Riding-type seedling transplanter

Abstract

There is a paddy field work machine equipped with a powder and granular material supply device that includes a blower located above the rear step to generate a conveying airflow and a guide section to guide the powder and granular material conveyed by the airflow. The conveying airflow generated by the blower is set to be large and constant in order to convey a predetermined amount of powder and granular material, resulting in high power consumption and noise problems. Therefore, we provide a riding-type seedling transplanter equipped with a fertilizer application device that reduces power consumption and quiets down, thereby improving comfort. [Solution] In a riding-type seedling transplanter equipped with a seedling planting device 3 and a fertilizer application device 4 that transports fertilizer dispensed from a fertilizer tank 67 by a fertilizer dispensing unit 68 to the field via a fertilizer application hose 62 using a blower 69 for application, the rotation speed of the blower 69 is controlled according to the set amount of fertilizer applied by adjusting the amount dispensed by the fertilizer dispensing unit 68.

Description

Technical Field

[0001] The present invention relates to a riding type seedling transplanter equipped with a fertilizer application device.

Background Art

[0002] There is a paddy field working machine equipped with a granular material supply device having a blower that generates a conveying wind and is located above the rear step portion and a guide portion that guides the granular material conveyed by the conveying wind (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The conveying wind generated by the blower is set to be large and constant to convey a predetermined granular material, resulting in high power consumption and noise problems.

[0005] The present invention has been made in view of the above, and an object thereof is to provide a riding type seedling transplanter equipped with a fertilizer application device that reduces power consumption and improves comfort by making the noise quieter.

Means for Solving the Problems

[0006] The invention according to claim 1 is a riding type seedling transplanter equipped with a fertilizer application device 4 that mounts a seedling planting device 3 on a traveling vehicle body 1 and conveys and applies fertilizer fed from a fertilizer tank 67 by a fertilizer feeding section 68 through a fertilizer hose 62 toward a field by a blower 69. In this riding type seedling transplanter, the rotational speed of the blower 69 is controlled according to the fertilizer application amount set by adjusting the feeding amount of the fertilizer feeding section 68.

[0007] According to the invention described in claim 1, by controlling the rotation speed of the blower 69 according to the set amount of fertilizer applied, power consumption can be reduced and the noise level can be lowered, thereby improving comfort.

[0008] The invention described in claim 2 is a ride-on seedling transplanter equipped with a seedling planting device 3 and a fertilizer application device 4 that transports fertilizer dispensed from a fertilizer tank 67 by a fertilizer dispensing unit 68 to the field via a fertilizer application hose 62 using a blower 69 for application, wherein the rotation speed of the blower 69 is controlled by the specific gravity of the fertilizer set in the setting unit 18a.

[0009] According to the invention described in claim 2, by controlling the rotation speed of the blower 69 according to the specific gravity of the set fertilizer, power consumption can be reduced and comfort can be improved by making it quieter.

[0010] The invention described in claim 3 is a ride-on seedling transplanter equipped with a seedling planting device 3 and a fertilizer application device 4 that transports fertilizer dispensed from a fertilizer tank 67 by a fertilizer dispensing unit 68 to the field via a fertilizer application hose 62 using a blower 69 for application, wherein the rotation speed of the blower 69 is controlled by a trial dispensing amount set in a setting unit 18a.

[0011] According to the invention described in claim 3, by controlling the rotation speed of the blower 69 according to the set trial discharge amount, power consumption can be reduced and the noise level can be lowered, thereby improving comfort.

[0012] The invention described in claim 4 is a ride-on seedling transplanter according to any one of claims 1 to 3, wherein when the set amount of fertilizer applied is greater than or equal to a predetermined amount, when the set specific gravity of the fertilizer is greater than or equal to a predetermined amount, or when the set trial dispensing amount is greater than or equal to a predetermined amount, the clutch of the seedling planting device 3 is engaged and the seedling planting device 3 is operated, when the seedling planting device 3 is lowered so as to touch the field surface, or when the float 42 touches the field surface, the rotation speed of the blower 69 is operated at the normal high rotation speed, and when the clutch of the seedling planting device 3 is disengaged and the seedling planting device 3 is not operated, when the seedling planting device 3 is raised so as not to touch the field surface, or when the float 42 does not touch the field surface, the rotation speed of the blower 69 is reduced.

[0013] According to the invention described in claim 4, by controlling the rotation speed of the blower 69 to decrease when planting work is not being performed, power consumption can be reduced and comfort can be improved by making the operation quieter. [Brief explanation of the drawing]

[0014] [Figure 1] This is a side view of a riding-type rice transplanter according to an embodiment of the present invention. [Figure 2] This is a rear view of the fertilizer application device. [Figure 3] This is a plan view of a fertilizer application device. [Figure 4] This is a side view of a fertilizer application device. [Figure 5] This is a plan view for explaining the control panel. [Modes for carrying out the invention]

[0015] A riding-type rice transplanter equipped with a fertilizer application device, which is one embodiment of the riding-type seedling transplanter of this invention, will be described based on the drawings. <Overall Structure> As shown in Figure 1, the riding-type rice transplanter has a seedling planting device 3 attached to the vehicle body 1 by a lifting link device 2, and is also equipped with a fertilizer application device 4. The vehicle body 1 is a four-wheel drive vehicle having a pair of front wheels 6, 6 and rear wheels 7, 7 on each side, which are the drive wheels.

[0016] In this specification, the left and right sides are respectively referred to as the left side and the right side toward the forward direction of the riding rice transplanter, the forward direction is referred to as the front side, and the reverse direction is referred to as the rear side.

[0017] <Traveling vehicle body 1> As shown in FIG. 1, in the traveling vehicle body 1, a transmission case 11 and an engine 12 are disposed on main frames 10a and 10b, a hydraulic pump is integrally assembled with the transmission case 11 on the rear side surface of the transmission case 11, and a steering post 14 projects upward in front of the transmission case 11.

[0018] A steering handle 16 is provided at the upper end of the steering post 14, a shift lever 17 is provided on the right side of the steering handle 16, and a monitor 18a as a setting unit is provided on an operation panel 18 on the upper surface of the steering post 14.

[0019] A step floor 19 serving as a steering floor is attached to the upper part of the machine body, and a driver's seat 20 is installed above the engine 12.

[0020] The front wheels 6, 6 are pivotally supported by front wheel support cases 22, 22 provided on the side of the transmission case 11 so that the direction can be changed. The rear wheels 7, 7 are provided on rear wheel drive shafts 23 of rear wheel transmission cases 24, 24 attached to both left and right ends of the left and right frames 37. The left and right frames 37 are supported at the rear ends of the main frames 10a, 10b.

[0021] The rotational power of the engine 12 is transmitted to the input shaft 32a of the hydrostatic continuously variable transmission (HST) 31 via a pulley 27, a belt 28, and a pulley 29 in sequence, and is transmitted into the transmission case 11 from the output shaft 32b of the HST 31.

[0022] The rear ends of the left and right rear output shafts 11a protrude behind the transmission case 11, and the left and right rear wheel transmission shafts 35, 35, which transmit power to the rear wheel transmission cases 24, 24, are connected to these protruding ends. The left and right rear wheels 7, 7 are then driven and rotated by these left and right rear wheel transmission shafts 35, 35, respectively.

[0023] Then, driving force is transmitted from the transmission case 11 to the PTO transmission case located at the rear of the vehicle body 1 via the drive shaft, and from the PTO transmission case, driving force is transmitted to each fertilizer dispensing section 68 of the fertilizer application device 4 via the fertilizer application drive mechanism 40, and driving force is also transmitted to the seedling planting device 3 via the PTO transmission shaft 45.

[0024] Furthermore, a pedal located on the lower right side of the steering handle 16 at the front of the vehicle body 1 can operate both the main clutch and the left and right rear wheel brakes. When this pedal is pressed, the main clutch disengages, followed by the application of the left and right rear wheel brakes, bringing the vehicle to a stop.

[0025] Additionally, spare seedling trays 30 are provided on both the left and right sides of the front of the vehicle body 1.

[0026] <Seedling planting device 3> As shown in Figure 1, the seedling planting device 3 is mounted on the vehicle body 1 so as to be able to move up and down by a lifting link device 2.

[0027] The upper end of the piston of a general-purpose lift cylinder 36, whose base is rotatably mounted on the vehicle body 1, is connected to a lifting link device 2. Pressurized oil is supplied to and discharged from the lift cylinder 36 via a lifting valve using a hydraulic pump provided on the vehicle body 1, causing the piston of the lift cylinder 36 to extend and retract, thereby moving the seedling planting device 3 connected to the lifting link device 2 up and down.

[0028] The seedling planting device 3 consists of a planting transmission case 38, which also serves as a frame and is mounted to the rear of the lifting link device 2 so as to be able to roll; a seedling platform 39, which is supported by a support member provided on the planting transmission case 38 and reciprocates in the left-right direction of the machine; a seedling planting tool 41, which is mounted on the rear end of the planting transmission case 38 and plants seedlings one by one into the field from the lower end of the seedling platform 39; and a center (sensor) float 42 and side floats 43, which are ground leveling bodies, with their rear end pivotally supported at the bottom of the planting transmission case 38 and their front end able to swing up and down. The center float 42 and side floats 43 are provided to level the area in front of the field where seedlings will be planted by the seedling planting tool 41.

[0029] The PTO transmission shaft 45 has universal joints at both ends and is installed to transmit power from the transmission case 11 to the planting transmission case 38 of the seedling planting device 3. The lifting link sensor 51 is installed between the lifting link base frame 15, which is erected on the main frames 10a and 10b, and the vertically moving lifting parallel link members 2a and 2b of the lifting link device 2. It is a potentiometer that detects the movement of the lifting link device 2 and can detect when the seedling planting device 3 has been raised to its highest position by manual operation or the like.

[0030] Furthermore, the angle of attack sensor located at the front of the center float 42 detects the height of the seedling planting device 3 relative to the ground. Based on the value detected by the angle of attack sensor, the control device 70' controls the lift valve to control the vertical position of the seedling planting device 3 using the lift cylinder 36.

[0031] Specifically, when the angle of attack sensor detects that the front of the center float 42 has been lifted beyond the appropriate range by an external force, the hydraulic pump sends pressurized oil drawn from inside the transmission case 11 to the lift cylinder 36, causing the piston to protrude and the lifting link device 2 to move upward, raising the seedling planting device 3 to a predetermined position. Conversely, when the angle of attack sensor detects that the front of the center float 42 has been lowered below the appropriate range, the pressurized oil in the lift cylinder 36 is returned to the transmission case 11, causing the lifting link device 2 to move downward and lowering the seedling planting device 3 to a predetermined position.

[0032] When the front of the center float 42 is within the appropriate range (when the angle of attack sensor detects within the appropriate range and the seedling planting device 3 is at the correct ground height), the flow of pressurized oil in the lift cylinder 36 is stopped to hold the seedling planting device 3 in a fixed position.

[0033] In this way, the center float 42 is used as a grounding sensor for automatic height control of the seedling planting device 3.

[0034] <Fertilizer 4> As shown in Figures 1 to 4, the fertilizer applicator 4 dispenses a fixed amount of fertilizer from the fertilizer tank 67 downwards through each fertilizer dispensing unit 68. The dispensed fertilizer is then transported by the blower 69 of the electric blower through each fertilizer hose 62 to each fertilizer guide 80 located on the center float 42 and side float 43. The fertilizer is then dropped into fertilizer furrows formed near the sides of the seedling planting rows by a furrowing body 82 located in front of each fertilizer guide 80, thereby applying granular fertilizer to the field.

[0035] The fertilizer tank 67 is shared by all rows and has an openable / closable lid 67a attached to its top. The lower part of the fertilizer tank 67 branches into funnel shapes corresponding to the number of fertilizer rows, and the lower part of these branches is connected to the upper end of each dispensing section 68. The fertilizer tank 67 is attached to two pivot arms 64 on the left and right, which are supported by a fertilizer applicator-side frame 63 that is long in the left-right direction and fixed to the upper ends of the left and right lifting link base frames 15, 15. The lower end of these pivot arms 64 can be pivoted backward using the pivot point to separate it from each dispensing section 68. The pivot arms 64 are positioned from the outside between the first and second dispensing sections (two are provided in symmetrical positions). In the normal position where the lower part of the fertilizer tank 67 is connected to the upper end of each fertilizer dispensing section 68, the fertilizer tank 67 is fixed in place by a locking device.

[0036] The fertilizer dispensing drive mechanism 40, which transmits driving force from the PTO transmission case to each fertilizer dispensing unit 68 of the fertilizer dispenser 4, is composed of a conventionally known connecting rod and a rotating arm, and the amount of fertilizer dispensed by each fertilizer dispensing unit 68 is adjusted by changing the rotational speed per unit time of the dispensing drive shaft 68a of each fertilizer dispensing unit 68 by moving the pivot point of the rotating arm with a dispensing amount adjustment motor 47.

[0037] As shown in Figure 5, the monitor 18a of the control panel 18 has a screen that displays the amount of fertilizer to be applied, the specific gravity of the fertilizer, and the trial dispensing amount.

[0038] When the fertilizer application amount is set on the monitor 18a, the control device 70' operates the dispensing amount adjustment motor 47 to adjust the rotation speed per unit time of the dispensing drive shaft 68a of the fertilizer dispensing unit 68 so that the set fertilizer application amount is achieved.

[0039] When inputting the specific gravity of fertilizer, set the specific gravity using the monitor 18a.

[0040] When the test dispensing amount is set on the monitor 18a, the control device 70' rotates the fertilizer dispensing unit 68 a predetermined number of times to perform a test dispensing, measures the weight of the dispensed fertilizer, inputs this weight into the control device 70', and calculates the specific gravity of the fertilizer using a predetermined calculation formula.

[0041] Furthermore, the fertilizer application power transmitted to the dispensing drive shaft 68a is transmitted to the dispensing shaft of each row via a fertilizer ridge clutch provided for each row, through a pair of dispensing transmission gears 50.

[0042] Each dispensing unit 68 is a dispensing roll with groove-shaped recesses formed on its outer circumference that dispenses fertilizer from the fertilizer tank 67 downwards. When it rotates, the fertilizer that is dropped and supplied from the fertilizer tank 67 is contained in the recesses and dispensed downwards, and discharged from the discharge port at the lower end.

[0043] Each dispensing unit 68 has a discharge port connected to a connecting pipe 70 that communicates in the front-to-back direction. A fertilizer hose 62 is connected to the rear end of this connecting pipe 70. The lower end of the fertilizer device side frame 63 engages with the spiral groove on the outer circumference of the fertilizer hose 62, making it difficult for the fertilizer hose 62 to come off the connecting pipe 70.

[0044] Meanwhile, the front end of each connecting pipe 70 is inserted and connected to the rear part of the air chamber 61. The left end of the air chamber 61 is connected to a blower 69 via an air switching pipe 71, and air from the blower 69 is blown from the connecting pipe 70 into the fertilizer hose 62 via the air chamber 61.

[0045] Furthermore, a fertilizer discharge port is formed on the rear of each dispensing unit 68 for removing fertilizer from the fertilizer tank 67. The fertilizer discharge port of each dispensing unit 68 is connected to a fertilizer recovery pipe 65 that is long in the left-right direction and located behind each dispensing unit 68.

[0046] Each dispensing unit 68 is equipped with a discharge shutter at its fertilizer discharge port. During fertilization, the discharge shutters are closed, and the granular fertilizer in the fertilizer tank 67 is supplied by dropping into each dispensing unit 68. When discharging fertilizer, the discharge shutters are opened, and the granular fertilizer in the fertilizer tank 67 falls from the fertilizer discharge port into the fertilizer recovery pipe 65.

[0047] The left end of the fertilizer recovery pipe 65 is connected to the blower 69 via the air switching pipe 71. The air switching pipe 71 is a bifurcated pipe, with the air chamber 61 connected to one end and the fertilizer recovery pipe 65 connected to the other. The air switching pipe 71 is equipped with an air switching shutter 72, which acts as an air switching section, allowing it to switch between supplying air blown from the blower 69 to the air chamber 61 side and supplying air to the fertilizer recovery pipe 65 side. The air switching shutter 72 is located in the front-to-back center between the air chamber 61 and the fertilizer recovery pipe 65, ensuring a stable air supply to both. The right end of the fertilizer recovery pipe 65 is a fertilizer recovery port 66.

[0048] A fertilizer recovery lever 48 is provided near the fertilizer recovery port 66 at the right end of the fertilizer applicator 4, and is rotatably positioned to move between the fertilizer applicator and the fertilizer discharge position.

[0049] The fertilizer recovery lever 48 is connected to each of the discharge shutters and the air switching shutter 72 via an operating connecting member. When the fertilizer recovery lever 48 is rotated to the fertilizer discharge position, the air switching shutter 72 is switched, allowing air from the blower 69 to be supplied to the fertilizer recovery pipe 65, and each of the discharge shutters 116 opens, causing the fertilizer in the fertilizer tank 67 to be discharged into the fertilizer recovery pipe 65. The granular fertilizer is then transported in the fertilizer recovery pipe 65 by the air from the blower 69 and discharged from the fertilizer recovery port 66. At this time, since the fertilizer recovery lever 48 is located near the fertilizer recovery port 66 at the right end of the fertilizer application device 4, a fertilizer recovery container or fertilizer recovery bag can be placed below the fertilizer recovery port 66, allowing for efficient and proper fertilizer recovery while monitoring the fertilizer recovery status.

[0050] Then, when the fertilizer collection lever 48 is rotated to the fertilization position, each discharge shutter 116 is closed, and the air switching shutter 72 is switched, so that air from the blower 69 is blown through the air chamber 61 and into the fertilizer hose 62 from the connecting pipe 70, creating a fertilization state.

[0051] In particular, in this embodiment, in order to reduce the power consumption of the fertilizer application device 4 and improve comfort by making it quieter, the control device 70' controls the operation of the blower 69 as follows.

[0052] In other words, when the amount of fertilizer applied set on the monitor 18a of the control panel 18 is equal to or greater than the set amount (for example, 40 kg / 10a or more), the blower 69 operates at its normal high rotation speed. When the amount of fertilizer applied set on the monitor 18a is less than the set amount (for example, less than 40 kg / 10a), the blower 69 is conveying less fertilizer, so the rotation speed of the blower 69 is reduced.

[0053] By controlling the rotation speed of the blower 69 according to the fertilizer application rate set on monitor 18a, power consumption can be reduced and noise can be quieted, thereby improving comfort.

[0054] In a second embodiment, when the specific gravity of the fertilizer set on the monitor 18a of the operation panel 18 is above a predetermined value (for example, 0.92 or higher), the blower 69 is operated at its normal high rotation speed. When the specific gravity set on the monitor 18a is below a predetermined value (for example, less than 0.92), the blower 69 is operated at a lower rotation speed because the fertilizer being transported by the blower 69 is lighter.

[0055] By controlling the rotation speed of the blower 69 based on the specific gravity of the fertilizer set on monitor 18a, power consumption can be reduced and noise can be quieted, thereby improving comfort.

[0056] Furthermore, in a third embodiment, when the trial dispensing amount set on the monitor 18a of the operation panel 18 is greater than or equal to a predetermined amount (for example, 184g or more), the blower 69 is operated at its normal high rotation speed, and when the trial dispensing amount set on the monitor 18a is less than a predetermined amount (for example, less than 184g), the rotation speed of the blower 69 is reduced.

[0057] By controlling the rotation speed of the fan 69 based on the trial discharge amount set on monitor 18a, power consumption can be reduced and noise can be reduced, thereby improving comfort.

[0058] Furthermore, in a fourth embodiment, if the amount of fertilizer applied set on the monitor 18a of the operation panel 18 is greater than or equal to a predetermined amount (for example, 40 kg / 10a or more), if the specific gravity of the fertilizer set on the monitor 18a is greater than or equal to a predetermined amount (for example, 0.92 or more), or if the trial dispensing amount set on the monitor 18a is greater than or equal to a predetermined amount (for example, 184 g or more), when the clutch of the seedling planting device 3 is engaged and the seedling planting device 3 is in operation, when the seedling planting device 3 is lowered to touch the field surface, or when the center (sensor) float 42 touches the field surface, the blower 69 is operated at its normal high rotation speed. When the clutch of the seedling planting device 3 is disengaged and the seedling planting device 3 is not in operation, when the seedling planting device 3 is raised so as not to touch the field surface, or when the center (sensor) float 42 does not touch the field surface, the blower 69 is reduced in rotation speed.

[0059] By controlling the rotation speed of the blower 69 to a lower level when planting work is not being performed, power consumption can be reduced and the noise level can be lowered, improving comfort.

[0060] Furthermore, in a fifth embodiment, when the product of the fertilizer application amount and specific gravity set on the monitor 18a of the operation panel 18 is greater than or equal to a predetermined value, the blower 69 is operated at its normal high rotation speed, and when the product of the fertilizer application amount and specific gravity set on the monitor 18a is less than the predetermined value, the rotation speed of the blower 69 is reduced.

[0061] Furthermore, in the sixth embodiment, when the product of the fertilizer application amount and the trial discharge amount set on the monitor 18a of the operation panel 18 is greater than or equal to a predetermined value, the blower 69 is operated at its normal high rotation speed, and when the product of the fertilizer application amount and the trial discharge amount set on the monitor 18a is less than the predetermined value, the rotation speed of the blower 69 is reduced.

[0062] Alternatively, the rotational speed of the blower 69 may be controlled by detecting the position of the pivot point of the rotating arm, which is controlled by the feed rate adjustment motor 47, using a potentiometer to determine the set fertilizer application amount.

[0063] Furthermore, when the fertilizer recovery lever 48 is rotated to the fertilizer discharge position, a fertilizer recovery lever position detection sensor, which consists of a potentiometer installed on the pivot point of the fertilizer recovery lever 48, detects that the fertilizer recovery lever 48 has reached the fertilizer discharge position. The control device 70' then operates the blower 69 at a high rotational speed, regardless of the state in which the blower 69's rotational speed is controlled, in order to shorten the fertilizer discharge time.

[0064] Furthermore, when operating the blower 69 at a high rotational speed, if the engine 12 is above a predetermined rotational speed, the engine 12 will operate at the rotational speed required by the worker without changing the current rotational speed. If the engine 12 is below a predetermined rotational speed, the electric accelerator will be used to increase the rotational speed of the engine 12 to above the predetermined speed to prevent battery drain.

[0065] Furthermore, when the battery charge level falls below a predetermined value, the control of the blower 69 to operate at a high rotation speed is restricted to prevent battery drain, and an error message indicating that the battery charge level is below a predetermined value is displayed on the monitor 18a of the control panel 18 (or the monitor of the remote control in the case of an autonomous fully automatic rice transplanter or a remotely operated rice transplanter).

[0066] Furthermore, in the case of fully automated autonomous rice transplanters, it would be even better if the machine were controlled to stop when the battery charge level falls below a predetermined value, allowing the operator to be aware of its status. [Explanation of Symbols]

[0067] 1. Running vehicle 3 Seedling planting device 4 Fertilizer application equipment 18a Settings section (monitor) 42 Floats (Center Float) 62 Fertilizer hose 67 Fertilizer tanks 68 Fertilizer feeding section 69 Blower

Claims

1. A riding-type seedling transplanter is equipped with a seedling planting device (3) and a fertilizer application device (4) on a traveling vehicle body (1) that transports fertilizer dispensed from a fertilizer tank (67) by a fertilizer dispensing unit (68) to the field via a fertilizer application hose (62) using a blower (69) for application, characterized in that the rotation speed of the blower (69) is controlled according to the set amount of fertilizer applied by adjusting the amount dispensed by the fertilizer dispensing unit (68).

2. A ride-on seedling transplanter equipped with a seedling planting device (3) and a fertilizer application device (4) that delivers fertilizer dispensed from a fertilizer tank (67) by a fertilizer dispensing unit (68) to the field via a fertilizer application hose (62) using a blower (69), characterized in that the rotation speed of the blower (69) is controlled according to the specific gravity of the fertilizer set in the setting unit (18a).

3. A ride-on seedling transplanter equipped with a seedling planting device (3) and a fertilizer application device (4) that delivers fertilizer dispensed from a fertilizer tank (67) by a fertilizer dispensing unit (68) to the field via a fertilizer application hose (62) using a blower (69), characterized in that the rotation speed of the blower (69) is controlled by a trial dispensing amount set in a setting unit (18a).

4. A ride-on seedling transplanter according to any one of claims 1 to 3, characterized in that when the set amount of fertilizer applied is greater than or equal to a predetermined amount, when the set specific gravity of the fertilizer is greater than or equal to a predetermined amount, or when the set trial dispensing amount is greater than or equal to a predetermined amount, the clutch of the seedling planting device (3) is engaged and the seedling planting device (3) is operated, when the seedling planting device (3) is lowered to touch the field surface or when the float (42) touches the field surface, the rotation speed of the blower (69) is operated at the normal high rotation speed, and when the clutch of the seedling planting device (3) is disengaged and the seedling planting device (3) is not operated, when the seedling planting device (3) is raised so as not to touch the field surface or when the float (42) does not touch the field surface, the rotation speed of the blower (69) is reduced.

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