JP2014166161A - Paddy field working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid such a situation that a ground leveling device pushes mud when a ground working device (rear side) and the ground leveling device (front side) are arranged at a rear of a machine body.SOLUTION: A paddy field working machine comprises: a first lift mechanism which lift-drives a ground working device 5; a first height sensor 9 which detects a height of the ground working device 5 to a paddy field G; and first control means which operates the first lift mechanism so that the ground working device 5 is maintained at a set height from the paddy field G on the basis of a detection value of the first height sensor 9. The paddy field working machine also comprises: a second lift mechanism 56 which lift-drives a ground device 53; a second height sensor 94 which detects a height of the ground device 53 to the paddy field G; and second control means which operates the second lift mechanism 56 so that the ground device 53 is maintained at a set height from the paddy field G on the basis of a detection value of the second height sensor 94.

Description

  The present invention relates to a paddy field work machine provided with a ground work device (a seedling planting device or a direct seeding device) and a ground leveling device at the rear part of the machine body.

  In a riding type rice transplanter, which is an example of a paddy field work machine, as disclosed in Patent Document 1, a seedling planting device (corresponding to a ground work device) is supported at the rear of the machine so as to be movable up and down, and the leveling device is used as a seedling. It is connected to the seedling planting device so that it is located on the front side of the planting device, and is configured to perform seedling planting work with the seedling planting device while performing land leveling work on the surface with the leveling device is there.

In Patent Document 1, a hydraulic cylinder that drives the seedling planting device and the leveling device up and down, a control valve that feeds and discharges hydraulic oil to and from the hydraulic cylinder, a center float that detects the height of the seedling planting device relative to the rice field, and a height sensor And the control valve is operated so that the seedling planting device and the leveling device are maintained at the set height from the surface based on the detection value of the height sensor.
Thereby, the planting depth of the seedling by the seedling planting device is maintained at the set depth, and the leveling depth of the leveling device is maintained at the set depth.

JP 2007-267614 A (see FIG. 9)

In Patent Literature 1, since the seedling planting device is configured to perform seedling planting work while performing the leveling work of the field with the leveling device, the leveling device is located on the front side of the seedling planting device, The front and rear positions of the seedling planting device and the leveling device are different.
On the other hand, the center float which detects the height with respect to the rice field is provided in the rear seedling planting device, and detects the height of the seedling planting device with respect to the rice field near the seedling planting device. ing.

  Thus, for example, if there is a raised part on the front surface of the seedling planting device and leveling device, the seedling planting device and leveling device should rise along the raised part as the aircraft advances However, since the center float is provided in the rear seedling planting device, even if the leveling device reaches the raised part, the state that the sensor float does not reach the raised part occurs, and the seedling planting device The ground leveling device may not rise and the aircraft may move forward, pushing the mud where the leveling device is raised.

  The present invention has a ground work device (rear side) and a ground leveling device (front side) at the rear of the machine body, and is configured to perform work by the ground work device while performing leveling work on the surface by the leveling device. The purpose of the present invention is to make it possible to avoid a situation where the leveling device pushes mud.

[I]
(Constitution)
The first feature of the present invention resides in the following configuration in a paddy field work machine.
Support the ground working device at the rear of the aircraft
The ground work device is configured to drive the ground work device up and down, a first height sensor that detects a height of the ground work device with respect to a field surface, and the ground work device based on a detection value of the first height sensor. First control means for operating the first lifting mechanism so as to be maintained at a set height from the surface,
A leveling device for leveling the field surface is supported on the front side of the ground work device so as to be movable up and down,
A second elevating mechanism that drives the leveling device to move up and down, a second height sensor that detects the height of the leveling device with respect to the field, and the leveling device set from the surface based on the detection value of the second height sensor. Second control means for operating the second elevating mechanism so as to be maintained at a height.

(Operation and effect of the invention)
According to the first feature of the present invention, the ground work device moves up and down based on the detection value of the first height sensor, and the leveling device moves up and down based on the detection value of the second height sensor. The leveling devices are in a state of being lifted and lowered independently.

Thereby, for example, when there is a raised part on the front surface of the ground working device and the leveling device, when the leveling device reaches the raised part, the leveling device rises based on the detection value of the second height sensor. The condition where the leveling device pushes mud is avoided, and when the leveling device passes through the raised part, the leveling device descends based on the detection value of the second height sensor, and the leveling device moves from the surface. The set height is maintained.
Next, when the ground work device reaches a raised part, the ground work device rises based on the detection value of the first height sensor, and when the ground work device passes the raised part, the detection value of the first height sensor. The ground work device is lowered based on the above, and the ground work device is maintained at the set height from the surface.

  As described above, the ground leveling device and the leveling device are maintained at the set height from the surface while avoiding the state where the leveling device pushes mud, and the leveling work on the surface by the leveling device and the work by the ground level working device are performed. You can do it properly.

[II]
(Constitution)
The second feature of the present invention resides in the following configuration in the paddy field working machine of the first feature of the present invention.
The second height sensor is constituted by a sled-shaped grounding body that moves up and down so as to follow the surface while grounding the surface.

(Operation and effect of the invention)
According to the second feature of the present invention, as the aircraft moves forward, the second height sensor moves up and down so as to follow the surface while contacting the surface, so that the height of the leveling device relative to the surface is increased by the second height sensor. Simultaneously with the detection, the surface of the field is leveled (leveled) by the second height sensor, and the leveling work of the field by the leveling device can be supplemented by the second height sensor.

[III]
(Constitution)
The third feature of the present invention resides in the following configuration in the paddy field working machine of the first or second feature of the present invention.
The leveling device is constituted by a wide leveling rotor that is driven to rotate around a left and right axis, and the second height sensor is provided at the right or left end of the leveling rotor.

(Operation and effect of the invention)
When the leveling device is constituted by a wide leveling rotor that is driven to rotate around the left and right axis, mud may be splashed forward or backward from the leveling rotor by the rotation of the leveling rotor.
According to the third feature of the present invention, the second height sensor is provided at the right or left end of the leveling rotor, so that even if mud is splashed forward or backward from the leveling rotor, it is splashed off. The mud is less likely to adhere to the second height sensor, and it is less likely that the mud adheres to hinder the operation of the second height sensor.

[IV]
(Constitution)
A fourth feature of the present invention resides in the following configuration in the paddy field working machine of the third feature of the present invention.
The leveling rotor includes a drive shaft that is arranged in the left-right direction and is rotationally driven, and a plurality of small-sized rotating bodies that are attached to the drive shaft so as to be aligned along the axial direction of the drive shaft. ,
The adjacent rotations by setting the lateral width of the boss portion of the rotating body fitted on the drive shaft to be smaller than the lateral width of the outer peripheral portion which is a leveling portion of the rotating body. The rotating body is attached to the drive shaft so that a gap is generated between the boss portions of the body.

(Operation and effect of the invention)
When the leveling device is composed of a wide leveling rotor that is driven to rotate around the left and right axis, a drive shaft that is arranged in the left and right direction and is driven to rotate, and the drive shaft that is aligned along the axis direction of the drive shaft. The ground leveling rotor may be configured to include a plurality of small rotating bodies to be attached.

  According to the fourth aspect of the present invention, the rotating body is attached to the drive shaft so that a gap is generated between the boss portions of the adjacent rotating bodies. As a result, even if mud enters the inside of the rotating body from between the adjacent rotating bodies in a state where the outer peripheral portion of the rotating body is leveling the surface, the portion between the bosses of the adjacent rotating bodies and the drive shaft portion It is difficult for mud to stay on the surface of the rotating body, and mud stays inside the rotating body, thereby obstructing the rotation of the leveling rotor (rotating body).

[V]
(Constitution)
The fifth feature of the present invention resides in the following configuration in the paddy field working machine of the fourth feature of the present invention.
A bearing portion that rotatably supports the drive shaft is disposed between the boss portions of the adjacent rotating bodies so that the outer peripheral portion of the rotating body covers the bearing portions.

(Operation and effect of the invention)
As described in the previous item [IV], when the rotating body is attached to the drive shaft so that a gap is generated between the boss portions of the adjacent rotating bodies, the bearing portion is mounted as in the fifth feature of the present invention. It can arrange | position easily between the boss | hub parts of an adjacent rotary body.
In this case, as described in the preceding item [IV], the lateral width of the outer peripheral portion that is the leveling portion of the rotating body is larger than the lateral width of the boss portion of the rotating body in the left-right direction. It will be in the state which covers a bearing part. Thereby, since a bearing part will be in the state protected from the rice field by the outer peripheral part of the rotary body, durability of a bearing part can be improved.

[VI]
(Constitution)
A sixth feature of the present invention resides in the following configuration in the paddy field working machine of the fourth or fifth feature of the present invention.
The said rotary body located behind the wheel of a body is comprised by the smaller diameter than the said other rotary body.

(Operation and effect of the invention)
Since the traces that the wheels have passed are more uneven than the other fields, as described in [I] above, the leveling device moves up and down based on the detection value of the second height sensor. However, the rotating body located behind the wheels of the airframe may push mud (particularly large convex portions).

  According to the sixth aspect of the present invention, since the rotating body located behind the wheel of the fuselage is configured to have a smaller diameter than the other rotating bodies, the rotating body located behind the wheel of the fuselage has passed through the wheel. The possibility of hitting a mark (particularly a large convex part) can be reduced, and the state where a rotating body located behind the wheel of the machine body pushes mud (particularly a large convex part) can be reduced.

It is a whole side view of a riding type rice transplanter. It is a side view of a seedling planting device and a leveling device. It is a front view of a seedling planting device and a leveling device. It is a top view of a seedling planting device and a leveling device. It is a side view of the vicinity of the front part of a leveling device and a center float. It is a whole perspective view of the rotary body of a leveling device. It is a longitudinal front view near the bearing part of the leveling device. It is a figure which shows the control apparatus and the cooperation state of each part. In 1st another form of implementation of invention, (A) The cross-sectional top view of a disc member, (B) It is a side view of a disc member. In the 2nd another form of implementation of invention, it is a top view of the leveling apparatus. In 3rd another form of implementation of invention, it is an exploded view of a rotary body. In 3rd another form of implementation of invention, it is a whole perspective view of a rotary body.

[1]
As shown in FIG. 1, a link mechanism 3 that can swing up and down is provided at the rear of the machine body supported by right and left front wheels 1 and right and left rear wheels 2 (corresponding to wheels). A six-row planting type seedling planting device 5 (corresponding to the ground work device) is supported so as to be movable up and down, and a hydraulic cylinder 4 (corresponding to the first lifting mechanism) for driving the link mechanism 3 up and down is provided. A riding type rice transplanter, which is an example of a paddy field work machine, is configured.

Next, the seedling planting device 5 will be described.
As shown in FIGS. 1, 2, and 4, the seedling planting device 5 includes one feed case 17, three transmission cases 6, and a pair of rotation cases 7 that are rotatably supported at the rear part of the transmission case 6. A pair of planting arms 8 provided at both ends of the rotating case 7, a center center float 9 (corresponding to a first height sensor) and a side float 11, and six seedling mounting surfaces, reciprocating horizontally in the horizontal direction The seedling raising table 10 to be driven and the vertical feeding mechanism 25 provided on each of the seedling raising surfaces of the seedling raising table 10 are provided. A feed case 17 and a transmission case 6 are fixed to a support frame 18 arranged in the left-right direction, and the feed case 17 is supported so as to be able to roll around a front and rear axis P1 (see FIG. 3) at the rear lower portion of the link mechanism 3. Has been.

  As shown in FIG. 4, the transverse feed shaft 19 extends from the feed case 17, and the end of the transverse feed shaft 19 is supported by the support frame 18 via the support member 20, and as the transverse feed shaft 19 rotates. A feed member 21 that is driven to reciprocate laterally is fitted on the transverse feed shaft 19, and the feed member 21 is connected to the seedling table 10. A guide rail 38 is supported by the transmission case 6 in the left-right direction, and a lower portion of the seedling bed 10 is supported along the guide rail 38 so as to be laterally movable. As shown in FIGS. 2 and 3, the support member 26 is fixed to the right and left ends of the support frame 18 and extends upward, and the support member 50 is fixed over the upper portion of the support member 26. The guide rail 27 is fixed to the front surface of the upper part of the seedling raising base 10, and the guide rail 27 is supported by the roller 51 supported by the support member 50 so as to be laterally movable.

  As shown in FIG. 2, a belt-type vertical feed mechanism 25 is provided on each of the six seedling setting surfaces of the seedling setting table 10. As shown in FIG. 4, the longitudinal feed shaft 36 extends from the feed case 17, and an end portion of the longitudinal feed shaft 36 is supported by the support frame 18 via a support member 37, so that a pair of drives is performed on the longitudinal feed shaft 36. The arm 36a is fixed. An input unit (not shown) for transmitting power to the six vertical feed mechanisms 25 is provided in the seedling bed 10, and the input unit is located between the drive arms 36 a of the vertical feed shaft 36. As a result, when the seedling bed 10 reaches the right or left end of the reciprocating lateral feed drive, the input portion reaches one drive arm 36a of the vertical feed shaft 36 and is input by one drive arm 36a of the vertical feed shaft 36. The parts are driven, and the seedlings on the seedling table 10 are sent downward by the six vertical feeding mechanisms 25.

Next, the fertilizer application will be described.
As shown in FIG. 1 and FIG. 2, a hopper 12 for storing fertilizer and three feeding portions 13 corresponding to two planting strips are provided on the rear side of the driver seat 31. A blower 14 is provided on the side. Two groovers 15 are fixed to the center float 9 and the side float 11, and six groovers 15 are provided. Six hoses 16 extend between the feeding portion 13 and the groover 15. Is connected.
As described above, a fertilizer application device is configured by the hopper 12, the feeding portion 13, the blower 14, the groove producing device 15, the hose 16, and the like.

[2]
Next, the transmission structure to the seedling planting device 5 and the fertilizer application device (feeding unit 13) will be described.
As shown in FIGS. 1 and 4, the power of the engine 49 is changed from a hydrostatic continuously variable transmission (not shown) for traveling and a planted clutch 87 (see FIG. 8) from a stock transmission (not shown). And, it is transmitted to the input shaft 28 provided in the feed case 17 via the PTO shaft 22.

  As shown in FIG. 4, the power of the input shaft 28 is transmitted to the vertical feed shaft 36, the vertical feed shaft 36 is rotationally driven, and the power of the input shaft 28 is transmitted to the horizontal feed shaft 19 via the horizontal feed speed change mechanism 29. The transverse feed shaft 19 is rotationally driven. The power of the input shaft 28 is transmitted to the transmission chain 30, the transmission shaft 23 installed across the transmission case 6, and the input shaft 32 provided in the transmission case 6, and the power of the input shaft 32 is transmitted to the torque limiter 33, the transmission It is transmitted to the rotating case 7 via the chain 34, the small number of clutches 24, and the drive shaft 35. A cylindrical cover 60 is fixed over the transmission case 6, and the transmission shaft 23 is covered by the cover 60.

  2 and 4, when the planting clutch 87 is operated in the transmission state, the rotary case 7 is moved as shown in FIG. The planting arm 8 is driven to rotate counterclockwise on the page, and the planting arms 8 alternately take out the seedlings from the lower part of the seedling platform 10 and plant them on the field G. The seedling platform 10 reaches the right or left end of the reciprocating lateral feed drive. Then, the seedlings on the seedling table 10 are sent downward by the six vertical feeding mechanisms 25. When the planting clutch 87 is operated in the disconnected state, the reciprocating lateral feed drive of the seedling platform 10, the rotational drive of the rotary case 7, and the vertical feed mechanism 25 are stopped.

  As shown in FIG. 1, the power of the engine 49 is transmitted from the traveling hydrostatic continuously variable transmission to the feeding portion 13 via the fertilizer clutch 90 (see FIG. 8), and the fertilizer clutch 90 is transmitted. When the state is operated, the fertilizer is fed from the hopper 12 by a predetermined amount by the feeding unit 13, and the fertilizer is supplied to the grooving device 15 through the hose 16 by the blower 14, and is passed through the grooving device 15. Fertilizer is supplied to the rice field G. When the fertilizer clutch 90 is operated in the disconnected state, the feeding unit 13 stops.

[3]
Next, the leveling device 53 will be described.
As shown in FIGS. 2, 3, and 4, the boss member 64 is fixed to the left end portion of the support frame 18, and the transmission case 81 is attached to the boss member 64 around the horizontal axis P <b> 2 of the transmission shaft 23 and the input shaft 32. It is supported so as to be swingable up and down and extends obliquely forward and downward. A bracket 82 is fixed to the right end of the support frame 18, and a support arm 83 is swingably supported around the horizontal axis P <b> 2 of the bracket 82 (the horizontal axis P <b> 2 of the transmission shaft 23 and the input shaft 32). The drive shaft 61 having a square cross section is rotatably supported around the left and right axis cores across the transmission case 81 and the support arm 83.

  As shown in FIG. 6, a small-width rotating body 62 integrally formed of a synthetic resin is provided. The rotating body 62 includes a boss portion 62a, a mounting hole 62b having a square cross section formed in the boss portion 62a, a flange portion 62c connected to the boss portion 62a, and a convex leveling portion connected to the outer peripheral portion of the flange portion 62c. It is comprised with the outer peripheral part 62d which is. As shown in FIG. 7, the lateral width W2 of the boss 62a of the rotating body 62 is configured to be smaller than the lateral width W1 of the outer peripheral portion 62d of the rotating body 62.

  As shown in FIGS. 3, 4, and 7, the drive shaft 61 is inserted into the boss portion 62 a (attachment hole 62 b) of the rotating body 62 (the boss portion 62 a of the rotating body 62 is externally fitted to the drive shaft 61). The rotating bodies 62 are attached so as to be aligned along the axial direction of the drive shaft 61, and a wide leveling rotor is constituted by the large number of rotating bodies 62.

  As shown in FIG. 3 and FIG. 7, the end portions of the outer peripheral portion 62 d of the adjacent rotating body 62 are in contact with each other, and the end portion of the adjacent rotating body 62 is in contact with the end portion of the boss portion 62 a. Thus, the position of the rotating body 62 is determined by the spacer 63 that is externally fitted to the drive shaft 61. Accordingly, as shown in FIG. 7, the lateral width W2 of the boss portion 62a of the rotating body 62 is smaller than the lateral width W1 of the outer peripheral portion 62d of the rotating body 62, thereby causing adjacent rotation. There is a gap between the boss portions 62a of the body 62.

  As shown in FIGS. 2, 3, and 4, a bracket 65 is fixed to the transmission case 81 and the support arm 83, a round pipe-shaped support frame 67 is fixed over the bracket 65, and a synthetic resin cover 66 is provided. It is fixed to the support frame 67. The cover 66 is a relatively soft thin plate and is located behind the rotator 62. When the cover 66 is not in contact with the surface G, the lower end of the outer peripheral portion 62d of the rotator 62 and the lower end of the cover 66 are covered. Are located at approximately the same height.

  As shown in FIGS. 2, 3, and 4, the leveling device 53 is configured by the drive shaft 61, the rotating body 62, the cover 66, the support frame 67, the transmission case 81, the support arm 83, and the like. The leveling device 53 is supported on the front part of the seedling planting device 5 (center float 9 and side float 11), the leveling device 53 is arranged behind the rear wheel 2, and the transmission case 81 and the support arm 83 are on the horizontal axis. By swinging up and down around the core P2, the leveling device 53 is supported on the front part of the seedling planting device 5 so as to be movable up and down (the leveling device 53 is supported on the front side of the seedling planting device 5 so as to be movable up and down. State).

[4]
Next, the transmission structure to the leveling device 53 will be described.
As shown in FIG. 4, the transmission shaft 75 connected to the input shaft 32 is disposed inside the boss member 64 and the transmission case 81. Inside the transmission case 81, a sprocket 78 is fitted on the transmission shaft 75 so as to be relatively rotatable, a sprocket 79 is fixed to the drive shaft 61, and a transmission chain 80 is wound around the sprockets 78, 79. A torque limiter 77 is provided between the transmission shaft 75 and the sprocket 78.

  When the power of the engine 49 is transmitted to the input shaft 28, the transmission chain 30, the transmission shaft 23, and the input shaft 32 through the planting clutch 87 and the PTO shaft 22 as shown in the previous item [2] and FIG. 4, The power of the input shaft 32 is transmitted to the drive shaft 61 through the transmission shaft 75, the torque limiter 77, and the transmission chain 80, and the drive shaft 61 and the rotating body 62 are rotationally driven in the counterclockwise direction in FIG.

  In this case, the drive shaft 61 and the rotating body 62 are rotationally driven at a speed higher than the traveling speed of the airframe (the peripheral speed of the outer peripheral portion of the rotating body 62 is higher than the peripheral speed of the outer peripheral portion of the right and left rear wheels 2. The drive shaft 61 and the rotating body 62 are rotationally driven at a high speed so as to be high speed). As a result, the front surface G of the planting arm 8 is leveled (scraped) by the drive shaft 61 and the rotator 62, and mud scattering from the drive shaft 61 and the rotator 62 to the rear is stopped by the cover 66. It is done.

  As shown in FIG. 8, the seedling planting device 5 (planting of seedlings with the planting arm 8) and the fertilizer are operated by operating the planting and fertilization clutches 87, 90 to the transmission and cut-off state by the electric motors 89, 91. Simultaneously with the operation and stop of the (feeding-out part 13), the leveling device 53 (the drive shaft 61 and the rotating body 62) is operated and stopped. When a large load is generated on the drive shaft 61 and the rotating body 62 due to foreign matters such as stones being caught in the drive shaft 61 and the rotating body 62, the drive shaft 61 and the rotating body 62 are driven by the torque limiter 77 (see FIG. 4). The driving shaft 61 and the rotating body 62 are stopped.

[5]
Next, the elevating structure of the leveling device 53 will be described.
As shown in FIGS. 2, 3, and 5, the support frame 52 is fixed to the support frame 18 so as to be positioned on the left side of the link mechanism 3, and a fan-shaped elevating gear around the horizontal axis P <b> 3 of the support frame 52. 54 is supported so as to be swingable up and down, and a gear mechanism 55 having a pinion gear 55a and an electric motor 56 (corresponding to a second elevating mechanism) for driving the gear mechanism 55 are fixed to the support frame 52, and the gear A pinion gear 55 a of the mechanism 55 is engaged with the elevating gear 54.

As shown in FIGS. 3 and 7, a bearing portion 57 is externally fitted to the drive shaft 61 so as to be relatively rotatable by a bearing (not shown) at the center portion of the drive shaft 61, and the bosses of the adjacent rotating bodies 62. The bearing portion 57 is positioned between the portions 62 a, and the end portion of the boss portion 62 a of the adjacent rotating body 62 is in contact with the bearing portion 57.
In this case, since the lateral width W1 of the outer peripheral portion 62d of the rotating body 62 is larger than the lateral width W2 of the boss portion 62a of the rotating body 62, the outer peripheral portion 62d of the rotating body 62 covers the bearing portion 57. It has become.

  As shown in FIGS. 3 and 7, the end of the boss portion 62 a of the adjacent rotating body 62 contacts the bearing member 57, so that a gap is generated between the outer peripheral portions 62 d of the adjacent rotating bodies 62. . Thereby, the rod 58 is connected across the elevating gear 54 and the bearing member 57 through the gap between the outer peripheral portions 62 d of the adjacent rotating bodies 62. As shown in FIGS. 2 and 3, a spring 59 is connected across the bracket 65 and the support member 26, and the leveling device 53 is urged upward by the urging force of the spring 59.

  With the above structure, as shown in FIGS. 2, 3, and 5, the pinion gear 55a of the gear mechanism 55 is rotated forward and backward by the electric motor 56, and the elevating gear 54 is driven to swing up and down around the horizontal axis P3. By doing so, the leveling device 53 is raised and lowered with respect to the seedling planting device 5. In this case, in the state where the seedling planting device 5 is located at the work position as shown in FIG. 8, the electric motor is within the range of the retreat position A3 located above the field surface G and the work position A4 contacting the field surface G. The leveling device 53 can be moved up and down by 56.

  As shown in FIGS. 5 and 8, the potentiometer 74 is fixed to the support frame 52 so as to be positioned on the horizontal axis P3, and the potentiometer 74 and the lifting gear 54 are connected, and the detection value of the potentiometer 74 is controlled. It is input to the device 40. Thereby, the height of the leveling device 53 with respect to the seedling planting device 5 is detected by detecting the angle of the elevating gear 54 with respect to the support frame 52 by the potentiometer 74.

[6]
Next, raising and lowering of the seedling planting device 5 and the leveling device 53 will be described.
As shown in FIGS. 1 and 8, an elevating operation lever 72 is provided on the right side of the driver seat 31, and the elevating operation lever 72 is configured to be freely operated in an ascending position, a neutral position, a descending position, and a planting position. The operation position of the lifting operation lever 72 is input to the control device 40. A potentiometer 88 for detecting the angle of the link mechanism 3 with respect to the aircraft is provided, and the detected value of the potentiometer 88 is input to the control device 40. By detecting the angle of the link mechanism 3 with respect to the aircraft, seedling planting with respect to the aircraft The height of the device 5 can be detected.

  As shown in FIG. 8, a control valve 71 that supplies and discharges hydraulic oil to and from the hydraulic cylinder 4 to expand and contract the hydraulic cylinder 4, an electric motor 89 that operates the planting clutch 87 in a transmission and shut-off state, and a fertilizer clutch 90. Is provided with an electric motor 91 for operating in a transmission and shut-off state. As described in [7] to [11], which will be described later, the lifting control means 73 (corresponding to the first control means) as software, the rolling control means 76, and the leveling control means 85 (corresponding to the second control means) are controlled. The device 40 is provided.

  As a result, the control valve 71, the electric motors 56, 89, 91, the lift control means 73, the rolling control means 76, and the leveling control means 85 are operated by the control device 40, and the following operations and [7] to [7] to be described later. The operation described in [11] is performed.

  As shown in FIG. 8, when the elevating operation lever 92 is operated to the raised position, the planting and fertilizing clutches 87 and 90 are operated to the disconnected state, the leveling device 53 is operated to the retracted position A3, the leveling control means 85, With the control means 73 and the rolling control means 76 stopped, the hydraulic cylinder 4 is contracted to raise the seedling planting device 5. When the seedling planting device 5 reaches the upper limit position of the link mechanism 3, the hydraulic cylinder 4 stops, and the seedling planting device 5 stops at the upper limit position.

  As shown in FIG. 8, when the elevating operation lever 92 is operated to the neutral position, the planting and fertilizing clutches 87 and 90 are operated in the disconnected state, the leveling device 53 is operated to the retreat position A3, and the leveling control means 85 is moved up and down. With the control means 73 and the rolling control means 76 stopped, the hydraulic cylinder 4 stops and the raising / lowering of the seedling planting device 5 stops.

  As shown in FIG. 8, when the elevating operation lever 92 is operated to the lowered position, the planting and fertilizing clutches 87 and 90 are operated to the disconnected state, the leveling device 53 is operated to the retreat position A3, the leveling control means 85, When the control means 73 and the rolling control means 76 are stopped, the hydraulic cylinder 4 is extended and the seedling planting device 5 is lowered. When the center float 9 comes into contact with the rice field G, the elevation control means 73 and the rolling control are performed. Means 76 is activated.

  As shown in FIG. 8, when the elevating operation lever 92 is operated to the planting position, the planting and fertilization clutches 87 and 90 are operated to the transmission state, the leveling device 53 is operated to the work position A4, and the leveling control means 85, The raising / lowering control means 73 and the rolling control means 76 operate | move.

[7]
Next, the structure of the raising / lowering control means 73 of the seedling planting apparatus 5 will be described.
As shown in FIGS. 5 and 8, the support shaft 41 is rotatably supported around the horizontal axis P4 at the lower portion of the transmission case 6, and the support arm 41a fixed to the support shaft 41 extends obliquely rearward and downward. The rear portions of the center float 9 and the side float 11 are supported so as to be swingable up and down around the horizontal axis P5 at the rear end of the support arm 41a. As shown in FIGS. 3 and 8, an artificially operable planting setting height lever 42 is fixed to the support shaft 41 and extends forward and upward, and a lever guide 43 fixed to the support frame 18. In addition, a planting setting height lever 42 is inserted.

  As shown in FIGS. 5 and 8, the support shaft 41 and the support arm 41 a are rotated by the planting setting height lever 42, and the horizontal axis P <b> 5 (center float 9 and side float 11) is moved up and down. By changing, the setting height A1 (setting depth) described later can be changed. By engaging the planting setting height lever 42 with the lever guide 43, the horizontal axis P5 (center float) 9 and the side float 11) can be fixed, and the set height A1 (set depth) can be set.

  As shown in FIG. 8, a potentiometer 44 that detects the angle of the support shaft 41 is fixed to the support frame 18, and a detection value of the potentiometer 44 is input to the control device 40. By detecting the angle of the support shaft 41 with the potentiometer 44, the position of the horizontal axis P5 (center float 9 and side float 11) can be detected. As described above, the planting setting height lever 42 When the set height A1 (set depth) is set by the control device 40, the set height A1 (set depth) is recognized by the control device 40 based on the detection value of the potentiometer 44 (see description of [8] described later).

  As shown in FIGS. 5 and 8, a bracket 45 is fixed to the support frame 18 above the center float 9, and a potentiometer 68 (corresponding to a first height sensor) is fixed to the bracket 45. A rod 69 is connected across the arm 68 a and the front part of the center float 9. A spring 86 that biases the detection arm 68a of the potentiometer 68 downward is provided, and the front portion of the center float 9 is biased downward by the spring 86, and the detection value of the potentiometer 68 is input to the control device 40. Yes. An artificially operable dial type sensitivity setting switch 70 is provided, and an operation position of the sensitivity setting switch 70 is input to the control device 40.

  As a result, as shown in FIGS. 5 and 8, the center float 9 follows the ground surface G to contact the ground surface G, whereby the center float 9 and the potentiometer 68 cause the surface G (center) on the surface G below the seedling planting device 5. The height from the float 9) to the seedling planting device 5 (the seedling planting depth by the planting arm 8) can be detected.

  The state shown in FIG. 5 and FIG. 8 is a state in which the position of the horizontal axis P5 (center float 9 and side float 11) is set by the planting setting height lever 42, and based on the detection value of the potentiometer 44, This is a state in which a set height A1 (set depth) corresponding to the position of the shaft core P5 (center float 9 and side float 11) is set. In this state, for example, the detection value of the potentiometer 68 where the bottom surface of the center float 9 is horizontal is set as the set detection value B1 corresponding to the set height A1 (set depth).

[8]
Next, the action | operation of the raising / lowering control means 73 of the seedling planting apparatus 5 is demonstrated.
As shown in the previous item [7] and FIG. 8, the set height A1 (set depth) is recognized by the control device 40 based on the detected value of the potentiometer 44, and the set detected value corresponding to the set height A1 (set depth). B1 is set.

  As shown in FIGS. 5 and 8, the center float 9 follows the ground surface G while the seedling planting device 5 moves up and down, and accordingly, seedling planting from the field surface G (center float 9). The height to the device 5 (planting depth of the seedling by the planting arm 8) tends to change. Thereby, the height from the rice field G (center float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) is detected by the potentiometer 68, and the set detection value B1 (set height) A difference between A1 (set depth)) and the detected value of the potentiometer 68 is detected.

  As a result, the difference between the set detection value B1 (set height A1 (set depth)) and the detected value of the potentiometer 68 disappears, and the detected value of the potentiometer 68 becomes the set detection value B1 (set height A1 (set depth). )), The hydraulic cylinder 4 is extended and contracted to move the seedling planting device 5 up and down, and the seedling planting depth by the seedling planting device 5 (planting arm 8) is maintained at the set depth. (The height from the rice field G (center float 9) to the seedling planting device 5 (planting depth of the seedling by the planting arm 8) is maintained at the set height A1 (set depth)).

  As shown in FIGS. 5 and 8, when the position of the horizontal axis P5 (center float 9 and side float 11) is changed by the planting setting height lever 42, a new setting height A1 (setting depth) is set. Is done. Along with this, based on the detection value of the potentiometer 44, for example, the detection value of the potentiometer 68 in which the bottom surface of the center float 9 is horizontal corresponds to the above-described new setting height A1 (setting depth). This is set as the detection value B1, so that the seedling planting depth by the seedling planting device 5 (planting arm 8) can be changed.

  In this case, the set detection value B1 (set height A1 (set depth)) can be slightly changed by the sensitivity setting switch 70. When the sensitivity setting switch 70 is operated to the neutral position N, the set detection value B1 (set height A1 (set depth)) is not changed (the horizontal axis P5 (center float) by the planting set height lever 42). 9 and the side float 11) are set, and a set detection value B1 (set height A1 (set depth)) corresponding to the position of the horizontal axis P5 (center float 9 and side float 11) is set. State).

  When the sensitivity setting switch 70 is operated to the sensitive side, the setting detection value B1 (setting height A1 (setting depth)) shown in FIG. 8 is changed to a slightly lower side corresponding to the operation position of the sensitivity setting switch 70. As a result, the bottom surface of the center float 9 at the set detection value B1 (set height A1 (set depth)) is slightly downward, the contact area of the center float 9 to the surface G increases, and the center float 9 becomes the surface. Since it comes to follow G sensitively, the raising / lowering of the seedling planting device 5 by the hydraulic cylinder 4 is set to be sensitive.

  When the sensitivity setting switch 70 is operated to the insensitive side, the setting detection value B1 (setting height A1 (setting depth)) illustrated in FIG. 8 is changed to a slightly higher side corresponding to the operation position of the sensitivity setting switch 70. Thereby, the bottom surface of the center float 9 at the set height A1 (set depth) is slightly upward, the contact area of the center float 9 to the surface G is reduced, and the center float 9 follows the surface G insensitively. Therefore, the raising / lowering of the seedling planting device 5 by the hydraulic cylinder 4 is set to be insensitive.

[9]
Next, the structure and operation of the rolling control means 76 of the seedling planting device 5 will be described.
As shown in the description in [1] and FIG. 3, the feed case 17 is supported so as to be able to roll around the front and rear axis P <b> 1 at the rear lower part of the link mechanism 3 (the seedling planting device 5 is the rear part of the link mechanism 3. It is supported so as to be able to roll around the lower front and rear axis P1). As shown in FIGS. 3 and 8, the tilt sensor 48 is fixed to the feed case 17, and the tilt angle in the left-right direction of the seedling planting device 5 with respect to the horizontal plane (field G) is detected by the tilt sensor 48. The detection value of the sensor 48 is input to the control device 40.

  As shown in FIG. 3, a rolling mechanism 46 is provided at the upper rear portion of the link mechanism 3. The rolling mechanism 46 is a pair of wires 46a that are pushed and pulled in the left-right direction, and a gear mechanism that pushes and pulls the wires 46a. (Not shown) and an electric motor 46b. A bracket 27 a is fixed to the right and left ends of the guide rail 27, and a spring 47 is connected between the arm 46 c fixed to the rolling mechanism 46 and the bracket 27 a of the guide rail 27. A spring 39 is connected across the wire 46 a and the right and left side portions of the support member 50.

  As a result, as shown in the preceding item [1] and FIG. 3, when the seedling setting table 10 is laterally driven to the right (left), the right (left) spring 47 is extended to the right (left). The inclination of the seedling planting device 5 to the right (left) is suppressed by the biasing force of the spring 47.

Next, the operation of the rolling control means 76 of the seedling planting device 5 will be described.
The inclination angle in the left-right direction of the seedling planting device 5 with respect to the horizontal plane (field surface G) is detected by the inclination sensor 48, and the difference between the detection value of the horizontal plane (field surface G) and the inclination sensor 48 is detected.
When the seedling planting device 5 is displaced from the horizontal plane (field G) to the right side, the electric motor 46b of the rolling mechanism 46 operates, and the wire 46a of the rolling mechanism 46 is pushed and pulled to drive the seedling planting device 5. Rolls to the left.

When the seedling planting device 5 is displaced from the horizontal plane (field G) to the left inclined side, the electric motor 46b of the rolling mechanism 46 is operated, and the wire 46a of the rolling mechanism 46 is pushed and pulled to drive the seedling planting device 5. Rolls to the right.
When the seedling planting device 5 has the same inclination angle as the horizontal plane (field G), the rolling of the seedling planting device 5 stops.
As described above, the seedling planting device 5 is maintained horizontally (maintained parallel to the rice field G in the left-right direction).

[10]
Next, the structure of the leveling control means 85 of the leveling device 53 will be described.
As shown in FIGS. 2, 3, and 4, a support case 92 is fixed at a concentric position with the drive shaft 61 on the left lateral outer side of the transmission case 81 and the right lateral outer side of the support arm 83. The operating shaft 92a is rotatably supported concentrically with the drive shaft 61 and extends laterally outward.

  As shown in FIGS. 2, 3, and 4, a boss portion 93 is fixed to the operation shaft 92a of the support case 92, and a flat and sled-shaped grounding body 94 having a predetermined lateral width (for the second height sensor). Is attached to the boss 83 and extends obliquely rearward and downward. By changing the mounting position of the grounding body 94 with respect to the boss portion 83, the position of the grounding body 94 can be finely adjusted in the left-right direction (axial direction of the drive shaft 61), or finely adjusted in the front-rear direction. .

  As shown in FIGS. 2, 3, and 4, a waterproof potentiometer 95 (corresponding to a second height sensor) is fixed to the rear portion of the support case 92, and the angle of the operation shaft 92 a of the support case 92 is detected by the potentiometer 95. As shown, the potentiometer 95 and the operation shaft 92 a of the support case 92 are connected inside the support case 92. The grounding body 94 is urged downward by a spring (not shown) attached to the operation shaft 92a of the support case 92 inside the support case 92 so as to follow the ground surface G.

  As shown in FIG. 8, detection values of the right and left potentiometers 95 are input to the control device 40. As a result, the grounding body 94 follows the ground surface G so that the height from the surface G to the leveling device 53 (drive shaft 61) is increased by the grounding body 94 and the potentiometer 95 on the surface G below the leveling device 53. Can be detected. In this case, the intermediate value (average value) of the detection values of the right and left potentiometers 95 is detected as the height from the surface G to the leveling device 53 (drive shaft 61).

  As shown in FIG. 8, an artificially operable dial-type leveling setting switch 84 is provided, and an operation position of the leveling setting switch 84 is input to the control device 40, and the leveling setting switch 84 is operated. Thus, the leveling set height A2 (leveling depth) that is the height from the surface G to the leveling device 53 (drive shaft 61) can be arbitrarily set. In this case, with the work position A4 as the central position, the leveling set height A2 (leveling depth) is arbitrarily set and set in a predetermined range above (on the side where the leveling depth is shallow) and below (on the side where the leveling level is deep) Can be changed.

[11]
Next, the operation of the leveling control means 85 of the leveling device 53 will be described.
As shown in FIGS. 2 and 8, the grounding body 94 follows the ground surface G while the ground leveling device 53 moves up and down, and accordingly, from the surface G to the leveling device 53 (drive shaft 61). The height is about to change. Thereby, the height from the surface G to the leveling device 53 (drive shaft 61) is detected by the potentiometer 95 (intermediate value (average value) of the detection values of the right and left potentiometers 95), and the leveling set height A2 ( The difference between the leveling depth) and the detection value of the potentiometer 95 (the intermediate value (average value) of the detection values of the right and left potentiometers 95) is detected.

  This eliminates the difference between the leveling set height A2 (leveling depth) and the detected value of the potentiometer 95 (the intermediate value (average value) of the detected values of the right and left potentiometers 95), and the detected value of the potentiometer 95 ( The electric motor 56 operates to raise and lower the leveling device 53 so that the intermediate value (average value) of the detected values of the right and left potentiometers 95 becomes the leveling set height A2 (leveling depth). The leveling depth 53 is maintained at the leveling height A2 (leveling depth).

  In this case, when the leveling device 53 is temporarily greatly lowered (the leveling set height A2 (leveling depth)) and the detection value of the potentiometer 95 (intermediate value (average value) of the detection values of the right and left potentiometers 95). When the difference between the two is temporarily very small), it is assumed that the leveling device 53 has greatly sunk into the field G.

  As described above, when the leveling device 53 is temporarily greatly lowered, the leveling device 53 is driven while rotating the rotating body 62 to a height (or retreat position A3) exceeding the leveling set height A2 (leveling depth). The leveling control means 85 is operated so that the leveling device 53 is lowered to the leveling set height A2 (leveling depth) after the mud is removed from the rotating body 62.

  As shown in FIG. 8, when the leveling setting height A2 (leveling depth) is set by the leveling setting switch 84, if the sensitivity setting switch 70 is operated to the neutral position N, the leveling setting switch 84 The set leveling height A2 (leveling depth) is maintained.

  As shown in FIG. 8, when the sensitivity setting switch 70 is operated to the sensitive side in the state where the leveling set height A2 (leveling depth) is set by the leveling setting switch 84, the setting is performed as described in [8] above. In addition to the detection value B1 (set height A1 (set depth)) being slightly changed to the lower side and setting the raising / lowering of the seedling planting device 5 by the hydraulic cylinder 4 to be sensitive, the leveling set height A2 (leveling depth) is slightly changed to a higher side (state where the leveling depth of the leveling device 53 becomes shallow).

  As shown in FIG. 8, when the sensitivity setting switch 70 is operated to the insensitive side in a state where the leveling set height A2 (leveling depth) is set by the leveling setting switch 84, the setting is performed as described in [8] above. In addition to the detection value B1 (set height A1 (set depth)) being changed to a slightly higher side and the raising / lowering of the seedling planting device 5 by the hydraulic cylinder 4 being set to be insensitive, the leveling set height A2 (leveling depth) is slightly changed to the low side (state where the leveling depth of the leveling device 53 becomes deep).

[First Alternative Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], the disk member 96 as shown in FIGS. 9A and 9B is attached to the rotating body 62 adjacent to the inside of the transmission case 81 and the support arm 83. May be.
As shown in FIGS. 9A and 9B, the disk member 96 includes a central opening 96a through which the drive shaft 61 passes, three drain holes 96b, an outer wall portion 96c rising from the entire periphery of the outer peripheral portion, and an opening 96a. A wall portion 96d that rises from three locations on the outer peripheral portion and a wall portion 96e that rises from the entire periphery of the outer peripheral portion of the drain hole 96b are integrally formed of synthetic resin.

  As shown in FIG. 9A, when the disc member 96 is attached to the rotating body 62 adjacent to the inside of the transmission case 81 and the support arm 83, the boss portion of the transmission case 81 (support arm 83) becomes the disc member. It will be in the state which enters between 96 wall part 96d. Thereby, it is possible to prevent the winding of the drive shaft 61 between the transmission case 81 and the support arm 83 and the rotating body 62.

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment], as shown in FIG. 3 and FIG. Instead of forming a gap therebetween, as shown in FIG. 10, the rotating body 62 </ b> A positioned behind the rear wheel 2 in the leveling device 53 may be configured to have a smaller diameter than the other rotating bodies 62.

[Third Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] [Second Alternative Embodiment of the Invention], the rotating body 62 shown in FIG. The leveling device 53 may be configured using the rotating body 99 shown in FIG.

As shown in FIG. 11, as shown in FIG. 12, a disk member 97 having a central square hole 97 a and twelve mounting holes 97 b on the outer peripheral portion, and six vertically long ground leveling plates 98 as a set, Six ground leveling plates 98 are attached to the mounting holes 97b of the disk member 97, and one rotating body 99 is configured. In this way, a plurality of rotating bodies 99 are prepared.
Next, as shown in FIG. 12, the end portion of the leveling plate 98 of one rotating body 99 is attached to the mounting hole 97 b where the leveling plate 98 is not attached in the disk member 97 of another rotating body 99. In this way, the leveling device 53 (leveling rotor) is configured by connecting a plurality of rotating bodies 99.

[Fourth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] to [Third Alternative Embodiment of the Invention], the right and left grounding bodies 94 and the potentiometer 95 are not provided. Alternatively, the grounding body 94 and the potentiometer 95 may be provided on one of the right and left sides (one of the transmission case 81 and the support arm 83).

[Fifth Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment of the Invention] to [Fourth Alternative Embodiment of the Invention], the leveling device 53 is a ground working device (seedling planting device 5). The ground leveling device 53 may be supported by a link mechanism (not shown) extended from the rear part of the machine body.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a paddy field work machine provided with a seedling planting device, a fertilizer application device that supplies paste-like fertilizer to the rice field, a direct sowing device, a chemical spraying device, a rice bran spraying device, and the like as a ground work device.

2 Wheel 4 First lifting mechanism 5 Ground working device 9, 68 First height sensor 53 Leveling device 56 Second lifting mechanism 57 Bearing portion 61 Drive shaft 62 Rotating body 62A Rotating body 62a Rotating body boss Portion 62d Outer peripheral portion of rotating body 73 First control means 85 Second control means 94 Second height sensor, grounding body 95 Second height sensor G surface W1 Horizontal width of outer peripheral portion of rotating body W2 Boss of rotating body Horizontal width of the part

Claims (6)

Support the ground working device at the rear of the aircraft
The ground work device is configured to drive the ground work device up and down, a first height sensor that detects a height of the ground work device with respect to a field surface, and the ground work device based on a detection value of the first height sensor. First control means for operating the first lifting mechanism so as to be maintained at a set height from the surface,
A leveling device for leveling the field surface is supported on the front side of the ground work device so as to be movable up and down,
A second elevating mechanism that drives the leveling device to move up and down, a second height sensor that detects the height of the leveling device with respect to the field, and the leveling device set from the surface based on the detection value of the second height sensor. The paddy field work machine provided with the 2nd control means which operates the 2nd raising / lowering mechanism so that it may be maintained at height.   2. The paddy field work machine according to claim 1, wherein the second height sensor is constituted by a sled-shaped grounding body that moves up and down so as to follow the field while grounding the field.   The said leveling apparatus is comprised by the wide leveling rotor rotated about the left-right axis center, The said 2nd height sensor is provided in the right or left edge part of the said leveling rotor. Paddy field machine. The leveling rotor includes a drive shaft that is arranged in the left-right direction and is rotationally driven, and a plurality of small-sized rotating bodies that are attached to the drive shaft so as to be aligned along the axial direction of the drive shaft. ,
The adjacent rotations by setting the lateral width of the boss portion of the rotating body fitted on the drive shaft to be smaller than the lateral width of the outer peripheral portion which is a leveling portion of the rotating body. The paddy field work machine according to claim 3, wherein the rotating body is attached to the drive shaft so that a gap is formed between boss portions of the body.   The bearing part which supports the said drive shaft rotatably is arrange | positioned between the boss | hub parts of the said adjacent rotary body, The outer peripheral part of the said rotary body is comprised so that the said bearing part may be covered. Paddy field work machine as described in.   The paddy field work machine according to claim 4 or 5, wherein the rotary body located behind the wheels of the machine body is configured to have a smaller diameter than the other rotary bodies.

Images