WO2018074180A1 - Rice transplanter - Google Patents

Abstract

A rice transplanter 1 comprises: a seedling planting device 23 that uses a planting fork 30 to scrape a seedling from a seedling mat and plant the seedling in a field, said seedling mat being mounted on a seedling mount 29; and a raising/lowering control mechanism 39 that controls the raising/lowering of the seedling planting device 23 on the basis of a detected value from a raising/lowering sensor 325, said raising/lowering sensor 325 detecting the tilt angle of a float 32a that adjusts a seedling planting depth. The present invention is configured such that when planting a seedling mat with high-density seedling growth, the seedling planting depth is deeper than when planting a seedling mat with standard seedling growth, in which seedlings are grown at a lower density than in the seedling mat with high-density seedling growth.

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, while continuously feeding the seedling platform on which the seedling mat is placed at a predetermined interval, by rotating the planting claw directed toward the seedling platform 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 seedling mat for high-density seedlings, the area to scrape the seedling mat with the planting nails compared to when using the seedling mat for standard seedlings so that the number of seedlings per plant to be scraped off from the seedling mat is appropriate. So that the seedling planting conditions of the rice transplanter are set by the operator. 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

In the rice planting work using a seedling mat of high-density seedlings, the area where the planting claws scrape off the seedling mat is small, so that there is a problem that the seedlings planted on the field float and the floating seedlings are easily generated.

The present invention has been made in view of the above-described present situation, and a technical problem is to prevent floating seedlings when using a seedling mat for high-density seedlings.

The rice transplanter according to the present invention includes a seedling planting device for scraping seedlings from a seedling mat placed on a seedling stand with planting claws and planting them on a field, and an inclination angle of a float for adjusting the seedling planting depth And a lifting control mechanism that controls the raising and lowering of the seedling planting device based on the detection value of the lifting sensor, and when planting the seedling mat of the high-density raising seedling, the seedling mat of the high-density raising seedling Compared to the time of planting a seedling mat of a standard type seedling in which seedlings are grown at a lower density than that of the seedling, the planting depth of the seedling is increased.

In the rice transplanter of the present invention, when planting the seedling mat of the high-density seedlings, the sensitivity of the lifting control mechanism is corrected to the insensitive side so that the seedling planting depth is increased. Also good.

In the rice transplanter of the present invention, the float is positioned in accordance with the displacement of the planting depth adjusting member whose position is adjusted by the planting depth adjusting actuator mechanism, and the seedling mat for the high-density seedling raising is planted Sometimes, the float position may be corrected to the ascending side so as to increase the seedling planting depth.

The rice transplanter of the present invention has a seedling planting device for scraping seedlings from a seedling mat placed on a seedling stand with planting claws and planting them on a field, and an inclination angle of a float for adjusting the planting depth of the seedlings. In a rice transplanter equipped with a lifting control mechanism that controls the raising and lowering of the seedling planting device based on the detection value of the lifting sensor to be detected, the seedling is lower than the seedling mat of the high density raising seedling when planting the seedling mat of the high density raising seedling. Compared with the planting mat of standard type seedlings grown at high density, the planting depth of the seedlings is deeper than that at the time of planting. Even if the area for scraping the seedling mat is small, floating seedlings can be prevented.

Further, in the rice transplanter of the present invention, when planting a seed mat for high-density seedlings, if the sensitivity of the lifting control mechanism is corrected to the insensitive side and the seedling planting depth is increased, the planting depth Without separately providing a member for increasing the depth, it is possible to simply increase the depth of seedling planting and prevent floating seedlings simply by correcting the sensitivity of the lifting control mechanism when planting a seedling mat for high-density seedlings.

Further, in the rice transplanter of the present invention, the float is adjusted in accordance with the displacement of the planting depth adjusting member whose position is adjusted by the planting depth adjusting actuator mechanism, and the seedling mat is planted with a high density seedling Sometimes, if the planting depth of the seedling is increased by correcting the float position to the ascending side, the seedling mat for high-density seedling raising can be planted without separately providing a member for increasing the planting depth. Sometimes, by simply correcting the position of the float, the planting depth of the seedling can be easily increased to prevent floating seedlings.

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 front perspective view for demonstrating an actuator mechanism cover. It is a perspective view for demonstrating a planting depth adjustment actuator mechanism. It is a right view for demonstrating operation | movement of the planting depth adjustment actuator mechanism. It is a perspective view for demonstrating a seedling adjustment actuator mechanism. It is a left view for demonstrating operation | movement of a seedling adjustment actuator mechanism. It is a top view for demonstrating a raising / lowering sensor mechanism and a surface detection sensor mechanism. It is a left side surface for demonstrating a raising / lowering sensor mechanism and a surface detection sensor mechanism. It is a rear view of a box application agent spreading machine. It is a left view of a box application agent spreader. It is side surface sectional drawing of a spraying unit. It is side surface sectional drawing of a spraying amount adjustment mechanism and a one-way clutch mechanism periphery. 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 the front view, top view, left side view, and right side view of an extrusion piece cover. It is a schematic functional block diagram regarding seedling planting control. It is a figure which shows the example of the selection item displayed on a liquid crystal panel. It is a flowchart for demonstrating one Embodiment of the setting of seedling planting conditions and seedling planting control. It is a flowchart for demonstrating other embodiment of the setting of seedling planting conditions and seedling planting control. It is a flowchart for demonstrating embodiment of the setting of seedling planting conditions and box application agent dispersion | distribution control.

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 (hydraulic lift control mechanism) is supported on the rear upper surface of the cylindrical 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 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 line. 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 hold each one of the seedlings and plant them on the rice 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 end sides of the 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 lift switching valve 99 is a four-port / two-switch mechanical switching that can be switched between two positions, a supply position 99a for supplying hydraulic oil to the lift cylinder 39 and a discharge position 99b for discharging hydraulic oil from the lift 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 adjusted by a planting depth adjusting actuator mechanism, which will be described later, with the planting depth adjusting shaft 121 as a pivot point. 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 by a seedling adjustment actuator mechanism 181 to be described later, whereby the seedling extraction plate 131, the seedling adjustment tool 132, and the guide rod 134 are connected via the seedling adjustment shaft 136 and the seedling adjustment cam 135. 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 configuration of the adjusting actuator mechanism group 161 including the planting depth adjusting actuator mechanism 171 and the seedling adjusting actuator mechanism 181 will be described with reference to FIGS. The adjustment actuator mechanism group 161 includes a planting depth adjustment actuator mechanism 171, a seedling adjustment actuator mechanism 181, and an actuator mechanism cover 162. The adjustment actuator mechanism group 161 is attached to the planting frame 111 at a position on the left side of the rolling fulcrum shaft 142. In the adjustment actuator mechanism group 161, the adjustment actuator mechanisms 171 and 181 are arranged adjacent to each other in the left-right direction. The seedling adjustment actuator mechanism 181 is disposed closer to the center of the traveling machine body 2 than the planting depth adjustment actuator mechanism 171.

The planting depth adjustment actuator mechanism 171 and the seedling adjustment actuator mechanism 181 basically have the same configuration. The adjustment actuator mechanisms 171 and 181 include feed screws 172 and 182, sliders 173 and 183, electric adjustment motors 174 and 184, feed screw upper support members 175 and 185, and feed screw lower support members 176 and 186. It has. As the feed screws 172 and 182 are rotated by the adjusting motors 174 and 184, the sliders 173 and 183 are linearly moved on the feed screws 172 and 182. The feed screw upper support members 175 and 185 rotatably support the upper end side (adjustment motor side) of the feed screws 172 and 182. The feed screw lower support members 176 and 186 rotatably support the lower ends of the feed screws 172 and 182. The adjustment actuator mechanisms 171 and 181 may be configured to include hydraulic motors that rotate the feed screws 172 and 182 instead of the electric adjustment motors 174 and 184.

In the actuator mechanism cover 162, a slider rotation prevention groove 164d opened along the feed screw 172 and a slider rotation prevention groove 164e opened along the feed screw 182 are formed. Anti-rotation protrusions 173a and 183a of the sliders 173 and 183 are inserted into the slider rotation prevention grooves 164d and 164e, respectively.

The operation of the planting depth adjusting actuator mechanism 171 will be described with reference to FIGS. The above-described planting depth adjusting member 122 is connected to the slider 173 of the planting depth adjusting actuator mechanism 171 through an accommodation mechanism. The distal end portion of the planting depth adjusting member 122 whose base end portion is fixed to the planting depth adjusting shaft 121 is disposed near the right side of the planting depth adjusting actuator mechanism 171 on the upper side of the planting frame 111. A proximal end portion of a rod-like member 123 extending forward and downward is attached to the distal end portion of the planting depth adjusting member 122. A pin member 124 projecting toward the planting depth adjusting actuator mechanism 171 is attached to the tip of the rod-shaped member 123. On the other hand, an engagement member 173 b having a groove with which the tip end portion of the pin member 124 is engaged is attached to the slider 173. In this way, the slider 173 of the planting depth adjusting actuator mechanism 171 and the planting depth adjusting member 122 are connected.

The planting depth adjustment actuator mechanism 171 is driven by a planting depth adjustment motor 174 according to a set planting depth adjusted by an item selector 291 (see FIG. 5) arranged in the operation unit 13. The slider 173 is moved by rotating 172. The position of the slider 173 is detected by, for example, a float position sensor 178 (here, a potentiometer) attached to the left side surface 164b of the feed screw cover member 164. When the engaging member 173b is moved together with the slider 173, the planting depth adjusting member 122 is rotated about the planting depth adjusting shaft 121 through the pin member 124 and the rod-shaped member 123, and the position is adjusted. By the rotation of the planting depth adjusting shaft 121, the planting depth adjusting shaft 121 and the above-mentioned planting depth adjusting links 114a and 114b are rotated, and the float 32 is an item selector 502 (see FIG. 5) arranged in the operation unit 13. ) Is set at a set planting depth position according to the set planting depth. The item selector 502 will be described later.

The operation of the seedling adjustment actuator mechanism 181 will be described with reference to FIGS. The aforementioned seedling adjustment member 137 is connected to the slider 183 of the seedling adjustment actuator mechanism 181 through an interchange mechanism. A proximal end portion of a connecting member 139 extending forward is attached to the seedling adjustment member 137. The distal end portion of the connecting member 139 is disposed on the upper side of the planting frame 111 and in the vicinity of the left side of the seedling adjustment actuator mechanism 181. A long hole 139 a is formed at the distal end of the connecting member 139 along the longitudinal direction of the connecting member 139. On the other hand, the slider 183 is provided with an engagement pin member 183b inserted into the elongated hole 139a via a pin support member 183c. By inserting the engaging pin member 183b into the elongated hole 139a of the connecting member 139, the slider 183 and the seedling adjusting member 137 of the seedling adjusting actuator mechanism 181 are connected.

The seedling adjustment actuator mechanism 181 moves the slider 183 by rotating the feed screw 182 by driving the seedling adjustment motor 184 according to the set seedling vertical adjustment amount adjusted by the item selector 502 (see FIG. 5). Let When the engaging pin member 183b is moved together with the slider 183, the seedling adjustment member 137 is rotated about the seedling adjustment shaft 136 via the connecting member 139, and the position is adjusted. The seedling adjustment cam 135 is rotated through the seedling adjustment shaft 136 by the rotation of the seedling adjustment member 137, and the seedling extraction plate 131 is set according to the set seedling vertical amount set by the item selector 502. Arranged at the sampling position. The position of the slider 183 is, for example, the position of the distal end portion of the detection rod-shaped member 188 whose base end portion is fixed to the seedling adjustment shaft 136 is attached to the planting frame 111 via the sensor bracket 189. It is detected by the seedling extraction plate sensor 190 (here, a potentiometer).

Next, the elevation sensor mechanism 311 and the surface detection sensor mechanism 331 will be described with reference to FIGS. The lift sensor mechanism 311 and the surface detection sensor mechanism 331 are attached adjacent to the center of the planting frame 111 above the center float 32a.

In the lift sensor mechanism 311, the lower end side of the sensing arm 312 is rotatably connected to the front part of the center float 32a via the bracket 313, and the upper end side of the sensing arm 312 is interlocked to the planting depth link mechanism 314. The planting depth link mechanism 314 includes a link bracket 315 fixed to the front surface of the planting frame 111, a link body 317 coupled to the link bracket 315 via a rotation support shaft 316, and a front portion of the link body 317. A sensor support member 319 connected via a connection pin 318 is provided. A correction arm 321 erected on the planting depth adjustment shaft 121 is connected to the lower portion of the link body 317 via a substantially U-shaped correction rod 320. The lower end of the rear side of the sensor support member 319 is connected to the sensor bracket 315 via a substantially U-shaped sensor link rod 322. A swing support shaft 323 arranged in the left-right direction is supported on the sensor support member 319. By the rotation of the planting depth adjustment shaft 121, the correction arm 321 and the correction rod 320 are displaced, the link body 317 rotates about the rotation support shaft 316, and the sensor support member 319 swings up and down.

The rear end of the left swing plate 324 is connected to the left end portion of the swing support shaft 323, and the upper end side of the sensing arm 312 is connected to the front portion of the left swing plate 324. In addition, the base end portion of the regulating plate 330 that interlocks with the left swing plate 324 is loosely fitted on the sensor support portion 319 side of the left swing plate 324 on the left end side of the swing support shaft 323. A lift sensor 325 (potentiometer here) is provided on the right side surface of the sensor support member 319 via a sensor bracket 326. The rear end of the right swing plate 327 is connected to the right end of the swing support shaft 323, and the detection arm 329 of the lift sensor 325 is engaged with the long groove 328 erected on the right side of the right swing plate 327 on the right side. Let The lift sensor 325 detects the amount of rotational displacement of the swing support shaft 323, and can detect a float angle (inclination angle) indicating the vertical posture of the center float 32a. A coil spring 350 is stretched between the front end portion of the restriction plate 330 and the front lower portion of the sensor support member 319, and a coil spring 351 is stretched between the front end portion of the right swing plate 327 and the front lower portion of the sensor support member 319. Has been.

The surface detection sensor mechanism 331 is attached to a link bracket 332 fixed to the front surface of the planting frame 111. The rear part of the link body 334 is connected to the upper part of the link bracket 332 via a rotation support shaft 333, and the upper part of the sector gear case 336 is connected to the front part of the link body 334 via a connecting rod 335. A portion closer to the lower right side of the sector gear case 336 is connected to the lower portion of the sensor bracket 332 via a substantially J-shaped sensor link rod 337. The right end portion of the connecting rod 335 is connected to the front left end portion of the substantially J-shaped sensor link rod 322 of the lift sensor mechanism 311 via the connecting plate 338. The sector gear case 336 swings up and down in conjunction with the displacement of the sensor support member 319 of the lift sensor mechanism 311 that swings up and down as the planting depth adjustment shaft 121 rotates.

The surface detection swing shaft 339 extending in the left-right direction is pivotally supported on the sector gear case 336 so as to be rotatable. The base end sides of the pair of left and right surface detection arms 340 and 340 are attached to the left and right ends of the surface detection swing shaft 339, and the surface detection bodies 341 and 341 are attached to the distal ends of the surface detection arms 340 and 340. A sensor shaft 342 that rotates in conjunction with the rotation of the surface detection swing shaft 339 via the sector gear pair 343 is provided in the sector gear case 336. A surface detection sensor 344 (here, a potentiometer) is provided on the left side surface of the sector gear case 336, and the detection shaft of the surface detection sensor 344 is connected to the left end portion of the sensor shaft 342. The surface detection sensor 344 detects the rotational displacement amount of the surface detection swing shaft 339 via the sector gear pair 343 and the sensor shaft 342, and the displacement of the surface detection bodies 341, 341 and the seedling planting device 23 from the surface of the field. The height up to a predetermined location (for example, the planting depth adjusting shaft 121) can be detected.

Next, the box application agent spreader 400 will be described with reference to FIGS. The box application agent spreader 400 includes a support frame 401 connected to the rear upper surface of the planting transmission case 27 of the seedling planting mechanism 28, and four spraying units 402 supported by the support frame 401. The four spraying units 402 are arranged side by side in the left-right direction at a position above the lower end portion of the seedling table 29 so as to face the seedling table 29.

Each spraying unit 402 feeds the box application agent by a predetermined amount from the hopper 403 that stores the granular box application agent by driving the feeding mechanism 404 toward the seedling mat placed on the seedling mounting table 29 from the spray nozzle 405. Spray box application. Each hopper 403 is bifurcated at the lower end side, the upper end and the lower end are opened, and the upper end opening is closed by a lid member 406 that can be opened and closed. A feeding mechanism 404 is connected to the lower end side of the bifurcated hopper 403. Each spraying unit 402 includes two sets of a feeding mechanism 404 and a spraying nozzle 405, and the feeding mechanism 404 and the spraying nozzle 405 are arranged so as to substantially coincide with the inter-strip pitch.

The feeding mechanism 404 feeds the box application agent in the hopper 403 to the spray nozzle 405 at a predetermined supply speed when the feeding roll 408 housed in the feeding case 407 is rotationally driven. The feeding roll 408 has a substantially disk shape, and a plurality of concave portions 408a are formed at equal intervals on the outer peripheral surface thereof. A gap between the feeding roll 408 and the side wall of the hopper 403 is filled with a brush-like member 409 disposed in front of the feeding roll 408 and a sealing member 410 disposed behind the feeding roll 408.

The feeding roll 408 is rotationally driven by a cylindrical feeding drive shaft 411 extending in the left-right direction. The driving force of the feeding drive shaft 411 is taken out from the planting transmission case 27. In this embodiment, a driving force extraction mechanism 412 connected to the rear portion of one planting transmission case 27 among the four planting transmission cases 27 is attached. The drive force take-out mechanism 412 has a rotational movement of the drive take-out shaft 413 transmitted from the inside of the planting transmission case 27, a crank plate 414 attached to the rear end of the drive take-out shaft 413, and a lower end side attached to the tip of the crank plate 414. The lower link rod 415 is converted into a vertical reciprocating motion. The upper end side of the lower link rod 415 is connected to a manual lever plate 416 rotatably attached to a lever plate support shaft 417 extending in the left-right direction, and the manual lever plate 416 is rotated and reciprocated. The rear end side of the upper link rod 418 arranged in the front-rear direction is connected to the manual lever plate 416, and the upper link rod 418 is reciprocated back and forth to transmit power to the one-way clutch mechanism 420.

The one-way clutch mechanism 420 converts the longitudinal reciprocating motion of the upper link rod 418 into a rotational reciprocating motion, and intermittently rotationally drives the transmission drive shaft 421 extending in the left-right direction. In the one-way clutch mechanism 420, the link lever member 422 is pivotally supported on the transmission drive shaft 421, and the front end side of the upper link rod 418 is connected to the upper portion of the link lever member 422. A clutch lever member 423 of a one-way clutch is rotatably supported on the transmission drive shaft 421 on the right side of the link lever member 422. A drive pin 424 that protrudes to the left is fixed to the base end portion side of the clutch lever member 423, and a regulation pin 425 that protrudes to the right side is fixed to the distal end portion side of the clutch lever member 423. The torsion coil spring 426 is externally fitted to the transmission drive shaft 421, one end side of the torsion coil spring 426 is hooked to the drive pin 424, and the other end side is hooked to the fixing member 427 fixed to the support frame 1. The drive pin 424 is biased toward the lower end portion of the link lever member 422 by the elasticity of the torsion coil spring 426. The link lever member 422 is driven to reciprocate and rotate by the reciprocating motion of the upper link rod 418, and the clutch lever member 423 of the one-way clutch is driven to reciprocate and rotate accordingly. Is intermittently rotated in one direction.

The rotation range of the clutch lever member 423 is limited by the spray amount adjusting mechanism 430. The spread amount adjusting mechanism 430 includes a spread amount adjusting member 433 that linearly moves on a feed screw 432 that is rotated by rotating the spread amount adjusting dial 431. The spreading amount adjusting member 433 includes a stopper member 434 at the lower end. The stopper member 434 is disposed on the arc locus of the restriction pin 425 of the clutch lever member 423 so that the position thereof can be adjusted. When the spreading amount adjusting member 433 and the stopper member 434 are moved away from the restriction pin 425, the rotatable range of the clutch lever member 423 increases, while the spreading amount adjusting member 433 and the stopper member 434 are moved to the restriction pin 425. When moved in the approaching direction, the rotatable range of the clutch lever member 423 becomes narrower. As the rotation range of the clutch lever member 423 is larger, the rotation angle of the transmission drive shaft 421 per reciprocation of the upper link rod 418 is larger, and therefore the rotation speed of the transmission drive shaft 421 is larger. On the contrary, the smaller the rotatable range of the latch lever member 423, the lower the rotational speed of the transmission drive shaft 421.

Rotational driving force of the transmission drive shaft 421 is transmitted to the feeding drive shaft 411 of the spraying unit 402 via a transmission mechanism 435 connected to both ends of the transmission drive shaft 421. Inside the transmission mechanism 435, a pair of gears (not shown) fixed to the feeding drive shaft 411 and the transmission driving shaft 421 one by one are arranged, and the feeding drive shaft 411 is driven to transmit by engagement of these gears. It rotates in the opposite direction to the shaft 421. The feeding roll 408 is intermittently rotated by the intermittent rotation drive of the feeding drive shaft 411, and the box application agent in the hopper 403 is sprayed toward the seedling mat via the recess 408 a of the feeding roll 408 and the spray nozzle 405. . Since the box application agent spreader 400 is fixed to the planting transmission case 27, the seedling mat on the seedling mounting table 29 is driven by the seedling table horizontal feed mechanism 79 and the seedling vertical feed mechanism 80 (see FIG. 6). It moves relative to 405 in the horizontal and vertical directions. Thereby, a box application agent is spread evenly on a seedling mat.

In the box application agent spreader 400, the rotational speed of the transmission drive shaft 421 is adjusted by adjusting the position of the spray amount adjusting member 433 and the stopper member 434 in the spray amount adjusting mechanism 430, whereby the rotational speed of the feeding drive shaft 411 is adjusted. By extension, the rotational speed of the feeding roll 408 is adjusted so that the amount of the box application agent sprayed from the spray nozzle 405 can be adjusted. The positions of the spray amount adjusting member 433 and the stopper member 434 are adjusted by a spray amount adjusting actuator mechanism 436 that is arranged adjacent to the right side of the spray amount adjusting mechanism 430 and rotates the feed screw 432. The application amount adjusting actuator mechanism 436 includes an application amount adjusting motor 437 that rotates the feed screw 432 and an application amount sensor 438 (here, a potentiometer) that detects the position of the application amount adjusting member 433. Based on the box application agent application amount set by an item setting unit 502 (see FIG. 5), which will be described later, the position of the application amount adjusting member 433 is adjusted to be the set application amount. It is also possible to manually adjust the spray amount by rotating the spray amount adjustment dial 431.

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. 29, 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. 25, 26, and 30, a planting claw 30 and a U-shaped extrusion for extruding a seedling sandwiched between the planting claws 30 are disposed at both longitudinal ends of each rotary case 31 in the seedling planting mechanism 28. A piece 234 and a push rod 235 for sliding the extruded piece 234 along the planting claw 30 are provided. The planting claw 30 is detachably attached to the planting main body 236 located on both longitudinal ends of the rotary case 31 with a dimension bolt 237 and a nut 238. The extruded piece 234 is fixed to the tip of the push rod 235.

As shown in FIG. 31, in the embodiment, two types of planting claws 30, a push piece 234 and a push rod 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. In this case, the tip of the planting claw 30b for standard type seedling is set to a width of about 14 mm, whereas the tip of the planting claw 30a for high-density seedling is set to a width of about 11 mm. .

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.

Further, as shown in FIG. 32, an extruded piece cover 251 is attached to the tip of the extruded piece 234a and push rod 235 for high-density breeding seedling, and the bifurcated upper end side of the extruded piece 234a and the extruded piece cover 251 is attached to the standard breeding seedling. You may make it make it adjoin to the back surface of the planting nail | claw 30b front side. The extruded piece cover 251 is substantially U-shaped, and comes into contact with a cavity 252 having an inner wall corresponding to the outer peripheral surface shape of the extruded piece 234a and the push rod 235, and a tip side portion of the inner wall bottom portion of the extruded piece 234a. It includes a front locking projection 253 and a pair of rear locking projections 254 that are in contact with the lower portion of the bifurcated rear side surface of the push piece 234a (the side surface on the proximal end side of the push rod 235). The extruded piece cover 251 is formed of a flexible material metal or resin.

The distal end portions of the extruded piece 234a and the extruded piece cover 251 are hollowed while increasing the distance between the rear locking projections 254 and 254 from the rear locking projection 254 side toward the front locking projection 253 side. Insert into 252. The front locking projection 253 abuts on the tip side portion of the bottom of the inner wall of the extruded piece 234a, and the rear locking projections 254 and 254 abut the rear side surface of the extruded piece 234a while holding the push rod 235. The extruded piece cover 251 is attached to the distal ends of the extruded piece 234a and the push rod 235. Accordingly, without replacing the extruded piece 234a and the push rod 235, the extruded piece planting claw 30a for high-density seedling is replaced with the planting claw 30b for standard breeding and only the extruded piece cover 251 is attached. Therefore, it can easily correspond to the seedling mat of standard type seedling raising. That is, both the seedling planting operation using the standard seedling seedling mat and the seedling planting operation using the high-density seedling seedling mat can be performed in one rice plant without performing the complicated push rod 235 replacement operation. It can be realized with a machine and can improve the versatility of rice transplanters.

Next, the control system of the rice transplanter 1 related to seedling planting will be described. As shown in FIG. 33, the traveling machine body 2 is equipped with a planting work controller 500 (control device) as a control means that mainly controls control related to the seedling planting device 23. The planting work controller 500 includes a CPU (Central Processing Unit) that executes various arithmetic processes and controls, a ROM (Read Memory) that stores control programs and various data, and a RAM that temporarily stores control programs and various data. (Random Access Memory) including a storage device 501, an input interface, and the like.

On the input side of the planting work controller 500, an item setting unit 502 for selecting and setting various seedling planting conditions, a hydraulic sensitivity setting unit 503 for setting a reference float angle, and a lift sensor 325 for detecting the float angle. A lift position sensor 504 configured by a sensor such as a potentiometer attached to a rotating portion of the lower link 20 or the top link 21 (see FIG. 1) to detect the position of the seedling planting device 23, traveling from the mission case 6 A vehicle speed sensor 505 for detecting the output, a float position sensor 178 for detecting the position of the float 32, a seedling extraction plate sensor 190 for detecting the position of the seedling extraction plate 131, a surface detection sensor 344 for detecting the position of the surface detector 341, and spraying A spray amount sensor 438 for detecting the position of the spray amount adjusting member 433 of the amount adjusting mechanism 430; 0 box application agent sprayer mounting sensor 506 for detecting the attachment to the seedling planting apparatus 23 are electrically connected.

On the output side of the planting work controller 500, a motor drive circuit unit of a planting depth adjustment motor 174 that adjusts the position of the float switching 32 and the lift switching electromagnetic valve 99 and the electromagnetic opening / closing valve 101 that control the expansion and contraction movement of the lifting cylinder 39. 511, a motor drive circuit unit 512 of the seedling adjustment motor 184 that adjusts the position of the seedling extraction plate 131, a motor drive circuit unit 513 of the application amount adjustment motor 437 that adjusts the application amount of the box application agent, and the operation operation unit 13 A liquid crystal panel 522 (display unit) for displaying various setting items and the like is electrically connected to the display panel 521 in FIG. FIG. 33 is a schematic functional block diagram, and although not shown, the planting work controller 500 is electrically connected to various sensors, a driving device, and the like.

As shown in FIG. 5, in the driving operation unit 13, the hydraulic sensitivity setting device 503 is arranged in the right rear part of the driving operation unit 13, and the item setting device 502 is arranged in the vicinity of the left front of the steering wheel shaft of the steering handle 14. Has been. The hydraulic sensitivity setting device 503 is composed of a switch such as a rotary encoder. The item setting unit 502 includes a switch such as a rotary encoder with a push switch. When the item setter 502 is operated to rotate in either the left or right direction, various setting items are sequentially displayed on the liquid crystal panel 522 of the display panel 521 each time the item setter 502 is rotated as shown in FIG. In FIG. 34, only some of the various setting items of the rice transplanter 1 are illustrated.

When the item setting unit 502 is pressed while the target item selection screen 523 is displayed on the liquid crystal panel 522, the setting item setting screen 524 is displayed, and the selected item can be selected by rotating the knob of the item setting unit 502. Can be adjusted and changed. When the item setting unit 502 is pressed and operated while the setting screen 524 is displayed, the condition of the selected item is determined and the item selection screen 523 is displayed. In this embodiment, the item setting device 502 selects a seedling planting mode (seedling mode), adjusts the seedling planting depth (planting depth), adjusts the seedling vertical harvesting amount (seedling harvesting amount), and a box. Adjustment of application agent application amount (box application) is performed. Here, the setting item of the box application agent spread amount (box application) is a box application agent spreader mounting sensor 506 (see FIG. 5) that detects the mounting of the box application agent spreader 400 (see FIG. 21) on the seedling planting device 23. 33) may be displayed when the mounting of the box application agent spreader 400 is detected.

Note that the selection and setting of these items are not limited to the configuration performed by the item selector 502. For example, the selection of the dense seedling mode and the standard mode may be switched by a changeover switch or may be switched every time a push button type switch for mode selection is pressed. Further, the planting depth adjustment, the seedling vertical amount adjustment, and the box application agent application amount adjustment may each be set with a rotary encoder type setting device.

Referring to FIG. 35, an embodiment of setting seedling planting conditions and seedling planting control will be described. The rice transplanter 1 can select a standard mode corresponding to a seedling mat of standard type seedlings and a dense seedling mode corresponding to a seedling mat of high density seedlings in which seedlings are grown at a higher density than the seedling mat of standard type seedlings It is configured. The planting work controller 500 stores a control program for the standard mode and a control program for the dense seedling mode in the storage device 501. An outlet cover 226a for high density seedling, a planting claw 30a and an extruding piece 234a are attached when a seedling mat for high density seedling is used, and an outlet cover 226b for standard type seedling for planting when a seedling mat for standard type seedling is used. The nail | claw 30b and the extrusion piece 234b are mounted | worn (refer FIG.30 and FIG.31).

When the dense seedling mode is selected on the item selection screen 523 (see FIG. 34) of the seedling mode by the operation of the item selector 502 (step S1: Yes), the control program for the dense seedling mode is read (step S2). In the dense seedling mode, in the item selection screen 523 and the setting screen 524 of the seedling amount (seedling vertical amount), the adjustable range of the seedling vertical amount is limited to a predetermined range on the lower limit side (step S3). That is, when the seedling mat for high-density seedlings is planted, the range in which the seedling adjustment member 137 can be displaced by the seedling adjustment actuator mechanism 181 (see FIG. 17) is more electrically compared to when the seedling mat for standard type seedlings is planted. Limiting in terms of control, the adjustable range of the seedling vertical harvest is limited to a predetermined range on the lower limit side. In this embodiment, in the standard mode, the adjustable range of the vertical seedling amount is 8 to 17 mm (one scale is 1 mm and 10 scales), while in the dense seedling mode, as shown in FIG. The adjustable range 525 is limited to 8 to 13 mm (six divisions on the lower limit side). If the operator has selected the dense seedling mode during the rice planting operation using the seedling mat of high-density seedlings, even if you forget the setting of the seedling vertical harvesting amount, the seedling vertical harvesting amount can be suppressed to 13 mm or less, It is possible to prevent the wasteful consumption of seedlings due to an excessive increase in the number of seedlings per strain and to perform appropriate rice planting work, and to reduce the burden on the operator for setting the amount of seedlings to be collected.

Further, as described above, the seedling vertical feed amount by intermittent driving of the seedling vertical feed belt 155 (see FIGS. 9 and 12) is determined through the interlocking wire 156 and the seedling taking interlocking cam 138 (see FIG. 8) and the driven cam 153. As a result of the connection, the seedling vertical feed amount also changes corresponding to the change in the seedling vertical collection amount. Therefore, when using a seedling mat for high-density seedlings, if the seedling vertical feed amount is set lower than when using a seedling mat for standard type seedlings, the vertical feed amount of seedlings will also be reduced, depending on the vertical seedling amount. Proper seedling vertical feeding is performed. As a result, when using seedling mats for high-density seedlings, the consumption speed of seedling mats can be reduced compared to when using standard seedling seedling mats, and the number of seedling mats required for rice planting work per unit area is reduced. In addition, the number of times the seedling mat 29 is replenished with the seedling mat can be reduced to reduce the time required for seedling planting work and to reduce the labor of the operator and work assistant.

Subsequently, the planting depth control during seedling planting work in the dense seedling mode will be described. When the dense seedling mode is selected, the lifting control of the hydraulic cylinder 39 (hydraulic lifting control mechanism) is corrected so that the seedling planting depth is deeper than when the standard mode is selected. When the seedling planting device 23 is lowered by the operation of the work lever 16 and the seedling planting work is started (step S4: Yes), the lifting cylinder 39 is moved downward by the operation of the lifting switching electromagnetic valve 99 and the electromagnetic switching valve 101. Driven. The seedling planting device 23 is moved by the lift cylinder 39 until the lift sensor value V of the lift sensor 325 matches the target value V1 which is the hydraulic sensitivity (target tilt angle of the center float 32a) (the tilt angle of the center float 32a is constant). Then, the raising / lowering control of the seedling planting device 23 is performed so that the target planting depth is maintained constant (V = V1).

During the seedling planting operation, the hydraulic pressure sensitivity setting value of the hydraulic pressure sensitivity setting unit 502, the vertical movement sensor value V of the vertical movement sensor 325, and the vehicle speed sensor value of the vehicle speed sensor are read (step S5: Yes). The hydraulic pressure sensitivity (sensitivity) of the hydraulic cylinder 39 is corrected to the insensitive side (the side where the front portion of the float 32a is raised) with respect to the set value (step S6), and based on the lift sensor value, the corrected sensitivity value, and the vehicle speed sensor value. Thus, the target value V1 that is the hydraulic pressure sensitivity is calculated (step S7). Here, as the traveling speed of the traveling machine body 2 increases, the float 32 tends to move forward and the amount of settlement of the float 32 increases. On the other hand, as the traveling speed of the traveling machine body 2 decreases, the float 32 tends to move forward. As a result, the amount of settlement of the float 32 decreases, so that the target value V1 is calculated in step S6 so that the seedling planting depth is constant according to the vehicle speed sensor value.

The raising / lowering control of the seedling planting device 23 is performed so that the raising / lowering sensor value V matches the target value V1 (step S8). When the elevation sensor value V matches the target value V1, the raising and lowering of the seedling planting device 23 is stopped without operating the hydraulic cylinder 39. When the elevation sensor value V is smaller than the target value V1, the solenoid valve 101 is connected to the open position 101a, the elevation switching valve 99 is connected to the discharge position 99b, and the elevation cylinder 39 is contracted to raise and lower the sensor value V. And the seedling planting device 23 are lowered so that the target value V1 matches. When the lift sensor value V is larger than the target value V1, the solenoid on-off valve 101 is connected to the open position 101a and the lift switching valve 99 is connected to the supply position 99a so that the lift sensor value V and the target value V1 coincide. The seedling planting device 23 is raised.

On the other hand, when the standard mode is selected on the seedling mode item selection screen 523 (see FIG. 34) (step S1: No), the control program for the standard mode is read (step S11). In the standard mode, in the item selection screen 523 and the setting screen 524 of the seedling collection amount (seedling vertical collection amount), the adjustable range of the seedling vertical collection amount is not limited electrically, but 8 to 17 mm (1 scale 1 mm) 10 scales).

Subsequently, when the seedling planting operation is started in the standard mode and the seedling planting operation is in progress (step S12: Yes), the hydraulic pressure sensitivity setting value of the hydraulic pressure sensitivity setting unit 502 and the vertical movement sensor value V of the vertical movement sensor 325 A vehicle speed sensor value of the vehicle speed sensor 505 is read (step S13: Yes), and a target value V1 that is a hydraulic pressure sensitivity is calculated (step S14). Here, in the standard mode, the hydraulic pressure sensitivity setting value is not corrected as in step S6 in the dense seedling mode. And the seedling planting apparatus 23 is controlled so that the raising / lowering sensor value V and target value V1 correspond (step S15).

In this embodiment, when the dense seedling mode is selected, the hydraulic sensitivity of the hydraulic cylinder 39 is corrected to the insensitive side with respect to the hydraulic sensitivity setting value of the hydraulic sensitivity setting device 502 as in step S3 above, and compared with when the standard mode is selected. Thus, the raising / lowering control of the hydraulic cylinder 39 (hydraulic raising / lowering control mechanism) is corrected so that the seedling planting depth becomes deeper. In a rice planting operation using a seedling mat of high-density seedling, the area where the planting claw 30 scrapes off the seedling mat is smaller than when a seedling mat of standard type seedling is used, so that the seedling planted in the field is likely to float. Therefore, when the dense seedling mode corresponding to the seedling mat for high density seedling is selected, the hydraulic cylinder 39 is moved up and down so that the seedling planting depth is deeper than when the standard mode corresponding to the standard seedling mat is selected. By correcting the control automatically, floating seedlings can be prevented, and the burden on the operator regarding the seedling planting depth setting can be reduced.

Further, in steps S7 and S14, the target value V1 of the hydraulic sensitivity is corrected using the sensor value of the surface detection sensor 334 so that the amount of subsidence of the center float 32a becomes a constant value, so that the seedling planting depth is It may be made constant. The amount of settlement of the center float 32a is calculated from the sensor value of the surface detection sensor 334 that detects the actual height of the field surface, and the target value V1 of the hydraulic sensitivity is set to the insensitive side (the front part of the float 32a) so that the amount of settlement is constant. To the sensitive side (the side where the front part of the float 32a descends). Here, when the dense seedling mode is selected, the target value V1 of the hydraulic pressure sensitivity is calculated and corrected using the corrected sensitivity value obtained by correcting the hydraulic pressure sensitivity setting value to the insensitive side in step S6.

36, another embodiment of setting seedling planting conditions and seedling planting control will be described. In this embodiment, in place of step S6 (during dense seedling mode selection) of the embodiment described with reference to FIG. 35, the position of the float 32 is corrected so that the seedling planting depth becomes deeper. -1. In step S 3-1, the planting depth setting value is corrected so that the seedling planting depth becomes deeper than the planting depth setting value (see FIG. 34) set by the operation of the item selector 502. In this embodiment, the planting depth adjusting motor 174 (see FIG. 15) is driven to rotate the planting depth adjusting member 122 forward by the correction amount to correct the position of the float 32 to the planting depth adjusting shaft 121 side. . As a result, the amount of nail protrusion (the distance between the tip of the planting claw 30 and the bottom surface of the float 32) of the planting claw 30 during the seedling planting operation increases, and the planting depth of the seedling increases. In this manner, in the dense seedling mode using the seedling mat for high-density seedling raising, the planting claw 30 scrapes the seedling mat by automatically correcting the position of the float 32 so as to increase the seedling planting depth. Even if the area is small, floating seedlings can be prevented, and the burden on the operator regarding the planting depth setting can be reduced.

Referring to FIG. 37, an embodiment of box application agent spraying control will be described. This embodiment includes step S3-2 for correcting the box application agent application amount when the dense seedling mode is selected. The box application agent spray amount of the box application agent spreader 400 (see FIGS. 20 to 23) is a set value (see FIG. 34) of the box application agent spray amount (box application) set by the operation of the item selector 502. Alternatively, it is set by rotating the spread amount adjustment dial 431 (see FIG. 23). When the dense seedling mode is selected, the drug application amount setting value is corrected so that the drug application amount is larger than the drug application amount setting value (step S3-2). In this embodiment, the spread rate adjusting motor 437 (see FIG. 23) is driven to move the spread rate adjusting member 433 away from the regulation pin 425 (backward and upward direction) by a correction amount to drive the spread rate adjusting member. The positions of 433 and the stopper member 434 are corrected.

Since seedlings are densely grown in high-density seedling seedling mats, sufficient seedling insecticide and sterilization cannot be achieved if the amount of box application agent is the same as when using standard seedling seedling mats. Therefore, when using a seedling mat for high-density seedling (when dense seedling mode is selected), the amount of box application agent can be set automatically to increase the amount of seedling in the seedling mat for high-density seedling. Thus, the healthy growth of the seedlings planted in the field can be realized, and the burden on the operator regarding the setting of the application amount of the box application agent can be reduced.

As described above, the rice transplanter 1 according to the embodiment described above includes the seedling planting device 23 that scrapes seedlings from the seedling mat placed on the seedling placing stand 29 with the planting claws 30 and plants the seedlings on the field. The standard mode has a larger scraping amount corresponding to the seedling mat for standard seedlings, and the scraping amount corresponding to the seedling mat for higher density seedlings where seedlings are grown at a higher density than the seedling mat for standard seedlings. Since the dense seedling mode is selectable, it is possible to simplify the setting of the rice transplanter when using a seedling mat for high-density seedling and reduce the burden on the operator.

Moreover, the rice transplanter 1 of the said embodiment is the hydraulic cylinder 39 (which raises / lowers the seedling planting apparatus 23 based on the detected value of the raising / lowering sensor 325 which detects the inclination angle of the float 32a which adjusts the planting depth of a seedling. (Elevation control mechanism), and when the dense seedling mode is selected, the planting depth of the seedling is deeper than when the standard mode is selected. In rice planting work, the planting claw 30 has a small area for scraping the seedling mat, so the seedling planted on the field is likely to float, but the elevation control of the hydraulic cylinder 39 is automatically corrected to deepen the seedling planting depth. By doing so, floating seedlings can be prevented, and the burden on the operator regarding the seedling planting depth setting can be reduced.

Moreover, the rice transplanter 1 of the said embodiment is the structure which can adjust the amount of seedling vertical picking of the planting nail | claw 30 by position adjustment of the seedling extraction board 131 arrange | positioned under the seedling mounting stand 29, Comprising: Dense seedling mode At the time of selection, since the adjustable range of the seedling vertical harvest amount is limited to a predetermined range on the lower limit side, when the operator has selected the dense seedling mode in the rice planting work using the seedling mat of the high density raising seedling, Even if you forget the setting of the vertical seedling amount, the vertical seedling amount can be kept within the predetermined range on the lower limit side, so that the number of seedlings per strain is excessively increased and wasteful seedling consumption is prevented. Therefore, it is possible to perform an appropriate rice planting operation and reduce the burden on the operator regarding the setting of the vertical seedling amount.

Moreover, the rice transplanter 1 of the said embodiment is the structure provided with the box application agent spreader 400 (drug spreader) which spreads a chemical | medical agent to the seedling mat mounted in the seedling stand 29, Comprising: In dense seedling mode At the time of selection, since it is configured to increase the amount of medicine sprayed by the box application agent spreader 400 as compared to the case of selecting the standard mode, the operator can use the dense seedling at the time of rice planting work using a seedling mat of high-density seedling raising. If the mode is selected, the application amount of the box application agent is automatically set to a large amount, so that sufficient seedling can be killed and sterilized in the seedling mat for high-density seedling raising, and the healthy growth of the seedlings planted in the field And the burden on the operator regarding the setting of the box application agent application amount can be reduced.

In addition, the rice transplanter 1 of the above embodiment has a seedling planting device 23 that scrapes seedlings from a seedling mat placed on the seedling platform 29 with a planting claw 30 and plantes them in a field, and a seedling planting depth. In a rice transplanter equipped with a hydraulic cylinder 39 (elevation control mechanism) that controls the raising / lowering of the seedling planting device 23 based on the detection value of the elevation sensor 325 that detects the inclination angle of the float 32a to be adjusted, At the time of planting, the planting depth of seedlings is deeper than when planting a seedling mat of standard type seedlings where seedlings were grown at a lower density than a seedling mat of high-density seedlings, Even if the area where the planting claw 30 scrapes off the seedling mat is small in the rice planting operation using the seedling mat of high-density seedling raising, the floating seedling can be prevented.

Further, the rice transplanter 1 of the above embodiment corrects the hydraulic sensitivity (sensitivity) of the hydraulic cylinder 39 (elevation control mechanism) to the insensitive side when planting a seedling mat of high-density seedling so that the planting depth of the seedling is increased. Since it is configured to be deep, planting of seedlings can be performed simply by correcting the hydraulic sensitivity of the hydraulic cylinder 39 when planting a seedling mat of high-density seedling without providing a separate member for increasing the planting depth. Deepening depth can prevent floating seedlings.

Moreover, the rice transplanter 1 of the said embodiment is the structure by which the float 32 is position-adjusted with the displacement of the planting depth adjustment member 122 position-adjusted by the planting depth adjustment actuator mechanism 171, Comprising: When planting the seedling mat, the position of the float 32 is corrected to the ascending side so that the planting depth of the seedling is increased, so that a member for increasing the planting depth is not provided separately. By simply correcting the position of the float 32 at the time of planting a seedling mat for density raising seedlings, it is possible to easily increase the seedling planting depth and prevent floating seedlings.

Further, the rice transplanter 1 of the above-described embodiment is placed on the seedling placement table 29 and the seedling planting device 23 for scraping seedlings from the seedling mat placed on the seedling placement platform 29 with the planting claws 30 and planting them on the field. In a rice transplanter equipped with a box application spreader 400 (drug spreader) that spreads the drug on the planted mat, the density of the seedling is lower when planting the seedling mat of high-density seedling and than the seedling mat of high-density seedling It is configured so that the amount of chemical spraying of the box application agent spreader 400 is changed at the time of planting the seedling mat of the standard type seedling grown on the plant. Different amounts of chemicals can be sprayed at the time of planting the seedling mats for the type seedlings, and an appropriate amount of chemicals can be applied to the seedling mats according to the seedling mats for the high-density seedlings and the seedling mats for the standard type seedlings.

Moreover, the rice transplanter 1 of the said embodiment is the time of planting of the seedling mat of a high-density seedling compared with the time of planting the seedling mat of a standard type seedling, and the chemical spraying of the box application agent sprayer 400 (drug sprayer). Since it is configured so as to increase the amount, it is possible to kill and sterilize enough seedlings in the seedling mat with high density seedling during the rice planting work using the seedling mat with high density seedling, and the seedlings planted in the field Healthy growth can be achieved.

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.

1 Rice transplanter 23 Seedling planting device 29 Seedling stand 30 Planting claw 32a Center float (float)
39 Hydraulic cylinder (lift control mechanism)
122 Planting depth adjusting member 131 Seedling extraction plate 171 Planting depth adjusting actuator mechanism 325 Lift sensor

Claims (3)

1. A seedling planting device that scrapes seedlings from a seedling mat placed on a seedling stand with planting claws and plantes them in the field, and a detection value of a lift sensor that detects the inclination angle of the float that adjusts the seedling planting depth In a rice transplanter equipped with an elevation control mechanism for raising and lowering the seedling planting device based on
   When planting a seed mat for high-density seedlings, the planting depth of seedlings becomes deeper than when planting a seed mat for standard seedlings in which seedlings are grown at a lower density than the seed mats for high-density seedlings. Configured as
   Rice transplanter.
2. At the time of planting the seedling mat of the high-density seedling, the sensitivity of the elevation control mechanism is corrected to the insensitive side, and the planting depth of the seedling is configured to be deep,
   The rice transplanter according to claim 1.
3. The float is adjusted in position in accordance with the displacement of the planting depth adjusting member that is positioned by the planting depth adjusting actuator mechanism,
   At the time of planting the seedling mat of the high-density seedling, it is configured so that the planting depth of the seedling is deepened by correcting the position of the float to the rising side.
   The rice transplanter according to claim 1.

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