JP2010226987A - Transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transplanter capable of reducing a lowering speed of a transplanting device without newly providing a hydraulic valve or operation means. <P>SOLUTION: The riding-type rice transplanter 1 includes a hydraulic pressure sensitivity-regulating dial 16 having a speed-decelerating controlling position 48 for lowering the transplanting device 30 at a speed lower than the normal speed when lifting or lowering the transplanting device 30 when operated to a hydraulic mode, and a stopping position 49 for stopping the lowering of a hydraulic cylinder 21. As a result, when switched to the hydraulic pressure mode, that is, when carrying out maintenance or the like, the transplanting device 30 can be lowered at a lowering speed lower than the normal speed without providing another operation means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transplanter such as a rice transplanter, and more particularly, to a transplanter that can hydraulically control a planting device connected to a rear portion of a traveling machine body.

  2. Description of the Related Art Conventionally, transplanters such as rice transplanters have a planting device connected to a rear portion of a traveling machine body that can be moved up and down by a lifting device controlled by hydraulic pressure. In such a transplanter, for example, when working at the heel, when the planting device is lowered at a normal operation speed, if there is an obstacle or the like in the lowered position, the stop operation will not be in time, and the planting device will not be in time. May be damaged. For this reason, it has been proposed that the planting device can be lowered at a lower speed than usual, and the planting device is prevented from being damaged as described above (for example, patents). Reference 1).

Japanese Patent No. 4001216

  By the way, in the transplanter having the planting device connected to be movable up and down as described above, for example, when the planting device is stored in a barn or for maintenance, the planting device is disconnected from the traveling machine body or reconnected. In order to do so, it is necessary to accurately adjust and stop the height of the planting device. When adjusting the height of the planting device of such a transplanter, it is only necessary to perform the lowering operation from the upper limit position of the planting device. However, in the normal operation of lowering the planting device, the hydraulic valve Since the opening degree is fully open and the descending speed is increased, it is difficult to accurately adjust and stop, and the shock at the time of stopping becomes large and the airframe may become unstable.

  For this reason, like the transplanter described in the above-mentioned patent document 1, it is conceivable to provide an elevating device that is easy to adjust and stop accurately by performing the descending operation of the planting device at a slower speed than usual. However, the descending control of the planting device in the lifting device described in Patent Document 1 is control that can be performed during planting work, and when these controls are used for other than planting work such as maintenance, In addition, there is a problem that the operation means becomes complicated due to an increase in the number of operation means. In addition, it is conceivable to newly provide a hydraulic valve for maintenance work that allows the lifting device in the transplanter to move down at a slower speed than usual, but this increases the number of parts and increases the cost. There was a problem.

  Accordingly, an object of the present invention is to provide a transplanter that can slow down the descending speed of the planting apparatus without providing a new hydraulic valve or operating means.

The present invention according to claim 1 is a traveling machine body (6) driven by an engine (M), a planting device (30) supported by a rear portion of the traveling machine body so as to be movable up and down, and the traveling machine body (6). ) And a raising / lowering drive device (21) for hydraulically raising and lowering the planting device (30), and a planting depth of the planting device (30) is kept constant during the planting operation state. A planting depth control device (35) for controlling the elevating drive device (21) and a hydraulic sensitivity adjustment operating means (16) for adapting the planting depth control device to the hardness of the field scene. In the transplanter (1) provided,
A hydraulic mode switching means for switching the hydraulic sensitivity adjustment operation means (16) to lowering control of the planting device (30) by the lifting drive device (21);
When the hydraulic sensitivity adjustment operation means (16) is switched to the hydraulic mode, the hydraulic sensitivity adjustment operation means is moved to a planting device (30 at a speed slower than a normal speed when the planting device (30) is driven to move up and down. ), A slow speed control position (48), and a stop position (49) for stopping the lowering and lowering drive device (21).
In the transplanter (1) characterized by this.

According to a second aspect of the present invention, the hydraulic mode switching means is an on state of a key switch (18) in which the engine (M) is stopped and the main power can be turned on and off.
It exists in the transplanter (1) of Claim 1.

According to a third aspect of the present invention, there is provided a planting clutch capable of connecting / disconnecting power from the engine (M) to the planting device (30), and a planting operation switching operation for permitting the operation of the planting clutch. Means (19),
The hydraulic mode switching means is a state in which the planting work switching operation means (19) does not permit the planting clutch engagement operation.
It exists in the transplanter (1) of Claim 1 or 2.

When the planting apparatus (30) is lowered, the present invention according to claim 4 is lowered at the normal speed until the predetermined height is reached with respect to the farm scene. , Equipped with a slow speed control before grounding that is lowered at a speed slower than the normal speed,
Canceling the pre-contact slow speed control by the hydraulic mode switching means,
It exists in the transplanter (1) in any one of Claims 1 thru | or 3.

  Note that the reference numerals in the parentheses are for comparison with the drawings, but this is for convenience to facilitate understanding of the invention and has no influence on the structure of the claims. is not.

  According to the first aspect of the present invention, the hydraulic sensitivity adjustment operating means is provided with the slow speed control position for lowering the planting device at a speed slower than the normal speed when the planting device is driven to move up and down, and the lowering of the lifting drive device. Since the stop position for stopping is provided, the planting device can be lowered at a lowering speed slower than usual even when the mode is switched to the hydraulic mode, that is, at the time of maintenance or the like. Thereby, it is possible to easily adjust the height of the planting device accurately, and it is possible to prevent the shock and the airframe from becoming unstable even when stopped from the lowered state. In addition, since the slow speed control can be performed by the hydraulic sensitivity adjustment operation means, it is not necessary to newly provide a hydraulic valve, an operation means, etc. for maintenance, etc., increasing the number of parts and increasing the cost. Prevention can be achieved.

  According to the second aspect of the present invention, the hydraulic mode is entered when the engine is stopped and the key switch is turned on, so that, for example, during a planting operation where the planting device is to be lowered at a normal lowering speed, It is possible to prevent an erroneous operation such that the descending speed becomes slow due to the slow speed control.

  According to the third aspect of the present invention, when the planting work switching operation means is in a state where the planting clutch is not permitted to be engaged, the hydraulic mode is set. For example, the planting device is lowered at a normal lowering speed. During the planting operation, it is possible to prevent an erroneous operation such that the descending speed becomes slow due to the slow speed control.

  According to the fourth aspect of the present invention, when switching to the hydraulic mode, the slow speed control before grounding is canceled, so that, for example, the slow speed control and the slow speed control before grounding act simultaneously, which is not intended by the operator. It is possible to prevent a change in the descending speed of the planting device.

The side view which shows the riding rice transplanter which concerns on this invention. The front view which shows an operation panel part. The side view which shows a lifter cam and its periphery. The side view which shows the float and the periphery of a sensing plate. The circuit diagram which shows the hydraulic control apparatus of a riding rice transplanter. The enlarged view which shows a hydraulic sensitivity adjustment dial. The block diagram which shows the input / output of a control part. The flowchart which shows work implement control. In the flowchart showing the hydraulic mode control, (a) is when the hydraulic mode condition is a work preparation switch, and (b) is when the hydraulic mode condition is that the engine is stopped and the key switch is turned on. The flowchart which shows work implement operation control.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. The riding rice transplanter (transplanter) 1 in the present embodiment has a traveling machine body 6 supported by front wheels 2 and rear wheels 3, as shown in FIG. An engine M (see FIG. 5) is mounted on the traveling machine body 6 in a bonnet 5 in the front portion of the front wheel 2, and a driver's seat section having a seat seat 7 in the middle part in the front-rear direction of the traveling machine body 6. 9 is disposed. An operation member such as a steering wheel 10 is disposed in the driver seat portion 9, and pedals for various operations protrude on steps below the driver seat portion 9.

  Behind the traveling machine body 6, a planting device 30 is supported so as to be movable up and down via a lifting link mechanism 20 having an upper link 20a and a lower link 20b. The planting device 30 has a plurality of planting rods 32 and mat seedlings. Is provided. Further, a planting depth control device 35, which will be described later in detail, is provided behind the traveling machine body 6 and includes a float 36 and the like. The planting device 30 can be rolled by a rolling shaft (not shown) installed on the link support frame 46 at the rear end of the elevating link mechanism 20. The rear portion of the float 36 is pivotably mounted about a shaft 42 provided at the lower portion of the transmission case 41, and a sensing link 43 (see FIG. 4 described later) is pivotally supported and connected to the front portion thereof. Has been.

  A hydraulic cylinder (elevating drive device) 21 is disposed in the elevating link mechanism 20 behind the traveling machine body 6. The hydraulic cylinder 21 is based on an operation of a work machine operation lever 12 (see FIG. 2) provided in the driver's seat 9, and a control unit 60 (FIG. 7 is also made up of a microcomputer disposed in a cover below the seat 7). Under the control, the expansion / contraction is controlled by a hydraulic control valve 22 (see FIG. 3) provided in the hydraulic control device 50 described later, and the planting device 30 is moved up and down. In addition, at the time of the raising / lowering operation of the planting apparatus 30 as described above, the height of the planting apparatus 30 is detected by a lifter angle potentiometer 61 (see also FIG. 7).

  As shown in FIG. 3, an operating body 23 is disposed together with the hydraulic control valve 22 in the cover below the seat 7, and the hydraulic control valve 22 is operated by the operating body 23. The operating body 23 includes a lifter cam motor 24 disposed in the vicinity of the hydraulic control valve 22, a small gear 25 that rotates integrally with the motor shaft of the lifter cam motor 24, and a lifter cam 26 that meshes with the small gear 25. And have. A lifter cam potentiometer 27 for detecting the rotation angle of the fulcrum shaft is attached to the fulcrum shaft of the lifter cam 26.

  A valve operation plate 28 is fixed to an operation shaft of the hydraulic control valve 22, and hydraulic hoses 71 and 72 are connected to the hydraulic cylinder 21 and a hydraulic pump (not shown) from the hydraulic control valve 22. The lifter cam 26, the hydraulic control valve 22, and the valve operation plate 28 are arranged so as to overlap in a side view.

  The hydraulic control valve 22 is operated by changing the state of the valve operation plate 28 to four positions of ascending, fixing, descending (automatic), and planting by the hydraulic cylinder 21. And by the said raise which is a lift function, the planting apparatus 30 will be raised, and when this planting apparatus 30 reaches the highest raising position, it will be in a fixed state automatically. In the fixed state, the inflow of hydraulic oil to the hydraulic cylinder 21 stops, so that the planting device 30 is held at a constant height. Further, when the planting device 30 is lowered by the above-described lowering or planting, which is a lift function, and the float 36 comes into contact with the rice field, automatic control is set. In the automatic control, the valve operating plate 28 is directly moved by a link connected to the float 36. Therefore, the unevenness of the rice field is detected by the float 36 and the planting device 30 is automatically moved up and down. It has become. That is, the planting device 30 detects the posture change (frontal swing) of the float 36 due to the unevenness of the surface with the float posture detection potentiometer 62 (see FIG. 7) via the sensing link 43, and based on the detection result. The hydraulic control valve 22 is controlled by the control signal from the control unit 60 (see FIG. 7). The planting depth control device 35 is configured by the hydraulic control valve 22, the float 36, and the like.

  On the other hand, as shown in FIG. 2, the driver seat portion 9 is provided with a switch box 11 below the steering wheel 10, and the switch box 11 is provided with a work machine operation lever 12. A hydraulic sensitivity adjustment dial 16 (hydraulic sensitivity adjustment operation means), which is a feature of the present invention, is disposed on the front side of the front panel 13 disposed so as to surround the steering wheel 10 and the switch box 11. A headland leveling dial 17, a key switch 18, a work preparation switch (planting work switching operation means) 19, and the like are disposed, and a main transmission lever 15 is disposed on the left side of these switches. Further, various monitors are disposed on the panel surface at the top of the front panel 13.

  As shown in FIG. 5, the hydraulic control device 50 includes an oil pump 51 that is drivingly connected to the engine M, an HST unit 52 that controls the shifting of the traveling machine body 6, and a power steering unit 53 that controls the power steering mechanism. And a lift control unit 54 that performs hydraulic control of the hydraulic cylinder 21 and the like. The elevating control unit 54 is provided with a hydraulic control valve 22 including an ascending hydraulic control valve 22a and a descending hydraulic control valve 22b. Accordingly, the planting device 30 is moved up and down by the expansion and contraction of the hydraulic cylinder 21, and the hydraulic cylinder 21 always supplies hydraulic oil pumped from the oil pump 51 to the hydraulic control valve 22 based on the operation of the work machine operation lever 12. Controlled by movement. Note that the hydraulic control device 50 of the riding rice transplanter 1 according to the present embodiment actually has many other valves and oil passages, but is omitted for convenience of explanation. .

  Here, the raising / lowering control of the planting apparatus 30 is demonstrated based on FIG. When the work implement operating lever 12 (see FIG. 2) is operated, the content of the operation is determined by a change-over switch (not shown) arranged in the switch box 11 (see FIG. 2), and from the change-over switch. Is sent to the control unit 60 (see FIG. 7). In the control unit 60, the expansion and contraction of the hydraulic cylinder 21 (see FIG. 1) is controlled by the action of the hydraulic control valve 22 by a control signal corresponding to the signal from the changeover switch. As a result, the planting device 30 is controlled to be lifted and lowered via the lift link mechanism 20.

  The work implement operating lever 12 is linked to a work preparation switch 19 (see FIG. 2) on the front panel 13. When the work preparation switch 19 is in an ON state, the work implement operating lever 12 "plants". Operations such as “clutch on / off” and “elevating and lowering the planting device 30” can be performed. In addition, when the work preparation switch 19 is in the off state, only the “raising and lowering of the planting device 30” can be performed by the work machine operation lever 12.

  Here, a specific operation of the work implement operation lever 12 when the work preparation switch 19 is in each of the above-described on / off states will be described. When the work preparation switch 19 is in the on state, the work implement operation lever 12 can be operated in the up / down and front / rear directions from the center reference position. For example, when the work implement operation lever 12 is operated once in the upward direction from the state where the planting device 30 is grounded and the planting clutch is engaged, the planting clutch is disengaged, and when the planting clutch is operated upward again. From the state of “planting clutch disengaged”, the “planting device rises” further occurs. Conversely, if the planting device 30 is raised and stopped once, the planting device 30 is operated once downward, and then the planting device is lowered. Furthermore, “planting clutch included”. If you want to stop during the “planting device ascending”, perform one operation downward, and if you want to stop during the “planting device descending”, perform one operation upward. Do.

  When the work preparation switch 19 is in the OFF state, only the raising / lowering operation of the planting device 30 can be performed by operating the work machine operation lever 12 in the up and down directions from the center reference position. . In other words, the work preparation switch 19 is an operation means for permitting the planting clutch to be in the engaged state by performing an on operation, and can also prevent erroneous operation of the work implement operating lever 12.

  When the work implement operation lever 12 is operated once in the upward direction, “planting device is raised”, and conversely, when the operation is performed once in the downward direction, “planting device is lowered”. In addition, if you want to stop “planting device rise” halfway, perform one operation in the downward direction. If you want to stop “planting device lowering” halfway, perform one operation in the upward direction. Do.

  In the passenger rice transplanter 1, when the main shift lever 15 (not shown) is moved backward, a reverse shift detection switch (not shown) is turned on, and the lifter cam 26 is moved to the lifter cam motor 24. The planting clutch is disengaged by turning (see FIG. 3) to raise the planting device 30 to a predetermined height.

  Next, automatic hydraulic pressure sensing in the planting apparatus 30 will be described. The mechanism related to the automatic hydraulic pressure sensing is the planting depth control device 35, that is, the movement of the float 36 that floats and sinks due to the "softness" of the surface is transmitted to the hydraulic control valve 22 by the lifting link mechanism 20, and the planting device It is a kind of automatic control that keeps 30 in an appropriate position. In this automatic control, the oil pressure sensitivity is changed and controlled according to changes in engine rotation, work speed, and body posture, and planting is automatically performed at the oil pressure sensitivity that matches the field. In addition, the automatic hydraulic pressure sensitivity is insufficient or excessive depending on the field conditions (the softness of the paddy field) even when the hydraulic pressure sensitivity is changed and controlled in accordance with such changes in engine speed, work speed, and body posture. In such a case, a situation may occur in which the float 36 sinks or floats. In such a case, the reference posture of the float 36 is corrected by changing the reference value of the float posture detection potentiometer 62 by the hydraulic sensitivity adjustment dial 16.

  When the control by the engine rotation is performed, the engine rotation is directly detected by an engine rotation sensor (not shown) which is a pulse unit, and a sensing wire (not shown) is calculated by a calculation process of the control unit 60 (see FIG. 7). ) Is moved forward and backward to correct the basic posture of the float 36. As a result, hydraulic pressure sensing follows engine rotation fluctuations, and good planting can be achieved at high speed. However, when the engine is dropped, the hydraulic pump is also rotated at a low speed, the amount of oil sent to the hydraulic cylinder 21 is decreased, and the planting depth tends to increase. Therefore, the rotation of the engine is directly detected, and the planting depth is maintained at a predetermined depth by changing the basic posture of the float 36 by advancing / retreating the sensing wire and sensitively correcting the hydraulic pressure sensitivity. .

  Further, the control based on the work speed will be described in detail. When the planting speed is increased, the resistance of water increases, and the planting depth may become shallower by sensing the water surface rather than the paddy surface. When the speed change lever is operated to the speed increasing side, the sensing load of the float 36 is pulled by pulling an HST interlocking wire (not shown) connecting the main speed change lever 15 and the link portion of the hydraulic control valve 22 (see FIG. 3). The planting depth is kept constant at a predetermined depth by correcting the hydraulic sensitivity to the insensitive side to prevent the float 36 from being lifted.

  Further, when the control based on the body posture is performed, the body sensor detects an inclination of the traveling body 6 in the front-rear direction, and the control wire 60 advances and retracts the sensing wire. Thereby, the dispersion | variation in the planting depth by the change of the front-back attitude | position of the traveling body 6 can be prevented. For example, when the traveling machine body 6 heads up, the front part of the float 36 is lowered relative to the machine body, the hydraulic control valve 22 is operated to the lower side, and the float 36 may sink and push mud. A situation occurs where the planting depth increases. Such a change in the front and rear posture of the traveling machine body 6 is detected, and the posture of the float 36 with respect to the traveling machine body is corrected to maintain the planting depth at a predetermined depth.

  Further, the hydraulic sensitivity adjustment dial 16 (see also FIG. 2) shown in FIG. 6 is adjacent to the operation positions “1” to “8” and the “8” position (the opposite side to “7”). The position is adapted to the soft farm fields “4” to “1” or the hard farm fields “6” to “8”. The reference posture of the float 36 is adjusted by rotating the dial 16 until the dial 16 is rotated.

  In a soft field, the front part of the float 36 tends to sink, and the front part side of the float 36 is easily subjected to earth pressure, so that the hydraulic control valve 22 acts in a direction in which the hydraulic control valve 22 ascends via the hydraulic link continuing from the sensing link 43. To do. Further, in a hard farm field, the front part of the float 36 is lifted and the rear side of the float 36 is easily subjected to earth pressure, so that the hydraulic control valve 22 acts in a downward direction.

  By the way, the automatic hydraulic pressure sensing is an operation in the planting operation state in which the planting clutch is in the engaged state, and the hydraulic sensitivity adjustment dial 16 described above also operates in the planting operation state. The riding rice transplanter 1 according to the present embodiment is configured to use the hydraulic pressure sensitivity adjustment dial 16 even in a non-planting operation state. That is, in the riding rice transplanter 1 according to the present embodiment, when the work preparation switch 19 is turned off, the hydraulic mode switching means is used, and the height of the planting device 30 is adjusted for maintenance, for example. It is configured to switch to a hydraulic mode capable of

  When the riding rice transplanter 1 is switched to the hydraulic mode, the position “8” for adapting the automatic hydraulic sensitivity to the hardest field is lowered at a speed slower than the lowering speed by the normal control of the planting device 30. The slow control position 48 for performing the slow speed control is set, and the “lock” position is configured as a stop position 49 for stopping the descent of the planting device 30 by the slow speed control. Further, the hydraulic sensitivity adjustment dial 16 in the hydraulic mode is configured to lower the planting device 30 at the operation positions “1” to “7” at a lowering speed by normal control.

  Thus, when adjusting the height of the planting device 30, until the planting device 30 approaches the target position, for example, the operation position of the hydraulic sensitivity adjustment dial 16 is operated to "7", and the normal lowering speed is set. When approaching the target position, set the operation position of the hydraulic sensitivity adjustment dial 16 to “8”, slowly lower the planting device 30 to the target position, and stop to the “lock” position. Can be performed.

  Moreover, in the riding rice transplanter 1 according to the present embodiment, when the planting device 30 is lowered, the seedling turns up or the planting device 30 performs hunting due to the impact when the planting device 30 contacts the rice field. If the height of the planting device 30 is lowered from the surface to a predetermined height, the duty ratio of the hydraulic control valve 22 is changed so that the planting device 30 is slowly lowered. It can be carried out. In this case, if the slow speed control in the hydraulic mode is simultaneously applied, the descending speed may change against the operator's intention. Therefore, when the hydraulic mode is set, the pre-contact slow speed control is canceled. Has been.

  Next, the control system in the present embodiment will be described with reference to FIG. As shown in FIG. 7, the control unit 60 includes a work preparation switch 19, a key switch 18, a work machine operation lever 12, a lifter cam potentiometer 27, a lifter angle potentiometer 61, a float attitude detection potentiometer 62, and a hydraulic pressure sensitivity adjustment dial 16. Each is configured to receive a signal. In the control unit 60, the hydraulic control valve 22 and the lifter cam motor 24 are controlled via the control 60 based on the above-described input signal.

  Next, work machine control, which is control related to the planting device 30 of the riding rice transplanter 1, will be described with reference to FIGS. As shown in FIG. 8, the work machine control of the riding rice transplanter 1 (step S1 in FIG. 8, hereinafter simply referred to as step SOO) includes hydraulic mode control (step S2), work machine operation control (step S3), It has backup control (step S4) and ascent / stop control (step S5).

  In the hydraulic mode control, the signal output from the control unit 60 to the hydraulic control valve 22 when the planting device 30 is raised or lowered is changed to a mode in which the speed during raising or lowering is changed by changing the duty ratio or the hydraulic pressure is not output. It is a control to switch. The work implement operation control is operation control based on the operation of the work implement operation lever 12. The said backup control is control which raises the planting apparatus 30 to predetermined height, when the driving | running | working state of the traveling body 6 will be in a reverse drive state. The ascent stop control is a control for closing the hydraulic control valve 22 when the planting device 30 is raised to a predetermined (upward limit) height.

  In the hydraulic mode control, control as shown in FIG. When the hydraulic mode control is started (step S211), it is determined whether the work preparation switch 19 is turned on or off (step S212). If the work preparation switch 19 is in the OFF state in this step S212, it is determined that the operation mode has been switched to the hydraulic pressure mode, and the hydraulic pressure control dial 16 is operated in accordance with the hydraulic control regardless of the state of the control flag. It is determined whether or not the valve 22 is in the “lock” position (stop position 49) that holds the closed state (step S213). If the operation position of the hydraulic sensitivity adjustment dial 16 is other than the stop position 49 in step S213, the operation position of the hydraulic sensitivity adjustment dial 16 is any one of “1” to “7” or “8”. ] (Deceleration control position 48) is determined (step S214). If the operation position of the hydraulic sensitivity adjustment dial 16 is “8” in step S214, the hydraulic mode is switched to the slow speed mode (step S215), and the duty ratio of the hydraulic control valve 22 is changed as described above. Thus, the planting device 30 is lowered at a speed slower than the lowering speed by the normal control.

  On the other hand, if the operation position of the hydraulic sensitivity adjustment dial 16 is the “lock” position in step S213, the hydraulic mode is switched to the fixed mode (step S216), and what state the control flag is in? Also, the closed state of the hydraulic control valve 22 is maintained and the descending operation of the planting device 30 is stopped. Further, when the work implement switch 19 is in the on state in step S212 and when the operation position of the hydraulic sensitivity adjustment dial 16 is any one of “1” to “7” in step S214, The hydraulic mode is switched to the normal speed mode (step S217), the duty ratio of the hydraulic control valve 22 is changed, and the planting device 30 is lowered at the normal speed.

  In the work machine operation control (step S3), control as shown in FIG. 10 is performed. When the work machine operation control is started (step S301), it is determined whether or not there is a lowering operation of the planting device 30 by the work machine operation lever 12 (step S302). If there is no lowering operation by the work implement operating lever 12 in step S302, it is determined whether or not there is an ascending operation of the planting device 30 by the work implement operating lever 12 (step S303). In step S303, when there is an ascending operation by the work implement operating lever 12, it is determined by the output of the lifter angle potentiometer 61 whether or not the planting device 30 is in the ascending operation (step S304).

  In step S304, if the planting device 30 is moving up, it returns as it is, and if it is not moving up, it is determined whether the planting device 30 is moving up and down by automatic control (step S304). S305). In step S305, it is determined that the lifting operation is performed by automatic control, and it is determined whether or not the planting apparatus 30 has stopped the lowering operation based on the output of the lifter angle potentiometer 61 (step S312). If it is stopped, the planting device 30 is raised (step S314), and if the lowering operation is not stopped, the lifting operation of the planting device 30 is stopped (step S313). On the other hand, in step S305, it is determined that the planting device 30 is not a lifting operation by automatic control, it is determined whether the planting clutch is in the engaged state (step S306), and the planting clutch is in the engaged state. In some cases, the planting clutch is turned off (step S307), and when the planting clutch is in the off state, the planting device 30 is raised (step S314).

  In the above step S303, when there is no raising operation by the work machine operation lever 12, it is determined whether or not the planting device 30 has stopped the lowering operation (step S308), and the lowering operation has not stopped. In the case where it returns as it is and the descending operation is stopped, the planting device 30 is brought into the up-and-down state by automatic control (step S309). That is, the control unit 60 detects that the float 36 is grounded by the fact that the output of the lifter angle potentiometer 61 is not changed, and sets the “automatic lift” flag when the float 36 is grounded. The “automatic lifting / lowering” means that the posture of the float 36 is detected and the automatic lifting / lowering control is performed so that the float 36 becomes the reference posture. Then, in step S309, after setting the planting device 30 in the automatic lifting control state, it is determined whether or not the planting clutch is waiting to be engaged (step S310). If it is in the waiting state, the planting clutch is turned on (step S311).

  If there is a lowering operation by the work implement operation lever 12 in step S302, the operation state of the work preparation switch 19 is determined (step S315). In step S315, when the work preparation switch 19 is in the on state, it is determined whether or not the planting device 30 is moving up (step S316), and when the planting device 30 is not moving up, It is determined whether or not the planting device 30 is in a fixed state that is in a lift stop state (step S317). In step S317, if the planting device 30 is not in the fixed state, it is determined whether the planting device 30 is in the automatic lifting control state (step S318). If the planting device 30 is in the automatic lifting control state, the planting clutch Is turned on (step S319), and if it is not in the automatic lifting control state, it is determined whether or not the planting device 30 is in the lowering operation (step S325). If the lowering operation is being performed, the planting clutch is placed in a waiting state (step S326). That is, the control unit 60 prevents the aerial planting without setting the planting clutch unless the float 36 is grounded.

  In step S315, if the work preparation switch 19 is in the off state, it is determined whether or not the planting apparatus 30 is moving up (step S320). On the other hand, when it is determined in step S320 and step S316 that the planting apparatus 30 is moving up, the planting apparatus 30 is set in a fixed state (step S323) and returned. In step S320, if the planting device 30 is not moving up, it is determined whether or not the planting device 30 is in a fixed state (step S321). . Further, when it is determined in step S321 and step S317 that the planting device 30 is in the fixed state, the planting device 30 is moved down (steps S322 and S324).

  By the way, the conditions (hydraulic mode switching means) for switching the hydraulic sensitivity adjustment dial 16 to the height of the planting device 30 when the riding rice transplanter 1 according to the present embodiment is switched to the hydraulic mode are As described above, the case where the preparation switch 19 is turned off has been described, but in addition to this, the engine M is stopped and the key switch 18 for turning on / off the main power supply is turned on (hydraulic mode). On the condition of the switching means), it can be configured to switch to the hydraulic mode.

  In this case, in the hydraulic mode control, control as shown in FIG. 9B is performed. When the hydraulic mode control is started (step S221), it is determined whether or not the engine M is stopped and the key switch 18 for turning on / off the main power supply is turned on (step S222). If the engine M is in the stopped state and the key switch 18 for turning on / off the main power source is in the on state in step S222, it is determined that the hydraulic mode has been switched, and the operation position of the hydraulic sensitivity adjustment dial 16 is “ It is determined whether or not it is in the “lock” position (stop position 49) (step S223). If the operation position of the hydraulic sensitivity adjustment dial 16 is other than the stop position 49 in step S223, the operation position of the hydraulic sensitivity adjustment dial 16 is any one of “1” to “7” or “8”. ”(Slow speed control position 48) is determined (step S224). If the operation position of the hydraulic sensitivity adjustment dial 16 is “8” in step S224, the hydraulic mode is switched to the slow speed mode (step S225), and the duty ratio of the hydraulic control valve 22 is changed as described above. Thus, the planting device 30 is lowered at a speed slower than the lowering speed by the normal control.

  On the other hand, if the operation position of the oil pressure sensitivity adjustment dial 16 is the “lock” position in step S223, the oil pressure mode is switched to the fixed mode (step S226), and the control flag is in any state. Also, the closed state of the hydraulic control valve 22 is maintained and the descending operation of the planting device 30 is stopped. In step S222, when the engine M is stopped and the key switch 18 for turning on / off the main power supply is not turned on, and in step S224, the operation position of the hydraulic sensitivity adjustment dial 16 is “1” to “ 7 ", the oil pressure mode is switched to the normal speed mode (step S227), the duty ratio of the oil pressure control valve 22 is changed, and the planting device 30 is lowered at the normal speed.

  In the riding rice transplanter 1 according to the present embodiment, the condition for switching to the hydraulic mode is that the engine M is in the stopped state and the key switch 18 for turning on / off the main power is in the on state. Since there is no difference in other structure, operation | movement, and an effect, description is abbreviate | omitted.

  As described above, according to the riding rice transplanter 1 according to the present invention, the slow speed control position for lowering the planting device 30 to the hydraulic sensitivity adjustment dial 16 at a speed slower than the normal speed when the planting device 30 is driven up and down. 48 and a stop position 49 for stopping the lowering of the hydraulic cylinder 21 are provided, so that the planting device 30 is lowered at a lowering speed than usual even when switching to the hydraulic mode, that is, at the time of maintenance or the like. Can be made. Thereby, it is possible to easily adjust the height of the planting device 30 accurately, and it is possible to prevent the airframe from becoming unstable even when the vehicle is stopped from the lowered state. Further, since the slow speed control can be performed by the hydraulic sensitivity adjustment dial 16, it is not necessary to newly provide a hydraulic valve, an operating means, etc. for maintenance, etc., which increases the number of parts and increases the cost. Prevention can be achieved.

  Further, since the hydraulic mode is entered when the engine M is stopped and the key switch 18 is turned on, for example, during a planting operation in which the planting device 30 is to be lowered at the normal lowering speed, the lowering speed is controlled by the slow speed control. It is possible to prevent erroneous operations such as slowing down.

  In addition, since the hydraulic pressure mode is set when the operation preparation switch 19 does not permit the operation of engaging the planting clutch, for example, during the planting operation in which the planting device 30 is to be lowered at the normal lowering speed, the slow speed control is performed. Therefore, it is possible to prevent an erroneous operation such that the descending speed becomes slow.

  In addition, when switching to the hydraulic mode, the slow speed control before contact is canceled, so that, for example, the slow speed control before contact and the slow speed control before touching act simultaneously to change the descending speed of the planting device not intended by the operator. Can be prevented.

  The hydraulic sensitivity adjustment dial 16 according to the present embodiment has been described as including the operation positions “1” to “8” and the “lock” position. The present invention can be applied even if it is configured to have an operation position of “10” and a “lock” position. In this case, the slow speed control position 48 when switching to the hydraulic mode is set to the “10” position, and the planting device 30 is lowered at the operation positions “1” to “9” by the lowering speed by the normal control. It is preferable to configure.

1 transplanter (riding rice transplanter)
6 Traveling machine body 16 Hydraulic sensitivity adjustment operation means (hydraulic sensitivity adjustment dial)
19 Planting work switching operation means (work preparation switch)
21 Lifting drive (hydraulic cylinder)
30 Planting device 35 Planting depth control device 48 Slow speed control position 49 Stop position

Claims (4)

A traveling machine body driven by an engine, a planting device supported at the rear of the traveling machine body so as to be movable up and down, a lifting drive unit that hydraulically drives the planting device with respect to the traveling machine body, A planting depth control device for controlling the elevating drive device so as to keep the planting depth of the planting device constant during the planting operation state; In a transplanter equipped with a hydraulic sensitivity adjustment operating means adapted to
A hydraulic mode switching means for switching the hydraulic sensitivity adjustment operating means to the lowering control of the planting device by the lifting drive;
A slow speed control position for lowering the planting device at a speed slower than a normal speed when the planting device is driven to move up and down when the hydraulic sensitivity adjustment operation unit is switched to the hydraulic mode; A stop position for stopping the descent of the elevating drive device,
A transplanter characterized by that. The hydraulic mode switching means is an on state of a key switch capable of turning on and off the main power source with the engine stopped.
The transplanter according to claim 1. A planting clutch capable of connecting and disconnecting power from the engine to the planting device, and planting work switching operation means for permitting the operation of the planting clutch;
The hydraulic mode switching means is in a state in which the planting work switching operation means does not allow the planting clutch to be engaged.
The transplanter according to claim 1 or 2. When lowering the planting device, the grounding device is lowered at the normal speed until reaching a predetermined height with respect to the farm scene, and when it reaches the predetermined height, the grounding device is lowered at a speed slower than the normal speed. With front slow speed control,
Canceling the pre-contact slow speed control by the hydraulic mode switching means,
The transplanter according to any one of claims 1 to 3.

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