WO2018074182A1 - Rice transplanter - Google Patents

Abstract

This rice transplanter 1 is equipped with a seedling planting device 23 for scraping off seedlings from a seedling mat placed on a seedling platform 29 with a planting claw 30 detachably attached to a claw case 236 and planting the seedlings in cultivated land. An extraction port cover 226 having an opening groove 231 through which the planting claw 30 passes is detachably attached to a seedling extraction port 220 of a seedling extraction plate 131 positioned beneath the seedling platform 29, and a set comprising the planting claw 30 and the extraction port cover 226 can be substituted with a set comprising a planting claw 30a having a planting claw width WA and an extraction port cover 226a having an opening groove width ΔWa, or a set comprising a planting claw 30b having a planting claw width WB wider than the planting claw width WA, and an extraction port cover 226b having an opening groove width ΔWb wider than the opening groove width ΔWa, and the gap ΔWa-WA which is the difference between the planting claw width WA and the opening groove width ΔWa is greater than the product of the reduction ratio WA/WB and the gap ΔWb-WB which is the difference between the planting claw width WB and the opening groove width ΔWb.

Description

Rice transplanter

The present invention relates to a rice transplanter equipped with a seedling planting device for scraping seedlings from a seedling mat placed on a seedling stand with planting claws and planting them in a field.

Conventionally, in a rice transplanter used for seedling planting work in a farm field, a seedling planting device having a transplanting mechanism with a seedling stage and a planting claw is attached to the rear part of the traveling machine body. As a transplanting mechanism of a seedling planting apparatus, a type having two planting claws in one rotary case is common. In this case, when the rotary case rotates once, the two planting claws each rotate once in the opposite direction with respect to the rotary case. That is, each planting claw is structured to rotate while revolving around the rotational axis of the rotary case.

In the seedling planting operation, by intermittently laterally feeding the seedling platform on which the seedling mat is placed at predetermined intervals, the planting claw directed toward the seedling platform is rotated while revolving around the axis of the rotary case, The planting claws are reciprocated between the seedling stage and the field scene, and the seedlings are scraped one by one from the seedling mat and planted in the field.

The seedling mat used in the seedling planting operation by the rice transplanter has seed pods on the floor soil spread in a rectangular seedling box with an inner diameter of about 580 mm (length) x about 280 mm (width) x about 30 mm (height). It is seeded, germinated in a state of covering with soil, raised and matted into a mat shape. As seedling mat types, in addition to a standard seedling seedling mat in which about 100 to 130 g of seed pods are sown in one seedling box, for example, a seedling sowing amount in one seedling box is about 200 to 300 g. A seedling mat for high density seedling raising is known (for example, see Patent Document 1).

The seedling mats for high-density seedlings are densely grown compared to the standard seedling seedling mats. When using a high-density seedling mat, the area where the planting claw scrapes off the seedling mat compared to when using a standard seedling seedling mat so that the number of seedlings per plant that the planting nail scrapes from the seedling mat is appropriate. Is reduced. Thereby, the number of seedling mats required for the rice planting work per unit area can be reduced, and the economic efficiency is improved.

Japanese Patent Laying-Open No. 2015-043731

When using a high-density seedling mat, a narrower high-density seedling planting nail is used than the standard seedling seedling so that the area where the planting nail scrapes the seedling mat is smaller . In addition, the outlet cover having an opening groove through which the planting claw passes at the seedling outlet of the seedling extraction plate arranged below the seedling stand is also relatively narrow in accordance with the planting claws for high-density seedling raising. An outlet cover for high-density seedlings having an open groove is used. Here, regarding the planting claw width of the planting claws for high-density seedling raising and the opening groove width of the outlet cover, if the planting claw width and opening groove width for the standard type seedling are simply reduced at the same ratio, There was a problem that proper seedling could not be scraped off, such as the seedling clogged between the claw and the opening groove.

The present invention has been made in view of the above-described present situation, and a technical problem is to appropriately set 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 for scraping seedlings from a seedling mat placed on a seedling stand with planting claws detachably attached to a nail case and planting them on a field. A take-out cover having an opening groove through which the planting claw passes is detachably attached to a seedling take-out port of a seedling take-out plate disposed below the seedling mount, and the set of the planting claw and the take-out 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 covers 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 equal to the planting claw width WB and the planting claw width WB. The value of the product of the gap ΔWb−WB, which is the difference in the opening groove width ΔWb, and the reduction ratio WA / WB But also it is larger.

In the rice transplanter of the present invention, the gap ΔWa-WA may be made 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.

The rice transplanter of the present invention is a rice transplanter equipped with a seedling planting device for scraping off seedlings from a seedling mat placed on a seedling mounting table with planting claws detachably attached to a nail case, An outlet cover having an opening groove through which the planting claw passes is detachably attached to a seedling outlet of a seedling extraction plate arranged below the seedling mount, and a set of the planting claw and the outlet cover is attached. From 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 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 equal to the planting claw width WB and the opening. More than the product of the gap ΔWb−WB, which is the difference in the groove width ΔWb, and the reduction ratio WA / WB Since the nail width WB and the opening groove width ΔWb of the wide claw and cover set are reduced at the same reduction ratio, the nail width WA and the opening groove of the narrow claw and cover set are reduced. Compared with the case where the width ΔWa is set, the gap ΔWa-WA between the planting claw and the opening groove can be widened, and the seedling can be prevented from clogging the gap. And if a narrow nail | claw and cover group are used, the seedling for 1 strain | stump | stock can be scraped off appropriately from a seedling mat, although it is the structure which can reduce the area which a planting nail scrapes off a seedling mat.

In the rice transplanter according to the present invention, if the gap ΔWa-WA is made larger than the gap ΔWb-WB, seedlings are formed in the gap between the planting claw and the opening groove when a narrow claw and cover assembly are used. Clogging can be prevented more reliably, and the seedling for one strain can be scraped off from the seedling mat more appropriately while reducing the area where the planting claws scrape off the seedling mat.

It is a left view of the riding type rice transplanter in the embodiment. It is a top view of a riding type rice transplanter. It is a left view which shows the positional relationship of an engine, a transmission case, and a rear axle case. It is a top view which shows the positional relationship of an engine, a transmission case, and a rear axle case. It is a top view of the driving operation part which abbreviate | omitted the steering handle. It is a drive system figure of a riding type rice transplanter. It is a hydraulic circuit diagram of a riding type rice transplanter. It is a left view of a seedling planting apparatus. It is a front view of a seedling planting apparatus. It is a top view of a seedling planting apparatus. It is a top view for demonstrating the planting depth adjustment axis | shaft and the seedling collection adjustment axis periphery. It is left side sectional drawing for demonstrating seedling vertical harvest amount adjustment. It is a top view around a seedling taking exit. It is a top view of a transplant mechanism. It is a left view of a transplant mechanism. It is a rear view which shows a planting claw guide structure. It is a separation perspective view of a planting claw guide structure. It is a figure which shows an outlet cover and a planting nail | claw guide, Comprising: (A) shows the outlet cover for high-density seedlings, (B) shows the outlet cover for standard type seedlings. It is an isolation | separation perspective view which shows the attachment / detachment structure of a planting nail | claw and an extrusion piece. It is a front view of a planting nail | claw, an extrusion piece, and a push rod, It is a top view and a left view, Comprising: (A) shows the object for high-density seedling raising, (B) shows the object for standard seedling raising. It is a figure which shows the planting nail | claw for high-density seedling raising, Comprising: It is (A) top view, (B) Left side sectional drawing, (C) Front view, (D) Bottom view. It is a figure which shows the planting nail | claw for standard type seedling raising, Comprising: It is (A) top view, (B) Left side sectional drawing, (C) Front view, (D) Bottom view. It is a top view which expands and shows the nail | claw root part of a nail | claw part of a planting nail | claw, Comprising: (A) shows the object for high-density seedling raising, (B) shows the object for standard type seedling raising. It is a top view which shows the take-out cover for high density seedling raising, and a planting nail | claw periphery. It is a top view which shows the take-out cover for standard type seedling raising, and a planting nail periphery.

Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings in a case where the invention is 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, the outline of the rice transplanter 1 will be described with reference to FIGS. The rice transplanter 1 according to 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 portion of the traveling machine body 2. Power from the engine 5 is transmitted to the rear transmission case 6 to drive the front wheels 3 and the rear wheels 4 so that the traveling machine body 2 travels forward and backward. A front axle case 7 projects from the left and right sides of the transmission case 6, and the front wheels 3 are attached to a front axle 36 extending from the front axle case 7 to the left and right so as to be steerable. A cylindrical frame 8 protrudes behind the transmission case 6, a rear axle case 9 is fixed to the rear end side of the cylindrical frame 8, and the rear wheel 4 is attached to a rear axle 37 that extends outward from the rear axle case 9 to the left and right. ing.

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

In addition, a steering handle 14, a traveling main transmission lever 15, and a working lever 16 as a lifting operation tool are provided in the driving operation unit 13 on the rear upper surface side of the front bonnet 11 (see FIG. 5). A steering seat 18 is disposed via a seat frame 17 behind the front bonnet 11 on the upper surface of the work step 10. Note that left and right spare seedling platforms 24 are provided on the left and right sides of the front bonnet 11 with the operation step 10 interposed therebetween.

A link frame 19 is erected at the rear end of the traveling machine body 2. An eight-row seedling planting device 23 is connected to the link frame 19 via an elevating link mechanism 22 including a lower link 20 and a top link 21 so as to be elevable. 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 a hitch bracket 38 to the rear side of the lifting link mechanism 22, the seedling planting device 23 is disposed behind the traveling machine body 2 so as to be movable up and down. A cylinder base end side of a hydraulic lift cylinder 39 (lift control mechanism) is supported on the rear upper surface of the cylindrical frame 8 so as to be rotatable up and down. The rod tip side of the lifting cylinder 39 is connected to the lower link 20. As a result of vertically moving the lifting link mechanism 22 by the expansion and contraction of the lifting cylinder 39, the seedling planting device 23 moves up and down. Note that the seedling planting device 23 is configured to be rotatable about the rolling fulcrum axis so as to be able to change the inclined posture in the left-right direction.

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 device 23 and move the seedling planting in the field while moving in the field by the driving operation. Perform work (rice planting work). During the seedling planting operation, the operator replenishes the seedling planting device 23 with a seedling mat on the preliminary seedling mounting table 24 as needed.

As shown in FIGS. 1 and 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 an 8-strip 4 connected to the planting input case 26. A set (one set of two) of planting transmission cases 27, a seedling planting mechanism 28 provided on the rear end side of each planting transmission case 27, a seedling mounting base 29 for eight-row planting, and each planting And a float 32 for surface flattening disposed 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 strip. Two planting transmission cases 27 are arranged in the planting transmission case 27. By one rotation of the output shaft of the planting transmission case 27, the two planting claws 30 cut out and seize one seedling each and plant it on the field leveled by the float 32. On the front side of the seedling planting device 23, a leveling rotor 85 for leveling (leveling) the farm scene is provided so as to be movable up and down. As shown in FIG. 20, the seedling planting device 23 is provided with a box application agent spreader (medicine spreader) 400 that spreads the box application agent on the seedling mat placed on the seedling mount 29.

Although details will be described later, the power from the engine 5 via the transmission 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 transmission case 6 toward the seedling planting device 23 is once transmitted to the inter-plant transmission case 75 provided on the upper right side of the rear axle case 9, and is transmitted from the inter-plant transmission case 75 to the planting input case 26. The The seedling planting mechanism 28 and the seedling mount 29 are driven by the transmitted power. The inter-strain shifting case 75 includes an inter-strain shifting mechanism 76 that switches between planted seedlings to, for example, sparse planting, standard planting, or dense planting, and a planting clutch 77 that interrupts power transmission to the planting planting device 23. (See FIG. 6).

In addition, a line marker 33 is provided on the left and right outer sides of the seedling planting device 23. The line marker 33 includes a marker ring body 34 for muscle pulling, and a marker arm 35 that rotatably supports the marker ring body 34. The base end side of each marker arm 35 is pivotally supported on the left and right outer sides 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 operation lever 16 in the driving operation unit 13 and the work posture formed by landing on the surface as a reference trajectory in the next process, and the marker ring body 34 is lifted away from the surface. The non-working posture is configured to be rotatable.

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 a laterally long intermediate connection frame 53. The front ends of the pair of left and right front frames 51 are fixed to the front frame 54 by welding. The rear end sides of the 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 connection frame 53 are configured in a square frame shape in plan view. Similarly, the intermediate connection frame 53, the left and right rear frames 52, and the rear frame 55 are also configured in a square frame shape in plan view.

As shown in FIG. 4, the front portions 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 shape bent into a U shape so as to be positioned lower than the left and right front frames 51. The left and right end portions of each base frame 56 are fixed to the corresponding front frame 51 by welding. The engine 5 is mounted on and supported by the front and rear base frames 56 via a substantially flat engine stand 57 and a plurality of vibration isolating rubbers (not shown). The rear base frame 56 is connected to the front portion of the transmission case 6 via the 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 a front axle case 7 protruding from the left and right sides of the mission case 6. The left and right ends of a U-shaped frame 61 extending rearward and obliquely downward in a side view are welded and fixed to the center side of the intermediate connection frame 53. The middle part of the U-shaped frame 61 is connected to the middle part of the cylindrical frame 8 that connects the transmission case 6 and the rear axle case 9 (see FIGS. 3 and 4). The upper ends of the two left and right vertical frames 62 are welded and fixed to the middle portion of the rear frame 55. An intermediate portion of a laterally long rear axle support frame 63 is fixed by welding to the lower ends of the left and right vertical frames 62. The left and right ends of the rear axle support frame 63 are connected to the rear axle case 9. A muffler 65 for reducing the exhaust noise of the engine 5 is disposed below the step support base 64 projecting 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 disposed behind the engine 5. Although details are omitted, a handle shaft is rotatably disposed inside a handle post erected on the upper surface of the power steering unit 66. A steering handle 14 is fixed to the upper end side of the handle shaft. On the lower surface side of the power steering unit 66, a steering output shaft (not shown) protrudes downward. A steering rod 68 (see FIG. 4) for steering the left and right front wheels 3 is connected to the steering output shaft.

The engine 5 of the embodiment is disposed on an intermediate portion of the front and rear base frames 56 with the output shaft 70 (crank shaft) directed in the left-right direction. The left and right widths of the engine 5 and the engine stand 57 are smaller than the inner dimensions between the left and right front frames 51, and the lower side of the engine 5 and the engine stand 57 are disposed on the middle part 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 in a position overlapping the left and right front frames 51 in a side view. An exhaust pipe 69 communicating with the exhaust system of the engine 5 is disposed on one of the left and right side surfaces (left side surface in the embodiment) of the engine 5. The proximal end side of the exhaust pipe 69 is connected to each cylinder of the engine 5, and the distal 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 the left and right sides (in the embodiment, on the left side) sandwiching the steering handle 14. Along the guide groove 83 formed in the driving operation unit 13. The traveling mode of the rice transplanter 1 is switched to forward, neutral, reverse, seedling and movement modes by operating the traveling main speed change lever 15. The work lever 16 holds the steering handle 14 between them. It is located on the other side of the right and left sides (right side in the embodiment) The work lever 16 is operated in a plurality of operations such as raising / lowering the seedling planting device 23, switching operation of the planting clutch 77, and selecting operation of the left / right line marker 33. Is configured to be operable in the cross direction.

In this case, when the operation lever 16 is tilted forward once, the seedling planting device 23 is lowered, and when it is tilted forward once again, the planting clutch 77 is engaged and activated (becomes a power connection state). Conversely, when the operation lever 16 is tilted once backward, the planting clutch 77 is turned off (becomes in a power cut-off state), and when it is tilted again once, the seedling planting device 23 is raised. When stopping the raising / lowering operation of the seedling planting device 23, the operation lever 16 is tilted in the reverse direction. For example, when the lowering movement of the seedling planting device 23 is stopped halfway, the work lever 16 may be tilted backward. When the operation lever 16 is tilted once to the left, the left line marker 33 is in the working posture, and when it is tilted once again to the left, the left line marker 33 returns to the non-working posture. When the work lever 16 is tilted once to the right, the right line marker 33 is in the working position, and when it is tilted 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 protrudes outward from the left and right side surfaces of the engine 5. An engine output pulley 72 is provided at the protruding end of the output shaft 70 that protrudes from the left side of the engine 5, a mission input pulley 73 is provided at the mission input shaft 71 that protrudes outward from the mission case 6, and is transmitted to both pulleys 72, 73. A belt is wrapped around. Power is transmitted from the engine 5 to the transmission case 6 via both pulleys 72 and 73 and a transmission belt.

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

Part of the branching power toward the front and rear wheels 3 and 4 is transmitted from the gear-type auxiliary transmission mechanism 42 via the differential gear mechanism 45 to the front axle 36 of the front axle case 7 to drive the left and right front wheels 3 to rotate. . The remainder of the branching power toward the front and rear wheels 3, 4 is transferred from the gear-type sub-transmission mechanism 42 through the universal joint shaft 46, the 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. Thus, the rear axle case 9 is transmitted to the rear axle 37 to drive the left and right rear wheels 4 to rotate. When the traveling brake 44 is operated, the output from the gear-type subtransmission mechanism 42 is lost, so that the front and rear wheels 3 and 4 are braked. When the rice transplanter 1 is turned, the friction clutch 48 inside the turning inside the rear axle case 9 is turned off to rotate the rear wheel 4 inside the turning freely, and the rotation of the rear wheel 4 outside the turning to which power is transmitted is rotated. It turns by driving.

In the rear axle case 9, a rotor drive unit 86 having a leveling rotor clutch for power transmission to the leveling rotor 85 is provided. The power transmitted from the gear-type subtransmission 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. The farm scene is leveled by the rotational drive of the leveling rotor 85.

The branching power toward the seedling planting device 23 is transmitted to the inter-stock transmission case 75 via the PTO transmission shaft mechanism 74 with a universal joint shaft. In the inter-strain shifting case 75, an inter-strain shifting mechanism 76 that switches between seedlings to be planted, for example, to sparse planting, standard planting, or dense planting, and a planting clutch 77 that interrupts power transmission to the planting planting device 23 I have. The power transmitted to the inter-plant transmission case 75 is transmitted to the planting input case 26 via the inter-plant transmission mechanism 76, the planting clutch 77, and the universal joint shaft 78.

In the planting input case 26, a seedling horizontal feed mechanism 79 that moves the seedling platform 29 laterally, a seedling vertical feed mechanism 80 that transports the seedling mat on the seedling platform 29 vertically, and a planting input case 26 and a planting output shaft 81 that transmits power to each planting transmission case 27. The seedling table lateral feed mechanism 79 and the seedling vertical feed mechanism 80 are driven by the power transmitted to the planting input case 26, and the seedling stage 29 is continuously reciprocally moved laterally, so that the seedling stage 29 is reciprocated. When reaching the end (the turning point of the reciprocating movement), the seedling mat on the seedling placing table 29 is intermittently transported vertically. Power from the planting input case 26 via the planting output shaft 81 is transmitted to each planting transmission case 27, and the planting transmission case 27 and the planting claw 30 of each planting transmission case 27 are driven to rotate. In addition, when providing a fertilizer, motive power is transmitted from the inter-strain transmission case 75 to a fertilizer.

In the planting input case 26, a left and right longitudinal intermediate shaft 211 and a seedling stage drive shaft 212 are arranged in parallel. The power transmitted to the planting input case 26 is transmitted to the lateral feed mechanism 79 and the seedling vertical feed mechanism 80 via the intermediate shaft 211 and the seedling stage drive 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 plural lateral feed adjusting drive gears 213 is selectively powered from the intermediate shaft 211 by a slide key 215 that can be slid by a slide lever (not shown) provided in the planting input case 26. Then, the seedling stage drive shaft 212 is rotated.

Each group of the lateral feed adjusting gears 213 and 214 has a different ratio of the number of teeth. When the combination of the lateral feed adjusting gears 213 and 214 is changed, the rotation ratio of the seedling stage drive shaft 212 is changed. As a result, the lateral feed pitch of the seedling mount 29 changes, and the amount of seedling scraping of the seedling mat changes. In the embodiment, there are four types of combinations of the transverse feed adjusting gears 213 and 214, and the number of transverse feeds is set to any one of 18, 20, 26, and 30 times. Here, the number of times of horizontal feeding means the number of times the two planting claws 30 scrape seedlings from the seedling mat while the seedling mounting base 29 is laterally fed to the left or right moving end. Yes. The combination of the transverse feed adjusting gears 213 and 214 corresponding to the number of transverse feeds 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. The hydraulic circuit 90 of the rice transplanter 1 includes a hydraulic pump 40 a and a hydraulic motor 40 b that 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 40 a and the hydraulic motor 40 b are connected to the respective suction side and discharge side via a closed loop oil passage 93. A 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 speed change electric motor according to the depression amount of the travel speed change pedal 12, and the hydraulic motor 40b is driven forward or reverse.

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 handle 14, the steering hydraulic pressure switching valve 94 is switched to drive the steering hydraulic motor 95 to assist the operation of the steering handle 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 is branched 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 switching type mechanical switching that can be switched between 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 seedling planting device 23 moves up and down via the lifting link mechanism 22 by operating the work lever 16 to switch the lifting switching valve 99 to expand and contract the lifting cylinder 39. The flow divider 96 and the up / down switching valve 99 are accommodated in a valve unit 89 provided at the rear of the mission case 6.

An electromagnetic on-off valve 101 is provided in the cylinder oil passage 100 from the elevating switching valve 99 to the elevating cylinder 39. The electromagnetic on-off valve 101 is an electromagnetic control valve that can be switched between two positions: an open position 101a for supplying and discharging hydraulic oil to and from the lift cylinder 39 and a closed position 101b for stopping supply and discharge of hydraulic oil to and from the lift cylinder 39. is there. Accordingly, when the electromagnetic solenoid 102 is excited to open the electromagnetic on-off valve 101 to the open position 101a, the lifting cylinder 39 can be expanded and contracted, and the seedling planting device 23 can be moved up and down. When the electromagnetic solenoid 102 is de-energized and the electromagnetic on-off valve 101 is moved to the closed position 101b by the return spring 103, the elevating cylinder 39 is held so as not to expand and contract, and the seedling planting device 23 stops elevating at an arbitrary height position.

An accumulator 105 is connected between the electromagnetic on-off valve 101 and the lift cylinder 39 in the cylinder oil passage 100 via an accumulator oil passage 104. When the operating hydraulic pressure in the elevating cylinder 39 changes suddenly, the operating hydraulic pressure fluctuation is absorbed by the accumulator 105, and the elevating cylinder 39 is smoothly expanded and contracted by the combination of the elevating switching valve 99 and the electromagnetic on-off valve 101, so The device 23 is moved up and down easily.

The second oil passage 98 of the flow divider 96 is connected to a rolling control unit 106 that controls the right / left inclined posture of the seedling planting device 23. The rolling control unit 106 incorporates an 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 adjustment 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 the four sets of planting transmission cases 27 for 8 strips. The planting frame 111 extends in the left-right direction. A planting input case 26 is attached to the center of the planting frame 111. The planting input case 26 includes a horizontal feed shaft of a seedling table lateral feed mechanism 79 that laterally feeds the seedling stage 29 and a vertical direction of a seedling vertical feed mechanism 80 that vertically feeds the seedlings on the seedling stage 29. The feed drive shaft 80a and the planting output shaft 81 of the seedling planting mechanism 28 are rotated.

A planting depth adjusting shaft 121 is pivotally supported under the front end of the planting transmission case 27 so as to be rotatable. Brackets 113a and 113b disposed on the upper surfaces of the rear end portions of the floats 32a and 32b are connected to the planting depth adjusting shaft 121 through planting depth adjusting links 114a and 114b. Further, 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 and positioned by the planting depth adjusting actuator mechanism 171 using the planting depth adjusting shaft 121 as a rotation fulcrum. By adjusting the position of the planting depth adjusting member 122, the height positions of the brackets 113a and 113b via the planting depth adjusting shaft 121 and the planting depth adjusting links 114a and 114b, and the floats 32a and 32b (adjusted bodies) ) Is arranged at a desired planting depth setting height. A sensing arm of the lift sensor mechanism 311 is attached to the front end portion of the center float 32a. The lift sensor mechanism 311 detects a change in the float inclination angle (planting depth). A surface detection sensor mechanism 331 attached to the front surface of the planting frame 111 is disposed above the center float 32a. The surface detection sensor mechanism 331 detects a change in the surface position of the field. A float accommodation mechanism 116 that restricts the vertical movement range of the front end portion of the side float 32b is attached to the front end portion of the side float 32b.

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 fixed at the substantially center of the planting frame 111 via a rolling fulcrum shaft 142. A 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 reciprocates the double-acting cylinder 108. A rolling correction spring 149 is provided between a receiving plate 148 fixed on the upper surface of the mounting seat 143 and a pair of spring hooks provided on the upper rail frame 151 on the back side of the seedling mount 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 advance and retreat, and the seedling planting device 23 is swung left and right around the rolling fulcrum shaft 142. The seedling planting device 23 is configured to be held horizontally.

In addition, a seedling horizontal feed mechanism 79 and a seedling vertical feed mechanism 80 are connected to the planting input case 26. The feed body 79 a of the seedling table lateral feed mechanism 79 is connected to the lower back side of the seedling table 29 and moves the seedling table 29 in the lateral direction along the upper rail frame 151 and the lower rail frame 152. . For this reason, the seedling mat on the seedling placing table 29 is continuously fed back and forth in a reciprocating manner. On the other hand, a pair of vertical feed drive cams 80b are fixed to the vertical feed drive shaft 80a of the seedling vertical feed mechanism 80. When the seedling stage 29 reaches the reciprocating end (return point of reciprocating movement), each vertical feed drive cam 80b that is rotationally driven by the vertical feed drive shaft 80a comes into contact with the tip of the driven cam 153 and follows 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 base 29 is intermittently transported vertically toward the seedling extraction side (the inclined lower end side of the seedling mounting base 29).

The seedling vertical feed belt 155 includes a vertical feed drive roller attached to a left and right horizontally long vertical feed drive roller shaft 154 provided on the lower end side of the seedling mount 29, and a left and right horizontally long vertical feed provided in the middle part of the seedling mount 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 seedling vertical feeding belt 155, the lower end side of the inclined surface of the seedling mat mounting surface of the seedling mounting table 29 (seedlings) The seedling mat is transported vertically toward the take-out side). The length of the seedling feeding surface of the seedling vertical feeding belt 155 is longer than the length of one seedling mat. In addition, the seedling collection interlocking cam 138 fixed to the seedling collection adjusting shaft 136 and the driven cam 153 attached to the vertical feed drive roller shaft 154 are connected via an interlocking wire 156 to cope with a change in the seedling vertical harvesting amount. Then, the vertical seedling feed amount is also changed, and appropriate vertical seedling feed according to the vertical seedling collection amount is performed.

In addition, as shown in FIG. 12, the seedling planting device 23 is provided with a seedling adjustment tool 132 that adjusts the vertical seedling collection amount by moving the seedling extraction plate 131 at the lower end of the seedling mount 29 up and down. . The seedling adjustment tool 132 is fixed to an upper portion of a guide rod 134 supported by a guide member 133 bolted to the planting transmission case 27 so as to be movable up and down. A base end portion of a seedling adjustment cam 135 is fixed to a seedling adjustment shaft 136 extending in the left-right direction. The tip of the seedling adjustment cam 135 is inserted into the seedling adjustment tool 132. Further, a base end portion of the seedling adjustment member 137 is fixed to the seedling adjustment shaft 136. The position of the seedling adjustment member 137 is adjusted via the connecting member 139 by the seedling adjustment actuator mechanism 181, whereby the seedling extraction plate 131 and the seedling adjustment tool 132 are connected via the seedling adjustment shaft 136 and the seedling adjustment cam 135. And the guide rod 134 is moved up and down, and the amount of seedlings for one strain taken out by the planting claws 30 is adjusted. The seedling adjustment shaft 136 is rotatably supported by each bearing plate fixed to the upper part of the planting transmission case 27.

Next, the detailed structure of the seedling planting mechanism 28 and its surroundings will be described with reference to FIGS. A seedling extraction plate 131 having a seedling outlet 220 is disposed behind the planting input case 26 so as to extend substantially horizontally. A lower rail frame 152 extending in a substantially horizontal horizontal direction is fixed to the lower part of the back surface of the seedling table 29. A lower slide shoe 223 provided on the seedling extraction plate 131 is slidably fitted into the lower rail frame 152 from below.

At the location of each seedling outlet 220 on the seedling extraction plate 131, an outlet cover 226 that surrounds the inner peripheral edge of the seedling outlet 220, and a planting claw clamping guide 227 that clamps the midway portion of the planting claw 30 from both the left and right sides. A planting claw tip guide 228 facing the tip side of the planting claw 30 is detachably attached. In this case, the mounting holes 242 on the upper end side of the planting claw tip guide 228 and the mounting holes for the outlet cover 226 are provided in the bolt mounting holes 241 provided at two locations in the vicinity of each seedling outlet 220 in the seedling extraction plate 131. 243 and the mounting hole 244 on the upper end side of the planting claw clamping guide 227 are fastened together by bolts 229 in a state of being sequentially overlapped. The presence of the outlet cover 226 contributes to improving the strength of each seedling outlet 220 on the seedling extraction plate 131 and stabilizing the scraping amount of the seedling mats by the planting claws 30. The upper ends of the planting claw tip guide 228 and the planting claw pinching guide 227 also contribute to improving the strength of each seedling outlet 220 by the joint fastening structure.

In the embodiment, two types of outlet units 230 are prepared by combining the outlet cover 226, the planting claw pinching guide 227, and the planting claw tip guide 228. One is for seedling mats for high-density seedlings, and the other is for seedling mats for standard seedlings. Depending on which specification seedling mat is used, the outlet unit 230 is replaced. The groove width dimension ΔW of the opening groove 231 through which the planting claw 30 passes in the take-out cover 226 is varied widely for high-density raising seedlings and standard raising seedlings. As shown in FIG. 18, the groove width dimension ΔWa (see (A)) of the outlet cover 226a for high-density seedling is larger than the groove width dimension ΔWb (see (B)) of the outlet cover 226b for standard seedling raising. Is also set narrow.

In this embodiment, the mounting holes 244 of the planting claw clamping guide 227 are formed horizontally long, and the mounting position of the planting claw clamping guide 227 to the seedling extraction plate 131 is determined according to the seedling outlet 220 of the extraction plate 131. And the bolt mounting hole 241 are adjustable in the width direction of the opening groove 231. Thereby, the planting claw pinching guide 227 having the same shape can be adapted to both the groove width dimension ΔWa of the outlet cover 226a for high density seedling raising and the groove width dimension ΔWb of the outlet cover 226b for standard type seedling raising. Therefore, the planting claw clamping guide 227 can be shared by the outlet unit 230 for the seedling mat for high-density seedlings and the outlet unit 230 for the seedling mat for the standard breeding seedling. Manufacturing cost can be reduced.

As shown in FIGS. 13 and 19, the planting claws 30 and the U-shaped extruded pieces 234 that push 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 that slides the extruded piece 234 along the planting claw 30. The planting claw 30 is detachably attached to the claw case 236 located at both longitudinal ends of the rotary case 31 with a dimensioning bolt 237 and a nut 238. The extruded piece 234 is fixed to the tip of the push rod 235.

As shown in FIG. 20, in the embodiment, two kinds of planting claws 30, push pieces 234, and push rods 235 are prepared as planting claw units. One is for seedling mats for high-density seedlings, and the other is for seedling mats for standard seedlings. The tip end side of the planting claws 30a for high-density seedling raising is configured to be narrower than the base end side.

On the other hand, the outer side of the bifurcated upper end of the extruded piece 234a for high-density seedling raising is formed into a chamfered shape with corners cut off so as to incline downward from the inside to the outside. 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 extruding piece 234a are configured to be narrow, it is possible to easily scrape one seedling from a seedling mat for high-density raising seedlings. However, the scraped seedling can be prevented from clogging in the U-shaped extruded piece 234a. On the other hand, the extrusion piece 234b for standard seedling raising is formed with a substantially uniform thickness. The bifurcated upper end side of the extruded piece 234b is slidably brought close to the back surface of the tip side of the planting claw 30b for standard breeding seedlings.

Next, the shape of the planting claw will be described with reference to FIGS. The planting claws 30a for high density seedlings and the planting claws 30b for standard seedlings are provided in a protruding manner in the same direction on the mounting surface portion 301a or 301b and on both sides along the longitudinal direction of the mounting surface portion 301a or 301b. The rib portions 302a, 302a or 302b, 302b 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 thicknesses of the mounting surface portions 301a and 301b and the rib portions 302a and 302b are substantially the same. The length LA of the planting claw 30a and the length LB of the planting claw 30b are the same.

The planting claws 30a and 30b include a pair of claw portions 305a and 305a or 305b and 305b in which a tip end portion (one end side) 303a or 303b is bifurcated in a bifurcated manner from the branch portion 304a or 304b. 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 portion 303a of the planting claw 30a is smaller than the planting claw width WB of the tip portion 303b of the planting claw 30b. The groove width WAs between the claws 309a of the planting claw 30a and the groove width WBs between the claws of the groove 309b between the claws 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.

23, the closed end portions (end portions on the claw root portions 361a and 361b side) 310a and 310b of the inter-claw grooves 309a and 309b are formed to have 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 plan view. In addition, the claw inner peripheral portions 362a and 362b of the claw root portions 361a and 361b of the claw portions 305a and 305b have a virtual half whose diameter is the groove width WAs and WBs between the claws and the center of the arc is located at the top of the closed end portions 310a and 310b. The claw portions 305a and 305b are located on the tip side of the circle 363. That is, the claw inner peripheral edge portions 362 a and 362 b are formed more gently than the virtual semicircle 363. Further, the claw inner peripheral edge portions 362a and 362b are inclined from the position on the tip side of the claw portions 305a and 305b to the center line side between the claw grooves 309a and 309b with respect to the virtual semicircle 363. With this shape, the widths of the claw root portions 311a and 311b of the claw portions 305a and 305b in the bifurcated branch portions 304a and 304b are formed thicker in plan view, and the strength of the claw root portions 311a and 311b is improved. Thereby, in the planting claws 30a and 30b, it is possible to prevent irreversible deformation of the claw root portions 311a and 311b when the seedlings are scraped, and the distance between the tips of the claw portions 305a and 305a or 305b and 305b is deformed. Can be prevented, and appropriate seedling scraping can be realized. Such a shape of the inter-claw groove 309a and the claw root portion 361a is particularly effective for the planting claw 30a for high-density raising seedlings in which the claw width WAc of the claw portion 305a is small.

The rib portions 302a and 302b are formed from the front end portions 303a and 303b to the base end portions (the other end sides) 306a and 306b on both sides in the longitudinal direction of the mounting surface portions 301a and 301b. The rib portions 302a and 302b are provided so that the rib height increases from the tip ends of the claw portions 305a and 305b toward the branch portions 304a and 304b, and positions closer to the base end portions 306a and 306b than the branch portions 304a and 304b. The rib height is the highest. Further, the rib portions 302a and 302b are provided so that the rib height decreases from the place where the rib height is the highest toward the base end portions 306a and 306b to the approximate center position in the longitudinal direction of the mounting 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 ribs 302a and 302b have substantially the same side view shape (see FIGS. 21B and 22B).

The base end widths WAr and WBr at the base end portions 306a and 306b of the planting claws 30a and 30b are the same. In the base end portions 306a and 306b, two mounting holes 307a and 307a or 307b and 307b arranged in the longitudinal direction are formed in the mounting surface portions 301a and 301b. The planting claws 30 a and 30 b are detachably attached to the claw case 236 by nuts 238 by inserting mounting holes 307 a and 307 a or 307 b and 307 b into the dimension 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. Thereby, the front-end | tip part of rib part 302a, 302b in nail | claw part 305a, 305b is formed in thin and substantially pointed shape, and the approach property to the seedling mat of nail | claw part 305a, 305b and cutting performance are improved. .

Here, the inclined surface portion 308b of the planting claw 30b is provided on the distal end side with respect to the branch portion 304b, whereas the inclined surface portion 308a of the planting claw 30a extends to the proximal end portion 306a side with respect to the branch portion 304a. Is provided. Thereby, the ease of entering the seedling mat of the claw portion 305a of the planting claw 30a and the cutting performance are further improved. Further, the inclined surface portion 308a of the rib portion 302a is extended to the base end portion 306a side with respect to the branch portion 304a, whereby the thickness of the distal end portion of the rib portion 302a is reduced in the vicinity of 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 point shape rather than a semicircular shape in a plan view, and the width of the claw root portion 311a of the claw portion 305a is formed thick in a plan view. As a result, the strength of the branched portion 304a is improved. Therefore, even if the thickness of the tip of the rib portion 302a is reduced in the vicinity of the branch portion 304a, the physical strength of the branch portion 304a is such that the branch portion 304a is not irreversibly deformed 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 embodiment, the plate- like planting claws 30a and 30b obtained by bending a plate-like metal material are detachably attached to the rice transplanter 1, but the planting claws to be attached to the rice transplanter 1 are Also, a planting claw (also referred to as a hail claw) having a pair of needle-like claw portions may be used. In such a planting claw, it is preferable that the closed end portions of the groove between the claw portions of the pair of needle-like claw portions are formed in a point shape rather than a semicircular shape in plan view. Thereby, similarly to the planting claws 30a and 30b of the above-described embodiment, both the claw root portions of the pair of needle claw portions are thickened in the width direction in plan view, and the strength of the claw root portions of the needle claw portions is increased. It can be improved. As a result, it is possible to prevent irreversible deformation of the claw root portion of the needle-like claw portion, and to prevent the distance on the tip side of the needle-like claw portion from being deformed, thereby realizing appropriate scraping of the seedling.

As described above, the planting claws 30a and 30b for the rice transplanter 1 are for scraping off one seedling from the seedling mat placed on the seedling stand 29 as described in the above embodiment. And a pair of claw portions 305a, 305a or 305b, 305b formed by bifurcating the tip (one end side) 303a or 303b, and a 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 claw root portion 361a or 361b side) 310a or 310b formed in a point shape rather than a semicircular shape in plan view. As a result, 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 increased. Strength can be improved. As a result, irreversible deformation of the claw root portions 361a and 361b of the claw portions 305a and 305b can be prevented, and the distance between the tips of the claw portions 305a and 305b can be prevented from being deformed. realizable.

Further, in the planting claw 30a for the rice transplanter 1, the distal end 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 improving the strength of the nail root portion 361a of the nail portion 305a while preventing the irreversible deformation of the nail root portion 361a of the nail portion 305a, while reducing the scraping area of one seedling, It can prevent that the space | interval of the front end side of the nail | claw part 305a can deform | transform, and can implement | achieve appropriate scraping of the seedling from the seedling mat of a high-density raising seedling.

Further, the rice transplanter 1 includes a seedling planting device 23 that scrapes seedlings from a seedling mat placed on the seedling platform 29 with the planting claws 30 to plant the seedlings on a farm field. Since 30b is provided, while the reliability regarding the planting nail | claw 30 can be improved, interruption of the seedling planting operation resulting from a deformation | transformation of the planting claw 30 can be suppressed, and a smooth seedling planting operation can be performed.

Next, the 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 with reference to FIGS. In this embodiment, the gap between the planting claws 30a for high density seedling raising and the outlet cover 226a is wider than the gap between the planting claws 30b for standard type seedling raising and the outlet cover 226b. Here, the width of the planting claw at the tip of the planting claw 30a for relatively high density seedling raising is WA, and the width of the opening groove 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 relatively wide standard seedling planting claw 30b 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 planting claw width WA is narrower than the planting claw width WB. The opening groove width ΔWa is narrower than the opening groove width ΔWb. In this embodiment, the opening groove width ΔWa of the outlet cover 226a for high-density seedling is wider than the planting claw width WB of the standard seedling planting claw 30b.

The gap ΔWa-WA between the planting claw 30a and the seedling outlet cover 226a is larger than the product of the gap ΔWb-WB between the planting claw 30b and the seedling outlet cover 226b and the reduction ratio WA / WB. Has been. That is, instead of setting the opening groove width ΔWa for high-density seedling by reducing the opening groove width ΔWb by reducing the ratio WA / WB of the planting claw width WA to the planting claw width WB for standard seedling raising, The groove width ΔWa is larger than 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 larger than the ratio ΔWb / WB between the planting claw width WB and the opening groove width ΔWb. Thereby, regarding the planting claw width WA of the planting claw 30a for high-density seedling raising and the opening groove width ΔWa of the outlet cover 226a, the planting claw width WB and the opening groove width ΔWb for standard breeding seedling are reduced at the same reduction ratio. The gap ΔWa-WA between the planting claw 30a and the opening groove 231 of the seedling outlet cover 226a can be increased as compared with the case of simply reducing. Then, seedlings can be prevented from clogging in the gap, and one seedling can be appropriately scraped from the seedling mat for high-density seedling raising.

Furthermore, in the embodiment, the gap ΔWa-WA between the planting claws 30a for high-density seedlings and the seedling outlet cover 226a is larger than the gap ΔWb-WB between the planting claws 30b for standard seedlings and the seedling cover 226b. Increased. As a result, it is possible to more reliably prevent the seedling from being clogged in the gap between the planting claw 30a and the opening groove 231 of the seedling outlet cover 226a, and more appropriately scrape one seedling from the seedling mat of high-density seedling raising. be able to.

Even if the gap ΔWa-WA is the same as the gap ΔWb-WB, it prevents the seedling from clogging in the gap between the planting claw 30a and the opening groove 231 of the seedling outlet cover 226a, and the seedling mat for high-density seedling raising 1 seedling can be scraped off appropriately. Further, even if the gap ΔWa−WA is smaller than the gap ΔWb−WB, the same operation and effect as the above embodiment can be obtained as long as it is larger than the product of the gap ΔWb−WB and the reduction ratio WA / WB.

Further, in the embodiment, the opening groove width ΔWa of the seedling inlet cover 226a for high-density seedling raising is wider than the planting claw width WB of the standard type seedling planting claw 30b. Even if the seedling planting mechanism 28 is driven in a state where the outlet cover 226a is attached to the seedling outlet 220 of the seedling extraction plate 131 and the planting claw 30b is attached to the claw case 236, the outlet cover 28 is driven. 226a and planting claw 30b do not contact. As described above, even when the operator attaches the outlet cover 226a for high-density seedling and the planting claw 30b for standard seedling to the rice transplanter 1, the contact between the outlet cover 226a and the planting claw 30b is contacted. Further, damage to the drive mechanism inside the nail case 236 and the seedling planting mechanism 28 can be prevented.

As described above, the rice transplanter 1 scrapes seedlings from the seedling mat placed on the seedling placing stand 29 with the planting claws 30 that are detachably attached to the nail case 236 and plant the seedlings on the field. An outlet cover 226 having an opening groove 231 through which the planting claws 30 pass is detachably attached to the seedling outlet 220 of the seedling extraction plate 131 provided with the seedling planting device 23 and disposed below the seedling mount 29. A set of the planting claw 30 and the outlet cover 226 is a combination of the planting claw 30a having the planting claw width WA and the outlet cover 226a having the opening groove width ΔWa or a planting claw width wider than the planting claw width WA. It can be exchanged for 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 the difference between the planting claw width WA and the opening groove width ΔWa. WA is the planting claw width WB and the opening groove width ΔWb. Is larger than the product of the gap ΔWb-WB and the reduction ratio WA / WB, so that the planting claw width WB and the opening groove of the wide planting claw 30b and the outlet cover 226b are combined. Compared with the case where the width ΔWb is reduced at the same reduction ratio and the planting claw width WA and the opening groove width ΔWa of the narrow planting claw 30a and the outlet cover 226a are set, the planting claw 30a and the outlet The gap ΔWa-WA of the opening groove 231 of the cover 226a can be widened, and seedling can be prevented from being clogged in the gap. Then, if a set of a narrow planting claw 30a and an outlet cover 226a is used, the planting claw 30a can reduce the area of scraping off the seedling mat, and the seedlings for one strain can be appropriately removed from the seedling mat. Can be scraped off.

Further, in the rice transplanter 1, the gap ΔWa-WA is made larger than the gap ΔWb-WB. Therefore, when the pair of the narrow planting claw 30a and the outlet cover 226a is used, the planting claw 30a and the outlet cover 226a are used. It is possible to more reliably prevent seedlings from being clogged in the gaps of the open grooves 231 and more appropriately scrape one seedling from the seedling mat while reducing the area where the planting claw 30a scrapes the seedling mat. Can do.

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

DESCRIPTION OF SYMBOLS 1 Rice transplanter 29 Seedling platforms 30, 30a, 30b Planting claws 23 Seedling planting device 131 Seedling extraction plate 220 Seedling outlet 226, 226a, 226b Exit cover 231 Opening groove 236 Claw case

Claims (2)

1. In a rice transplanter equipped with a seedling planting device for scraping seedlings from a seedling mat placed on a seedling stand with planting claws detachably attached to a nail case and planting them on a farm field,
   Removably attach an outlet cover having an opening groove through which the planting claws pass, to a seedling outlet of the seedling extraction plate arranged below the seedling mount,
   A set of the planting claw and the outlet cover is a group of a planting claw having a planting claw width WA and an outlet cover having an opening groove width ΔWa, or a planting claw width WB wider than the planting claw width WA. Can be replaced with a set of a planting claw and an outlet cover 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 the difference between the gap ΔWb−WB, which is the difference between the planting claw width WB and the opening groove width ΔWb, and the reduction ratio WA / WB. Is larger than the product value,
   Rice transplanter.
2. The gap ΔWa-WA is larger than the gap ΔWb-WB.
   The rice transplanter according to claim 1.

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