JP2008228594A - Rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for forming the connection portion of an interlocking wire disposed in the front end portion of a center float and connected to the elevation control mechanism of a planting portion in a newly appeared space in a front portion and for improving the layout of the interlocking wire, in a rice transplanter in which a field surface-leveling device is disposed in front of the floats. <P>SOLUTION: This rice transplanter 1 which has a center float 31 swingingly supported on the planting flame body of the planting portion 3 and controls the operation of a hydraulic valve for lifting the planting portion by the vertical movements of the tip end portion of the center float 31 has disposed a link body (support arm 61, link mechanism 70, or the like) connected to the tip end portion of the center float 31, connecting a wire body (interlocking wire 46) for operating the hydraulic valve to the link body, and rotating the link body in interlock with the vertical movements of the center float 31 to operate the interlocking wire 46 in the longitudinal direction of the rice transplanter 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for attaching an interlocking wire connected to an elevation control mechanism to a front end portion of a sensor float in a rice transplanter that arranges a field leveling device in front of each float.

2. Description of the Related Art Conventionally, a rice transplanter in which a planting part is mounted on a rear part of a machine body so as to be movable up and down is known (see Patent Document 1). A sensor float (center float) is arranged at the left and right center of the lower part of the planting part, and side floats are arranged on the left and right sides of the sensor float, and each float has a planting transmission frame. The float support arm is further extended so as to be swingable.
The center float is configured to be longer in the front-rear direction than the left and right side floats, and the front end of the center float projects forward from the front end of the side float. The front end of the sensor float is connected to one end of an interlocking wire connected to the lift control mechanism, and the other end is connected to the hydraulic valve of the lift control mechanism. When the part moves up and down, the hydraulic valve is switched via an interlocking wire.
Japanese Patent Laid-Open No. 2005-17689

However, if the field leveling device is disposed between the float and the rear wheel, the floats need to be moved rearward by the space in which the leveling device is disposed. As a result, the total length becomes longer, the turning radius becomes larger, and there are problems that the turning operation at the end of the field increases. In addition, when the center float is simply shortened, there is no sufficient space above the front end, so the elevation detection range is also reduced.
Therefore, in the present invention, in the rice transplanter that arranges the field leveling device in front of each float, the connecting portion of the interlocking wire disposed at the front end portion of the center float and connected to the lifting control mechanism of the planting portion, It is a problem to provide a technology that uses a space that newly appears in the front part and that improves the layout of the interlocking wires.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in the first aspect, the planting is provided with a center float that is swingably supported by the planting frame body of the planting unit, and controls the operation of the planting unit lifting hydraulic valve by the vertical movement of the center float tip. In the machine, a link body connected to the center float tip is provided, a wire body for operating the hydraulic valve is connected to the link body, and the link body rotates in conjunction with the vertical movement of the center float. Thus, the wire body is operated in the longitudinal direction of the machine.

  According to a second aspect of the present invention, the link body is rotatably supported by the planting frame body.

  As effects of the present invention, the following effects can be obtained.

In a rice transplanter comprising a center float that is swingably supported on a planting frame body of a planting part, and controlling the operation of the planting part lifting hydraulic valve by the vertical movement of the center float tip part. A link body that is connected to the tip of the center float, a wire body that operates the hydraulic valve is connected to the link body, and the link body rotates in conjunction with the vertical movement of the center float. The wire body can be operated in the longitudinal direction of this machine, and even if the space above the center float is narrow, a link mechanism part related to lifting control can be arranged, and the entire lifting control mechanism can be made compact. Can be planned.
Further, since the direction of the wire body can be set to the front-rear direction, unlike the case of the conventional arrangement in the up-down direction, there is no need to bend from the vertical direction to the horizontal direction once. The dynamic resistance can be reduced, and it is economical because it is not necessary to separately provide a guide member or the like for changing the direction of the wire body.

  In claim 2, the link body is rotatably supported on the planting frame body, so that it is not necessary to separately form a link body support portion using another member, and the number of parts can be reduced, or The weight is reduced and it is economical.

  Next, embodiments of the invention will be described.

  1 is a side view showing an overall configuration of a rice transplanter according to an embodiment of the present invention, FIG. 2 is a perspective view showing an overall configuration of a center float, and FIG. 3 is a perspective view showing a configuration in the vicinity of the front portion of the center float. 4 is also a side view, FIG. 5 is also a front view, FIG. 6 is a perspective view showing the configuration near the rear part of the center float, FIG. 7 is a side view showing the configuration of the connecting portion below the connecting arm, and FIG. FIG. 9 is a side view showing the positional relationship between the swing support position of the center float and the swing support position of the side float.

  First, the whole structure of the rice transplanter 1 which concerns on one Example of this invention is demonstrated. In the following description, the direction of arrow A shown in the figure is the forward direction.

  As shown in FIG. 1, the rice transplanter 1 includes a traveling unit 2 and a planting unit 3, and the planting unit 3 is connected to a rear part of the traveling unit 2 by an elevating mechanism 4 so as to be movable up and down. In the traveling unit 2, an engine is mounted in a bonnet 7 provided at the front portion of the body frame 5, and a traveling mission 8 is disposed below the engine.

  A front axle case is disposed below the traveling mission 8, and front wheels 10 are attached to the left and right sides of the front axle case, respectively. A rear axle case 11 is provided at the rear of the body frame 5, and rear wheels 12 are attached to the left and right sides of the rear axle case 11.

  The engine and the traveling mission 8 are interlocked and connected via a transmission belt, and the traveling mission 8 and the front wheel 10 are interlocked and connected via a power transmission mechanism in the front axle case. The transmission 8 and the rear wheel 12 are interlocked and connected via a transmission shaft 13 and a power transmission mechanism in the rear axle case 11.

  Thus, the power of the engine is transmitted to the traveling mission 8, and then the power shifted by the traveling mission 8 is transmitted to the front wheel 10 and the rear wheel 12, respectively, and the front wheel 10 and the rear wheel 12 are driven. It is configured to be. Thereby, the traveling unit 2 can travel forward or backward.

  In the traveling unit 2, a driving operation unit 15 is disposed in the front and rear center of the body frame 5. In the driving operation unit 15, a steering handle 16 for performing a steering operation of the traveling unit 2, a shift pedal for performing a shifting operation of the traveling unit 2, and the like are provided at the front, and a seat 17 is provided at the rear. Thus, various operations can be performed on the traveling unit 2 or the planting unit 3.

  In the planting unit 3, the planting frame body includes a planting frame 21, a planting mission 22, a transmission shaft case 23, a planting transmission case 25, and the like, and the planting frame 21 is arranged behind the traveling unit 2. A planting mission 22 is provided at the center lower portion of the planting frame 21. A transmission shaft case 23 (see FIG. 6) extends in the left-right direction from the planting mission 22, and a plurality of planting transmission cases 25 extend rearward from the transmission shaft case 23 at appropriate intervals. . A planting claw 28 is provided at a rear portion of the planting transmission case 25 via a rotary case 27.

  Then, the planting mission 22 and the planting claw 28 of each planting transmission case 25 are linked together via a power transmission shaft case 23 or a power transmission mechanism in the planting transmission case 25, and from the engine of the traveling unit 2. The power transmitted to the planting mission 22 via the PTO shaft or the like is transmitted from the planting mission 22 to the planting claw 28 so that the planting claw 28 is driven.

  A seedling stand 29 is disposed above the planting transmission case 25 and is attached to the rear portion of the planting frame 21 so as to be able to reciprocate in the left and right directions. In this way, after the seedling stage 29 is moved to an appropriate position in the left-right direction, the seedlings are cut from the seedling mat placed on the seedling stage 29 by the planting claws 28 and planted in the field. It has become.

  A float device is provided below the planting transmission case 25. In the float apparatus, a center float 31 and side floats 32 and 32 are provided, and the center float 31 serving as a sensor float is located in the center of the left and right, and the side floats 32 and 32 are located on both the left and right sides of the center float 31. Is arranged. The center float 31 and the side floats 32 and 32 are center floats extending rearward from a float support 33 (see FIG. 6) extending in the left-right direction in parallel with the transmission shaft case 23 at the rear of each. It is supported via a support arm 35 (see FIG. 6) so as to be swingable in the vertical direction.

  An elevating mechanism 4 is provided between the traveling unit 2 and the planting unit 3. In the elevating mechanism 4, a top link 42 and a lower link 43 are installed between a support frame 41 erected on the rear axle case 11 and a support bracket connected to the front lower part of the planting frame 21 so as to be able to swing left and right. An elevating cylinder 44 is connected between the front portion of the lower link 43 and the traveling unit 2. When the lifting / lowering cylinder 44 is expanded and contracted, the planting unit 3 is configured to move up and down with respect to the traveling unit 2 via the top link 42 and the lower link 43.

  Here, the lifting / lowering cylinder 44 is configured to be expanded and contracted by switching a hydraulic valve of a hydraulic driving unit (not shown). An interlocking wire 46 is interposed between the hydraulic valve and the front end portion of the center float 31 of the planting part 3, and the interlocking wire 46 (see FIG. 2) interlocks with the swinging of the center float 31 for hydraulic pressure. The valve is operated, and the lifting / lowering cylinder 44 is expanded and contracted. Thereby, according to the height of the planting surface of the farm field sensed by the center float 31, the planting part 3 can be raised / lowered appropriately and the planting depth of a seedling can be kept constant.

  Further, a leveling device 51 is provided below the lifting mechanism 4 between the rear wheel 12 and the floats 31 and 32. The leveling device 51 is provided with a leveling roller 52 in the left-right direction in front of the center float 31 and the side float 32 of the planting unit 3, and is attached to the leveling roller 52 (see FIG. 8) and the rear axle case 11 of the traveling unit 2. The transmission mechanism in the transmission case 53 is linked and connected via a leveling shaft. Thus, the power transmitted to the rear axle case 11 is transmitted to the leveling roller 52 via the transmission case 53, and the leveling roller 52 is rotationally driven. Thereby, leveling is performed by the leveling device 51 before planting.

  Next, the structure of the center float 31 provided in the planting part 3 will be described.

  The center float 31 is disposed so that the front end position thereof is substantially the same as the front end position of the side float 32 in the front-rear direction, and as shown in FIG. 2, the center float support arm 33 is attached to the float support 33 at the rear end portion. 35 and supported by the float support 33 and the transmission shaft case 23 via the link mechanism 70 at the front end. The float support 33 extends in the left-right direction in parallel with the transmission shaft case 23 below the transmission shaft case 23 and is connected to the transmission shaft case 23 at both the left and right side portions and the central portion thereof.

  At the rear part of the center float 31, a bracket 38 fixed to the upper surface of the rear part of the center float 31 is connected to a rear end part of the center float support arm 35 extending rearward and downward from the float support 33 via a connecting arm 45. It is pivotally supported by a pivot pin 59. Thus, the center float 31 is supported so as to be swingable in the vertical direction with the pivot pin 59 as a fulcrum, and its front end can be moved up and down according to the shape of the planting surface of the field.

  On the other hand, at the front end portion of the center float 31, a bracket 62 fixed on the upper surface of the front end of the center float 31 is interlocked with the support arm 61 supported by the float support 33 and the transmission shaft case 23 via the link mechanism 70. It is connected. Thus, when the center float 31 swings in the vertical direction with the pivot pin 59 at the rear end as a fulcrum, the front float can be supported while moving up and down.

  Hereinafter, the configuration near the front end of the center float 31 will be described in detail.

  As shown in FIGS. 3, 4 and 5, the support arm 61 connects a pair of left and right plates 61a and 61a extending in the front-rear direction by a connecting piece 61b on the front side (one side) in the longitudinal direction, and rearwardly. It has a U-shape in plan view that opens toward the top. Then, after extending rearward from the front end portion in a side view, the front horizontal portion is positioned on the upper side and the rear horizontal portion is positioned on the lower side so as to extend obliquely downward and further rearwardly. Thus, it is formed in a substantially crank shape.

  At the rear part of the support arm 61, brackets 63 projecting forward from the float support 33 are arranged outside the left and right plates 61a and 61a, and the overlapping portions of the plates 61a and 61a and the bracket 63 are mutually disposed. An insertion hole is provided in the. A pivot pin 64 is inserted in the left-right direction through the insertion hole 61 c of the support arm 61 and the insertion hole of the bracket 63, and the support arm 61 is pivotally supported by the bracket 63 by the pivot pin 64.

  Further, in front of the pivot point by the pivot pin 64, a bracket 65 projecting downward from the transmission shaft case 23 is disposed between the left and right plate bodies 61a and 61a, and the plate bodies 61a and 61a and the brackets are arranged. An insertion hole is provided in the overlapping portion with 65. A pivot pin 66 is inserted in the insertion hole 61 d of the support arm 61 and the insertion hole of the bracket 65 in the left-right direction, and the support arm 61 is pivotally supported by the bracket 65 by the pivot pin 66.

  Thus, the support arm 61 is supported by the float support 33 and the transmission shaft case 23 at the rear part. The upper link 71 of the link mechanism 70 positioned between the support arm 61 and the center float 31 is rotated on the left and right plate bodies 61a and 61a in front of the pivot point by the pivot pin 66 at the rear of the support arm 61. It is supported freely.

  The link mechanism 70 is composed of a plurality of link bodies that are connected to each other so as to be rotatable up and down. In this embodiment, the link mechanism 70 includes an upper link 71 and a lower link 72. The upper link 71 is configured by a substantially U-shaped plate body, and is opened so as to open upward when viewed from the front, and is inclined and extended in the front lower direction. And it has the protrusion part 71a which protrudes upwards in the rear part of the left side, and is formed in the substantially L shape by the side view.

  On the rear side of the upper link 71, the left rear protrusion 71 a is disposed between the left and right plates 61 a and 61 a of the support arm 61, and the right rear portion is disposed outside the right plate 61 a of the support arm 61. In addition, an insertion hole is provided in an overlapping portion between the upper link 71 and the support arm 61. A pivot pin 73 is inserted into the insertion hole 71b of the upper link 71 and the insertion hole 61e of the support arm 61 in the left-right direction so that the upper link 71 can be rotated to the support arm 61 by the pivot pin 73. It is pivotally supported.

  The lower link 72 is configured by a substantially U-shaped plate body, and is opened so as to open upward in a front view and extend in the vertical direction. A bent portion 72a that is bent substantially perpendicularly toward the rear is provided at the upper portion thereof, and is formed in an approximately L shape in a side view.

  On the upper side of the lower link 72 (the front side of the upper link 71), the left bent portion 72a is disposed between the left and right front portions of the upper link 71, and the right bent portion 72a is disposed outside the right front portion of the upper link 71. Thus, an insertion hole is provided in the overlapping portion of the lower link 72 and the upper link 71. A pivot pin 74 is inserted into the insertion hole 72b of the lower link 72 and the insertion hole 71c of the upper link in the left-right direction, and the lower link 72 pivots to the upper link 71 by the pivot pin 74. It is supported.

  Here, a concave portion 71d that is recessed rearward is formed in the front portion of the upper link 71 that faces the left-side bent portion 72a of the lower link 72, and the left-side bent portion 72a of the lower link 72 moves to the concave portion 71d. Thus, the upper link 71 can be contacted. In other words, the lower link 72 is configured to be able to rotate without interfering with the upper link 71 within a predetermined range, and when the upper link 71 rotates beyond the predetermined rotation range, the upper link 71 comes into contact with and rises. It is configured not to be too much. As a result, the highest rising position of the front end portion of the center float 31 is defined, and it is prevented that the center float 31 comes into contact with other members and breaks when it rises.

  On the lower side of the lower link 72, a bracket 62 fixed to the upper part of the front end of the center float 31 is disposed outside the lower left and right sides of the lower link 72 so that the bracket 62 and the lower link 72 overlap each other. An insertion hole is provided. A pivot pin 75 is inserted in the left and right direction into the insertion hole 62a of the bracket 62 and the insertion hole 72c of the lower link 72, and the bracket 62 is pivotally supported by the pivot pin 75 so as to be rotatable to the lower link 72. Has been.

  Thus, the link mechanism 70 includes the upper link 71 and the lower link 72 and is provided between the rear portion of the support arm 61 and the front end portion of the center float 31 so as to support the center float 31 so as to be swingable. It has become. In the link body of the link mechanism 70, the upper link 71 is connected to the rear end portion of the interlocking wire 46 extending backward from the hydraulic valve of the hydraulic drive unit of the lifting mechanism 4. Is pushed and pulled in the front-rear direction by the rotation of the upper link 71.

  That is, the interlocking wire 46 is composed of an outer wire 46a and an inner wire 46b inserted through the outer wire 46a, and the rear end portion of the outer wire 46a is supported by the connecting piece 61b at the front end portion of the support arm 61, From here, the inner wire 46b extends backward between the left and right plates 61a and 61a, and the rear end of the inner wire 46b is connected to the upper end of the projecting portion 71a of the upper link 71 via the buffer spring 78 with the engaging pin 79. It is connected.

  The interlocking wire 46 is supported by the front end portion of the support arm 61, and then is linearly arranged forward and connected to the hydraulic valve of the hydraulic drive unit of the elevating mechanism 4 as in the prior art. Unlike the case of being arranged in the vertical direction, there is no need to bend in the horizontal direction once from the vertical direction, and sliding resistance between the outer wire 46a and the inner wire 46b at the bent portion does not occur.

  With this configuration, when the front end portion of the center float 31 moves upward when the center float 31 swings in the vertical direction, the lower link 72 rotates counterclockwise in FIG. 4 with the pivot pin 75 as a fulcrum. It is rotated in the direction and is brought into contact with the upper link 71. When the lower link 72 is further rotated in this contact state, the upper link 71 is pushed up by the lower link 72 and is rotated in the clockwise direction in FIG. 4 with the pivot pin 73 as a fulcrum.

  As the upper link 71 rotates, the protrusion 71a is moved rearward, and the inner wire 46b of the interlocking wire 46 connected to the protrusion 71a via a buffer spring 78 is pulled rearward. The hydraulic valve of the hydraulic drive unit connected by the traveling unit 2 is operated. As a result, the lifting / lowering cylinder 44 is extended and the planting part 3 is raised with respect to the traveling part 2 by the lifting / lowering mechanism 4.

  On the other hand, when the front end portion of the center float 31 moves down during the swinging of the center float 31, the lower link 72 is rotated in the clockwise direction in FIG. The pivot point by the pivot pin 74 between the upper link 71 and the upper link 71 is pulled downward, and the upper link 71 is rotated in the counterclockwise direction in FIG.

  As the upper link 71 rotates, the protrusion 71a is moved forward, and the inner wire 46b of the interlocking wire 46 connected to the protrusion 71a via a buffer spring 78 is pushed forward. The hydraulic valve of the hydraulic drive unit connected by the traveling unit 2 is operated. As a result, the lifting / lowering cylinder 44 is contracted and the planting unit 3 is lowered with respect to the traveling unit 2 by the lifting / lowering mechanism 4.

  When the center float 31 swings, if the front end of the center float 31 moves up and down only slightly (predetermined amount), the lower link 72 and the upper link 71 correspond to the swing of the center float 31 as described above. However, the displacement amount of the protrusion 71a of the upper link 71 is absorbed by the buffer spring 78, and the inner wire 46b of the interlocking wire 46 is not pushed or pulled. As a result, the hydraulic valve of the hydraulic drive unit is not operated, and the planting unit 3 is not raised or lowered. This prevents hunting and the like from occurring.

  Thus, during the planting operation of the rice transplanter 1, the vertical movement of the front end due to the swing of the center float 31 is sensed, that is, the height of the planting surface of the field is sensed, and the lifting mechanism is linked to the sensing result. By appropriately raising and lowering the planting part 3 by 4, the planting depth of the seedlings by the planting claws 28 can be maintained constant. However, the limit of the vertical movement of the center float 31 that prevents the hydraulic valve of the hydraulic drive unit from operating can be arbitrarily changed. Further, a planting depth adjusting lever (not shown) is connected to the float support 33, and the float support 33 is moved up and down with respect to the transmission shaft case 23 by rotating the planting depth adjusting lever. The planting depth can be adjusted by changing the height of the planting claw 28 with respect to the float 32.

  In the above-described configuration, since the support arm 61 that supports the front end portion of the center float 31 is supported at a position close to the float support 33 and the transmission shaft case 23 at the rear portion, the center float is supported. There is a possibility that the support arm 61 may rattle due to vibrations transmitted when the 31 swings, the position of the link mechanism 70 may be out of order, and the change in the vertical movement of the center float 31 may not be accurately transmitted to the hydraulic valve of the hydraulic drive unit. In order to solve this problem, the following structure is provided.

  That is, as shown in FIGS. 3, 4, and 5, among the front and rear insertion holes 61 d and 61 c provided in the rear part of the support arm 61, the rear side (float support 33 side) insertion hole 61 c is in the longitudinal direction. The support arm 61 is inserted into the insertion hole 61d on the front side (transmission shaft case side) within a range in which the pivot pin 64 inserted therethrough is slidable. The support pin 66 can be slightly rotated (predetermined amount) with the fulcrum as a fulcrum.

  A tension spring 81 is interposed between the front portion of the support arm 61 and the planting frame 21 located above the support arm 61 so as to extend in the vertical direction, and the support arm 61 is pivotally supported by the tension spring 81. The pin 66 is urged to rotate upward with the fulcrum as a fulcrum. Thus, the influence of the vibration transmitted to the support arm 61 can be eliminated, thereby preventing the support arm 61 from rattling.

  Here, in the front portion of the support arm 61, the left and right plate bodies 61a are provided with insertion holes 61f, and the engagement pins 82 are inserted in the insertion holes 61f in the left-right direction. A hook portion 81 a provided at the lower end portion of the tension spring 81 is engaged with the engagement pin 82, and the other end (upper end) of the tension spring 81 is locked to the planting frame 21. The support arm 61 is urged by the urging force so as to rotate clockwise in FIG. 4 with the pivot pin 66 as a fulcrum. As a result, the tension spring 81 can be easily connected to the front portion of the support arm 61 simply by engaging the hook portion 81 a of the tension spring 81 with the engagement pin 82.

  In this way, the planting part 3 is connected to the rear part of the traveling part 2 via the lifting mechanism 4 so as to be movable up and down, and the center float 31 is provided on the planting part 3 so as to be swingable in the vertical direction. An interlocking wire 46 is interposed between the front end portion of 31 and the hydraulic drive portion of the elevating mechanism 4, and the hydraulic drive portion is operated in conjunction with the vertical movement of the front end portion of the center float 31 by the interlocking wire 46. In the rice transplanter 1 that moves the planting unit 3 up and down, a link mechanism 70 is interposed between the front end of the center float 31 and the interlocking wire 46, and the interlocking wire is moved by the link mechanism 70 when the center float 31 swings. By adopting a structure that pushes and pulls 46 in the front-rear direction, the elevating mechanism 4 is provided at the front end portion of the center float 31 even if a sufficiently large space cannot be secured above the front end portion of the center float 31. It can be interlockingly connected with interlocking wire 46 extending from the hydraulic drive unit. Further, the interlocking wire 46 can be extended without being in contact with the constituent members of the planting portion 3 and can be connected to the link mechanism 70 and the hydraulic drive unit, and the sliding resistance of the interlocking wire 46 is reduced. be able to.

  Further, in the rice transplanter 1, the support arm 61 constituting the link body is rotatably supported by the planting transmission case 23 constituting the planting frame body, thereby separately supporting the link body using another member. There is no need to configure the part, and the number of parts or the weight can be reduced, which is economical.

  Further, a support arm 61 that supports the link mechanism 70 is provided on the planting part 3 so as to be rotatable by a predetermined amount in the vertical direction, and the support arm 61 is rotated in one direction by a biasing member, that is, a tension spring 81. Such a biasing configuration can prevent rattling of the support arm 61 that supports the link mechanism 70, stably supports the center float 31 on the support arm 61, and the hydraulic pressure of the hydraulic drive unit. The change in the vertical movement of the front end portion of the center float 31 can be accurately transmitted to the valve via the interlocking wire 46.

  Further, in the rice transplanter 1, the biasing member is constituted by a tension spring 81, and a hook portion 81a provided on the tension spring 81 is engaged with an engagement pin 82 inserted and supported by a support arm 61, thereby With the configuration in which the spring 81 and the support arm 61 are connected, the urging member, that is, the tension spring 81 can be easily attached to the support arm 61, and assemblability can be improved.

  In the above-described configuration, as shown in FIGS. 3, 4, and 5, an insertion hole 61 g is provided in the left plate 61 a at the center of the support arm 61, and is disposed on the side. An insertion hole 71e is provided in the protrusion 71a of the upper link 71 so as to coincide with the insertion hole 61g of the support arm 61 when the center float 31 and the interlocking wire 46 are in the initial setting position. An engagement pin 82 that engages with the tension spring 81 can be inserted into the insertion hole 61 g of the support arm 61 and the insertion hole 71 e of the upper link 71.

  As described above, the rice transplanter 1 includes the upper link 71 and the lower link 72 (a plurality of link bodies) that are mutually connected to the link mechanism 70, and the upper link 71 and the support arm 61, respectively, have insertion holes 71 e. 61g is provided so as to coincide with each other, and the engagement pin 82 can be inserted into the insertion holes 71e and 61g, so that the engagement pin 82 is removed from the support arm 61, and the upper link 71 By communicating with the insertion hole 71e and the insertion hole 61g of the support arm 61, the upper link 71 can be held unrotatable and the link mechanism 70 can be deactivated. Therefore, as described above, the insertion holes 71e and 61g are provided, and the position of the planting part elevation control unit including the center float 31 and the interlocking wire 46 in this holding state is set to be the initial set position. Thus, it becomes possible to easily determine the initial set position at the time of assembling, and it is possible to improve the work efficiency of the assembling adjustment and perform a reliable adjustment without the need for a special adjusting tool.

  Next, the configuration in the vicinity of the rear portion of the center float 31 in the present embodiment will be described in detail.

  As shown in FIGS. 6 and 7, the rear portion of the center float 31 is connected to a float support 33 that is connected to the planting frame 21 among the planting frames via a connection mechanism 48. The connection mechanism 48 includes a center float support arm 35 serving as a first operation arm protruding rearward from the float support 33, a connection arm 45 serving as a second operation arm, an attachment member 47, and the like.

  Thus, the front end positions of the center float 31 and the side float 32 are arranged at substantially the same position in the front-rear direction, the center float 31 and the planting frame body are connected via the connection mechanism, and the connection mechanism is operated in the first operation. It consists of an arm and a second operation arm, the front part of the first operation arm is connected to the planting frame body, the rear part pivotally supports the front part of the second operation arm, and the second operation arm The center float 31 is swingably supported at the rear part.

  The second operation arm is provided with a rotation support portion at a place different from the pivotal support portion with the rear portion of the first operation arm and the support portion with the center float 31. This rotation support portion is supported by a support shaft provided in a planting transmission case 25 connected to the planting frame 21.

  The center float support arm 35 is formed so that the plate is bent in a “U” shape when viewed from the front cross section, and is attached so that the lower part is open. The front end of the center float support arm 35 is fixed to the float support 33 and the rear part extends rearward and lower. The center float support arm 35 is pivotally connected to a bracket 38 fixed on the rear portion of the center float 31 via a lower portion of a connecting arm 45 serving as a pivotal support portion. A pivot pin 59 that pivotally supports the pivot hole 45 e of the connecting arm 45 and the bracket 38 serves as a pivot point of the center float 31. However, it is possible to connect via a stay or the like instead of the connecting arm 45, and it is also possible to connect the bracket 38 directly to the rear end of the center float support arm 35 as in the prior art. .

  Long holes 35a extending in the front-rear direction are opened on the left and right side surfaces of the rear end of the center float support arm 35. On the other hand, the connecting arm 45 is formed in a rear portal shape by a right support body 45a and a left support body 45b extending in the vertical direction, and a lateral support body 45c connecting the right support body 45a and the upper part of the left support body 45b. It is configured. The right support 45a is formed by bending a plate body into a “U” shape in a cross-sectional view that opens downward, and a lower portion of the right support 45a is formed in a substantially triangular shape in side view, and is formed at a front lower portion of the right support 45a. A pivot hole 45d is opened, and a connecting pin 58 is inserted in the left and right direction through the pivot hole and the elongated hole 35a, so that the coupling mechanism 48 is allowed to move back and forth within the elongated hole range. However, as shown in FIG. 7, a plurality of pivot holes 45d, 45d,... Are opened at predetermined intervals in the front-rear direction at the lower portion of the right support 45a, and any of the pivot holes 45d, 45d,. Alternatively, the rear end of the center float support arm 35 may be pivotally supported by the connecting pin 58.

  With this configuration, the attachment position of the center float 31 can be selected from any of the pivot holes 45d, 45d..., So that the position of the center float 31 and the side float 32 can be The attachment position can be easily adjusted even when the seedling planting depth is not uniform.

  The height of the horizontal support 45c of the connecting arm 45 is such that the upper end of the planted seedling does not hit, so that when the horizontal support 45c moves after planting, the seedling is bypassed and defeated without falling. It is configured to pass above. Therefore, the connecting arm 45 can also be configured in an inverted U shape when viewed from the rear.

  Further, the other side of the connecting arm 45 extends from the center float 31 to the rear side of the planting transmission case 25 at the center of the left and right, and is connected to the rear part of the planting transmission case 25 by a rotation support part. That is, the support shaft 45f protrudes laterally in the horizontal direction from the lower end of the left support 45b located on the rear side of the planting transmission case 25 in the connecting arm 45, and the support shaft 45f is disposed behind the planting transmission case 25. It is pivotally supported by a mounting member 47 fixed at the end. The mounting member 47 is formed by bending the plate into a quadrangular shape in plan view, the front plate is fixed to the rear surface of the planting transmission case 25 with bolts or the like, and the left and right side plates are provided with through holes in the left-right direction to support the support. The shaft 45f is inserted and pivotally supported.

  In this way, the connecting arm 45 is formed in a gate shape that opens downward in front view, so that the seedling planted by the planting claw 28 arranged in front of the connecting arm 45 is not overturned by the connecting mechanism 48. The center float 31 can be supported. In addition, since the center float 31 is supported by both the center float support arm 35 and the connecting mechanism 48, the strength is increased compared to the cantilever structure, and the support can be stably supported.

  In the rice transplanter 1 according to the present embodiment, the leveling device 51 is provided immediately below the planting unit 3 as described above, and the center float 31 and the side float 32 are arranged behind the leveling device 51. Established. That is, as shown in FIGS. 1 and 8, the leveling device 51 is disposed in the horizontal direction immediately in front of the center float 31 and the side float 32, so that the conventional arrangement of the center float 31 and the side float 32 has a full length. Will become longer.

  Therefore, as shown in FIGS. 8 and 9, the front and rear lengths of the center float 31 and the side float 32 are almost the same as the conventional length, and the center float 31 is configured to be longer than the side float 32 in the front and rear direction. The center float 31 and the side float 32 are arranged so that the front end positions are substantially the same position, that is, on the “X1 line” shown in FIG. Therefore, the rear end position of the center float 31 is located behind Y1 compared to the rear end position of the side float 32.

  A bumper body 18 provided at the rear end portion of the planting transmission case 25 is disposed behind the center float 31 but slightly behind the dimension Y2. The planting transmission case 25 to which the bumper body 18 is attached is disposed on both the left and right sides of the planting transmission case 25 to which the coupling mechanism 48 is attached. In the present embodiment, a five-planted rice transplanter is described, but four-planted or six-planted or more rice transplanters are also arranged in the same manner.

  Thus, the center float 31 and the coupling mechanism 48 are arranged such that the rear end position of the center float 31 is disposed forward with respect to the bumper body 18 provided at the rear end of the planting transmission case 25 provided in the planting unit 3. Etc. will be sufficiently protected against external force from the rear, and deformation and breakage can be prevented.

  Further, in order to obtain a lift sensing performance equivalent to the conventional one by forming the entire length of the center float 31 longer than the total length of the side float 32, as shown in FIG. The side float 32 is disposed behind the swing fulcrum of the dimension Z.

  That is, a center float support arm 35 protrudes obliquely rearward and downward from the substantially right and left central portion of the float support 33, and side float support arms 39 obliquely rearward and downward from the float support 33 on both the left and right sides of the center float support arm 35.・ 39 is protruding. A bracket 38 fixed on the rear part of the center float 31 is connected to the rear end of the center float support arm 35 via a connecting arm 45, and a bracket 60 fixed to the rear part of the side float 32 on the rear part of the side float 32. Are concatenated. The sensor float support arm 35 is configured to be longer than the side float support arm 39 and supported by the same float support 33.

  Thus, in the rice transplanter 1 in which the field leveling device 51 is arranged in front of the float device (the floats 31 and 32) in the planting unit 3, the center float 31 and the side float 32 are planted frames. The planting frame 21 and the planting transmission case 25 constituting the body are swingably supported, and the front end positions of the center float 31 and the side float 32 are arranged at substantially the same position in the front-rear direction. By arranging the swing support position behind the swing support position of the side float 32, it becomes possible to lengthen the entire length of the center float 31 compared to the side float 32, and the entire planting part 3. Detecting the elevation height of the front end of the center float 31 that functions as a sensor for performing elevation control without changing from the conventional one. Possible and will, prior substantially the same follow to elevation control of the planting unit 3 with respect to irregularities in the field plane is enabled.

  In addition, by making the front end positions of the floats 31 and 34 substantially the same in the front-rear direction, the float can be arranged without interfering with the leveling device 51, and the field scene after leveling can be finished finely.

The side view which shows the whole rice transplanter structure concerning one Example of this invention. The perspective view which shows the whole structure of a center float. The perspective view which shows the structure of the front part vicinity of a center float. Similarly side view. Similarly front view. The perspective view which shows the structure near the rear part of a center float. The side view which shows the structure of the connection part of a connection arm lower side. The bottom view which shows the arrangement | positioning relationship between a center float and a side float. The side view which shows the arrangement | positioning relationship between the rocking | fluctuation support position of a center float, and the rocking | fluctuation support position of a side float. (A) Side view of center float. (B) Side view of the side float.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rice transplanter 3 Planting part 21 Planting frame 23 Transmission shaft case 31 Center float 32 Side float 33 Float support 35 Center float support arm 46 Linking wire 46a Outer wire 46b Inner wire 51 Leveling device 61 Support arm 61a Plate body 61b Connection Piece 61c Insertion hole 61d Insertion hole 61e Insertion hole 61f Insertion hole 61g Insertion hole 62 Bracket 62a Insertion hole 63 Bracket 64 Pivot pin 65 Bracket 66 Pivot pin 70 Link mechanism 71 Upper link 71b Insertion hole 71c Insertion hole 71d Recessed part 71d 72a Bending portion 72c Insertion hole 74 Pivoting pin 75 Pivoting pin 78 Buffer spring 79 Engaging pin 81 Tension spring 82 Engaging pin

Claims (2)

  In the rice transplanter having a center float swingably supported on the planting frame body of the planting part and controlling the operation of the hydraulic valve for raising and lowering the planting part by the vertical movement of the center float tip part, the center float tip part A link body connected to the link body, a wire body that operates the hydraulic valve is connected to the link body, and the link body is rotated in conjunction with the vertical movement of the center float. A rice transplanter characterized by operating in the front-rear direction.   The rice transplanter according to claim 1, wherein the link body is rotatably supported by the planting frame body.

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