JP2017023106A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle capable of improving maintainability of a mechanism for controlling lifting operation and work action of a ground work device.SOLUTION: A work vehicle comprises: a lifting linkage mechanism that is provided on the rear part of a traveling vehicle body and lifts and lowers a ground work device; a lifting cylinder that makes the lifting linkage mechanism perform lifting action; an operation instrument comprising a lifting operation member for activating the lifting cylinder and a work ON/OFF member for switching the ground work device between a work state and a non-work state; a switching valve that switches the lifting cylinder's action by using movement of a spool; a drive unit that starts according to operation using the lifting operation member or the work ON/OFF member; a switching arm that is rotated by the drive unit to move the spool; a rotation sensor that detects the amount of rotation of the switching arm; and a control unit that controls the ground work device's lifting action and work action, on the basis of the operation using the lifting operation member or the work ON/OFF member and a detection value of the rotation sensor at the time of the operation using the lifting operation member or the work ON/OFF member.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a work vehicle that travels while performing work on a farm field.

  Conventionally, as a work vehicle that travels while performing a predetermined work on a farm field or the like, a travel control lever is provided with a lift switch that lifts and lowers a ground work device connected to a travel vehicle body, and a ground work device that is in a working state and a non-working state. Some switches are provided with a changeover switch (see, for example, Patent Document 1).

  In such work vehicles, the lift switch is operated while operating the traveling operation lever, and the advancement and retreat of the lift cylinder is switched via the electromagnetic valve to raise and lower the seedling planting device, which is a ground work device, or by operating the switch. It is possible to operate the planting clutch.

  With this configuration, the operator can perform the traveling operation and the raising / lowering operation of the seedling planting device and the seedling planting operation with one hand, and the traveling operation and the operation of the seedling planting unit are simplified and the operability is improved. .

JP-A-2015-84673

  However, as disclosed in Patent Document 1, in the configuration using the electromagnetic valve, the configuration of the hydraulic circuit becomes complicated, and a high-performance control device is required to finely control the lifting and lowering of the lifting cylinder. Therefore, if a failure occurs, a great deal of time and labor is required for repair, and maintenance work may not be performed without appropriate knowledge and technology for electronic components. Moreover, since many expensive components are used, the cost may increase.

  This invention is made in view of the above, Comprising: It aims at providing the work vehicle which can improve the maintainability of the mechanism which controls the raising / lowering operation and work operation | movement of a ground work apparatus.

  In order to solve the above-described problems and achieve the object, the invention of claim 1 is provided at the rear part of the traveling vehicle body (2), and the lifting link mechanism (3) for raising and lowering the ground work device (4); An elevating cylinder (25) that moves the elevating link mechanism (3) up and down, an elevating operation member (361) that operates the elevating cylinder (25), and the ground work device (4) in a working state and a non-working state. An operation tool (36) having a work on / off member (362) for switching, a switching valve (130) for switching the operation of the lifting cylinder (25) by movement of a spool (131), and the lifting operation member (361) Or the drive part (110) which operate | moves according to operation of the said work on / off member (362), and the switching arm (120) which rotates by the said drive part (110) and moves the said spool (131) A rotation sensor (140) for detecting a rotation amount of the switching arm (120), an operation of the elevating operation member (361) or the work on / off member (362), an elevating operation member (361) or the A control unit (100) for controlling a lifting operation and a work operation of the ground work device (4) based on a detection value of the rotation sensor (140) when the work turning member (362) is operated. The working vehicle is characterized by this.

  In the invention according to claim 2, the switching valve (130) can switch the lifting / lowering operation of the lifting / lowering link mechanism (3) to a rising / lowering and a lifting / lowering stop mode, and the control unit ( 100) The work vehicle according to claim 1, wherein the drive unit (110) is stopped when a value detected by the rotation sensor (140) reaches a predetermined value.

  According to a third aspect of the present invention, the control unit (100) is configured such that the detected value of the rotation sensor (140) indicates that the ground work device when the elevating operation member (361) is lifted. When (4) is a value that can be regarded as working, the ground working device (4) is set to a non-working state, and the switching unit (120) is rotated by operating the drive unit (110), The work vehicle according to claim 2, wherein the switching valve (130) is switched so that the elevating link mechanism (3) is in a rising mode.

  According to a fourth aspect of the present invention, in the control unit (100), when the work on / off member (362) is operated, the detected value of the rotation sensor (140) indicates that the lift link mechanism is When (3) is a value that can be regarded as an ascending mode or an elevator stop mode, the switching valve (130) is operated so that the drive unit (110) is operated and the elevator link mechanism (3) is in the descending mode. And when the work on / off member (362) is operated, the detected value of the rotation sensor (140) is a value that the lift link mechanism (3) can be regarded as the lowering mode. Operating the part (110) to rotate the switching arm (120), further lowering the ground work device (4) to a work position, bringing the ground work device (4) into a working state, Work on / off member (362) When the detected value of the rotation sensor (140) is a value that the ground working device (4) can be considered to be working when operated, the drive unit (110) is operated to switch the switching arm ( 120) is rotated to switch the switching valve (130) so that the elevating link mechanism (3) is in the descending mode, and the ground work device (4) is set to a non-working state. It was set as the work vehicle of claim | item 2 or 3.

  According to a fifth aspect of the present invention, the operation tool (36) is provided with a continuous lowering operation member (363) for continuously lowering the ground work device (4), and the control unit (100) includes: When the detected value of the rotation sensor (140) is a value that the lift link mechanism (3) can be regarded as the lift mode or the lift stop mode, the operation of the continuous lowering operation member (363) is continued. When the drive unit (110) is operated, the switching valve (130) is switched through the switching arm (120) so that the elevating link mechanism (3) is in the lowering mode, When the operation of the continuous lowering operation member (363) is interrupted, the drive unit (110) is operated so that the elevating link mechanism (3) enters the elevating stop mode via the switching arm (120). Switch to And a working vehicle according to any one of claims 2 4, characterized in that switching the lube (130).

  According to a sixth aspect of the present invention, the switching arm (120) includes a rotating arm (122) rotated by the driving unit and the switching valve (122) in conjunction with the rotating arm (122). 130), the switching arm (120), the drive unit (110), the rotation sensor (140), and the switching valve (130) are connected to the traveling vehicle body (2). The switching unit (200) is arranged on a common mounting plate (210) that is detachably attached to the frame (15), and the switching valve (130) and the interlocking arm (121) are The drive unit (110), the rotation arm (122), and the rotation sensor (140) are arranged on the inner side of the mounting plate (210) while being disposed on the outer side of the mounting plate (210). And a working vehicle according to any one of claims 1 to 5, characterized in that disposed.

  Further, in the invention according to claim 7, the mounting plate (210) has a hole (215) through which a mounting member for mounting the driving unit (110) and the rotation sensor (140) is inserted. The switching unit (200) including the mounting plate (210) is disposed on the outer side of the control seat (41) provided at the left and right center of the traveling vehicle body (2), and the mounting member is moved to the traveling vehicle. The work vehicle according to claim 6, wherein the work vehicle can be inserted into the hole (215) from the outside of the vehicle body (2).

  The invention according to claim 8 is a float (62) that can be grounded to a farm scene and is rotatably attached to a lower part of the ground work device (4), and the rotation of the float (62). The automatic lift arm (250) capable of switching the switching valve (130) by moving the spool (131) in response to the connecting wire (250) connecting the float (62) and the automatic lift arm (250) 270), a spring (260) for urging the automatic lifting arm (250) in a direction away from the switching valve (130), and an inner side of the mounting plate (210). 250) to adjust the amount of rotation of the float (62) that changes the pulling amount by the connecting wire (270) to turn the switching valve (130). And a valve block lever (135) disposed outside the mounting plate (210) and switching the switching valve (130) to a locked state. Item 6 or 7 is a work vehicle.

  The invention according to claim 9 includes a link rotation sensor (31) for detecting a rotation position of the elevating link mechanism (3), and the control unit (100) includes the link rotation sensor (31). ) Detects an angle that is smaller by a predetermined angle than the angle at which the elevating link mechanism (3) can be regarded as being in the raised state, the elevating operation of the elevating link mechanism (3) is performed by the drive unit (110). 9. The switch according to claim 2, wherein the switching arm is rotated at an angle at which the lift stop mode is set, and the lift link mechanism is stopped. Work vehicle.

  In the work vehicle according to claim 1, the drive unit (110) is operated by operating the elevating operation member (361) or the work on / off member (362) provided in the operation tool (36), and the switching arm ( 120), the switching valve (130) is switched, and the working height and the on / off operation of the ground work device (4) are mechanically switched. Accordingly, it is possible to improve the maintainability of the mechanism that controls the ground work device (4) while having an inexpensive configuration. Further, for example, it is not necessary to operate a plurality of operation levers and the operability is improved.

  In addition to the effect of the invention of claim 1, the work vehicle according to claim 2 stops the drive unit (110) when the value detected by the rotation sensor (140) reaches a predetermined value. Therefore, a more reliable operation can be performed with a mechanical configuration.

  In addition to the effect of the invention of claim 2, the work vehicle according to claim 3 is configured so that when the ground work device (4) is working when the lifting operation member (361) is lifted, the ground work device ( Since 4) switches to a non-working state, it can prevent that a ground work apparatus (4) act | operates in the position away from the agricultural field scene. Therefore, wasteful consumption of work materials such as seedlings, fertilizers, and medicines during work is prevented.

  According to a fourth aspect of the present invention, in addition to the effect of the second or third aspect of the invention, when the work on / off member (362) is operated, the detected value of the rotation sensor (140) indicates that the lift link If the mechanism (3) is not in the lowering mode, the lifting link mechanism (3) is lowered. The ground work device (4) is switched to work entry when the work entry / cutting member (362) is further operated in the lowered state. Accordingly, since the ground work device (4) can be prevented from being in a working state while the lifting link mechanism (3) is being lowered, the ground work device (4) can be prevented from operating at a position away from the farm scene. For example, wasteful working materials such as seedlings, fertilizers, and drugs are prevented from being consumed during work. Further, when the detected value of the rotation sensor (140) indicates that the elevating link mechanism (3) can be regarded as the lowering mode, the ground work device (4) is further lowered to the work position, and the ground work device (4) is moved. When the working state is set, and the detected value of the rotation sensor (140) can be regarded as the ground working device (4) is working, the elevating link mechanism (3) is in the descending mode and the ground working device (4 ) Becomes non-working. Therefore, since the lowering operation to the work height and the operation on / off operation for the ground work device (4) can be performed with one work on / off member (362), the operability can be further improved and the number of parts can be reduced. Can be achieved.

  In addition to the effect of the invention according to any one of claims 2 to 4, the work vehicle according to claim 5 is provided with a lifting link mechanism (3) when the operation of the continuous lowering operation member (363) is continued. ) Continues to descend, and when interrupted, the descending of the elevating link mechanism (3) stops. Therefore, the descent position of the ground work device (4) can be finely adjusted, and work accuracy and work efficiency are improved.

  In addition to the effect of the invention according to any one of claims 1 to 5, the work vehicle according to claim 6 includes a drive unit (110), a rotation arm (122), and a rotation sensor (140). Is disposed on the inner side of the mounting plate (210), so that damage due to adhesion of water or mud can be prevented in advance. In addition, since the mounting plate (210) is detachably attached, the constituent members of the switching unit (200) can be removed from the traveling vehicle body (2) collectively, so that extra parts can be attached and detached during maintenance work. There is no need for work and the maintenance is improved.

  In addition to the effect of the invention of claim 6, the work vehicle according to claim 7 is configured such that the attachment member can be attached to the attachment plate (210) from the outside of the vehicle body. Only the rotation sensor (140) can be attached and detached from the outside of the vehicle body, and the work of removing extra parts is not required, thereby further improving the maintainability. In addition, since the switching unit (200) is disposed outside the control seat (41), the maintenance operation of the switching unit (200) can be performed from the outside of the vehicle body, so that the worker takes an unreasonable posture during the work. This is unnecessary, and the work efficiency can be improved and the labor of the worker can be reduced.

  In the work vehicle according to claim 8, in addition to the effects of the invention of claim 6 or 7, the float sensitivity adjusting lever (280) and the valve block lever (135) are also provided on the mounting plate (210) to concentrate the members. Since they are arranged, it is possible to reduce the number of mounting parts and the like, and it is possible to improve the efficiency and cost of mounting work. Further, since the float sensitivity adjustment lever (280) and the valve block lever (135) can be provided near the control seat (41), the operator can move up and down without moving from the control seat (41). Since the automatic elevating / lowering condition (3) can be changed and the switching valve (130) can be switched to the locked state, the work efficiency is improved.

  In the work vehicle according to claim 9, in addition to the effect of the invention according to any one of claims 2 to 8, the drive unit (110) operates the lift link mechanism (3) at a position lower than the raised position. In order to stop the elevating cylinder (25), the elevating link mechanism (3) can be rotated upward until the elevating cylinder (25) is stopped after the drive unit (110) is operated. It is possible to prevent an unnecessary load from being applied to the lift link mechanism (3) and the lift cylinder (25).

FIG. 1 is a side view of a seedling transplanter according to the present embodiment. FIG. 2 is a plan view of the seedling transplanter according to the present embodiment. FIG. 3 is an explanatory diagram showing a control mechanism of the seedling planting unit of the seedling transplanter according to the present embodiment. FIG. 4 is an explanatory diagram showing the switching unit. FIG. 5 is a schematic explanatory view showing the operation of the switching arm and the operation of the automatic lifting arm. FIG. 6 is a flowchart illustrating an example of operation control of the lifting link mechanism according to the operation of the lifting operation switch. FIG. 7 is a flowchart illustrating an example of operation control of the lifting link mechanism in accordance with the operation of the lifting operation switch. FIG. 8 is a flowchart showing an example of operation control of the lifting / lowering link mechanism according to the operation of the work on / off switch. FIG. 9 is a flowchart showing an example of operation control of the lifting / lowering link mechanism according to the operation of the continuous lowering operation switch. FIG. 10 is an explanatory view showing the arrangement of the retaining bolts of the differential lock arm in the mission case. FIG. 11 is an explanatory diagram of a planting clutch. FIG. 12 is an explanatory view showing a planting clutch pin. FIG. 13 is an explanatory diagram showing the arrangement of the batteries. FIG. 14A is an explanatory diagram illustrating an example of a hydraulic circuit of the seedling transplanter. FIG. 14B is an explanatory diagram illustrating a comparative example of the hydraulic circuit of the seedling transplanter. FIG. 15 is an explanatory diagram illustrating an example of a hydraulic circuit of a seedling transplanter according to another embodiment.

  Hereinafter, a work vehicle according to an embodiment of the present invention will be described in detail with reference to the drawings. In the embodiment, when the front-rear and left-right directions are defined, the traveling direction of the traveling vehicle body is used as a reference when viewed from the control seat. The present invention is not limited to the embodiments, and various modifications can be made without departing from the scope of the present invention. Furthermore, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art, or substantially the same, so-called equivalent ranges.

  In the present embodiment, the work vehicle will be described as a riding seedling transplanter equipped with a seedling planting unit 4 as a ground working device. FIG. 1 is a side view of a seedling transplanter, and FIG. 2 is a plan view of a traveling vehicle body. The seedling transplanter according to the embodiment has a configuration of eight-row planting, but may be a seedling transplanter having a different number of planting strips from the present configuration. In addition, when referring to the entire seedling transplanter, it may be referred to as an aircraft.

  As shown in FIGS. 1 and 2, the seedling transplanter according to the present embodiment is provided with a seedling planting portion 4 for planting seedlings in a farm field through a lifting link mechanism 3 on the rear side of the traveling vehicle body 2 so as to be able to move up and down. ing. And the main-body part of the fertilizer application apparatus 5 is arrange | positioned at the rear upper part of the traveling vehicle body 2. FIG. In addition, when the work vehicle is not a seedling transplanter, there are some equipped with a seeding device for supplying seeds as a work device.

  The traveling vehicle body 2 is a four-wheel drive vehicle including left and right front wheels 10 and 10 and rear wheels 11 and 11 as drive wheels. On the front side of the main frame 15 constituting the vehicle body skeleton of the traveling vehicle body 2, a transmission case 13 that transmits driving force to the seedling planting part 4 and the like, and hydraulic pressure that outputs the driving force supplied from the engine 30 to the transmission case 13 And a continuously variable transmission 14 of the type. The continuously variable transmission 14 is a hydrostatic continuously variable transmission called a so-called HST (Hydro Static Transmission).

  A front wheel final case 10 a is provided on the left and right sides of the mission case 13. The front wheels 10 are attached to the left and right front axles 10b projecting outward from the front wheel support portions that can change the steering direction of the left and right front wheel final cases 10a. A rear wheel gear case 11a is attached to the left and right sides of a rear frame 22 (see FIG. 2) provided in the lateral direction of the fuselage on the rear side of the main frame 15, and protrudes outward from the rear wheel gear case 11a. The rear wheels 11 are attached to the left and right rear axles 11b.

  In addition, left and right link support frames 23, 23 that support the elevating link mechanism 3 project upward from the upper portion of the rear frame 22. A pair of left and right lower link arms 24, 24 are provided on the lower side of the left and right link support frames 23, 23 and between the left and right sides, and hydraulically between the left and right of the left and right lower link arms 24, 24. An operating lift cylinder 25 is provided. Then, by providing the upper link arm 26 above the lifting cylinder 25, the lifting link mechanism 3 which is a parallel link mechanism is configured. The other end sides of the left and right lower link arms 24, 24, the lifting cylinder 25, and the upper link arm 26, each having one end connected to the traveling vehicle body 2 side, are attached to the front part of the seedling planting unit 4.

  As shown in the figure, an engine 30 is mounted on the main frame 15. The rotational power of the engine 30 is transmitted to the transmission case 13 via the belt transmission 21 and the continuously variable transmission (HST) 14. The rotational power transmitted to the mission case 13 is shifted by the transmission in the mission case 13 and then separated into traveling power and external power to be extracted.

  The externally extracted power that is separated from the rotational power transmitted to the transmission case 13 is transmitted to a planting clutch case 27 provided at the rear part of the traveling vehicle body 2. Then, it is transmitted from the planting clutch case 27 to the seedling planting unit 4 through the planting transmission shaft 67.

  On the other hand, left and right drive shafts 42 are provided at the rear of the mission case 13. The rotational power from the engine 30 is transmitted to the left and right rear wheel gear cases 11a and 11a via the mission case 13 and the drive shaft 42.

  Although not shown, a side clutch mechanism for turning on and off the transmission to the left and right drive shafts 42 and 42 is disposed on the upper side in the transmission direction than the left and right drive shafts 42 and 42. As shown in FIG. 1, side clutch pedals 43a and 43a for turning on and off the left and right side clutch mechanisms are provided at the front lower portion of the control seat 41 and on the left and right sides.

  Of the left and right side clutch pedals 43a, 43a, when the side clutch mechanism 43 is turned off by depressing the side clutch pedal 43a and the steering wheel 35 is operated to turn the vehicle, the drive wheel of the rear wheel 11 inside the turn is driven. Can be completely blocked. Therefore, the turning radius can be made smaller than the turning traveling by the operation of the handle 35 alone, the work starting position of the work strip suitable for the field can be appropriately selected, and the work accuracy is improved.

  In this way, transmission to the rear wheel 11 inside the turn during turning can be stopped, the turning radius can be reduced, and the work position before turning and the work position after turning can be prevented from being separated. There is no need to re-adjust the work start position, improving work efficiency and work accuracy. In this embodiment, when the traveling body 2 is turned by turning the handle 35, the side clutch mechanism located inside the turn is turned off, and the transmission to the rear wheel 11 inside the turn is stopped. Can be done.

  A bonnet 39 is provided at the upper front side of the traveling vehicle body 2 and includes a control panel 38 for operating each part. The control panel 38 is provided with a control switch 48 and a setting dial 49 for performing predetermined operation control via a control device (not shown).

  Further, the bonnet 39 is provided with a handle 35 for steering the airframe, a speed change operation lever 36 for operating the continuously variable transmission 14 and the seedling planting portion 4, and a sub-speed changeover device (not shown) for switching the travel transmission of the travel vehicle body 2. A sub-shift operation lever 37 and the like for operation are provided. In the present embodiment, the speed change operation lever 36 functions as an operating tool including an elevating operation member that operates the elevating cylinder 25 and a work on / off member that switches the seedling planting unit 4 between a working state and a non-working state.

  In addition, a front cover 40 that can be opened and closed is provided on the front side of the bonnet 39, and the front and right front wheels 10, 10 and the left and right front wheel final cases 10a, An interlocking mechanism (not shown) for rotating the lower side of 10a is provided.

  An engine cover 30a that covers the upper and side portions of the engine 30 is provided behind the bonnet 39 and above the engine 30, and a control seat 41 on which an operator sits on the upper portion of the engine cover 30a. Is provided.

  Further, the fertilizer application 5 is mounted on the rear side of the control seat 41 and on the rear end side of the main frame 15. The driving force of the fertilizer application 5 is transmitted by a fertilizer transmission mechanism (not shown) provided to face the fertilizer application 5 from the left and right sides of the left and right rear wheel gear cases 11a.

  Meanwhile, substantially horizontal floor steps 33 are formed on the left and right sides of the engine cover 30a and the hood 39. As shown in FIG. 2, the floor step 33 is partly in a lattice shape, and mud on the shoe of the worker walking on the floor step 33 falls on the field. Moreover, as shown in FIG. 2, the seedling transplanter according to the present embodiment has left and right extension steps 34, 34 arranged on both the left and right sides of the floor step 33, respectively.

  A rear step 330 (see FIG. 2) is connected to the rear of the floor step 33, and an extended rear step 340 is extended to the rear of the extension step. The surfaces of the rear step 330 and the extension step 34 are preferably subjected to, for example, an anti-slip process in which a plurality of protrusion patterns are formed so that the feet are less likely to slip when working.

  Further, as shown in the drawing, on the front side and the left and right sides of the traveling vehicle body 2, there are provided preliminary seedling frames 50 in which a plurality of preliminary seedling mounts 52 are arranged on the seedling frame column 51 at intervals in the vertical direction. Work materials such as seedlings and fertilizer bags to be replenished to the planting unit 4 can be placed.

  In addition, a seedling tank 53 for loading seedlings to be planted in the field is mounted at the rear end portion of the lifting link mechanism 3 together with a sliding mechanism (not shown) that slides in the left-right direction. Such a seedling tank 53 is provided with seedling partitioning fences 54 that are long in the vertical direction and spaced apart from each other at a predetermined interval. Under the seedling tank 53, a seedling planting device that scrapes the loaded seedlings and plants them in the field. 55 is arranged.

  The number of seedling planting devices 55 is the same as the number of planting work strips divided by the seedling partition fence 54, that is, in this application, eight plants are planted simultaneously, and the planting transmission case 56 is spaced below the seedling tank 53. Four planting rotaries 57 and 57 are mounted for planting seedlings and planting them in the field while rotating to the left and right sides of the planting transmission case 56.

  Further, the fertilizer application device 5 partitions the fertilizer hopper 70 that stores fertilizer into the same number as the number of work strips of the seedling planting unit 4 (eight strips in this embodiment). In addition, since the fertilizer hopper 70 for 8 strips is long in the left-right direction, and the convenience of putting in and removing the fertilizer is reduced, the configuration in which the interior is partitioned into 4 strips may be arranged on the left and right.

  At the bottom of the fertilizer hopper 70, a feeding device 71 for supplying fertilizers by a set amount is provided for each line, and a ventilation duct 72 through which conveying air for moving the fertilizer passes below the feeding device 71 extends in the left-right direction of the body. Provided. And the fertilizer hose 73 which guides a fertilizer in the vicinity of the seedling planting position of the seedling planting part 4 is provided in the downward position of each feeding apparatus 71. In addition, a blower 74 that is operated by a blower electric motor 76 to generate conveyance air is provided at one end of the ventilation duct 72 on one side of the machine body.

  Further, as shown in FIGS. 1 and 2, below the seedling planting portion 4, a center float 62C that slides in contact with a farm scene and two left and right side floats 62L and 62R rotate around the axis. It is provided freely. The center float 62C and the left and right side floats 62L and 62R may be collectively referred to as a float 62 in some cases.

  A leveling rotor 63 (FIG. 1) for leveling the unevenness of the field scene is provided below the seedling planting unit 4 and on the front side of the machine body from the float 62. The driving force of the leveling rotor 63 can be obtained from the left and right rear wheel case 11a via the rotor transmission shaft 63a.

  Further, as shown in FIG. 1, on both the left and right sides of the seedling planting part 4, a drawing marker is formed so that either the left or the right is grounded on the farm scene and a groove is formed as a guide for traveling on the next work strip. 65, 65 are provided. The left and right drawing markers 65, 65 are spaced apart from each other when the left and right sides are grounded. When the seedling planting part 4 is raised during turning, both the left and right are separated upward, and seedlings are planted after turning. When the part 4 is lowered, the left and right sides are separated upward and the left and right other sides are grounded.

  As shown in FIGS. 1 and 2, a center mascot 66 that is long in the vertical direction is provided at the center of the left and right sides of the traveling vehicle body 2 and in front of the hood 39. By aligning the center mascot 66 with the groove formed by the left and right drawing markers 65, 65 in the field, it becomes possible to travel according to the work position of the immediately preceding work strip, improving work accuracy and generating non-work positions. Can be prevented.

  Depending on the soil quality of the field, the guide line formed by the left and right drawing markers 65, 65 may be buried immediately, and the straight travel guide may disappear. At this time, the left and right side markers 19 provided on the front side of the aircraft relative to the left and right drawing markers 65 and 65 may be used. That is, by moving the left and right side markers 19 outward of the machine body and positioning the side markers 19 above the planted seedlings, it becomes possible to perform a planting operation in accordance with the planting of the seedlings of the previous working strip. .

  In the above configuration, a characteristic configuration of the seedling transplanter according to the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is an explanatory diagram illustrating a control mechanism of the seedling transplanting unit 4 of the seedling transplanting machine according to the present embodiment, and FIG. 4 is an explanatory diagram illustrating the switching unit 200.

  As shown in FIG. 3, the seedling transplanter according to the present embodiment includes a work device control mechanism 300 that controls the operation of the seedling planting unit 4.

  The work device control mechanism 300 switches the operation of the controller 100 as a control unit that controls the lifting operation and work operation of the seedling planting unit 4, the electric motor 110 whose operation is controlled by the controller 100, and the operation of the lifting cylinder 25. A switching valve 130. Furthermore, the work device control mechanism 300 includes a switching arm 120 that is rotated by the electric motor 110 and moves the spool 131, and a rotation sensor 140 that detects the amount of rotation of the switching arm 120.

  The electric motor 110 functions as a drive unit that operates in response to an operation of an elevating operation switch 361 that is an elevating operation member provided on the shift operation lever 36 or a work on / off switch 362 that is a work on / off member. In addition, the shift operation lever 36 according to the present embodiment is also provided with a continuous lowering operation switch 363 that is a continuous lowering operation member for continuously lowering the seedling planting unit 4 as shown in the figure.

  The controller 100 is electrically connected to the electric motor 110, the rotation sensor 140, and the link rotation sensor 31 that detects the rotation position of the elevating link mechanism 3, and the solenoid that operates the planting clutch 27. And an operating device 271 such as a motor. The link rotation sensor 31 may be anything as long as it can detect the rotation position of the elevating link mechanism 3. For example, a potentiometer can be preferably used.

  Then, the controller 100 transfers the seedlings based on the operation of the elevating operation switch 361 or the work on / off switch 362 and the detection value of the rotation sensor 140 when the elevating operation switch 361 or the work on / off switch 362 is operated. The lifting / lowering operation and work operation of the unit 4 are controlled.

  That is, the controller 100 according to the present embodiment stops the electric motor 110 when the value detected by the rotation sensor 140 reaches a predetermined value. As described above, when the value detected by the rotation sensor 140 reaches a predetermined value, the controller 100 stops the electric motor 110, so that a more reliable operation can be performed even with a mechanical configuration. The operation control of the seedling planting unit 4 by the controller 100 will be described in detail later.

  The switching valve 130 is configured to open and close a predetermined port by the movement of the spool 131 and switch the operation of the elevating cylinder 25. With this configuration, the lifting / lowering operation of the lifting / lowering link mechanism 3 can be switched to the rising mode, the lowering mode, and the lifting / lowering stop mode. Hereinafter, the lifting / lowering stop mode may be referred to as a neutral mode.

  In the seedling transplanting machine according to the present embodiment, the switching arm 120, the electric motor 110, the rotation sensor 140, and the switching valve 130 described above are attached to a common mounting plate 210 that is detachably attached to the main frame 15 of the traveling vehicle body 2. The switching unit 200 is configured by being arranged.

  That is, as shown in FIG. 4, the mounting plate 210 has a component mounting surface formed on the inner and outer surfaces and an outer shape appropriately formed, and is detachably mounted on the main frame 15. The attachment plate 210 is provided with a plurality of attachment holes 215 as holes, and can be attached to the main frame 15 by inserting attachment members such as bolts into the attachment holes 215. In the present embodiment, the mounting plate 210 is fixed at three locations.

  As described above, since the constituent members of the switching unit 200 are arranged together on the mounting plate 210, they can be removed from the traveling vehicle body 2 together with the mounting plate 210. Therefore, when maintenance work of the switching unit 200 is performed, maintenance work is improved because an extra part attaching / detaching work or the like becomes unnecessary.

  By the way, the switching arm 120 includes a rotating arm 122 rotated by the electric motor 110 and an interlocking arm 121 that rotates in conjunction with the rotating arm 122 and switches the switching valve 130. That is, it is the interlocking arm 121 that directly contacts the spool 131 of the switching valve 130. The interlocking arm 121 and the switching valve 130 are disposed outside the mounting plate 210, while the electric motor 110 and the rotating arm are arranged. 122 and the rotation sensor 140 are disposed inside the mounting plate 210.

  Therefore, it is possible to prevent water and mud from adhering to at least the electric motor 110 and the rotation sensor 140, which are electrical components, and to prevent failure and damage due to the adhesion of water and mud.

  Thus, in this embodiment, the electric motor 110 is activated by operating the elevating operation switch 361 or the work on / off switch 362 provided on the speed change operation lever 36, and the switching valve 130 is switched by the switching arm 120. . That is, when the electric motor 110 is operated, the interlocking arm 121 of the switching arm 120 pushes the spool 131 of the switching valve 130, and as a result, the raising / lowering operation of the seedling planting unit 4 is performed in the ascending mode, descending mode, and ascending / descending stop mode. Can be switched to.

  FIG. 5 is a schematic explanatory view showing the operation of the switching arm 120 and the operation of the automatic lifting arm 250. With reference to FIG. 5A, the operation of the switching arm 120 (interlocking arm 121), The operation of the interlocking switching valve 130 will be described below.

  As shown in FIG. 5A, the switching arm 120 rotates around the connecting shaft 111 a by driving the electric motor 110, and takes the positions A to D that regulate the forward and backward positions of the spool 131 of the switching valve 130. be able to. Here, the A position is a position where the switching valve 130 is switched to the ascending mode (a mode in which the elevating link mechanism 3 is raised). Further, the position B is a position where the switching valve 130 is switched to a lift stop mode (a mode in which the lift link mechanism 3 is stopped). The C position is a position where the switching valve 130 is switched to a lowering mode (a mode in which the lifting link mechanism 3 is lowered).

  On the other hand, the D position is a position indicating the operation “ON”, that is, a position where the planting clutch 27 of the seedling planting unit 4 is switched to “ON”, and is separated from the spool 131 of the switching valve 130 without contacting. Position. That is, the switching arm 120 is rotated by the electric motor 110 and is rotated to a position where the spool 131 of the switching valve 130 cannot be pushed.

  Thus, by switching the switching valve 130, the working height of the seedling planting unit 4 and the on / off of the operation are mechanically switched. Therefore, the work device control mechanism 300 according to the present embodiment can improve its maintainability while having an inexpensive configuration. Further, since the operation members of the seedling planting unit 4 are concentrated on the speed change operation lever 36, it is not necessary to operate a plurality of operation levers and the operability is improved.

  The mounting plate 210 further has a hole (not shown) through which a mounting member for mounting the electric motor 110 and the rotation sensor 140 is inserted. As shown in FIGS. 1 and 2, the switching unit 200 including the mounting plate 210 is disposed on the outer side of the control seat 41 provided in the left and right center portion of the traveling vehicle body 2, and is provided with bolts, screws, and the like. The mounting member can be inserted into the hole from the outside of the traveling vehicle body 2.

  That is, although the electric motor 110 and the rotation sensor 140 are disposed inside the mounting plate 210, maintenance work of the switching unit 200 including them can be performed from the outside of the vehicle body. Therefore, it is not necessary for the worker to take an unreasonable posture during the work, and the work efficiency can be improved and the labor of the worker can be reduced.

  In addition, when the seedling planting operation is performed on the mounting plate 210, the spool 131 is moved in accordance with the rotation of the float 62 (see FIGS. 1 and 2), and the switching valve 130 is switched to seedling planting. An automatic raising / lowering arm 250 for automatically raising / lowering the appendage 4 is provided.

  That is, as shown in FIG. 4, the automatic elevating arm 250 is connected to, for example, the center float 62C (see FIGS. 1 and 2) via the connecting wire 270, and one end is supported on the mounting plate 210 side. The spring 260 is urged away from the switching valve 130.

  Here, the operation of the automatic lifting arm 250 that rotates independently of the switching arm 120 that is rotated by the electric motor 110 will be described with reference to FIG.

  When the seedling planting part 4 is performing seedling planting work, when the farm field becomes shallow, the tip side of the center float 62C floats and rotates upward. At this time, the connecting wire 270 is pulled so that the automatic lifting arm 250 pushes the spool 131 of the switching valve 130 around the rotation shaft 111b (for example, the position A in the figure), as shown in FIG. ), The elevating link mechanism 3, that is, the seedling planting portion 4 is raised.

  On the other hand, when the depth of the field changes, the tip side of the center float 62C rotates downward and the connecting wire 270 is loosened, the automatic lifting arm 250 is separated from the spool 131 of the switching valve 130 by the spring 260, for example, C It rotates to the position between D (see the position indicated by the alternate long and short dash line). At this time, the seedling planting unit 4 is lowered until the center float 62C is in a grounded state.

  As described above, when the center float 62C is grounded, that is, when the connecting wire 270 is not pulled or loosened too much, the automatic lifting arm 250 is in a state where the spool 131 of the switching valve 130 is slightly pushed. (See position indicated by solid line). Therefore, the seedling planting part 4 does not move up and down in such a state.

  The operation of the automatic elevating arm 250 is limited to the case where the seedling planting clutch 27 is “ON” and the spool 131 of the switching valve 130 is in the protruding state. For example, when the switching arm 120 is at the position C or closer to the side where the spool 131 is pushed in, the automatic lifting arm 250 is located at a position separated from the tip of the spool 131. Therefore, even if the center float 62C moves up and down, the automatic lifting arm 250 does not come into contact with the spool 131, so that the seedling planting unit 4 does not automatically move up and down.

  By the way, as shown in FIG. 4, a valve block lever 135 and a float sensitivity adjustment lever 280 are arranged in parallel in the thickness direction of the mounting plate 210 inside the mounting plate 210.

  The valve block lever 135 is a lever that can switch the switching valve 130 to the locked state, and the float sensitivity adjustment lever 280 changes the pulling amount by the connecting wire 270 that rotates the automatic lifting arm 250 to change the switching valve 130. This is a lever that adjusts the amount of rotation of the center float 62C that brings the operating state to the operating state. In the present embodiment, lever locking recesses (not shown) are formed at a predetermined interval on the upper edge 220 of the mounting plate 210, and the float sensitivity adjusting lever 280 is locked to the predetermined recesses, whereby the center float is formed. The amount of rotation of 62C can be adjusted.

  As described above, since the float sensitivity adjusting lever 280 and the valve block lever 135 are also provided on the mounting plate 210 so that the members are centrally arranged, the number of mounting parts can be reduced, and the efficiency of the mounting work of the parts and the cost reduction are reduced. Can be achieved. Further, since the float sensitivity adjusting lever 280 and the valve block lever 135 can be provided near the control seat 41, the operator can change the automatic lifting condition of the lifting link mechanism 3 without moving from the control seat 41, Since the switching valve 130 can be switched to the locked state, the work efficiency is improved.

  Here, the operation control of the seedling planting unit 4 by the controller 100 will be described with reference to FIGS. FIGS. 6 and 7 are flowcharts showing an example of operation control of the lifting link mechanism 3 according to the operation of the lifting operation switch 361. FIG. 8 shows operation control of the lifting link mechanism 3 according to the operation of the work on / off switch 362. It is a flowchart which shows an example. FIG. 9 is a flowchart showing an example of operation control of the elevating link mechanism 3 according to the operation of the continuous lowering operation switch 363.

  As shown in FIG. 6, when the controller 100 detects that the lifting operation switch 361 has been lifted (step S100), the value detected by the rotation sensor 140 is regarded as the lifting stop (neutral) mode or the descending mode. It is determined whether or not (step S110).

  When the detected value of the rotation sensor 140 can be regarded as the up / down stop mode or the down mode (step S110: Yes), the controller 100 operates the electric motor 110 to rotate the switching arm 120 and switch the switching valve 130. Then, the elevating link mechanism 3 is raised (step S120).

  On the other hand, when the detected value of the rotation sensor 140 cannot be regarded as the up / down stop mode or the descending mode (step S110: No), the process proceeds to step S130 to determine whether the detected value can be regarded as the ascending mode. judge.

  When the detected value can be regarded as the rising mode (step S130: Yes), the controller 100 moves the process to step S110 without accepting the operation, whereas when the detected value cannot be regarded as the rising mode (step S130: No). ), It is determined whether or not the detected value can be regarded as a planting clutch “ON” (step S140).

  Then, when the detected value cannot be regarded as the planting clutch “ON” (step S140: No), the controller 100 ends this control process. When the detected value can be regarded as “planting clutch” (step S140: Yes), the planting clutch 27 is disconnected (step S150), the seedling planting unit 4 is switched to the non-working state, and then the electric motor 110 is operated to rotate the switching arm 120 to switch the switching valve 130 and raise the lifting link mechanism 3 (step S120).

  Next, the case where the raising / lowering operation switch 361 is lowered will be described. As shown in FIG. 7, when the controller 100 detects that the raising / lowering operation switch 361 is lowered (step S200), the value detected by the rotation sensor 140 is regarded as the raising / lowering stop (neutral) mode or the raising mode. It is determined whether or not (step S210).

  The detection value of the rotation sensor 140 is not regarded as the up / down stop mode or the ascending mode, and the position indicating the descending mode or the operation “ON”, that is, the planting clutch 27 of the seedling planting unit 4 is switched to “ON”. When it can be regarded as a position (step S210: No), the controller 100 does not accept a lowering operation of the elevating operation switch 361. On the other hand, when the detected value of the rotation sensor 140 can be regarded as the up / down stop mode or the up mode (step S210: Yes), the controller 100 operates the electric motor 110 to rotate the switching arm 120 to switch the switching valve 130. The switching and elevating link mechanism 3 is lowered (step S220).

  As described above, according to the working device control mechanism 300 according to the present embodiment, the controller 100 determines that the detected value of the rotation sensor 140 indicates that the seedling planting unit 4 operates when the lifting operation switch 361 is lifted. In the case of a value that can be regarded as medium, the seedling planting unit 4 is brought into a non-working state, the switching motor 120 is rotated by operating the electric motor 110, and the switching valve is set so that the lifting link mechanism 3 is in the lifting mode. 130 can be switched.

  Therefore, the seedling planting unit 4 does not operate at a position away from the farm scene, and for example, seedlings are not wasted when planting.

  Next, operation control for the seedling planting unit 4 when the work on / off switch 362 is operated will be described. As shown in FIG. 8, when it is detected that the work on / off switch 362 has been operated (step S310), the controller 100 considers that the value detected by the rotation sensor 140 is the lift stop (neutral) mode or the lift mode. It is determined whether or not (step S320).

  When the detected value of the rotation sensor 140 can be regarded as the up / down stop mode or the upper mode (step S320: Yes), the controller 100 operates the electric motor 110 to rotate the switching arm 120 to switch the switching valve 130. Then, the elevating link mechanism 3 is lowered (step S330).

  On the other hand, when the detected value of the rotation sensor 140 cannot be regarded as the up / down stop mode or the upward mode (step S320: No), the process proceeds to step S340, and whether or not the detected value can be regarded as the descending mode is determined. judge.

  When it is determined that the detected value can be regarded as the descending mode (step s340: Yes), the controller 100 operates the electric motor 110 to rotate the switching arm 120 to the position of the work “ON”, and planting The seedling planting unit 4 is put into a working state as a clutch “ON” (step S350), and then the present control process is finished.

  On the other hand, when it is determined in step S340 that the detected value cannot be regarded as the descending mode (step S340: No), the controller 100 determines whether or not the detected value is regarded as the planting clutch “ON”. However, if the detected value cannot be regarded as the planting clutch “ON” (step S360: NO), the present control process ends.

  In step S360, when it is determined that the detected value can be regarded as a planting clutch “ON” (step S360: YES), the controller 100 operates the electric motor 110 to rotate the switching arm 120 to switch the switching valve. 130 is switched, the elevating link mechanism 3 is lowered (step S330), and then this control process is finished.

  As described above, according to the work device control mechanism 300 according to the present embodiment, the controller 100 indicates that the detected value of the rotation sensor 140 indicates that the lift link mechanism 3 is in the lift mode when the work on / off switch 362 is operated. In the case of a value that can be regarded as an up / down stop (neutral) mode, the electric motor 110 is operated to switch the switching valve 130 so that the up / down link mechanism 3 is in the down mode. Further, when the work on / off switch 362 is operated and the detection value of the rotation sensor 140 is a value that the lifting link mechanism 3 can be regarded as the lowering mode, the electric motor 110 is operated to rotate the switching arm 120. The seedling planting unit 4 is further lowered to the working position, and the seedling planting unit 4 is put into a working state. Furthermore, when the work on / off switch 362 is operated, if the detected value of the rotation sensor 140 is a value that the seedling planting unit 4 can be considered to be working, the electric motor 110 is operated to switch the switching arm 120. The switch valve 130 is switched so that the elevating link mechanism 3 is in the descending mode, and the seedling planting unit 4 is brought into a non-working state.

  Therefore, since it can prevent that the seedling planting part 4 will be in a working state during the descent | fall of the raising / lowering link mechanism 3, it can prevent that the seedling planting part 4 act | operates in the position away from the field scene, for example, seedling planting It is possible to prevent wasteful consumption of seedlings during work. Since the single work on / off switch 362 can perform the operation of lowering the work height to the seedling planting portion 4 and the work on / off operation, the operability can be further improved and the number of parts can be reduced. .

  Next, operation control for the seedling planting unit 4 when the continuous lowering operation switch 363 is operated will be described. The continuous lowering operation switch 363 is provided in close proximity to the speed change operation lever 36 (see FIGS. 1 to 3) together with the above-described lifting operation switch 361 and work on / off switch 362.

  As shown in FIG. 9, when it is detected that the continuous lowering operation switch 363 has been operated (step S410), the controller 100 regards the value detected by the rotation sensor 140 as the up / down stop (neutral) mode or the up mode. It is determined whether or not (step S420).

  When it is determined that the value detected by the rotation sensor 140 can be regarded as the lift stop (neutral) mode or the lift mode (step S420: Yes), the controller 100 determines whether or not the operation of the continuous lowering operation switch 363 is continued. Is determined (step S430).

  If it is determined that the operation of the continuous lowering operation switch 363 is continued (step S430: Yes), the controller 100 moves the process to step S440, operates the electric motor 110, rotates the switching arm 120, and switches the switching valve 130. Are switched, the elevating link mechanism 3 is lowered (step S440), and then this control process is terminated.

  In step S420, if the value detected by the rotation sensor 140 cannot be regarded as the lift stop (neutral) mode or the lift mode (step S420: No), or in step S430, the operation of the continuous lowering operation switch 363 is performed. When it determines with not continuing (step S430: No), the controller 100 moves a process to step S450.

  In step S450, the controller 100 determines whether or not the operation of the continuous lowering operation switch 363 is interrupted. While waiting until the operation is interrupted (step S450: No), when it is determined that the operation is interrupted (step S450: Yes), the controller 100 operates the electric motor 110 and can be regarded as a lift stop (neutral) mode. The switching arm 120 is rotated to the position to stop the descent of the elevating link mechanism 3 (step S460), and then this control process is terminated.

  Thus, according to this embodiment, since the descent | fall position of the seedling planting part 4 can be adjusted finely, the precision and efficiency of a seedling planting operation | work improve.

  By the way, in the seedling transplanting machine according to the present embodiment, the turning position of the lifting / lowering link mechanism 3 is stopped before the turning position of the lifting / lowering link mechanism 3 is closer than the angle at which the lifting / lowering link mechanism 3 can be regarded as being in the raised state. I try to let them.

  That is, the controller 100 determines a predetermined angle (for example, 5 ° to 10 °) from an angle at which the link rotation sensor 31 that detects the rotation position of the lift link mechanism 3 can be regarded as the lift link mechanism 3 being in the lifted state. When a small angle is detected, the switching arm 120 is rotated to an angle at which the lifting / lowering operation of the lifting / lowering link mechanism 3 is in the lifting / lowering stop (neutral) mode by the electric motor 110 to stop the lifting / lowering of the lifting / lowering link mechanism 3 I have to.

  Thus, in the seedling transplanter according to the present embodiment, the lifting link mechanism 3 can operate the electric motor 110 at a position lower than the rising position to stop the lifting cylinder 25. Therefore, since the elevating link mechanism 3 can be rotated upward from when the electric motor 110 is activated until the elevating cylinder 25 is stopped, an unnecessary load is applied to the elevating link mechanism 3 and the elevating cylinder 25. Can be prevented.

  Next, other configurations of the seedling transplanter according to the present embodiment will be described. FIG. 10 is an explanatory view showing the arrangement of the retaining bolts of the differential lock arm 460 in the mission case 13. As shown in FIG. 10, the transmission case 13 is provided with a differential mechanism 400 via a differential clutch 410 that distributes torque by giving an appropriate rotational difference to the left and right front wheel electric shafts 440. A differential lock arm 460 connected to an on / off pin 470 for turning on / off the differential clutch 410 is attached. As shown in the figure, the on / off pin 470 is attached via an oil seal 430 and provided with a retaining bolt 420. In FIG. 10, reference numeral 450 denotes a rear wheel electric shaft provided via a side brake side clutch 480.

  In this configuration, conventionally, the retaining bolt 420 of the differential lock arm 460 is provided on the center side of the case with respect to the oil seal 430. However, in this embodiment, the retaining bolt 420 is provided on the outer side of the oil seal 430. .

  That is, each time the transmission case 13 is disassembled, it has been necessary to replace the retaining bolt with a seal with a new one to prevent oil leakage. The retaining bolt 420 can be reused, and it is not necessary to replace it. Moreover, since the retaining bolt 420 is disposed outside the oil seal 430, it is not necessary to provide a sealing function, and the cost of parts can be reduced.

  FIG. 11 is an explanatory diagram of the planting clutch 27, and FIG. 12 is an explanatory diagram showing the planting clutch pin. As shown in FIG. 11, adjacent to the mission case 13, a planting transmission shaft 510 that transmits the external extraction power input from the mission case 13 to the seedling planting unit 4 is provided via the planting clutch 27. ing.

  The planting clutch 27 includes a planting clutch pin 520, a clutch pawl 530, and a spring 540. The clutch pawl 530 is mounted on the outer periphery of the planting output shaft 550, and the planting output shaft 550 is biased to the opposite side of the planting transmission shaft 510 by a spring 540. When the planting clutch pin 520 is pressed, the clutch pawl 530 falls into a groove formed on the outer periphery of the clutch pawl 530, whereby the planting output shaft 550 is slid to disengage the clutch. In addition, the diameter (phi) of the planting clutch pin 520 which concerns on this embodiment is 10 mm.

In such a configuration, conventionally, as shown in FIG. 12B, the taper angle θ ₂ of the chamfered portion formed at the tip of the planting clutch pin 520 has been 45 °. Therefore, for example, when the planting clutch 27 is disengaged during low-speed rotation, the planting clutch pin 520 may not easily fall into the groove at the clutch stop position. Further, at the time of high-speed rotation, the planting clutch pin 520 is rebounded, so that it is difficult for the planting clutch pin 520 to fall into the groove and the clutch is difficult to be disconnected.

Therefore, in this embodiment, as shown in FIG. 12 (a), the taper angle theta ₁ of the chamfered portion formed at the tip of the planting clutch pin 520 is set to 30 °. In this manner, by changing the taper angle, the planting clutch pin 520 can easily fall into the groove portion at low speed or high speed, and the operation of the planting clutch 27 is further stabilized.

  Next, the arrangement of the battery 600 will be described. FIG. 13 is an explanatory diagram showing the arrangement of the battery 600. In the seedling transplanter, a battery stay 610 connected to a battery receiver 620 on which the battery 600 is placed is attached in the middle of the seedling frame column 51 that supports the preliminary seedling placing stand 52 provided on the front side of the traveling vehicle body 2.

  Conventionally, as shown in FIG. 13B, since the battery stay 610 is provided close to the support rod 190 of the side marker 19, the arrangement structure including the battery 600 can be viewed from the control seat 41 with respect to the side marker 19. It was a factor that hinders.

  Therefore, in the present embodiment, as shown in FIG. 13A, the battery stay 610 is attached so as to be positioned above the support rod 190 of the side marker 19 by a predetermined distance h, and the battery 600 and the side marker 19 are A space was formed between the support rod 190 and the support rod 190. With this configuration, the visibility of the side marker 19 from the control seat 41 (see FIG. 1) is significantly improved.

  Next, the hydraulic circuit of the seedling transplanter will be described. FIG. 14A is an explanatory diagram illustrating an example of a hydraulic circuit of the seedling transplanter, and FIG. 14B is an explanatory diagram illustrating a comparative example of the hydraulic circuit of the seedling transplanter.

  As shown in FIGS. 14A and 14B, the hydraulic circuit includes an oil tank 720, a gear-type oil pump 740, and an oil filter 730. The oil pump 740 includes a power steering mechanism 700, a lifting cylinder 25, and a continuously variable transmission. A device (HST) 14 is connected.

  Conventionally, as shown in FIG. 14B, a flow dividing valve 710 is provided immediately downstream of the oil pump 740, and the flow path is branched to the power steering mechanism 700 side and the continuously variable transmission 14 by the flow dividing valve 710. . For this reason, if a situation in which a large amount of oil is supplied to the continuously variable transmission 14 or the lifting cylinder 25 continues, the supply flow rate of the oil to the power steering mechanism 700 tends to be smaller than the required flow rate. Then, it is difficult to operate the handle 35 lightly.

  Therefore, in the present embodiment, as shown in FIG. 14A, the oil pump 740 and the power steering mechanism 700 are directly connected, and the flow dividing valve 710 is disposed on the downstream side of the power steering mechanism 700. That is, oil is first supplied to the power steering mechanism 700 and then branched to the switching valve 130 side and the continuously variable transmission 14 side by the diversion valve 710.

  With this configuration, the necessary flow rate of the power steering mechanism 700 can be reliably ensured, and the operation of the handle 35 can be performed smoothly all the time.

(Other embodiments)
Here, a hydraulic circuit in a seedling transplanter according to another embodiment will be described. FIG. 15 is an explanatory diagram illustrating an example of a hydraulic circuit of a seedling transplanter according to another embodiment.

  In FIG. 15, reference numeral 690 indicates an oil tank, reference numeral 691 indicates a filter, and reference numeral 692 indicates a gear-type oil pump. A power steering mechanism 630, a control valve 640, a hydraulic cylinder 660, and a continuously variable transmission (HST) 680 are connected to the oil pump 692. The control valve 640 corresponds to the switching valve 130 in the embodiment described above. The hydraulic cylinder 660 corresponds to the lifting cylinder 25 in the above-described embodiment. Reference numeral 650 denotes an accumulator, which is provided between the control valve 640 and the hydraulic cylinder 660.

  In the above configuration, since a heavy load is applied to the hydraulic cylinder 660 that lifts and lowers the ground work device (for example, the seedling planting unit 4), which is a heavy object, there is a risk of oil leaking inside the cylinder. If oil leakage occurs, the ground work device will naturally fall even if it is in the raised position. In that case, if the ground working device is a seedling planting device, the seedling planting device will descend further below the specified position when planting starts, so the seedling planting depth will vary. End up.

  Therefore, in this embodiment, a needle valve 670 having a variable throttle function of the oil flow rate is provided between the control valve 640 and the hydraulic cylinder 660. Thereby, the natural descent | fall of the seedling planting part 4 is suppressed, and it becomes possible to suppress the variation in the planting depth at the time of seedling planting work.

  Note that an adapter (not shown) is provided in the port of the control valve 640, and an orifice is formed in the adapter. In the needle valve 670 according to this embodiment, the maximum opening area of the flow path is set to be equivalent to the sectional area of the orifice. Therefore, it is not necessary to form an orifice in the adapter, and the cost of the adapter can be reduced.

  Further, the housing of the needle valve 640 is the same as the housing material of other valves. In this way, by sharing the material, the mold cost or the like becomes unnecessary, so that the cost can be reduced.

  As described above, the seedling planting machine, which is a work vehicle according to the present embodiment, is provided on the traveling vehicle body 2 having the left and right traveling wheels 10, 10, 11, 11 and the rear part of the traveling vehicle body 2. The raising / lowering link mechanism 3 which raises / lowers the seedling planting part 4 which is an apparatus, the raising / lowering cylinder 25 which raises / lowers the raising / lowering link mechanism 3, and the raising / lowering operation switch which operates the raising / lowering cylinder 25 as an operation tool which operates the seedling planting part 4 361 and a shift operation lever 36 including a work on / off switch 362 for switching the seedling planting unit 4 between a working state and a non-working state, and seedling planting according to the operation of the elevating operation switch 361 or the work on / off switch 362 And a work device control mechanism 300 that controls the lifting and lowering of the unit 4.

  Then, the work device control mechanism 300 rotates the switching valve 130 that switches the operating direction of the elevating cylinder 25 by the movement of the spool 131, the switching arm 120 that rotates to move the spool 131 of the switching valve 130, and the switching arm 120. The electric motor 110 as a drive unit to be moved, the rotation sensor 140 that detects the rotation amount of the switching arm 120 rotated by the electric motor 110, and the electric motor according to the operation of the lifting operation switch 361 or the work on / off switch 362 The controller 100 is a controller that controls the operation of the electric motor 110 and stops the operation of the electric motor 110 when at least the rotation amount detected by the rotation sensor 140 reaches a predetermined amount.

  Therefore, the mechanism for controlling the seedling planting unit 4 does not require a high-performance control device or the like required when using an electromagnetic valve, and can improve the maintainability even though it is an inexpensive configuration. Further, for example, it is not necessary to operate a plurality of operation levers and the operability is improved.

  Each embodiment described above is merely an example, and is not intended to limit the scope of the invention. Each embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. In addition, specifications (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) of each configuration, shape, display element, etc. are changed as appropriate. Can be implemented.

2 Traveling body 3 Elevating link mechanism 4 Seedling planting part (facing work device)
15 Main frame 25 Elevating cylinder 36 Shift operation lever (operating tool)
100 controller (control unit)
110 Electric motor (drive unit)
DESCRIPTION OF SYMBOLS 120 Switching arm 121 Interlocking arm 122 Rotating arm 130 Switching valve 131 Spool 135 Valve block lever 140 Rotation sensor 200 Switching unit 210 Mounting plate 215 Hole part 250 Automatic raising / lowering arm 260 Spring 270 Connecting wire 280 Float sensitivity adjustment lever 361 Elevating operation switch (Elevating operation member)
362 Work on / off switch (work on / off member)
363 Continuous lowering operation switch (continuous lowering operation member)

Claims (9)

An elevating link mechanism that is provided at the rear of the traveling vehicle body and elevates and lowers the ground work device;
An elevating cylinder that causes the elevating link mechanism to elevate;
An operation tool comprising an elevating operation member that operates the elevating cylinder, and a work on / off member that switches the ground work device between a working state and a non-working state;
A switching valve for switching the operation of the lifting cylinder by moving the spool;
A drive unit that operates in response to an operation of the lifting operation member or the work turning member;
A switching arm that is rotated by the drive unit to move the spool;
A rotation sensor for detecting a rotation amount of the switching arm;
Based on the operation of the elevating operation member or the work on / off member and the detected value of the rotation sensor at the time of operating the elevating operation member or the work on / off member, the elevating operation and the working operation of the ground work device are performed. A control unit to control;
A work vehicle comprising: The switching valve can switch the ascending / descending operation of the elevating link mechanism to an ascending, descending, and ascending / descending stop mode,
The controller is
The work vehicle according to claim 1, wherein the driving unit is stopped when a value detected by the rotation sensor reaches a predetermined value. The controller is
When the detected value of the rotation sensor is a value that the ground working device can be regarded as working when the lifting operation member is lifted, the ground working device is brought into a non-working state and the drive 3. The work vehicle according to claim 2, wherein the switching valve is switched so that the switching arm is rotated by rotating the switching arm so that the elevating link mechanism is in a rising mode. The controller is
When the work on / off member is operated, if the detected value of the rotation sensor is a value that the lift link mechanism can be regarded as the lift mode or the lift stop mode, the drive unit is operated, Switch the switching valve so that the lifting link mechanism is in the descending mode,
When the detected value of the rotation sensor is a value that can be regarded as the descending mode when the operation on / off member is operated, the drive unit is operated to rotate the switching arm. , Further lowering the ground work device to the work position, and put the ground work device in the working state,
Further, when the detected value of the rotation sensor is a value that the ground work device can be considered to be working when the work on / off member is operated, the drive unit is operated to rotate the switching arm. 4. The work vehicle according to claim 2, wherein the work vehicle is moved to switch the switching valve so that the elevating link mechanism is in a descending mode, and the ground work device is set to a non-working state. The operation tool is provided with a continuous lowering operation member for continuously lowering the ground work device,
The controller is
When the detected value of the rotation sensor is a value that the elevator link mechanism can be regarded as the ascending mode or the ascending / descending mode, the operation of the continuously descending operation member is continued. Then, while switching the switching valve so that the lifting link mechanism is in the lowering mode via the switching arm, when the operation of the continuous lowering operation member is interrupted, the drive unit is operated, The work vehicle according to any one of claims 2 to 4, wherein the switching valve is switched via the switching arm so that the lifting link mechanism is in the lifting stop mode. The switching arm includes a rotating arm that is rotated by the driving unit, and an interlocking arm that switches the switching valve in conjunction with the rotating arm, the switching arm, the driving unit, the rotation sensor, And the switching valve is disposed on a common mounting plate that is detachably attached to the frame of the traveling vehicle body to constitute a switching unit,
While disposing the switching valve and the interlocking arm on the outside of the mounting plate,
The work vehicle according to any one of claims 1 to 5, wherein the drive unit, the rotation arm, and the rotation sensor are disposed inside the mounting plate. The mounting plate has a hole through which a mounting member for mounting the drive unit and the rotation sensor is inserted;
The switching unit including the mounting plate is disposed on the outer side of the steering seat provided at the left and right center portion of the traveling vehicle body, and the mounting member can be inserted into the hole from the outside of the traveling vehicle body. The work vehicle according to claim 6. A float that can be grounded to a farm scene and is pivotally attached to a lower portion of the ground work device;
An automatic lifting arm that moves the spool in accordance with the rotation of the float and can switch the switching valve;
A connecting wire connecting the float and the automatic lifting arm;
A spring for urging the automatic lifting arm in a direction away from the switching valve;
A float sensitivity adjusting lever that is disposed inside the mounting plate and adjusts the amount of rotation of the float that changes the pulling amount by the connecting wire that rotates the automatic lifting arm and brings the switching valve to an operating state. When,
A valve block lever disposed outside the mounting plate and switching the switching valve to a locked state;
The work vehicle according to claim 6, further comprising: A link rotation sensor for detecting a rotation position of the elevating link mechanism;
The controller is
When the link rotation sensor detects an angle that is smaller by a predetermined angle than an angle at which the lifting link mechanism can be regarded as being in an elevated state,
9. The drive unit causes the switching arm to rotate at an angle at which the lifting / lowering operation of the lifting / lowering link mechanism is in a lifting / lowering stop mode, and stops the lifting / lowering of the lifting / lowering link mechanism. The work vehicle according to any one of claims.

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