JP2008099586A - Seedling transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a soil preparation rotor as a detection means for detecting the hardness of soil besides the essential soil preparation function of the soil preparation rotor although a conventionally known seedling transplanter has a constitution that the soil preparation rotor pivotally mounted on the front side of a float is forcedly rotated and driven to perform a soil preparation action, however, actions except the soil preparation action are not expected. <P>SOLUTION: The seedling transplanter has a constitution that a seedling planting device equipped with a control means (4) is connected to the rear part of a traveling body and a lifting and lowering control action for retaining a planting depth at a set position based on the detected value of a ground sensor (5). An independently and vertically movable central soil preparation operation device (7) is provided in front of a center float (6) provided on the lower side of the seedling planting device and the control means (4) corrects the sensitivity of a lifting and lowering control based on the hardness of soil detected by the vertical movement of the central soil preparation operation device (7). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seedling transplanting machine equipped with a leveling work device for leveling a field scene devastated by wheels on the front side of a float.

  Conventionally, a seedling transplanting machine equipped with this type of bracing apparatus is already known as a known working machine. As an example, it is possible to replace the unscratched part of the surface soil of the cultivated field in a state without unevenness and in a good growth condition of the crop, and planting at the same time as this scraping In addition, there has been disclosed a treatment device for a simultaneous treatment planting machine that does not push down a seedling that has already been planted while satisfactorily detecting ground pressure with an intermediate float.

The above disclosed technique is described in the following Japanese Patent Application Laid-Open No. 6-125617 (see Patent Document 1) published before the present application together with the drawings. That is, a planting device having a plurality of planting bodies and a float that slides on a farm scene is arranged at the rear of the traveling wheel, and three cutting rotors that are forcibly driven to rotate at the front of the planting device Is disclosed in a co-planting machine in a co-planting machine in which the intermediate co-rotating rotors are arranged in front of the both sides.
JP-A-6-125617

  In this type of conventional apparatus, as shown in Patent Document 1 described above, a forcible rotor serving as a leveling rotor is pivotally mounted at a front position of a float disposed on the front side of each planting apparatus and is forcibly rotated. Although it is configured, this leveling rotor has a problem in that it is not devised to use other than just the function of scraping the surface soil of the field.

  The invention of the present application is equipped with a lifting control device in order to keep the planting depth of the seedling planted by the seedling planting device always optimal, but in addition to the original leveling function to the leveling rotor, As a configuration that can be used as detection means for detecting the degree, and that a detection signal can be input to the lift control means, the control is corrected so that the lift control action of the seedling planting device can be matched to the hardness of the soil. This is the issue.

  In order to solve the above-mentioned problem, the invention described in claim 1 is provided with a seedling planting device (3) that is moved up and down by a lifting link device (2) at the rear of the traveling vehicle body (1), and a ground contact sensor. In the seedling transplanting machine provided with the control means (4) for controlling the raising and lowering of the seedling planting device (3) in order to maintain the planting depth at the set position based on the detection value of (5), the seedling planting device In (3), a central leveling work device (7) is disposed on the front side of the center float (6) provided on the lower side, and a left and right leveling work device (9) is disposed on the front side of the left and right side floats (8). A transmission mechanism (10) is provided to transmit to the central leveling work device (7) and the left and right leveling work device (9), and the central leveling work device (7) and the left and right leveling work device (9) are provided as seedling planting devices. (3) Provided to be adjustable up and down, center leveling The device (7) is provided so as to be able to move up and down independently with respect to the left and right leveling work device (9), and the control means (4) detects the soil detected by the vertical movement of the central leveling work device (7). The seedling transplanter is configured to correct the sensitivity of the raising / lowering control of the seedling planting device (3) based on the softness of the seedling, and performs the raising / lowering control according to the softness of the soil in the field.

  That is, although the raising / lowering control apparatus (control means (4)) employ | adopts the structure controlled based on the detection of a ground sensor (5), when the reaction at the time of the detection of a ground sensor (5) is a hard soil, In the case of soft soil, even if the depth of the top soil is the same, the detected value is different, and in the hard soil, the ground sensor (5) receives a strong ground pressure from the top soil surface, and conversely, it is soft. Differences from weak ground pressure due to soil occur. Therefore, the invention of claim 1 detects in advance the vertical movement of the central leveling device (7) and inputs it to the control means (4), and the control means (4) detects the input vertical movement on the topsoil surface. The softening and softening is replaced with the lifting control, and the lifting control is performed according to the soil of each field, so that the seedling planting depth by the seedling planting device (3) is always maintained at an appropriate height. Is.

  Next, the invention described in claim 2 is the seedling transplanter according to claim 1, wherein a center float (6) having a central leveling device (7) disposed on the front side is used as the ground sensor (5). The center float (6) disposed immediately behind the center leveling device (7) for detecting the softness of the topsoil can be used as the ground sensor (5) to improve the accuracy of the lifting control.

  First, the invention described in claim 1 employs a configuration that controls the lifting control action by the control means (4) based on the detection of the ground sensor (5). In the case of hard soil and soft soil, the grounding sensor (5) receives a strong ground pressure from the topsoil surface in the hard soil, even if the soil depth is about the same. A difference in the detected value occurs due to a difference from a weak ground pressure due to soft soil.

  Therefore, in the invention of claim 1, the vertical movement of the central leveling device (7) is detected in advance and inputted to the control means (4), and the control means (4) sends the detected information to the surface soil surface. There is an effect of performing accurate elevation control in accordance with the hardness of the soil in the field by performing the calculation in place of the hardness and correcting the elevation control.

  Thus, the seedling planting device (3) of the present invention does not depend on the soil softness that is different for each field or even within the same field, and always determines the seedling planting depth. It can be kept at the set height.

  The invention described in claim 2 has, in addition to the effect of the invention described in claim 1, a center float (6) disposed immediately behind the central leveling device (7) for detecting the softness of the topsoil. By using the ground contact sensor (5), the ground pressure can be detected immediately after the soil surface where the softness is detected, so the correction of the lift control and the ground pressure are accurately related to greatly increase the accuracy of the lift control action. Can be increased.

Embodiments of the present invention will be specifically described below with reference to the drawings.
First, as shown in FIGS. 3 to 5, the seedling planting device 3 is mounted on the rear portion of the traveling vehicle body 1 by a lifting link device 2 so as to freely move up and down, thereby constituting a riding type rice transplanter.

  The traveling vehicle body 1 is a four-wheel drive vehicle including a pair of left and right front wheels 15 and 15 and a pair of left and right rear wheels 16 and 16 as drive wheels, and a transmission case 17 is disposed at the front of the fuselage. Front wheel final cases 18 and 18 are provided on the left and right sides of the transmission case 17, and the left and right front wheel axles projecting outward from the respective front wheel support portions capable of changing the steering direction of the left and right final cases 18 and 18. The left and right front wheels 15, 15 are pivoted. The front end portion of the main frame 19 is fixed to the rear portion of the transmission case 17, and a rear wheel gear case 20 is supported by a rear wheel rolling shaft provided horizontally in the front and rear at the center of the rear end of the main frame 19. The rear wheels 16 and 16 are mounted on a rear axle that protrudes outward from the rear axle 20.

In addition, 16a and 16a shown in FIG. 7 are auxiliary wheels mounted inside the left and right rear wheels 16 and 16.
Next, as shown in FIG. 3, the engine 21 is mounted on the main frame 19, and the rotational power of the engine 21 is transmitted to the transmission case 17 via the belt transmission device 22 and the HST 23. It is assumed to be configured. The rotational power input to the mission case 17 is shifted by the transmission in the case and then branched into the traveling power and the external extraction power. A part of the traveling power is transmitted to the front wheel final cases 18 and 18 to drive the front wheels 15 and 15, and the rest is transmitted to the rear wheel gear cases 20 and 20 to drive the rear wheels 16 and 16. It has a structure that distributes power.

Further, the external take-out power is transmitted to a planting clutch case 24 provided at the rear portion of the traveling vehicle body 1 and then transmitted to the seedling planting device 3 by a planting transmission shaft 25.
The control seat 26 is installed on the upper side of the engine cover 27 that covers the upper side of the engine 21, a front cover 28 having various operation mechanisms is disposed on the front side, and a steering handle 30 is provided on the upper position. It is composed. Reference numeral 31 denotes a floor step, and 32 denotes a rear wheel fender.

Further, on both the left and right sides of the front part of the traveling vehicle body 1, the spare seedling platforms 33, 33 on which the supplementary seedlings for replenishment are placed can be pivoted to a position where they are extended laterally from the machine body and to a position where they are stored inside. It is composed.
The lifting link device 2 already described is configured as a parallel link mechanism with upper and lower links 34 and 35 as shown in FIGS. 3 and 5, and the rear side is erected on the rear end of the main frame 19. It is configured such that it is attached to a optic portal link base frame 36 so as to freely rotate up and down, and its tip is connected to a vertical link 37. The seedling planting device 3 is configured to be connected so as to be capable of rolling operation around a connecting shaft 38 that is rotatably inserted and connected to the lower end portion of the vertical link 37.

  As shown in FIG. 3, the seedling planting device 3 is provided with the piston side of the lifting hydraulic cylinder 40 provided at the rear portion of the traveling vehicle body 1 connected to the lifting link device 2, and detailed illustration is omitted. With this expansion and contraction operation, it is configured to move up and down while maintaining a substantially constant posture.

  Next, as shown in FIGS. 3 and 4, the seedling planting device 3 has a six-row planting structure, a transmission case 41 that also serves as a frame, a mat seedling, and a left and right reciprocating movement so that a single seedling is obtained. The seedlings are fed to the seedling take-out outlets 42 of the individual strips, and the seedling feed belt 43 that feeds the seedlings for one horizontal row to all the seedling take-out outlets 42 is used to transfer the seedlings downward and to the seedling take-out outlets 42. It is equipped with a planting basket 45 or the like for planting the supplied seedlings in the field.

  As shown in FIGS. 5 and 7, the seedling planting device 3 is provided with a center float 6 disposed at the lower center position and side floats 8 and 8 disposed on the left and right sides thereof. It is structured to level the field just before planting while sliding as it advances. Each float 6, 8, 8 is pivotally supported at the rear so that the front end side can move up and down according to the unevenness of the field topsoil surface. In particular, the center float 6 is shown in the block diagram of FIG. 1. As shown in FIG. 4, the ground sensor 5 also serves as a configuration that can detect the angle of attack of the front part and move it to the control means 4 (referred to as “controller 4” in the embodiment) as detection information.

  Then, the controller 4 performs a comparison operation with a reference value stored in advance based on detection information input from the ground sensor 5 (the center float 6), and an actuator (not shown) on the lifting hydraulic cylinder 40 side. However, the planting depth of the seedlings is always maintained constant while the control signal is output to the oil path switching valve) and the seedling planting device 3 is controlled to move up and down.

  The seedling planting device 3 is provided with three leveling devices 7, 9, and 9 for leveling and leveling the rough soil in the rough farm field. As shown in FIG. The work device 7 is axially positioned, and the left and right leveling work devices 9 and 9 are axially positioned on the front side of the left and right side floats 8 and 8. In addition, each said leveling work apparatus 7,9,9 becomes a structure similar to the well-known scraper rotor, and is set as the structure which leveles the topsoil by driving rotation.

Next, a support structure for the above three leveling devices 7, 9, 9 will be described.
First, as shown in FIG. 6, it pivots to the distal ends of left and right arms 47, 47 each having a base secured to a support frame body 46 (a lateral support rod spanned between the left and right support columns 29, 29). A beam member 48 that is freely supported, left and right support arms 49 and 49 fixed to both ends, and left and right leveling work device support frames 50 and 50 that are rotatably attached to the support arms 49 and 49, respectively, are provided. As shown in FIG. 5, left and right connecting members 51, 51 whose bases are rotatably attached to the transmission case 41 are connected near the lower ends of the left and right leveling work device support frames 50, 50.

  And the part (bearing part) where the lower ends of the left and right leveling work device support frames 50 and 50 rotatably support the left and right leveling work devices 9 and 9 is located at the center position of the body rather than the left and right center lines of the left and right rear wheels 16 and 16. The mud surface that has been disturbed by the left and right rear wheels 16 and 16 is satisfactorily leveled by the left and right leveling work devices 9 and 9, and an appropriate seedling transplanting action is performed. It is configured.

  As shown in FIG. 7, the left and right leveling work devices 9 and 9 are arranged with left and right chain cases 53 and 53 corresponding to the transmission mechanism 10 from the inside of the drive shafts 52 and 52 toward the front of the machine body. A drive shaft 55 of the central leveling device 7 is pivotally supported between the cases 53 and 53.

  Then, as shown in FIG. 7, the transmission mechanism 10 transmits power from the gears in the gear cases 20 and 20 of the rear wheels 16 and 16 to the drive shaft 52 of the left leveling work device 9 via the transmission universal joint 56. The left drive shaft 52 is transmitted to the drive shaft 55 of the central leveling work device 7 by the chain in the left chain case 53, and the right leveling work device is further transmitted from the right end of the drive shaft 55 to the drive shaft 55 in the right chain case 53. Nine drive shafts 52 are configured to transmit power.

  Then, as shown in FIG. 6, the center leveling work device 7 rotatably connects a support member 59 in the vertical direction to the tip of the link member 58 having a base fixed to a substantially intermediate portion of the beam member 48. As shown in FIG. 5, the lower end portion of the spring 61 whose upper portion is engaged with a plurality of engagement holes (adjustment holes) 60, 60, 60 provided in the support member 59 is connected to the front portion of the central leveling work device 7. And it is set as the structure suspended by the center part of right and left.

Next, a configuration for operating the leveling work devices 7, 9, 9 to adjust the vertical position and the storage position will be described with reference to FIG.
First, a pivot pin 63 facing the front of the machine body is fixed to a U-shaped support body 62 which is fixed to the center of the support frame 46 of the seedling stand 51 in the left-right direction and is provided downward. On the pivot pin 63, the vertical position adjusting lever 65 of the leveling work device 7, 9, 9 is pivotally supported so as to be rotatable in the left-right direction of the machine body. A bent piece 66 is fixed to the lower end portion of the vertical position adjusting lever 65, and the bent piece 66 is rotatably supported when the lever 65 is operated in the left-right direction of the machine body. The projecting portion 67 fixed to the beam member 48 is brought into contact with the lower portion to rotate in the vertical direction.

  Since the bent piece 66 is in contact with the lower side of the protruding portion 67, the protruding portion 67 is rotated by rotating the vertical position adjusting lever 65 to the right of the machine body (in the direction of arrow S in FIG. 6). In this configuration, the beam member 48 is pivoted upward.

  When the beam member 48 is turned upward, the left and right support arms 49, 49 and the left and right leveling work device support frames 50, 50 are turned upward, and the left and right leveling work devices 9, 9 are moved upward, and The link member 58 and the support member 59 whose bases are fixed to the beam member 48 are also moved upward, and the front portion of the central leveling work device 7 is also lifted upward via the spring 61.

  Conversely, when the vertical position adjusting lever 65 is rotated in the direction opposite to the arrow S, the bent piece 66 moves away from the lower side of the protruding portion 67 to the right side, so that the weight of the leveling work devices 7, 9, 9 is increased. Therefore, the three leveling devices 7, 9, 9 are all configured to move downward.

The vertical position adjusting lever 65 is arranged between the control seat 26 and the seedling mount 44 at the center position of the seedling planting device 3.
Further, when the leveling work devices 7, 9, and 9 are moved up to the storage position where the leveling is not performed, if the lever 65 is operated to the right (up to the storage position), the same procedure as the above-described upward movement operation is performed. It is set as the structure which can be raised to the accommodation position of the back side of the seedling stand 44. The vertical position adjusting lever 65 is configured to be movable along a lever guide provided at the guide position and locked at an appropriate position in the middle.

  In the embodiment described above, the left and right leveling work devices 9 and 9 at a standard position of the vertical position adjusting lever 65 at a height of 40 mm from the field scene are moved from the standard position by the rotation operation in the arrow S direction of FIG. The maximum height is set to 15 mm, and the maximum value is set to be 15 mm lower by the rotation operation in the reverse direction of the arrow S. The vertical adjustment of the leveling work devices 7, 9, 9 is performed simultaneously with changing the planting depth of the seedlings by moving the rear pivots of the floats 6, 8, 8 up and down. It shall be operated so that it can work.

  In particular, the center float 6 functioning as the ground sensor 5 for controlling the raising / lowering of the seedling planting device 4 has a long front-rear length in order to keep the seedling planting depth constant at the time of seedling transplanting operation. If the ground contact area is not lengthened in the front-rear direction, the raising / lowering control of the seedling planting device 3 cannot be performed appropriately. Therefore, the central leveling work device 7 disposed on the front side of the center float 6 is configured to be in front of the left and right leveling work devices 9 and 9 disposed on the front side of the side floats 8 and 8. The devices 7, 9, 9 are configured integrally with left and right chain cases 53, 53 serving as a transmission mechanism, and can be moved up and down by a vertical position adjusting lever 65. Thus, the seedling planting device 3 is configured with a light leveling device 7, 9, 9 with a relatively simple configuration, and is light in weight so that traveling performance in paddy fields is excellent. The transplanting operation can be performed well.

  As described above, the three leveling work devices 7, 9, 9 configured as described above are different from the left and right leveling work devices 9, 9 during the leveling work. It is used as a detector (topsoil softness sensor) that detects the softness of the topsoil, and as shown in FIG.

  And when the said detection information is input, the controller 4 replaces the vertical movement of the center leveling work apparatus 7 with the softness of the soil surface, and performs the correction | amendment of the sensitivity of raising / lowering control.

  In the case of the embodiment, when determining from the vertical movement of the central leveling device 7, the controller 4 determines that the soil is hard topsoil and corrects the reference value for the lifting control to the low sensitivity side. The correction adjustment of the control sensitivity is not limited to correcting the reference value of the angle of attack of the center float 6 (the ground sensor 5), but the adjustment of the pressing force of the float 6, the adjustment of the dead zone of the control, or the elevation Means such as correction adjustment of the output speed of the control can be considered.

  Thus, in the above-described embodiment, when the seedling transplanting operation is performed while the traveling vehicle body 1 is advanced in the field, the three ground leveling work devices 7, 9, 9 that are driven to rotate are removed from the topsoil. The central leveling device 7 that can be moved up and down independently by receiving a ground pressure is used as a soil softness sensor to detect vertical movement and to input detection information to the controller 4.

  Next, the outline of the operation will be described based on the flowchart shown in FIG. 2. When the central leveling device 7 is at the reference height position based on the detection information (within the normal vertical range). ), When moving forward on the lower side compared to the reference height (when the topsoil is soft), and when moving forward on the upper side (the topsoil is hard), the respective corrections are performed appropriately.

  Then, the controller 4 performs a calculation based on the detection information of the angle of attack inputted from the center float 6 and outputs a control signal for the elevation control. In this case, the controller 4 has already made the topsoil soft and soft. Since the control signal is output based on the degree of hardness of the soil in the field, the raising and lowering control is performed according to the actual situation, and the planting depth of the seedling transplanter can be maintained at a suitable height. Become.

  Since the elevation control operation of the embodiment detects the angle of attack using the center float 6 that slides immediately behind the central leveling work device 7 serving as the topsoil soft and soft sensor as the ground sensor 5, both detection positions are close to each other. Therefore, highly accurate lifting control is performed.

  Then, as an example, the central leveling work device 7 is provided with a transmission in the chain case so that the rotational speed is increased at a higher speed as it is pushed upward. As the leveling work device 7 is lifted upward, the leveling performance is improved and there is an advantage that it can be eliminated if there is a pebble.

  The central leveling work device 7 can also be used as a pitching sensor if the suspension support member 59 already described is replaced with a pitching cylinder. Usually, the pitching control device detects the inclination in the front-rear direction with a level sensor. In the case of the embodiment, the seedling planting device 3 moves up and down as the central leveling device 7 is pushed up from below during work. Based on the operation to be performed, the cylinder can be expanded and contracted to perform the vertical pitching operation.

Next, another embodiment of the transmission mechanism of the leveling work devices 7, 9, 9 will be described.
In the conventional configuration, the obstacle (leveling work device) that the chain case 53 provided between the leveling work devices 7 and 9 interferes with the upper input shaft 56 (the universal joint 56 in the embodiment shown in FIGS. 5 and 7). 7, 9 and 9 are frequently generated when moving up and down.) Further, between the central leveling work device 7 and the left and right leveling work devices 9 and 9 (between the unleveled areas), the leveling work cannot be performed. There was a problem of widening.

  First, as shown in FIGS. 8 and 9, the chain case 53 is connected to the output shaft 70 on the distal end side so as to be able to transmit to the drive shaft 55 of the central leveling work device 7, and the input shaft 71 is pivoted on the base side. Are connected to the input transmission case 72 and the drive shaft 52 of the left leveling work device 9 so as to be capable of transmission. As shown in the drawing, the input transmission case 72 is made close to the chain case 53 and joined to the upper case, and is extended upward and stacked vertically so that the input shaft 56 (the already described transmission-free transmission) is formed. The joint shaft is connected to support the bearing.

  If comprised in this way, as shown in FIG. 9, an Example becomes narrow in lateral width by planar view, and the space | interval (between the above-mentioned uneven terrain) between the center leveling work apparatus 7 and the left leveling work apparatus becomes narrow. There is an advantage that the left and right terrain districts can approach and widen the terrain. Furthermore, the chain case 53 is characterized in that the obstacle that interferes with the input shaft 56 is eliminated even if the leveling work devices 7, 9, 9 are moved up to the upper work position or moved up to a higher storage position. There is.

Next, an embodiment relating to the rake device 75 for erasing the wheel marks of the rear wheels 16, 16 in the riding type rice transplanter configured by connecting the seedling planting device 3 to the rear portion of the traveling vehicle body 1 will be described.
First, as shown in FIGS. 10 and 11, the rake device 75 for erasing the wheel marks is pivotally attached to the rear axle support machine frame portion 76 (provided inside the rear wheel gear cases 20, 20). A rake is attached to the tip of the rake mounting arm 77 that can freely rotate up and down, and when the topsoil is lowered to a position where the topsoil can be leveled, it is positioned after passing the left and right rear wheels 16 and 16, and the left and right rear wheels 16,16 It is set as the structure which can level and erase the trace of passing. In the embodiment shown in FIG. 10, a central rake 78 for leveling between the left and right wheels 16, 16 is provided at an intermediate portion of the rake mounting arm 77.

  In the rake device 75 of the above-described embodiment, the rake mounting arm 77 moves up and down with the rear axle support machine frame portion 76 as a rotation fulcrum, so that the rake device 75 always rotates in an arc locus without being affected by the vertical height. Further, there is a feature that a constant distance can be maintained from the outer periphery of the rear wheels 16 and 16 and there is no interference with surrounding members.

  The rake device 75 configured in this manner is configured to be able to descend to near the topsoil surface in relation to the turning operation of the traveling vehicle body 1 and to level and erase the passage marks of the rear wheels 16 and 16. In the embodiment shown in FIG. 10, the other end portion of the interlocking wire 80 having one end portion connected to the pitman arm 79 is connected to the rake mounting arm 77, and the steering operation of the steering handle 30 during turning (more than a certain angle to enable turning). The rake mounting arm 77 is rotated downward in conjunction with the large swaying of the steering wheel, and the rake device 75 reaches the leveling position.

  In the embodiment shown in FIG. 11, instead of the steering handle 30 (the pitman arm 79), the rake device 75 is used when the brake is turned by connecting to the left and right brake pedals 81, 81 via the rod 82. It is configured to be able to descend to a position where the mark is erased.

  In this case, the rake device 75 descends after the rear wheels 16 and 16 to level the ground, as indicated by the phantom line in FIG. 11, only when the brake pedals 81 and 81 are stepped on either the left or the right. It will be. In this configuration, the same effect can be expected even if the pedals 81 and 81 are replaced with side clutch pedals.

  As described above, in the embodiment, the rake device descends behind the rear wheels 16 and 16 only when the turning operation device (the steering handle 30, the left and right brake pedals 81 and 81, or the side clutch pedal) is turned, and the wheel marks are removed. It can be leveled and erased, so that subsequent transplanting of seedlings can be performed accurately.

  10 and 11, the rake device 75 is configured to move up and down by mechanical means using an interlocking mechanism. However, the rake device 75 is replaced with control means to electrically detect a switch (sensor), and It is free to make the rake mounting arm 77 up and down by a control motor or the like, and the same effect can be expected. The rake device 75 is configured to be able to rise to the original storage position and wait when the turning travel is completed.

  Next, the rake device 75 is provided with a restricting means so that it cannot be lowered when it is not necessary to descend or when it is dangerous to descend. For example, the restricting means may be configured such that when both the left and right brake pedals 81, 81 are integrally connected with a connecting tool (when traveling on a normal road), and when the forward / reverse switching lever is in the back travel position, or the shift lever The rake device 75 maintains safety as a configuration in which the rake device 75 cannot be moved up and down when the vehicle is at a road traveling speed position (for example, when the sub-shift is at a high speed position) or when the shift lever is at an extremely low speed position. It is said.

  In each of the above-described embodiments, the rake device 75 is lowered in relation to the turning operation, and this is related to the preliminary operation before turning, for example, when the seedling planting device 3 is raised. The rake device 75 may be configured to descend to a predetermined position. The riding rice transplanter has a working practice of raising the seedling planting device 3 before turning and turning safely.

  The rake device 75 is configured to be able to set a height position suitable for leveling in accordance with the topsoil surface by detecting the rotation angle of the elevating link device 2 with a sensor (potentiometer) at the position where the rake device 75 descends and stops. it can.

  With this configuration, the rake device 75 automatically determines the position where the rake device 75 is lowered and leveled. Therefore, the rake device 75 is insufficiently lowered and insufficiently leveled, or the rake device 75 is deeply lowered after being lowered. Therefore, it is possible to expect an accurate leveling at all times by eliminating troubles such as a large load and troubles.

Block diagram showing the control mechanism Flow chart of control action Side view of riding rice transplanter Plan view of the riding rice transplanter in FIG. Side view of the seedling planting device of FIG. FIG. 3 is a front view of the seedling support structure of FIG. Plan view of the seedling planting device of FIG. Side view of input transmission mechanism of leveling device Cutting plan view of input transmission mechanism Side view of a riding rice transplanter provided with a rake device according to another embodiment Side view of a riding rice transplanter provided with a rake device according to another embodiment (a: general view, b: partial view during turning) Plan view of a riding rice transplanter of another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling vehicle body 2 Elevating / lowering link device 3 Seedling planting device 4 Control means 5 Grounding sensor 6 Center float 7 Central leveling work device 8 Side float 9 Left and right leveling work device 10 Transmission mechanism

Claims (2)

  To provide a seedling planting device (3) that is lifted and lowered by a lifting link device (2) at the rear of the traveling vehicle body (1), and to maintain the planting depth at a set position based on the detection value of the ground sensor (5) In the seedling transplanting machine provided with the control means (4) for controlling the raising and lowering of the seedling planting device (3), the seedling planting device (3) is a central leveling on the front side of the center float (6) provided below it. The work device (7) has a structure in which left and right leveling work devices (9) are arranged in front of the left and right side floats (8), respectively, and are transmitted to the central leveling work device (7) and the left and right leveling work devices (9). And a central leveling work device (7) and a left and right leveling work device (9) are provided so as to be vertically adjustable with respect to the seedling planting device (3). ) Can move up and down independently with respect to the left and right leveling work device (9) The control means (4) is configured to correct the elevation control sensitivity of the seedling planting device (3) based on the softness of the soil detected by the vertical movement of the central leveling device (7). A seedling transplanter.   The seedling transplanter according to claim 1, wherein a center float (6) having a central leveling device (7) disposed on the front side is used as the ground sensor (5).

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