CN115666219A

CN115666219A - Paddy field working machine

Info

Publication number: CN115666219A
Application number: CN202180040838.1A
Authority: CN
Inventors: 田尾哲也
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2020-07-10
Filing date: 2021-06-07
Publication date: 2023-01-31
Also published as: KR20230036068A; WO2022009578A1; JP2022015943A; JP7442405B2

Abstract

In a paddy field working machine in which a working device is supported at the rear of a machine body, mud and water splashed rearward from the machine body are less likely to adhere to a height sensor. The disclosed device is provided with: a lifting mechanism capable of lifting and lowering the operation device relative to the machine body; a floating plate (9) which is supported at the lower part of the operation device in a lifting way and follows the ground (G) in a grounding way; and a height sensor (38) provided in the working device on the rear side of the front end (9 a) of the floating plate (9) in a side view. The disclosed device is provided with: and a link mechanism (39) which is connected so as to straddle the floating plate (9) and the height sensor (38) and transmits the lifting operation of the floating plate (9) relative to the working device to the height sensor (38) so that the height sensor (38) detects the working height (H2) from the floating plate (9) to the working device. The disclosed device is provided with: and a control unit that operates the lifting mechanism so that the working height (H2) reaches a set height (H1) based on the value detected by the height sensor (38).

Description

Paddy field working machine

Technical Field

The present invention relates to a structure for lifting and lowering an operation device at the rear of a machine body in a paddy field operation machine such as a riding rice transplanter or a riding direct seeder.

Background

In a riding type rice transplanter which is an example of a paddy field working machine, as disclosed in patent document 1, a floating plate which follows a field surface in a ground contact manner is supported at a lower portion of a working device so as to be able to rise and fall, a height sensor is attached to the working device, and a rod is connected so as to straddle the floating plate and the height sensor.

Thus, the working height from the floating plate (field surface) to the working device is detected by the height sensor, and the working device is lifted and lowered so that the working height reaches a preset height.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-59267

Disclosure of Invention

Problems to be solved by the invention

In the paddy field working machine, since mud and water are splashed rearward from the machine body as the machine travels, there is room for improvement in that mud and water splashed rearward are less likely to adhere to the height sensor.

The invention aims to prevent mud and water splashed backwards from a machine body from being attached to a height sensor in a paddy field working machine in which a working device is supported at the rear part of the machine body.

Means for solving the problems

The paddy field work machine of the present invention comprises: a working device supported at the rear part of the machine body in a lifting way and used for supplying materials to the field surface; a lifting mechanism capable of lifting and lowering the working device relative to the machine body; a floating plate which is supported at the lower part of the operation device in a lifting way and follows the field surface; a height sensor provided in a portion of the working device on a rear side of a front end portion of the floating plate in a side view; a link mechanism that is connected so as to straddle the floating plate and the height sensor, and that transmits a lifting operation of the floating plate with respect to the working device to the height sensor so that the height sensor detects a working height from the floating plate to the working device; and a control unit that operates the lifting mechanism so that the working height reaches a preset height based on a detection value of the height sensor.

According to the present invention, in a state where the floating plate and the height sensor are provided in the working device at the rear of the machine body and the link mechanism is connected so as to straddle the floating plate and the height sensor, the height sensor is disposed at a position further to the rear side than the front end portion of the floating plate and is disposed so as to be spaced rearward from the machine body.

Thus, even if mud or water splashes rearward from the body, mud or water is less likely to adhere to the height sensor, and a reduction in durability of the height sensor due to adhesion of mud or water can be prevented.

In the present invention, it is preferable that the link mechanism includes: a swing member supported by the working device so as to be swingable about a support axis along a left-right direction, the swing member including a first portion extending forward from the support axis and connected to the floating plate, and a second portion extending upward from the support axis; and a connecting member disposed along the front-rear direction and connected to straddle the input portion of the height sensor and the second portion.

According to the present invention, the link mechanism connected so as to straddle the floating plate and the height sensor is provided with the swinging member and the connecting member. When the working height of the working device changes relative to the floating plate following the ground, the swinging member of the link mechanism swings around the supporting axis, the connecting member moves back and forth, the lifting motion of the floating plate relative to the working device is transmitted to the height sensor, and the working height from the floating plate to the working device is detected by the height sensor.

According to the present invention, the swing member is provided with the second portion extending upward from the support axis, and the connecting member along the front-rear direction is connected so as to straddle the input portion of the height sensor and the second portion of the swing member. The second portion of the swing member allows the height sensor to be disposed at a high position from the floating plate (field surface), which is advantageous in that mud and water are less likely to adhere to the height sensor.

In the present invention, it is preferable that the input portion extends downward from the height sensor, and a lower portion of the input portion is connected to a rear portion of the connecting member.

According to the present invention, in a case where the connecting member is connected so as to straddle the input portion of the height sensor and the second portion of the swing member, the input portion of the height sensor extends downward from the height sensor.

Thus, the height sensor is located at a higher position from the floating plate (field surface) because the position of the height sensor is higher than the swing member by the amount of downward extension of the input portion of the height sensor, which is advantageous in that mud and water are less likely to adhere to the height sensor.

In the present invention, it is preferable that a spring support portion is provided on a rear side of the swing member, an extension spring is connected so as to straddle the first portion and the spring support portion, and the floating plate is biased downward with respect to the working device via the swing member by a biasing force of the extension spring.

In some paddy field working machines, a spring for biasing the floating plate downward with respect to the working device is provided.

According to the present invention, the extension spring is connected to the first portion of the swing member and extends rearward from the first portion of the swing member, and therefore the extension spring is compactly arranged at a low position. By arranging the tension spring at a low position, the tension spring has little effect on the arrangement of the height sensor.

In the present invention, it is preferable that the paddy field working machine includes a set height changing unit capable of changing the set height by vertically changing a support position of the floating plate with respect to the working device, and the paddy field working machine includes an interlocking unit configured to change a position of the support shaft center to a lower side with respect to the working device as the set height is changed to a higher side and to change a position of the support shaft center to a higher side with respect to the working device as the set height is changed to a lower side by an operation of the set height changing unit.

In some paddy field working machines such as riding rice transplanter, a set height changing part capable of changing the set height by changing the support position of a floating plate with respect to a working device is provided. In a riding type rice transplanter, the set height from a floating plate (field surface) to a rice seedling transplanting device (operation device) is changed to change the transplanting depth of the rice seedling transplanting device for rice seedlings.

According to the present invention, since the position of the support axis of the swing member is changed in the same manner as the support position of the floating plate in accordance with the change in the set height by the operation of the set height changing unit, the change in the vertical positional relationship between the floating plate and the support axis of the swing member is small even if the set height is changed.

In contrast, since the height sensor is provided in the working device, when the support position of the floating plate is changed by the set height changing unit, the positional relationship between the support axis center of the floating plate and the swing member and the vertical direction of the height sensor changes.

According to the present invention, since the connecting member is connected so as to straddle the input portion of the height sensor and the second portion of the swing member, even if the positional relationship between the support axial center of the floating plate and the swing member and the vertical direction of the height sensor changes as described above, the change in the positional relationship in the vertical direction is absorbed by the swinging of the connecting member around the connection point with the second portion of the swing member and the swinging of the connecting member around the connection point with the input portion of the height sensor.

Thus, even if the support position of the floating plate is changed by the set height changing unit, the lifting operation of the floating plate with respect to the working device is appropriately transmitted to the height sensor, and the working height from the floating plate to the working device is appropriately detected by the height sensor.

In the present invention, it is preferable that a spring support portion is provided on a rear side of the swing member, an extension spring is connected so as to straddle the first portion and the spring support portion, the floating plate is biased downward with respect to the working device via the swing member by a biasing force of the extension spring, and the paddy field working machine includes a spring interlocking portion that changes a position of the spring support portion in a front-rear direction by an operation of the set height changing portion, and maintains the biasing force of the extension spring constant.

According to the present invention, the tension spring is connected to the first portion of the swing member and extends rearward from the first portion of the swing member, and therefore the tension spring is compactly arranged at a low position. By arranging the tension spring at a low position, the tension spring has less influence on the arrangement of the height sensor.

According to the present invention, as described above, when the set height is changed by the operation of the set height changing unit to change the position of the support axis of the swing member to which the tension spring is connected, the position of the spring support unit is changed in the front-rear direction by the spring interlocking unit, the change in the front-rear interval between the first portion of the swing member and the spring support unit is suppressed to be small, and the biasing force of the tension spring is maintained constant.

Thus, even if the set height is changed and the support position of the floating plate is changed up and down, the floating plate can stably follow the ground.

In the present invention, it is preferable that a support frame is disposed along the left-right direction in a portion of the working device on the rear side of the front end portion of the floating plate, a working portion for supplying a material to the field surface is connected to the support frame and extends from the support frame to the rear side, and the height sensor is provided on the rear side of the support frame in a side view.

In a paddy field working machine, there is a paddy field working mechanism comprising: the support frame is arranged on the working device along the left-right direction, and the working part for supplying materials to the field surface is connected with the support frame and extends towards the rear side, thereby improving the rigidity of the whole working device. In this configuration, the support frame may be disposed in a portion of the working device on the rear side of the front end portion of the floating plate.

According to the present invention, in the above configuration, the height sensor is provided at a position rearward of the support frame in a side view, and thus the height sensor is disposed rearward away from the machine body, which is advantageous in that mud and water are less likely to adhere to the height sensor.

In the present invention, it is preferable that the right and left support frames are provided, and an operating state in which a center side end portion of a left and right center side of the working mechanism in the right support frame and a center side end portion of a left and right center side of the working mechanism in the left support frame face each other with a gap therebetween and the right and left support frames are arranged along the left and right direction, and a non-operating state in which the right and left support frames are arranged in the left and right direction in a posture along the front and rear direction are set, and the paddy field working machine includes a switching mechanism capable of switching the working mechanism between the operating state and the non-operating state, and the link mechanism is arranged between the center side end portions of the right and left support frames in the operating state in a plan view.

In some of the paddy field working machines, a working device is provided with right and left support frames, and is configured to be switchable between a working state in which the right and left support frames are arranged in a right-left direction in a facing state and a non-working state in which the right and left support frames are arranged in a right-left direction in a front-rear direction. In the non-operating state of the working device, the transverse width of the working device is reduced, thereby being beneficial to the transportation and the storage of the paddy field working machine.

According to the present invention, the center side end portion of the right support frame and the center side end portion of the left support frame face each other with a space therebetween in the working state of the working device, and a space is secured near the left and right center portions of the working device.

According to the present invention, the link mechanism is disposed between the center side end portions of the right and left support frames in the working state of the working device in plan view, whereby the link mechanism is reasonably disposed in the vicinity of the right and left center portions of the working device, the operation of connecting the floating plates in the vicinity of the right and left center portions of the working device to the link mechanism is reasonably performed, and a structure for detecting the working height based on the floating plates in the vicinity of the right and left center portions of the working device can be easily obtained.

In the present invention, it is preferable that a support member is attached to a center-side end portion of the support frame on one of right and left sides, and the height sensor and the link mechanism are supported by the support member.

According to the present invention, in the case where the link mechanism is disposed between the center side end portions of the right and left support frames in the working state of the working device in plan view as described above, the height sensor and the link mechanism are supported by the support member attached to the center side end portion of the support frame on one of the right and left sides, and the positions of the height sensor and the link mechanism are stabilized.

In the present invention, it is preferable that the support frame is disposed in a posture along the front-rear direction in the non-working state such that a center side end portion of the support frame is disposed on the rear side with respect to an end portion of the support frame opposite to the center side end portion.

According to the present invention, when the working device is set to the non-working state, the center-side end portion of the support frame is positioned on the rear side (the side opposite to the rear portion of the machine body), and the operator can perform the maintenance work of the height sensor and the link mechanism without being affected by the machine body.

Drawings

Fig. 1 is a left side view of the riding type rice transplanter.

Fig. 2 is a plan view of the riding type rice transplanter.

Fig. 3 is a plan view of the seedling transplanting device in an operating state.

Fig. 4 is a plan view of the seedling transplanting device in a non-operating state.

Fig. 5 is a plan view of the center floating plate, the height sensor and the vicinity of the link mechanism in an operating state of the seedling planting device.

Fig. 6 is a front view of the vicinity of the central floating plate, the height sensor and the link mechanism in an operating state of the seedling planting device.

Fig. 7 is an exploded perspective view of the central float plate, the height sensor, and the link mechanism.

Fig. 8 is a schematic view showing a form of elevation control of the seedling transplanting device.

Fig. 9 is a left side view showing the vicinity of the center floating plate, the height sensor, and the link mechanism in a state where the set height (set insertion depth) is set to the lowest height (deepest).

Fig. 10 is a left side view showing the vicinity of the center floating plate, the height sensor, and the link mechanism in a state where the set height (set insertion depth) is set to the highest height (shallowest).

Detailed Description

Fig. 1 to 10 show a ten-row rice transplanter of a rice field working machine. In fig. 1 to 10, F denotes the front, B denotes the rear, U denotes the upper, D denotes the lower, R denotes the right, and L denotes the left.

(riding type transplanter Integrated Structure)

As shown in fig. 1 and 2, the riding type rice transplanter includes a link mechanism 3 and a hydraulic cylinder 4 (corresponding to a lifting mechanism) for lifting and lowering the link mechanism 3 at the rear part of a machine body 30 having right and left front wheels 1 and right and left rear wheels 2, and a seedling planting device 5 (corresponding to a working device) is supported at the rear part of the link mechanism 3.

With the above configuration, the seedling planting device 5 for planting seedlings (corresponding to materials) on the field surface G is supported at the rear part of the machine body 30 so as to be able to be raised and lowered, and the seedling planting device 5 can be raised and lowered with respect to the machine body 30 by the hydraulic cylinder 4.

(Integrated Structure of seedling transplanting device, fertilizing device, and chemical spreading device)

As shown in fig. 1 and 2, the seedling planting device 5 is provided with: five transplanting transmission boxes 6 (corresponding to operation parts) arranged at predetermined intervals in the left-right direction, a rotating box 7 rotatably supported at the right and left parts of the transplanting transmission boxes 6, transplanting arms 8 supported at both ends of the rotating box 7, one central floating plate 9 (corresponding to a floating plate), four floating plates 10, a seedling table 11, and the like.

The fertilizer applicator 12 is supported so as to straddle the rear portion of the machine body 30 and the seedling planting device 5, and the fertilizer applicator 12 is provided with a hopper 13, a delivery portion 14, a blower 15, a furrow opener 16, a hose 17, and the like.

The driver seat 18 is supported at the rear of the machine body 30. In the fertilizer application device 12, a hopper 13 for storing fertilizer and a delivery unit 14 are provided in a portion of the body 30 on the rear side of the driver seat 18, and a blower 15 is provided on the left lateral outer side of the delivery unit 14. A furrow opener 16 is attached to the center float plate 9 and the float plate 10, and a hose 17 is connected so as to straddle the delivery portion 14 and the furrow opener 16.

In the seedling planting device 5, the planting arm 8 (the rotating box 7) is rotationally driven while the seedling carrying table 11 is laterally fed and driven, and the planting arm 8 takes out the seedling from the lower part of the seedling carrying table 11 and plants (supplies) the seedling to the field surface G.

In the fertilizer application device 12, fertilizer in the hopper 13 is fed out by the feeding portion 14, is supplied to the furrow opener 16 through the hose 17 by the conveyance wind of the blower 15, and is supplied from the furrow opener 16 to the furrow of the field G while forming the furrow on the field G by the furrow opener 16.

The drug dispenser 28 is supported by a support frame 29 connected to the central implant gear box 6. The agent such as herbicide is sprayed from the agent spraying device 28 to the field surface G behind the seedling planting device 5.

(switching structure between operating state and non-operating state in seedling planting device)

As shown in fig. 6, a support frame 19 having a frame shape in front view is provided. The support frame 19 is provided with an upper portion 19a and a lower portion 19b arranged along the left-right direction, right and left longitudinal portions 19c connected so as to straddle the upper portion 19a and the lower portion 19b, a bracket 19d connected to the lower portion 19b, and the like. The bracket 19d of the support frame 19 is supported by the vertical link 3a (see fig. 1) at the rear of the link mechanism 3 so as to be able to roll around the axial center P3 along the front-rear direction.

As shown in fig. 3 and 6, the right and left support arms 20 (corresponding to the switching mechanism) are supported at the right and left portions of the upper portion 19a and the lower portion 19b of the support frame 19 so as to be swingable about the shaft center P1 along the vertical direction.

As shown in fig. 3, a right support frame 21 and a left support frame 22 are provided, and a connection portion 23 is connected to the right support frame 21 and the left support frame 22. The coupling portion 23 of the right support frame 21 is supported at the end of the right support arm 20 so as to be swingable about an axial center P2 along the vertical direction. The connection portion 23 of the left support frame 22 is supported at the end of the left support arm 20 so as to be swingable about an axial center P2 along the vertical direction.

The three transplanting gearboxes 6 are connected to the right support frame 21 and extend from the right support frame 21 to the rear side, and the central floating plate 9 and the two floating plates 10 are supported by the right support frame 21. The two interposing gear boxes 6 are connected to the left support frame 22 and extend rearward from the left support frame 22, and the two floating plates 10 are supported by the left support frame 22.

As shown in fig. 5, 8, 9 and 10, in the seedling planting device 5, the right support frame 21 and the left support frame 22 are disposed at the rear side of the front end portion 9a of the central floating plate 9 and the front end portion 10a of the floating plate 10 in the left-right direction in side view and in plan view.

The state shown in fig. 1, 2, and 3 is the following operation state A1: the left end of the right support frame 21, i.e., the center end 21a on the left and right center sides of the seedling planting device 5, faces the right end of the left support frame 22, i.e., the center end 22a on the left and right center sides of the seedling planting device 5, at a distance from each other, and the right support frame 21 and the left support frame 22 are arranged in the left-right direction.

The switching operation from the operating state A1 to the non-operating state A2 in the seedling planting device 5 is performed as follows.

The seedling carrying table 11 is separated at the boundary part of the right part 11a of six rows and the left part 11b of four rows, the right part 11a of the seedling carrying table 11 belongs to the right supporting frame 21, and the left part 11b of the seedling carrying table 11 belongs to the left supporting frame 22.

Next, the right support arm 20 and the left support arm 20 are swung rearward about the axial center P1 while swinging the right support frame 21 about the axial center P2 in the counterclockwise direction in fig. 3 and swinging the left support frame 22 about the axial center P2 in the clockwise direction in fig. 3.

Thus, as shown in fig. 4, the following non-operating state A2 is set in the seedling planting device 5: the right support frame 21 and the left support frame 22 are arranged in the left-right direction in a posture along the front-rear direction.

In the non-operating state A2 of the seedling planting device 5, the support frames 21, 22 are arranged in a posture along the front-rear direction such that the center

side end portions

21a, 22a of the support frames 21, 22 are arranged on the rear side with respect to the

end portions

21b, 22b of the support frames 21, 22 opposite to the center

side end portions

21a, 22 a.

(center floating plate and supporting structure of floating plate)

As shown in fig. 5 to 8, a right fulcrum frame 25 and a left fulcrum frame 26 are provided. The right fulcrum frame 25 is supported rotatably about an axial center P4 along the left-right direction at the lower portions of the three implant gear boxes 6 coupled to the right support frame 21. The left fulcrum frame 26 is supported rotatably about an axial center P4 along the left-right direction at the lower portions of the two socket transmission cases 6 connected to the left support frame 22.

The engagement portion 24 is connected to the left end of the right fulcrum frame 25, and the engagement portion 24 is connected to the right end of the left fulcrum frame 26. In the operating state A1 of the seedling planting device 5, the right fulcrum frame 25 and the left fulcrum frame 26 are engaged with each other at the engaging portion 24, and the right fulcrum frame and the left fulcrum frame 26 are integrally rotatable.

The

float arms

25a, 26a are connected to the fulcrum frames 25, 26 and extend rearward, and the rear portions of the center float plate 9 and the float plate 10 are supported by the rear portions of the

float arms

25a, 26a so as to be vertically swingable about an axial center P5 along the left-right direction. Thereby, the central floating plate 9 and the floating plate 10 are supported in a liftable manner at the lower portion of the seedling planting device 5 in such a manner as to follow the field surface G in a grounded manner.

(setting of set height from center floating plate (field surface) to seedling transplanting device (transplanting gear box))

As shown in fig. 5, 6 and 8, in the seedling planting device 5, a sector-shaped operating gear 27 is supported on an upper portion of a portion belonging to the left support frame 22 so as to be swingable about an axial center P6 along the front-rear direction, and a gear mechanism 31 having a pinion 31a to be engaged with the operating gear 27 and an electric motor 32 (corresponding to a set height changing portion) for driving the gear mechanism 31 are provided. A coupling lever 35 is connected so as to straddle the engaging portion 24 of the left support frame 22 and the operating gear 27.

As shown in fig. 1, 2, and 8, a knob switch type set height operating element 33 (corresponding to a set height changing portion) is provided in the vicinity of a steering wheel 34 that steers the front wheel 1, and an operating position of the set height operating element 33 is input to a control device 40 (corresponding to a control portion) provided in the machine body 30.

In the operating state A1 of the seedling planting device 5, when the driver riding on the machine body 30 operates the set height operating element 33, the control device 40 actuates the electric motor 32 based on the operating position of the set height operating element 33, the operating gear 27 is operated to swing up and down, and the fulcrum frames 25, 26 are operated to rotate about the axial center P4 via the coupling lever 35. When the fulcrum frames 25 and 26 are rotated, the positions of the

float arms

25a and 26a of the fulcrum frames 25 and 26 are changed up and down, and the position of the shaft center P5 is changed up and down.

Thus, the set height H1 from the central floating plate 9 and the floating plate 10 (the field surface G) to the seedling planting device 5 (the planting transmission box 6) is set for the central floating plate 9 and the floating plate 10 which follow the field surface G in a grounding manner, and the set height H1 is changed by operating the set height operating element 33 so that the supporting position (the position of the axis P5) of the central floating plate 9 (the floating plate 10) with respect to the seedling planting device 5 (the planting transmission box 6) is changed up and down.

(Structure of height sensor)

As shown in fig. 5 to 9, the support member 36 is connected to the center side end 21a of the right support frame 21. A potentiometer-type height sensor 38 is supported by a bracket 37 connected to the support member 36, and an arm-shaped input portion 38a of the height sensor 38 is provided to the height sensor 38 so as to be swingable about an axial center P7 along the left-right direction, and extends downward from the height sensor 38.

Thus, in the seedling planting device 5, the height sensor 38 is provided at a portion on the rear side of the front end portion 9a of the central floating plate 9 and the front end portion 10a of the floating plate 10, and the height sensor 38 is provided at a portion on the rear side of the right support frame 21 and the left support frame 22, respectively, in a side view and a top view. The height sensor 38 is disposed above the fulcrum frame 25 in a side view, and is disposed at substantially the same height as the upper surface portion of the implant gear box 6.

(Structure of Link mechanism)

As shown in fig. 5 to 9, a link mechanism 39 is connected so as to straddle the front portion of the central floating plate 9 and the input portion 38a of the height sensor 38, and the link mechanism 39 includes a swinging member 41 and a connecting member 42.

The balance-shaped interlocking portion 43 is supported by the support member 36 so as to be swingable about an axial center P8 along the left-right direction, and an arm 25b connected to the fulcrum frame 25 and extending forward is connected to the rear portion of the interlocking portion 43, whereby the posture of the interlocking portion 43 is set.

The swinging member 41 is supported swingably about an axial center P9 (corresponding to a support axial center) in the left-right direction at the front portion of the interlocking portion 43, and the swinging member 41 is supported swingably on the seedling planting device 5 via the interlocking portion 43. The swing member 41 is provided with a first portion 41a extending forward from the shaft center P9 and a second portion 41b extending upward from the shaft center P9, and the front portion of the first portion 41a is connected to the front portion of the center floating plate 9 via a link member 44.

The connecting member 42 is disposed along the front-rear direction, the front portion of the connecting member 42 is connected to the upper portion of the second portion 41b of the swing member 41, the rear portion of the connecting member 42 is connected to the lower portion of the input portion 38a of the height sensor 38, and the connecting member 42 is connected so as to straddle the input portion 38a of the height sensor 38 and the second portion 41b of the swing member 41. Thereby, the height sensor 38 and the link mechanism 39 are supported by the support member 36.

(Structure of extension spring)

As shown in fig. 5 to 9, a balance-shaped spring support portion 46 is supported by the bracket 45 coupled to the rear portion of the support member 36 so as to be swingable about the axial center P10 along the left-right direction, and the spring support portion 46 is provided on the rear side with respect to the swing member 41 of the link mechanism 39. An arm 25c (corresponding to a spring interlocking portion) coupled to the fulcrum frame 25 and extending rearward is connected to a front portion of the spring support portion 46, and the posture of the spring support portion 46 is set.

The coil spring-like tension spring 47 is connected so as to straddle the lower portion of the first portion 41a of the swing member 41 and the rear portion of the spring support portion 46. The tension spring 47 is disposed at a lower position in the front-rear direction with respect to the swing member 41, the interlocking portion 43, and the fulcrum frame 25.

The swinging member 41 is urged counterclockwise in fig. 8 and 9 by the urging force of the tension spring 47, the center floating plate 9 is urged downward with respect to the seedling planting device 5 (planting transmission case 6) via the swinging member 41 and the link member 44, and the center floating plate 9 follows the field G in a grounded manner.

(relationship between the height sensor and the link mechanism and the seedling transplanting device between the operating state and the non-operating state)

As shown in fig. 3, 5, and 6, in the operating state A1 of the seedling planting device 5, the center side end 21a of the right support frame 21 and the center side end 22a of the left support frame 22 face each other with a space therebetween, and the right support frame 21 and the left support frame 22 are arranged in the left-right direction.

In the operating state A1 of the seedling planting device 5, the link mechanism 39, the height sensor 38, and the tension spring 47 are disposed between the center-side end 21a of the right-side support frame 21 and the center-side end 22a of the left-side support frame 22 in plan view. The center floating plate 9 is disposed below the center side end 21a of the right support frame 21 and the center side end 22a of the left support frame 22 in a plan view and a side view.

As shown in fig. 4, in the non-operating state A2 of the seedling planting device 5, the right support frame 21 and the left support frame 22 are arranged in postures along the front-rear direction such that the center-side end 21a of the right support frame 21 and the center-side end 22a of the left support frame 22 are arranged on the rear side with respect to the

ends

21b and 22b of the support frames 21 and 22 opposite to the center-side ends 21a and 22 a.

The support member 36 connected to the center side end 21a of the right support frame 21 supports the height sensor 38, the link mechanism 39, and the tension spring 47. In the non-operating state A2 of the seedling planting device 5, the center-side end 21a of the right support frame 21 and the center-side end 22a of the left support frame 22 are located on the rear side (the side opposite to the rear of the machine body 30), and the height sensor 38, the link mechanism 39, the tension spring 47, and the center floating plate 9 are located on the rear side (the side opposite to the rear of the machine body 30).

(lifting control of seedling transplanting device)

As shown in fig. 8, a control valve 48 for operating the hydraulic cylinder 4 by performing a supply/discharge operation of hydraulic oil to/from the hydraulic cylinder 4 is provided, and the control valve 48 is operated by the control device 40 as described below.

When the seedling planting device 5 (planting transmission case 6) performs a lifting operation with respect to the central floating plate 9 that follows the ground surface G to change the working height H2 from the central floating plate 9 (ground surface G) to the seedling planting device 5 (planting transmission case 6), the swing member 41 swings about the axis P9 in the link mechanism 39, the connecting member 42 moves back and forth, and the lifting operation of the central floating plate 9 with respect to the seedling planting device 5 (planting transmission case 6) is transmitted to the input portion 38a of the height sensor 38.

Thus, the working height H2 from the central floating plate 9 (field surface G) to the seedling planting device 5 (planting transmission case 6) is detected by the height sensor 38, and the working height H2 detected by the height sensor 38 is inputted to the control device 40.

The control device 40 operates the control valve 48 so that the working height H2 detected by the height sensor 38 reaches a preset set value, and operates the hydraulic cylinder 4 to raise and lower the seedling planting device 5 (planting transmission case 6) relative to the machine body 30. The set value is set at the approximate center of the detection range of the height sensor 38, is fixed to the height sensor 38, and corresponds to the set height H1.

The seedling planting device 5 (planting transmission case 6) is operated to be raised and lowered in such a manner that the working height H2 detected by the height sensor 38 reaches a set value (set height H1), whereby the seedling planting device 5 (planting transmission case 6) is maintained at the set height H1 from the field surface G.

In the seedling planting device 5, the rotating box 7 and the planting arms 8 are rotationally driven at a fixed track, and therefore, by maintaining the seedling planting device 5 (planting transmission box 6) at a set height H1 from the field surface G, the planting depth of the seedlings by the planting arms 8 is maintained at the set planting depth. The set height H1 corresponds to a set implant depth.

(Change of set height)

As described above (setting of the set height from the central floating plate (field surface) to the seedling planting device (planting gear box)) and as shown in fig. 8, the set height H1 (set planting depth) is changed by operating the set height operating element 33.

The state shown in fig. 8 is an intermediate state in which the set height H1 (set insertion depth) is set between the lowest height (deepest) and the highest height (shallowest).

The state shown in fig. 9 is a state in which the fulcrum frames 25 and 26 are rotated counterclockwise in fig. 8, and the set height H1 (set insertion depth) is set to the lowest height (deepest).

In the state shown in fig. 9, the seedling planting device 5 (planting transmission case 6) approaches downward toward the central floating plate 9, and therefore the fulcrum frames 25 and 26 are rotated in the counterclockwise direction of fig. 8, whereby the interlocking part 43 swings in the clockwise direction of fig. 8 by the arm 25b of the fulcrum frame 25, and the position of the axial center P9 of the swing member 41 is changed to the high side with respect to the seedling planting device 5 (planting transmission case 6). At the same time, the spring support portion 46 is swung clockwise in fig. 8 by the arm 25c of the fulcrum frame 25, and the connection portion of the tension spring 47 in the spring support portion 46 moves forward.

The state shown in fig. 10 is a state in which the fulcrum frames 25, 26 are rotationally operated in the clockwise direction of fig. 8 so that the set height H1 (set insertion depth) is set to the highest height (shallowest).

In the state shown in fig. 10, since the seedling planting device 5 (planting transmission case 6) is separated upward from the central floating plate 9, the fulcrum frames 25 and 26 are rotated clockwise in fig. 8, whereby the interlocking part 43 is swung counterclockwise in fig. 8 by the arm 25b of the fulcrum frame 25, and the position of the axial center P9 of the swing member 41 is changed to the lower side with respect to the seedling planting device 5 (planting transmission case 6). At the same time, the spring support portion 46 is swung counterclockwise in fig. 8 by the arm 25c of the fulcrum frame 25, and the connecting portion of the tension spring 47 in the spring support portion 46 is moved rearward.

As described above, even if the set height H1 (set insertion depth) is changed, the positional relationship in the vertical direction between the center floating plate 9 and the axial center P9 of the swing member 41 is less changed.

As the spring support portion 46 is operated to swing in accordance with the change of the set height H1 (set insertion depth), the change of the front-rear interval between the first portion 41a of the swing member 41 and the spring support portion 46 is small, and the urging force of the tension spring 47 is maintained constant even if the set height H1 (set insertion depth) is changed.

In contrast, since the height sensor 38 is provided in the seedling planting device 5 (planting transmission case 6), when the set height H1 (set planting depth) is changed as described above, the positional relationship between the axial center P9 of the central floating plate 9 and the swinging member 41 and the height sensor 38 in the vertical direction changes.

In this case, since the connecting member 42 is connected so as to straddle the input portion 38a of the height sensor 38 and the second portion 41b of the swing member 41, even if the positional relationship between the axial center P9 of the center floating plate 9 and the swing member 41 and the height sensor 38 in the vertical direction changes as described above, the change in the positional relationship in the vertical direction is absorbed by the swinging of the connecting member 42 about the connection point with the second portion 4b of the swing member 41 and the swinging of the connecting member 42 about the connection point with the input portion 38a of the height sensor 38.

Thus, the posture corresponding to the set value of the input portion 38a of the height sensor 38 does not change, and even if the set height H1 (set insertion depth) is changed, the changed set height H1 (set insertion depth) corresponds to the set value of the height sensor 38.

The changed set height H1 (set planting depth) corresponds to the set value of the height sensor 38, and thus the seedling planting device 5 (planting transmission case 6) is operated to be lifted up and down so that the working height H2 detected by the height sensor 38 reaches the set value as described above (lifting control of the seedling planting device), whereby the seedling planting device 5 (planting transmission case 6) is maintained at the changed set height H1 (the planting depth of the seedling is maintained at the changed set planting depth).

In other words, when the set height H1 (set insertion depth) is changed, the position of the axial center P9 of the swing member 41 is changed vertically, which can be regarded as an amount obtained by adding or subtracting the position change of the axial center P9 of the swing member 41 to or from the working height H2 detected by the height sensor 38.

Thus, when the set height H1 (set transplanting depth) is changed, it can be considered that the raising and lowering operation of the seedling transplanting device 5 (transplanting transmission box 6) is performed so that the working height H2 detected by the height sensor 38 and subjected to the addition or subtraction reaches the changed set height H1 (set transplanting depth).

(first other embodiment of the invention)

The following may be configured: the relationship between the right support frame 21 and the left support frame 22 is reversed, three transplanting boxes 6, the central floating plate 9, and two floating plates 10 are supported by the left support frame 22, and two transplanting boxes 6 and two floating plates 10 are supported by the right support frame 21.

The following may be configured: in this configuration, the support member 36 is connected to the center-side end 22a of the left support frame 22, and the support member 36 is supported by the height sensor 38, the link mechanism 39, and the tension spring 47.

(second other embodiment of the invention)

The following may be configured: in the height sensor 38, an input portion 38a of the height sensor 38 extends upward from the height sensor 38.

(third other embodiment of the invention)

The following configurations are possible: instead of the set height operating element 33 and the electric motor 32, an insertion depth lever (not shown) is coupled to the fulcrum frames 25 and 26, and the driver operates the insertion depth lever to rotate the fulcrum frames 25 and 26 to change the set height H1.

(fourth other embodiment of the invention)

The seedling transplanting device 5 may be configured as an eight-row transplanting type, a six-row transplanting type, a five-row transplanting type, or a four-row transplanting type.

In this configuration, the right support frame 21 and the left support frame 22 may be eliminated, and one support frame (not shown) may be disposed along the left-right direction.

(fifth other embodiment of the invention)

The following may be configured: a soil preparation device (not shown) for preparing the soil of the field G by being rotationally driven about an axial center along the left-right direction is supported on the front side with respect to the right support frame 21 and the left support frame 22.

The following may be configured: in this configuration, when the seedling planting device 5 is set to the non-operating state A2, the soil preparation device is separated into a portion corresponding to the support frame 19, a portion corresponding to the right support frame 21, and a portion corresponding to the left support frame 22, and the portions of the soil preparation device corresponding to the right support frame 21 and the left support frame 22 move together with the right support frame 21 and the left support frame 22.

Industrial applicability

The present invention can be used not only for a riding type rice transplanter but also for a riding type direct seeder in which a seeder (corresponding to a working device) for supplying seeds (corresponding to a material) to a field G is supported on the rear portion of a machine body 30, and a riding type management machine in which a chemical supply device for supplying chemicals (corresponding to a material) to a field G is supported on the rear portion of a machine body 30.

Description of the reference numerals

4: a hydraulic cylinder (lifting mechanism); 5: a seedling transplanting device (working device); 6: an insertion transmission case (operation part); 9: a central float plate (float plate); 9a: a front end portion; 20: a support arm (switching mechanism); 21: a support frame; 21a: a central side end; 21b: an end portion; 22: a support frame; 22a: a central side end; 22b: an end portion; 25c: an arm (spring linkage); 30: a body; 32: an electric motor (set height changing unit); 33: a set height operation member (set height changing section); 36: a support member; 38: a height sensor; 38a: an input section; 39: a link mechanism; 40: a control device (control unit); 41: a swinging member; 41a: a first portion; 41b: a second portion; 42: a connecting member; 43: a linkage section; 46: a spring support; 47: an extension spring; a1: an operating state; a2: a non-operating state; g: preparing field surface; h1: setting the height; h2: the working height; p9: axis (support axis).

Claims

1. A paddy field working machine is characterized by comprising:

a working device supported at the rear part of the machine body in a lifting way and used for supplying materials to the field surface;

a lifting mechanism capable of lifting and lowering the working device relative to the machine body;

a floating plate which is supported at the lower part of the operation device in a lifting way and follows the field surface;

a height sensor provided in a portion of the working device on a rear side of a front end portion of the floating plate in a side view;

a link mechanism that is connected so as to straddle the floating plate and the height sensor, and that transmits a lifting operation of the floating plate with respect to the working device to the height sensor so that the height sensor detects a working height from the floating plate to the working device; and

and a control unit that operates the lifting mechanism so that the working height reaches a preset height based on a detection value of the height sensor.

2. The paddy field working machine according to claim 1,

the link mechanism has:

a swing member supported by the working device so as to be swingable about a support axis along a left-right direction, the swing member including a first portion extending forward from the support axis and connected to the floating plate, and a second portion extending upward from the support axis; and

and a connecting member disposed along the front-rear direction and connected to straddle the input portion of the height sensor and the second portion.

3. A paddy field working machine as claimed in claim 2,

the input portion extends downward from the height sensor, and a lower portion of the input portion is connected to a rear portion of the connecting member.

4. A paddy field working machine as claimed in claim 2 or 3,

the spring support portion is provided on the rear side with respect to the swing member,

the extension spring is connected across the first portion and the spring support portion,

the floating plate is biased downward with respect to the working device via the swing member by the biasing force of the tension spring.

5. A paddy field working machine as claimed in any one of claims 2 to 4,

the paddy field working machine is provided with a set height changing part which can change the set height by changing the supporting position of the floating plate relative to the working device up and down,

the paddy field working machine is provided with a linkage part, wherein the linkage part enables the position of the supporting shaft center to change to a low side relative to the working device along with the change of the set height to a high side, and the linkage part enables the position of the supporting shaft center to change to a high side relative to the working device along with the change of the set height to a low side.

6. A paddy field working machine as claimed in claim 5,

the floating plate is urged downward with respect to the working device via the swinging member by an urging force of the extension spring,

the paddy field working machine is provided with a spring linkage part, and the spring linkage part changes the position of the spring supporting part along the front-back direction through the work of the set height changing part, so that the applying force of the extension spring is kept constant.

7. A paddy field working machine as claimed in any one of claims 1 to 6,

a support frame is disposed along a left-right direction in a portion of the working device that is rearward of a front end portion of the floating plate,

a working part for supplying materials to the field surface is connected with the supporting frame and extends to the rear side from the supporting frame,

the height sensor is provided at a position rearward of the support frame in a side view.

8. A paddy field working machine as claimed in claim 7,

the paddy field working machine is provided with the support frame on the right and left sides,

the illustrated paddy field working machine is set to an operating state and a non-operating state,

the working state is a state in which the center side end portions of the right and left center sides of the working device in the right support frame and the center side end portions of the left and right center sides of the working device in the left support frame are opposed to each other with a gap therebetween, and the right and left support frames are arranged in the left-right direction,

the non-working state is a state in which the right and left support frames are arranged in the left-right direction in an attitude along the front-rear direction,

the paddy field working machine is provided with a switching mechanism capable of switching the working device between the working state and the non-working state,

the link mechanism is disposed between center side end portions of the right and left support frames in the working state in a plan view.

9. The paddy field working machine as claimed in claim 8,

a support member is mounted to a center side end portion of the support frame on one of right and left sides,

the height sensor and the link mechanism are supported by the support member.

10. The paddy field working machine as claimed in claim 9,

in the non-operating state, the support frame is disposed in a posture along the front-rear direction such that a central side end portion of the support frame is disposed rearward with respect to an end portion of the support frame opposite to the central side end portion.