JP3573189B2 - Paddy direct sowing machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a paddy field direct sowing machine that embeds seed rice in a paddy field while traveling in a paddy field.
[0002]
[Prior art]
An example of a paddy field direct sowing machine is disclosed in Japanese Patent Application Laid-Open No. 9-28124. In this paddy field direct sowing machine, a groove maker (40, 15 in FIG. 3 and FIG. 12 of the above-mentioned publication) that forms a groove on a rice field as it progresses, and seeds are supplied to a groove formed by the groove maker. A seeding device and a soil cover (17B in FIGS. 10 and 12 of the above-mentioned publication) for backfilling the groove to which the seed rice was supplied are provided. As a result, a groove is formed on the rice field by the groove-producing device along with the progress, seed rice is supplied to this groove, and the groove is buried back by the earth covering device, so that the rice seed is buried on the rice surface.
[0003]
In this paddy field direct sowing machine, the soil covering device is supported so as to be able to swing up and down around a horizontal axis (Y in FIGS. 10 and 12 of the above-mentioned publication), and the soil covering device is urged downward by a spring, so that the seed rice can be seeded. The supplied groove is pressed from above by a soil cover, and the groove is filled back. Furthermore, a mud hardness detection unit for detecting the hardness of mud on the rice field surface is provided, and the urging force of a spring for urging the earth covering device downward is changed by the actuator according to the hardness of the mud on the rice field. (If the mud on the rice field is hard, the urging force will be stronger, and if the mud on the rice field is soft, the urging force will be weaker.)
As described above, by changing the urging force of the spring that urges the soil cover downwards depending on the hardness of the mud on the rice field, it is possible to properly bury the seed rice without moving it. are doing.
[0004]
[Problems to be solved by the invention]
In the above-mentioned paddy field direct sowing machine, the soil covering device is supported so as to be able to swing up and down around the axis of the horizontal axis, and the soil covering device is covered from above with the groove to which the seed rice is supplied. The urging force of the spring for urging the earthenware downward is changed in accordance with the strength. Thereby, regardless of the hardness of the mud on the rice field, the earthenware is in a substantially same posture, and is in a state of covering the groove to which the seed rice has been supplied from above. Further, even if the biasing force of the spring is weakened, only the state that the earthenware has easily escaped upward does not change, and the state in which the earthenware has covered the groove to which the seed rice has been supplied from above is not changed.
[0005]
Therefore, when the mud on the rice field is soft, it is necessary to sufficiently weaken the backfill by the soil cover in order to avoid the situation where the seed paddy is washed away by the mud pushing by the soil cover, whereas the above-mentioned paddy field direct seeding Even if the mud on the rice paddy is soft, the soil cover is covered with the earthen cover from the upper side in the groove to which the seeds are supplied. Therefore, there is a possibility that the seeds may be washed away by the mud pushing of the earthen cover.
It is an object of the present invention to provide a paddy field direct sowing machine equipped with a soil cover so that a groove into which seed rice is supplied can be appropriately backfilled regardless of the hardness of mud on the rice field.
[0006]
[Means for Solving the Problems]
[I]In the paddy rice field direct sowing machine according to the first aspect of the invention, a seed cultivator that forms a groove on a rice field surface as it progresses, a seeding device that supplies seed to a groove formed by the groove maker, and a seed rice that is supplied With earthenware that backfills the groove,
The earth covering device is arranged on the lateral side of the groove where the seed rice is supplied, the rear side is separated from the groove where the seed rice is supplied, the weak backfilling posture along the traveling direction, and the rear side is in the groove where the seed rice is supplied. Over a strong backfill posture approaching and obliquely intersecting the traveling direction, the earthenware is swingably supported around the front longitudinal axis,
An actuator for swinging the earthenware is provided. A mud hardness detection unit that detects the mud hardness on the rice field surface is located at a distance,
As the detection value of the mud hardness detection unit is on the hard side, it is on the strong backfilling posture side, so that the detection value of the mud hardness detection unit is on the soft side, on the weak backfilling posture side, Control means for swinging the earthenware by the actuator,
The mud hardness detection unit is rotatable about a horizontal axis, and a rotating body having a narrower width on an outer peripheral side than a width on the horizontal axis side, and a supporting unit that supports the rotating body vertically. A depth sensor that detects the depth of entry of the rotating body into the rice field, and is configured to output a detection value of the depth sensor as a detection value of the mud hardness detection unit,
When the depth of entry of the rotating body into the rice field is small based on the detection value of the depth sensor, the mud on the rice field is hard, and the depth of entry of the rotating body into the rice field is detected based on the detection value of the depth sensor. When the depth is deep, the mud on the rice field is determined to be soft.
[0007]
The invention according to claim 1 having the above structural features has the following effects.
That is, when the seed paddy is supplied to the ditch by forming a ditch in the ditch by the ditching device, when the mud on the duck is soft, where the ditch tends to collapse and the seed paddy is buried, the soil covering device is actuated by the actuator. The rocking operation is performed in the weak backfilling posture side (an intermediate posture between the weak backfilling posture and the weak backfilling posture side), and in the weak backfilling posture, the rear side of the soil cover is separated from the groove where the seed rice is supplied, and the soil is covered. The vessel is in a posture along the traveling direction.
In such a weakly backfilled posture, the earthenware is in an attitude along the traveling direction, so that the state in which the earthenware pushes mud to the groove side where the seed rice is supplied with the advance is reduced. Further, since the front side and the rear side of the earthenware are separated from the groove to which the seed rice was supplied, the seed rice was supplied even if the state where the earthenware pushed the mud to the groove side where the seed rice was supplied with the progress occurred. Mud pushed by the earthenware reaches the ditch, and there is no situation in which the seed rice is washed away.
[0008]
When the mud on the rice field is hard, it is unlikely that the groove will naturally collapse and the rice seed will be buried when the groove is formed on the rice field by the trench generator and the seed rice is supplied to the groove, but hard mud is not enough. Seed paddy is difficult to move.
in this wayWhen the mud on the rice field is hard, the actuator causes the earth covering device to swing to the strong backfilling posture side (the middle posture between the strong backfilling posture and the strong backfilling posture side), and seed rice is supplied in the strong backfilling posture. The rear side of the earthenware comes close to the groove, and the earthenware has a posture obliquely crossing the traveling direction.
In such a strong backfilling posture, by the point that the soil covering device obliquely intersects the traveling direction and the point where the rear side of the soil covering device approaches the groove to which the seed rice is supplied, The mud pushed by the earthen cover surely reaches, and the groove to which the seed rice was supplied is surely backfilled by the earthen cover.
[0009]
[II] It takes a little time from when the mud hardness detector detects the mud hardness on the rice field to when the earth covering device is actually rocked by the actuator based on the detected mud hardness on the rice field. (So-called operation delay). Therefore, when the mud hardness detection unit and the earthenware are provided at the same position, the mud hardness detection unit detects the mud hardness at a position where the rice field is located,
When the actuator attempts to swing the earth covering device based on the detection value of the mud hardness detection unit, the earth covering device has already passed the above-mentioned rice field position, and has a mud hardness different from the above-mentioned rice field position. In some cases, the position of the paddy field has been reached, and the value detected by the mud hardness detection unit does not match the posture of the earthenware.
[0010]
Structure of the invention according to claim 1According to the mud hardness detector is located at a position a predetermined distance away from the earthenware in the traveling direction front side, so the mud hardness detector detects the mud hardness at the position where the rice field is located, When the actuator tries to swing the earth covering device based on the detection value of the mud hardness detecting portion, the earth covering device reaches the above-described rice field position where the mud hardness detecting portion has detected the mud hardness. Can be set to
Thus, when the mud hardness detection unit detects the mud hardness at a position on the rice field, and the actuator attempts to swing the earth cover based on the detection value of the mud hardness detection unit, Avoiding the state that it has already passed the above-mentioned position of the rice field, based on the position of the rice field where the mud hardness detection unit has detected the hardness of the mud and the detection value of the above-mentioned mud hardness detection unit Thus, the position of the earthenware when the actuator performs the swinging operation can be matched.
[0011]
Further, when the mud hardness detection unit is constituted by a rotating body as in the configuration of the invention according to claim 1, the rotating body rotates and enters the rice field as it progresses. Since the resistance of the mud becomes strong, the depth of entry of the rotating body into the rice field becomes shallow, and if the mud on the rice field is soft, the resistance of the mud becomes weak. Become. By detecting the depth of entry of the rotating body into the rice field, it is possible to detect the hardness of the mud on the rice field.
In this case, since the rotating body is formed in a tapered shape in which the width on the outer peripheral side is smaller than the width on the horizontal axis core side, the deeper the penetration depth into the rice field, the more the rotating body near the rice field Is wider. This makes it possible for the rotating body to properly receive the resistance of the mud, especially when the rotating body penetrates deeply into the rice field in a state where the mud on the rice field is soft. A state in which the detection is made to be softer than the hardness is prevented.
In addition, even if the rotating body has penetrated deeply into the rice field, the paddy field direct sowing machine has progressed in a meandering manner, and even if a force acting to bend the rotating body from the mud on the rice field acts, such a force is not applied. The rotating body can withstand enough.
[0012]
[III] If the earthenware is configured to be continuously rocked over the weak backfill position and the strong backfill position by the detection value of the mud hardness detection unit, the mud hardness detection unit When the detected value changes, the earthenware is also immediately rocked in response to this, and the earthenware is rocked relatively frequently. As a result, there may be a case where backfill of the ditch to which the seed rice is supplied is not performed stably.
Claim 2In the paddy field direct sowing machine of the invention according to the present invention, a groove producing device that forms a groove on the rice field as it progresses, a seeding device that supplies seed rice to the groove formed by the groove producing device, a groove that is supplied with seed rice With earthenware backfilling,
The earth covering device is arranged on the lateral side of the groove where the seed rice is supplied, the rear side is separated from the groove where the seed rice is supplied, the weak backfilling posture along the traveling direction, and the rear side is in the groove where the seed rice is supplied. Over a plurality of intermediate postures between a strong backfilling posture and a weak backfilling posture and a strong backfilling posture that approach and obliquely intersect the traveling direction, the earthenware is placed around the front longitudinal axis. Swingably supported,
An actuator that swings the earthenware is provided, and a mud hardness detection unit that detects the hardness of the mud on the rice field is arranged at a position that is separated from the earthenware by a predetermined distance on the front side in the traveling direction,
A weak backfill posture and a strong backfill posture, a hardness range of a predetermined width is set corresponding to each of the plurality of intermediate postures, and when the detection value of the mud hardness detection unit is a hard side, the strong backfill posture side is set. So that the detection value of the mud hardness detection unit corresponds to the hardness range of the predetermined width to which the detection value of the mud hardness detection unit belongs so that the detection value of the mud hardness detection unit is on the soft side and on the side of the weak backfilling posture. The weak backfilling posture, the strong backfilling posture, a plurality of intermediate postures, comprising a control means for swinging the earth covering by the actuator,
The mud hardness detection unit is rotatable about a horizontal axis, and a rotating body having a narrower width on an outer peripheral side than a width on the horizontal axis side, and a supporting unit that supports the rotating body vertically. A depth sensor that detects the depth of entry of the rotating body into the rice field, and is configured to output a detection value of the depth sensor as a detection value of the mud hardness detection unit,
When the depth of entry of the rotating body into the rice field is small based on the detection value of the depth sensor, the mud on the rice field is hard, and the depth of entry of the rotating body into the rice field is detected based on the detection value of the depth sensor. When the depth is deep, the mud on the rice field is determined to be soft.
The invention according to claim 2 configured as described above has the same operation as the invention according to claim 1, and also has the following operation.
That is, according to this configurationHowever, the earthenware is not continuously rocked, but is rocked in a plurality of stages of a weak backfilling posture, a strong backfilling posture, and a plurality of intermediate postures. If the detection value of the mud hardness detection unit is within the hardness range of the predetermined width corresponding to the predetermined intermediate posture in the state where the swing operation is performed to the intermediate posture, the detection value of the mud hardness detection unit is Even if it changes, the above-mentioned earthenware is held in this predetermined intermediate position, and if the detection value of the mud hardness detection unit is out of the above-mentioned hardness range of the predetermined width, the earthenware is placed in another intermediate position. (Or a weak backfilling posture, a strong backfilling posture).
As described above, according to the second aspect of the present invention, a state in which the earthenware is frequently operated by swinging the earthenware in a plurality of stages does not occur.
[0013]
[IV] According to the feature of the third aspect, similar to the case of the second aspect, the "action" described in the above [I], [II], and [III] is provided. "Is provided.
For example, when the mud on the paddy surface is entirely soft and there is a partially hard part of the mud, when the mud hardness detection unit reaches the aforementioned partially hard mud part, the mud hardness detection unit Greatly changes, and a state occurs in which the previously covered earthenware is suddenly largely rocked.
[0014]
On the other hand, when the moving average value of the detection value of the mud hardness detection unit is used as the detection value of the mud hardness detection unit as in the feature of claim 3, the detection value of the mud hardness detection unit (moving average value) Since a large change in the height of the earthenware is suppressed, it is possible to suppress a state in which the earthenware is suddenly largely swung.
[0015]
[0016]
[0017]
[V] Claim 4According to the characteristics ofClaims 1-3As in any one of the above, [I] to[IV]And the following "action" in addition to the above.
Since it is difficult to arrange the actuator near the earthenware that has entered the rice field in the rice field direct sowing machine, the actuator is arranged in a fixed part away from the rice field, and the actuator and the earthenware are connected by a wire. In many cases, a structure in which a return spring is attached to the motor is adopted.
[0018]
in this case,Claim 4According to the feature of (1), the wire receiving portion and the return spring are attached to a supporting frame which supports the earthenware so as to be swingable and has sufficient strength. Thereby, the reaction force at the time of the pulling operation of the wire by the actuator and the reaction force of the return spring are received by the supporting frame having a sufficient strength, and are not applied to other portions.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
(1) As shown in FIG. 1, a driving seat 4 is provided at the center of a traveling body 3 supported by a pair of left and right front wheels 1 and rear wheels 2 that can be steered left and right. A 6-row type rice field direct sowing machine A is connected via a link mechanism 6 operated by a cylinder 5 to freely roll around a longitudinal axis X.
[0020]
As shown in FIGS. 1, 2, 3, and 7, the paddy direct sowing machine A has a transmission case 8 in which power is transmitted from the traveling machine body 3 via a transmission shaft 7, and three chains in which power from the transmission case 8 is transmitted. Case 9 and three leveling floats 10 arranged on the lower side of the chain case 9 are provided, and are made of a transparent resin integrally formed with a seed storage unit 11A and a fertilizer storage unit 11B (see FIGS. 4, 5, and 6). And a feeding unit 12 for feeding the seed S and the fertilizer M of the hopper 11 at the same time.
[0021]
As shown in FIGS. 2 and 3, a pair of first grooving plates 40 and a pair of second grooving plates 41 each having a triangular shape in a side view are fixed to each of the leveling floats 10, and the first grooving plate is provided. A pair of first groove-making devices 15 is fixed to the rear part of the 40, and a pair of second groove-making devices 16 are fixed to the rear part of the second groove cutting plate 41. A flexible and transparent hose 13 that guides the seed rice S from the feeding part 12 downward is connected to the first groove generator 15, and a flexible and transparent hose that guides the fertilizer M from the feeding part 12 downward. 14 is connected to the second groove generator 16.
In this case, the penetration depth of the fertilizer M into the rice field G of the second cropping device 16 is set to be deeper than the penetration depth of the seed rice S into the rice field G of the first cropping device 15, and 3 Are arranged in the horizontal direction at predetermined intervals D (for example, about 300 mm).
[0022]
As shown in FIGS. 2 and 7, the front ends of the three chain cases 9 are connected by a horizontal support frame 18, and auxiliary frames 19 are erected from both ends of the support frame 18. As shown in FIGS. 2 and 3, a horizontal pipe frame 21 is fixed to a bracket 20 at the rear end of the three chain cases 9, and the hopper 11 is supported by the pipe frame 21 via the frame 22.
[0023]
As shown in FIGS. 2 and 1, a longitudinal axis 6 is provided below the vertical link 6A of the link mechanism 6, and a screw shaft 24 is supported laterally via a support frame 23 above the vertical link 6A. A motor 25 for rotating the screw shaft 24 forward and backward is provided. A moving member 26 that is movable in the lateral direction by the rotation of the screw shaft 24 is externally fitted to the screw shaft 24, and the moving member 26 and the left and right auxiliary frames 19 are connected via a spring 27.
[0024]
As shown in FIGS. 4, 5, and 6, a partition 11 </ b> C is disposed inside the hopper 11, and a seed paddy storage unit 11 </ b> A is formed behind the partition 11 </ b> C, and a fertilizer storage unit 11 </ b> B is formed in front of the partition 11 </ b> C. Inside the case 42 in the feeding portion 12, a seed rice feeding roll 43 having a concave portion 43A formed on the outer surface and a fertilizer feeding roll 44 having a concave portion 44A formed on the outer surface are provided. And a fertilizer feeding roll 44 is supported, and a funnel-shaped guide member 46 for feeding the seed S from the seed feeding roll 43 to the hose 13, and a funnel-shaped guide member 47 for sending the fertilizer M from the fertilizer feeding roll 44 to the hose 14. Are arranged on the rear side and the front side.
[0025]
With the above structure, the seed rice and the fertilizer feeding rolls 43 and 44 are rotationally driven by the drive shaft 45 in the counterclockwise direction on the paper surface of FIGS. 4 and 5, so that the seed rice S is transferred from the seed rice storage unit 11A to the seed rice feeding roll 43 ( The fertilizer M is fed out from the fertilizer storage unit 11B to the guide member 47 by the fertilizer feeding roll 44 (concave portion 44A) through the recess 43A).
[0026]
As shown in FIGS. 2 and 3, the drive shaft 45 is disposed so as to penetrate the adjacent feeding portion 12 in the lateral direction so as to be able to simultaneously drive two lines. A one-way clutch 48 is provided. A pair of crank arms 49 provided on the left and right sides of the rear portion of the chain case 9 and an operation arm 48A of the one-way clutch 48 are connected via a rod 50. The push-pull operation is converted into rotational motion by the one-way clutch 48 and transmitted to the drive shaft 45. In this case, the phase difference between the pair of crank arms 49 is set to 180 degrees so that the drive shaft 45 rotates smoothly, and the drive shaft 45 is always rotated by one of the crank arms 49. ing.
[0027]
(2) Next, the configuration of the first and second earthenware 37, 38 provided in the leveling float 10 will be described.
As shown in FIGS. 8, 9, and 10, in the leveling float 10, a pair of left and right second earth covering devices 38, each of which has a plate material directed obliquely, is fixed inside the rear of the second groove forming device 16. The support frame 31 is fixed to both left and right ends of the leveling float 10, and the operation shaft 39 is rotatably supported on the left and right ends of the support frame 31, and the first earthenware 37 having a plate material obliquely directed. Is fixed to the lower end of the operation shaft 39, and the first earthenware 37 is positioned rearward and outside of the first groove making device 15.
[0028]
As shown in FIGS. 2, 3, and 13, an operation shaft 53 is rotatably supported on the pipe frame 20, and an operation cylinder 56 is connected to an arm 55 fixed to the operation shaft 53. Thus, the angle of the operation shaft 53 can be changed. Six arms 57 are fixed to the operation shaft 53, and the arm 57 and the operation arm 39 a of the operation shaft 39 are connected by wires 51.
In this case, as shown in FIGS. 8, 9, and 10, the support member 68 is fixed to the support frame 31, the outer end 51a of the wire 51 is fixed to the support member 68, and the operation arm 39a and the support member 68 ( A return spring 54 that generates a tensile force is provided across the support frame 31).
[0029]
With the above structure, as shown in FIG. 9, the first earthenware 37 is urged by the return spring 54 toward the weak backfilling posture R <b> 1 along the front-rear direction (the traveling direction of the traveling body 3) of the leveling float 10. By pulling the wire 51, the first earthenware 37 is swung toward the strong back-filling posture R5 (the plurality of intermediate postures 2, R3, R4) facing inward against the return spring 54.
[0030]
(3) Next, the configuration of the raising and lowering control and the configuration of the rolling control of the rice field direct sowing machine A will be described.
As shown in FIGS. 2 and 3, a support arm 30 extends rearward from a support shaft 29 rotatably supported on the lower surface of the chain case 9, and extends around a horizontal axis P1 at the rear end of the support arm 30. The rear of the leveling float 10 is supported so as to be able to swing up and down.
As a result, the rear part (or the entirety) of the leveling float 10 moves up and down independently by swinging the support arm 30 up and down, and the front part of the leveling float 10 moves independently around the horizontal axis P1. Move up and down.
[0031]
As shown in FIGS. 2 and 13, the front portion of the leveling float 10 and the support frame 18 are connected via a bendable link 32. A potentiometer 35 is fixed to the left and right center front portions of the support frame 18, and a detection arm 34 of the potentiometer 35 and a front portion of the center leveling float 10 are connected via a link rod 33. A spring 17 is provided for urging the front part of the center leveling float 10 downward via a rod 33.
[0032]
As shown in FIG. 13, the detection value of the potentiometer 35 of the center leveling float 10 is input to the control device 36, and the detection value of the potentiometer 35 is the same as that of the front part of the center leveling float 10 and the rice field direct sowing machine A (potentiometer A). 35). As shown in FIG. 7, the auxiliary frame 19 is provided with a double-tilt type inclination sensor 28 for detecting the left and right inclination angles of the rice field direct sowing machine A with respect to the horizontal plane, and the detected value of the inclination sensor 28 is input to the control device 36. Have been.
[0033]
Accordingly, when the paddy field direct sowing machine A moves up and down while the center leveling float 10 follows the ground surface G as the traveling body 3 advances, the front of the center leveling float 10 around the horizontal axis P1 The control device 36 operates the control valve 52 so that the detection value of the potentiometer 35 becomes the set value C (so that the detection arm 34 of the potentiometer 35 is in the posture of the set value C) because of the vertical movement. Is operated so that the paddy field direct sowing machine A is automatically moved up and down.
At the same time, based on the detection value of the inclination sensor 28, the moving member 26 shown in FIG. Rolling operation is performed around the front-rear axis X.
[0034]
Thereby, a groove is formed on the rice field surface G by the first grooving plate 40 and the first grooving device 15, the second grooving plate 41, and the second grooving device 16 as the traveling machine 3 advances, and the seeds of the hopper 11 are seeded. The seed paddy S and the fertilizer M in the storage unit 11A and the fertilizer storage unit 11B are simply fed out by the seed paddy and fertilizer feeding rolls 43 and 44, and the hose 13, the first channel generator 15, the hose 14, and the second channel. It is supplied to each groove via the vessel 16, the groove supplied with the seed rice S is backfilled by the first soil cover 37, and the groove supplied with the fertilizer M is backfilled by the second cover 38. .
[0035]
At the same time, as described above, the paddy field direct sowing machine A is automatically moved up and down and the rolling operation is performed, the paddy field direct sowing machine A is maintained at a set height from the rice field G and is maintained horizontally, and the first grooved plate 40 and The depth of the groove formed on the rice field surface G by the first groove making device 15 and the depth of the groove formed by the second groove cutting plate 41 and the second groove making device 16 on the rice field G are maintained at the set depth. .
[0036]
(4) Next, the configuration of the mud hardness detection unit 64 provided in the paddy field direct sowing machine A will be described.
As shown in FIGS. 1 and 12, the first support frame 65 extends from the left and right center of the support frame 18 to the front in the traveling direction of the traveling machine body 3, and the second support frame 66 is inclined at the tip of the first support frame 65. The second support frame 66 is provided with a mud hardness detection unit 64 so as to be adjustable in height in the direction.
[0037]
As shown in FIGS. 11 and 12, a first arm 67 is supported around the horizontal axis P2 at the end of the second support frame 66 so as to be vertically swingable, and has a ground-shaped surface having a predetermined width. The first rotating body 58 is freely rotatably supported around the horizontal axis at the tip of the first arm 67. A support plate 67a that swings integrally with the first arm 67 is provided, and a stopper 59 that determines the lower limit position of the first arm 67 by contacting the second support arm 66, and a potentiometer 60 are attached to the support plate 67a. Provided.
[0038]
The second arm 61 is supported so as to be vertically swingable around a horizontal axis P2 at the tip of the second support frame 66, and the second rotating body 62 is freely rotatable around the horizontal axis at the tip of the second arm 61. The second rotating body 62 is formed in the shape of a solovan ball in which the lateral width on the outer peripheral side is narrower than the lateral width on the horizontal axis side of the tip of the second arm 61.
A detection arm 61a swinging integrally with the second arm 61 is provided, and the detection arm 61a contacts the roller 60b of the detection arm 60a of the potentiometer 60 so that the detection arm 61a does not separate from the roller 60b. An L-shaped member 60c is provided on the detection arm 60a. A pair of bolts 63 for determining the swing range of the second arm 61 with respect to the first arm 67 is provided on the support plate 67 a, and by changing the position of the bolt 63, the second arm 61 with respect to the first arm 67 is changed. The swing range can be adjusted large or small.
[0039]
With the above configuration, as shown in FIG. 12, the first and second rotating bodies 58 and 62 are going to descend by their own weight, and since the first rotating body 58 is in the form of a drum, it rolls and follows the rice field surface G in contact with the ground. However, it does not enter the rice field G regardless of the hardness of the mud on the rice field G. On the other hand, the Soloban ball-shaped second rotating body 62 tries to enter the rice field G by its own weight while rotating. When the mud on the rice field G is soft, the depth of entry of the second rotating body 62 into the rice field G becomes deep. Therefore, the detection value of the potentiometer 60 is the depth of entry of the second rotating body 62 into the rice field G, and is the mud hardness of the rice field G.
[0040]
(5) Next, when the mud hardness detection unit 64 described in (4) above detects the mud hardness of the rice field G, the paddy field direct sowing machine A performs based on the mud hardness of the rice field G. The automatic change of the control sensitivity of the elevation control will be described.
As described in (4) above, when the detection value of the mud hardness detection unit 64 (potentiometer 60) is on the hard side, the set value C shown in FIG. Is automatically changed to As a result, the rice seedling direct sowing machine A is automatically moved up and down so that the detection value of the potentiometer 35 becomes the upward set value C (the detection arm 34 of the potentiometer 35 becomes the attitude of the upward set value C). You.
[0041]
Since the attitude of the center leveling float 10 at the upward set value C is on the front ascending side, the ground contact area of the center leveling float 10 on the rice field surface G is reduced, and the spring 17 is compressed and the urging force of the spring 17 is reduced. Can be strengthened. Therefore, the sensitivity of the center leveling float 10 to follow the ground surface G on the rice field surface G (the control sensitivity of the elevation control) is changed to the insensitive side.
[0042]
Conversely, if the detection value of the mud hardness detection unit 64 (potentiometer 60) is on the soft side, the set value C shown in FIG. 13 is automatically changed to the downward sensitive side according to the mud hardness. . As a result, the rice seedling direct sowing machine A is automatically moved up and down so that the detection value of the potentiometer 35 becomes the downward set value C (so that the detection arm 34 of the potentiometer 35 becomes the attitude of the downward set value C). You.
[0043]
Since the attitude of the center leveling float 10 at the downward set value C is on the front downward side, the contact area of the center leveling float 10 on the rice field surface G increases, the spring 17 expands, and the urging force of the spring 17 decreases. Can be weakened. Accordingly, the ground following sensitivity of the center leveling float 10 to the rice field surface G (the control sensitivity of the elevation control) is changed to the sensitive side.
[0044]
(6) Next, the automatic rocking operation of the first earthenware 37 when the mud hardness of the rice field G is detected by the mud hardness detection unit 64 described in (4) of FIG. This will be described with reference to FIG.
As shown in FIG. 9, in the first earthenware 37, the rear side of the first earthenware 37 is separated from the groove to which the seed rice S is supplied, and the first earthenware 37 is weakly buried along the traveling direction of the traveling body 3. The back side of the first earthenware 37 approaches (covers) the groove to which the return posture R1 and the seed rice S are supplied, and the first earthenware 37 is strongly backfilled obliquely intersecting the traveling direction of the traveling body 3. The posture R5 is set, and a plurality of intermediate postures R2, R3, R4 are set between the weak backfilling posture R1 and the strong backfilling posture R5.
[0045]
The detection value of the mud hardness detection unit 64 (potentiometer 60) is input to the control device 36 at every set time T (for example, 50 msec) (Steps S1, S2, S3), and the mud hardness detection unit 64 (potentiometer 60) Every time the detection value of (60) is input, a moving average value D of the stored set number B (for example, 10) of detected values is calculated (step S4) (the set number B of mud hardness detection units). When a new detection value of the mud hardness detection unit 64 is input in a state where the detection values of 64 are stored, the oldest one of the detection values of the set number B of the mud hardness detection units 64 is deleted, and the remaining one is deleted. The average value is calculated based on the detection value of the mud hardness detection unit 64 and the detection value of the new mud hardness detection unit 64).
[0046]
A hardness range having a predetermined width is set for each of the weak backfill posture R1, the strong backfill posture R5, and the plurality of intermediate postures R2, R3, and R4. In this case, based on the hardness setting values S1, S2, S3, S4, S5 ((soft) S1 <S2 <S3 <S4 <S5 (hard)), D <S1, S1 ≦ D <S2, S2 ≦ A plurality of hardness ranges having a predetermined width of D <S3, S3 ≦ D <S4, S4 ≦ D are set. As shown in FIG. 9, D <S1 and a weak back-filling posture R1, S1 ≦ D <S2 And the middle posture R2, S2 ≦ D <S3, the middle posture R3, S3 ≦ D <S4, the middle posture R4, S4 ≦ D, and the strong backfilling posture R5.
[0047]
When the moving average value D is calculated in step S4, it is determined which of the plurality of predetermined width hardness ranges the predetermined average width of the moving average value D falls in (step S5). The weak backfill posture R1 and the strong backfill posture R5 and the plurality of intermediate postures R2, R3, R4 corresponding to the hardness range of a predetermined width in which the moving average value D falls are set as the target postures (steps S6, S7, S7). S8, S9, S10).
Thereby, the operation cylinder 56 is extended and contracted so that the first earthenware 37 becomes the set target posture (the weak backfill posture R1 and the strong backfill posture R5, and the plurality of intermediate postures R2, R3, R4). The first earthenware 37 is rocked by the wire 51 and the return spring 54.
[0048]
In this case, if the mud on the rice field G is soft, the first earthenware 37 is rocked to the weakly backfilling posture R1 and the intermediate postures R2 and R3 on the weakly backfilling posture R1 side, and the mud on the rice field G is hard. Then, the first earthenware 37 is rocked to the strong backfilling posture R5 and the intermediate postures R4 and R3 on the strong backfilling posture R5 side.
[0049]
【The invention's effect】
According to the features of Claims 1 and 2, in the paddy field direct sowing machine equipped with the earth covering device, based on the hardness of the mud on the rice field, the back side of the earth covering material is separated from the groove, and the weak back-filling posture along the traveling direction, and The rocking operation is automatically performed in a strong backfilling posture (weak backfilling posture, strong backfilling posture, and multiple intermediate postures) in which the side approaches the groove and crosses the traveling direction diagonally. By configuring, the seed rice could be properly buried without moving, and the seeding performance of the paddy field direct sowing machine was improved, thereby improving the germination rate.
[0050]
By disposing the mud hardness detection unit at a position a predetermined distance away from the earth covering device in the traveling direction in consideration of the operation delay as in claims 1 and 2, the mud hardness detection unit can detect the mud hardness. And the position of the earthenware when the actuator performs the swinging operation based on the detection value of the above-described mud hardness detection unit can be made to coincide with each other. The posture can be accurately set to an appropriate one according to the hardness of the mud on the rice field, and the seeding performance of the rice field direct sowing machine can be further improved.
Further, by configuring the mud hardness detection unit with the rotating body as in claims 1 and 2, especially when the mud on the rice field is soft, the rotating body enters too much on the rice field and the actual mud on the rice field is removed. It is now possible to appropriately detect the hardness of mud on the rice field while preventing the state where it is detected as being softer than the hardness, and further improve the sowing performance of the rice field direct sowing machine. Was. Moreover, even if the paddy rice field sowing machine advances in a meandering manner with the rotating body deeply penetrating the rice field, the rotating body is not bent, which is advantageous in terms of durability.
[0051]
The earthenware is frequently swung by the swinging operation of the earthenware in a plurality of stages of a weak backfilling posture, a strong backfilling posture, and a plurality of intermediate postures. Since the state of being operated can be suppressed, the seed rice can be properly buried without further moving, and the sowing performance of the rice field direct sowing machine can be further improved.
[0052]
According to the feature of the third aspect, the "effect of the invention" of the second aspect is provided similarly to the case of the second aspect. In addition to the "effect of the invention", the following "effect of the invention" is provided. It has.
As described in the third aspect, the moving average value of the detection value of the mud hardness detection unit is used as the detection value of the mud hardness detection unit, and the detection value (moving average value) of the mud hardness detection unit is large. By suppressing the change, it is possible to suppress a state in which the earthenware is suddenly largely swung, so that the features of the second and third aspects are combined, and the smooth and stable swinging of the earthenware is performed. The moving operation can be performed, and the seed rice can be properly buried without further moving, so that the seeding performance of the rice field direct sowing machine can be further improved.
[0053]
[0054]
Claim 4According to the characteristics ofClaims 1-3As in any one of the aboveClaims 1-3The present invention has any one of the “effects of the invention”, and has the following “effects of the invention” in addition to the “effects of the invention”.
Claim 4By attaching the wire receiving portion and the return spring to the support frame that supports the earthenware so that it can swing freely and has sufficient strength, the reaction force and return when the actuator pulls the wire Since the reaction force of the spring can be configured so as not to be applied to other parts other than the support frame, deformation of other parts can be prevented beforehand, and the durability of the rice field direct sowing machine is improved. I was able to.
[Brief description of the drawings]
FIG. 1 is an overall side view of a rice field direct sowing machine connected to a traveling machine body.
FIG. 2 is an overall plan view of a rice field direct sowing machine.
FIG. 3 is a rear view of a rice field direct sowing machine.
FIG. 4 is a vertical sectional side view of a hopper and a feed portion of a paddy field direct sowing machine near a seed roll.
FIG. 5 is a side view of a vertical section near a fertilizer feeding roll in a hopper and a feeding section of a paddy field direct sowing machine.
FIG. 6 is a cross-sectional plan view of a hopper of a rice field direct sowing machine.
FIG. 7 is an overall front view of a rice field direct sowing machine.
FIG. 8 is a perspective view of the vicinity of the rear part of the leveling float.
FIG. 9 is a plan view near the rear of the leveling float.
FIG. 10 is a rear view showing the vicinity of the rear part of the leveling float.
FIG. 11 is a cross-sectional plan view of a mud hardness detection unit.
FIG. 12 is a side view of a mud hardness detection unit.
FIG. 13 is a system diagram showing a linked state of the leveling float and the first earthenware.
FIG. 14 is a diagram showing a control flow of a swing operation of the first earthenware.
[Explanation of symbols]
12 Seeding equipment
15 Groove device
31 Support frame
37 earthenware
39 vertical axis
51 wires
54 Return spring
56 Actuator
60 depth sensor
61 Support
62 rotating body
64 Mud hardness detector
68 Receiving part
D Moving average
R1 Weak backfill posture
R2, R3, R4 Multiple intermediate positions
R5 Strong backfill posture
S seed paddy
G rice field

Claims (4)

A groove generator that forms a groove on the rice field with progress, a seeding device that supplies seed rice to the groove formed by the groove generator, and a soil covering device that refills the groove where the seed rice was supplied,
The earth covering device is arranged on the lateral side of the groove where the seed rice is supplied, the rear side is separated from the groove where the seed rice is supplied, the weak backfilling posture along the traveling direction, and the rear side is in the groove where the seed rice is supplied. Over a strong back-filling posture approaching and obliquely intersecting the traveling direction, the earthenware is swingably supported around the front longitudinal axis,
An actuator for swinging the earthenware is provided, and a mud hardness detection unit for detecting the hardness of the mud on the rice field is arranged at a position away from the earthenware by a predetermined distance on the front side in the traveling direction,
As the detection value of the mud hardness detection unit is on the hard side, it is on the strong backfilling posture side, so that the detection value of the mud hardness detection unit is on the soft side, on the weak backfilling posture side, Control means for swinging the earthenware by the actuator,
The mud hardness detection unit is rotatable about a horizontal axis, and a rotating body having a narrower width on an outer peripheral side than a width on the horizontal axis side, and a supporting unit that supports the rotating body vertically. A depth sensor that detects the depth of entry of the rotating body into the rice field, and is configured to output a detection value of the depth sensor as a detection value of the mud hardness detection unit,
When the depth of entry of the rotating body into the rice field is small based on the detection value of the depth sensor, the mud on the rice field is hard, and the depth of entry of the rotating body into the rice field is detected based on the detection value of the depth sensor. Paddy field direct sowing machine that is configured to judge that the mud on the rice field is soft when the depth is deep . A groove generator that forms a groove on the rice field with progress, a seeding device that supplies seed rice to the groove formed by the groove generator, and a soil covering device that refills the groove where the seed rice was supplied,
The earth covering device is arranged on the lateral side of the groove where the seed rice is supplied, the rear side is separated from the groove where the seed rice is supplied, the weak backfilling posture along the traveling direction, and the rear side is in the groove where the seed rice is supplied. Over a plurality of intermediate postures between a strong backfilling posture and a weak backfilling posture and a strong backfilling posture that approach and obliquely intersect the traveling direction, the earthenware is placed around the front longitudinal axis. Swingably supported,
An actuator for swinging the earthenware is provided, and a mud hardness detection unit for detecting the hardness of the mud on the rice field is arranged at a position away from the earthenware by a predetermined distance on the front side in the traveling direction,
A weak backfill posture and a strong backfill posture, a hardness range of a predetermined width is set corresponding to each of the plurality of intermediate postures, and when the detection value of the mud hardness detection unit is a hard side, the strong backfill posture side is set. So that the detection value of the mud hardness detection unit corresponds to the hardness range of the predetermined width to which the detection value of the mud hardness detection unit belongs so that the detection value of the mud hardness detection unit is on the soft side and on the side of the weak backfilling posture. The weak backfilling posture, the strong backfilling posture, a plurality of intermediate postures, provided with control means for swinging the earthenware by the actuator,
The mud hardness detection unit is rotatable about a horizontal axis, and a rotating body having a narrower width on an outer peripheral side than a width on the horizontal axis side, and a supporting unit that supports the rotating body vertically. A depth sensor that detects the depth of entry of the rotating body into the rice field, and is configured to output a detection value of the depth sensor as a detection value of the mud hardness detection unit,
When the depth of entry of the rotating body into the rice field is small based on the detection value of the depth sensor, the mud on the rice field is hard, and the depth of entry of the rotating body into the rice field is detected based on the detection value of the depth sensor. Paddy field direct sowing machine that is configured to judge that the mud on the rice field is soft when the depth is deep . The paddy field direct sowing machine according to claim 2, wherein the control means is configured to operate a moving average value of the detection value of the mud hardness detection unit as a detection value of the mud hardness detection unit. The earthenware is swingably supported on a fixed support frame around a front longitudinal axis, and the actuator and the earthenware are connected via a wire, and a receiving portion of the wire is fixed to the support frame. Along with
The paddy field direct sowing machine according to any one of claims 1 to 3 , wherein a return spring acting in a direction opposite to the pulling direction of the wire is provided over the earthenware and the support frame.

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