JP2012191889A - Seedling transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seedling transplanter that reduces a cost and improves maintainability by transmission adjustment of rotation inside of a simple constitution, deals with sudden occurrence of slip, secures planting accuracy and work efficiency and secures output necessary for turning.SOLUTION: The seedling transplanter includes a traveling vehicle body 2 equipped with front and rear wheels 10 and 11 of all-wheel drive, a differential gear apparatus 51 with differential lock mechanism 51a of the front wheels 10, a clutch mechanism 18c of the rear wheels 11, a control rod member 52 for stopping rear wheel transmission of turning inside and a planting apparatus 4 liftably supported by a raising and lowering link mechanism 3 during rotation. The seedling transplanter has a clutch setting mechanism 53 for maintainably setting right and left rear wheel power by action regulation of the right and left clutch mechanisms 18c and 18c and the raising and lowering link mechanism 3 has a rise control mechanism C for lowering the rise position of the planting apparatus 4 with operation of the differential lock mechanism 51a by the slip of the front wheels 10 during machine turning.

Description

  The present invention relates to a seedling transplanting machine configured so that planting setting of seedlings can be adjusted.

The seedling transplanting machine described in Prior Art Document 1 has a configuration in which the side clutch inside the turning is turned off during turning to stop the driving force to the rear wheel, and the distance between the turning start position and the turning end position becomes close. However, when the turning operation is performed, the driving force to the rear wheels inside the turning is cut off, so in wet fields where the soil is soft in the field, mud prevents the machine from moving forward, and it takes time to turn and the work efficiency There is a problem that the turning accuracy of the seedlings is lowered due to the lowering of the turning end position.
In Prior Art Document 2, the above problem is solved by using a control mechanism to periodically supply driving force to the rear wheels inside the turn.

JP 2008-195232 A JP 2010-172269 A

However, since the configuration for executing the transmission adjustment control inside the turning is very complicated, the number of parts is increased, which causes a problem of an increase in cost and a decrease in maintainability. In addition to this, the differential lock mechanism of Prior Art Document 1 does not operate when the front wheel slips during turning unless the operator operates it. As a result, there is a problem that the turning end position is shifted and the planting accuracy of the seedling is lowered, or the time required for the turning work is increased, and the work efficiency is lowered.
Furthermore, since the automatic lift mechanism of the prior art documents 1 and 2 raises the planting part to the highest position at the time of turning, there is a problem that the output required for turning becomes insufficient due to the power consumption.

  The purpose of the present invention is to reduce the cost and improve the maintenance by transmission adjustment inside the turning with a simple configuration, and can ensure planting accuracy and work efficiency as it can cope with sudden slip occurrence, and An object of the present invention is to provide a seedling transplanting machine that can ensure the output required for turning.

  The invention according to claim 1 includes a traveling vehicle body 2 having left and right front wheels 10 and 10 and left and right rear wheels 11 and 11 traveling in a farm field, and a diff lock mechanism 51a that synchronously transmits the power of the left and right front wheels 10 and 10. , The left and right clutch mechanisms 18c and 18c for releasing transmission of the power of the left and right rear wheels 11 and 11, respectively, and the clutch mechanisms 18c and 18c on the inner side of the turn in response to the turning operation of the airframe. In the seedling transplanting machine including the left and right control rod members 52 and 52 and the planting device 4 supported so as to be lifted to the non-working position by the lift link mechanism 3 in accordance with the body turning operation, the left and right clutch mechanisms 18c and 18c A clutch setting mechanism 53 is provided for setting the power of the left and right rear wheels so that the left and right rear wheel power can be maintained. Capable constitute the differential device 51, the elevation regulating mechanism C to suppress the rise position of the planting device 4 by the operation of the differential-lock mechanism 51a is characterized in that provided in the lifting link mechanism 3.

  When the inner clutch mechanism releases the transmission of the rear wheel power through the left and right control rod members, and the inner clutch operation is restricted by the clutch setting mechanism, the driving of both rear wheels is maintained. Further, when the front wheel slips during turning, the differential lock mechanism is automatically activated to synchronize the rotation of the front wheels inside and outside the turning. Since the lifting link mechanism is stopped at a predetermined height by the ascent restriction mechanism in conjunction with the front wheel slip at the time of turning, the drive output spent for raising the planting device is reduced, so sufficient output for turning operation Is supplied.

According to a second aspect of the present invention, in the configuration of the first aspect, the left and right control rod members 52, 52 are provided with an expansion / contraction part 52c that allows a relative movement between both ends, and a relative relationship between the expansion / contraction part 52c. The clutch setting mechanism 53 is configured by a switching operation member 55 that is provided with a guide-type cable 54 that is tensioned so as to be able to regulate its operation, and that is connected to both the cables 54 and 54 so as to be able to be relaxed. Features.
When the switching operation member is operated to the cable tension side, the relative movement between both ends of the control rod member is restricted, so that the clutch mechanism on the inner side of the turning is released according to the turning operation, and when the operation is performed to the relaxation side, the control is performed. Since the relative movement between both ends of the rod member is allowed and the control rod member inside the turning does not act even by the turning operation, the clutch mechanism continues to transmit and the rear wheel inside the turning is driven to rotate.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the switching detection member 58 for detecting the operation position by detecting the position of the protruding contact body provided on the switching operation member 55 is provided, and the left and right clutch mechanisms 18c, A notification member 59 is provided to notify the operator when the operation position B restricts the movement of 18c.
When the switching detection member is in a detection state by the operation of the switching operation member, the notification member is activated.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the left and right rear wheels 11, 11 are supported by raising the rear wheel gear cases 18, 18 according to respective driving forces. Swing detection members 18s and 18s for detecting that the position has reached a predetermined high position after swinging the position so as to be movable are provided, and the movement detection member 18s outside the turn is set to a predetermined height within a predetermined time range from the start of the turn. The differential lock mechanism 51a is operated when the position is not detected.
The diff lock mechanism is activated when the support height does not reach the specified height due to slippage of the rear wheel outside the turn during turning, so that even if an operator forgets to operate the diff lock mechanism, the diff lock mechanism is automatically activated. Operates.

According to a fifth aspect of the present invention, in the configuration of any one of the first to fourth aspects, a lift height detecting member 3h that detects the lift height of the lift link mechanism 3 and a differential lock that detects the operation of the differential lock mechanism 51a. A detection member 51s is provided, and the lifting link mechanism 3 is raised and stopped at a predetermined height lower than the non-working height when the differential lock mechanism 51a is operated.
When the differential lock mechanism is operated, the planting device is stopped at a predetermined height by the lifting link mechanism, so that the planting device can turn without contacting the field scene. Since the drive output consumed for the rotation is reduced, an output sufficient for the turning operation is supplied.

According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the planting device 4 is provided with a seedling detection member for detecting the presence or absence of a seedling. The detection is stopped.
When the planting device runs out of seedlings, the lifting restriction of the lifting link mechanism during turning is canceled, so that the planting device can be lifted sufficiently from the field scene under the condition that the weight of the planting device is light and the power load is low. Can turn.

According to the first aspect of the present invention, when turning, the inner clutch mechanism releases the transmission of the rear wheel power via the left and right control rod members, and the rear clutch power is controlled when the inner clutch operation is restricted by the clutch setting mechanism. Since the wheel drive is maintained, if applied to the field where the soil quality is soft and the rotation of the rear wheels is hindered, the airframe is prevented from stopping during the turn and the work efficiency is improved.
Also, if the front wheel slips during turning, the differential lock mechanism automatically operates and the rotation of the front wheels on the inside and outside of the turning synchronizes, so even if the soil is soft and the propulsion of the front wheels may be hindered, the front wheels will run idle. This prevents it from moving and improves work efficiency.
And since it was set as the structure where the raising / lowering link mechanism 3 stops in the predetermined height by a raise control mechanism in conjunction with the front wheel slip at the time of turning, since the drive output consumed for the raising of a planting apparatus reduces, it is enough for turning operation | movement. The output is supplied, and the traveling of the machine body is not hindered at the end of the field, and the work efficiency is improved.

According to the invention according to claim 2, in addition to the effect of the invention of claim 1, when the switching operation member is operated to the tension side of the cable, the relative movement between both ends of the control rod member is restricted, and the inside of the turning is controlled according to the turning operation. If the clutch mechanism is released, and if it is operated to the relaxed side, the relative movement between both ends of the control rod member is allowed, and the control rod member inside the turning does not act even by turning operation, so the clutch mechanism continues to transmit power. Thus, the rear wheel inside the turn is driven to rotate.
As described above, the switching operation member can switch the operation of the clutch mechanism, and when the clutch mechanism is operated and the rear wheels on the inside of the turn are non-powered, the difference between the number of rotations of the rear wheels on the inside and outside of the turning becomes large. Since the distance between the starting position and the turning end position can be shortened, the planting row of the seedlings is less likely to be separated, and the planting accuracy is improved. Since the rotation of both rear wheels can be maintained even in this field, it is possible to prevent the traveling from stopping while the wet field is turning and to improve the work efficiency.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, when the switching detection member is in a detection state by the operation of the switching operation member, the notification member is activated, so that the soil quality of the field is soft. Since the operator can perform operations corresponding to soft soil fields and stabilize the seedling planting running posture, planting accuracy and work efficiency are improved.

  According to the invention of claim 4, in addition to the effect of any one of claims 1 to 3, when the support height does not reach a predetermined height due to the slip of the rear wheel outside the turn during turning, the differential lock mechanism is Because it is configured to operate, even if the operator forgets to operate the diff lock mechanism, the diff lock mechanism automatically operates and it becomes easy to turn at the soft field end, so the time of stopping at the field end is shortened, Work efficiency is improved.

  According to the invention according to claim 5, in addition to the effect of any one of claims 1 to 4, when the differential lock mechanism is operated, the planting device is stopped at a predetermined height by the lifting link mechanism. The device can turn without touching the farm scene, and at this time, the drive output spent for raising and lowering the planting device is reduced, so that a sufficient output is supplied for the turning operation, and the aircraft is running at the field end. There is no hindrance and work efficiency is improved.

  According to the invention of claim 6, in addition to the effect of claim 5, when there is no seedling in the planting device, the lifting restriction of the lifting link mechanism at the time of turning is canceled, so that the weight of the planting device is increased. Since it can lighten and turn up sufficiently from a field scene under the condition that there is little power load, it is prevented that the lower part of a planting device contacts a field scene at the time of turning.

The side view of the seedling transplanter in embodiment concerning this invention Top view of the seedling transplanter in Fig. 1 Enlarged view of the main part of the working part of the clutch mechanism with a partial side view Enlarged side view of main part of clutch setting mechanism with partial plan view System block diagram of lifting control Control flowchart when the differential lock mechanism is activated Enlarged side view of the main part of the swing support part of the rear wheel gear case Perspective view of main part of auto return cable Side view of lifting lever support configuration Flow chart of lifting lever control Flow chart by canceling automatic planting Enlarged sketch of the dial guide for the planting position dial Operation panel sketch

Below, the seedling transplanting machine concerning embodiment of this invention is demonstrated.
FIG.1 and FIG.2 is the side view and top view of a seedling transplanter concerning this Embodiment. This seedling transplanter 1 includes a fertilizer device 5, a lifting link mechanism 3 and the like at a rear portion of a traveling vehicle body 2 having left and right front wheels 10 and 10 and left and right rear wheels 11 and 11 traveling in a farm field. 3, the planting device 4 is configured to be movable up and down.

  Specifically, the traveling vehicle body 2 is a four-wheel drive vehicle including a pair of left and right front wheels 10 and 10 and a pair of left and right rear wheels 11 and 11 as drive wheels, and a transmission case 12 is disposed at the front of the fuselage. Front wheel final cases 13 and 13 are provided on the left and right sides of the vehicle so as to be steerable, and left and right front wheels 10 and 10 are respectively attached to the left and right front wheel final cases 13 and 13.

  Further, the front end portion of the main frame 15 is fixed to the rear portion of the transmission case 12, while the left and right rear wheel gear cases 18, 18 provided at the rear end portion of the main frame 15 are supported and pivotally supported rear wheels. Rear wheels 11 and 11 are attached to axles 17 and 17.

  The engine 20 is mounted on the main frame 15, and the rotational power of the engine 20 is transmitted to the transmission case 12 via the belt transmission device 21 and the HST 23. The rotational power transmitted to the mission case 12 is shifted by a transmission in the case 12 and then separated into traveling power and external power to be extracted. A part of the traveling power is transmitted to the front wheel final cases 13 and 13 to drive the front wheels 10 and 10, and the rest is transmitted to the left and right rear wheel gear cases 18 and 18 to drive the left and right rear wheels 11 and 11. .

  Further, the external extraction power extracted from the right side surface of the mission case 12 is transmitted to the planting device 4 by the planting transmission shaft 26. The power is taken out from the right rear wheel gear case 18 by the drive shaft and transmitted to the fertilizer feeding mechanism of the fertilizer applicator 5.

  The upper part of the engine 20 is covered with an engine cover 30, and a seat 31 is installed thereon. A front cover 32 incorporating various operation mechanisms is provided in front of the seat 31, and a steering member 34 for steering the front wheels 10 and 10 is provided above the front cover 32. Reference numeral 35 denotes a hand shaft. A reservoir tank 16 is provided in the front cover 32 and is connected to the HST 23 by a pipe 19 so that oil is supplied to the HST 23 from a high position.

A planting elevating lever 33 for setting the elevating / lowering of the planting device 4 is provided on the right side of the steering member 34.
On the left side of the steering member 34, a speed change lever 36 for setting the forward, reverse, speed, etc. of the traveling vehicle body 2 is provided.

The engine cover 30 and the front cover 32 have horizontal floor steps 37 on the left and right sides of the lower end.
A plurality of through holes are formed in the left and right front portions of the floor step 37, so that a driver who is seated on the seat 31 and controls the aircraft can see the left and right front wheels 10 and 10 and is easy to control. At the same time, the mud on the shoes of the worker walking in the step 37 falls on the field.

  The elevating link device 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. These links 40, 41, 41 are pivotally attached to a rear-view portal-shaped link base frame 42 erected on the rear end of the main frame 15, and a vertical link 43 is connected to the tip side. ing. And the connecting shaft 44 rotatably supported by the planting apparatus 4 is inserted and connected to the lower end part of the vertical link 43, and the planting apparatus 4 is connected so that rolling is possible centering | focusing on the connecting shaft 44.

  A lifting hydraulic cylinder 46 whose base is pivotally supported on the main frame 15 is connected to a leading end of a swing arm (not shown) integrally formed with the upper link 40. By expanding and contracting with hydraulic pressure, the upper link 40 rotates up and down, and the planting device 4 moves up and down while maintaining a substantially constant posture. In addition, left and right auxiliary steps 28 and 28 are provided as steps for placing a foot when an operator gets on and off the aircraft.

(Swivel interlocking control)
For turning traveling in the field, the planting device 4 is controlled to move up and down to a non-working height position in conjunction with the turning of the steering wheel 34 as a steering member by an auto lift function, and according to the traveling state of the field. Thus, the elevation height is changed, and the driving power of the left and right front wheels 10, 10 and the left and right rear wheels 11, 11 is controlled.

  Specifically, the traveling power of the front wheels 10 and 10 is transmitted through the front wheel final cases 13 and 13 on the left and right sides through a differential device 51 with a differential lock mechanism 51a integrally formed with the transmission case 12, and the fuselage. The differential lock mechanism 51a is actuated by slipping of the front wheels 10, 10 during turning so that both wheels can be driven at the same speed.

  The left and right rear wheel gear cases 18, 18 are individually raised according to the driving force of each rear wheel 11 with the left and right swing support shafts 18 b, 18 b provided at the rear end of the main frame 15 as fulcrums. Support the swing. This swing support is configured such that the rear wheel gear case 18 rises in a predetermined angle range in response to a reaction force moment acting in accordance with the driving force of the rear wheel 11. In addition, the left and right rear wheel gear cases 18 and 18 receive the shifting power from the transmission case 12 from the left and right rear wheel transmission shafts 18a and 18a, and are provided with clutch mechanisms 18c and 18c, respectively, to control the operation of the clutch mechanisms 18c and 18c. Thus, the power transmission to the left and right rear wheels 11, 11 can be stopped.

  The operation of the left and right clutch mechanisms 18c, 18c, as shown in the enlarged view of the main part with a partial side view of FIG. 3, is a reverse link 34a that rotates in the opposite direction to the rotation of the handle 34 that is a steering member. The left and right control rod members 52, 52 acting only on the inside of the turn in conjunction with the steering operation are provided so as to be individually controllable. Each of these control rod members 52 is formed with a floating long hole 52h having a predetermined length for limiting the range of action on the input arm 18e for operating each clutch mechanism 18c. The clutch mechanism 18c is configured to be operable within a predetermined steering angle range.

  In addition, a clutch setting mechanism 53 for setting the left and right clutch mechanisms 18c, 18c so as to drive the left and right rear wheels 11, 11 also by a turning operation of the handle 34 is constituted by a guide cable 54. Specifically, the left and right control rod members 52 and 52 are provided with expansion / contraction portions 52c that allow relative movement between both end portions 52a and 52b, respectively. A guide cable 54 is installed so that the support position of the outer guide 54g can be moved with the expansion / contraction part 52c interposed therebetween, and the expansion / contraction part 52c can be restrained by the tension of the guide cable 54.

  As shown in the enlarged side view of the main part with a partial plan view of FIG. 4, a switching operation member 55 is provided at the terminal end side of both the cables 54, 54. The switching operation member 55 is connected to two arms 55a and 55a which are pivotally supported by the shaft 56 of the saddle clutch lever and are integrally provided on the boss portion 55b. A lever guide 57 formed with guide grooves 57a and 57b for holding the switching operation member 55 at the angular positions A and B corresponding to tension and relaxation as the positions of “standard” and “wet paddy” is provided. A lever position detecting member 58 such as a limit switch is provided at the relaxed position B so that the setting state of the clutch setting mechanism 53 can be notified.

  The planting device 4 is controlled so that it can be raised to the non-working height position by the lifting link mechanism 3 in accordance with the steering wheel operation at the time of turning the aircraft, and as shown in the system block diagram of the lifting control in FIG. The lift valve 3v is configured to be controllable using the operation signals of the sensor 3h and the differential lock mechanism 51a as control inputs. When the front wheels 10 and 10 slip when turning in a wet field or the like, as shown in the flowchart of FIG. 6, the first processing step (hereinafter abbreviated as “S1”) for operating the diff lock 51a is performed. The rising restriction mechanism is configured by the control process of the control unit C that drives and controls the elevating valve 3v (S3, S4) up to a separately determined upper limit (for example, 40 cm) by the determination of the rising start of the planting device 4 (S2). To do. This ascent restriction mechanism may be constituted by a limit switch provided at a predetermined height position.

  When the switching operation member 55 of the clutch setting mechanism 53 is held at the tension position A, which is the “standard” position of the lever guide 57, the seedling transplanting machine 1 having the above-described configuration causes the left and right control rod members 52, Since the expansion / contraction part 52c of 52 is restrained, when the vehicle body is turned by the turning operation of the handle 34, the clutch mechanism 18c inside the turning is operated and the power transmission of the corresponding rear wheel 11 is stopped, while the switching operation is performed. When the member 55 is operated to the relaxation position B, which is the “wet paddy” position, the restriction of the expansion / contraction portions 52c of the left and right control rod members 52, 52 is released by the relaxation of the cable 54. In addition, the propulsive force by both rear wheels 11 and 11 is maintained without the clutch mechanism 18c on the inner side of the turn being operated.

  Further, when the front wheels 10 and 10 slip during turning, the differential lock mechanism 51a of the differential device 51 is actuated and the front wheels 10 and 10 are driven at the same speed to maintain the propulsive force, and the differential lock mechanism 51a is activated. In conjunction with this, the ascending position of the planting device 4 is suppressed to a position lower than the non-working height, so that the output loss of the ascending drive is suppressed and the driving propulsion force is ensured without causing a decrease in the power supply of the traveling system. In addition, running is stable even in swamps and wetlands.

  Therefore, by driving only the rear rear wheel 11 on the outer side of the turn when the switching operation member 55 is set at the tension position A, it is possible to ensure turning with a small radius in a standard field, and to the relaxed position B. By driving both rear wheels 11 and 11 when set, it is possible to ensure traveling performance in a wet field with a large traveling resistance, and thus a clutch setting mechanism having a simple configuration including a switching operation member 55 that can be easily switched. 53, it is possible to ensure the turning performance of the wet field while ensuring the standard turning ability of the farm field, and adjusting the propulsive force and engine power of the front wheels 10 and 10 according to the situation of the turning farm field. By adjusting the distribution, it is possible to improve the traveling performance when the wetland turns.

  As described above, when the clutch mechanism 18c is operated and the rear wheel 11 inside the turn becomes non-powered, the difference between the rotation speeds of the rear wheels 11 and 11 inside the turn becomes large and the turn start position and the turn end are finished. Since the distance of the position can be shortened, the planting rows of the adjacent seedlings are hardly separated from each other, so that the seedling planting accuracy is improved.

On the other hand, if applied when the soil quality of the field is soft and the rotation of the rear wheel 11 inside the turn is hindered due to the improved traveling performance during swamp turning, the airframe is prevented from stopping during turning and the work efficiency is improved. improves.
Further, when the front wheels 10 and 10 slip during turning, the differential lock mechanism 51a automatically operates and the rotation of the front wheels 10 and 10 on the inside and outside of the turning synchronizes, so the soil quality of the field is soft and propulsion of the front wheels may be hindered. Even if it exists, it is prevented that the front wheels 10 and 10 are idle and cannot move, and the running does not stagnate or stop during turning, so that the work efficiency is improved.

  In addition, since the elevating link mechanism 3 is stopped at a predetermined height by the ascent restriction mechanism C in conjunction with the front wheel slip at the time of turning, the drive output consumed for raising the planting device 4 is reduced. Sufficient output is supplied, and the running of the machine is not hindered at the end of the field, improving work efficiency.

  When the setting of the rear wheel clutch mechanism is switched by the switching operation member 55, when the switching detection member 58 is in a detection state by the operation of the switching operation member 55, the notification member 59 by a buzzer, a lamp, or the like is activated, so that the soil quality of the field is increased. Since the operator can be aware of the softness, the operator can perform operations corresponding to soft soil fields and stabilize the seedling planting running posture, so that planting accuracy and work efficiency are improved.

  The ascending operation of the planting device 4 at the time of turning is configured to stop the planting device at a predetermined height corresponding to the operation of the diff lock mechanism 51a, so that the planting device 4 turns without contacting the field scene. At this time, since the driving output spent for raising and lowering the planting device 4 is reduced, sufficient output is supplied for the turning operation, and the traveling of the machine body is not hindered at the field end, and the work efficiency is improved. .

(Rear wheel slip detection)
Next, travel transmission control based on detection of rear wheel slip will be described.
As shown in the enlarged side view of the main part of FIG. 7, the rear wheel gear case 18 that is supported by swinging is lifted by the swinging motion of the rear wheel gear case 18 by the reaction force moment when the driving force F of the rear wheel 11 is large. On the other hand, when the rear wheel 11 slips, the driving force is suppressed and the rear wheel gear case 18 does not swing. Therefore, the swing sensor 18s for detecting the swing operation of the rear wheel gear case 18 is supported by the left and right swing supports. It is provided in the vicinity of the shafts 18b and 18b.

  If there is no detection by the swing sensor 18s outside the turn from the start of turning to the end of turning of the machine body, the differential lock mechanism 51a is controlled to operate, so that the rear wheel 11 slips. As a result, the propulsive force of the front wheels 10 and 10 can be ensured, so that the traveling performance when the wetland turns can be improved.

(Auto return cable)
Next, the auto return cable for setting the ascent limit of the planting device 4 will be described.
The auto return cable 61 of the planting device 4 is a guide cable connected to the control input cam 62 of the hydraulic lifting valve arranged in the bonnet, as shown in the perspective view of the main part of FIG. By acting on the control input cam 62 by being tensioned by the ascending operation of the elevating link mechanism 3, the ascending operation of the elevating link mechanism 3 is stopped and its upper limit position is defined. In order to switch the tension position, which is the upper limit position, up and down, the outer guide 61g is connected to the lever member 63, and one end of the lever member 63 is pivotally supported by the fulcrum 63p. It can be held in

  Since the automatic return cable 61 having the above-described configuration switches the upper limit position of the automatic raising of the planting device 4 according to the tension position of the guide cable 61 that changes according to the holding position of the lever member 63, the high holding position of the lever member 63. Switching the upper limit position of the automatic ascent of the planting device 4 when turning the aircraft, with A as the non-working height due to the “standard” turning and the low holding position B as a predetermined low position (eg 40 cm) due to the turning of the “humid field” Since setting is possible, output loss at the time of turning can be prevented by selecting “Wet field”.

(Seedling reduction detection control)
Next, the control at the time of seedling reduction of the planting apparatus 4 will be described.
The planting device 4 is provided with a seedling detection member 4s for detecting the presence or absence of seedlings, and in the state where there is no seedlings at the time of turning, the detection of the elevation height by the elevation position detection member 3h is stopped, so that the elevation height is not restricted. The planting device 4 is configured to be raised to a normal non-working height position.

  Thus, when there is no seedling in the planting device 4, under the situation where the weight of the planting device 4 is light and the power load is small by the configuration in which the lifting restriction of the lifting link mechanism 3 during turning is canceled. Since it can be swung up sufficiently from the field scene, the lower part of the planting device 4 is prevented from coming into contact with the field scene during swirling of the wet field.

(Elevating lever)
In the turn interlocking control abbreviated as Z-turn, in order to reliably replant the planting device 4 at the end of the turn, as shown in the side view of the support structure of the lift lever 33 in FIG. The arm 72 of the motor 71 that operates the possible lifting lever 33 is connected by the long hole link 73, and the lifting lever 33 is moved to the planting lowering position while allowing manual operation of the lifting lever 33 in the planting raising position. Thus, the motor 71 is configured not to return from the “lowering” position of the elevating lever 33 of the planting device 4 to the “planting” position.

  Specifically, as shown in the flowchart of FIG. 10, the control of the lift lever starts planting in a state where the motor 71 is planted by application of the Z-turn turning interlock control, and continues to the straight traveling (S11). By the steering operation (S12), the rotation control of the left and right rear wheels 11, 11 is started together with the hydraulic control (S13) for raising the planting device 4 (S14), and when the rotation is less 0.4 rotation (S15) The motor 71 is driven from planting to planting down (S16), and then the motor 71 is planted by planting motor drive (S18) when the rear wheel rotation is less than 0.95 (S17). The control process is configured to return to the additional position (S19).

  By the above control, the motor does not return upward during planting (S16) to planting (S18), so the steering wheel operation is delayed from the planting to the start of planting at the end of turning. Even if the lift is started, the planting device 4 can be prevented from rising and planting can be started. Therefore, as in the past, in order to resume planting at the end of turning, the motor is returned once between the “down” position of the planting device 4 and the planting “on” position. If the return operation of the handle 34 is delayed, the problem that the planting device 4 rises again by the auto lift function can be solved.

  Further, in the above configuration, in order to adjust the planting start position between the “down” position of the planting device 4 and the planting “on” position as shown in the flowchart of FIG. By releasing the planting position dial (S21), the motor is returned (S22), so that it is possible to cope with the case where the manual operation of the lifting lever 33 for raising the hydraulic pressure is necessary.

  Further, as shown in the enlarged sketch of the dial guide in FIG. 12, the planting position dial 75 does not return whether the motor 71 is returned during the period from planting down to planting in addition to the setting of the planting position 75a. By providing a release position 75b so that the release position 75b can be selected, and by configuring the release position 75b so that a lever can be fixed and a free position can be selected, it is possible to perform switching according to the prior dial setting of the planting position dial 75.

  In addition, as shown in the sketch of the operation panel in FIG. 13, a switch 76 for switching between fixed and free can be separately provided for switching the release position 75b. Setting is possible.

DESCRIPTION OF SYMBOLS 1 Seedling transplanter 2 Traveling vehicle body 3 Lifting link mechanism 3h Lifting position detection member (lifting position sensor)
4 planting device 4s seedling detection member 10 front wheel 11 rear wheel 18 rear wheel gear case 18b swing support shaft 18e input arm 18s swing sensor 33 lift lever 34 handle (steering member)
34a Reverse link 46 Elevating hydraulic cylinder 51 Differential device 51a Differential lock mechanism 52 Control rod member 52c Telescopic part 52h Sliding slot 53 Clutch setting mechanism 54 Guide cable 55 Switching operation member 57 Lever guide 58 Lever position detection member 59 Notification member A Tension position (High holding position)
B Relaxing position (low holding position)
C Ascent control mechanism F Driving force

Claims (6)

A traveling vehicle body (2) provided with left and right front wheels (10, 10) and left and right rear wheels (11, 11) traveling on a farm field, and a differential lock mechanism (tuned) for transmitting power of the left and right front wheels (10, 10) synchronously. 51a), a left and right clutch mechanism (18c, 18c) for releasing transmission of the power of the left and right rear wheels (11, 11), and the inside of the turn according to the turning operation of the body Left and right control rod members (52, 52) acting only on the clutch mechanism (18c, 18c), and a planting device (4) supported so as to be lifted to a non-working position by the lift link mechanism (3) in accordance with the turning operation of the machine body )
A clutch setting mechanism (53) is provided for setting the left and right rear wheel power so that the left and right rear wheel power can be maintained by restricting the operation of the left and right clutch mechanisms (18c, 18c), and the differential lock mechanism ( The differential device (51) is configured to be operable 51a), and the lift restricting mechanism (C) that keeps the rising position of the planting device (4) low by the operation of the differential lock mechanism (51a) is provided with the lift link mechanism (3 A seedling transplanting machine characterized in that it is provided in).   The left and right control rod members (52, 52) are provided with a stretchable portion (52c) that allows relative movement between the two end portions, and a tension erection guide that restricts the relative movement of each stretchable portion (52c). The clutch setting mechanism (53) is configured by a switching operation member (55) which is provided with a cable (54) of a type and is connected to both the cables (54, 54) and is switched and held so as to be able to be relaxed. The seedling transplanter according to claim 1.   A switching detection member (58) that detects the operation position by detecting the position of the protruding contact body provided on the switching operation member (55) is provided, and an operation position (B) that restricts the operation of the left and right clutch mechanisms (18c, 18c). The seedling transplanter according to claim 1 or 2, further comprising a notifying member (59) for notifying an operator in the case of (1).   The left and right rear wheels (11, 11) reach a predetermined height position while swinging and supporting the support height position so that the rear wheel gear case (18, 18) rises according to the respective driving forces. Swing detection members (18s, 18s) are provided to detect that the diff lock mechanism (51a) is provided when the movement detection member (18s) outside the turn does not detect a predetermined high position within a predetermined time range from the start of the turn. The seedling transplanter according to any one of claims 1 to 3, wherein the seedling transplanter is operated.   An elevating height detecting member (3h) for detecting the elevating height of the elevating link mechanism (3) and a diff lock detecting member (51s) for detecting the operation of the diff lock mechanism (51a) are provided, and the diff lock mechanism (51a) The seedling transplanting machine according to any one of claims 1 to 4, wherein the lifting link mechanism (3) is lifted and stopped at a predetermined height lower than the non-working height during operation.   The planting device (4) is provided with a seedling detection member (4s) for detecting the presence or absence of a seedling, and when there is no seedling, the detection of the planting height by the elevation height detection member (3h) is stopped. The seedling transplanter according to claim 5.

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