JP7442405B2 - Paddy field work machine - Google Patents

Description

The present invention relates to a structure for raising and lowering a working device at the rear of a rice paddy working machine such as a riding rice transplanter or a riding direct sowing machine.

In a riding type rice transplanter, which is an example of a paddy field working machine, as disclosed in Patent Document 1, a float that follows the ground contact with the rice field is supported at the bottom of the working device so as to be able to rise and fall, and a height sensor is attached to the working device. A rod is connected across the float and the height sensor.
As a result, the working height from the float (field surface) to the working device is detected by the height sensor, and the working device is operated up and down so that the working height becomes a preset setting height.

Japanese Patent Application Publication No. 2013-59267

As rice field work machines move, mud and water are thrown backwards from the machine body, so there is room for improvement in terms of making it difficult for the mud and water thrown backwards to adhere to the height sensor.
An object of the present invention is to make it difficult for mud and water blown backward from the machine body to adhere to a height sensor in a paddy field work machine in which a working device is supported at the rear of the machine body.

The paddy field working machine of the present invention includes a working device that is movably supported at the rear of the machine body and supplies material to the rice field, a lifting mechanism that can raise and lower the working device with respect to the machine body, and a lower part of the working device. a float that is supported to be movable up and down and follows ground contact with a field surface; a height sensor provided in a portion of the work device on the rear side of the front end of the float as seen from a side; the float and the height sensor; a link mechanism that is connected to and transmits a lifting operation of the float relative to the working device to the height sensor so that the height sensor detects a working height from the float to the working device; A control unit is provided that operates the lifting mechanism so that the working height becomes a preset setting height based on the detected value of the height sensor.

According to the present invention, the float and the height sensor are provided in the working device at the rear of the aircraft body, and when the link mechanism is connected between the float and the height sensor, the height sensor is connected to the front end of the float. It is located further back than the aircraft, and is spaced further back from the aircraft.
This makes it difficult for mud and water to adhere to the height sensor even if it is thrown backwards from the aircraft, and prevents the durability of the height sensor from decreasing due to the adhesion of mud or water. can.

In the present invention, the link mechanism is supported by the working device so as to be swingable around a support axis along the left-right direction, and has a first portion extending forward from the support axis and connected to the float. and a swinging member provided with a second portion extending upward from the support axis, and a swinging member disposed along the front-rear direction and extending between the input portion of the height sensor and the second portion. It is preferable to have a connecting member that is connected to the connecting member.

According to the present invention, the link mechanism connected between the float and the height sensor is provided with the swinging member and the connecting member. When the working height of the working equipment changes with respect to the float that follows the ground contact with the rice field, the swinging member of the link mechanism swings around the support axis, and the connecting member moves back and forth, causing the height of the working equipment to change. The lifting and lowering operation of the float is transmitted to the height sensor, and the working height from the float to the working device is detected by the height sensor.

According to the present invention, the swinging member is provided with the second portion extending upward from the support axis, and the connecting member along the front-rear direction connects the input portion of the height sensor to the second portion of the swinging member. are connected across. The second portion of the swinging member allows the height sensor to be located at a relatively high position from the float, 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 part extends downward from the height sensor, and a lower part of the input part and a rear part of the connection member are connected.

According to the present invention, when the connecting member is connected across the input portion of the height sensor and the second portion of the swinging member, the input portion of the height sensor extends downward from the height sensor. There is.
As a result, the position of the height sensor becomes higher relative to the swinging member by the amount that the input part of the height sensor extends downward, so the height sensor is placed at a relatively high position from the float. This is advantageous in that mud and water are less likely to adhere to the height sensor.

In the present invention, a spring support section is provided on the rear side with respect to the swinging member, and a tension spring is connected across the first portion and the spring support section, so that the spring support section is connected to the first section and the spring support section. Preferably, the float is biased downwardly with respect to the working device via the swinging member.

Paddy field work equipment is sometimes provided with a spring that biases the float downward with respect to the work equipment.
According to the present invention, the tension spring is connected to the first portion of the swinging member and extends rearward from the first portion of the swinging member, so that the tension spring is compactly located at a relatively low position. Placed. By arranging the tension spring at a low position, the tension spring has less influence on the arrangement of the height sensor.

In the present invention, a set height changing section is provided which can change the set height by vertically changing the support position of the float with respect to the working device, and the setting height changing section is configured to change the set height by changing the supporting position of the float relative to the working device up and down. As the height is changed to a higher side, the position of the support axis is changed to a lower side with respect to the working device, and as the set height is changed to a lower side, the position of the support axis is changed to a lower side with respect to the working device. It is preferable that an interlocking part for changing the position of the support axis to a higher side with respect to the working device is provided.

BACKGROUND ART Some paddy field working machines, such as riding rice transplanters, are equipped with a set height changing unit that can change the set height by vertically changing the supporting position of a float relative to the working device. In a riding rice transplanter, by changing the set height from the float (field surface) to the seedling planting device (work device), the planting depth of seedlings by the seedling planting device is changed.

According to the present invention, as the set height is changed by the operation of the set height changing section, the position of the support axis of the swinging member is changed in the same way as the support position of the float, so that the set height is changed. Even if the height is changed, there is little change in the vertical positional relationship between the support axis of the float and the swinging member.
On the other hand, since the height sensor is installed in the working device, when the support position of the float is changed by the set height changing section, the support axis of the float and swinging member and the height sensor , the vertical positional relationship changes.

According to the present invention, since the connecting member is connected across the input portion of the height sensor and the second portion of the swinging member, as described above, the support axis of the float and the swinging member and the height sensor are connected. The connection member swings around the connection point with the second portion of the swinging member even if the vertical positional relationship with the height sensor changes, and the connection member swings around the connection point with the input section of the height sensor. By swinging in this direction, the above-mentioned change in the vertical positional relationship is absorbed.
As a result, even if the support position of the float is changed by the set height change unit, the lifting and lowering operation of the float relative to the work equipment is properly transmitted to the height sensor, and the working height from the float to the work equipment is determined by the height sensor. is detected properly.

In the present invention, a spring support section is provided on the rear side with respect to the swinging member, and a tension spring is connected across the first portion and the spring support section, so that the spring support section is connected to the first section and the spring support section. , the float is biased downwardly with respect to the working device via the swinging member, and the position of the spring support portion is changed along the front-rear direction by the operation of the set height changing portion; It is preferable that a spring interlocking part is provided that maintains the biasing force of the tension spring constant.

Paddy field work equipment is sometimes provided with a spring that biases the float downward with respect to the work equipment.
According to the present invention, the tension spring is connected to the first portion of the swinging member and extends rearward from the first portion of the swinging member, so that the tension spring is compactly located at a relatively low position. Placed. 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, when the set height is changed by the operation of the set height changing section as described above and the position of the support axis of the swinging member to which the tension spring is connected is changed, the spring interlocking section The position of the spring support part is changed along the front-rear direction, and the change in the front-rear distance between the first part of the swinging member and the spring support part is suppressed to a small value, and the biasing force of the tension spring is maintained constant. .
As a result, even if the set height is changed and the support position of the float is changed up or down, the float will stably follow the ground on the rice field.

In the present invention, a support frame is arranged along the left-right direction at a portion of the work device on the rear side of the front end of the float, and a work unit for supplying materials to the field is connected to the support frame. Preferably, the height sensor extends rearward from the support frame and is provided at a rear side of the support frame in a side view.

In paddy field work equipment, the support frame is arranged along the left and right direction of the work equipment, and the working part that supplies materials to the rice field is connected to the support frame and extends to the rear, improving the overall rigidity of the work equipment. There is something configured like this. In this configuration, the support frame may be arranged at a portion of the working device on the rear side of the front end of the float.

According to the present invention, in the above-described configuration, the height sensor is provided at the rear side of the support frame in side view, so that the height sensor is placed at a distance from the aircraft body, so that mud and water are This is advantageous in that it is less likely to adhere to the sensor.

In the present invention, the right and left support frames are provided, and the center end of the right support frame on the left-right center side of the working device, and the center of the left support frame on the left-right center side of the work device. a working state in which the right and left support frames are arranged along the left-right direction with the side edges butted against each other with a gap between them, and a posture in which the right and left support frames are aligned in the front-rear direction; and a non-working state arranged side by side in the left-right direction, a switching mechanism capable of switching the working device between the working state and the non-working state is provided, and the link mechanism is configured to switch between the working state and the non-working state in a plan view. Preferably, the support frame is disposed between the center end portions of the right and left support frames.

In paddy field work equipment, right and left support frames are provided in the work equipment, and there are two working states in which the right and left support frames are butted against each other and arranged along the left-right direction, and one where the right and left support frames are arranged in front and back. Some devices are configured to be able to switch between a non-working state and a non-working state in which they are arranged side by side in the horizontal direction. In the non-working state of the working device, the width of the working device is reduced, which is advantageous for transporting and storing the paddy working device.

According to the present invention, when the working device is in a working state, the center end of the right support frame and the center end of the left support frame are butted against each other with a gap between them. Space is secured near the center of the left and right sides.

According to the present invention, the link mechanism is disposed between the central end portions of the right and left support frames in the working state of the working device in plan view, so that the link mechanism is forced to move near the left and right center portions of the working device. Therefore, it is possible to easily connect the floats near the left and right center portions of the work device to the link mechanism, and the working height is detected based on the floats near the left and right center portions of the work device. easily obtained.

In the present invention, it is preferable that a support member is attached to a central end of one of the right and left support frames, and that the height sensor and the link mechanism are supported by the support member. .

According to the present invention, when the link mechanism is configured to be disposed between the central end portions of the right and left support frames in the working state of the working device in plan view as described above, By supporting the height sensor and the link mechanism on the support member attached to the central end of one of the support frames, the positions of the height sensor and the link mechanism are stabilized.

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

According to the present invention, when the work equipment is set to the non-working state, the central end of the support frame is located on the rear side (opposite the rear of the machine), and the worker is not affected by the machine. Can perform maintenance work on height sensors and link mechanisms.

It is a left side view of a riding-type rice transplanter. FIG. 2 is a plan view of a riding rice transplanter. FIG. 3 is a plan view of the seedling planting device in a working state. FIG. 2 is a plan view of the seedling planting device in a non-working state. FIG. 3 is a plan view of the vicinity of the center float, height sensor, and link mechanism of the seedling planting device in a working state. FIG. 3 is a front view of the vicinity of the center float, height sensor, and link mechanism of the seedling planting device in a working state. It is an exploded perspective view of a center float, a height sensor, and a link mechanism. It is a schematic diagram showing the form of elevation control of a seedling planting device. It is a left side view of the vicinity of a center float, a height sensor, and a link mechanism showing a state where the set height (set planting depth) is set to the lowest height (deepest). It is a left side view of the center float, the height sensor, and the vicinity of the link mechanism, showing a state in which the set height (set planting depth) is set to the highest height (shallowest).

1 to 10 show a 10-row type riding rice transplanter, which is an example of a paddy field working machine. In FIGS. 1 to 10, F indicates the front direction, B indicates the rear direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction. .

(Overall configuration of riding rice transplanter)
As shown in FIGS. 1 and 2, the riding rice transplanter operates a link mechanism 3 and a link mechanism 3 to raise and lower the rear part of a body 30 that has right and left front wheels 1 and right and left rear wheels 2. A hydraulic cylinder 4 (corresponding to a lifting mechanism) is provided, and a seedling planting device 5 (corresponding to a working device) is supported at the rear of the link mechanism 3 .

With the above configuration, the seedling planting device 5 for planting seedlings (equivalent to materials) on the rice field G is supported in the rear part of the body 30 so as to be able to rise and fall, and the seedling planting device 5 is raised and lowered relative to the body 30 by the hydraulic cylinder 4. It is ready for operation.

(Overall configuration of seedling planting device, fertilization device, and chemical spraying device)
As shown in FIGS. 1 and 2, the seedling planting device 5 has five planting transmission cases 6 (corresponding to the working part) arranged at predetermined intervals in the left and right direction, and the right side of the planting transmission case 6. A rotating case 7 rotatably supported on the left and right sides, a planting arm 8 supported on both ends of the rotating case 7, one center float 9 (equivalent to a float), four floats 10, and a seedling stand. 11 etc. are provided.

A fertilizing device 12 is supported across the rear of the body 30 and the seedling planting device 5, and the fertilizing device 12 is provided with a hopper 13, a feeder 14, a blower 15, a furrower 16, a hose 17, and the like. There is.

A driver's seat 18 is supported at the rear of the fuselage 30. In the fertilizer application device 12, a hopper 13 for storing fertilizer and a feeding section 14 are provided in a portion behind the driver's seat 18 in the body 30, and a blower 15 is provided on the left lateral outside of the feeding section 14. . A groove cutter 16 is attached to the center float 9 and the float 10, and a hose 17 is connected across the feeding portion 14 and the groove cutter 16.

In the seedling planting device 5, the planting arm 8 (rotating case 7) is driven to rotate while the seedling stand 11 is driven horizontally, and the planting arm 8 takes out the seedlings from the lower part of the seedling stand 11. and plant (supply) it on the field G.

In the fertilizer application device 12, the fertilizer in the hopper 13 is fed out by the feeding unit 14, and is supplied to the furrower 16 through the hose 17 by the conveying wind of the blower 15, and the furrower 16 creates grooves in the field G. Fertilizer is supplied from the trencher 16 to the trenches in the field G while the field is being formed.

A chemical spraying device 28 is supported by a support frame 29 connected to the planting transmission case 6 in the center. From the chemical spraying device 28, chemicals such as herbicides are sprayed onto the field G behind the seedling planting device 5.

(Configuration for switching between working state and non-working state in seedling planting device)
As shown in FIG. 6, a frame-shaped support frame 19 is provided when viewed from the front. An upper part 19a and a lower part 19b arranged along the left-right direction on the support frame 19, right and left vertical parts 19c connected across the upper part 19a and the lower part 19b, and a bracket connected to the lower part 19b. 19d etc. are provided. A bracket 19d of the support frame 19 is supported by a rear vertical link 3a (see FIG. 1) of the link mechanism 3 so as to be rollable around an axis P3 along the front-rear direction.

As shown in FIGS. 3 and 6, the right and left support arms 20 (corresponding to a switching mechanism) are configured to swing around an axis P1 along the vertical direction. It is held on the right and left sides of 19b.

As shown in FIG. 3, right and left support frames 21 and 22 are provided, and a connecting portion 23 is connected to the right and left support frames 21 and 22. The connecting portion 23 of the right support frame 21 is supported by the end of the right support arm 20 so as to be swingable around an axis P2 along the vertical direction. The connecting portion 23 of the left support frame 22 is supported by the end of the left support arm 20 so as to be swingable around an axis P2 along the vertical direction.

Three planting transmission cases 6 are connected to the right support frame 21 and extend rearward from the right support frame 21, and a center float 9 and two floats 10 are connected to the right support frame 21. is supported by Two planting transmission cases 6 are connected to the left support frame 22 and extend rearward from the left support frame 22, and two floats 10 are supported by the left support frame 22. There is.

As shown in FIGS. 5, 8, 9, and 10, in the seedling planting device 5, the right and left support frames 21, 22 have front ends 9a, 10a of the center float 9 and the float 10 in side view and plan view. It is arranged along the left and right direction in the rear part.

The states shown in FIGS. 1, 2, and 3 are the center end 21a on the left and right center side of the seedling planting device 5, which is the left end of the right support frame 21, and the seedling planting device, which is the right end of the left support frame 22. This is a working state A1 in which the right and left support frames 21 and 22 are arranged along the left-right direction, with the left and right center end portions 22a of the attachment device 5 being butted against each other with a gap between them.

The switching operation from the working state A1 to the non-working state A2 in the seedling planting device 5 is performed as described below.
The seedling rest 11 is separated at the boundary between the right part 11a of the six rows and the left part 11b of the four rows, and the right part 11a of the seedling rest 11 belongs to the right support frame 21, and The left part 11b belongs to the left support frame 22.

Next, the right support frame 21 is swung counterclockwise in FIG. 3 around the axis P2, and the left support frame 22 is swung clockwise in FIG. The left support arm 20 is swung backward around the axis P1.

As a result, as shown in FIG. 4, in the seedling planting device 5, the right and left support frames 21, 22 are aligned in the front-rear direction, and the seedling planting device 5 is arranged side by side in the left-right direction. Working state A2 is set.

In the non-working state A2 of the seedling planting device 5, the center side ends 21a, 22a of the support frames 21, 22 are connected to the opposite ends 21b, 22b of the support frames 21, 22 from the center side ends 21a, 22a. On the other hand, the support frames 21 and 22 are arranged in a posture along the front-rear direction so as to be arranged on the rear side.

(Configuration of center float and float support)
As shown in FIGS. 5 to 8, right and left fulcrum frames 25, 26 are provided. The right fulcrum frame 25 is rotatably supported by the lower part of the three planting transmission cases 6 connected to the right support frame 21 so as to be rotatable around an axis P4 along the left-right direction. The left fulcrum frame 26 is rotatably supported by the lower portions of the two planting transmission cases 6 connected to the left support frame 22 so as to be rotatable around an axis P4 along the left-right direction.

The occlusion part 24 is connected to the left end of the right fulcrum frame 25, and the occlusion part 24 is connected to the right end of the left fulcrum frame 26. In the working state A1 of the seedling planting device 5, the interlocking portions 24 of the right and left fulcrum frames 25, 26 are engaged, and the right and left fulcrum frames 26 are in a state where they can rotate together.

The float arms 25a, 26a are connected to the fulcrum frames 25, 26 and extend rearward, and the rear parts of the center float 9 and the float 10 can swing up and down around the axis P5 along the left-right direction. It is supported at the rear of the float arms 25a and 26a. Thereby, the center float 9 and the float 10 are supported in the lower part of the seedling planting device 5 so as to be movable up and down so as to follow the ground surface G.

(Setting the height from the center float (field surface) to the seedling planting device (planting transmission case))
As shown in FIGS. 5, 6, and 8, in the seedling planting device 5, a fan-shaped operation gear 27 is mounted on the upper part of the left support frame 22 and swings around an axis P6 along the front-rear direction. A gear mechanism 31 having a pinion gear 31a that engages with the operation gear 27 and an electric motor 32 (corresponding to a set height changing section) that drives the gear mechanism 31 are provided. A linking rod 35 is connected across the engagement portion 24 of the left support frame 22 and the operating gear 27.

As shown in FIGS. 1, 2, and 8, a dial switch-type setting height operating tool 33 (corresponding to a setting height changing section) is provided near a control handle 34 for steering the front wheels 1. The operating position of the setting height operating tool 33 is input to a control device 40 (corresponding to a control section) provided in the aircraft body 30.

In working state A1 of the seedling planting device 5, when a driver on board the aircraft body 30 operates the set height operating tool 33, the electric motor 32 is activated by the control device 40 based on the operating position of the set height operating tool 33. The operating gear 27 is operated to swing up and down, and the fulcrum frames 25 and 26 are rotated about the axis P4 via the linking rod 35. By rotating the fulcrum frames 25 and 26, 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 axis P5 is changed up and down.

As a result, the set height H1 from the center float 9 and float 10 (field surface G) to the seedling planting device 5 (planting transmission case 6) is set for the center float 9 and float 10 that follow the grounding on the field surface G. By operating the setting height operating tool 33, the supporting position (position of the axis P5) of the center float 9 (float 10) with respect to the seedling planting device 5 (planting transmission case 6) is adjusted up or down. , and the set height H1 is changed.

(Height sensor configuration)
As shown in FIGS. 5 to 9, the support member 36 is connected to the center end 21a of the right support frame 21. As shown in FIGS. A potentiometer-type height sensor 38 is supported by a bracket 37 connected to a support member 36, and an arm-shaped input portion 38a of the height sensor 38 can swing around an axis P7 along the left-right direction. It is provided in the height sensor 38 and extends downward from the height sensor 38.

As a result, the height sensor 38 is provided at a portion of the seedling planting device 5 on the rear side of the front end portions 9a and 10a of the center float 9 and the float 10 in a side view and a plan view, and A height sensor 38 is provided on the rear side with respect to 21 and 22. The height sensor 38 is arranged above the fulcrum frame 25 when viewed from the side, and is arranged at approximately the same height as the upper surface of the planting transmission case 6.

(Configuration of link mechanism)
As shown in FIGS. 5 to 9, a link mechanism 39 is connected between the front part of the center float 9 and the input part 38a of the height sensor 38, and the link mechanism 39 is connected to the swinging member 41. It has a member 42.

A balance-shaped interlocking part 43 is supported by the support member 36 so as to be swingable around an axis P8 along the left-right direction, and an arm 25b connected to the fulcrum frame 25 and extending to the front side is interlocked. It is connected to the rear part of the interlocking part 43, and the posture of the interlocking part 43 is set.

The swinging member 41 is swingably supported around an axis P9 (corresponding to a support axis) along the left-right direction of the front part of the interlocking part 43. It is swingably supported by the seedling planting device 5. The swinging member 41 is provided with a first portion 41a extending forward from the axis P9 and a second portion 41b extending upward from the axis P9. is connected to the front part of the center float 9 via a link member 44.

The connecting member 42 is arranged along the front-back direction, and the front part of the connecting member 42 and the upper part of the second part 41b of the swinging member 41 are connected, and the rear part of the connecting member 42 and the input of the height sensor 38 are connected. The connecting member 42 is connected across the input portion 38a of the height sensor 38 and the second portion 41b of the swinging member 41. Thereby, the height sensor 38 and the link mechanism 39 are supported by the support member 36.

(Composition of tension spring)
As shown in FIGS. 5 to 9, a balance-shaped spring support part 46 is supported by a bracket 45 connected to the rear part of the support member 36 so as to be swingable around an axis P10 along the left-right direction. , a spring support portion 46 is provided on the rear side of the swinging member 41 of the link mechanism 39. An arm 25c (corresponding to a spring interlocking part) connected to the fulcrum frame 25 and extending rearward is connected to the front part of the spring support part 46, and the posture of the spring support part 46 is set.

A tension spring 47 in the form of a coil spring is connected across the lower portion of the first portion 41a of the swinging member 41 and the rear portion of the spring support portion 46. The tension spring 47 is arranged at a low position below the swinging member 41, the interlocking part 43, and the fulcrum frame 25 along the front-rear direction.

Due to the biasing force of the tension spring 47, the swinging member 41 is biased in the counterclockwise direction in FIGS. It is urged downward with respect to the planting transmission case 6), and the center float 9 follows the ground surface G.

(Relationship between the height sensor and link mechanism and the working state and non-working state of the seedling planting device)
As shown in FIGS. 3, 5, and 6, in the working state A1 of the seedling planting device 5, the center end 21a of the right support frame 21 and the center end 22a of the left support frame 22 are spaced apart from each other. Right and left support frames 21 and 22 are disposed along the left-right direction so as to be butted against each other with a gap in between.

In the working state A1 of the seedling planting device 5, the link mechanism 39, the height sensor 38, and the tension spring 47 are arranged between the center side ends 21a and 22a of the right and left support frames 21 and 22 in plan view. has been done. The center float 9 is arranged below between the central end portions 21a and 22a of the right and left support frames 21 and 22 in plan view and side view.

As shown in FIG. 4, in the non-working state A2 of the seedling planting device 5, the center side ends 21a, 22a of the right and left support frames 21, 22 are the center side ends 21a, 22a of the support frames 21, 22. The right and left support frames 21 and 22 are arranged in a posture along the front-rear direction so as to be arranged on the rear side with respect to the ends 21b and 22b on the opposite side of the support frame 22a.

A height sensor 38, a link mechanism 39, and a tension spring 47 are supported by a support member 36 connected to the center end 21a of the right support frame 21. In the non-working state A2 of the seedling planting device 5, the central ends 21a and 22a of the right and left support frames 21 and 22 are located on the rear side (opposite the rear of the body 30), and the height The sensor 38, link mechanism 39, tension spring 47, and center float 9 are located on the rear side (opposite the rear of the fuselage 30).

(Elevation control of seedling planting device)
As shown in FIG. 8, a control valve 48 is provided to operate the hydraulic cylinder 4 by supplying and discharging hydraulic oil to the hydraulic cylinder 4. The control valve 48 is operated by the control device 40 as described below. Ru.

The seedling planting device 5 (planting transmission case 6) moves up and down to move the seedling planting device 5 (planting transmission case 6) from the center float 9 (field G) to the center float 9 that follows ground contact with the field surface G. ), the swinging member 41 swings around the axis P9 in the link mechanism 39, the connecting member 42 moves back and forth, and the seedling planting device 5 (planting The vertical movement of the center float 9 relative to the transmission case 6) is transmitted to the input section 38a of the height sensor 38.

As a result, the working height H2 from the center float 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 detected by the height sensor 38 is H2 is input to the control device 40.

The control device 40 operates the control valve 48 and operates the hydraulic cylinder 4 so that the working height H2 detected by the height sensor 38 becomes a preset value, and the seedling planting device 5 (planting transmission case 6) is raised and lowered relative to the fuselage 30. The set value is a value set approximately at the center of the detection range of the height sensor 38, is a value fixed with respect to the height sensor 38, and corresponds to the set height H1.

The seedling planting device 5 (planting transmission case 6) is raised and lowered so that the working height H2 detected by the height sensor 38 becomes the set value (set height H1). 5 (planting transmission case 6) is maintained at a set height H1 from the field G.

In the seedling planting device 5, the rotation case 7 and the planting arm 8 are driven to rotate on a constant trajectory, so the seedling planting device 5 (planting transmission case 6) is maintained at the set height H1 from the field surface G. As a result, the planting depth of the seedlings by the planting arm 8 is maintained at the set planting depth. The set height H1 corresponds to the set planting depth.

(Change of set height)
As described above (Setting the set height from the center float (field surface) to the seedling planting device (planting transmission case)) and as shown in FIG. 8, the set height is set by operating the set height operating tool 33. The depth H1 (set planting depth) is changed.

The state shown in FIG. 8 is an intermediate state in which the set height H1 (set planting 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 planting 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 center float 9, so the fulcrum frames 25 and 26 are rotated counterclockwise in FIG. As a result, the arm 25b of the fulcrum frame 25 causes the interlocking part 43 to swing clockwise in FIG. is changed to the high side. At the same time, the spring support part 46 swings clockwise in FIG. 8 by the arm 25c of the fulcrum frame 25, and the connection part of the tension spring 47 in the spring support part 46 moves forward.

In the state shown in FIG. 10, the fulcrum frames 25 and 26 are rotated clockwise in FIG. 8, and the set height H1 (set planting 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 center float 9, the fulcrum frames 25 and 26 are rotated clockwise in FIG. The arm 25b of the frame 25 causes the interlocking part 43 to swing in the counterclockwise direction in FIG. changed to the lower side. At the same time, the spring support part 46 swings 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 part 46 moves rearward.

As described above, even if the set height H1 (set planting depth) is changed, there is little change in the vertical positional relationship between the center float 9 and the axis P9 of the swinging member 41.
With the change in the set height H1 (set planting depth), the spring support part 46 is operated to swing, so that the longitudinal distance between the first portion 41a of the swing member 41 and the spring support part 46 changes. is small, and even if the set height H1 (set planting depth) is changed, the biasing force of the tension spring 47 is maintained constant.

On the other hand, 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 vertical positional relationship between the center float 9 and the axis P9 of the swinging member 41 and the height sensor 38 changes.

In this case, since the connecting member 42 is connected across the input section 38a of the height sensor 38 and the second portion 41b of the swinging member 41, the axis of the center float 9 and the swinging member 41 is connected as described above. Even if the vertical positional relationship between the core P9 and the height sensor 38 changes, the connecting member 42 will swing around the connection point with the second portion 4b of the swinging member 41, and the connecting member 42 will be By swinging the height sensor 38 around the connection point with the input section 38a, the above-mentioned change in the vertical positional relationship is absorbed.

As a result, the posture corresponding to the set value of the input section 38a of the height sensor 38 does not change, and even if the set height H1 (set planting depth) is changed, the set height H1 (set planting depth) is changed. (planting depth) corresponds to the set value of the height sensor 38.

As the changed setting height H1 (setting planting depth) corresponds to the setting value of the height sensor 38, the height sensor 38, as described in the above-mentioned (elevating control of the seedling planting device) The seedling planting device 5 (planting transmission case 6) is changed by raising and lowering the seedling planting device 5 (planting transmission case 6) so that the detected working height H2 becomes the set value. (The planting depth of the seedlings is maintained at the changed setting planting depth.)

In other words, when the set height H1 (set planting depth) is changed, the position of the axis P9 of the swinging member 41 is changed up or down, so that the height detected by the height sensor 38 is changed. It can be considered that an addition or subtraction is made to the working height H2 by the change in the position of the axis P9 of the swinging member 41.

As a result, when the set height H1 (set planting depth) is changed, the working height H2 detected by the height sensor 38 and added or subtracted is changed to the set height H1 (set planting depth). It can be considered that the raising and lowering operation of the seedling planting device 5 (planting transmission case 6) is performed so that the seedling planting depth is reached.

(First alternative embodiment of the invention)
The relationship between the right support frame 21 and the left support frame 22 is reversed, so that three planting transmission cases 6, a center float 9, and two floats 10 are supported by the left support frame 22, and two The planting transmission case 6 and the two floats 10 may be configured to be supported by the right support frame 21.

In this configuration, the support member 36 is connected to the center end 22a of the left support frame 22, and the height sensor 38, link mechanism 39, and tension spring 47 are configured to be supported by the support member 36. good.

(Second alternative embodiment of the invention)
The height sensor 38 may be configured such that the input portion 38a of the height sensor 38 extends upward from the height sensor 38.

(Third alternative embodiment of the invention)
Instead of the setting height operating tool 33 and the electric motor 32, a planting depth lever (not shown) is connected to the fulcrum frames 25, 26, and the driver operates the planting depth lever to control the fulcrum frame 25. , 26 may be rotated to change the set height H1.

(Fourth alternative embodiment of the invention)
The seedling planting device 5 may be configured as an 8-row planting type, a 6-row planting type, a 5-row planting type, or a 4-row planting type.
In this configuration, the right and left support frames 21 and 22 may be eliminated, and one support frame (not shown) may be arranged along the left-right direction.

(Fifth alternative embodiment of the invention)
A ground leveling device (not shown) leveling the rice field G by being rotationally driven around an axis along the left and right direction is configured to be supported on the front side with respect to the right and left support frames 21 and 22. It's okay.

In this configuration, when the seedling planting device 5 is set to the non-working state A2, the soil leveling device has 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. Separated into parts, the parts corresponding to the right and left support frames 21, 22 of the soil leveling device may be configured to move together with the right and left support frames 21, 22.

The present invention is applicable not only to a riding-type rice transplanter but also to a riding-type direct seeding machine in which a seeding device (corresponding to a working device) for supplying seeds (corresponding to materials) to a field surface G is supported at the rear of the machine body 30, and The present invention can also be applied to a riding-type management machine in which a medicine supply device for supplying medicine (equivalent to materials) is supported at the rear of the machine body 30.

4 Hydraulic cylinder (lifting mechanism)
5 Seedling planting equipment (work equipment)
6 Planting transmission case (working part)
9 Center float (float)
9a Front end 20 Support arm (switching mechanism)
21 Support frame 21a Center side end 21b End 22 Support frame 22a Center side end 22b End 25c Arm (spring interlocking part)
30 Aircraft 32 Electric motor (setting height changing section)
33 Setting height operating tool (setting height changing section)
36 Support member 38 Height sensor 38a Input section 39 Link mechanism 40 Control device (control section)
41 Swinging member 41a First part 41b Second part 42 Connection member 43 Interlocking part 46 Spring support part 47 Tension spring A1 Working state A2 Non-working state G Field H1 Set height H2 Working height P9 Axis center (support axis)

Claims (10)

A working device that is movably supported at the rear of the machine and supplies materials to the rice field;
a lifting mechanism capable of raising and lowering the working device with respect to the aircraft body;
a float that is movably supported at the lower part of the working device and that follows the ground contact with the field surface;
a height sensor provided in a portion of the work device on the rear side of the front end of the float in a side view;
The float is connected to the height sensor, and the height sensor controls the raising and lowering operation of the float with respect to the work device so that the height sensor detects the working height from the float to the work device. a link mechanism that transmits the information to the
The paddy field working machine is provided with a control unit that operates the lifting mechanism so that the working height becomes a preset setting height based on a detected value of the height sensor. The link mechanism is
A first portion is provided, which is supported by the working device so as to be swingable around a support axis along the left-right direction, extends forward from the support axis and is connected to the float, and is connected to the float from the support axis. a swinging member provided with a second portion extending upward;
The paddy field work machine according to claim 1, further comprising a connecting member arranged along the front-rear direction and connected across the input section of the height sensor and the second portion. The paddy field working machine according to claim 2, wherein the input section extends downward from the height sensor, and a lower part of the input section and a rear part of the connection member are connected. a spring support part is provided on the rear side with respect to the swinging member,
a tension spring connected across the first portion and the spring support;
The paddy field working machine according to claim 2 or 3, wherein the float is urged downwardly with respect to the working device via the swinging member by the urging force of the tension spring. a set height changing unit capable of changing the set height by vertically changing the supporting position of the float with respect to the working device;
As the set height is changed to a higher side by the operation of the set height changing unit, the position of the support shaft center is changed to a lower side with respect to the working device, and the set height is changed to the higher side. According to any one of claims 2 to 4, further comprising an interlocking part that changes the position of the support axis to a higher side with respect to the working device as the position of the support axis changes to a lower side. paddy field work machine. a spring support part is provided on the rear side with respect to the swinging member,
a tension spring connected across the first portion and the spring support;
The float is urged downwardly with respect to the working device via the swinging member by the urging force of the tension spring,
According to claim 5, further comprising a spring interlocking part that changes the position of the spring support part along the front-rear direction and maintains the biasing force of the tension spring constant by the operation of the set height changing part. paddy field work machine. a support frame is disposed along the left-right direction in a portion of the work device on the rear side of the front end of the float;
A working unit for supplying materials to the rice field is connected to the support frame and extends rearward from the support frame,
The paddy field work machine according to any one of claims 1 to 6, wherein the height sensor is provided on the rear side of the support frame in side view. right and left support frames are provided;
The center end of the right support frame on the left and right center side of the working device and the left support frame of the work device on the left and right center side are butted against each other with a gap between them. and a working state in which the left support frame is arranged along the left-right direction;
A non-working state is set in which the right and left support frames are arranged side by side in the left-right direction in a posture along the front-back direction,
A switching mechanism capable of switching the working device between the working state and the non-working state is provided,
The paddy field working machine according to claim 7, wherein the link mechanism is disposed between central end portions of the right and left support frames in the working state in plan view. a support member is attached to a central end of one of the right and left support frames;
The paddy field work machine according to claim 8, wherein the height sensor and the link mechanism are supported by the support member. In the non-working state, the support frame is arranged in the front-rear direction such that the center end of the support frame is disposed on the rear side with respect to the end of the support frame opposite to the center end. The paddy field working machine according to claim 9, wherein the paddy field working machine is arranged in a horizontal position.

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