JP2020130073A - Paddy work machine - Google Patents

Abstract

To improve ground leveling performance of a ground leveling device, in a paddy work machine with the ground leveling device.SOLUTION: A ground leveling device 23 arranged between a working device supported by the rear of a machine body and a rear wheel of the machine body in side view comprises a drive shaft 48 supported along the left and right directions in a rotationally drivable manner. A plurality of ground leveling bodies 53 are provided that are mounted to the drive shaft 48 so as to be arranged along the longitudinal direction of drive shaft 48, and level the surface of a paddy field by being rotationally driven integrally with the drive shaft 48. Spacers 67, 68 are included that are rotatably mounted integrally with the drive shaft 48 in a predetermined longitudinal position of the drive shaft 48, determine the position of the ground leveling body 53 at the drive shaft 48, and are formed with uneven ground leveling units 67a, 67b in an outer surface.SELECTED DRAWING: Figure 6

Description

According to the present invention, paddy field work such as a riding type rice transplanter or a riding type direct sowing machine provided with a ground leveling device for leveling the rice field surface between a work device supported at the rear part of the machine body and a rear wheel of the machine body in a side view. Regarding the machine.

As the paddy field working machine as described above, there is a paddy field working machine equipped with a ground leveling device as disclosed in Patent Document 1.
In the ground leveling device of Patent Document 1, a plurality of ground leveling bodies are attached to a drive shaft supported so as to be rotationally driveable along the left-right direction so as to line up along the longitudinal direction of the drive shaft, and drive in the ground leveling body. A spacer for determining the position of the shaft in the longitudinal direction is attached to the drive shaft.
In a state where the positions of the drive shafts in the longitudinal direction in the plurality of ground leveling bodies are determined by the spacers, the ground leveling bodies are rotationally driven integrally with the drive shafts, and the ground surface is leveled by the leveling bodies.

Japanese Unexamined Patent Publication No. 2015-62352

In paddy field work machines equipped with a leveling device, there is a demand for further improvement in the leveling performance of the leveling device.
An object of the present invention is to improve the leveling performance of a land leveling device in a paddy field working machine equipped with a ground leveling device, and an object of the present invention is to reduce the size of the ground leveling device from the viewpoint of reducing the weight of the entire paddy field working machine.

The paddy field work machine of the present invention is provided with a ground leveling device that is arranged between a work device supported at the rear part of the machine body and the rear wheel of the machine body to level the ground surface in a side view. A drive shaft that is supported so as to be rotationally driveable along the left-right direction and a drive shaft that is attached to the drive shaft so as to line up along the longitudinal direction of the drive shaft, and is rotationally driven integrally with the drive shaft to provide a surface surface. A plurality of ground leveling bodies to be leveled are rotatably attached to a predetermined position in the longitudinal direction of the drive shaft integrally with the drive shaft to determine the position of the ground leveling body on the drive shaft, and the outer surface is uneven. A spacer on which the ground leveling portion of the above is formed is provided.

According to the present invention, in the ground leveling device, a plurality of ground leveling bodies are rotationally driven integrally with the drive shaft in a state where the position of the leveling body on the drive shaft is determined by the spacer, and as the machine moves forward. , The land surface is leveled by the ground leveling body.

According to the present invention, the spacer is rotationally driven integrally with the drive shaft, and an uneven ground leveling portion is formed on the outer surface of the spacer. As a result, when the relatively high mountain-shaped mud on the field surface comes to the position of the spacer due to the advance of the aircraft, the spacer is rotationally driven and the ground leveling portion is formed on the outer surface of the spacer. It can be expected that the spacers will properly break down the relatively high mountainous mud on the rice field.
According to the present invention, in the ground leveling device, in addition to the ground leveling function of the field surface by the ground leveling body, the ground leveling function by the spacer is also provided, and the ground leveling performance can be improved.

In the present invention, it is preferable that the spacer has a smaller diameter than the ground leveling body and a larger diameter than the drive shaft.

In the ground leveling device, when the aircraft moves forward with the ground leveling body in contact with the ground surface, the mud on the field surface is pushed forward by the ground leveling body even if the ground leveling body is rotationally driven, and the ground leveling device is pushed outward from the right end and the left end. May flow to. Such a phenomenon is generally called a mud pushing phenomenon.

According to the present invention, since the spacer has a smaller diameter than the ground leveling body, the mud on the paddy surface is less likely to be pushed by the spacer portion in the ground leveling device, and the mud on the paddy surface flows from the spacer portion in the ground leveling device to the rear side. Since it is easy, it is preferable in that the above-mentioned mud pushing phenomenon is suppressed.

In the present invention, it is preferable that the spacer is arranged at a position rearward of the rear wheel in a plan view.

In the paddy field work machine, the rear wheels are relatively large, and the ground leveling device and the rear wheels approach each other in the front-rear direction. Therefore, as in the present invention, a spacer having a diameter smaller than that of the ground leveling body is located on the rear side of the rear wheels. By arranging at the position of, the interference between the ground leveling device and the rear wheels can be reasonably avoided.

In paddy field work machines, relatively high mountain-shaped mud is likely to be formed on the running traces of the rear wheels. Therefore, as in the present invention, the spacers are arranged at positions rearward of the rear wheels, so that the spacers can be used. The function of breaking down the relatively high mountainous mud on the rice field is demonstrated without waste.

In the present invention, it is preferable that the spacer is arranged at a position below the transmission shaft that transmits power to the working device in front view.

In a paddy field work machine, a transmission shaft that transmits power to the work equipment may be arranged above the ground leveling device, and the ground leveling device and the transmission shaft may intersect in a front view and a plan view. is there. If the work device is moved up and down in this state, the ground leveling device and the transmission shaft may approach each other in the vertical direction.
According to the present invention, by arranging the spacer having a diameter smaller than that of the ground leveling body at a position lower than the transmission shaft, interference between the ground leveling device and the transmission shaft can be reasonably avoided.

In the present invention, it is preferable that the width of the spacer is set to be larger than the width of the ground leveling body.

According to the present invention, since the width of the spacer is set to be larger than the width of the ground leveling body, it is advantageous in that the mud on the field surface is less likely to be pushed by the spacer portion in the leveling device. This is advantageous in that the mud can easily flow from the spacer portion of the ground leveling device to the rear side, and is therefore effective in suppressing the above-mentioned mud pushing phenomenon.

In the present invention, a cover is provided which is arranged behind the ground leveling body in a side view and is arranged along the longitudinal direction of the drive shaft to prevent muddy water from scattering from the ground leveling body to the working device. It is preferable that a support member for supporting the right and left portions of the cover and the intermediate portion between the right and left portions of the cover is provided.

In the ground leveling device, when the ground leveling body is rotationally driven, muddy water on the field surface may scatter to the work device on the rear side, so a cover may be provided to prevent the muddy water from scattering from the ground leveling body to the work device. .. The cover is arranged on the rear side of the ground leveling body and is arranged along the longitudinal direction of the drive shaft, and has a large width.

According to the present invention, in addition to the support member that supports the right and left portions of the cover, the support member that supports the intermediate portion between the right and left portions of the cover is provided, so that the cover has a large width. However, the displacement of the cover can be suppressed and the cover can be stably supported.

In the present invention, the working device is a seedling planting device for planting seedlings on a rice field surface, is supported by a hydraulic cylinder so as to be able to move up and down to the rear portion of the machine body, and is vertically supported around the support axis in the left-right direction of the seedling planting device. The hydraulic cylinder is operated so that the seedling planting device is maintained at a set height from the rice field surface based on the float that is swingably supported and follows the ground surface and the swing of the float. As a result, a planting elevating control unit is provided so that the seedling planting depth by the seedling planting device is maintained at the set planting depth, and the position of the support shaft core in the seedling planting device Is provided with a planting depth setting unit for changing the set height to set the set planting depth by changing the height up and down, and a ground leveling mechanism capable of raising and lowering the ground leveling device. In a state where the set height is set to the lowest state by the planting depth setting unit and the ground leveling device is lifted and lowered to a height at which the ground leveling body comes into contact with the rice field surface by the ground leveling elevating mechanism. It is preferable that the axis of rotation of the drive shaft is located below the virtual line extending parallel to the field surface from the support axis.

According to the present invention, in a paddy field working machine, when the working device is a seedling planting device for planting seedlings on the rice field surface, the seedling planting device is supported by a hydraulic cylinder so as to be able to move up and down to the rear part of the machine body. A float that follows the ground surface of the seedling planting device is supported so that it can swing up and down around the support axis in the left-right direction of the seedling planting device. Based on the swinging of the float, the seedling planting device sets the height from the rice field surface. A planting lift control unit for operating the hydraulic cylinder is provided so as to be maintained at.

By maintaining the seedling planting device at the set height from the field surface, the seedling planting depth by the seedling planting device is maintained at the set planting depth. In this case, the planting depth setting unit can change the set height and set (change) the set planting depth by changing the position of the support shaft core in the seedling planting device up and down. it can.

According to the present invention, since the ground leveling mechanism for raising and lowering the ground leveling device is provided, the ground leveling is carried out as the set height (set planting depth) is changed by the planting depth setting unit. By raising and lowering the device, it is possible to set the leveling state of the field surface by the leveling device to an appropriate state.

According to the present invention in the above-described configuration, the set height is set to the lowest state by the planting depth setting unit, and the leveling device is raised and lowered to a height at which the leveling body comes into contact with the field surface by the leveling lifting mechanism. In this state, the axis of rotation of the drive shaft of the leveling device is located below the virtual line extending parallel to the field surface from the support axis of the float.

As described above, the axis of rotation of the drive shaft of the leveling device is located below the virtual line set at a low position, and the leveling body is configured to have a relatively small diameter in the leveling device. Therefore, it is possible to reduce the size of the ground leveling device, and accordingly, it is possible to reduce the weight of the paddy field work machine as a whole.

In the present invention, a square hole is opened through the ground leveling body in the left-right direction, and a convex portion that enters the corner portion on the inner surface of the square hole is formed on the drive shaft along the longitudinal direction of the drive shaft. It is preferable that the ground leveling body is integrally rotatably attached to the drive shaft by being formed on the outer surface and having the convex portion enter the corner portion.

When the ground leveling body is configured to be rotationally driven integrally with the drive shaft, according to the present invention, a square hole is opened in the ground leveling body, and a convex portion along the longitudinal direction of the drive shaft is formed on the outer surface of the drive shaft. ing.

According to the present invention, the convex portion of the drive shaft is attached to the drive shaft so that the ground leveling body is rotationally driven integrally with the drive shaft by entering the corner portion of the square hole of the ground leveling body. The rotational drive is transmitted to the leveling body without waste by the engagement between the convex portion and the corner portion.

It is a left side view of a passenger-type rice transplanter. It is a left side view near the seedling planting device and the ground leveling device. It is a front view of the seedling planting device and the ground leveling device. It is a schematic plan view of a seedling planting device and a ground leveling device. It is a left side view near the float. It is an exploded perspective view of the ground leveling apparatus. It is a left side view of a ground leveling body and a partition member of a ground leveling device. It is sectional drawing of the drive shaft and spacer of a ground leveling apparatus. It is a perspective view of the vicinity of the electric motor which raises and lowers a ground leveling apparatus. It is an exploded perspective view of the vicinity of an electric motor that raises and lowers the ground leveling device. It is a schematic diagram which shows the linkage state of a control device and each part. It is sectional drawing of the drive shaft of the ground leveling apparatus and the ground leveling body in 1st alternative embodiment of the invention. It is sectional drawing of the drive shaft of the ground leveling apparatus, and the ground leveling body in the 2nd alternative embodiment of the invention.

1 to 13 show a passenger-type rice transplanter which is an example of a paddy field working machine. In FIGS. 1 to 13, F indicates a forward direction, B indicates a backward direction, and U indicates an upward direction. , D indicates a downward direction, R indicates a right direction, and L indicates a left direction.

(Overall configuration of passenger rice transplanter)
As shown in FIG. 1, in a passenger-type rice transplanter, a link mechanism 4 is supported so as to be swingable up and down at the rear portion of an airframe 3 provided with right and left front wheels 1 and right and left rear wheels 2. A hydraulic cylinder 5 that extends to the rear side and raises and lowers the link mechanism 4 is provided.

The seedling planting device 6 (corresponding to a working device) is supported by the rear part of the link mechanism 4, and the seedling planting device 6 is supported by the rear part of the machine body 3. The hydraulic cylinder 5 swings the link mechanism 4 up and down to move the seedling planting device 6 up and down.

A ground leveling device 23 for leveling the rice field surface G is supported at the lower part on the front side of the seedling planting device 6, and the ground leveling device 23 is arranged between the seedling planting device 6 and the rear wheel 2 in a side view. There is. A fertilizer application device 7 for supplying fertilizer to the rice field G is provided over the rear part of the machine body 3 and the seedling planting device 6.

(Overall configuration of seedling planting device)
As shown in FIGS. 1, 2 and 4, the seedling planting device 6 includes a support frame 8, a feed case 14, a planting transmission case 9, a rotating case 10, a planting arm 11, a float 12, a seedling stand 13, and the like. It is provided.

The support frame 8 is manufactured by an aluminum drawing method and has a trapezoidal cross-sectional shape (see FIG. 5). The support frame 8 is arranged along the left-right direction, the feed case 14 is connected to the left-right center portion of the support frame 8, and the two planting transmission cases 9 are connected to the right portion and the left portion of the support frame 8. It is extended to the rear side.

The rotary case 10 is rotatably supported on the right and left portions of the rear portion of the planting transmission case 9, and the planting arms 11 are supported on both ends of the rotary case 10. The seedling stand 13 is supported so as to be reciprocally movable in the left-right direction.

The feed case 14 is rotatably supported around the lower front-rear axial core P1 of the rear portion of the link mechanism 4, and the entire seedling planting device 6 is rotatably supported around the axial core P1.

The power of the engine (not shown) is transmitted from the planting clutch (not shown) to the internal transmission mechanism (not shown) of the feed case 14 via the transmission shaft 35, and is provided in the feed case 14. The seedling stand 13 is driven to reciprocate laterally in the left-right direction with a predetermined stroke by the lateral feed shaft (not shown).

As shown in FIG. 4, the power transmitted to the transmission mechanism of the feed case 14 is transmitted to the transmission case via the transmission shaft 36, the torque limiter 37 inside the planting transmission case 9, the transmission chain 38, and the minority clutch 39. It is transmitted to 10. As the seedling stand 13 is driven to reciprocate and laterally feed in the left-right direction, the rotary case 10 is rotationally driven, and the planting arm 11 alternately takes out seedlings from the lower part of the seedling stand 13 and plants them on the rice field G.

(Overall configuration of fertilizer application device)
As shown in FIGS. 1, 2 and 4, the fertilizer application device 7 is provided with a hopper 15, a feeding portion 16, a blower 17, a groove making device 18, a hose 19 and the like.

A hopper 15 for storing fertilizer and a feeding portion 16 are supported on the rear portion of the driver's seat 20 in the machine body 3, and a blower 17 is provided on the left lateral outer portion of the feeding portion 16. A grooving device 18 is attached to the float 12, four grooving devices 18 are provided, and four hoses 19 are connected to the feeding portion 16 and the grooving device 18.

The power of the engine (not shown) is transmitted to the feeding portion 16 via the fertilizer application clutch (not shown), the fertilizer of the hopper 15 is fed by the feeding portion 16, and is passed through the hose 19 by the transport wind of the blower 17. It is supplied to the groove making device 18. Fertilizer is supplied from the groove making device 18 to the groove of the field surface G while the groove is formed on the rice field surface G by the groove making device 18.

(Float support structure for seedling planting equipment)
As shown in FIGS. 2, 4 and 5, the two floats 12 are located behind the right and left rear wheels 2 in a plan view and below the planting transmission case 9 in a side view. Is located in.

A bracket 27 is connected to the rear portion of the support frame 8. The float pipe 28 is arranged below the planting transmission case 9 along the left-right direction, and is rotatably supported by the bracket 27 around the axis P2 in the left-right direction. The support arm 28a connected to the float pipe 28 extends to the rear side, and the rear portion of the float 12 is swingably supported up and down around the support shaft core P3 in the left-right direction of the rear portion of the support arm 28a. There is.

The planting depth lever 29 (corresponding to the planting depth setting portion) is connected to the float pipe 28 and extends diagonally from the float pipe 28 to the upper side on the front side. A lever guide 30 is connected to the right portion of the feed case 14, and a planting depth lever 29 is inserted into the lever guide 30.

By operating the planting depth lever 29 up and down, the support arm 28a of the float pipe 28 can be operated up and down to change the position of the support shaft core P3 (rear part of the float 12) up and down. By engaging the planting depth lever 29 with the lever guide 30, the position of the support shaft core P3 (rear part of the float 12) can be fixed.

The frame 31 is connected to the front portions of the two floats 12, and the two floats 12 integrally swing up and down around the support shaft core P3.
The bracket 32 is connected to the left and right center portions of the frame 31 and extends to the rear side, the rake-shaped ground leveling member 33 is connected to the rear portion of the bracket 32, and the ground leveling member 33 is the left and right center of the seedling planting device 6. It is placed in the department.

(Structure related to elevating control of seedling planting device)
As shown in FIGS. 3, 4 and 5, the channel-shaped detection unit 40 is swingably supported around the left-right axial core P4 of the bracket 31a connected to the left portion of the frame 31 in front view. It passes between the support frame 8 and the ground leveling device 23 and extends upward.

A connecting member 41 formed by bending a round bar member is provided. The bracket 42 is connected to the upper part of the support frame 8, and the intermediate portion of the connecting member 41 is swingably supported around the axial core P5 in the left-right direction of the bracket 42.

An elongated hole 40a along the vertical direction is opened in the detection unit 40, and one end 41a of the connecting member 41 is inserted into the elongated hole 40a of the detection unit 40. The operation arm 34 is connected to the float pipe 28 and extends upward, a long hole 34a is opened in the operation arm 34, and the other end 41b of the connecting member 41 is inserted into the long hole 34a of the operation arm 34. Has been done.

As shown in FIG. 11, a control valve 65 for supplying / discharging hydraulic oil to the hydraulic cylinder 5 is provided in the machine body 3. The control valve 65 supplies hydraulic oil to the hydraulic cylinder 5 to raise the hydraulic cylinder 5 (contraction operation), discharges the hydraulic oil from the hydraulic cylinder 5 to lower the hydraulic cylinder 5 (extension operation). It can be operated in the lowered position and the neutral position where the hydraulic cylinder 5 is stopped.

A spool 65a that can be slid in the left-right direction in FIG. 11 is provided on the control valve 65, and the spool 65a of the control valve 65 is urged to a lower position by a spring (not shown). A swingable operation arm 66 is provided, and the operation arm 66 can push the spool 65a of the control valve 65 toward the ascending position side.

As shown in FIGS. 3, 5 and 11, one end of the inner 43a of the wire 43 is connected to the operating arm 66. At the other end of the wire 43, the inner 43a of the wire 43 is connected to the end 41a of the connecting member 41, and the outer 43b of the wire 43 is connected to the top of the detection unit 40.

As described in the above (support structure of the float of the seedling planting device), the planting depth lever 29 is engaged with the lever guide 30, and the position of the support shaft core P3 (rear part of the float 12) is fixed. If so, the posture of the connecting member 41 is also fixed by the operation arm 34.

(Operating state of elevating control of seedling planting device)
As shown in FIGS. 5 and 11, the float 12 follows the rice field surface G on the ground as the aircraft 3 advances, and when the seedling planting device 6 moves up and down with respect to the rice field surface G (float 12), seedlings are planted. The float 12 swings up and down around the support shaft core P3 with respect to the attachment device 6, and the detection unit 40 moves up and down with respect to the seedling planting device 6 (connecting member 41). The states shown in FIGS. 5 and 11 are states in which the spool 65a of the control valve 65 is operated to the neutral position and the hydraulic cylinder 5 is stopped.

When the seedling planting device 6 descends from the state shown in FIGS. 5 and 11 and approaches the rice field surface G, the float 12 rises with respect to the seedling planting device 6, and the detection unit 40 with respect to the connecting member 41. In the ascending state, the inner 43a of the wire 43 is pulled toward the seedling planting device 6.
As a result, the spool 65a of the control valve 65 is pushed to the ascending position by the operating arm 66, the hydraulic cylinder 5 is ascended, and the seedling planting device 6 is ascended.

When the seedling planting device 6 rises from the state shown in FIGS. 5 and 11 and moves away from the field surface G, the float 12 falls with respect to the seedling planting device 6, and the detection unit 40 with respect to the connecting member 41. In the descending state, the inner 43a of the wire 43 is pushed toward the operation arm 66.
As a result, the operation arm 66 is separated from the spool 65a of the control valve 65, the spool 65a of the control valve 65 is moved to the lowering position, the hydraulic cylinder 5 is lowered, and the seedling planting device 6 is lowered.

As described above, the vertical position of the float 12 with respect to the seedling planting device 6 is transmitted to the operation arm 66 by the detection unit 40 via the wire 43, and the spool 65a of the control valve 65 is operated. When the positional relationship between the upper part of the detection unit 40 and the end portion 41a of the connecting member 41 (the length of the inner 43a protruding from the outer 43b of the wire 43) returns to the state shown in FIG. 5, the operation arm 66 causes the control valve 65 to move. The spool 65a is pushed to the neutral position and the hydraulic cylinder 5 is stopped.

As a result, the control valve is maintained so that the positional relationship between the upper portion of the detection unit 40 and the end portion 41a of the connecting member 41 (the length of the inner 43a protruding from the outer 43b of the wire 43) is maintained in the state shown in FIG. The spool 65a of 65 is operated, the seedling planting device 6 is automatically raised and lowered, and the seedling planting device 6 is maintained from the field surface G to the set height H1 shown in FIG. The planting depth of the seedlings by 6 (planting arm 11) is maintained at the set planting depth.

As shown in FIG. 11, the seedling planting device 6 is operated by operating the hydraulic cylinder 5 so that the seedling planting device 6 is maintained at the set height H1 from the field surface G based on the swing of the float 12. The planting elevating control unit 83 is provided so that the planting depth of the seedlings is maintained at the set planting depth. The planting elevating control unit 83 includes a detection unit 40, a connecting member 41, a wire 43, a control valve 65, an operation arm 66, and the like.

(Change of seedling setting planting depth)
The state shown in FIG. 5 is a state in which the position of the support shaft core P3 (rear part of the float 12) is closest to the seedling planting device 6, and the set height H1 (see FIG. 11) is the lowest state (seedlings). The planting depth is the deepest).

When the planting depth lever 29 is operated from the state shown in FIG. 5 and the position of the support shaft core P3 (rear part of the float 12) with respect to the seedling planting device 6 is changed to the lower side, the set height H1 is changed. As it gets higher, the set planting depth of seedlings becomes shallower.

When the planting depth lever 29 is operated to change the set planting depth of the seedlings, the positions of the float 12 and the detection unit 40 with respect to the seedling planting device 6 change up and down. The connecting member 41 is swung around the shaft core P5 in conjunction with the operation arm 34, and the position of the end portion 41a of the connecting member 41 is changed up and down as described below.

When the set planting depth of the seedling is changed to the deep side (lower side of the set height H1) by the planting depth lever 29 (when the position of the detection unit 40 rises with respect to the seedling planting device 6), Along with this, the position of the inner 43a (end 41a of the connecting member 41) of the wire 43 is also changed to the upper side by the operation arm 34.

When the set planting depth of the seedling is changed to the shallow side (high side of the set height H1) by the planting depth lever 29 (when the position of the detection unit 40 is lowered with respect to the seedling planting device 6), Along with this, the position of the inner 43a (end 41a of the connecting member 41) of the wire 43 is also changed to the lower side by the operation arm 34.

As a result, even if the planting depth lever 29 is operated to change the set planting depth of the seedlings, the positional relationship between the upper portion of the detection unit 40 and the end portion 41a of the connecting member 41 (from the outer 43b of the wire 43). The length of the inner 43a that comes out) is maintained in the state shown in FIG. 5, and as described in the above-mentioned (operating state of the elevating control of the seedling planting device), the seedling planting device 6 is moved from the field surface G. The set height H1 is maintained, and the seedling planting depth by the seedling planting device 6 (planting arm 11) is maintained at the set planting depth.

(Support structure for seedling stand of seedling planting device)
As shown in FIGS. 2, 3 and 4, the support rail 21 is supported along the left-right direction on the upper part of the planting transmission case 9. The lower part of the seedling stand 13 is supported by the support rail 21 so as to be reciprocally movable along the left-right direction, and the seedling stand 13 extends diagonally from the planting transmission case 9 to the upper side on the front side in a side view. ing.

The support frame 22 is connected to the right and left portions of the support frame 8 and extends upward, and the frame 24 is connected to the upper part of the support frame 22. A support rail 25 is connected to the upper part of the seedling rest 13 along the left-right direction, and a roller 26 supported by the upper part of the support frame 22 is inserted into the support rail 25.

As a result, the lower part of the seedling stand 13 is supported by the planting transmission case 9 and the support rail 21 so as to be movable in the left-right direction, and the upper part (support rail 25) of the seedling stand 13 is supported by the support frame 22 and the roller 26. It is supported so as to be movable in the left-right direction, and the seedling rest 13 is driven by reciprocating lateral feed in the left-right direction with a predetermined stroke.

(Configuration related to rolling control of seedling planting device)
As shown in FIGS. 2 and 3, the support member 75 is connected to the rear portion of the link mechanism 4 and extends upward, and the rolling mechanism 76 is connected to the upper portion of the support member 75. The rolling mechanism 76 has an electric motor 77, a pulley (not shown) that is rotationally driven in the forward and reverse directions around the axis in the front-rear direction by the electric motor 77, and is wound around the pulley and extended to the right and left sides from the rolling mechanism 76. Right and left wires 78 are provided.

In the seedling stand 13, the bracket 25a is connected to the right and left portions of the support rail 25. The right spring 79 is connected between the right wire 78 and the right bracket 25a of the support rail 25, and the left spring 79 extends over the left wire 78 and the left bracket 25a of the support rail 25. Is connected.

As shown in FIG. 11, an inclination sensor 80 for detecting the inclination angle of the seedling planting device 6 in the horizontal direction with respect to the horizontal plane is attached to the feed case 14, and the detection value of the inclination sensor 80 is provided on the machine body 3. It is input to the control device 70.

A dial operation type tilt setting switch 81 is provided on the machine body 3, and an operation signal of the tilt setting switch 81 is input to the control device 70. The tilt setting switch 81 sets the set tilt angle, and the set tilt angle can be arbitrarily set from the horizontal position and the horizontal position to the right-down position and the left-down position.

(Operating state of rolling control of seedling planting device)
As shown in FIG. 11, a rolling control unit 71 is provided as software in the control device 70, and the rolling control unit 71 (control device 70) is based on the operation position of the tilt setting switch 81 and the detection value of the tilt sensor 80. As a result, the electric motor 77 of the rolling mechanism 76 is operated as described below.

For example, when the set tilt angle is set to the horizontal position by the tilt setting switch 81, the seedling planting device 6 (detected value of the tilt sensor 80) is in the horizontal position, and the machine body 3 is in the horizontal position in the left-right direction. , The electric motor 77 (wire 78) is stopped in the state shown in FIG.

In the state shown in FIG. 3, as described in the above (overall configuration of the seedling planting device), when the seedling stand 13 is laterally driven to the right, the seedlings of the seedling stand 13 and the seedling stand 13 Due to the weight, the seedling planting device 6 tries to incline from the horizontal position to the right downward posture.

In this case, the right spring 79 is stretched by the lateral feed drive of the seedling stand 13 (support rail 25) to the right, and the seedling planting device 6 descends to the right from the horizontal position by the urging force of the right spring 79. The state of leaning to the posture is prevented, and the seedling planting device 6 is maintained in the horizontal position.

In the state shown in FIG. 3, when the seedling stand 13 is laterally driven to the left, the left spring 79 is stretched, and the seedling planting device 6 is moved by the urging force of the left spring 79 as described above. The state of inclining from the horizontal position to the left downward posture is prevented, and the seedling planting device 6 is maintained in the horizontal position.

In the state shown in FIG. 3, for example, when the machine body 3 is tilted from the horizontal position to the right downward posture, the seedling planting device 6 is also tilted from the horizontal position to the right downward posture.
In this case, based on the detection value of the tilt sensor 80, the electric motor 77 pulls the right wire 78 to the rolling mechanism 76 and pulls the left wire 78 out of the rolling mechanism 76 to operate the right and left springs. The seedling planting device 6 is operated in a horizontal position via 79.

In the state shown in FIG. 3, for example, when the machine body 3 is tilted from the horizontal position to the left downward posture and the seedling planting device 6 is tilted from the horizontal position to the left downward posture, the electric motor 77 is based on the detection value of the tilt sensor 80. The right wire 78 is pulled out from the rolling mechanism 76, the left wire 78 is pulled by the rolling mechanism 76, and the seedling planting device 6 is operated in the horizontal position via the right and left springs 79. To.

When the set tilt angle is changed from the horizontal position to another value by the tilt setting switch 81, the electric motor 77 controls the right and left so that the detection value of the tilt sensor 80 becomes the set tilt angle by the tilt setting switch 81. The wire 78 is pulled and pulled out in the same manner as described above.

(Overall configuration of ground leveling equipment)
As shown in FIGS. 1 to 4, a ground leveling device 23 for leveling the field surface G is supported at the lower part of the front portion of the seedling planting device 6 so as to be located on the front side with respect to the support frame 8.

The support members 44 and 45 are connected to the support member 50 connected to the left end portion and the right end portion of the support frame 8. The transmission case 46 is supported by the support member 44 so as to swing up and down, and the support arm 47 is supported by the support member 45 so as to swing up and down around the same horizontal axis P6 as the transmission shaft 36. ..

A drive shaft 48 is rotatably supported over the front portion of the transmission case 46 and the support arm 47, and a large number of ground leveling bodies 53, a plurality of spacers 67, 68, and a large number of partition members 69 are attached to the drive shaft 48. It is attached.

The power of the transmission shaft 36 is transferred from the transmission shaft 49 erected over the planted transmission case 9 and the transmission case 46 to the drive shaft 48 via the torque limiter 51 inside the transmission case 46 and the transmission chain 52. It is transmitted, and the drive shaft 48 and the ground leveling body 53 are rotationally driven in the counterclockwise direction of FIG. 2, and the ground leveling body 53 performs leveling of the field surface G.

The support member 50 extends forward from the support frame 8 and the cover 55 is connected to the front portion of the support member 50 to prevent muddy water from scattering from the ground leveling body 53 to the seedling planting device 6. The cover 55 is arranged on the rear side of the ground leveling body 53 in a side view, and is arranged along the longitudinal direction of the drive shaft 48.

An opening (not shown) is opened slightly to the left of the center of the left and right sides of the cover 55, and an opening (not shown) is opened to the left side of the center of the left and right sides of the front portion of the support frame 8. Is open. A support member 54 made of synthetic resin is prepared, and the front portion of the support member 54 is fitted into the opening of the cover 55, and the rear portion of the support member 54 is fitted into the opening of the support frame 8.

The right and left portions of the cover 55 are supported by the support member 50, and the intermediate portion between the right and left portions of the cover 55 is supported by the support member 54. In this case, even if the left and right central portions of the cover 55 try to vibrate in the front-rear direction, the support member 54 suppresses the vibration of the cover 55.

(Structure of drive shaft, ground leveling body and partition member in ground leveling device)
As shown in FIGS. 6 and 7, the drive shaft 48 is composed of a square pipe having a square cross section.

The ground leveling body 53 is integrally molded with a synthetic resin, and extends over a short square pipe-shaped boss portion 53a, a plurality of ground leveling portions 53b extending outward from the boss portion 53a, and adjacent ground leveling portions 53b and boss portions 53a. It has a reinforcing flange portion 53c and a convex portion 53d protruding laterally from the right and left portions of the ground leveling portion 53b. A square-shaped square hole 53e having the same shape as the outer surface of the drive shaft 48 is opened through the boss portion 53a of the ground leveling body 53 along the left-right direction.

The partition member 69 has a disk shape integrally molded with synthetic resin, a square square hole 69a having the same shape as the outer surface of the drive shaft 48, a plurality of openings 69b opened on the outer peripheral portion, right and left. It has a ring portion 69c and the like formed between the square hole 69a and the opening 69b on both side portions of the above. The partition member 69 has the same outer diameter as the ground leveling body 53.

(Structure of spacer in leveling device)
As shown in FIGS. 6 and 8, the spacers 67 and 68 are integrally molded with a synthetic resin, and the width W1 of the spacer 67 is only larger than the width W2 of the spacer 68 (see FIG. 3). Have the same structure as each other.

As shown in FIGS. 3 and 6, the width W2 of the spacer 68 is the same as the width W3 of the leveling body 53, and the width W1 of the spacer 67 is larger than the width W3 of the ground leveling body 53 and the width W2 of the spacer 68. It is set to the one. The spacers 67 and 68 are pipe-shaped, have a smaller diameter than the leveling body 53, and have a larger diameter than the drive shaft 48.

The spacers 67 and 68 will be described below based on the spacer 67.
As shown in FIGS. 6 and 8, in the spacer 67, a plurality of convex portions 67a (corresponding to a leveling portion) are formed on the outer surface of the spacer 67 over the entire width along the longitudinal direction of the spacer 67. Between the adjacent convex portions 67a, concave portions 67b (corresponding to the leveling portion) are formed on the outer surface of the spacer 67 over the entire width along the longitudinal direction of the spacer 67.

Eight ribs 67c, 67d are formed on the inner surface of the spacer 67 over the entire width along the longitudinal direction of the spacer 67, the four ribs 67c face each other, and another four ribs 67d They are facing each other.

Between the adjacent ribs 67c, two ribs 67e are formed on the inner surface of the spacer 67 over the entire width along the longitudinal direction of the spacer 67. As shown in FIG. 8, the orientations of the four opposing ribs 67c (two ribs 67e) and the orientations of the other four ribs 67d facing each other are orthogonal to each other in a side view.

(Attachment state of the ground leveling body, spacer and partition member to the drive shaft in the ground leveling device)
As shown in FIGS. 3, 4, 6, 7, and 8, the drive shaft 48 is inserted into the square hole 53e of the ground leveling body 53, the square hole 69a of the partition member 69, and the spacers 67, 68, and the ground leveling body 53 and the partition are formed. Members 69 and spacers 67 and 68 are attached to the drive shaft 48 as described below.

Four sets of leveling bodies 53 are attached to the drive shaft 48. The number of the ground leveling bodies 53 in each set is the same, and the leveling bodies 53 are attached to the drive shaft 48 so as to be arranged along the longitudinal direction of the drive shaft 48.

In the adjacent ground leveling body 53, the position of the leveling body 53 is determined by hitting the convex portion 53d of the ground leveling body 53. Partition members 69 are arranged on the right and left portions of the ground leveling body 53 of each set, and the convex portion 53d of the ground leveling body 53 is inserted into the opening 69b of the partition member 69 (see FIG. 7). The ground leveling body 53 and the partition member 69 are rotationally driven integrally with the drive shaft 48 by fitting the square hole 53e of the ground leveling body 53 and the square hole 69a of the partition member 69 with the outer surface of the drive shaft 48.

Three spacers 67 and 68 are arranged between four sets of leveling bodies 53 (partition members 69). The spacers 67 and 68 enter the inside of the ring portion 69c of the partition member 69 and hit the portion of the partition member 69 on the square hole 69a side with respect to the ring portion 69c, whereby the four sets of ground leveling bodies 53 on the drive shaft 48 ( The position of the partition member 69) is determined.

As shown in FIG. 8, with the drive shaft 48 inserted into the spacers 67 and 68, the ribs 67c of the spacers 67 and 68 hit the two opposite outer surfaces of the four outer surfaces of the drive shaft 48. ing. The ribs 67d of the spacers 67 and 68 are in contact with the other two opposing outer surfaces of the four outer surfaces of the drive shaft 48. By contacting the ribs 67c and 67d of the spacers 67 and 68 with the four outer surfaces of the drive shaft 48, the spacers 67 and 68 are rotationally driven integrally with the drive shaft 48.

As shown in FIG. 4, in the ground leveling device 23, the right and left spacers 68 are arranged at positions rearward of the right and left rear wheels 2 in a plan view, and the right and left rear wheels 2 are arranged. It is located directly behind.

As shown in FIG. 3, the spacer 68 in the center of the left and right is arranged at a position below the transmission shaft 35 and directly below the transmission shaft 35 in front view, and the spacer 68 and the transmission shaft 35 are arranged. Cross in a plan view. As shown in FIGS. 3 and 4, a notch 55a for avoiding interference with the transmission shaft 35 is provided on the cover 55.

(Structure of raising and lowering the ground leveling device)
As shown in FIGS. 3, 9 and 10, the support member 56 of the plate material is connected to the left support frame 22. The support member 56 is pressed, and a triangular pressed portion 56a is projected from the support member 56 to the front side when viewed from the front.

In the posterior portion of the support member 56, a fan-shaped operation gear 57 is swingably supported around the axis P7 in the front-rear direction of the support member 56, and the electric motor 58 and the gear mechanism 59 are supported by the support member 56. It is connected to the rear side. The pinion gear 59a of the gear mechanism 59 enters the press portion 56a of the support member 56 from the rear side and meshes with the operation gear 57.

The linking member 60 is connected to the operation gear 57, and the linking rod 61 is connected to the linking member 60 and the transmission case 46. The linking member 62 is swingably supported around the axial core P8 in the front-rear direction of the right support frame 22, and the linking rod 63 is connected over the linking members 60 and 62, and the linking member 62 and the support arm are connected. The linking rod 64 is connected to 47.

The linking rods 61 and 64 are made of spring steel. The upper portions 61a and 64a of the linking rods 61 and 64 are bent downward in a U shape, and the upper portions 61a and 64a of the linking rods 61 and 64 are inserted into the openings of the linking members 60 and 62 to cooperate with each other. The upper portions 61a and 64a of the rods 61 and 64 are connected to the linking members 60 and 62. The lower portions of the coupling rods 61 and 64 are connected (connected) to the transmission case 46 and the support arm 47 by bolts.

The pinion gear 59a of the gear mechanism 59 is rotationally driven by the electric motor 58 in the forward and reverse directions, and the operation gear 57 is swung in the forward and reverse directions.
When the linking rod 61 is pulled toward the operating gear 57 by the operating gear 57 and pushed toward the right support frame 22 by the linking rod 63, the ground leveling device 23 (transmission case 46 and transmission case 46 and) is operated by the linking rods 61 and 64. The support arm 47) is raised around the shaft core P6.

When the linkage rod 61 is pushed toward the transmission case 46 by the operation gear 57 and the linkage rod 63 is pulled toward the operation gear 57 by the operation gear 57, the ground leveling device 23 (the transmission case 46 and the support arm) is operated by the linkage rods 61 and 64. 47) is lowered around the shaft core P6.

As shown in FIG. 11, a ground leveling mechanism 84 capable of raising and lowering the ground leveling device 23 with respect to the seedling planting device 6 is provided. The ground leveling elevating mechanism 84 includes an operation gear 57, an electric motor 58, a gear mechanism 59, linking members 60, 62, linking rods 61, 63, 64 and the like.

(Height control of ground leveling device)
As shown in FIG. 11, a dial-operated type ground leveling switch 73 is provided on the machine body 3, and an operation signal of the ground leveling switch 73 is input to the control device 70. The ground leveling switch 73 is provided with a work position and a storage position, and the set ground leveling depth of the ground leveling device 23 is arbitrarily set by the ground leveling switch 73 within the range of the work position.

The height sensor 74 is connected to the portion of the shaft core P7 in the operation gear 57 (see FIGS. 9 and 10), and the height sensor 74 detects the vertical position of the ground leveling device 23 with respect to the seedling planting device 6. , The detected value of the height sensor 74 is input to the control device 70.

The position sensor 82 is attached to the support frame 8 (see FIG. 5), and the operation arm 34 is connected to the position sensor 82. The position sensor 82 detects the angle of the float pipe 28, in other words, the operating position of the planting depth lever 29, and the detected value of the position sensor 82 is input to the control device 70.

The ground leveling control unit 72 is provided in the control device 70 as software, and is electrically operated by the ground leveling control unit 72 (control device 70) based on the detection values of the operation position, height sensor 74, and position sensor 82 of the ground leveling switch 73. The motor 58 is operated as described below.

When the operation position of the planting depth lever 29 is detected by the position sensor 82, the set height H1 (set planting depth of seedlings) (see (change of set planting depth of seedlings) described above). Detected. Based on the set height H1 (set planting depth of seedlings) and the detected value of the height sensor 74 (upper and lower positions of the ground leveling device 23 with respect to the seedling planting device 6), the height of the ground leveling device 23 from the field surface G. Is detected, and the leveling depth H2 of the leveling device 23 is detected.

As a result, the electric motor 58 is operated so that the leveling depth H2 of the leveling device 23 becomes the set leveling depth of the leveling switch 73, and the leveling device 23 is moved up and down. When the set leveling depth of the ground leveling switch 73 is changed, the electric motor 58 operates so that the leveling depth H2 of the ground leveling device 23 becomes the set leveling depth of the changed ground leveling switch 73, and the leveling device 23 Is raised and lowered.

When the set height H1 (set planting depth of seedlings) is changed, the ground leveling is based on the changed set height H1 (set planting depth of seedlings) and the detection value of the height sensor 74. The ground leveling depth H2 of the device 23 is detected, and the electric motor 58 is operated to raise and lower the ground leveling device 23 so that the leveling depth H2 of the ground leveling device 23 becomes the set leveling depth of the ground leveling switch 73.

When the ground leveling switch 73 is operated to the retracted position, the electric motor 58 raises the ground leveling device 23 to the upper limit position. The upper limit position of the ground leveling device 23 is a position where the ground leveling device 23 is operated to rise significantly upward from the rice field surface G and the ground leveling device 23 does not touch the ground surface G.

As shown in FIG. 5, the position of the support shaft core P3 (rear part of the float 12) is closest to the seedling planting device 6, and the set height H1 (see FIG. 11) is the lowest (set seedling planting). In the state where the depth is the deepest), it is assumed that the leveling depth H2 is set to the shallowest state (the state where the leveling portion 53b of the leveling body 53 is in contact with the field surface G) by the leveling switch 73.

In the above-mentioned state, when viewed from the side, the axis P9 for rotation of the drive shaft 48 (ground leveling body 53) is below the virtual line A1 extending from the support axis P3 to the front side in parallel (horizontal) with the field surface G. Is located. As a result, the leveling body 53 is configured to have a relatively small diameter.

(First alternative form of carrying out the invention)
The drive shaft 48 may be formed of a drawn aluminum material as shown in FIG. 12 instead of being formed of a square pipe having a square cross section.

In cross-sectional view, four convex portions 48a are formed on the outer surface of the drive shaft 48 along the longitudinal direction of the drive shaft 48, and the convex portions 48a are spaced at 90 degrees along the outer peripheral portion of the drive shaft 48. It is placed open.

A spline portion 48b is formed on the inner surface of the drive shaft 48 along the longitudinal direction of the drive shaft 48, and a sprocket (not shown) to which the transmission chain 52 (see FIG. 4) is attached is a spline portion of the drive shaft 48. It is inserted into 48b and connected to the drive shaft 48.

When the drive shaft 48 is inserted into the square hole 53e of the ground leveling body 53 and the square hole 69a of the partition member 69, the convex portion 48a of the drive shaft 48 becomes the square hole 53e of the ground leveling body 53 and the square hole 69a of the partition member 69. By entering the corner portion on the inner surface of the ground leveling body 53, the corner portion on the inner surface of the square hole 53e of the ground leveling body 53 and the square hole 69a of the partition member 69 and the convex portion 48a of the drive shaft 48 engage with the ground leveling body 53 and the partition. The member 69 is rotationally driven integrally with the drive shaft 48.

In FIG. 12, convex portions 48a such as 3, 5, and 6 may be formed on the outer surface of the drive shaft 48. In this case, the square hole 53e of the ground leveling body 53 and the square hole 69a of the partition member 69 may be formed into a triangular shape, a pentagonal shape, or a hexagonal shape.

(Second alternative form of carrying out the invention)
The drive shaft 48 may be formed of a drawn aluminum material as shown in FIG. 13 instead of being formed of a square pipe having a square cross section.

In cross-sectional view, a spline portion 48c is formed on the outer surface of the drive shaft 48 along the longitudinal direction of the drive shaft 48, and a spline portion 48b is formed on the inner surface of the drive shaft 48 along the longitudinal direction of the drive shaft 48. There is. With respect to the spline portion 48c of the drive shaft 48, the square hole 53e of the ground leveling body 53 and the square hole 69a of the partition member 69 are also formed in the same shape as the spline portion 48c of the drive shaft 48.

(Third alternative form of carrying out the invention)
The configurations described in (the first alternative embodiment of the invention) and (the second alternative embodiment of the invention) may be adopted for the spacers 67 and 68.

(Fourth alternative form of carrying out the invention)
The ground preparation device 23 is not supported by the lower part on the front side of the seedling planting device 6 (working device), but is not supported by the lower part on the front side, but is extended from the machine body 3 to the rear side (not shown) or below the link mechanism 4. The ground preparation device 23 is supported by a link mechanism (not shown) extending to the side, and the ground preparation device 23 is arranged between the seedling planting device 6 (working device) and the rear wheel 2 in a side view. It may be configured to be.

The present invention can be applied not only to a riding-type rice transplanter but also to a paddy field working machine such as a riding-type direct sowing machine equipped with a sowing device (corresponding to a working device) (not shown) for supplying seeds to the rice field surface.

2 Rear wheel 3 Airframe 5 Hydraulic cylinder 6 Seedling planting device (working device)
12 Float 29 Planting depth lever (planting depth setting part)
35 Transmission shaft 48 Drive shaft 48a Convex part 50 Support member 53 Ground leveling body 53e Square hole 54 Support member 55 Cover 67a Convex part (ground leveling part)
67b Recess (leveling part)
67 Spacer 68 Spacer 83 Planting lift control unit 84 Ground leveling lift mechanism A1 Virtual line G Field surface H1 Set height P3 Support shaft core P9 Shaft core W1 Spacer width W3 Ground leveling body width

Claims (8)

A side view is provided with a ground leveling device that is placed between the work device supported at the rear of the machine and the rear wheels of the machine to level the ground surface.
In the ground leveling device
A drive shaft that is supported so that it can be rotationally driven along the left-right direction,
A plurality of ground leveling bodies that are attached to the drive shaft so as to line up along the longitudinal direction of the drive shaft and are rotationally driven integrally with the drive shaft to level the ground surface.
A spacer that is rotatably attached to a predetermined position in the longitudinal direction of the drive shaft to determine the position of the ground leveling body on the drive shaft and has an uneven ground leveling portion formed on the outer surface. Paddy work machine equipped with. The paddy field working machine according to claim 1, wherein the spacer has a smaller diameter than the ground leveling body and a larger diameter than the drive shaft. The paddy field working machine according to claim 2, wherein the spacer is arranged at a position rearward from the rear wheel in a plan view. The paddy field working machine according to claim 2 or 3, wherein the spacer is arranged at a position below the transmission shaft for transmitting power to the working device in a front view. The paddy field working machine according to any one of claims 2 to 4, wherein the width of the spacer is set to be larger than the width of the ground leveling body. When viewed from the side, a cover is provided which is arranged behind the ground leveling body and is arranged along the longitudinal direction of the drive shaft to prevent muddy water from scattering from the leveling body to the working device.
The paddy field working machine according to any one of claims 1 to 5, further comprising a support member for supporting a right portion and a left portion of the cover and an intermediate portion between the right portion and the left portion of the cover. .. The work device is a seedling planting device for planting seedlings on the surface of a rice field, and is supported by a hydraulic cylinder so as to be able to move up and down to the rear part of the machine body.
A float that is swingably supported up and down around the support axis in the left-right direction of the seedling planting device and follows the ground surface.
The seedling planting depth by the seedling planting device is set by operating the hydraulic cylinder so that the seedling planting device is maintained at a set height from the field surface based on the swing of the float. Equipped with a planting lift control unit to maintain the planting depth,
By changing the position of the support shaft core in the seedling planting device up and down, the set height is changed to set the set planting depth, and the planting depth setting unit.
A ground leveling mechanism capable of raising and lowering the ground leveling device is provided.
In a state where the set height is set to the lowest state by the planting depth setting unit and the ground leveling device is lifted and lowered to a height at which the ground leveling body comes into contact with the rice field surface by the ground leveling elevating mechanism. The paddy field working machine according to any one of claims 1 to 6, wherein the axis of rotation of the drive shaft is located below the virtual line extending from the support axis in parallel with the field surface. A square hole is opened through the ground leveling body along the left-right direction.
A convex portion that enters the corner portion on the inner surface of the square hole is formed on the outer surface of the drive shaft along the longitudinal direction of the drive shaft.
The paddy field working machine according to any one of claims 1 to 7, wherein the ground leveling body is integrally rotatably attached to the drive shaft by inserting the convex portion into the corner portion.

Images