31B) for following the grounding of the bottom surface of the groove trace formed after passing through the mud surface and converting the change in the bottom level of the groove trace into vertical swing displacement, and these grounding bodies (31A),
A multi-row planting type rice transplanter configured by a potentiometer (31C) that detects a relative swing displacement amount of (31B) and outputs a voltage level corresponding to the relative swing displacement amount as groove trace depth information. Then, the side float (16B) is formed into a wide ground leveling section (16
c) and a pair of left and right extending portions (16d), (16e) extending in parallel rearward from the ground leveling portion (16c) so as to be located between the respective lines, and Of the extending portions (16d) and (16e), the outer extending portion (16e) separated from the center float (16A) is an inner extending portion (16d) adjacent to the center float (16A). Shorter than that,
A multi-row planting type rice transplanter in which the second grounding body (31B) is arranged immediately after the outer extending portion (16e).