JP6612192B2 - Passenger rice transplanter - Google Patents

Description

  The present invention relates to a riding rice transplanter configured by connecting a planting machine to the rear part of a traveling machine body.

  The riding rice transplanter is configured by connecting a planting work machine to the rear part of the traveling machine body, and planting seedlings behind the traveling machine body, the wheel marks of the traveling machine body may affect the planting. Therefore, a wheel mark erasing device that is provided in a planting work machine and erases the wheel marks of the traveling machine body has been proposed. For example, Patent Document 1 discloses a wheel trace that includes a link mechanism that can be raised and lowered forward from a planting work machine, and a leveling member that is attached to the tip of the link mechanism while being biased downward. An eraser is disclosed.

Japanese Utility Model Publication No. 4-55216

  By the way, the planting work machine provided in this kind of riding rice transplanter has a planting depth adjustment mechanism that adjusts the planting depth of the seedling by the planting mechanism based on the vertical position change of the float, It is desirable to change the vertical position of the leveling member provided in the wheel mark erasing device according to the planting depth adjustment. However, if the wheel mark erasing device has a dedicated vertical position adjustment mechanism, the structure becomes complicated and the cost increases. Is a problem. In addition, it is proposed that a wheel mark erasing device is provided integrally with the float so that a dedicated vertical position adjustment mechanism is not required. However, in such a configuration, the wheel mark erasing device obstructs the surface following operation of the float. Besides, there is a possibility that the wheel mark erasing device is affected by the float surface following operation and the wheel mark erasing function cannot be exhibited well.

The present invention was created in view of the above-described circumstances in order to solve these problems, and the invention of claim 1 is configured by connecting a planting work machine to the rear part of the traveling machine body. The planting machine has a plurality of planter cases extending rearward from the horizontal frame at intervals in the left-right direction, and disposed along the left-right direction below the plurality of planter cases. Rotating float connecting shaft, a plurality of float support arms extending rearward and downward from the float connecting shaft with a space in the left-right direction, and a pivotable connection to the tip of each float support arm A plurality of floats and the float connecting shaft can be rotated, and the planting depth of the seedling by the planting mechanism is adjusted based on the vertical position change of the plurality of floats according to the rotation of the float connecting shaft Planting depth adjustment lever, And a wheel mark erasing device for erasing the wheel marks of the aircraft, and each wheel mark erasing device supports a leveling plate for erasing wheel marks, a support bracket for supporting the leveling plate, and a support bracket for swinging up and down. A parallel link mechanism that changes the vertical position of the leveling plate according to the rotation operation of the float connecting shaft by the planting depth adjustment lever, and a pressing force adjustment mechanism that adjusts the pressing force of the leveling plate against the paddy surface. It is characterized by.
Moreover, invention of Claim 2 is the riding rice transplanter of Claim 1, Comprising: The said leveling board is attached to a support bracket so that attachment or detachment is possible.
Moreover, invention of Claim 3 is the riding rice transplanter of Claim 1 or 2, Comprising: The said leveling board is a muddy water guide part which collects the muddy water ahead of a float, and the notch part which escapes the collected muddy water. It is characterized by providing.

According to the first aspect of the present invention, since the parallel link mechanism that changes the vertical position of the leveling plate according to the rotation operation of the float connecting shaft by the planting depth adjustment lever is provided, a dedicated vertical position adjustment mechanism is not provided. However, the leveling plate can be adjusted to an appropriate vertical position while maintaining the basic position of the leveling plate. In addition, since a pressing force adjusting mechanism that adjusts the pressing force of the leveling plate against the paddy surface is provided, a good wheel mark erasing function can be exhibited based on the pressing force adjustment according to the field conditions.
According to the second aspect of the present invention, since the leveling plate is detachably attached to the support bracket, it is easy to replace the leveling plate with a different shape depending on the specifications and field conditions.
According to the invention of claim 3, since the leveling plate includes a muddy water guide part for collecting muddy water in front of the float and a notch part for releasing the collected muddy water, the muddy water in front of the float is actively collected. In addition to suppressing the mud pushing by the float and the accompanying fluttering of the float by flowing it on the wheel marks, the mud pushing and the fluttering of the leveling board can be suppressed by letting the collected mud water escape from the notch. .

It is a top view of a riding rice transplanter. It is a rear view of a planting work machine. It is a front view of a planting work machine. It is a principal part top view which shows arrangement | positioning of the planter case and planting mechanism of a planting work machine. It is a principal part bottom view which shows arrangement | positioning of the planter case and planting mechanism of a planting work machine. It is a principal part perspective view which shows arrangement | positioning of the float of a planting work machine, and a wheel mark erasing apparatus. It is a principal part bottom view which shows arrangement | positioning of the float of a planting work machine, and a wheel mark erasing apparatus. It is a principal part side view which shows the attachment structure of the wheel mark erasing apparatus of a planting work machine. It is the perspective view which looked at the wheel mark erasing device from the front. It is the perspective view which looked at the wheel mark erasing device from the back. It is a principal part perspective view which shows the attachment structure of the nozzle for fertilization of a planting work machine. It is a principal part side view which shows the attachment structure of the nozzle for deep layer fertilization with respect to the 2 row planting planter case of a planting work machine. It is a principal part side view which shows the attachment structure of the nozzle for deep layer fertilization with respect to the single row planting planter case of a planting work machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 1 is a riding rice transplanter, and the riding rice transplanter 1 is connected to a rear portion of a traveling machine body 2 through a lifting link mechanism (not shown) and a seven-row planting work machine 3. It is configured. The traveling machine body 2 includes a planting PTO shaft (not shown) that outputs planting power, and the power output from the traveling machine body 2 is a flexible transmission shaft (not shown) with a universal joint (not shown) interposed therebetween. (Not shown) is transmitted to the planting machine 3.

  As shown in FIGS. 2 to 13, the planting work machine 3 includes a horizontal frame 5, a seedling stage 6, planter cases 7 </ b> A and 7 </ b> B, a planting mechanism 8, an input case 9, a planting transmission shaft 10, and a lateral feed speed change. A mechanism 11, a lateral feed shaft 12 and the like are provided. The horizontal frame 5 is a square cylindrical frame member disposed in the left-right direction on the planting work machine 3, and the rear end portion of the lifting link mechanism via a rolling shaft 13 protruding forward from the left-right center position. It is supported by the right and left rolling freely.

  The seedling mounting table 6 has a seedling mounting surface that is inclined in a low shape before and after the front height, and is slidably disposed above and below the planter cases 7A and 7B, and in the left-right direction according to the rotation of the lateral feed shaft 12. Horizontally fed. In addition, the seedling stage 6 is provided with a vertical feeding mechanism 14 that feeds the mat seedlings on the seedling mounting surface downward at the position where the lateral feeding is turned back.

  The planter cases 7 </ b> A and 7 </ b> B are arranged in parallel with a space in the left-right direction, and the front end portions are integrally supported by the horizontal frame 5. The planting mechanism 8 is provided on the rear side surface part of the planter cases 7A and 7B, scrapes the seedlings on the seedling placing stand 6 and plantes them in the field. More specifically, an apron 15 that functions as a lower limit stopper for the mat seedling placed on the seedling table 6 is disposed at the lower end of the seedling table 6, and the planting mechanism 8 is attached to the apron 15. The seedling is scraped off from the lower end portion of the mat seedling placed on the seedling placing stand 6 through a formed scraping port (not shown).

  The apron 15 can be changed in the vertical position, and the amount of seedling scraped by the planting mechanism 8 is adjusted based on the change in the vertical position. Specifically, when the position of the apron 15 is changed to the lower side, the amount of seedling scraped by the planting mechanism 8 increases, while when the position of the apron 15 is changed to the upper side, the seedling scraped by the planting mechanism 8 is scraped. The amount decreases. The planting work machine 3 is provided with a scraping amount adjusting lever 16 extending across the horizontal frame 5 and extending forward and forward. From the traveling machine body 2 side in a state where the planting work machine 3 is raised. When the scraping amount adjusting lever 16 is operated, the vertical position of the apron 15 is changed, and the scraping amount of the seedling by the planting mechanism 8 is adjusted.

  The planting work machine 3 is provided with a planting depth adjusting lever 17 that adjusts the planting depth of the seedling by the planting mechanism 8. The planting depth adjusting lever 17 is extended upward and forward across the horizontal frame 5 in the same manner as the scraping amount adjusting lever 16, and the planting work machine 3 is lifted up to the traveling machine body 2 side. When the planting depth adjustment lever 17 is operated from above, the vertical positions of the floats 18 and 19 arranged below the planter case 7 are changed, and the planting depth of the seedling by the planting mechanism 8 is adjusted accordingly. .

  The input case 9 is attached to the left and right intermediate part of the horizontal frame 5 and inputs power from the traveling machine body 2 side. As described above, the input shaft 9a of the input case 9 is connected to the planting PTO shaft on the traveling machine body 2 side via the flexible transmission shaft with the universal joint interposed therebetween. Considering the change in the bending angle of the universal joint, it is desirable that the mounting position of the input case 9 with respect to the horizontal frame 5 be as close as possible to the rolling shaft 13.

  The planting transmission shaft 10 is arranged in parallel below the horizontal frame 5 and transmits the power input by the input case 9 to the planter cases 7A and 7B and the lateral feed transmission mechanism 11. The lateral feed speed change mechanism 11 is a speed change mechanism interposed in the power transmission path to the lateral feed shaft 12, and the lateral feed speed of the seedling stage 6 can be adjusted by shifting the rotational speed of the lateral feed shaft 12. The transverse feed shaft 12 is a screw shaft having an endless helical groove on the outer periphery, and a transverse feed body 12a that reciprocates left and right on the shaft according to its rotation is provided, and a seedling is provided via the transverse feed body 12a. The platform 6 is laterally fed.

  Next, the arrangement configuration of the planter cases 7A, 7B and the like in the planting work machine 3 will be described mainly with reference to FIGS.

  The plurality of planter cases 7A and 7B include a double-planted planter case 7A having planting mechanisms 8 on both left and right sides of the planter case 7A, and a planting mechanism 8 on either one of the left and right sides of the planter case 7B. A single-planted planter case 7B is included, and the seven-planted planter 3 is composed of a combination of three double-planted planter cases 7A and one single-planted planter case 7B. . In the planting work machine 3 configured as described above, the spacing between the planter cases 7A and 7B becomes uneven, so that the single planting planter case 7B has the scraping amount adjusting lever 16 and the planting depth adjusting lever 17. Interfering with the input case 9 or the like may make it difficult to achieve a well-balanced arrangement configuration.

  Therefore, in the planting work machine 3 according to the present embodiment, the scraping amount adjustment lever 16 and the planting depth adjustment lever 17 are arranged on either the left or right side with respect to the left-right center (rolling shaft 13) of the planting work machine 3. The single-planted planter case 7B is arranged on either the left or right side of the right and left center of the planting work machine 3. In this way, the single planting planter case 7B and the adjusting levers (the scraping amount adjusting lever 16 and the planting depth adjusting lever 17) are arranged so as to be laterally distributed with respect to the left and right center of the planting work machine 3. Therefore, a well-balanced arrangement configuration is possible while avoiding interference between the single-planted planter case 7B and the adjusting levers.

  As shown in FIG. 4, in the planting work machine 3 of the present embodiment, two double-planting planter cases 7 </ b> A are arranged on one side with respect to the left and right center of the planting work machine 3, and the planting work machine 3. One double-planted planter case 7A and one single-planted planter case 7B are arranged on the other side with respect to the left and right center of each. In other words, the double-planted planter case 7A is arranged on the left and right outer sides of the planting work machine 3, and the double-planted planter case 7A and the single-planted planter case 7B are arranged on the left and right inner sides of the planting work machine 3.

  In the planting work machine 3 according to the present embodiment, when the single planting planter case 7B is arranged on either the left or right side with respect to the left and right center of the planting working machine 3, one side surface portion of the single planting planter case 7B is disposed. The planting mechanism 8 is arranged on the side surface facing the left and right center side of the planting machine 3. In this way, the mounting position of the input case 9 can be secured between the mounting position of the single-planted planter case 7B and the mounting position of the rolling shaft 13 in the horizontal frame 5, so that the single-planted planter case 7B and the input case 9 are secured. The input case 9 can be brought as close to the rolling shaft 13 as possible, and the change in the bending angle of the universal joint accompanying the rolling of the planting work machine 3 can be suppressed.

  Next, the floats 18 and 19 and the wheel mark erasing device 20 provided in the planting work machine 3 will be described mainly with reference to FIGS.

  The floats 18 and 19 include a center float 18 for leveling the planting positions for the central three strips and left and right side floats 19 for leveling the planting positions for the two outer strips. The center float 18 and the side float 19 level the planting position by sliding on the paddy field while swinging up and down with the swinging support shafts 18a and 19a as fulcrums. The center float 18 also functions as a sensing float that senses the height of the planting machine 3 relative to the rice field. That is, the center float 18 is connected to a hydraulic lift mechanism (not shown) on the traveling machine body 2 side via a connection mechanism (not shown), and the hydraulic lift mechanism is planted according to the vertical movement of the center float 18. By automatically raising and lowering 3, the height of the planting work machine 3 with respect to the rice field is kept substantially constant.

  The planting work machine 3 is provided with a planting depth adjusting mechanism 21 that changes the vertical position of the center float 18 and the side float 19 in accordance with the operation of the planting depth adjusting lever 17 described above. The planting depth adjusting mechanism 21 includes a rotatable float connecting shaft 22 disposed along the left-right direction below the plurality of planter cases 7A, 7B, and a float connecting shaft 22 spaced in the left-right direction. A plurality of float support arms 23 extending rearward and downward, and the center float 18 and the side float 19 are connected to the tip of each float support arm 23 through swing support shafts 18a and 19a so as to be swingable up and down. The float coupling shaft 22 can be rotated, and the planting depth of the seedling by the planting mechanism 8 can be adjusted based on the vertical position change of the center float 18 and the side float 19 according to the rotation of the float coupling shaft 22. The above-mentioned planting depth adjustment lever 17 to adjust is provided.

  The planting work machine 3 is provided with left and right wheel mark erasing devices 20 for erasing wheel marks of the traveling machine body 2 (travel marks of the rear wheel 2a). The left and right wheel mark erasing devices 20 are arranged behind the rear wheel 2 a and between the center float 18 and the side float 19 and slide on the surface while swinging up and down like the center float 18 and the side float 19. To level the wheel marks.

  The wheel mark erasing device 20 of the present embodiment includes a leveling plate 24 that erases wheel marks, a support bracket 25 that supports the leveling plate 24, a support bracket 25 that can swing up and down, and a planting depth adjustment lever. 17 includes a parallel link mechanism 26 that changes the vertical position of the leveling plate 24 according to the rotation operation of the float coupling shaft 22 by 17 and a pressing force adjustment mechanism 30 that adjusts the pressing force of the leveling plate 24 against the paddy surface.

  According to such a wheel mark erasing device 20, the parallel link mechanism 26 that changes the vertical position of the leveling plate 24 according to the rotation operation of the float connecting shaft 22 by the planting depth adjusting lever 17 is provided. Even if no vertical position adjusting mechanism is provided, the leveling plate 24 can be adjusted to an appropriate vertical position while maintaining the basic posture of the leveling plate 24. Moreover, by providing the pressing force adjusting mechanism 30 that adjusts the pressing force of the leveling plate 24 against the paddy surface, a good wheel mark erasing function can be exhibited based on the pressing force adjustment according to the field conditions. Hereinafter, each part of the wheel mark erasing device 20 will be described in detail.

  The leveling plate 24 includes an attachment portion 24a attached to the support bracket 25, an inclined plate portion 24b extending rearward and downward from the lower end of the attachment portion 24a, and a bottom plate portion 24c extending rearward from the lower end of the inclined plate portion 24b. , And a muddy water guide portion 24d extending forward from the left and right ends of the attachment portion 24a and the inclined plate portion 24b. According to the leveling plate 24 as described above, not only the wheel traces can be leveled by the inclined plate portion 24b and the bottom plate portion 24c, but also muddy water existing in front of the center float 18 and the side float 19 is actively received by the muddy water guide portion 24d. By collecting in the leveling plate 24, mud pushing by the center float 18 and the side float 19 and the accompanying fluttering of the center float 18 and the side float 19 can be suppressed.

  Further, the leveling plate 24 is formed with a notch 24e for allowing the collected muddy water to escape. Specifically, a plurality of notches 24e extending in the front-rear direction from the inclined plate portion 24b to the bottom plate portion 24c are formed at predetermined intervals in the left-right direction. According to such a leveling plate 24, mud pushing and fluttering of the leveling plate 24 can be suppressed by allowing the collected muddy water to escape from the notch 24e.

  The support bracket 25 includes a link connecting portion 25a connected to the parallel link mechanism 26, and a leveling plate support portion 25b extending forward from the link connecting portion 25a and supporting the leveling plate 24 at the tip thereof. The ground plate 24 is detachably attached to the leveling plate support portion 25b of the support bracket 25 via bolts B. According to the mounting structure of the leveling plate 24 as described above, replacement with the leveling plate 24 having a different shape according to the specification and the field conditions is facilitated.

  The parallel link mechanism 26 extends rearward and downward from the float coupling shaft 22, and has a lower link 27 that supports the support bracket 25 so that the support bracket 25 can swing up and down at its tip, and a swing range of the support bracket 25 at the rear end. And an upper link 28 to be defined. That is, since the front end portion of the lower link 27 that is a component of the parallel link mechanism 26 is integrally connected to the float connecting shaft 22, it corresponds to the turning operation of the float connecting shaft 22 by the planting depth adjusting lever 17. Thus, the vertical position of the leveling plate 24 can be changed.

  The rear end portion of the upper link 28 is connected to a connection hole 25c formed in the support bracket 25 via a pin 28a. The connecting hole 25c is an arc-shaped long hole centered on the swing support shaft 25d of the support bracket 25, and the support bracket 25 is allowed to swing within the range. On the other hand, the front end portion of the upper link 28 is supported by the planter cases 7A and 7B or the horizontal frame 5 via a support shaft 28b so as to be swingable up and down. For example, in the present embodiment, the front end portion of the upper link 28 provided in the right wheel mark erasing device 20 is supported by the support shaft 28b protruding from the side surface of the single-plant planter case 7B so as to be swingable up and down. The front end portion of the upper link 28 provided in the wheel mark erasing device 20 is supported by an extension bracket 29 extending rearward from the horizontal frame 5 so as to be vertically swingable.

  The pressing force adjusting mechanism 30 has one end locked to the support bracket 25 and the other end locked to the lower link 27, whereby a torsion coil spring 30a for biasing the support bracket 25 downward, and the support bracket And a plurality of locking grooves 25e that can selectively lock one end of the torsion coil spring 30a. According to such a pressing force adjusting mechanism 30, it is possible to adjust the pressing force of the leveling plate 24 against the surface by selectively changing the locking groove 25e that locks one end of the torsion coil spring 30a. Become.

  Next, the fertilizer application nozzles 31 </ b> A, 31 </ b> B, 32 </ b> A, and 32 </ b> B provided in the planting work machine 3 will be described mainly with reference to FIGS. 11 to 13.

  The planting work machine 3 includes a plurality of side fertilizer application nozzles 31A and 31B that discharge paste fertilizer into the soil near the side of each planting position, and a side fertilizer application nozzle 31A between adjacent planting positions. , 31B and a plurality of deep layer fertilizer nozzles 32A and 32B for discharging paste fertilizer at a deeper layer than 31B are provided, and side row fertilization and deep layer fertilization can be performed simultaneously with planting of seedlings.

  However, in the seven-plant planting work machine 3, the two-plant planter case 7B having the planting mechanisms 8 on the left and right sides of the rear part of the planter case 7A and the left and right side parts of the rear part of the planter case 7A are planted. Since the single planting planter case 7B having the mechanism 8 is mixed and the spacing between the planter cases 7A and 7B becomes uneven, it is difficult to arrange the side fertilizer application nozzles 31A and 31B and the deep fertilizer application nozzles 32A and 32B. In addition, there is a risk that the amount of fertilization will be excessive or insufficient.

  In this embodiment, when the side row fertilizer application nozzles 31 </ b> A and 31 </ b> B and the deep layer fertilizer application nozzles 32 </ b> A and 32 </ b> B are arranged on the seven-plant planting work machine 3, In the attachment position, the seedling mechanism 8 of the two-planted planter case 7A and the single-planted planter case 7B is planted with three seedlings, and the planting position for the two outer strips leveled by the left and right side floats 19 Shall plant two seedlings by the planting mechanism 8 of the two-plant planter case 7A.

  Further, the side-row fertilizer application nozzle 31A provided corresponding to the planting mechanism 8 of the double-planted planter case 7A is integrated with the two filaments, and the center float 18 is arranged immediately below the double-planted planter case 7A. Or it is provided in the side float 19 (refer FIG. 6). The center float 18 and the side float 19 include a cylindrical nozzle support tube 33A extending in the left-right direction, and a nozzle connection shaft 34A that is rotatably inserted into the nozzle support tube 33A. Side fertilizer application nozzles 31A are attached to both ends. Further, a fertilization depth adjusting mechanism 35A for adjusting the fertilization depth (including storage) of the side strip fertilization nozzle 31A is provided at one end of the nozzle support cylinder 33A.

  Nozzle 32A for deep layer fertilization provided corresponding to the planting mechanism 8 of the double-planted planter case 7A is provided at the center of the left and right of the double-planted planter case 7A. At the front end of the double-planted planter case 7A, a bracket 36A having a U-shape in plan view and a nozzle support shaft 37A that is rotatably supported by the bracket 36A in the left-right direction are provided. A deep layer fertilizer nozzle 32A is attached to the center of the support shaft 37A. Further, a fertilization depth adjustment mechanism 38A for adjusting the fertilization depth (including storage) of the deep layer fertilization nozzle 32A is provided between the nozzle support shaft 37A and one side surface of the double-planting planter case 7A. ing.

  On the other hand, the deep-layer fertilizer application nozzle 31B provided corresponding to the planting mechanism 8 of the single-plant planter case 7B is offset from the left and right center of the single-plant planter case 7B to the planting mechanism 8 side. At the front end of the single planter planter case 7B, a bracket 36B having a U-shape in plan view and a nozzle support shaft 37B that is rotatably supported by the bracket 36B in the left-right direction are provided. A deep fertilizer application nozzle 32B is attached to one end of the support shaft 37B. Further, a fertilization depth adjusting mechanism 38B for adjusting the fertilization depth (including storage) of the deep layer fertilization nozzle 32B is provided between the nozzle support shaft 37B and one side surface of the single planting planter case 7B. ing.

  The side-row fertilizer application nozzle 31B provided corresponding to the planting mechanism 8 of the single-plant planter case 7A is located on the opposite side of the deep-layer fertilization nozzle 32B across the planting mechanism 8 in the left-right direction, and the center float 18 (Or side float 19) (see FIG. 6). The center float 18 includes a cylindrical nozzle support tube 33B extending in the left-right direction, and a nozzle connection shaft (not shown) that is rotatably inserted into the nozzle support tube 33B, and has one end of the nozzle connection shaft. A side fertilizer application nozzle 31B is attached to the part. Moreover, the fertilization depth adjustment mechanism 35B for adjusting the fertilization depth (including storage) of the nozzle 31B for side strip fertilization is provided in the one end part of the nozzle support cylinder 33B.

  According to the arrangement of the fertilizer application nozzles 31A, 31B, 32A, 32B as described above, the deep fertilizer application nozzle 32B provided corresponding to the planting mechanism 8 of the single-plant planter case 7B is a single-plant planter case. 7B is offset from the center of the left and right to the planting mechanism 8 side, so that efficient deep layer fertilization can be performed in the single-plant planter case 7B.

  Further, since the side-row fertilizer application nozzle 31B provided corresponding to the planting mechanism 8 of the single-plant planter case 7B is located on the opposite side of the deep-layer fertilization nozzle 32B across the planting mechanism 8 in the left-right direction, Interference with the offset deep fertilizer application nozzle 32B can be avoided.

  Further, the deep layer fertilizer nozzle 32B corresponding to the single-plant planter case 7B is provided in the planter case 7B similarly to the deep-layer fertilizer nozzle 32A corresponding to the double-plant planter case 7A, and corresponds to the single-plant planter case 7B. The side row fertilizer application nozzle 31B is provided in the center float 18 or the side float 19 in the same manner as the side row fertilizer application nozzle 31A corresponding to the double-planted planter case 7A. Therefore, the deep layer fertilizer corresponding to the single-planted planter case 7A is provided. It is possible to share many parts between the nozzle 32A for side application and the nozzle 31A for side fertilization, and the nozzle 32B for deep layer fertilization and the nozzle 31B for side fertilization corresponding to the double planting planter case 7B. .

  The amount of fertilizer discharged from the deep-layer fertilizer nozzle 32B provided corresponding to the single-plant planter case 7B is suppressed more than the amount of fertilizer discharged from the deep-layer fertilizer nozzle 32A provided corresponding to the double-planted planter case 7A. Is preferred. That is, the deep layer fertilizer nozzle 32A provided corresponding to the two-plant planter case 7A performs deep layer fertilization for two strips, whereas the deep-layer fertilizer nozzle 32B provided corresponding to the single-plant planter case 7B. Since the deep layer fertilization is performed for one line, the fertilizer discharge amount of the deep layer fertilizer nozzle 32B provided corresponding to the single line planter case 7B is provided corresponding to the double line planter case 7A. By suppressing the amount of fertilizer discharged from the deep layer fertilizer nozzle 32A, excessive deep layer fertilization on seedlings planted in the single-plant planter case 7B can be avoided.

  According to the present embodiment configured as described, the riding rice transplanter 1 is configured by connecting the planting work machine 3 to the rear part of the traveling machine body 2, and the planting work machine 3 is spaced in the left-right direction. A plurality of planter cases 7A, 7B extending rearward from the horizontal frame 5, and a rotatable float connecting shaft 22 disposed along the left-right direction below the plurality of planter cases 7A, 7B; A plurality of float support arms 23 extending rearward and downward from the float connection shaft 22 with a space in the left-right direction, and a plurality of floats 18 and 19 connected to the tip of each float support arm 23 so as to be swingable up and down. The float connecting shaft 22 can be rotated, and the planting depth of the seedling by the planting mechanism 8 is adjusted based on the change in the vertical position of the floats 18 and 19 according to the rotation of the float connecting shaft 22. Planting depth adjustment lever 1 And a wheel mark erasing device 20 for erasing the wheel marks of the traveling machine body 2. Each wheel mark erasing device 20 includes a leveling plate 24 for erasing the wheel marks, a support bracket 25 for supporting the leveling plate 24, and a support bracket 25. And a parallel link mechanism 26 that changes the vertical position of the leveling plate 24 in accordance with the rotation operation of the float connecting shaft 22 by the planting depth adjustment lever 17. Even if no vertical position adjusting mechanism is provided, the leveling plate 24 can be adjusted to an appropriate vertical position while maintaining the basic posture of the leveling plate 24. Moreover, since the pressing force adjustment mechanism 30 that adjusts the pressing force of the leveling plate 24 against the paddy surface is provided, a good wheel mark erasing function can be exhibited based on the pressing force adjustment according to the field conditions.

  Moreover, since the leveling board 24 is attached to the support bracket 25 so that attachment or detachment is possible, replacement | exchange with the leveling board 24 from which a shape differs according to a specification and agricultural field conditions becomes easy.

  Further, since the leveling plate 27 includes a muddy water guide portion 24d for collecting muddy water in front of the floats 18 and 19, and a notch portion 24e for releasing the collected muddy water, the muddy water in front of the floats 18 and 19 is actively collected. In addition to the mud being pushed by the floats 18 and 19 and the accompanying fluttering of the floats 18 and 19, the collected muddy water is allowed to escape from the notch 24 e, so that the ground leveling plate 24 Mud pushing and fluttering can be suppressed.

DESCRIPTION OF SYMBOLS 1 Riding rice transplanter 2 Traveling machine body 3 Planting work machine 5 Horizontal frame 6 Seedling stand 7A Two-row planter case 7B Single-plant planter case 8 Planting mechanism 10 Planting transmission shaft 13 Rolling shaft 16 Scraping amount adjusting lever 17 Planting depth adjusting lever 18 Center float 19 Side float 20 Wheel mark erasing device 22 Float connection shaft 23 Float support arm 24 Leveling plate 24d Mud guide 24e Notch 25 Support bracket 26 Parallel link mechanism 30 Pressure adjusting mechanism 31A, 31B Nozzle for side fertilization 32A, 32B Nozzle for deep layer fertilization

Claims (3)

A riding rice transplanter configured by connecting a planting machine to the rear of the traveling machine body,
The planting machine is
A plurality of planter cases extending rearward from the horizontal frame at intervals in the left-right direction;
A rotatable float connecting shaft disposed along the left-right direction below the plurality of planter cases;
A plurality of float support arms extending rearwardly and downwardly from the float connecting shaft at intervals in the left-right direction;
A plurality of floats coupled to the tip of each float support arm so as to be swingable up and down;
A planting depth adjusting lever that is capable of rotating the float connecting shaft, and that adjusts the planting depth of the seedling by the planting mechanism based on the vertical position change of the plurality of floats according to the rotation of the float connecting shaft; ,
A wheel mark erasing device for erasing the wheel marks of the traveling machine body,
Each wheel mark erasing device
A leveling plate that erases the wheel marks,
A support bracket for supporting the leveling plate;
A parallel link mechanism that supports the support bracket so that it can swing up and down, and changes the vertical position of the leveling plate according to the rotation operation of the float connecting shaft by the planting depth adjustment lever;
A riding rice transplanter comprising: a pressing force adjusting mechanism that adjusts a pressing force of the leveling plate against the field surface.   The riding rice transplanter according to claim 1, wherein the leveling plate is detachably attached to a support bracket. The leveling plate is
A muddy water guide for collecting muddy water in front of the float;
The riding rice transplanter according to claim 1, further comprising: a notch that allows the collected muddy water to escape.

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