JP6737685B2 - Rice transplanter - Google Patents

Description

The present invention relates to a rice transplanter equipped with a seedling planting device that scrapes off seedlings from a seedling mat placed on a seedling placing table with a planting claw to plant them in a field.

BACKGROUND ART Conventionally, in rice transplanters used for seedling planting work in a field, a seedling planting device having a seedling platform and a transplantation mechanism with a planting claw is attached to the rear part of the traveling machine body. As a transplantation mechanism of the seedling planting apparatus, a type having two rotary nails in one rotary case is generally used. In this case, when the rotary case makes one revolution, each of the two planting claws makes one revolution in the opposite direction with respect to the rotary case. That is, each planting claw has a structure that revolves around the axis of rotation of the rotary case while revolving.

In the seedling planting work, by intermittently traversing the seedling placing table on which the seedling mat is placed at predetermined intervals, by rotating the planting claws toward the seedling placing table around the axis of the rotary case while revolving. The planting claws are reciprocated between the seedling mounting table and the field scene, and one seedling is scraped from the seedling mat and planted in the field.

The seedling mat used in the seedling planting work by the rice transplanter has seed paddy on the floor soil laid in a rectangular nursery box with an inner diameter of about 580 mm (length) x about 280 mm (width) x about 30 mm (height). The seeds are sown, germinated in a state of being covered with soil, and then raised to give a mat. As the type of seedling mat, in addition to a standard type seedling mat for seedling seeding of about 100 g to 130 g per one seedling raising box, the seeding seed seeding amount for one seedling raising box is, for example, about 200 g to 300 g. A seedling mat for high-density seedling raising is known (see, for example, Patent Document 1).

The seedling mats for high-density seedlings are more densely grown than the standard-type seedling mats. When using the seedling mat for high-density seedlings, the area where the planting claws scrape the seedling mat from the seedling mat so that the number of seedlings scraped by the planting claw is appropriate compared to when using the standard type seedling mat Is reduced. As a result, the number of seedling mats required for the rice planting work per unit area can be reduced and the economical efficiency is improved.

Japanese Unexamined Patent Application Publication No. 2015-043731

When using seedling mats for high-density seedlings, the planting nails for high-density seedlings that are narrower than those for standard-type seedlings are used so that the area where the planting nails scrape off the seedling mats is small. .. Also, the take-out port cover, which has an opening groove through which the planting claws pass, at the seedling taking-out port of the seedling taking-out plate arranged below the seedling placing table is relatively narrow in accordance with the planting claws for high-density seedling raising. An outlet cover for high-density seedling raising having an opening groove is used. Here, regarding the planting claw width of the planting claw for high-density seedling raising and the opening groove width of the take-out cover, if the planting claw width and the opening groove width for standard type seedling raising are simply reduced at the same ratio, There was a problem that the seedlings could not be scraped appropriately, such as the seedlings being clogged in the gap between the artificial nail and the opening groove.

The present invention has been made in view of the above situation, and has a technical problem of appropriately setting a gap between the planting claw and the opening groove when passing through the opening groove of the outlet cover.

A rice transplanter according to the present invention is a rice transplanter equipped with a seedling planting device that scrapes off seedlings from a seedling mat placed on a seedling mounting table with a planting nail detachably attached to a nail case and planted in a field. , A detachment cover having an opening groove through which the planting nail passes is detachably attached to a seedling harvesting port of a seedling removing plate disposed below the seedling mounting table, and the set of the planting claw and the harvesting port cover A set of a planting claw having a planting claw width WA and an outlet cover having an opening groove width ΔWa, or a planting claw having a planting claw width WB wider than the planting claw width WA and the opening groove width ΔWa. Can be replaced with a set of outlet cover having a wider opening groove width ΔWb, and the gap ΔWa-WA, which is the difference between the planting claw width WA and the opening groove width ΔWa, is the same as the planting claw width WB. that is largely or same size than the gap ΔWb-WB is a difference between the opening groove width DerutaWb is also of a.

In the rice transplanter of the present invention, the gap ΔWa-WA may be larger than the gap ΔWb-WB. However, the gap ΔWa-WA may be the same as the gap ΔWb-WB or may be smaller than the gap ΔWb-WB.
Further, in the rice transplanter of the present invention, the gap ΔWa-WA may be made larger than the value of the product of the gap ΔWb-WB and the reduction ratio WA/WB.

The rice transplanter of the present invention is a rice transplanter equipped with a seedling planting device that scrapes a seedling from a seedling mat placed on a seedling mounting table with a planting nail detachably attached to a nail case and planted in a field, At the seedling take-out port of the seedling take-out plate arranged below the seedling placing table, a take-out port cover having an opening groove through which the planting claw passes is detachably attached, and a set of the planting claw and the take-out port cover is attached. , A set of a planting claw having a planting claw width WA and an outlet cover having an opening groove width ΔWa, or a planting claw having a planting claw width WB wider than the planting claw width WA and the opening groove width ΔWa Can be replaced with a set of outlet covers having a wide opening groove width ΔWb, and the gap ΔWa-WA, which is the difference between the planting claw width WA and the opening groove width ΔWa, is equal to the planting claw width WB and the opening. Since the gap width ΔWb, which is the difference between the groove widths ΔWb, is made larger or the same as the gap width ΔWb-WB , seedlings are clogged in the gap between the planting claw and the opening groove when using a narrow claw and cover set. Can be more reliably prevented, and the planting nail can more appropriately scrape one seedling from the seedling mat while reducing the area where the planting nail scrapes the seedling mat.

In the rice transplanter of the present invention, if the gap ΔWa-WA is set to be larger than the product value of the gap ΔWb-WB and the reduction ratio WA/WB, the planting of the wide claw and the cover set is performed. Compared with the case where the nail width WB and the opening groove width ΔWb are reduced at the same reduction ratio to set the narrow nail width WA and the opening groove width ΔWa of the cover set, the clearance between the nail width and the opening groove is reduced. ΔWa-WA can be widened and seedlings can be prevented from being clogged in the gap. If a narrow claw and cover set are used, it is possible to appropriately scrape one seedling from the seedling mat while having a structure in which the area where the planting claw scrapes the seedling mat can be reduced.

It is a left side view of the riding type rice transplanter in the embodiment. It is a top view of a riding type rice transplanter. FIG. 3 is a left side view showing a positional relationship between an engine, a mission case and a rear axle case. FIG. 3 is a plan view showing a positional relationship between an engine, a mission case and a rear axle case. It is a top view of the driving operation part which omitted a steering wheel. It is a drive system diagram of a riding type rice transplanter. It is a hydraulic circuit diagram of a riding type rice transplanter. It is a left side view of a seedling planting device. It is a front view of a seedling planting device. It is a top view of a seedling planting device. It is a top view for explaining the planting depth control axis and the seedling taking control axis circumference. It is a left side sectional view for explaining seedling vertical adjustment. It is a top view of the surroundings of the seedling take-out port. It is a top view of a transplant mechanism. It is a left side view of a transplant mechanism. It is a rear view which shows a nail|claw guide structure with a plant. It is a separation perspective view of a planting nail guide structure. It is a figure showing an outlet cover and a planting nail guide, (A) shows an outlet cover for high-density seedling raising, and (B) shows an outlet cover for standard type seedling raising. It is a separation perspective view which shows the attachment/detachment structure of a planting nail and an extrusion piece. It is a front view, a top view, and a left side view of a planting nail, an extruded piece, and a push rod, (A) shows for high-density seedling raising, and (B) shows a standard type raising seedling. It is a figure which shows the planting nail for high-density seedling raising, Comprising: (A) top view, (B) left side sectional drawing, (C) front view, and (D) bottom view. It is a figure which shows the planting nail for standard-type seedling raising, Comprising: (A) Plan view, (B) Left side sectional view, (C) Front view, and (D) Bottom view. It is a top view which expands and shows the nail|claw part nail root part of a planting nail, (A) shows for high-density seedling raising, (B) shows for standard type|mold raising. It is a top view which shows the take-out port cover for high-density seedling raising, and the periphery of a planting nail. It is a top view which shows the take-out port cover for standard type seedling raising, and the circumference|surroundings of a planting nail.

Hereinafter, an embodiment in which the invention of the present application is embodied will be described with reference to the drawings in the case of being applied to an eight-row planting type rice transplanter 1 (hereinafter, simply referred to as rice transplanter 1). In the following description, the left side in the traveling direction of the traveling machine body 2 is simply referred to as the left side, and the right side in the traveling direction is also simply referred to as the right side.

First, an outline of the rice transplanter 1 will be described with reference to FIGS. 1 to 5. The rice transplanter 1 of the embodiment includes a traveling machine body 2 supported by a pair of left and right front wheels 3 and a pair of left and right rear wheels 4 as a traveling unit. An engine 5 is mounted on the front part of the traveling machine body 2. The traveling machine body 2 is configured to travel forward and backward by transmitting power from the engine 5 to the rear transmission case 6 and driving the front wheels 3 and the rear wheels 4. A front axle case 7 is projected to the left and right sides of the mission case 6, and a front wheel 3 is steerably attached to a front axle 36 extending outward from the front axle case 7 in the left and right directions. The tubular frame 8 is projected to the rear of the mission case 6, the rear axle case 9 is fixedly mounted on the rear end side of the tubular frame 8, and the rear wheel 4 is attached to the rear axle 37 that extends outward from the rear axle case 9 in the left and right directions. ing.

As shown in FIGS. 1 and 2, a work step (body cover) 10 for boarding an operator is provided on the upper surfaces of the front and center portions of the traveling machine body 2. A front bonnet 11 is arranged above the front part of the work step 10, and the engine 5 is installed inside the front bonnet 11. A travel transmission pedal 12 for stepping operation is arranged on the upper side of the work step 10 on the rear side of the front hood 11. Although details are omitted, the rice transplanter 1 of the embodiment adjusts the shift power output from the hydraulic continuously variable transmission 40 of the mission case 6 by driving the shift electric motor according to the depression amount of the traveling shift pedal 12. Is configured to.

Further, a steering handle 14, a traveling main speed change lever 15, and a work lever 16 as a lifting/lowering operation tool are provided on the driving operation unit 13 on the rear upper surface side of the front bonnet 11 (see FIG. 5). A control seat 18 is arranged behind the front bonnet 11 on the upper surface of the work step 10 via a seat frame 17. In addition, on the left and right sides of the front bonnet 11, left and right preliminary seedling mounts 24 are provided with the work step 10 interposed therebetween.

A link frame 19 is erected at the rear end of the traveling machine body 2. A seedling planting device 23 for eight-row planting is connected to the link frame 19 via a lifting link mechanism 22 composed of a lower link 20 and a top link 21 so as to be liftable. In this case, a hitch bracket 38 is provided on the front side of the seedling planting device 23 via a rolling fulcrum shaft (not shown). By connecting the hitch bracket 38 to the rear side of the elevating link mechanism 22, the seedling planting device 23 is arranged in the rear of the traveling machine body 2 so that it can be moved up and down. A cylinder base end side of a hydraulic lifting cylinder 39 (a lifting control mechanism) is supported by a rear portion of an upper surface of the tubular frame 8 so as to be vertically rotatable. The rod tip side of the lifting cylinder 39 is connected to the lower link 20. As a result of the elevating cylinder 39 expanding and contracting to vertically rotate the elevating link mechanism 22, the seedling planting device 23 moves up and down. The seedling planting device 23 is configured to be rotatable about the rolling fulcrum axis so that the inclination posture in the left-right direction can be changed.

The operator gets on the work step 10 from the boarding/alighting step 25 on the side of the work step 10 and drives the seedling planting device 23 to move the seedling planting machine 23 to plant the seedlings in the field while moving in the field by a driving operation. Perform work (rice planting work). During the seedling planting operation, the seedling planting device 23 is supplied with an operator's seedling mat on the spare seedling mounting table 24 at any time.

As shown in FIG. 1 and FIG. 2, the seedling planting device 23 includes a planting input case 26 to which power is transmitted from the engine 5 via the mission case 6, and a four-row four-section connecting to the planting input case 26. Sets (1 set of 2 articles) with planting transmission cases 27, seedling planting mechanism 28 provided on the rear end side of each planting transmission case 27, seedling mounting table 29 for 8 rows planting, and each planting The float 32 for leveling the field is provided on the lower surface side of the transmission case 27. The seedling planting mechanism 28 is provided with a planting transmission case 27 having two planting claws 30 for one row. Two planted transmission cases 27 are arranged in the planted transmission case 27. By one rotation of the output shaft of the planted transmission case 27, the two planting claws 30 cut out and grab the seedlings of each plant, and plant the seedlings on the leveled rice field with the float 32. On the front side of the seedling planting device 23, a leveling rotor 85 for leveling (leveling) the field scene is provided so that it can be moved up and down. As shown in FIG. 20, the seedling planting apparatus 23 is provided with a box application agent sprayer (chemical sprayer) 400 that sprays the box application agent onto the seedling mats placed on the seedling placement table 29.

Although details will be described later, the power from the engine 5 via the mission case 6 is transmitted not only to the front wheels 3 and the rear wheels 4 but also to the planting input case 26 of the seedling planting device 23. In this case, the power from the mission case 6 toward the seedling planting device 23 is once transmitted to the inter-plant gear shift case 75 provided on the upper right side of the rear axle case 9, and then from the inter-plant gear shift case 75 to the planting input case 26. It The seedling planting mechanism 28 and the seedling placing table 29 are driven by the transmitted power. The inter-plant speed change case 75 has a built-in inter-plant speed change mechanism 76 for switching between planted seedlings, for example, sparse planting, standard planting, or dense planting, and a planting clutch 77 for interrupting power transmission to the planting plant 23. (See FIG. 6).

Line markers 33 are provided on the left and right outside of the seedling planting device 23. The line marker 33 has a marker wheel 34 for muscle pulling, and a marker arm 35 that rotatably supports the marker wheel 34. The base end side of each marker arm 35 is pivotally supported on the left and right outside of the seedling planting device 23 so as to be rotatable left and right. The line marker 33 is based on the operation of the work lever 16 provided in the driving operation unit 13, and has a work posture in which a reference locus in the next step is landed on the rice field and is formed, and the marker wheel body 34 is lifted to separate from the rice field. It is configured to be rotatable in the non-working posture.

As shown in FIGS. 3 and 4, the traveling machine body 2 includes a pair of left and right machine body frames 50 extending in the front-rear direction. Each body frame 50 is divided into a front frame 51 and a rear frame 52. The rear end portion of the front frame 51 and the front end portion of the rear frame 52 are welded and fixed to the laterally long horizontally-intermediate connecting frame 53. The front ends of the pair of left and right front frames 51 are welded and fixed to the front frame 54. The rear end sides of the pair of left and right rear frames 52 are fixed to the rear frame 55 by welding. The front frame 54, the left and right front frames 51, and the intermediate coupling frame 53 are each formed in a rectangular frame shape in a plan view. Similarly, the intermediate connecting frame 53, the left and right rear frames 52, and the rear frame 55 are also formed in a rectangular frame shape in plan view.

As shown in FIG. 4, the front parts of the left and right front frames 51 are connected by two front and rear base frames 56. An intermediate portion of each base frame 56 is formed in a U-shaped shape so as to be positioned lower than the left and right front frames 51. The left and right ends of each base frame 56 are welded and fixed to the corresponding front frame 51. The engine 5 is mounted on and supported by the front and rear base frames 56 via a substantially flat engine base 57 and a plurality of anti-vibration rubbers (not shown). The rear base frame 56 is connected to the front portion of the mission case 6 via a rear relay bracket 60.

As can be seen from FIG. 4, the rear portions of the left and right front frames 51 are connected to the front axle case 7 protruding to the left and right sides of the mission case 6. The left and right ends of a U-shaped frame 61 extending obliquely downward and rearward in a side view are fixed to the center of the intermediate coupling frame 53 by welding. An intermediate portion of the U-shaped frame 61 is connected to an intermediate portion of the tubular frame 8 that connects the transmission case 6 and the rear axle case 9 (see FIGS. 3 and 4). The upper ends of the left and right vertical frames 62 are welded and fixed to the middle portion of the rear frame 55. To the lower ends of the left and right vertical frames 62, the middle parts of the left and right horizontally long rear axle support frames 63 are fixed by welding. The left and right ends of the rear axle support frame 63 are connected to the rear axle case 9. A muffler 65 that reduces exhaust noise of the engine 5 is disposed below the step support base 64 that projects outward from the left front frame 51.

As shown in FIGS. 3 and 4, a power steering unit 66 is provided in the front part of the mission case 6 arranged behind the engine 5. Although not described in detail, the handle shaft is rotatably arranged inside the handle post that is erected on the upper surface of the power steering unit 66. The steering handle 14 is fixed to the upper end side of the handle shaft. A steering output shaft (not shown) projects downward from the lower surface of the power steering unit 66. Steering rods 68 (see FIG. 4) for steering the left and right front wheels 3 are connected to the steering output shafts.

The engine 5 of the embodiment is arranged on the intermediate portion of the front and rear base frames 56 with the output shaft 70 (crank shaft) oriented in the left-right direction. The left and right widths of the engine 5 and the engine base 57 are smaller than the inner dimension between the left and right front frames 51, and the lower side of the engine 5 and the engine base 57 are arranged on the intermediate portions of the front and rear base frames 56. Thus, it is exposed below the left and right front frames 51. In this case, the output shaft 70 (axis line) of the engine 5 is at a position overlapping the left and right front frames 51 in a side view. An exhaust pipe 69 that communicates with an exhaust system of the engine 5 is arranged on one left and right side surfaces (the left side surface in the embodiment) of the engine 5. The base end side of the exhaust pipe 69 is connected to each cylinder of the engine 5, and the tip end side of the exhaust pipe 69 is connected to the exhaust inlet side of the muffler 65.

In the driving operation unit 13 shown in FIG. 5, the traveling main speed change lever 15 is located on one of the left and right sides (in the embodiment, the left side) with the steering handle 14 interposed therebetween. Along the guide groove 83 formed in the driving operation unit 13. The operation mode of the rice transplanter 1 is configured to be switched between forward, neutral, reverse, seedling splicing, and movement modes by operating the traveling main transmission lever 15. The work lever 16 sandwiches the control handle 14. The work lever 16 is located on the other side (right side in the embodiment) of the plurality of operations such as the raising/lowering operation of the seedling planting device 23, the connection/disconnection operation of the planting clutch 77, and the selection operation of the left/right line markers 33. It is configured to be operated independently in the cross direction.

In this case, when the work lever 16 is tilted forward one time, the seedling planting device 23 is lowered, and when it is tilted one more forward, the planting clutch 77 is engaged (operated state). On the contrary, when the work lever 16 is tilted backward once, the planting clutch 77 is disengaged (in a power-off state), and when tilted again backward, the seedling planting device 23 is raised. When stopping the lifting operation of the seedling planting device 23, the work lever 16 is tilted in the opposite direction. For example, when stopping the descending movement of the seedling planting device 23 on the way, the work lever 16 may be tilted backward. When the work lever 16 is tilted once to the left, the left line marker 33 is in the working position, and when it is tilted to the left again, the left line marker 33 is returned to the non-working position. When the work lever 16 is tilted to the right once, the right line marker 33 is in the working position, and when it is tilted to the right again, the right line marker 33 is returned to the non-working position.

Next, the drive system of the rice transplanter 1 will be described with reference to FIG. The output shaft 70 of the engine 5 projects outward from the left and right side surfaces of the engine 5. An engine output pulley 72 is provided on a projecting end portion of the output shaft 70 projecting from the left side surface of the engine 5, and a mission input pulley 73 is provided on a mission input shaft 71 projecting leftward from the mission case 6 and transmitted to both pulleys 72, 73. I am wearing a belt. Power is transmitted from the engine 5 to the transmission case 6 via both pulleys 72, 73 and the transmission belt.

In the mission case 6, the hydraulic continuously variable transmission 40 including the hydraulic pump 40a and the hydraulic motor 40b, the planetary gear device 41, the hydraulic continuously variable transmission 40, and the transmission power via the planetary gear device 41 are shifted in multiple stages. A gear type auxiliary transmission mechanism 42, a main clutch 43 for connecting and disconnecting power transmission from the planetary gear unit 41 to the gear type auxiliary transmission mechanism 42, a traveling brake 44 for braking output from the gear type auxiliary transmission mechanism 42, and the like. ing. The hydraulic pump 40a is driven by the power from the mission input shaft 71, the hydraulic oil is supplied from the hydraulic pump 40a to the hydraulic motor 40b, and the shift power is output from the hydraulic motor 40b. The speed change power of the hydraulic motor 40b is transmitted to the gear type auxiliary speed change mechanism 42 via the planetary gear unit 41 and the main clutch 43. Then, from the gear type auxiliary transmission mechanism 42, power is transmitted by branching in two directions of the front and rear wheels 3, 4 and the seedling planting device 23.

A part of the branch power toward the front and rear wheels 3 and 4 is transmitted from the gear type auxiliary transmission mechanism 42 to the front axle 36 of the front axle case 7 via the differential gear mechanism 45 to drive the front left and right wheels 3 to rotate. .. The rest of the branch power toward the front and rear wheels 3, 4 is transmitted from the gear type auxiliary transmission mechanism 42 via a universal joint shaft 46, a rear drive shaft 47 in the rear axle case 9, a pair of left and right friction clutches 48, and a gear type reduction mechanism 49. Is transmitted to the rear axle 37 of the rear axle case 9 to rotate the left and right rear wheels 4. When the traveling brake 44 is actuated, the output from the gear type auxiliary transmission mechanism 42 disappears, so that the front and rear wheels 3 and 4 are braked. When the rice transplanter 1 is turned, the friction clutch 48 on the inside of the turn in the rear axle case 9 is disengaged to freely rotate the rear wheel 4 on the inside of the turn, and the rear wheel 4 on the outside of the turn to which power is transmitted is rotated. It turns by driving.

Inside the rear axle case 9, there is provided a rotor drive unit 86 having a leveling rotor clutch for connecting/disconnecting power to the leveling rotor 85. The power transmitted from the gear type auxiliary transmission mechanism 42 to the universal joint shaft 46 is also branched and transmitted to the rotor drive unit 86, and is transmitted from the rotor drive unit 86 to the leveling rotor 85 via the universal joint shaft 87. By rotating the leveling rotor 85, the field scene is leveled.

The branch power toward the seedling planting device 23 is transmitted to the inter-plant shift case 75 via the PTO transmission shaft mechanism 74 with the universal joint shaft. In the inter-plant speed change case 75, an inter-plant speed change mechanism 76 for switching between the plants of the seedlings to be planted, for example, sparse planting, standard planting or dense planting, and a planting clutch 77 for interrupting power transmission to the planting plant 23 are provided. I have it. The power transmitted to the inter-stock transmission case 75 is transmitted to the planted input case 26 via the inter-stock transmission mechanism 76, the planted clutch 77 and the universal joint shaft 78.

In the input case 26 with planting, a seedling table lateral feeding mechanism 79 for laterally moving the seedling placing table 29, a seedling vertical feeding mechanism 80 for vertically feeding the seedling mat on the seedling placing table 29, and a planting input case. 26, and a planted output shaft 81 that transmits power from 26 to each planted transmission case 27. By the power transmitted to the planted input case 26, the seedling table horizontal feed mechanism 79 and the seedling vertical feed mechanism 80 are driven to continuously and reciprocally move the seedling placement table 29 in a reciprocating manner, and the seedling placement table 29 reciprocates. When the end (return point of reciprocating movement) is reached, the seedling mat on the seedling mounting table 29 is intermittently fed vertically. The power from the planted input case 26 via the planted output shaft 81 is transmitted to each planted transmission case 27, and rotationally drives the planted transmission case 27 and the planting claw 30 of each planted transmission case 27. When a fertilizer application device is provided, power is transmitted from the inter-stock shift case 75 to the fertilizer application device.

Inside the planted input case 26, a left-right long intermediate shaft 211 and a seedling table drive shaft 212 are arranged in parallel. The power transmitted to the planted input case 26 is transmitted to the lateral feeding mechanism 79 and the vertical seedling feeding mechanism 80 via the intermediate shaft 211 and the seedling table driving shaft 212. A plurality of lateral feed adjustment driven gears 214 are fixed to the seedling table drive shaft 212, while a lateral feed adjustment drive gear 213 corresponding to the lateral feed adjustment driven gear 214 is loosely fitted to the intermediate shaft 211. Only one of the plurality of lateral feed adjustment drive gears 213 is selectively driven from the intermediate shaft 211 by a slide key 215 that can be slid by a slide lever (not shown) provided in the planted input case 26. It is transmitted and rotates the seedling table drive shaft 212.

The horizontal feed adjusting gears 213 and 214 have different tooth ratios, and when the combination of the horizontal feed adjusting gears 213 and 214 is changed, the rotation ratio of the seedling table drive shaft 212 is changed. As a result, the lateral feed pitch of the seedling mount 29 changes, and the scraping amount of seedlings on the seedling mat changes. In the embodiment, there are four types of combinations of the lateral feed adjustment gears 213 and 214, and the number of lateral feeds is set to 18, 20, 26 or 30 times. Here, the number of lateral feeds means the number of times the two planting claws 30 for one row scrape the seedlings from the seedling mat while the seedling mounting table 29 is laterally fed to either the left or right moving end. There is. The combination of the lateral feed adjustment gears 213 and 214 corresponding to the lateral feed frequency of 30 is applied when using a seedling mat for high-density seedling raising.

Next, the hydraulic circuit structure of the rice transplanter 1 will be described with reference to FIG. 7. The hydraulic circuit 90 of the rice transplanter 1 includes a hydraulic pump 40a and a hydraulic motor 40b, which are components of the hydraulic continuously variable transmission 40, a charge pump 91, and a work pump 92. The hydraulic pump 40a, the charge pump 91, and the work pump 92 are driven by the power of the engine 5. The hydraulic pump 40a and the hydraulic motor 40b are connected to the respective suction side and discharge side via a closed loop oil passage 93. The charge pump 91 is connected to the closed loop oil passage 93. The swash plate angle of the hydraulic pump 40a is adjusted by driving the variable speed electric motor according to the depression amount of the traveling speed change pedal 12, and the hydraulic motor 40b is driven to rotate normally or reversely.

The work pump 91 is connected to a power steering unit 66 that assists the operation of the steering handle 14. The power steering unit 66 includes a steering hydraulic pressure switching valve 94 and a steering hydraulic motor 95. By operating the steering wheel 14, the steering hydraulic pressure switching valve 94 is switched to drive the steering hydraulic motor 95 to assist the operation of the steering wheel 14. As a result, the left and right front wheels 3 can be easily steered with a small operating force.

The power steering unit 66 is connected to the flow divider 96. The flow divider 96 branches into a first oil passage 97 and a second oil passage 98. The first oil passage 97 is connected to a lift switching valve 99 that supplies hydraulic oil to the lift cylinder 39. The elevating switching valve 99 is a 4-port 2-position mechanical switching type switchable to two positions, a supply position 99a for supplying hydraulic oil to the elevating cylinder 39 and a discharge position 99b for discharging hydraulic oil from the elevating cylinder 39. It is a valve. The raising/lowering switching valve 99 is switched by operating the work lever 16 to extend/contract the raising/lowering cylinder 39, whereby the seedling planting device 23 is raised/lowered via the raising/lowering link mechanism 22. The flow divider 96 and the lift switching valve 99 are housed in a valve unit 89 provided at the rear of the mission case 6.

An electromagnetic opening/closing valve 101 is provided in a cylinder oil passage 100 extending from the up/down switching valve 99 to the up/down cylinder 39. The electromagnetic opening/closing valve 101 is an electromagnetic control valve that can be switched between two positions, an open position 101a for supplying/discharging hydraulic oil to/from the lifting cylinder 39 and a closed position 101b for stopping supplying/discharging hydraulic oil to/from the lifting cylinder 39. is there. Therefore, when the electromagnetic solenoid 102 is excited to move the electromagnetic on-off valve 101 to the open position 101a, the elevating cylinder 39 can be expanded and contracted, and the seedling planting device 23 can be vertically moved. When the electromagnetic solenoid 102 is de-excited and the return spring 103 sets the electromagnetic on-off valve 101 to the closed position 101b, the elevating cylinder 39 is held incapable of expanding and contracting, and the seedling planting device 23 stops elevating at an arbitrary height position.

An accumulator 105 is connected between an electromagnetic on-off valve 101 and the lifting cylinder 39 in the cylinder oil passage 100 via an accumulator oil passage 104. When the working hydraulic pressure fluctuates rapidly in the lifting cylinder 39, the working hydraulic pressure fluctuation is absorbed by the accumulator 105, and the lifting cylinder 39 is smoothly expanded and contracted by the combination of the lifting switching valve 99 and the electromagnetic on-off valve 101, so that the seedlings are planted. The device 23 is moved up and down lightly.

The second oil passage 98 of the flow divider 96 is connected to the rolling control unit 106 that controls the laterally inclined posture of the seedling planting device 23. The rolling control unit 106 has a built-in electromagnetic control valve 107 that supplies hydraulic oil to the rolling cylinder 108. As a result of operating the rolling cylinder 108 provided integrally with the rolling control unit 106 by the switching operation of the electromagnetic control valve 107, the seedling planting device 23 is held in a horizontal posture. The hydraulic circuit 90 of the rice transplanter 1 also includes a relief valve, a flow rate adjusting valve, a check valve, an oil filter, and the like.

Next, the configuration of the seedling planting device 23 will be described with reference to FIGS. 8 to 11. The seedling planting device 23 includes a planting frame 111 that connects the front ends of four sets of eight-transplanting transmission cases 27. The planting frame 111 is extended in the left-right direction. The planted input case 26 is attached to the center of the planted frame 111. The planted input case 26 includes a horizontal feed shaft of a seedling table horizontal feeding mechanism 79 for laterally feeding the seedling mounting table 29 and a vertical direction of a seedling vertical feeding mechanism 80 for vertically feeding the seedling mounting table 29. The feed drive shaft 80a and the planted output shaft 81 of the seedling planting mechanism 28 are rotated.

A planting depth adjusting shaft 121 is rotatably supported below the front end of the planted transmission case 27. Brackets 113a and 113b arranged on the upper surfaces of the rear ends of the floats 32a and 32b are connected to the planting depth adjusting shaft 121 via planting depth adjusting links 114a and 114b. In addition, a proximal end portion of a planting depth adjusting member 122 that adjusts the reference planting depth is fixed to the planting depth adjusting shaft 121. The planting depth adjusting member 122 is rotated by the planting depth adjusting actuator mechanism 171 using the planting depth adjusting shaft 121 as a pivot to adjust the position. By adjusting the position of the planting depth adjusting member 122, the height position of the brackets 113a and 113b via the planting depth adjusting shaft 121 and the planting depth adjusting links 114a and 114b, and by extension, the floats 32a and 32b (objects to be adjusted). ) Is placed at the desired planting depth setting height. The sensing arm of the lift sensor mechanism 311 is attached to the front end of the center float 32a. The lift sensor mechanism 311 detects a change in the float inclination angle (planting depth). Above the center float 32a, the surface detection sensor mechanism 331 attached to the front surface of the planting frame 111 is arranged. The surface detection sensor mechanism 331 detects changes in the surface position of the field. At the front end of the side float 32b, a float accommodation mechanism 116 that restricts the vertical movement range of the front end of the side float 32b is attached.

Next, the rolling control device 109 will be described. As shown in FIG. 9, the lower end portion of the hitch bracket 38 is rotatably connected to a fulcrum member 141 fixedly provided substantially at the center of the planting frame 111 via a rolling fulcrum shaft 142. The hydraulic rolling cylinder 108 is attached to a mounting seat 143 provided on the upper end side of the hitch bracket 38. The tip of the piston rod 145 of the cylinder 108 is connected to a fixed bracket 147 attached to the rolling arm 146. The cylinder 108 is integrally provided with a rolling control unit 106 that reciprocally drives the double-acting cylinder 108. The rolling correction spring 149 is provided between the receiving plate 148 fixed to the upper surface of the mounting seat 143 and a pair of spring hooks provided on the upper rail frame 151 on the rear side of the seedling mounting table 29 with the center of the upper rail frame 151 interposed therebetween. Is stretched. When a pendulum type rolling sensor (not shown) detects the inclination of the seedling planting device 23, the piston rod 145 of the cylinder 108 is controlled to move back and forth to swing the seedling planting device 23 left and right around the rolling fulcrum shaft 142. The seedling planting device 23 is configured to be held horizontally.

Further, a seedling stand horizontal feed mechanism 79 and a seedling vertical feed mechanism 80 are connected to the planted input case 26. The feeder 79a of the seedling table lateral feed mechanism 79 is connected to the lower rear surface side of the seedling table 29, and laterally moves the seedling table 29 in the left-right width direction along the upper rail frame 151 and the lower rail frame 152. .. Therefore, the seedling mat on the seedling mounting table 29 is continuously fed back and forth in a lateral direction.
On the other hand, a pair of vertical feed drive cams 80b is fixed to the vertical feed drive shaft 80a of the seedling vertical feed mechanism 80. When the seedling mounting table 29 reaches the reciprocating end (returning point of reciprocating movement), each vertical feed drive cam 80b rotatably driven by the vertical feed drive shaft 80a comes into contact with the tip end of the driven cam 153 and the driven cam 153. Rotate. As a result, the endless belt-shaped seedling vertical feeding belt 155 is intermittently driven, and the seedling mat on the seedling mounting table 29 is intermittently vertically transported toward the seedling taking-out side (the inclined lower end side of the seedling mounting table 29).

The seedling vertical feed belt 155 includes a vertical feed drive roller attached to a laterally long vertical feed drive roller shaft 154 provided on the lower end side of the seedling placement table 29, and a horizontal left and right vertical orientation provided at a middle portion of the seedling placement table 29. It is wound around a vertical feed driven roller attached to the feed driven roller shaft 157. By placing two rectangular seedling mats in series on the seedling mat mounting surface of the seedling mounting table 29 and intermittently driving the vertical seedling feeding belt 155, the inclined lower end side of the seedling mat mounting surface of the seedling mounting table 29 (seedling The seedling mat is vertically fed toward the takeout side). The length of the seedling feeding surface of the seedling vertical feed belt 155 is longer than the length of one seedling mat. Further, the seedling interlocking cam 138 fixed to the seedling taking adjustment shaft 136 and the driven cam 153 attached to the vertical feed drive roller shaft 154 are connected through the interlocking wire 156 to cope with changes in the vertical seedling taking amount. Then, the vertical feed amount of seedlings is also changed, and the vertical feed amount of seedlings is appropriately adjusted according to the vertical feed amount of seedlings.

Further, as shown in FIG. 12, the seedling planting device 23 is provided with a seedling take-up adjusting tool 132 that moves the seedling take-out plate 131 at the lower end of the seedling placing table 29 up and down to adjust the vertical take-up amount. .. The seedling picking adjustment tool 132 is fixed to an upper part of a guide rod 134 which is vertically movably supported by a guide member 133 which is bolted to the planted transmission case 27. The base end of the seedling picking adjustment cam 135 is fixed to the seedling picking adjustment shaft 136 extending in the left-right direction. The tip of the seedling picking adjustment cam 135 is inserted into the seedling picking adjustment tool 132. Further, the base end portion of the seedling picking adjustment member 137 is fixed to the seedling picking adjustment shaft 136. The seedling picking adjustment actuator mechanism 181 adjusts the position of the seedling picking adjustment member 137 via the connecting member 139, so that the seedling picking plate 131 and the seedling picking adjustment tool 132 are set via the seedling picking adjustment shaft 136 and the seedling picking adjustment cam 135. Also, the guide rod 134 is moved up and down, and the seedling amount for one plant taken out by the planting claw 30 is adjusted. The seedling picking adjustment shaft 136 is rotatably supported by bearing plates fixed to the upper part of the planted transmission case 27.

Next, a detailed structure of the seedling planting mechanism 28 and its periphery will be described with reference to FIGS. 13 to 18. Behind the planting input case 26, a seedling take-out plate 131 having a seedling take-out port 220 is arranged so as to extend in a substantially horizontal direction. A lower rail frame 152 that extends in a substantially horizontal direction is fixed to the lower part of the back surface of the seedling stand 29. The lower slide shoe 223 provided on the seedling take-out plate 131 is slidably fitted into the lower rail frame 152 from below.

At each seedling take-out port 220 of the seedling take-out plate 131, a take-out port cover 226 that surrounds the inner peripheral edge of the seedling take-out port 220 and a planting claw holding guide 227 that holds the longitudinal middle part of the planting claw 30 from both left and right sides. And a planting claw tip guide 228 facing the tip side of the planting claw 30 is detachably attached. In this case, the bolt mounting holes 241 provided at two locations in the seedling take-out plate 131 in the vicinity of the respective seedling taking-out ports 220, the attaching holes 242 on the upper end side of the planting claw tip guide 228, and the attaching holes of the taking-out port cover 226. 243 and the mounting hole 244 on the upper end side of the planting claw pinching guide 227 are tightened together by bolts 229 in a state where they are sequentially overlapped. The presence of the outlet cover 226 contributes to improving the strength of each seedling outlet 220 in the seedling take-out plate 131 and stabilizing the scraping amount of the seedling mat on the seedling mat by the planting claw 30. The upper end side of the planting claw tip guide 228 and the planting claw pinching guide 227 also contributes to the improvement of the strength of each seedling take-out port 220 by the joint fastening structure.

In the embodiment, two types of combinations of the outlet cover 226, the planting claw holding guide 227 and the planting claw tip guide 228 are prepared as the outlet unit 230. One is for high density seedling mats and the other is for standard type seedling mats. The take-out unit 230 is replaced depending on which type of seedling mat is used. In the outlet cover 226, the groove width dimension ΔW of the opening groove 231 through which the planting claw 30 passes is made wide and narrow between high density seedling raising and standard type seedling raising. As shown in FIG. 18, the groove width dimension ΔWa (see (A)) of the take-out port cover 226a for high-density seedling is calculated from the groove width dimension ΔWb (see (B)) of the take-out port cover 226b for standard type nursery. Is also narrow.

In this embodiment, the attachment holes 244 of the planting claw sandwiching guide 227 are formed laterally long, and the mounting position of the planting claw sandwiching guide 227 on the seedling extracting plate 131 is set to the seedling extracting port 220 of the extracting plate 131. The holes 241 for mounting bolts are adjustable in the width direction of the opening groove 231. As a result, the planting claw holding guide 227 having the same shape can be adapted to both the groove width dimension ΔWa of the take-out port cover 226a for high-density seedling raising and the groove width dimension ΔWb of the take-out port cover 226b for standard type seedling raising. Therefore, the planting claw holding guide 227 can be shared by the take-out unit 230 for the seedling mat for high-density seedling and the take-out unit 230 for the seedling mat for standard type seedling, and the design cost of the planting claw holding guide 227 can be reduced. Manufacturing cost can be reduced.

As shown in FIG. 13 and FIG. 19, planting claws 30 and U-shaped push-out pieces 234 for pushing out the seedlings sandwiched by the planting claws 30 are provided on both longitudinal ends of each rotary case 31 in the seedling planting mechanism 28. , And a push rod 235 for sliding the extruded piece 234 along the planting claw 30. The planting claws 30 are detachably attached to the claw cases 236 located at both longitudinal ends of the rotary case 31 with the slicing bolts 237 and the nuts 238. The pushing piece 234 is fixed to the tip of the push rod 235.

As shown in FIG. 20, in the embodiment, two types of combinations of the planting claw 30, the pushing piece 234 and the push rod 235 are prepared as the planting claw unit. One is for high density seedling mats and the other is for standard type seedling mats. The tip side of the planting claw 30a for high-density seedling raising is made narrower than the base side.

On the other hand, the outside of the bifurcated upper end portion of the extruded piece 234a for high-density seedling is formed into a chamfered shape with its corner cut off so as to incline obliquely downward from the inside to the outside. Then, the bifurcated upper end side of the extruded piece 234a is slidably brought close to the back surface of the narrow tip end side of the planting claw 30a for high-density seedling raising. In this way, if the tip end side of the planting claw 30a and the bifurcated upper end side of the extruded piece 234a are configured to be narrow, it is possible to easily scrape one seedling from the seedling mat for high-density seedling raising. However, it is possible to prevent the scraped seedlings from clogging the U-shaped extrusion piece 234a. On the other hand, the standard type seedling extruding piece 234b is formed with a substantially uniform thickness. Then, the bifurcated upper end side of the extruded piece 234b is slidably brought close to the back surface of the tip side of the standard-type seedling-growing claw 30b.

Next, the shape of the planting nail will be described with reference to FIGS. 21 to 23. The planting claw 30a for high-density seedling raising and the planting claw 30b for standard-type seedling raising are a pair of protrusions in the same direction on both sides along the longitudinal direction of the attachment surface portion 301a or 301b and the attachment surface portion 301a or 301b. The rib portions 302a, 302a or 302b, 302b are provided and are formed in a C shape in a sectional view. The planting claws 30a and 30b are formed by pressing a plate-shaped metal member, and the attachment surface portions 301a and 301b and the rib portions 302a and 302b have substantially the same thickness. The length LA of the planting claw 30a and the length LB of the planting claw 30b are the same.

The planting claws 30a, 30b are provided with a pair of claws 305a, 305a or 305b, 305b formed by branching a tip portion (one end side) 303a or 303b from a branch portion 304a or 304b in a bifurcated manner. The length LAc of the claw portion 305a and the length LBc of the claw portion 305b are the same. As described above, the planting claw width WA of the tip part 303a of the planting claw 30a is smaller than the planting claw width WB of the tip part 303b of the planting claw 30b. The claw groove width WAs of the claw groove 309a of the planting claw 30a and the claw groove width WBs of the claw groove 309b of the planting claw 30b are the same. The claw width WAc of the claw portion 305a is smaller than the claw width WBc of the claw portion 305b.

As shown in FIG. 23, the closed ends (ends on the side of the nail roots 361a and 361b) 310a and 310b of the inter-claw grooves 309a and 309b are formed in a pointed shape rather than a semicircular shape in plan view. In this embodiment, the closed end portions 310a and 310b of the inter-claw grooves 309a and 309b are formed in a substantially V shape in a plan view. In addition, the inner claw periphery 362a, 362b of the claw base portions 361a, 361b of the claw portions 305a, 305b has a virtual half whose diameter is between claw groove widths WAs, WBs and whose arc center is located at the top of the closed ends 310a, 310b. It is located on the tip side of the claws 305a and 305b with respect to the circle 363. That is, the claw inner peripheral portions 362a and 362b are formed more gently than the virtual semicircle 363. Further, the inner claw edge portions 362a, 362b are inclined from the positions closer to the tip ends of the claw portions 305a, 305b than the virtual semicircle 363 to the center line side of the inter-claw grooves 309a, 309b. With this shape, the width of the claw root portions 311a and 311b of the claw portions 305a and 305b in the bifurcated branch portions 304a and 304b is formed to be thick in a plan view, and the strength of the claw root portions 311a and 311b is improved. As a result, in the planting claws 30a and 30b, irreversible deformation of the claw root portions 311a and 311b at the time of scraping seedlings can be prevented, and the distance between the claw portions 305a, 305a or 305b, 305b on the tip side can be deformed. Can be prevented and proper scraping of seedlings can be realized. Such shapes of the inter-nail groove 309a and the nail root portion 361a are particularly effective for the high density seedling planting nail 30a having a small nail width WAc of the nail portion 305a.

The rib portions 302a and 302b are formed on both sides of the attachment surface portions 301a and 301b in the longitudinal direction from the tip portions 303a and 303b to the base end portions (the other end side) 306a and 306b. The rib portions 302a and 302b are provided so that the rib height increases from the tips of the claw portions 305a and 305b toward the branch portions 304a and 304b, and the rib portions 302a and 302b are located closer to the base end portions 306a and 306b than the branch portions 304a and 304b. The rib height is highest. Further, the rib portions 302a and 302b are provided so that the rib height becomes lower from the highest rib height toward the base end portions 306a and 306b to approximately the center position in the longitudinal direction of the attachment surface portions 301a and 301b. It is provided at a uniform height from the central position toward the base end portions 306a and 306b. The rib portions 302a and 302b have substantially the same side view shape (see FIG. 21B and FIG. 22B).

The base end widths WAr, WBr at the base end parts 306a, 306b of the planting claws 30a, 30b are the same. In the base end portions 306a, 306b, two attachment holes 307a, 307a or 307b, 307b arranged in the longitudinal direction are formed in the attachment surface portions 301a, 301b. The planting claws 30 a and 30 b are detachably attached to the claw case 236 with nuts 238 by inserting the mounting holes 307 a and 307 a or 307 b and 307 b into the slicing bolts 237 and 237 attached to the claw case 236 ( See FIG. 19).

In the claw portions 305a and 305b, chamfered inclined surface portions 308a and 308b are formed inside the tip portions of the rib portions 302a and 302b. As a result, the tips of the ribs 302a, 302b in the claws 305a, 305b are formed to be thin and have a substantially pointed shape, and the ease with which the claws 305a, 305b enter the seedling mat and the cutting performance are improved. ..

Here, the inclined surface portion 308b of the planting claw 30b is provided on the tip side of the branch portion 304b, whereas the inclined surface portion 308a of the planting claw 30a extends to the base end portion 306a side of the branch portion 304a. Is provided. This further improves the ease with which the claw portion 305a of the planting claw 30a enters the seedling mat and the cutting performance. Further, since the inclined surface portion 308a of the rib portion 302a is extended to the base end portion 306a side from the branch portion 304a, the thickness of the tip portion of the rib portion 302a is thin near the branch portion 304a. As described above, in the planting claw 30a, the closed end portion 310a of the inter-claw groove 309 is formed in a pointed shape rather than a semicircular shape in a plan view, and the width of the claw base portion 311a of the claw portion 305a is formed to be thick in a plan view. As a result, the strength of the branched portion 304a is improved. Therefore, even if the tip portion of the rib portion 302a is thin near the branch portion 304a, the physical strength of the branch portion 304a does not irreversibly deform when the claw portion 305a enters the seedling mat. can get. In the planting claw 30b, the inclined surface portion 308b may be provided so as to extend to the base end portion 306a side with respect to the branch portion 304b.

In the above-described embodiment, the plate-shaped planting claws 30a and 30b in which the plate-shaped metal material is bent are detachably attached to the rice transplanter 1, but the planting claws attached to the rice planter 1 are Alternatively, a planting nail (also referred to as a nail) having a pair of needle-shaped nail portions may be used. In such a planting claw, it is preferable that the closed ends of the claw grooves of the pair of needle-shaped claws are formed in a pointed shape rather than a semicircular shape in plan view. Thereby, similarly to the planting claws 30a and 30b of the above-described embodiment, both claw root portions of the pair of needle claw portions are thickened in the width direction in a plan view to increase the strength of the claw root portions of the needle claw portions. Can be improved. As a result, it is possible to prevent irreversible deformation of the claw base portion of the needle-shaped claw portion, prevent deformation of the tip side of the needle-shaped claw portion, and realize appropriate scraping of seedlings.

As described above, the planting claws 30a and 30b for the rice transplanter 1 are for scraping one seedling from the seedling mat placed on the seedling placing table 29 as described in the above embodiment. , Has a pair of claw portions 305a, 305a or 305b, 305b formed by branching the tip portion (one end side) 303a or 303b in a bifurcated manner, and an inter-claw groove between the pair of claw portions 305a, 305a or 305b, 305b. 309a or 309b has a closed end portion (end portion on the nail root 361a, 361b side) 310a or 310b formed in a pointed shape rather than a semicircular shape in plan view. As a result, both the claw root portions 361a, 361a or 361b, 361b of the pair of claw portions 305a, 305a or 305b, 305b are thickened in the width direction in plan view, and the claw root portions 361a, 361b of the claw portions 305a, 305b are Strength can be improved. Thereby, it is possible to prevent irreversible deformation of the claw root portions 361a, 361b of the claw portions 305a, 305b, prevent deformation of the tip side spacing of the claw portions 305a, 305b, and appropriately scrape the seedlings. realizable.

Further, in the planting claw 30a for the rice transplanter 1, since the tip portion 303a (one end side) is configured to be narrower than the base end portion (the other end side) 306a of the planting claw 30a, While being able to reduce the scraping area of the seedlings for one strain, it is possible to improve the strength of the nail root portion 361a of the nail portion 305a and prevent irreversible deformation of the nail root portion 361a of the nail portion 305a. It is possible to prevent the distance on the tip side of the claw portion 305a from being deformed, and it is possible to realize appropriate scraping of seedlings from the seedling mat for high-density seedling raising.

Further, the rice transplanter 1 includes a seedling planting device 23 that scrapes off the seedlings from the seedling mat placed on the seedling placing table 29 with the planting nails 30 and plantes them in the field, and the planting nails 30a or 30a are used as the planting nails 30. Since 30b is provided, the reliability of the planting claw 30 can be improved, and the suspension of the seedling planting work due to the deformation of the planting claw 30 can be suppressed to perform a smooth seedling planting work.

Next, with reference to FIGS. 24 and 25, a gap between the planting claw 30 and the outlet cover 226 when the planting claw 30 passes through the opening groove 231 of the outlet cover 220 will be described. In this embodiment, the gap between the high density seedling raising nail 30a and the take-out port cover 226a is made wider than the gap between the standard type seedling raising nail 30b and the take-out port cover 226b. Here, the width of the planting claw at the tip of the planting claw 30a for relatively high-density seedling raising that is relatively narrow is WA, and the opening groove width of the outlet cover 226a is ΔWa. The total value of the left and right gaps between the planting claw 30a and the opening groove 231 of the outlet cover 226a when the planting claw 30a passes through the opening groove 231 is defined as a gap ΔWa-WA. Further, the width of the planting claw at the tip of the planting claw 30b for standard seedling raising, which is relatively wide, is WB, and the opening groove width of the outlet cover 226b is ΔWb. The total value of the left and right gaps between the planting claw 30b and the opening groove 231 when the planting claw 30b passes through the opening groove 231 of the outlet cover 226b is defined as a gap ΔWb-WB. The planted claw width WA is narrower than the planted claw width WB. The opening groove width ΔWa is narrower than the opening groove width ΔWb. In addition, in this embodiment, the opening groove width ΔWa of the high density seedling raising outlet cover 226a is wider than the planting claw width WB of the standard type planting claw 30b.

The gap ΔWa-WA between the set of the planting claw 30a and the seedling intake cover 226a is larger than the product of the gap ΔWb-WB between the set of the planting claw 30b and the seedling port cover 226b and the reduction ratio WA/WB. Has been done. That is, rather than setting the opening groove width ΔWa for high-density seedling raising by reducing the opening groove width ΔWb with the reduction ratio WA/WB of the planting nail width WA to the standard type seedling nail width WB, the opening is not set. The groove width ΔWa is made larger than the value of the product of the opening groove width ΔWb and the reduction ratio WA/WB. In other words, the ratio ΔWa/WA between the planting claw width WA and the opening groove width ΔWa is set to be larger than the ratio ΔWb/WB between the planting claw width WB and the opening groove width ΔWb. Thereby, with respect to the planting claw width WA of the planting claw 30a for high density seedling and the opening groove width ΔWa of the outlet cover 226a, the planting claw width WB and the opening groove width ΔWb for standard type seedling raising are reduced at the same reduction ratio. The gap ΔWa-WA between the planting claw 30a and the opening groove 231 of the seedling intake cover 226a can be increased as compared with the case of simply reducing the size. Then, it is possible to prevent the seedlings from being clogged in the gap and appropriately scrape one seedling of the seedling from the seedling mat for high-density seedling raising.

Further, in the embodiment, the gap ΔWa-WA between the planting nail 30a for high-density seedling raising and the seedling intake cover 226a is smaller than the gap ΔWb-WB between the planting nail 30b for standard type seedling raising and the seedling inlet cover 226b. Be made bigger. As a result, it is possible to more reliably prevent the seedlings from clogging the gap between the planting claw 30a and the opening groove 231 of the seedling intake cover 226a, and more appropriately scrape one seedling from the seedling mat for high-density seedling raising. be able to.

Even if the gap ΔWa-WA is the same as the gap ΔWb-WB, seedlings are prevented from being clogged in the gap between the planting claw 30a and the opening groove 231 of the seedling intake cover 226a, and the seedling mat for high-density seedling raising is provided. It is possible to appropriately scrape one seedling of the above. Even if the gap ΔWa-WA is smaller than the gap ΔWb-WB, if the gap ΔWb-WB is larger than the product of the reduction ratio WA/WB, the same action and effect as those of the above-described embodiment can be obtained.

Further, in the embodiment, the opening groove width ΔWa of the seedling intake cover 226a for high-density seedling raising is made wider than the planting claw width WB of the standard-type seedling raising nail 30b. Even if the seedling planting mechanism 28 is driven with the seedling outlet cover 226a attached to the seedling outlet 220 of the seedling pickup plate 131 and the planting claw 30b attached to the nail case 236, the outlet cover may be driven. 226a and the planting claw 30b do not contact. As described above, even when the worker mounts the take-out port cover 226a for high-density seedling raising and the planting claw 30b for standard type nursery on the rice transplanter 1, the contact between the take-out port cover 226a and the planting claw 30b is performed. It is possible to prevent damage to the drive mechanism inside the nail case 236 and the seedling planting mechanism 28.

As described above, as described in the above embodiment, the rice transplanter 1 scrapes off the seedlings from the seedling mat placed on the seedling placing table 29 with the planting claws 30 detachably attached to the nail case 236 and plantes them in the field. The seedling planting device 23 is provided, and the seedling takeoff port 226 having the opening groove 231 through which the planting claw 30 passes is detachably attached to the seedling takeoff port 220 of the seedling takeout plate 131 arranged below the seedling placing table 29, The set of the planting claw 30 and the take-out port cover 226 is a set of the planting claw 30a having the planting claw width WA and the set of the take-out port cover 226a having the opening groove width ΔWa, or a planting claw width wider than the planting claw width WA. It can be replaced with a set of a planting claw 30b having WB and an outlet cover 226b having an opening groove width ΔWb wider than the opening groove width ΔWa, and a gap ΔWa− which is a difference between the planting claw width WA and the opening groove width ΔWa. Since WA is set to be larger than the product value of the clearance ΔWb−WB, which is the difference between the planting claw width WB and the opening groove width ΔWb, and the reduction ratio WA/WB, the wide planting claws 30b and The planting claw width WB and the opening groove width ΔWb of the set of the outlet cover 226b are reduced at the same reduction ratio to narrow the planting claw 30a and the planting claw width WA and the opening groove width ΔWa of the set of the outlet cover 226a. Compared with the case of setting, the gap ΔWa-WA between the planting claw 30a and the opening groove 231 of the outlet cover 226a can be widened, and the seedling can be prevented from being clogged in the gap. If a narrow set of the planting claw 30a and the take-out port cover 226a is used, the planting claw 30a can reduce the area for scraping off the seedling mat, but at the same time, one seedling can be properly collected from the seedling mat. Can be scraped.

Further, in the rice transplanter 1, the gap ΔWa-WA is made larger than the gap ΔWb-WB, so that when using the narrow set of the planting claw 30a and the outlet cover 226a, the planting claw 30a and the outlet cover 226a are used. It is possible to more reliably prevent the seedlings from being clogged in the gap of the opening groove 231 of 1., and more appropriately scrape one seedling from the seedling mat while reducing the area where the planting claw 30a scrapes the seedling mat. You can

The present invention is not limited to the above-described embodiment, but can be embodied in various aspects. The configuration of each unit is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 Rice transplanter 29 Seedling mount 30,30a, 30b Claw 23 with planting Seedling device 131 Seedling take-out plate 220 Seedling take-out port 226, 226a, 226b Take-out port cover 231 Open groove 236 Claw case

Claims (2)

In a rice transplanter equipped with a seedling planting device that scrapes seedlings from a seedling mat placed on a seedling mounting table with a planting nail detachably attached to a nail case and planted in a field,
The seedling take-out port of the seedling take-out plate arranged below the seedling placing table is detachably attached with an take-out port cover having an opening groove through which the planting claw passes,
A set of the planting claw and the take-out port cover is a set of the planting claw having a planting claw width WA and a take-out port cover having an opening groove width ΔWa, or a planting claw width WB wider than the planting claw width WA. And a take-out pawl having an opening groove width ΔWb wider than the opening groove width ΔWa.
The gap ΔWa-WA, which is the difference between the planting claw width WA and the opening groove width ΔWa, is larger or the same size as the gap ΔWb-WB, which is the difference between the planting claw width WB and the opening groove width ΔWb. Has been
Rice transplanter. The gap ΔWa-WA is made larger than the value of the product of the gap ΔWb-WB and the reduction ratio WA/WB .
The rice transplanter according to claim 1.

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