JP2019106943A - Rice field implement - Google Patents

Abstract

To provide a rice field implement capable of arranging a spring for energizing a grounding body to a drop side in a compact state, when a grounded body and a height sensor for detecting a height from a rice field surface to the implement, are provided.SOLUTION: A rice field implement comprises: a grounded body 9 which is grounded to a rice field surface G and follows to the rice field surface G; a height sensor provided on the implement; a detection arm 42 attached to detection shafts 41a, 49 of the height sensor; a spring 50 for energizing the detection arm 42 to a drop side of the grounded body 9 and externally fitted to detection shafts 41a, 49; and a linkage member 43 connected over the detection arm 42 and the grounded body 9. By lifting of the implement to the grounded body 9, the detection arm 42 is oscillated to the height sensor through the linkage member 43, and the implement height is maintained to a set height H1 from the rice field surface G based on detection of the height sensor.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a paddy field work machine such as a riding type rice planter and a riding type direct sowing machine.

  In a riding type rice planter, which is an example of a paddy work machine, the seedling planting device (equivalent to a work device) supported movably up and down by the machine body is moved up and down by a hydraulic cylinder (equivalent to a lift mechanism) to There is one configured to maintain the planting depth of the seedlings by the seedling planting device at the set depth while maintaining the set height from the field.

Among the riding type rice planters equipped with the functions as described above, there is one as disclosed in Patent Document 1 as a configuration for detecting the height from the field to the seedling planting device.
In Patent Document 1, a float (corresponding to a grounded body) supported so as to be able to move up and down on a seedling planting device, a height sensor, a detection arm of the height sensor, a linkage member connected across the detection arm and the ground body are provided. It is done.

  As a result, when the seedling planting device is moved up and down from the set height with respect to the float that grounds to follow the field, the elevation (height) of the seedling planting device is transmitted to the detection arm through the linking member. The elevation sensor detects the elevation (height) of the planting plant.

JP, 2013-59267, A

  As described above, when the configuration for detecting the height from the field to the work device is provided, the effect of the unevenness of the field is suppressed by providing the spring that biases the grounding body to the downward side, and the contact body is the field. It may be configured to follow the ground stably.

In the case of providing a spring as described above, in Patent Document 1, a coil spring is connected to the rear of the detection arm and extended upward, and the upper end of the coil spring is connected to the fixed portion, and the coil arm The body is always in the downward state.
In Patent Document 1, since the spring is extended largely upward from the detection arm, there is room for improvement in terms of the compactness of the spring support structure.

  The present invention relates to a paddy field work machine having a function of maintaining the work device at the set height from the field, and when the ground body and height sensor for detecting the height from the field to the work device are provided The object is to compactly arrange a spring that biases the downward side.

The paddy field work machine of the present invention is
A work device supported by the machine so as to be able to move up and down, and a lifting mechanism for moving the work device up and down with respect to the machine,
An earthing body which is supported by the working device so as to be able to move up and down and which grounds and follows a field surface
A height sensor provided on the work device;
A detection arm attached to the detection axis of the height sensor and pivotable up and down by rotation of the detection axis;
A spring externally fitted on the detection shaft to bias the detection arm toward the lower side of the grounding body;
A coupling member connected across the detection arm and the grounding body;
By raising and lowering the working device with respect to the grounding body, the detection arm is swung with respect to the height sensor via the linking member,
A control device is provided to maintain the work device at a set height from the field by operating the elevating mechanism based on the detection of the height sensor.

  According to the present invention, the detection arm is attached to the detection axis of the height sensor, and the detection arm is pivotable up and down by the rotation of the detection axis of the height sensor, and the spring is used as the detection axis of the height sensor. By externally fitting, the detection arm is biased by the spring to the lower side of the grounding body, and the grounding body is biased to the lower side via the detection arm and the linking member.

  As a result, the spring does not extend upward from the detection arm, but the spring is disposed around the detection axis of the height sensor, and is compactly arranged. Can be made compact.

In the present invention,
The height sensor and the detection arm are spaced apart along the axial center direction of the detection axis by the detection axis,
A boss externally fitted to the detection shaft is provided between the height sensor and the detection arm;
It is preferable that the spring is externally fitted to the boss.

  According to the present invention, since the height sensor and the detection arm are spaced apart by the detection axis of the height sensor, the spring can be fitted on the detection axis of the height sensor without difficulty.

In this case, the boss is externally fitted to the detection axis of the height sensor between the height sensor and the detection arm, and the spring is externally fitted to the boss so that the spring is the detection axis of the height sensor. It is in the state of being externally fitted.
Thus, since the spring does not contact the detection axis of the height sensor, it is possible to avoid a situation where the detection axis of the height sensor is worn out by the contact with the spring.

In the present invention,
The spring is
A biasing force is generated to bias the detection arm downward in a region above a reference posture set in advance with respect to the height sensor, and the biasing force is generated in a region below the reference posture. It is preferable not to generate it.

  According to the present invention, the spring does not normally bias the detection arm (grounding body) downward by the spring, but biases the detection arm (grounding body) downward in the upper region from the reference posture. Is configured as.

As a result, for example, when the ground contact body rides on the convex portion of the field and the ground contact body ascends with respect to the work device, the detection arm (ground contact body) is biased downward by the spring. It is possible to obtain a state in which the convex portion is crushed.
Conversely, for example, when the ground contact body falls into a recess in the field and the ground contact body descends with respect to the work device, the detection arm (ground contact body) is not biased downward by the spring and the weight of the field is It will be in the state which entraps in a crevice, and a grounding object can avoid the state which digs in the crevice of a field deeply.

  As described above, it is possible to obtain a state in which the convex portion of the field is crushed while avoiding the state in which the concave portion of the field is dug deeply by the ground contact body, thereby improving the work performance of the working device. Can be

In the present invention,
The controller is
Based on the detection of the height sensor, the working device is operated at the set height from the field by operating the elevating mechanism such that the detection arm is maintained in the reference posture with respect to the height sensor. It is preferable to maintain

  According to the present invention, when the work device is controlled to be maintained at the set height from the field based on the detection of the height sensor, according to the present invention, the set height and the reference posture coincide, and the detection arm has the reference posture. The work device is maintained at the set height from the field by raising and lowering the work device by the elevating mechanism so as to be maintained at.

Thus, as described above, the detection arm (grounding body) is biased downward by the spring in the upper region from the reference posture (set height), and in the region lower than the reference posture (set height) The detection arm (grounding body) is not biased downward by the spring.
Therefore, the function of obtaining a state in which the convex portion of the field is crushed while avoiding the state in which the concave portion of the field is dug deep by the grounding body, and the function of maintaining the working device at the set height from the field It can be done.

In the present invention,
A grounding body support portion for supporting the grounding body on the working device so as to be able to move up and down;
A setting height changing unit that changes the setting height by changing the position of the ground support portion relative to the work device up and down;
A height sensor support that changes the orientation of the reference posture up and down by swinging the height sensor about an axis parallel to the axis of the detection axis and changing the attitude;
It is connected over the set height changing unit and the height sensor support unit, and the posture of the height sensor is changed according to the change of the set height by the set height changing unit, and the reference posture is changed. It is preferable that a change operation unit for operating the height sensor support unit is provided so that the direction corresponding to the set height is changed.

  In the paddy field work machine, a grounding body support portion for supporting the grounding body to the working device so as to be able to move up and down, and a setting height changing portion for changing the setting height by changing the position of the grounding body support portion to the working device up and down May be provided. For example, in the riding type rice planter, by changing the set height, it is possible to change the planting depth of the seedlings by the seedling planting device.

  In this case, since the detection arm and the grounding body are connected by the linking member, when the height of the grounding body relative to the work device is changed due to the change of the setting height in the above configuration, the detection is performed accordingly The position (posture) of the arm also needs to be changed.

According to the present invention, when the position of the ground contact body is changed to the upper side (lower side), an axis parallel to the axis of the detection axis of the height sensor so that the reference posture is changed to the direction corresponding to the set height. The attitude of the height sensor is changed around the core.
As described above, with the simple structure in which the attitude of the height sensor is swung around the axis, it is possible to obtain the structure for changing the attitude of the detection arm along with the change of the setting height. It is advantageous in terms of simplification of the structure.

In the present invention,
In the height sensor support,
An upper stopper that stops the detection arm at an upper limit position with respect to the height sensor by hitting the detection arm;
It is preferable that a lower stopper that stops the detection arm at a lower limit position with respect to the height sensor is provided by hitting the detection arm.

  According to the present invention, when the detection arm swings largely to the upper side, the detection arm hits the upper stopper and is stopped at the upper limit position, and when the detection arm swings to the lower side largely, the detection arm hits the lower stopper and the lower limit position Stop at

Thus, by setting the upper limit position and the lower limit position in the swing range of the detection arm, damage to the height sensor and the detection arm due to the detection arm swinging upward and downward more than necessary is prevented. Can.
In this case, the upper and lower stoppers are provided in the height sensor support portion for supporting the height sensor, which is advantageous in terms of simplification of the structure.

It is a side view of a riding type rice transplanter. It is the schematic which shows the connection state of a control apparatus and each part. It is a vertical side view in the vicinity of a float and a height sensor. It is a longitudinal cross-sectional side view in the vicinity of the float in the state which changed the setting height of the seedling planting apparatus into the low side (the planting depth by a planting arm is deep side) from the state shown in FIG. It is a longitudinal cross-sectional side view in the vicinity of the float in the state which changed the setting height of the seedling planting apparatus into the high side (the planting depth by a planting arm is shallow side) from the state shown in FIG. It is a side view of a height sensor support part, a height sensor, and a subject detection arm. It is a cross-sectional top view of a height sensor support part, a height sensor, and a related detection arm. In the 1st other form of embodiment of an invention, it is a vertical side view in the vicinity of a float and a height sensor.

In the embodiment of the present invention, a riding type rice transplanter which is an example of a paddy field work machine is shown.
The front-rear direction and the left-right direction in the embodiments of the present invention are described as follows unless otherwise specified. When the aircraft 11 travels, the forward traveling direction is "front", and the reverse traveling direction is "rear". The direction corresponding to the right side with respect to the forward posture in the front-rear direction is "right", and the direction corresponding to the left side is "left".

(Overall configuration of riding type rice transplanter)
As shown in FIG. 1, the riding type rice transplanter includes a link mechanism 3 (corresponding to a lift mechanism) and a link mechanism 3 at the rear of the fuselage 11 equipped with right and left front wheels 1 and right and left rear wheels 2. A hydraulic cylinder 4 (corresponding to an elevating mechanism) for raising and lowering operations is provided, and a seedling planting device 5 (corresponding to a work device) is supported at the rear of the link mechanism 3.

  The seedling planting device 5 is a support frame 12 (see FIG. 3) disposed in the lower part of the seedling planting device 5 along the left-right direction, and is connected to the support frame 12 at a predetermined interval in the left-right direction. Planting transmission case 6 taken out, rotation case 7 rotatably supported on the right and left sides of the rear of planting transmission case 6, pair of planting arms 8 provided on both ends of rotation case 7, float 9 (corresponding to a grounded body) and a seedling platform 10 and the like.

  The airframe 11 is provided with a driver's seat 13 and a steering handle 14 for steering the front wheel 1. Right and left support frames 15 are provided on the right and left portions of the front of the fuselage 11, and a spare seedling platform 16 is supported on the support frame 15.

(Configuration of traveling transmission system to front and rear wheels)
As shown in FIG. 1, a transmission case 17 is supported on the front of the airframe 11, and an engine 19 is supported on a support frame 18 connected to the front of the transmission case 17.

  A hydrostatic-type continuously variable transmission 20 is connected to the left lateral side of the transmission case 17, and the power of the engine 19 is transmitted to the continuously variable transmission 20 via the transmission belt 21. The continuously variable transmission 20 is configured so as to be continuously steplessly shiftable to the neutral position, forward and reverse sides, and operates the continuously variable transmission 20 by means of the shift lever 22 provided on the left side of the steering handle 14 Do.

The power of the continuously variable transmission 20 is transmitted to the right and left front wheels 1 via an auxiliary transmission (not shown) and a front wheel differential (not shown) inside the transmission case 17.
A rear axle case 23 supporting the right and left rear wheels 2 is supported at the rear of the vehicle body 11, and the power branched from immediately before the front wheel differential device is transmitted to the rear axle case 23 via a transmission shaft 24. , And is transmitted to the right and left rear wheels 2 via a transmission shaft (not shown) inside the rear axle case 23.

(Configuration of work transmission system to seedling planting device)
As shown in FIG. 1, the transmission case (not shown) and the planting clutch (not shown) are provided inside the transmission case 17.

  In the transmission case 17, the power branched from between the continuously variable transmission 20 and the auxiliary transmission is transmitted to the transmission shaft 25 via the inter-train transmission and the planting clutch, and from the transmission shaft 25 to the planting plant 5 It is transmitted.

When the planting clutch is operated to the power transmission state, power is transmitted to the seedling planting device 5, and the seedling planting device 5 is operated. As the seedling platform 10 is driven to reciprocate laterally to the left and right, the rotating case 7 is rotationally driven, and two sets of planting arms 8 take out the seedlings alternately from the lower part of the seedling platform 10 to Plant it (see Figure 3).
When the planting clutch is operated in the shutoff state, the power to the seedling planting device 5 is shut off, the seedling planting device 5 is stopped, and the seedling platform 10 and the rotation case 7 are stopped.

(Configuration of land adjustment device)
As shown in FIG. 1 and FIG. 2, in the seedling planting device 5, the ground leveling device 26 is supported by the support frame 12, and the ground leveling device 26 is between the seedling planting device 5 and the rear wheel 2 in side view. It has been placed in the

  A bracket 27 is connected to the front surface of the support frame 12 and extends forward. A round pipe-shaped support shaft 28 is rotatably supported by the bracket 27 around an axis P1 in the left-right direction, and a support arm 28a is connected to the support shaft 28 and extends forward.

  The shaft support 29 is supported by the support arm 28 a of the support shaft 28, and the drive shaft 30 is rotatably supported around the axial center P 2 of the shaft support 29 in the left-right direction. Body 31 is attached. Thus, the ground leveling device 26 includes the shaft support portion 29, the drive shaft 30, the ground leveler 31, and the like.

  A lift gear 32 is vertically swingably supported by the support frame 12, and a front end portion of the lift gear 32 is swingably connected to the shaft support 29. A gear case 33 and an electric motor 34 are supported by the support frame 12, and a pinion gear 33 a of the gear case 33 is engaged with the elevating gear 32.

  As the pinion gear 33a of the gear case 33 is rotationally driven by the electric motor 34, the lift gear 32 is driven to swing up and down, and the position of the leveling device 26 is changed up and down via the support shaft 28 (support arm 28a). be able to.

  The rear end of the rear axle case 23 is provided with a diagonally downward downward output shaft 35, and the shaft support 29 is provided with a diagonally upward upward input shaft 36, and the transmission shaft is extended across the output shaft 35 and the input shaft 36. 37 are connected.

  In the rear axle case 23, the power transmitted to the rear wheel 2 is branched and transmitted to the output shaft 35, and the power of the output shaft 35 is transmitted to the ground adjusting device 26 via the transmission shaft 37 and the input shaft 36. The drive shaft 30 and the ground body 31 are rotationally driven counterclockwise in FIGS. 1 and 2.

(Outline of elevation control of seedling planting device)
In this riding type rice planter, the hydraulic cylinder 4 lifts and lowers the link mechanism 3 to raise and lower the seedling planting device 5 so that the seedling planting device 5 is maintained at the set height H from the surface G. A lift control function is provided to maintain the planting depth of the seedlings by the planting arm 8 at a set depth.

As shown in FIGS. 1 and 2, the hydraulic cylinder 4 is a single-acting type, and when the working oil is supplied to the hydraulic cylinder 4 and contracted, the link mechanism 3 is operated to raise, and the hydraulic oil is When the discharge and extension operation is performed, the link mechanism 3 is operated to be lowered.
A control device 38 is provided in the machine body 11, a control valve 39 for supplying and discharging the hydraulic oil to the hydraulic cylinder 4 is provided, and the control valve 39 is operated by the control device 38.

  As shown in FIGS. 2 and 3, a support shaft 40 (corresponding to a grounding body support portion) is rotatably supported around an axis P 3 in the left-right direction under the planting transmission case 6. A support arm 40a (corresponding to a ground support body) connected to the rear is extended rearward, and the rear of the float 9 is supported so as to be swingable up and down around the horizontal axis P4 at the rear of the support arm 40a. It is done.

  A height sensor 41 of the potentiometer type is supported by the support frame 12, and a detection value of the height sensor 41 is input to the control device 38. The detection arm 42 is connected to the detection shafts 41 a and 49 of the height sensor 41 and extends rearward, and extends across the bracket 9 a at the front of the central float 9 and the end 42 a of the detection arm 42. The linking member 43 is connected.

  With the above configuration, when the seedling planting device 5 (height sensor 41) ascends and descends with respect to the float 9 that follows the ground contact with the field G, the end 42a of the detection arm 42 is from the field G to the reference height The seedling planting device 5 (height sensor 41) is moved up and down while being positioned at the height H2 (height corresponding to the length of the linking member 43).

  As a result, the detection arm 42 is operated to swing up and down around the axis P5 in the left-right direction of the detection axes 41a and 49 of the height sensor 41 via the linking member 43, so that the detection of the height sensor 41 is performed. A value is input to the controller 38.

  Based on the detection value of the height sensor 41, the control valve 39 is operated by the control device 38, the hydraulic oil is supplied to and discharged from the hydraulic cylinder 4, the hydraulic cylinder 4 is extended and contracted, and the seedling planting device 5 is The seedling planting device 5 (height sensor 41) is moved up and down so that the set height H1 is maintained from the field G. Thereby, the planting depth of the seedling by the planting arm 8 is maintained at the set depth corresponding to the set height H1.

(Details of elevation control of seedling planting device)
If the seedling planting device 5 described above (outline of elevation control of the seedling planting device) is maintained from the field G to the set height H1, the following operation is performed. .

  As shown in FIGS. 2 and 3, a reference posture A1 is set in advance with respect to the height sensor 41. In the state shown in FIGS. 2 and 3, the detection arm 42 is positioned at the reference posture A1, the seedling planting device 5 is maintained at the set height H1 from the field G, and the hydraulic cylinder 4 is stopped. It is a state.

  When the seedling planting device 5 (height sensor 41) is lowered from the state shown in FIGS. 2 and 3, the reference posture A1 is lowered together with the height sensor 41 (the seedling planting device 5 is lowered from the set height H1 To do).

  In this case, the end 42a of the detection arm 42 is maintained at the reference height H2 from the rice field G by the linking member 43, so when the seedling planting device 5 (height sensor 41) is lowered, the height sensor 41 is Thus, the detection arm 42 swings upward, and the detection arm 42 is positioned above the reference posture A1.

  As a result, the detection value (detection arm 42) of the height sensor 41 is in the state of being separated upward from the reference posture A1, the control valve 39 is operated by the control device 38 and the hydraulic cylinder 4 is contracted to The planting device 5 (height sensor 41) is operated to rise.

  As the seedling planting device 5 (height sensor 41) rises, the reference posture A1 rises together with the height sensor 41, and as shown in FIGS. 2 and 3, the detection arm 42 is positioned at the reference posture A1. When it returns to the state (when the seedling planting device 5 returns to the set height H1), the control valve 39 is operated by the control device 38 and the hydraulic cylinder 4 is stopped.

  When the seedling planting device 5 (height sensor 41) rises from the state shown in FIGS. 2 and 3, the reference posture A1 rises together with the height sensor 41 (the seedling planting device 5 rises from the set height H1 To do).

  In this case, since the end 42a of the detection arm 42 is maintained at the reference height H2 from the field G by the linking member 43, when the seedling planting device 5 (height sensor 41) rises, the height sensor 41 is Thus, the detection arm 42 swings downward, and the detection arm 42 is positioned lower than the reference posture A1.

  As a result, the detection value (detection arm 42) of the height sensor 41 is in a state of being separated downward from the reference posture A1, the control valve 39 is operated by the control device 38, and the hydraulic cylinder 4 operates to extend. The seedling planting device 5 (height sensor 41) is operated to descend.

  By lowering the seedling planting device 5 (height sensor 41), the reference posture A1 is lowered together with the height sensor 41, and as shown in FIGS. 2 and 3, the detection arm 42 is positioned at the reference posture A1. When it returns to the state (when the seedling planting device 5 returns to the set height H1), the control valve 39 is operated by the control device 38 and the hydraulic cylinder 4 is stopped.

  With the above configuration, based on the detection of the height sensor 41, the control device 38 operates the control valve 39 to maintain the hydraulic cylinder 4 so that the detection arm 42 is maintained at the reference posture A1 with respect to the height sensor 41. By operating (lifting and lowering mechanism), the seedling planting device 5 (working device) is maintained from the field G to the set height H1.

(Support structure of height sensor)
As shown in FIGS. 3, 6 and 7, two brackets 44 are connected to the support frame 12 and extended obliquely upward to the upper side, and at the front end of the bracket 44, the support shaft 44 a is in the left-right direction It is supported towards.

  A height sensor support 45 is provided, and the height sensor 41 is connected to the height sensor support 45. The boss portion 45a of the height sensor support portion 45 is externally fitted to the support shaft 44a of the bracket 44, and the height sensor support portion 45 is vertically moved around the axis P6 of the support shaft 44a of the bracket 44 in the left-right direction. It is swingably supported.

  As shown in FIGS. 2 and 3, a planting depth lever 46 (corresponding to a set height changing portion) is connected to the support shaft 40 and extends obliquely upward to the upper side, and is connected to the support frame 12 The planting depth lever 46 is inserted into the lever guide 47 that has been inserted. As shown in FIGS. 2, 3, 6, 7, a linkage rod 48 (corresponding to a change operation unit) is connected across the boss 45 b of the height sensor support 45 and the planting depth lever 46. .

By engaging the planting depth lever 46 with the lever guide 47 and fixing the position, the posture of the height sensor support 45 (height sensor 41) is fixed via the link rod 48.
In this case, the height sensor support 45 (height sensor 41) is located above the support shaft 28 of the ground leveling device 26, and supports the height sensor support 45 (height sensor 41) and the ground leveling device 26. The axis 28 and the axis 28 overlap in a plan view.

  The detection axis 49 is connected to the detection axis 41 a of the height sensor 41, and the detection axis 49 extends in the left-right direction. The height sensor support 45 is provided with a boss 45 c extending in the left-right direction. The detection axes 41 a and 49 of the height sensor 41 are rotatably inserted into the boss 45 c of the height sensor support 45, and the detection arm 42 is at the end of the detection axis 49 of the height sensor 41. It is connected.

With the above configuration, the detection arm 42 swings up and down by the rotation of the detection shafts 41a and 49 of the height sensor 41, and around the axis P5 of the detection shafts 41a and 49 of the height sensor 41 in the left-right direction. The detection arm 42 is in the state of being operated to swing up and down.
The axial center P5 of the detection shafts 41a and 49 of the height sensor 41 and the axial center P6 of the support shaft 44a of the bracket 44 are parallel to each other.

A state in which the height sensor 41 and the detection arm 42 are arranged at intervals along the axial center P5 direction of the detection axes 41a and 49 of the height sensor 41 by the detection axes 41a and 49 of the height sensor 41; It has become.
Between the height sensor 41 and the detection arm 42, a boss 45c of the height sensor support 45 fitted on the detection shafts 41a and 49 of the height sensor 41 is provided.

(Structure of spring acting on detection arm, upper stopper and lower stopper)
As shown in FIGS. 6 and 7, a spring 50 of a helical spring type (coil spring type) is rotatably provided on a boss 45c of the height sensor support 45 (the detection shafts 41a and 49 of the height sensor 41). It is externally fitted.

  One end 50 a of the spring 50 is inserted into the opening 42 b of the detection arm 42. An arcuate long hole 51 is opened in the height sensor support 45, and the other end 50 b of the spring 50 is inserted into the long hole 51.

  An upper stopper 52 extended to the upper side of the detection arm 42 is provided on the upper portion of the height sensor support 45. Under the height sensor support 45, a lower stopper 53 extended to the lower side of the detection arm 42 is provided.

  The state shown in FIGS. 3 and 6 is the state where the detection arm 42 is positioned at the reference posture A1 (see the details of the elevation control of the seedling planting device in the preceding paragraph), and the end 50b of the spring 50 is long. It is in contact with one end 51 a of the hole 51.

  As described in (details of elevation control of the seedling planting device) described above, the seedling planting device 5 (height sensor 41) is lowered from the state shown in FIG. 3 and FIG. 6 and detected relative to the reference posture A1. The arm 42 is positioned at the upper side, and when the detection arm 42 hits the upper stopper 52, the detection arm 42 is stopped at the upper limit position B1 with respect to the height sensor 41.

  The end 5 b of the spring 50 is pressed by the detection arm 42 against the end 51 a of the elongated hole 51 in a state where the detection arm 42 is positioned between the reference posture A 1 and the upper limit position B 1 (region above the reference posture A 1). The spring 50 generates a biasing force that biases the detection arm 42 toward the reference posture A1 (downward side). As a result, the central float 9 is biased downward via the detection arm 42 and the linking member 43.

  As described in (details of elevation control of seedling planting device) in the previous paragraph, seedling planting device 5 (height sensor 41) rises from the state shown in FIG. 3 and FIG. 6 and is detected relative to reference posture A1. The arm 42 is positioned at the lower side, and when the detection arm 42 hits the lower stopper 53, the detection arm 42 is stopped at the lower limit position B 2 with respect to the height sensor 41.

  With the detection arm 42 positioned between the reference posture A1 and the lower limit position B2 (the lower area of the reference posture A1), the end 50b of the spring 50 is detected by the detection arm 42 from the end 51a of the long hole 51. As a result, the spring 50 is positioned at the center side of the long hole 51, and no biasing force is generated in the spring 50 to bias the detection arm 42 (the middle float 9) in the downward direction.

(Condition to change the setting height of the seedling planting device to the low side (the planting depth by the planting arm is deep)
As shown in FIGS. 3, 4 and 5, by operating the planting depth lever 46 up and down, the support shaft 40 (support arm 40a) is rotated around the axis P3, and the position of the axis P4 is moved up and down. The position of the shaft center P4 is fixed by engaging the planting depth lever 46 with the lever guide 47 and fixing the position.
Thereby, the set height H1 is changed to high and low, and the planting depth by the planting arm 8 is changed.

  As shown in FIG. 4 from the state of the setting height H1 shown in FIGS. 2 and 3 by operating the planting depth lever 46, when the setting height H1 is lowered, the planting depth by the planting arm 8 It gets deeper.

  As shown in FIG. 4, when the set height H1 is decreased by the planting depth lever 46 (when the planting depth by the planting arm 8 is increased), the operation of the planting depth lever 46 is performed via the connecting rod 48. The height sensor support 45 is transmitted to the height sensor support 45, and the attitude of the height sensor support 45 is changed downward (counterclockwise in FIGS. 3 and 4) around the axis P6 (the support shaft 44a of the bracket 44). Be done. Thus, the attitude of the height sensor 41 is changed together with the height sensor support 45, and the reference attitude A1 is changed slightly upward.

  As described above, lowering the setting height H1 means that the height sensor 41 and the float 9 come close to each other. Therefore, the height sensor 41 (height sensor support portion only by the amount of lowering the setting height H1 45) is changed, and the reference posture A1 is changed slightly upward, so that the end 42a of the detection arm 42 is a reference height H2 (height equivalent to the length of the linking member 43) from the field G (See FIG. 2).

  In the above state, the posture of the height sensor 41 is changed according to the change of the setting height H1 by the planting depth lever 46 (setting height changing portion), and the reference posture A1 is the direction corresponding to the setting height H1 It is a state to be changed to

  Thus, as described in the previous paragraph (details of elevation control of the seedling planting device), the seedling planting device 5 is positioned at the set height H1 from the field G in a state where the detection arm 42 is positioned at the reference posture A1. Then, an operation is performed to maintain the seedling planting device 5 from the field G to the set height H1.

  In this case, since the posture of the spring 50 is also changed along with the height sensor support portion 45, the spring 50, the upper stopper 52 and the lower stopper 53 The same condition as described in the structure occurs.

(A state where the setting height of the seedling planting device is changed to the high side (the planting depth by the planting arm is shallow)
When the setting height H1 is increased as shown in FIG. 5 from the state of the setting height H1 shown in FIG. 2 and FIG. 3 by operating the planting depth lever 46, the planting depth by the planting arm 8 It gets shallow.

  As shown in FIG. 5, when the set height H1 is increased by the planting depth lever 46 (when the planting depth by the planting arm 8 is reduced), the operation of the planting depth lever 46 is via the connecting rod 48. The height sensor support 45 is transmitted to the height sensor support 45, and the attitude of the height sensor support 45 is changed upward (clockwise in FIGS. 3 and 5) around the axis P6 (support shaft 44a of the bracket 44). . Thereby, the attitude of the height sensor 41 is changed together with the height sensor support 45, and the reference attitude A1 is changed slightly downward.

  As described above, increasing the setting height H1 means that the height sensor 41 and the float 9 are separated, so the height sensor 41 (height sensor support portion is increased by the amount of increasing the setting height H1. 45) is changed, and the reference posture A1 is changed slightly downward, so that the end 42a of the detection arm 42 is a reference height H2 (height equivalent to the length of the linking member 43) from the field G (See FIG. 2).

  In the above state, the posture of the height sensor 41 is changed according to the change of the setting height H1 by the planting depth lever 46 (setting height changing portion), and the reference posture A1 is the direction corresponding to the setting height H1 It is a state to be changed to

  Thus, as described in the previous paragraph (details of elevation control of the seedling planting device), the seedling planting device 5 is positioned at the set height H1 from the field G in a state where the detection arm 42 is positioned at the reference posture A1. Then, an operation is performed to maintain the seedling planting device 5 from the field G to the set height H1.

  In this case, since the posture of the spring 50 is also changed along with the height sensor support portion 45, the spring 50, the upper stopper 52 and the lower stopper 53 The same condition as described in the structure occurs.

(Elevating the leveling device with changing the setting height of the seedling planting device (planting depth by the planting arm))
Since the ground leveling device 26 is supported by the seedling planting device 5 (support frame 12), as described above, when the set height H1 is changed by the planting depth lever 46 (planting with the planting arm 8 When the depth is changed, the leveling depth of the leveling device 26 (the depth at which the leveling device 26 enters the field G) changes.

  In this case, as shown in FIG. 2, an operation position sensor 54 for detecting the operation position of the planting depth lever 46 is provided, and a detection value of the operation position sensor 54 is input to the control device 38.

  When the set height H1 is lowered by the planting depth lever 46 (when the planting depth by the planting arm 8 is increased), the control device 38 operates the electric motor 34 based on the detection value of the operation position sensor 54 As a result, the leveling device 26 is operated to be raised with respect to the seedling planting device 5 as much as the set height H1 is lowered. As a result, the leveling depth of the leveling device 26 (the depth at which the leveling device 26 enters the field G) is maintained at a constant value.

  When the set height H1 is increased by the planting depth lever 46 (when the planting depth by the planting arm 8 is reduced), the electric motor 34 is operated by the control device 38 based on the detection value of the operation position sensor 54 As a result, the leveling device 26 is lowered relative to the seedling planting device 5 as much as the set height H1 is increased. As a result, the leveling depth of the leveling device 26 (the depth at which the leveling device 26 enters the field G) is maintained at a constant value.

(First Embodiment of the Invention)
As shown in FIG. 8, in the height sensor support 45, the elongated hole 51 may be provided below the height sensor support 45.

(Second alternative embodiment of the invention)
The height P sensor supporting portion 45 (height sensor 41) is set as the linking rod by setting the axis P5 of the detection axes 41a and 49 of the height sensor 41 and the axis P6 of the support axis 44a of the bracket 44 identical. At 48, the posture may be changed around the axis P5 of the detection axes 41a and 49 of the height sensor 41.
Instead of the float 9, a flat-plate-like sled-like or rake-like grounding body may be used.
The detection arm 42 may be configured to extend to the front side from the detection axes 41 a and 49 of the height sensor 41 instead of the rear side.

  The present invention is not only a riding type rice transplanter, but also a riding type seeding machine equipped with a seeding device (corresponding to a working device) (not shown) for supplying seeds to the field G, a supply for feeding fertilizers and medicines to the field G. The present invention can also be applied to a paddy field work machine provided with an apparatus (corresponding to a work apparatus) (not shown).

3 Link mechanism (lifting mechanism)
4 Hydraulic cylinder (lifting mechanism)
5 Seedling planting equipment (work equipment)
9 Float (grounded body)
11 airframe 38 control device 40 support shaft (grounding body support portion)
40a Support arm (grounding body support)
41 Height Sensor 41a, 49 Detection Axis 42 Detection Arm 43 Linkage Member 45 Height Sensor Support Part 45c Boss Part 46 Planting Depth Lever (Setting Height Change Part)
48 Linkage Rod (Change Operation Unit)
50 spring 52 upper stopper 53 lower stopper A1 reference posture B1 upper limit position B2 lower limit position G field H1 setting height P5 axis core P6 axis core

Claims (6)

A work device supported by the machine so as to be able to move up and down, and a lifting mechanism for moving the work device up and down with respect to the machine,
An earthing body which is supported by the working device so as to be able to move up and down and which grounds and follows a field surface
A height sensor provided on the work device;
A detection arm attached to the detection axis of the height sensor and pivotable up and down by rotation of the detection axis;
A spring externally fitted on the detection shaft to bias the detection arm toward the lower side of the grounding body;
A coupling member connected across the detection arm and the grounding body;
By raising and lowering the working device with respect to the grounding body, the detection arm is swung with respect to the height sensor via the linking member,
A paddy field work machine provided with a control device for maintaining the work device at a set height from a rice field by operating the elevating mechanism based on the detection of the height sensor. The height sensor and the detection arm are spaced apart along the axial center direction of the detection axis by the detection axis,
A boss externally fitted to the detection shaft is provided between the height sensor and the detection arm;
The paddy field work machine according to claim 1, wherein the spring is externally fitted to the boss portion. The spring is
A biasing force is generated to bias the detection arm downward in a region above a reference posture set in advance with respect to the height sensor, and the biasing force is generated in a region below the reference posture. The paddy field work machine according to claim 1 or 2 which does not generate. The controller is
Based on the detection of the height sensor, the working device is operated at the set height from the field by operating the elevating mechanism such that the detection arm is maintained in the reference posture with respect to the height sensor. The paddy field work machine according to claim 3 to maintain. A grounding body support portion for supporting the grounding body on the working device so as to be able to move up and down;
A setting height changing unit that changes the setting height by changing the position of the ground support portion relative to the work device up and down;
A height sensor support that changes the orientation of the reference posture up and down by swinging the height sensor about an axis parallel to the axis of the detection axis and changing the attitude;
It is connected over the set height changing unit and the height sensor support unit, and the posture of the height sensor is changed according to the change of the set height by the set height changing unit, and the reference posture is changed. The paddy field work machine according to claim 3 or 4 provided with the change operation part which operates said height sensor support part so that it may be changed to the direction corresponding to said setting height. In the height sensor support,
An upper stopper that stops the detection arm at an upper limit position with respect to the height sensor by hitting the detection arm;
The paddy field work machine according to claim 5 provided with a lower stopper which stops said detection arm in a lower limit position to said height sensor by hitting said detection arm.

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