JP2013112277A5 - - Google Patents

Description

Seedling transplanter

  The present invention relates to a riding-type work vehicle in which a work device such as a seedling planting device is connected to a traveling vehicle.

  In conventional work vehicles, the left and right side wheels on the inside of the turn are intermittently turned on and off by controlling the electromagnetic valve, and the drive wheels are intermittently supplied to the rear wheels on the inside of the turn to rotate the left and right There is a technique for driving a rear wheel to make a turn. (Patent Document 1) Further, the side clutch inside the turning which is turned off during the turning operation is operated, the spring provided at the front part of the side clutch mechanism is extended by operating the switching operation pedal, and the state is turned on via the linkage mechanism. Thus, there is a technique for turning while driving the left and right rear wheels. (Patent Document 2)

JP 2010-263803 A Japanese Patent No. 4454141

  The work vehicle described in Patent Document 1 has a configuration in which an electromagnetic valve is opened and closed at predetermined intervals during turning to turn on and off the side clutch, and the turning performance at the field end is high, and the work efficiency is improved. It is something that can be done. However, since the oil supply pipe for the electromagnetic valve, the cable for controlling the electromagnetic valve, and the like are arranged in a complicated manner, there is a problem that the structure of the machine body becomes complicated and the number of parts increases.

  Further, since the work vehicle described in Patent Document 2 is configured to transmit the extension of the spring to the side clutch mechanism via the rear linkage mechanism when the side clutch on the inside of the turn is engaged, the side clutch mechanism The length before and after becomes long, and there is a problem that a large space is required for installation.

  The present invention seeks to solve this problem.

The invention according to claim 1 is provided with a traveling wheel (11) in the traveling vehicle body (2), a switching transmission device (300) for turning on and off the driving force to the traveling wheel (11), and the switching transmission device ( 300), a switching shaft (300a) for turning on and off, an operating member (305) for operating the switching shaft (300a) , and a steering member (34) for steering the traveling vehicle body (2). due to the work, the working vehicle provided with a pivoting linkage mechanism (a) for switching operating the switching gear (300) by operating the operating member (305), in conjunction with the operation of the steering member (34) A turning interlocking member (306) that rotates, and a release operating member (307) is provided rotatably on the upper part of the turning interlocking member (306), and the release operating member interlocked with the turning interlocking member (306). (307) contacts the operation member (305) and the operation unit (305) is operated to be in the turning interlocking state, and the biasing member (317) for biasing the release operating member (307) in the direction in contact with the operating member (305) is released from the turning interlocking member (306). A release switching member (303) for operating the release operation member (307) in the swing interlocking state and the swing interlocking release state is provided, and the release switching member (303) and the release operation member ( 307) are connected by a traction member (304), and when the release switching member (303) is operated against the urging force of the urging member (317), the release operation member (307) releases the pivot interlocking state and The work vehicle is characterized in that the switching transmission device (300) is turned on.

According to a second aspect of the present invention , a contact body (308) is provided below the release operation member (307), and a contact portion (305a) with which the contact body (308) contacts is formed on the operation member (305). The work vehicle according to claim 1, wherein

According to a third aspect of the present invention, there is provided a turning arm (311) that turns in the front-rear direction in conjunction with the operation of the steering member (34), and the turning arm (311) and the turning interlocking member (306). Are connected by an interlocking operating rod (314), and when the operating angle of the steering member (34) becomes a predetermined angle or more, the interlocking operating rod (314) moves forward and the lower part of the turning interlocking member (306). Is rotated forward and the upper part is rotated rearward to bring the contact body (308) into contact with the contact portion (305a) to turn off the switching transmission device (300), and the steering member (34) When the operation angle becomes less than a predetermined angle, the interlocking operation rod (314) moves rearward and rotates the lower part of the turning interlocking member (306) rearward and the upper part forward, thereby the contact body (308). Contact part (3 And a working vehicle according to claim 2, characterized in that a configuration in which-in operation the switching gearing (300) is retracted from 5a).

The invention according to claim 4 is provided with an electromagnetic actuator (322) for rotating the turning interlocking member (306) in the front-rear direction in conjunction with the turning operation of the steering member (34), and the electromagnetic actuator (322) includes: When the operation angle of the steering member (34) is equal to or greater than a predetermined angle, the lower part of the turning interlocking member (306) is rotated forward and the upper part is rotated rearward, thereby bringing the contact body (308) into contact portion (305a). And the switching transmission device (300) is turned off, and when the operation angle of the steering member (34) is less than a predetermined angle, the lower part of the turning interlocking member (306) is rotated backward and the upper part is rotated forward. by moving the contact body (308) a work according to claim 2 Symbol mounting, characterized in retracts it has a structure in which-in operation of the switching gear (300) from the contact portion (305a) It was both.

The invention according to claim 5 is provided with a rotation detection member (320) for detecting the rotation speed of the traveling wheel (11), and the rotation speed of the traveling wheel (11) detected by the rotation detection member (320) is a predetermined value. If less than, and the working vehicle according to claim 4 Symbol mounting, characterized in that said actuates the electromagnetic actuator (322) and configured to enter operating the switching gear (300).

(Delete)

According to the first aspect of the present invention, when the turning interlocking member (306) rotates in conjunction with the operation of the steering member (34), the biasing member (317) turns the release operating member (307) into the operating member (305). ), The driving force to the traveling wheel (11) is automatically cut off when the steering member (34) is turned, so that the release switching member (303) is turned off during the turning operation. There is no need to operate to switch off the switching transmission device (300), and the operability is improved .

When the release switching member (303) is operated, the release operation member (307) is pulled by the traction member (304) to switch to the turning interlock release state, thereby resuming driving of the traveling wheel (11) during turning. Therefore, the turning time is shortened and the work efficiency is improved.

Further, the biasing member (317) biases the release operation member (307) toward the operation member (305), so that when the release switching member (303) is not operated, the operation automatically switches to the swivel interlocking state. Therefore, the operation of switching the release operation member (307) from the turning interlock release state to the turning interlocking state is facilitated, and the operability is improved.

Furthermore, since the operation of switching to the turning interlocking state is forgotten and the turning trajectory is prevented from being disturbed, the work efficiency is improved.
As described above, by operating the release switching member (303), the switching transmission device (300) is switched on and off, and the driving force on the traveling wheel (11) is switched on and off. The switching mechanism provided between the member (306) and the traveling wheel (11) has a simple configuration.

Moreover, since the release operation member (307) for releasing the turning interlocking state is provided on the upper part of the turning interlocking member (306), the front-rear width of the switching operation mechanism of the switching transmission device (300) is shortened, so that a wide installation space is provided. Is no longer necessary.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the contact body (308) is provided at the lower portion of the release operation member (307) and the contact body (305) is provided on the operation member (305). 308) is in contact with the release operation member (307a) when the release operation member (307) is urged by the urging member (317) so that the contact position is stable. The device (305) is reliably turned on and off .

According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, when the operation angle of the steering member (34) becomes a predetermined angle or more, the interlock operation rod (314) is turned to the pivot interlocking member ( By rotating the lower part of 306) forward and the upper part backward, the contact body (308) provided on the release operation member (307) is surely brought into contact with the contact part (305a) of the operation member (305). Therefore, during turning, the transmission of the driving force from the switching transmission device (300) to the traveling wheel (11) is reliably cut off .
Further, when the operation angle of the steering member (34) is less than a predetermined angle, the interlocking operation rod (314) rotates the lower part of the turning interlocking member (306) backward and the upper part forward, whereby the contact body (308). Since the driving force is reliably transmitted from the switching transmission device (300) to the traveling wheel (11) when the turning traveling is completed, the operability is improved.

The effect of the invention according to claim 4 is that, in addition to the effect of the invention according to any one of claims 1 to 3 , the electromagnetic actuator (322) is activated when the operation angle of the steering member (34) becomes a predetermined angle or more. By rotating the lower part of the swivel interlocking member (306) forward and the upper part rearward, the contact body (308) provided on the release operation member (307) is securely connected to the contact part (305a) of the operation member (305). Therefore, during the turning traveling, the transmission of the driving force from the switching transmission device (300) to the traveling wheel (11) is surely cut off .

Further, when the operation angle of the steering member (34) becomes less than a predetermined angle, the interlocking operation rod (322) rotates the lower part of the turning interlocking member (306) backward and the upper part forward, whereby the contact body (308). Since the driving force is reliably transmitted from the switching transmission device (300) to the traveling wheel (11) when the turning traveling is completed, the operability is improved.

The effect of the invention according to claim 5 is that, in addition to the effect of the invention according to claim 4, when the rotational speed of the traveling wheel (11) detected by the rotation detection member (320) becomes less than a predetermined value, the electromagnetic actuator (322) ) Is actuated to rotate the turning interlocking member (306), and the switching transmission device (300) is turned on and automatically switched to a state where the driving force is transmitted to the traveling wheel (11). The traveling is prevented from being interrupted, and the work efficiency is improved.

(Delete)

Side view of riding rice transplanter Top view of riding rice transplanter Side view of stacked seedling frames Side view of the spare seedling frame in the unfolded form Block diagram of each control member Side view of main part of side clutch mechanism Side view of main part of side clutch mechanism Side view of main part of side clutch mechanism of another configuration example Flowchart showing control for canceling the turn-linked interlocking state of the side clutch mechanism when a travel stop is detected during turning Flow chart showing control in which the amount of oil supplied to the lifting hydraulic cylinder temporarily increases when the hydraulic control of the power steering device is turned off (A) Main part front view in which a turning operation restricting mechanism is provided on the handle post, (b) Main part front view showing a state in which the turning operation restricting mechanism restricts the left-right rotation of the handle post. Flowchart showing control in which the turning operation restricting mechanism automatically slides to the restricting position when straight running continues The flowchart which shows the control which changes the oil feeding speed of the hydraulic oil to a raising / lowering hydraulic cylinder according to the change of the weight of a seedling planting part. Front view of essential parts of seedling planting part equipped with a rolling sensor that detects the rotation of the rolling shaft Flowchart showing control to reduce traveling speed when excessive seedling planting part rolling is detected within a predetermined time A flow chart showing a control for canceling the vertical movement by expanding and contracting the lifting hydraulic cylinder when detecting an excessive vertical movement of the seedling planting portion within a predetermined time. The flowchart which shows the control which changes the operation time of the trunnion shaft when operating the travel operation lever according to the opening degree of the trunnion shaft of the hydraulic continuously variable transmission The flowchart which shows the control which changes the oil feeding speed to a raising / lowering hydraulic cylinder according to the angular velocity of the elevation angle of a center float. Plan view of the main part of the display The flowchart which shows the control which displays the information that the leveling rotor is lowered too much on the display when the leveling rotor is overloaded

Embodiments of the present invention will be described with reference to the drawings.
In this case, in the plan view, the left side with respect to the advancing direction of the aircraft is referred to as the left and right sides of the aircraft, and the right side with respect to the advancing direction of the aircraft is referred to as the other sides of the aircraft. Details of each part will be specifically described below.

FIG.1 and FIG.2 is the side view and top view of the riding type rice transplanter which are one Example of the work vehicle of this invention. FIG. 5 is a block diagram of components relating to each control of the present invention.
In this riding type rice transplanter, a seedling planting portion 4 is provided on the rear side of the traveling vehicle body 2 via the lifting link device 3 so as to be movable up and down, and the main body portion of the fertilizer device 5 is disposed on the rear upper side of the traveling vehicle body 2. Yes. A transmission case 12 is provided at the front of the traveling vehicle body 2, front wheel final cases 13 and 13 are provided on the left and right sides of the transmission case 12, and the steering direction of the left and right front wheel final cases 13 and 13 is changed. A pair of left and right front wheels 10, 10 as drive wheels is provided on the left and right front wheel axles 14 projecting outward from each changeable front wheel support.

  A rear wheel rolling shaft (not shown) is fixed to the rear portion of the mission case 12 at the front end of the main frame 15 of the fuselage and provided horizontally at the rear end of the main frame 15 and at the center in the left-right direction. The left and right rear wheel gear cases 18, 18 are provided so as to be freely rollable with respect to the left and right rear wheel axles 18 a, 18 a projecting outward from the rear wheel gear cases 18, 18. Axis.

  Further, an engine 20 is provided at an upper portion of the main frame 15 and at a substantially central position in the front-rear and left-right directions of the airframe. A driving force of the engine 20 is supplied to a belt transmission 21 and an HST (hydraulic continuously variable transmission) 23 Through the transmission case 12. The rotational power transmitted to the transmission case 12 is shifted by a transmission (not shown) built in the transmission case 12 and then separated into traveling power and external extraction power.

  As a result, part of the driving force is transmitted to the left and right front wheel final cases 13 and 13 to drive the left and right front wheels 10 and 10 to rotate, and the remaining driving force is applied to the left and right rear wheel gear cases 18 and 10. The left and right rear wheels 11, 11 are driven to rotate.

  Further, the external take-out power is transmitted to a planting clutch case 25 provided at the rear part of the traveling vehicle body 2, and is transmitted from the planting clutch case 25 to the seedling planting unit 4 via the planting transmission shaft 26. At the same time, it is transmitted to the fertilizer application device 5 via a fertilizer transmission mechanism (not shown).

  A flat floor step 35 covering the main frame 15 is provided on the main frame 15 so as to avoid the engine 20, and an engine cover 30 covering the engine 20 is provided on the floor step 35 and on the outer periphery of the engine 20. The engine cover 30 is configured to be rotatable with a front lower portion as a rotation fulcrum, and a work seat 31 on which an operator sits is mounted on the upper portion.

  A bonnet 32 that houses various working mechanisms of the work vehicle is provided on the front side of the machine seat 31 and on the floor step 35, and switches for changing the setting of each working unit are provided above the bonnet 32. And a handle 34 for steering the left and right front wheels 10 and 10 by the operator.

  Further, in the floor step 35, the left and right sides of the work seat 31 are formed in a lattice shape so that mud adhering to an operator's feet moving on the floor step 35 falls to the field. Further, as shown in FIG. 2, left and right extension steps 35 a and 35 a are provided on both the left and right sides of the floor step 35, and the left and right extension steps 35 a and 35 a are formed in a lattice shape before reaching the work seat 31. It is configured such that mud is dropped and mud does not easily remain on the floor step 35, and labor required for cleaning after work is reduced.

  A rear step 36 that also serves as a fender for the left and right rear wheels 11, 11 is provided at the rear of the floor step 35. The rear step 36 has a rear-upward inclined posture part from the front side to the rear side of the machine body, and a flat part from the rear end part of the rear-upward slope position to the rear side of the machine body. When the seedling is replenished to the part 4, the work can be performed while standing on this flat portion, so that the efficiency of the seedling replenishing work is improved.

  In the present invention, the floor step 35 and the rear step 36 are inseparably formed by integrally forming a resin material, but the floor step 35 and the rear step 36 may be configured to be separable. If it is configured to be separable, when removing the floor step 35 and the rear step 36 during maintenance work, the weight of the floor step 35 and the rear step 36 is light, and it is difficult to interfere with the engine cover 30, etc. As a result, work efficiency is improved.

  Further, if the rear parts of the left and right extension steps 35a and 35a are formed in the same shape as the left and right rear steps 36 and 36, the number of planting strips is large and the width of the seedling planting part 4 is wide. Even so, the worker can approach the seedling planting unit 4 and perform the seedling replenishment work, so that the work efficiency is improved.

  Also, on both the left and right sides of the front part of the traveling vehicle body 2, spare seedling frames 38, 38 for placing the replenishment seedlings shown in FIGS. It is provided to be able to rotate at the position. The left and right spare seedling frames 38, 38 are provided with a plurality of preliminary seedling placement platforms 38a, 38b, 38c, 38d on which seedlings are placed, and the preliminary seedling placement platforms 38a, 38b, 38c, 38d are arranged in the front-rear direction in a side view. A configuration that can be switched between an unfolded form (first form) and a stacked form (second form) lined up and down.

  In this embodiment, the plurality of preliminary seedling platforms are referred to as first, second, third, and fourth preliminary seedling platforms from the front side of the machine body in the deployed form, and the first and second from the upper side of the machine body in the stacked form. It is called the second, third and fourth spare seedling platforms. However, this designation is presented as a reference and does not limit the number of spare seedling platforms.

  When planting seedlings, the left and right spare seedling frames 38, 38 are projected to the side of the aircraft so that the front side of the aircraft is between the left and right preliminary seedling frames 38, 38 and the bonnet 32. Since a space for the operator to get on and off from the traveling vehicle body 2 can be secured, the operator can select a position to get on and off according to the position of the farm field, and the work efficiency is improved, and at the time of getting on and off Safety is improved.

  On the other hand, when the work vehicle is stored in a transport vehicle such as a light truck or a storage location such as a warehouse after the work is completed, the left and right spare seedling frames 38 and 38 are rotated to move within the left and right width of the traveling vehicle body 1. Since the left and right widths can be made compact by being housed in, the extra storage space is not taken up.

The configuration of the preliminary seedling frame 38 will be described with reference to FIGS. 3 and 4.
The support body 381 is provided on each of the left and right sides of the traveling vehicle body 1, the main support frame 381a is provided on the top of the support body 381, and the L-shaped sub-support frame 381b is provided behind the main support frame 381a in a side view. Provide. A main link arm 383 is rotatably mounted on the upper end portion of the main support frame 381a via a rotation center shaft 384, and a rear side is connected to the upper end portion of the sub support frame 381b via a sub rotation shaft 385. The sub link arm 386b is rotatably arranged.

  Further, a fourth attachment frame 387d for attaching the fourth preliminary seedling stand 38d is provided at the lower end when the main link arm 383 and the sub link arm 386b are in a stacked state, and the rotation center shaft 384 and the sub rotation A third attachment frame 387c for attaching the third preliminary seedling table 38c is provided at a position above the shaft 385. Further, the rear side of the second attachment frame 387b for attaching the second preliminary seedling stand 38b to the upper end portion of the main link arm 383 is attached, and the front side sub link arm 386a is attached to the front side of the second attachment frame 387b. The upper end portion is attached and the lower end portion of the front side sub link arm 386a is attached to the front portion side of the third attachment frame 387c.

  Then, a rotation gear 388 is attached to the rotation center shaft 384, and a drive gear 389 attached to the electric motor 390 is engaged with the rotation gear 388, so that the rotation gear 388 and the electric motor 390 are transmitted to the seedling frame. Interior in case 391.

  Further, an attachment column 393 is provided at an upper portion of the second attachment frame 387b and at a substantially central position in the front-rear direction, and a first attachment frame 387a for attaching the first preliminary seedling stand 38a is attached to the upper end of the attachment column 393. . When the mounting column 393 is in a stacked form, the vertical interval between the first preliminary seedling stage 38a and the second preliminary seedling stage 38b is such that the second preliminary seedling stage 38b and the third preliminary seedling stage 38c and a length that is wider than the vertical interval between the third preliminary seedling table 38c and the fourth preliminary seedling table 38d. Further, when the preliminary seedling frame 38 is switched to the unfolded form, the first preliminary seedling stage 38a moves forward together with the second preliminary seedling stage 38b.

In addition, if it is set as the structure which provides the said mounting support | pillar 393 one each in the front-back direction of the 1st mounting frame 387a, support strength will improve and durability will improve.
As described above, when the electric motor 390 is actuated to rotate the drive gear 390 and the rotation gear 388 is rotated, the main link arm 383 and the front and rear sub-link arms 386a and 386b are stacked in the stacking direction. Since it is configured to rotate in the direction of the deployed form, the operator does not have to manually move the main link arm 383 and the like when switching the preliminary seedling frame 38 to the stacked form or the deployed form, and the labor of the operator Is reduced.

  In addition, as shown in FIG. 2, when the seedling frame operation switch 392 for turning on and off the operation of the electric motor 390 is arranged at the upper part of the bonnet 32 and reachable when the operator seated on the control seat 31 reaches the hand. Since the operator can perform the switching operation of the form of the preliminary seedling frame 38 without getting off the control seat 31, the work efficiency is improved.

  When the spare seedling frame 38 is switched to the unfolded form, the second, third, and fourth preliminary seedling frames 38b, 38c, and 38d are loaded in the second preliminary seedling frame 38b by being arranged in a straight line in the front-rear direction. When the seedling is pushed, it can be moved to the third or fourth spare seedling frame 38c, 38d on the rear side, so that the seeding loading efficiency is improved.

  Furthermore, since the first preliminary seedling stage 38a is positioned above the second preliminary seedling stage 38b, the operator can load seedlings on the first preliminary seedling stage 38a, so that the work efficiency is improved. In addition to the improvement, since the preliminary seedling frame 38 in the deployed form does not protrude too far forward, the preliminary seedling frame 38 is not bent during the seedling loading operation, and the seedling is prevented from being shaken off.

  Further, the vertical interval between the first preliminary seedling stage 38a and the second preliminary seedling stage 38b is set so that the second and third preliminary seedling bases 38b and 38c and the third and fourth preliminary seedling bases 38c are arranged. 38d, when the spare seedling frame 38 is switched to the stacked form or the deployed form, the first preliminary seedling stand 38a and the first mounting frame 387a are arranged on the rotation trajectory of the main link arm 383. Interference can be prevented.

  The electric motor 390 is equipped with a bimetal that bends due to temperature changes, or an energization interruption member that immediately interrupts energization when a load exceeding an allowable amount is applied, and includes a main link arm 383, front and rear sub link arms 386a, If the electric motor 390 is automatically turned off when a load is applied to the electric motor 390 when the 386b is in a laminated form or a deployed form and can no longer be rotated, the spare seedling frame 38 is in a loaded state or Since a stop control member such as a switch for stopping the electric motor 390 at the same time as the unfolded state is required, the switching operation mechanism of the preliminary seedling frame 38 is simplified.

Next, the seedling planting part 4 etc. are demonstrated.
As shown in FIGS. 1 and 2, the elevating link device 3 is a parallel link composed of an upper link arm 40 and a pair of left and right lower link arms 41, 41, and the upper link arm 40 and the lower link arms 41, 41 are connected to each other. One end of the main frame 15 is attached to a rear base type link base frame 42 erected on the rear side of the main frame 15. Further, the other end portions of the upper link arm 40 and the lower link arms 41 and 41 are attached to the vertical link arm 43 on the seedling planting portion 4 side. A rolling shaft 44 for vertically rotating the seedling planting portion 4 is provided at the rear portion of the vertical link arm 43.

  An elevating hydraulic cylinder 46 is provided between the support member fixed to the main frame 15 and the tip of a swing arm (not shown) integrally formed with the upper link arm 40, and the cylinder 46 is extended and contracted hydraulically. Thus, the upper link arm 40 is turned up and down so that the seedling planting part 4 is lifted and lowered in a substantially constant posture.

  By the above, since the seedling planting part 4 can be moved up and down with substantially the same posture, the seedling planting part 4 is raised at the time of turning at the end of the field, and the seedling planting part 4 is lowered after the turning is finished. If this is done, the planting posture is restored, so that fine adjustment operations are not necessary, and work efficiency is improved.

  As shown in FIGS. 1 and 2, in this case, the seedling planting unit 4 has an eight-row planting structure, and a plurality of (eight in the present embodiment) seedling placing bases 51a. The seedling tank 51 is configured by connecting in the direction. A seedling planting transmission case 50 that also serves as a frame of the seedling planting unit 4 is provided below the seedling tank 51, and the seedling tank 51 is reciprocated in the left-right direction by the driving force of the seedling planting transmission case 50. To do.

  Further, a plurality of seedling planting transmission cases 54 (4 in this embodiment) are mounted at equal intervals in the left-right direction, and the right and left sides of the seedling planting transmission cases 54 are mounted. The left and right planting devices 52, 52 are mounted for drawing seedlings and planting them on a farm field while drawing an elliptical locus on both sides and rotating.

  Further, an L-shaped seedling receiving plate 51c in side view for receiving the seedlings loaded in the seedling tank 51, which is longer in the left-right direction than the left-right width of the seedling tank 51, is provided at the lower end of the seedling tank 51, In the plate 51c, a plurality of seedling outlets 51d through which the seedlings 52, 52... Scrape the seedlings loaded on the seedling mounting table 50 are cut out (eight places in this embodiment). . Also, a pair of left and right seedling feeding belts 51b, 51b for moving the seedlings to the seedling receiving plate 51c side (the lower side of the seedling planting device 4) at predetermined intervals on each strip on the lower side in the vertical direction of the seedling tank 51. And a seedling replenishment detector 140 for detecting that the amount of loaded seedlings has become less than a predetermined amount is provided between each of the left and right seedling feeding belts 51b and 51b.

  The seedling replenishment detecting body 140... Recognizes that there is a seedling when the seedling placed on each seedling platform 51a... Sensor type. When the seedlings are sent to the left and right seedling feeding belts 51b, 51b, and the seedlings are planted and consumed by the left and right planting devices 52, 52, the seedlings placed on the seedling placing bases 51a are gradually reduced. I will do it. When the remaining amount of seedlings is below the installation position of the seedling replenishment detecting body 140..., The decrease in the number of seedlings is detected, and the notification device 141 such as the buzzer 141a or the lighting lamp 141b is operated to Notify that replenishment work is necessary.

According to the above, it is possible to prevent a worker from noticing that the seedling has been lost and to generate a section where the seedling is not planted, so that the seedling planting efficiency is improved.
Moreover, since the operator does not need to manually plant seedlings in places where seedlings were not planted, the labor of the workers is reduced.

  In the lower part of the seedling planting portion 4, a center float 55 is provided at a substantially central position in the left-right direction, and middle floats 57, 57 and side floats 56, 56 are provided on the left and right sides of the center float 55, respectively. The center float 55, the side floats 56 and 56, and the middle floats 57 and 57 are grounded to the mud surface of the field (the topsoil surface of the field) when the seedling planting unit 4 is lowered and the seedling planting operation is performed. , The center float 55, the side floats 56 and 56, and the middle floats 57 and 57 slide while leveling the mud surface. The front and rear lengths of the seedling planting transmission cases 54 and the planting locus of the seedling planting devices 52 are set so that the seedling planting devices 52 plant the seedlings on the ground level.

  The center float 55, the side floats 56 and 56, and the middle floats 57 and 57 are rotatably attached so that the front end side moves up and down according to the unevenness of the topsoil surface of the field. In particular, the mounting base of the center float 55 is provided with an elevation angle sensor (potentiometer) 331 that detects the vertical movement angle of the front portion of the center float 55, and matches the angle detected by the elevation sensor 331. The planting depth of the seedling is maintained constant by changing the opening of the proportional hydraulic valve 161 that controls expansion and contraction of the lifting hydraulic cylinder 46 and moving the seedling planting unit 4 up and down.

  According to the above, since the seedling can be planted at a place leveled by the center float 55, the side floats 56, 56 and the middle floats 57, 57, the soil height around the seedling is less likely to be biased, and the growth of the seedling is reduced. Stable and improved crop quality.

  And since the planting depth of a seedling can be stabilized by raising / lowering the seedling planting part 4 according to the vertical angle of the center float 55 which the elevation sensor 235 detects, the planting depth of a seedling is shallow. Since the seedlings are prevented from being washed away by the flow of water stretched over the field and the seedlings being blown off by the strong wind, crop yield is improved.

  In addition, since the planting depth of the seedling becomes too deep and it is possible to prevent the growth of the crop from being disturbed due to insufficient sunshine or excessive water, the quality of the crop can be improved and the seedling can be prevented from withering after planting.

  The fertilizer application device 5 feeds the granular fertilizer stored in the fertilizer hopper 60 from a plurality of sections (eight sections in this case) feeding portions 61..., And feeds the fertilizer into a plurality of sections (eight sections in this case). The fertilizer hose 62 ... guides the fertilizer guides (not shown) attached to the left and right sides of the center float 55, side floats 56, 56, and middle floats 57, 57, and the grooved body provided on the front side of the fertilizer guide ... (Illustration omitted) ... It is set as the structure dropped into the fertilization groove formed in the side part vicinity of a seedling planting strip.

  Also, wind generated by the blower 58 driven by the blower electric motor 53 is blown into the fertilizer hose 62 through the air chamber 59 that is long in the left-right direction, and the fertilizer in the fertilizer hose 62 is blown by wind pressure. It is configured to forcibly convey.

  By the above, granular fertilizer can be dropped into the groove formed by the grooved body at the planting position of the seedlings of each strip, so that the fertilizer is prevented from moving to a position away from the seedlings by water flow or wind, However, due to lack of fertilizer, it does not cause poor growth and the growth of the crop is stable.

In addition, the fertilizer can be gathered in one place to prevent the occurrence of poor growth caused by excessive nutrients, and it is possible to prevent only some crops from growing rapidly and disturbing the harvest time, thus stabilizing the quality of the crop.
The seedling planting part 4 is provided with a center rotor 27a, which is an example of a leveling device, and a pair of left and right side rotors 27b, 27b. In addition, the connected seedling platforms 51 are configured to slide in the left-right direction using a support roller 65a of a rectangular support frame body 65 that is a full width in the left-right direction and the up-down direction that supports the entire seedling planting unit 4. It is said.

  The center rotor 27a and the left and right side rotors 27b and 27b are respectively provided with a beam member whose upper ends are rotatably supported by both side members 65b of the support frame 65 of the seedling platform 51, and at both ends of the beam member. It is supported by a support structure portion comprising a fixed support arm and a rotor support frame rotatably attached to the support arm. The drive shafts 70a and 70b of the center rotor 27a and the side rotors 27b and 27b are attached to the lower end of the rotor support frame. Further, the lower end portion of the rotor support frame 68 is connected to a connecting member 71 rotatably attached to the seedling planting transmission case 50.

  A center rotor 27a is arranged in front of the center float 55, and the center float 27a is arranged in front of the side rotors 27b and 27b arranged in front of the side floats 56 and 56 and middle floats 57 and 57. . Further, the rear wheel gear case 18 on the left and right sides, in this case, the left side of the fuselage and the rotor input case (not shown) of the left side rotor 27b are connected by a rotor transmission rod 27c, and the center rotor 27a and the left and right side rotors are connected. The driving force is transmitted to 27b and 27b.

  The drive shaft input to the rotor input case from the left rear wheel gear case 18 via the rotor transmission rod 27c rotates the drive shaft 70b of the left side rotor 27b, and the left and right side rotors 27b, 27b Of the left and right leveling transmission cases 73 and 73 that connect the center rotor 27a, the drive shaft 70a of the center rotor 27a is rotated via the left leveling transmission case 73. Then, the rotary shaft 70b of the left side rotor 27b is rotated from the drive shaft 70a via the right leveling transmission case 73.

The seedling planting unit 4 is mounted on the main frame 15 of the traveling vehicle body 2 so as to be movable up and down by the lifting link device 3. The configuration for raising and lowering and the configuration of the seedling planting unit 4 will be described.
The upper end of the piston of a hydraulic cylinder 46 whose base side is rotatably provided on the traveling vehicle body 2 is connected to the lifting link device 3, and hydraulic oil is supplied to the hydraulic cylinder 46 by a proportional hydraulic valve 161 provided on the traveling vehicle body 2. The seedling planting part 4 connected to the lift link device 3 is moved up and down by discharging and extending and contracting the piston of the hydraulic cylinder 46.

  As shown in FIGS. 6 and 7, the upper ends of the left and right clutch operation arms 301, 301 are rotatably provided in the bonnet 32 so as to be tilted forward and upward from the rear side to the front side of the machine body. Left and right pedal plates 302, 302 that are operated by the operator placing their feet on the lower ends of the operation arms 301, 301 are attached to the outside of the bonnet 32, respectively, to transmit driving force to the left and right rear wheels 11, 11. Left and right clutch operation pedals 303 and 303 for operating the left and right side clutches 300 and 300 to be switched are formed. Then, one side ends of the left and right clutch operation wires 304 and 304 are attached to the upper ends of the left and right clutch operation arms 301 and 301.

  In addition, left and right clutch shifter arms 305 and 305 are attached to the switching operation shafts 300a and 300a of the left and right side clutches 300 and 300 via square shafts 305b and 305b, respectively. In addition, left and right rotating bosses 306c in which left and right lower linkage arms 306a and 306a that rotate in conjunction with the turning operation of the handle 34 are welded to one side (the right side of the machine body) are attached to the left and right switching operation shafts 300a and 300a. , 306c. Then, left and right upper linkage arms 306b and 306b are welded to the other side portions (left side of the machine body) of the left and right rotation bosses 306c and 306c to constitute left and right linkage arms 306 and 306, respectively.

  Further, left and right switching operation arms 307 and 307 for turning the left and right side clutches 300 and 300 on and off by turning the left and right clutch shifter arms 305 and 305 up and down at the upper ends of the left and right upper linkage arms 306b and 306b, respectively. It can be pivoted. The rotation fulcrums 307a and 307a of the left and right switching operation arms 307 and 307 are provided at intermediate positions in the vertical direction.

  The left and right switching operation shafts 300a and 300a are in a state in which no load is applied to the left and right clutch shifter arms 305 and 305 due to the force of a return spring (not shown) built in the left and right side clutches 300 and 300. It is assumed that the left and right clutch shifter arms 305 and 305 rotate slightly upward.

  Flat portions 305a are formed on the rear and upper surfaces of the left and right clutch shifter arms 305 and 305, respectively, and the left and right flat portions 305a and 305a are formed at the lower ends of the left and right switching operation arms 307 and 307, respectively. Contact rollers 308 and 308 for contacting and rotating the left and right clutch shifter arms 305 and 305 in the vertical direction are provided. Further, the other end portions of the left and right clutch operation wires 304 and 304 are connected to the upper ends of the left and right switching operation arms 307 and 307, respectively.

  Then, one end (rear end) of the left and right springs 317 and 317 is attached to the end of the rotation shafts 307b and 307b of the left and right contact rollers 308 and 308. Side end portions (front end portions) are attached to hooking projections 306d and 306d formed on the lower end portions of the left and right upper linkage arms 306b and 306b.

The left and right springs 317 and 317 have an urging force that pulls the left and right switching operation arms 307 and 307 forward.
Furthermore, a handle rod 34a that rotates in the left-right direction by the operation of the handle 34 is provided, and a power steering device 309 that reduces the force required for the operation of the handle 34 is provided at the lower end of the handle rod 34a, and the power steering mechanism 309 is provided. A turning interlocking mechanism 310 that rotates the handle 34 in association with an operation in the left turning direction or the right turning direction is provided below the turning mechanism. The left and right pivot arms 311 and 311 that pivot in the front-rear direction in conjunction with the operation of the handle 34 are provided at the left and right lower portions of the pivot interlock mechanism 310, and the rear sides of the left and right pivot arms 311 and 311 are provided. The left and right side clutch operating devices 316 and 316 are configured by connecting the lower portion and the lower ends of the left and right lower linkage arms 306a and 306a with left and right interlocking operating rods 314 and 314, respectively.

The left and right linkage arms 306 and 306, the left and right turning arms 311 and 311, and the left and right springs 317 and 317 are referred to as a turning interlock mechanism A.
The left and right side clutch operating devices 316 and 316 operate as follows, and “disconnect” the left and right side clutches 300 and 300 on the side located inside the turn.

  When the handle 34 is operated in the left or right turning direction by a predetermined angle or more, the turning arm 311 inside the turning rotates forward, and the interlocking operation rod 314 moves forward of the body, and the lower end side of the linkage arm 306 is moved. When the (lower linking arm 306a side) rotates forward, the upper end side rotates backward when the lower end side of the linking arm 306 rotates forward. Then, the spring 317 pulls the lower side of the switching operation arm 307 to the front side of the fuselage by its urging force, and the contact operation roller 308 provided on the lower side is rotated by the switching operation arm 307 so that the upper part on the rear side of the clutch shifter arm 305. In contact with the flat portion 305a formed on the substrate.

  As a result, the clutch shifter arm 305 is pushed down by the contact roller 308, the switching operation shaft 300a is turned to the turning operation side, the side clutch 300 is turned off, and the driving force to the rear wheel 11 inside the turning is cut off. The When turning left, the left side members perform the above operation and the left side clutch 300 is turned off. When turning right, the right side members perform the above operation and the right side clutch 300 is turned off.

  Further, when the operation angle of the handle 34 reaches the turning end (straight running) angle, the rotating arm 311 rotates backward, and the interlocking operation rod 314 moves rearward of the machine body to move to the lower end side (lower link) of the linkage arm 306. The arm 306a side) rotates backward. When the lower end side of the linkage arm 306 rotates backward, the upper end side (upper linkage arm 306b side) rotates forward, and the switching operation arm 307 and the contact roller 308 move upward to retract from the clutch shifter arm 305. Therefore, there is no force to push down the clutch shifter arm 305, the switching operation shaft 300a is turned to the on operation side by the force of the return spring (not shown), the side clutch 300 is in the on state, and the rear wheel inside the turn 11 is supplied with driving force.

  With the above configuration, the side clutch 300 on the inside of the turn can be automatically turned on and off in conjunction with the operation of the handle 34 at the time of turning, so the clutch operation pedal 303 on the side corresponding to the turning direction can be operated. There is no need to keep operating, the operation is simplified, and the operability is improved.

  In addition, since it is possible to prevent the operation of the clutch operating pedal 303 from being repeated and turning again or continuing the operation while the turning locus is disturbed, the work efficiency is improved and the planting positions before and after the turning are easily aligned. Therefore, the seedling planting accuracy is improved.

  Furthermore, when the turning trajectory is disturbed, it is possible to prevent the seedling already planted in the field from being crushed, so there is no need to replant the seedling, the amount of seedling is reduced, and the operator can plant the seedling. Time and labor required for repair work are reduced.

  By the above, a seedling transplanter that can improve the operability during turning and the planting accuracy before and after turning can be realized, but when the soil soil is strong or the depth from the surface to the tiller is deep Rotation of the front wheels 10 and 10 and the rear wheels 11 and 11 may be hindered by mud to prevent turning movement, or a deep turning trace may be formed at the field edge.

  In order to solve this problem, an electronic control mechanism that intermittently turns on and off the side clutch 300 inside the turn when the handle 34 is operated is introduced, and the left and right rear wheels are driven by intermittently turning on and off the side clutch 300. There are seedling transplanters with the ability to swivel. However, when an electronic control mechanism is used, there is a problem that the structure becomes complicated and the cost increases.

  In the present invention, as shown in FIGS. 6 and 7, one side end of the left and right clutch operation wires 304, 304 is provided on the upper end side of the left and right clutch operation arms 301, 301 constituting the left and right clutch operation pedals 303, 303. The other end portions of the left and right clutch operation wires 304 and 304 are attached to the upper end portions of the left and right switching operation arms 307 and 307, respectively.

  As a result, when the driving force of the rear wheel 11 inside the turn is required during turning, the spring 317 can resist the force that the spring 317 urges the lower end side of the switching operation arm 307 when turning. When stepping with force, the spring 317 expands and the upper end side of the switching operation arm 307 rotates forward about the rotation fulcrum 307a and the lower end side provided with the contact roller 308 rotates rearward. The contact roller 308 is separated upward from the flat portion 305a of the clutch shifter arm 305, and the switching operation shaft 300a is switched to the input operation side. For this reason, it is possible to drive the rear wheel 11 inside the turn by turning the side clutch 300 inside the turn while the steering wheel 34 is turned left or right.

  The on / off operation of the side clutch 300 is continued only while the clutch operating pedal 303 is being depressed. When the operation of the clutch operating pedal 303 is stopped, the lower end side of the switching operation arm 307 is moved to the front side of the body by the urging force of the spring 317. Pulled back, the contact roller 308 pushes down the clutch shifter arm 305 to disengage the side clutch 300.

  With the above configuration, even when the side clutch 300 on the inside of the turn is turned off during turning, the switching operation arm 307 is retracted from the clutch shifter arm 305 when the clutch operating pedal 303 is operated with a force that can resist the urging force of the spring 317. Therefore, the rear wheel 11 can be driven and rotated even during a turning operation, the time required for turning travel is reduced, and the work efficiency is improved.

  Further, only when the clutch operating pedal 303 is being operated, the switching operation arm 307 is retracted, the disengaging operation mechanism of the side clutch 300 is cut off, and the operation of the clutch operating pedal 303 is performed when the side clutch 300 is engaged. Since the side clutch 300 on the inner side of the turn can be turned off at the same time as turning off, the turn operation is performed while the side clutch 300 is forgotten to be turned off, and the turn locus is disturbed and it takes time to adjust the next planting start position. Therefore, the work efficiency is improved and the seedling planting accuracy is improved.

  Since the spring 317 is provided across the switching operation arm 307 and the linkage arm 306, the front and rear lengths of the side clutch operation mechanism 316 can be shortened, so that the installation space for the side clutch operation mechanism 316 can be reduced. The weight of the aircraft and the number of parts can be reduced.

  Further, since the spring 317 acts directly in conjunction with the operation of the side clutch operation mechanism 316, there is almost no time lag until the side clutch 300 on the inside of the turn is operated by operating the clutch operation pedal 303. Since the rear wheel 11 on the inside of the turn is driven and rotated immediately when needed, the turnability and work efficiency are improved.

  Note that the above configuration is a configuration using a linkage mechanism in which a plurality of members are combined, and it is necessary for an operator to determine the timing of “on” or “off” the side clutch 300 inside the turn. At the time of turning, since the operator concentrates on the turning traveling, the “clutch” operation of the side clutch 300 may be forgotten until the traveling completely stops due to the resistance of mud.

  In order to prevent this, as shown in FIGS. 8 and 9, the handle rod 34 a is provided with a handle potentiometer 318 that detects an operation direction and an operation angle of the handle 34, and an engine rotation sensor 319 that detects the rotation speed of the engine 20. And rear wheel rotation sensors 320 and 320 for detecting the number of rotations of the left and right rear wheels 11 and 11 are provided. The rear wheel rotation sensors 320, 320 are arranged on the rear end side of the left and right drive shafts 12a, 12a that transmit driving force from the transmission case 12 to the left and right rear wheel gear cases 18, 18, and are connected to the drive shafts 12a, 12a. The number of rotations is detected.

  Note that the rear wheel 11 inside the turn is slightly rotated by the driving reaction force accompanying the turning of the airframe, so that the rear wheel rotation sensor 320 inside the turn obtains a fine detection value. This detected value may be recorded in the controller 321 provided in the bonnet 32, or a lower limit value may be set in the controller 321 and a control configuration may be regarded as “0” if it is less than the lower limit value.

  Further, the interlock operation rod 314 is divided into front and rear split rods 314 a and 314 b, and the front and rear split rods 314 a and 314 b are connected by a solenoid 322. When the solenoid 322 is in the “OFF” state, the interlock operation rod 314 moves back and forth in conjunction with the left / right turning operation of the handle 34 or the operation of the clutch operation pedal 303, and when it is in the “ON” state, the rear split rod 314 b is moved backward. The arrangement is such that the lower end side of the linkage arm 306 is moved rearward, and the side clutch 300 on the inner side of the turn is “on” operated by the above-described interlocking configuration.

  When the steering wheel 34 is operated at the time of turning and an operation angle at which the handle potentiometer 318 can be judged as turning is detected, the engine rotation sensor 319 measures the number of rotations of the engine 20, and the left and right rear wheel rotation sensors 320 and 320 The rotational speeds of the drive shafts 12a and 12a are measured. When the rotation speed S1 outside the turn is larger than the rotation speed S2 inside the turn by a predetermined value or more, the solenoid 322 is maintained in the “OFF” state, and the turning travel is continued.

  On the other hand, when the rotation speed S1 outside the turn is less than a predetermined value less than the rotation speed S2 inside the turn, or when the rotation speed S1 outside the turn is substantially the same as the rotation speed S2 inside the turn, the mud resistance Since turning is difficult, the rotational speed of the engine 20 is increased automatically or by the operator's throttle operation. If the rotation speed S1 on the outside of the turn becomes greater than the rotation speed S2 on the inside of the turn by this throttle operation, it is regarded that the turning travel has been resumed by overcoming resistance due to mud, and the turning travel is continued.

  However, the rotational speed S1 on the outer side of the turn is less than the predetermined value than the rotational speed S2 on the inner side of the turn, even though the rotational speed of the engine 20 detected by the engine speed sensor 319 after the throttle operation is increased, or When the rotation speed S1 on the outer side of the turn is substantially the same as the rotation speed S2 on the inner side of the turn, the controller 321 determines that there is no force to overcome the mud resistance even if the engine speed is increased. Sends a signal to operate “ON”.

  As a result, the solenoid 322 moves the rear split rod 314b backward, and the rear split rod 314b rotates the lower end side of the linkage arm 306 backward. Then, the upper end portion side of the linkage arm 306 rotates forward, the upper end portion side of the switching operation arm 307 rotates forward, and the lower end portion rotates backward so that the contact roller 308 moves from the flat portion 305a of the clutch shifter arm 305. Separate upward.

  As a result, the clutch shifter arm 305 pivots upward and the side clutch 300 on the inside of the turn is “on” and the rear wheel 11 is driven to rotate, so that a force that can overcome mud resistance can be generated, Traveling is not interrupted, improving work efficiency and seedling planting accuracy.

  The solenoid 322 receives a signal from the controller 321 and performs an “off” operation when the rotation speed S1 on the outer side of the left and right rear wheel rotation sensors 320, 320 is larger than the rotation speed S2 on the inner side of the rotation by a predetermined value or more. Then, it is assumed that the side clutch 300 on the inner side of the turn is “disconnected”.

Further, a control configuration in which the solenoid 322 is “on” when the clutch operation pedal 303 is operated may be employed.
As shown in FIGS. 6 and 7, a power steering device 309 is provided below the handle post 34 a to reduce the load on the operator when the handle 34 is operated. The power steering device 309 may be a hydraulic system using a proportional hydraulic valve 161 or an electric system using an electric motor 309a.

  FIG. 10 shows that in the hydraulic system using the proportional hydraulic valve 161, when the handle potentiometer 318 continues to detect an angle within a range that can be regarded as straight traveling for a predetermined time or more, the proportional hydraulic valve 161 is power-steered. This is an example of the straight traveling assist in which the supply of hydraulic oil to the device 309 is turned off and the handle 34 is not moved by a light force.

  At this time, since the remaining hydraulic oil is not supplied to the power steering device 309, the operator operates the handle 34 or the supply of hydraulic oil to the power steering device 309 automatically resumes after a predetermined time has elapsed. Until then, if the controller 321 is configured to increase the amount of oil fed from the proportional hydraulic valve 161 to the lifting hydraulic cylinder 46, the seedling planting unit 4 can be moved up and down at a higher speed. When automatically raising and lowering together, the seedling planting unit 4 can immediately shift to an appropriate working height, the seedling planting depth is appropriate, and the seedling planting accuracy and growth are good. Even when a plurality of seedlings are loaded and the weight of the seedling planting part 4 increases, sufficient hydraulic oil is supplied to the elevating hydraulic cylinder 46, so that the seedling planting part 4 rises reliably, especially at the time of ascent. Since it can, the planting depth of the seedling will be more stable.

  When the left and right rear wheel rotation sensors 320, 320 are rotated in the reverse direction, that is, reversely rotated, or the opening degree of the trunnion shaft 23a of the HST 23 is changed, When the lever potentiometer 16a provided at the base of the traveling operation lever 16 for operating the speed detects the reverse operation, the lever does not operate even if the condition is satisfied. Since there are many opportunities to operate the steering wheel 34 during reverse travel, stopping the power steering mechanism 309 makes it difficult to operate, leading to a decrease in operability and work efficiency. However, as described above, straight forward assist control is detected. By not accepting, operability and work efficiency are prevented from being lowered.

  In the above configuration, the power steering device 309 is used to perform the straight-ahead assist control. As shown in FIGS. 11 (a), 11 (b), and 12, the handle rod 34a is located below the handle 34 and below the handle rod 34a. A restriction pin 327 is provided on the upper side of the handle rod, and a restriction boss 328 is slidably mounted on the outer periphery of the handle rod 34a. The restriction boss 328 has a cylindrical shape, and a shortest portion 328a having a short vertical height is formed at the left and right central portions in a front view, and the vertical length is increased toward the left and right sides from the shortest portion 328a. The circumferential inclined surfaces 328b and 328b are formed.

  That is, half of the circumference of the restriction boss 328 has the same vertical length, and the other half has a configuration in which the vertical height increases from the left and right central portions toward the left and right sides when viewed from the front. The restriction pin 327 is positioned when the handle 34 is set to the neutral position above the shortest vertical portion.

  Also, a rack motor 329a is provided in the vertical direction at the rear side of the restriction boss 328, that is, at the back side of the shortest part 328a, and a sliding motor that rotates and drives a pinion gear 329b that meshes with the rack gear 329a and slides the restriction boss 328 up and down. 330 is arranged behind the handle rod 34a.

  Then, when the controller 321 detects the traveling speed of the traveling vehicle body 2 from the number of rotations of the left and right rear wheel rotation sensors 320, 320 and calculates that the traveling speed is equal to or higher than a predetermined speed, the controller 321 slides. The motor 330 is operated and the restriction boss 328 is slid upward to bring the shortest portion 328 a closer to the restriction pin 327. At this time, the regulation pin 327 is not in contact with the shortest portion 328a.

  Left and right guide rails 330b and 330b for sliding the restriction boss 328 in the vertical direction within a predetermined range are provided on the left and right sides of the restriction boss 328. The right and left guide rails 330b and 330b are provided on the left and right sides of the restriction boss 328, respectively. Left and right guide pins 330a and 330a are provided in contact with the rails 330b and 330b.

  As described above, when the operator operates the handle 34 or when the left and right front wheels 10 and 10 try to change the angle by the contact resistance with the ground, the left and right circumferential inclined surfaces formed on the restriction boss 328 by the contact pin 327 Since the load is applied in contact with 328b and 328b, the handle 34 does not rotate with some force, so that the straight traveling is maintained.

  As a result, it is possible to perform straight-ahead assist control without controlling the proportional hydraulic valve 161, the power steering device 309, and the like. In addition, the operation of the handle rod 34a, the proportional hydraulic valve 161, the lifting hydraulic cylinder 46, etc. is not restricted, but a load is generated in each member by increasing the load necessary for the rotation of the handle rod 34a and assisting straight travel. Difficult to improve durability.

  When the traveling speed calculated from the left and right rear wheel rotation sensors 320 and 320 becomes less than a predetermined speed, the controller 321 operates the sliding motor 330 to slide the restriction boss 328 downward, and the shortest portion 328a and the left and right Circumferentially inclined surfaces 328 b and 328 b are separated from the regulation pin 327.

  With the above-described configuration, there is no member that applies a load when the handle rod 34a rotates left and right during low-speed traveling. Therefore, when the operator operates the handle 34, the left and right front wheels 10 and 10 rotate according to the operation amount. Can be turned and the operability is improved.

  Further, since the control boss 328 is slid up and down along the left and right guide rails 330b and 330b on the basis of the traveling speed, the handle operation corresponding to the traveling speed can be performed, so that work adaptability is improved, Efficiency is improved.

  As shown in FIG. 2 and FIG. 13, a weight detection sensor 323 is provided in the seedling planting section 4, and when the weight detection sensor 323 detects an increase in the weight of the seedling planting section 4, the proportional hydraulic valve 161 raises and lowers the hydraulic pressure. The oil supply speed of the hydraulic oil to the cylinder 46 is reduced.

  When the seedling planting operation is performed, the seedling planting unit 4 is loaded with seedlings corresponding to the number of strips and increases in weight. In addition, when optional parts such as a chemical spreader for spraying chemicals such as herbicides are mounted, the weight increases accordingly. At this time, if the seedling planting part 4 is raised at a normal speed, a load due to a load is applied to the upper link arm 40 and the pair of left and right lower link arms 41, 41, the lifting hydraulic cylinder 46, etc. constituting the lifting link device 3. There arises a problem that the durability is lowered due to the rapid consumption.

  Moreover, when the seedling planting part 4 is lowered with the weight increased, the descending speed is faster than usual, so that the seedling planting starts faster than usual, and seedling planting starts. The position and planting end position are not aligned, and when planting the outer periphery of the field, that is, the headland, the seedling is crushed with the front wheel 10 and the rear wheel 11, or the seedling is planted again in the already planted place. There is.

  In order to prevent this, when the weight detection sensor 323 detects an increase in the weight of the seedling planting part 4 as described above, the oil supply speed from the proportional hydraulic valve 161 to the lifting hydraulic cylinder 46 is decreased, thereby Since the raising / lowering speed of the planting part 4 can be made low, since the load concerning the raising / lowering link apparatus 3 and the raising / lowering hydraulic cylinder 46 at the time of a raise is reduced and consumption of a member is suppressed, durability improves.

  Moreover, since the descending speed of the seedling planting part 4 is reduced, the planting start position of the seedling can be prevented from being accelerated and planted on the headland, so that the seedling can be crushed or overlapped at the time of headland work. Planting is prevented, the seedling planting accuracy is improved, and wasteful seedling consumption is suppressed.

  When the weight of the seedling planting part 4 detected by the weight detection sensor 323 is reduced to less than a predetermined weight, such as consuming seedlings, the proportional hydraulic valve 161 is controlled again, and the oil feeding speed to the lifting hydraulic cylinder 46 is increased. If a control configuration for increasing the speed is added, the seedling planting unit 4 can be moved up and down at a speed corresponding to the change in the amount of loaded seedlings, so that the work efficiency is improved and the seedlings are prevented from being crushed.

  14 and 15 show that the rolling shaft 44 constituting the seedling planting part 4 is provided with a rolling sensor 44a for detecting the amount of rotation of the seedling planting part 4 in the left-right direction. When 44a detects the rotation in the left-right direction more than a predetermined number of times within a predetermined time, the opening speed of the trunnion shaft 23a is reduced by operating the trunnion shaft 23a of the HST 23 with the HST servo motor 326. This is a control configuration to be lowered.

  The seedling planting unit 4 rotates in the left-right direction with the rolling shaft 44 as a pivot, so that the seedling planting unit 4 follows the field scene even when the traveling vehicle body 2 is tilted in the left-right direction due to unevenness of the field. Therefore, there is an effect that the seedling planting depth does not change in the left-right direction of the seedling planting part 4 and the growth of the seedling is stabilized. However, there is a problem that the planting depth of the planting devices 52 becomes unstable when the field continues to rotate in the horizontal direction in response to irregularities that do not affect the planting depth. In particular, when traveling at high speed, it is easily affected by unevenness, and the planting depth of the seedling tends to become unstable.

  In order to solve this problem, in the present configuration, when the seedling planting part 4 rotates in the left-right direction more than a predetermined number of times within a predetermined time, the opening of the trunnion shaft 23a is reduced to reduce the traveling speed. Since excessive rolling operation can be prevented, the planting depth of the seedling is stabilized and the growth of the seedling is improved. When the traveling speed is reduced, the small soil can be stepped on by its own weight, and even if the front wheel 10 and the rear wheel 11 enter the small depression, the traveling vehicle body 2 tilts only slightly, so that the posture of the seedling transplanter 4 is maintained. Be drunk.

  Further, as shown in FIGS. 1 and 16, an elevating sensor 325 for detecting the elevating and elevating position of the seedling planting unit 4 is provided at the base of the upper link arm 40 constituting the elevating link mechanism 3, and the elevating sensor is 325. When it is detected that the upper link arm 40 has moved up and down a predetermined number of times or more within a predetermined time, it is regarded as a hunting state. The hunting state occurs when the farm has many irregularities and the machine swings back and forth. At this time, the lifting hydraulic cylinder 46 is finely expanded and contracted. If the hunting state is left unattended, the seedling planting part 4 rises immediately before the planting device 52 ... plants the seedling in the field, the seedling planting depth becomes too shallow, or the seedling is not planted and falls to the field scene. Therefore, there is a problem that an unplanted section occurs.

  When the controller 321 recognizes the hunting state from the detection result of the lift sensor 325 in order to eliminate the hunting state, the controller 321 controls the proportional hydraulic valve 161 to intermittently feed hydraulic oil to the lifting hydraulic cylinder 46. The oil supply timing is such that oil is supplied when the elevating hydraulic cylinder 46 contracts due to hunting, and no oil is supplied when it is extended.

  That is, by performing oil feeding in the opposite phase to hunting, the vertical movement of the seedling planting part 4 due to the unevenness of the field is canceled, so that the height of the seedling planting part 4 and the field scene is prevented from changing, The planting depth of the seedling is stabilized, and the effect of improving the growth of the seedling is obtained.

  As shown in FIGS. 5 and 17, an HST servo for providing a trunnion potentiometer 23 b for detecting the opening of the trunnion shaft 23 a of the HST 23 and rotating a trunnion arm (not shown) for changing the opening of the trunnion shaft 23 a is provided. A motor 326 is provided. The HST servo motor 326 operates according to the detection result of the lever potentiometer 16a that detects the operation amount of the travel operation lever 16, and rotates the trunnion arm to open and close the trunnion shaft 23a. When the lever potentiometer 16a detects the operation of the travel operation lever 16, the opening of the trunnion shaft 23a is detected simultaneously by the trunnion potentiometer 23b. When the opening of the trunnion shaft 23a is less than a predetermined angle, the controller 321 rotates the HST servo motor 326 at a low speed. On the other hand, when the opening of the trunnion shaft 23a is equal to or larger than a predetermined angle, the controller 321 is configured to rotate the HST servo motor 326 at a high speed.

  With the above configuration, the opening of the trunnion shaft 23a can be slowly changed at the start of traveling when the opening of the trunnion shaft 23a is small. Therefore, the operator is not surprised at the sudden acceleration and the operation is not mistaken, and the operability is improved.

  Further, since the planting device 52 can plant the seedlings in a stable posture at the starting position, it is possible to prevent the seedling planting posture from being disturbed and the non-planting section from being generated, and the planting accuracy of the seedlings is prevented. Will improve.

  On the other hand, when the travel is started and the opening of the trunnion shaft 23a becomes a predetermined angle or more, the opening of the trunnion shaft 23a can be quickly changed. Since it accelerates slowly when operated, it is possible to change the traveling speed that matches the operating speed of the traveling operation lever 16, so that the operability is improved.

  As shown in FIGS. 5 and 18, the center float 55 is configured to be rotated by the unevenness of the field, and an elevation angle sensor 331 is provided. The angle change of the elevation angle sensor 331 is sent to the controller 321, and the proportional hydraulic valve 161 is controlled based on the detection result, and the raising / lowering hydraulic cylinder 46 is finely expanded / contracted to finely raise / lower the seedling planting unit 4, thereby making the unevenness of the field In addition, the planting depth is maintained at an appropriate height.

  In addition, when the angle at the time of grounding is “0” and the front end side of the center float 55 is rotated upward and an angle greater than a predetermined positive value is detected, the center float 55 moves from the flat part to the convex part, or the concave part Since the distance between the planting device 52... And the field scene approaches, the lifting hydraulic cylinder 46 contracts and the seedling planting unit 4 rises, and the front end of the center float 55 When the part side pivots downward and an angle greater than or equal to a predetermined negative value is detected, it is time to move from the flat part to the concave part, or from the convex part to the flat part, and the planting device 52. Since the distance from the surface is separated, the lifting hydraulic cylinder 46 is extended and the seedling planting portion 4 is lowered. The elevation angle can be changed by operating the elevation hydraulic dial 332 provided on the operation panel 33. When the elevation hydraulic dial 332 is operated to the “sensitive” side, the reference angle for elevation is reduced. The seedling planting part 4 is moved up and down in response to fine irregularities. On the other hand, when operated to the “insensitivity” side, the reference angle for raising and lowering is increased, and the seedling planting portion 4 is moved up and down only when there is large unevenness.

  In addition to this, an angular velocity sensor 333 is provided for detecting an angular velocity until the float potentiometer 331 reaches an angle for raising and lowering the seedling planting portion 4, and the angular velocity detected by the angular velocity sensor 333 is fast, that is, the seedling is measured from the ground contact angle. When the time required to reach the predetermined angle for raising and lowering the planting unit 4 is short, the controller 321 determines that there is a sudden change in the field depth, operates the proportional hydraulic valve 161, and moves the elevating hydraulic cylinder 46 at high speed. Stretch with.

  On the other hand, when the angular velocity detected by the angular velocity sensor 333 is slow, that is, when it takes a long time to reach the predetermined angle for raising and lowering the seedling planting unit 4 from the ground contact angle, the controller 321 has a gradual change in the field depth. The proportional hydraulic valve 161 is operated and the elevating hydraulic cylinder 46 is expanded and contracted at a low speed.

  With the above control configuration, when there is a sudden change in the field depth, the planting depth of the planting device 52 can be increased or decreased at a high speed, and when there is a gradual change in the field depth, Since the planting depth of the planting device 52 can be increased or decreased slowly, the planting depth of the seedling is prevented from becoming too shallow or too deep, and the growth of the seedling is stabilized.

In addition, since it is possible to prevent an unplanted section where the seedling does not reach the farm scene and the seedling cannot be planted, it is not necessary for the operator to manually plant the seedling, and the work efficiency is improved.
The reference of the control is not the detection speed of the angular velocity sensor 333 but the amount of displacement until it fully rotates upward or downward from the ground contact position. If the amount of displacement is large, the elevating hydraulic cylinder 46 is expanded and contracted at high speed, and the amount of displacement is If it is smaller, the elevating hydraulic cylinder 46 may be expanded and contracted at a low speed.

  By changing the expansion / contraction speed of the elevating hydraulic cylinder 46 in accordance with the amount of displacement detected by the angular velocity sensor 333, the planting depth of the planting device 52 is adjusted to an appropriate depth, so that the seedling planting accuracy is improved. And seedling growth is stabilized.

  As shown in FIGS. 19 and 20, one or a plurality of load sensors 334 are provided on the rotation shaft 70a of the center rotor 27a or the left and right rotation shafts 70b, 70b of the left and right side rotors 27b, 27b, and the load sensor 334 has a predetermined value. When the above load is detected, the controller 321 determines that the center rotor 27a, the left and right side rotors 27b and 27b, or the entire rotor has been lowered too much, and the display display 335 provided on the operation panel 33 displays “rotor position too low”. The display is configured.

  With the above configuration, even if the work height of the center rotor 27a and the left and right side rotors 27b and 27b set by the operator is too low, and the ground is strongly grounded or submerged in the field, the display 335 is displayed. Therefore, it is easy for the operator to notice that the center rotor 27a and the left and right side rotors 27b, 27b are too lowered, and the center rotor 27a and the left and right side rotors 27b, 27b are damaged due to overload. In addition to being prevented, it is possible to prevent the formation of large depressions in the farm scene and the formation of large protrusions by raising the soil in a state close to the field or submerged in the field. The seedling planting depth is prevented from being disturbed.

  Even if the vertical position of the center rotor 27a and the left and right side rotors 27b, 27b are set to appropriate positions, if the load sensor 334 detects a load of a predetermined value or more, the center rotor 27a and the left and right side rotors When the rotor 27b, 27b interferes with foreign objects such as stones and sawdust, an overload is output on the display 335, so that the operator immediately notices the abnormality. Therefore, the center rotor 27a and the left and right side rotors 27b, 27b can be prevented from being damaged due to overload.

  As shown in FIG. 5, a headland lift button 336 is provided on the operation panel 33, and a leveling lift motor that lifts and lowers the center rotor 27 a and the left and right side rotors 27 b and 27 b when the headland batch button 336 is “on”. 337 operates to lower the center rotor 27a and the left and right side rotors 27b and 27b. In addition, the current setting of the lifting hydraulic dial 332 is changed to near “insensitivity”, the amount of oil fed to the proportional hydraulic valve 161 is increased, and the lifting and lowering hydraulic cylinder 46 is expanded and contracted quickly to raise and lower the seedling planting portion 4. In addition to increasing the speed, the amount of oil supplied to the power steering device 309 is reduced to increase the force required to rotate the handle 34. Further, when the partial strip clutch 54a for turning on / off the driving force to a predetermined seedling planting transmission case 54 is operated to “off”, the corresponding partial strip clutch 54a is operated to “on” and the seedling is seeded. The left and right line drawing markers 338, 338 are provided on both the left and right sides of the planting part 4 and are alternately grounded in conjunction with the turning of the armored vehicle body 2 so as to draw a line that serves as a guide for straight running in the field. It is set as the structure which pulls up by 339 and switches to the "OFF" state in which both right and left are not earth | grounded.

  With the above configuration, when the headland collective button 336 is operated, the working sections are simultaneously changed to the work conditions necessary for the headland work for planting seedlings at the four corners of the field, so the efficiency of the headland work is improved. At the same time, the planting accuracy of the seedling is improved.

  The headlands, which are the four corners of the field, are hard to approach the field edge because the rotary that is attached to a work vehicle such as a tractor and cultivates the field is often harder and rougher than other parts. By lowering the rotor 27a and the left and right side rotors 27b, 27b, it becomes easy to level the unevenness and make the seedling planting depth appropriate.

  Further, the reference angle at which the seedling planting part 4 is moved up and down is changed closer to “insensitivity” than the setting of the lifting hydraulic dial 332, and the oil feeding speed from the proportional hydraulic valve 161 is increased to increase the lifting hydraulic cylinder 46. By increasing the expansion / contraction speed, it is possible to adjust the planting depth by raising and lowering the seedling planting unit 4 only when the vertical rotation angle of the center float 55 is large, and the seedling planting unit 4 frequently moves up and down. In addition, the planting depth of the seedlings is stabilized, and when the seedling planting unit 4 is lifted, the planting device 52... Does not plant seedlings during the raising and lowering of the seedling planting unit 4. , Planting accuracy of seedlings is further improved.

  Further, the partial strip clutch 54a... That has been operated "off" is automatically "on", and the marker operating motor 339 makes both the left and right line drawing markers 338, 338 non-use, so that the pillow Since the partial strip clutch 54a... Can be cut off just before the ground work and the transition to the headland work can be prevented, the occurrence of the unplanted section of the seedling is prevented, and the labor for the operator to replant is reduced. Since the left and right drawing markers 338 and 338 can be prevented from projecting to the side of the machine during the headland work approaching the field edge, the left and right drawing markers 338 and 338 are prevented from being damaged.

2 Traveling body 11 Rear wheel (traveling device)
34 Handle (steering member)
34a Handle rod (steering rod)
300 Side clutch (switching transmission)
300a Switching operation axis (switching axis)
303 Clutch operating pedal (release switching member)
304 Clutch operating wire (traction member)
305 Clutch shifter arm (operation member)
305a Flat part (contact part)
306 Linking arm (swivel interlocking member)
307 Switching operation arm (release operation member)
308 Contact roller (contact body)
317 Spring (biasing member)
314b Rear split rod (split rotating operation shaft)
320 Rear wheel rotation sensor (rotation detection member)
322 Solenoid (solenoid valve)
327 Restriction pin (contact protrusion)
328 Restriction boss (rotation restriction member)
328b Circumferentially inclined surface (regulation notch)
330 Sliding motor (sliding device)
A swivel interlocking mechanism

Claims (5)

The running wheels on the running body (2) (11) is provided, the switching gear to turn on and off the driving force to the driving wheel (11) to (300) is provided, the switching of Nyusetsu operating the switching gear (300) axis provided (300a), the operating member (305) provided to operate the sections Kawajiku (300a), due the vehicle body (2) to the operation of the steering operation to the steering member (34), said operation in working vehicle provided with a pivoting linkage mechanism (a) for switching operating the switching gear (300) by operating the member (305),
A turning interlocking member (306) that rotates in conjunction with the operation of the steering member (34) is provided;
A release operation member (307) is rotatably provided on an upper portion of the turning interlocking member (306), and the release operating member (307) interlocking with the turning interlocking member (306) comes into contact with the operation member (305) and The operation member (305) is operated to be in the turning interlocking state, and the urging member (317) for urging the release operation member (307) in the direction in contact with the operation member (305) is connected to the turning interlocking member (306). Provided over the release operating member (307),
A release switching member (303) is provided for operating the release operation member (307) in a swing interlocking state and a swing interlocking release state, and the release switching member (303) and the release operation member (307) are connected by a pulling member (304). When the release switching member (303) is operated against the urging force of the urging member (317), the release operation member (307) releases the turning interlocking state and turns on the switching transmission device (300). A work vehicle characterized by having a configuration . A contact body (308) is provided below the release operation member (307), and a contact portion (305a) with which the contact body (308) contacts is formed on the operation member (305). The work vehicle according to 1. A rotating arm (311) that rotates in the front-rear direction in conjunction with the operation of the steering member (34) is provided, and the lower part of the rotating arm (311) and the rotation interlocking member (306) is connected to an interlock operation rod (314). )
When the operation angle of the steering member (34) exceeds a predetermined angle, the interlocking operation rod (314) moves forward to rotate the lower part of the turning interlocking member (306) forward and the upper part backward. , The contact body (308) is brought into contact with the contact portion (305a) and the switching transmission device (300) is turned off,
When the operation angle of the steering member (34) becomes less than a predetermined angle, the interlocking operation rod (314) moves rearward to rotate the lower part of the turning interlocking member (306) backward and the upper part forward. The work vehicle according to claim 2 , wherein the contact body (308) is retracted from the contact portion (305a) and the switching transmission device (300) is turned on. An electromagnetic actuator (322) for rotating the turning interlocking member (306) in the front-rear direction in conjunction with the turning operation of the steering member (34);
When the operation angle of the steering member (34) becomes a predetermined angle or more, the electromagnetic actuator (322) rotates the lower part of the turning interlocking member (306) forward and the upper part backward, thereby causing the contact body ( 308) is brought into contact with the contact portion (305a) to turn off the switching transmission device (300),
When the operation angle of the steering member (34) is less than a predetermined angle, the lower part of the turning interlocking member (306) is rotated rearward and the upper part is rotated forward, thereby bringing the contact body (308) into contact part (305a). The work vehicle according to claim 2 , wherein the work vehicle is configured to enter and operate the switching transmission device (300) . A rotation detection member (320) for detecting the rotation speed of the traveling wheel (11) is provided. When the rotation speed of the traveling wheel (11) detected by the rotation detection member (320) becomes less than a predetermined value, the electromagnetic actuator ( 322) to actuate the by working vehicle according to claim 4 Symbol mounting characterized by being configured to enter operating the switch gearing (300).