JP6544115B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle that travels while working in a field.

  Conventionally, as a working vehicle which travels while performing a predetermined work in a field etc., an elevation switch for raising and lowering a ground work device connected to a traveling vehicle body as a work operation lever, a ground work device in working and non-working states There is a switch provided with a changeover switch (see, for example, Patent Document 1).

  In this work vehicle, while operating the travel operation lever, operate the lift switch to switch the advance / retraction of the lift cylinder via the electromagnetic valve to raise or lower the seedling planting device which is the ground work device or operate the switch It is possible to operate the on / off of the planting clutch.

  With this configuration, the operator can perform the traveling operation and the raising and lowering operation of the seedling planting device and the seedling planting operation with one hand, the traveling operation and the operation of the seedling planting unit become simple, and the operability improves. .

JP, 2015-84673, A

  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 elevation of the elevation cylinder. Therefore, if a failure occurs, much time and labor are required for repair, and maintenance work may not be performed without appropriate knowledge and technology for electronic parts. In addition, the cost is likely to increase because many components are expensive.

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

In order to solve the problems described above and to achieve the object, the invention according to claim 1 causes the elevation link mechanism (3) to raise and lower the working device (4), and the elevation link mechanism (3) to raise and lower An elevating cylinder (25), a switching valve (130) for expanding and contracting the elevating cylinder (25), an elevating operation member (361) for operating the switching valve (130), and a float (62 ) for grounding the overhead scene Work vehicle provided with an automatic lift arm (250) capable of switching the switching valve (130) according to the rotation of the switching valve (130) , interlocking with the operation of the switching valve (130) and the lifting operation member (361) Driving member (110), a switching arm (120) for operating the switching valve (130) by actuation of the driving member (110), and the switching arm (120) The rotation sensor (140) for detecting a rotation amount, wherein the float float sensitivity adjustment lever for adjusting the amount of rotation of (62) (280), a valve lock lever to switch the switching valve (130) in a locked state (135 ) constitutes a switching unit (200) and the wearing to the mounting plate (210), said mounting plate (Rutotomoni detachably attached to 210) a run line body (2), the switching arm (120), It comprises a pivoting arm (122) which is pivoted by the drive member (110), and an interlocking arm (121) which switches the switching valve (130) interlockingly with the pivoting arm (122), the drive member (110), the rotation sensor (140) and the rotation arm (122) are provided on the inside of the mounting plate (210), and the float sensitivity The sections lever (280) and said valve lock lever (135), and a work vehicle, characterized in that it is arranged in the thickness direction of the mounting plate (210).

The invention according to claim 2 is characterized in that the work on / off member (362) for switching the work device (4) between the work state and the non-work state, the operation on the work on / off member (362) and the work on Further comprising a control unit (100) for controlling the lifting and lowering operation of the work device (4) and the work operation based on the detection value of the rotation sensor (140) at the time of operation of the cutting member (362). It was set as the work vehicle according to claim 1 characterized by the above.

In the invention according to claim 3, when the work on / off member (362) is operated, the control unit (100) detects the value detected by the rotation sensor (140) as the elevation link mechanism. When (3) is a value that can be regarded as the rising mode or the raising and lowering stop mode, the switching valve (130) operates so that the driving member (110) is operated and the raising and lowering link mechanism (3) enters the lowering mode. When the operation on / off member (362) is operated, the value detected by the rotation sensor (140) is a value that makes it possible for the elevation link mechanism (3) to be regarded as in the lowering mode. The member (110) is operated to turn the switching arm (120) to further lower the working device (4) to the working position, and put the working device (4) into a working state, and further, the work entry The cutting member (362) When the detected value of the rotation sensor (140) is a value such that the working device (4) can be regarded as being in operation, the drive member (110) is operated to switch the switching arm (120). the rotated, together with the lifting link mechanism (3) to switch the switching valve (130) so that the descending mode, to claim 2, characterized in that the working device (4) in a non-working state The work vehicle described.

A first related invention related to the inventions according to claims 1 to 3 is an elevator link mechanism (3) provided at the rear of a traveling vehicle body (2) to raise and lower the ground work device (4) And a lifting cylinder (25) for lifting and lowering operation by the lifting link mechanism (3), a lifting operation member (361) for operating the lifting cylinder (25), and a working condition and non-working of the ground working device (4) Operation tool (36) having a work on / off member (362) for switching to the state, a switching valve (130) for switching the operation of the elevating cylinder (25) by movement of the spool (131), and the elevating operation member (361) or a drive unit (110) that operates according to the operation of the work on / off member (362), and a switching arm (1) that is rotated by the drive unit (110) and moves the spool (131) 0), a rotation sensor (140) for detecting the amount of rotation of the switching arm (120), the operation of the elevation operation member (361) or the work on / off member (362), and the elevation operation member (361) And a control unit (100) for controlling the elevating operation and the work operation of the ground work device (4) based on the detection value of the rotation sensor (140) at the time of operation of the work on / off member (362) And the work vehicle characterized by having.
In the second related invention, the switching valve (130) can switch the elevating operation of the elevating link mechanism (3) to an ascending, descending, and elevating stop mode, and the control unit (100) The work vehicle according to the first related invention is characterized in that the drive unit (110) is stopped when the value detected by the rotation sensor (140) becomes a predetermined value .
Further, in the third related invention, the control unit (100) detects the value detected by the rotation sensor (140) when the elevation operation member (361) is operated to rise. ) Is considered to be during work, the ground work device (4) is put into a non-work state, the drive unit (110) is operated to turn the switching arm (120), and the elevation The work vehicle according to the second related invention is characterized in that the switching valve (130) is switched so that the link mechanism (3) is in the rising mode.
In the fourth related invention, the control unit (100) detects a value detected by the rotation sensor (140) when the work on / off member (362) is operated. Is operated in the ascending mode or the elevating stop mode, the drive unit (110) is operated to switch the switching valve (130) so that the elevating link mechanism (3) is in the descending mode. When the operation on / off member (362) is operated, if the detected value of the rotation sensor (140) is a value that makes it possible for the elevation link mechanism (3) to be regarded as in the lowering mode, 110) to rotate the switching arm (120) to further lower the ground working device (4) to the working position, and put the ground working device (4) into a working state, and further, the work entering Cutting member (362) is operated When the detected value of the rotation sensor (140) is a value that makes it possible to think that the ground work device (4) is working, the drive unit (110) is operated to switch the switching arm (120). While switching the switching valve (130) so that the lifting link mechanism (3) is in the lowering mode, and turning the ground working device (4) into a non-working state . Or the work vehicle according to the third related invention .

In the fifth related invention, the operation tool (36) is provided with a continuous lowering operation member (363) for continuously lowering the ground working device (4), and the control unit (100) When the detected value of the movement sensor (140) is a value that makes the lifting link mechanism (3) look like the rising mode or the lifting stop mode, the operation of the continuous lowering operation member (363) continues Operates the drive unit (110) to switch the switching valve (130) such that the lifting link mechanism (3) is in the lowering mode via the switching arm (120), while the continuous lowering When the operation of the operation member (363) is interrupted, the drive unit (110) is operated to move the elevation link mechanism (3) to the elevation stop mode via the switching arm (120). Switching valve And a working vehicle according to the second, characterized in that switch 130) one of the fourth related invention.

In the sixth related invention, the switching arm (120) is interlocked with a pivoting arm (122) rotated by the drive unit and the pivoting arm (122), and the switching valve (130). And an interlocking arm (121) for switching the switching arm (120), the drive unit (110), the rotation sensor (140), and the switching valve (130), the frame of the traveling vehicle body (2) (15) is mounted on a common mounting plate (210) detachably mounted to constitute a switching unit (200), the switching valve (130) and the interlocking arm (121), the mounting plate The drive unit (110), the pivoting arm (122), and the pivoting sensor (140) are disposed on the inside of the mounting plate (210) while being disposed outside the (210). And a working vehicle according to any one of the first, wherein the fifth associated invention that was.

In the seventh related invention, the mounting plate (210) has a hole (215) for inserting a mounting member for mounting the drive unit (110) and the rotation sensor (140), and the mounting The switching unit (200) including the plate (210) is disposed outside the steering seat (41) provided at the left and right center portions of the traveling vehicle body (2), and the mounting member is According to a sixth aspect of the present invention, there is provided the work vehicle according to the sixth aspect of the present invention , which is insertable into the hole (215) from the outside of 2).

The eighth related invention relates to a float (62) that can be grounded to a dredging scene and rotatably attached to the lower part of the ground work device (4), and the rotation of the float (62) Connecting wire (270) for connecting the automatic lift arm (250) capable of moving the spool (131) and switching the switching valve (130), the float (62) and the automatic lift arm (250) A spring (260) for urging the automatic lift arm (250) in a direction away from the switching valve (130); and an inner side of the mounting plate (210), the automatic lift arm (250) Sense of float that adjusts the amount of rotation of the float (62) that brings the switching valve (130) into operation by changing the amount of pulling by the connecting wire (270) that rotates the An adjusting lever (280), disposed outside the mounting plate (210), sixth and further comprising a valve lock lever (135) to switch the switching valve to (130) in the locked state or The work vehicle according to the seventh related invention is provided.

The ninth related invention further includes a link rotation sensor (31) that detects a rotation position of the elevating link mechanism (3), and the control unit (100) includes the link rotation sensor (31). When the elevation link mechanism (3) detects an angle smaller by a predetermined angle than the angle at which the elevation link mechanism (3) is considered to be in the elevation state, the elevation unit of the elevation link mechanism (3) stops elevation by the drive unit (110). wherein the angle at which the mode by rotating the switching arm (120), wherein the second, characterized in that stopping the increase rotation of the elevating link mechanism (3) in any one of the related inventions eighth Work vehicle.

In the work vehicle according to claim 1, the operation height of the work device (4) and the on / off of the operation are switched by the operation of the elevation operation member (361), so there is no need to operate a plurality of operation levers, operability Improve.
In addition, as the switching arm (120) for switching the switching valve (130) is rotated by the drive member (110), the elevating mechanism of the working device (4) can be simply configured, so that maintenance performance can be maintained. Improve.
The switching unit (200) is detachably mounted on the traveling vehicle body (2) by attaching a mounting plate (210) in which a plurality of members including the float sensitivity adjusting lever (280) and the valve lever (135) are concentrated. Since the constituent members of the above can be collectively removed, it is not necessary to attach and remove extra parts at the time of maintenance work, and the maintainability is improved. Moreover, since the float sensitivity adjustment lever (280) and the valve lock lever (135) can be provided near the control seat (41), the operator can move up and down the link mechanism without moving from the control seat (41). The change of the automatic raising and lowering condition of (3) and the switching valve (130) can be switched to the locked state, and the working efficiency is improved.
Further, by providing the drive member (110), the rotation sensor (140) and the rotation arm (122) inside the mounting plate (210), it is possible to prevent water or mud from adhering and damaging.

In the work vehicle according to claim 2, in addition to the effect of the invention according to claim 1 , the lowering operation to the working height for the working device (4) and the entering / closing operation of work with one work on / off member (362) Since the operation can be performed, the operability can be further improved, and the number of parts can be reduced .

In addition to the effects of the invention according to claim 2 , the work vehicle according to claim 3 can prevent the working device (4) from being in the working state during the descent of the elevation link mechanism (3), so It is possible to prevent the working device (4) from operating at a position away from the surface, and for example, it is possible to prevent wasteful consumption of working materials such as seedlings, fertilizers and drugs at the time of work.

In addition to the effects of the first to third aspects of the present invention, the work vehicle according to the first related invention includes an elevation operating member (361) or a work on / off member (362) provided in the operation tool (36). Is operated, the drive unit (110) is operated, the switching valve (130) is switched by the switching arm (120), and the working height and operation on / off of the ground work device (4) are mechanically switched. . Therefore, it is possible to improve the maintainability of the mechanism for controlling the ground work device (4) while having an inexpensive configuration. Further, for example, there is no need to operate a plurality of operating levers, etc., and the operability is also improved.
In the work vehicle according to the second related invention, in addition to the effects of the first related invention, the control unit (100) drives the drive unit (when the value detected by the rotation sensor (140) becomes a predetermined value). In order to stop 110), a more reliable operation can be performed despite the mechanical configuration.
In the work vehicle according to the third related invention, in addition to the effects of the first or second related invention, the ground work device (4) is working when the elevation operation member (361) is operated to rise. In this case, since the ground work device (4) is switched to the non-work state, it is possible to prevent the ground work device (4) from being operated at a position away from the scene. Therefore, wasteful consumption of working materials such as, for example, seedlings, fertilizers and medicines can be prevented.
Also, in addition to the effects of the second or third related invention , the work vehicle according to the fourth related invention detects the detection value of the rotation sensor (140) when the work on / off member (362) is operated. However, if the lifting link mechanism (3) is not in the lowering mode, the lifting link mechanism (3) is lowered. Then, when the operation on the work on / off member (362) is performed in the lowered state, the ground working device (4) is switched to the work entering. Therefore, since the ground working device (4) can be prevented from being in the working state during lowering of the lifting link mechanism (3), it can be prevented that the ground working device (4) is operated at a position away from the crawling scene For example, wasteful consumption of working materials such as seedlings, fertilizers and medicines can be prevented during work. In addition, when the detection value of the rotation sensor (140) makes the lifting link mechanism (3) think that it is in the lowering mode, the ground work device (4) is further lowered to the work position, and the ground work device (4) is When the working state is set and the detection value of the rotation sensor (140) can be regarded as that the ground work device (4) is working, the lift link mechanism (3) is in the lowering mode and the ground work device (4) ) Becomes unworked. Therefore, the lowering operation to the working height for the ground work device (4) and the turning on / off operation can be performed with one work on / off member (362), which can further improve the operability and reduce the number of parts. Can be

Further, the work vehicle according to the fifth related invention, the second in addition to the effect of any one invention of the fourth associated invention, the continuous descent operation member (363) operation is continued At this time, the lifting link mechanism (3) continues to be lowered, and when it is interrupted, the lowering of the lifting link mechanism (3) is stopped. Therefore, the descent position of the ground work device (4) can be finely adjusted, and work accuracy and work efficiency are improved.

Further, the work vehicle according to the sixth associated invention is, from the first in addition to the effect of any one invention of the fifth associated invention, the driving unit (110), a rotating arm (122), Since the rotation sensor (140) is disposed inside the mounting plate (210), it is possible to prevent damage or the like due to water or mud adhering to it. In addition, by detachably attaching the mounting plate (210), the constituent members of the switching unit (200) can be collectively removed from the traveling vehicle body (2), so extra parts are removed during maintenance work. No work is required and maintenance is improved.

In addition to the effects of the sixth related invention , the work vehicle according to the seventh related invention is configured so that the mounting member can be attached to the mounting plate (210) from the outside of the vehicle body. Only the (110) and the rotation sensor (140) can be attached and detached from the outer side of the vehicle body, and the removal operation of the extra parts and the like are unnecessary, thereby further improving the maintainability. Also, by arranging the switching unit (200) outside the vehicle body than the operation seat (41), maintenance work of the switching unit (200) can be performed from the outside of the vehicle body, so the worker takes an unreasonable posture at the time of work. There is no need to improve the working efficiency, and the labor of the worker can be reduced.

In the work vehicle according to the eighth related invention , in addition to the effects of the sixth or seventh related invention , the float sensitivity adjustment lever (280) and the valve lock lever (135) are also attached to the mounting plate (210). Since the members are provided in a concentrated arrangement, it is possible to reduce the number of attachment parts and the like, and to achieve the efficiency of the mounting operation and the cost reduction. In addition, since the float sensitivity adjustment lever (280) and the valve lock lever (135) can be provided near the control seat (41), the operator can move up and down the link mechanism without moving from the control seat (41). Since the change of the automatic raising and lowering conditions of (3) and the switching valve (130) can be switched to the locked state, the working efficiency is improved.

Further, the work vehicle according to the related inventions of the ninth, the second in addition to the effect of any one of the invention related eighth invention, an elevating link mechanism (3), at a position lower than the raised position Since the drive unit (110) operates to stop the elevating cylinder (25), the elevating link mechanism (3) is moved upward from the operation of the drive unit (110) until the elevating cylinder (25) stops. It is possible to rotate and to prevent an unnecessary load from being applied to the elevating link mechanism (3) and the elevating cylinder (25).

FIG. 1 is a side view of a seedling transplanting machine according to the present embodiment. FIG. 2 is a plan view of the seedling transplanting machine according to the present embodiment. FIG. 3 is an explanatory view showing a control mechanism of the seedling planting part of the seedling transplanting machine according to the present embodiment. FIG. 4 is an explanatory view 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 showing an example of operation control of the elevation link mechanism according to the operation of the elevation operation switch. FIG. 7 is a flowchart showing an example of operation control of the elevation link mechanism according to the operation of the elevation operation switch. FIG. 8 is a flow chart showing an example of operation control of the lifting link mechanism according to the operation of the work on / off switch. FIG. 9 is a flow chart showing an example of operation control of the lifting link mechanism according to the operation of the continuous lowering operation switch. FIG. 10 is an explanatory view showing the arrangement of retaining bolts of the differential lock arm in the transmission case. FIG. 11 is an explanatory view of a planting clutch. FIG. 12 is an explanatory view showing a planting clutch pin. FIG. 13 is an explanatory view showing the arrangement of the battery. FIG. 14A is an explanatory view showing an example of a hydraulic circuit of a seedling transplanting machine. FIG. 14B is an explanatory view showing a comparative example of the hydraulic circuit of the seedling transplanting machine. FIG. 15 is an explanatory view showing an example of a hydraulic circuit of a seedling transplanting machine 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 defining the front, rear, left, and right directions, the traveling direction of the traveling vehicle is viewed from the control seat as a reference. Moreover, this invention is not limited by embodiment, It can variously deform and implement in the range which does not deviate from the main point of this invention. Furthermore, constituent elements in the following embodiments include those that can be easily replaced by persons skilled in the art or those that are substantially the same, that is, the so-called equivalent ranges.

  In the present embodiment, the work vehicle will be described as a riding type seedling transplanter provided with the seedling planting unit 4 as a ground work device. FIG. 1 is a side view of a seedling transplanting machine, and FIG. 2 is a plan view of a traveling vehicle body. Although the seedling transplanting machine which concerns on embodiment is a structure of eight row planting, it does not matter as a seedling transplanting machine of the number of planting streaks different from this composition. Moreover, when referring to the whole seedling transplanting machine, it may be described as an aircraft.

  As shown in FIG. 1 and FIG. 2, the seedling transplanting machine according to the present embodiment is provided with a seedling planting unit 4 for raising and lowering seedlings in the field via a lift link mechanism 3 on the rear side of the traveling vehicle body 2. ing. Then, the main body portion of the fertilizer application device 5 is disposed on the rear upper side of the traveling vehicle body 2. In addition, when a work vehicle is not a seedling transplanting machine, there exist some which are equipped with a sowing apparatus etc. which supply a seed as a working apparatus.

  The traveling vehicle body 2 is a four-wheel drive vehicle provided with left and right front wheels 10 and 10 and rear wheels 11 and 11 which are drive wheels. A transmission case 13 for transmitting the driving force to the seedling planting part 4 etc. and a hydraulic pressure for outputting the driving force supplied from the engine 30 to the transmission case 13 on the front side of the main frame 15 constituting the vehicle body frame of the traveling vehicle body 2 And a continuously variable transmission 14 of the formula. The continuously variable transmission 14 is a hydrostatic continuously variable transmission called so-called HST (Hydro Static Transmission).

  A front wheel final case 10 a is provided on the left and right sides of the transmission case 13. Then, the front wheels 10 are attached to the left and right front axles 10b which respectively project outward from the front wheel support portion capable of changing the steering direction of the left and right front wheel final cases 10a. In addition, rear wheel gear cases 11a are attached to the left and right sides of a rear frame 22 (see FIG. 2) provided in the lateral direction of the vehicle on the rear side of the main frame 15, and project outward from the rear wheel gear cases 11a. The rear wheels 11 are respectively attached to the left and right rear axles 11b.

  Further, on the upper part of the rear frame 22, left and right link support frames 23, 23 for supporting the elevating link mechanism 3 are protruded upward. 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, and between the left and right of the left and right lower link arms 24, 24 by hydraulic pressure. A lift cylinder 25 is provided which operates. Then, by providing the upper link arm 26 above the lift cylinder 25, the lift link mechanism 3 which is a parallel link mechanism is configured. The other lower end of the lower link arms 24 and 24, the lifting cylinder 25 and the upper link arm 26 each having one end connected to the traveling vehicle body 2 is attached to the front of the seedling planting section 4.

  Further, as illustrated, the 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 transmission case 13 is shifted by the transmission in the transmission case 13, and then separated into the traveling power and the externally extracted power and taken out.

  The externally extracted power which is separated and taken out from the rotational power transmitted to the transmission case 13 is transmitted to a planting clutch case 27 provided at the rear of the traveling vehicle body 2. Then, the planting clutch case 27 is transmitted to the seedling planting unit 4 by the planting transmission shaft 67.

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

  Although not shown, a side clutch mechanism is provided on the transmission direction upper side with respect to the left and right drive shafts 42, 42 for transmitting and receiving the transmission to the left and right drive shafts 42, 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 on the lower front side of steering seat 41 and on one side.

  Of the left and right side clutch pedals 43a, 43a, if the side clutch mechanism 43a on the inner side of the turn is depressed to turn off the side clutch mechanism and then the steering wheel 35 is operated for turning, the drive rotation of the rear wheel 11 inside the turn is It can be completely shut off. Therefore, the turning radius can be made smaller than turning by the operation of the handle 35 alone, and the work start position of the work bar suitable for the field can be appropriately selected, and the work accuracy is improved.

  In this manner, the transmission to the inner rear wheel 11 can be stopped at the time of turning, and the turning radius can be reduced, and the working position before turning and the working position after turning can be prevented from being separated. This eliminates the need to re-adjust the work start position, thus improving work efficiency and work accuracy. In the present embodiment, when the steering wheel 35 is turned to turn the traveling vehicle body 2 to turn, the side clutch mechanism located inside the turn is turned off to stop the transmission to the rear wheel 11 inside the turn. It is possible to

  At the upper front of the traveling vehicle body 2, a bonnet 39 provided with a control panel 38 at the upper portion for operating each part is provided. 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).

  In addition, the bonnet 39 includes a steering wheel 35 for steering the machine body, a shift control lever 36 for operating the continuously variable transmission 14 and the seedling planting unit 4, and an auxiliary shift switching device (not shown) for switching the traveling transmission of the traveling vehicle 2. An auxiliary shift control lever 37 or the like to be operated is provided. In the present embodiment, the speed change operation lever 36 functions as an operation tool including an elevation operation member that operates the elevation cylinder 25 and a work on / off member that switches the seedling planting unit 4 between the operation state and the non-operation state.

  In addition, a front cover 40 which can be opened and closed is provided on the front side of the bonnet 39, and inside the front cover 40, the fuel tank, battery, and steering wheel 35 steer the left and right front wheels 10, 10 and 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 part and the side part of the engine 30 is provided at a position rearward of the bonnet 39 and above the engine 30, and a control seat 41 on which an operator is seated above the engine cover 30a. Is provided.

  Furthermore, the fertilization device 5 is mounted on the rear side of the main frame 15 on the rear side of the steering seat 41. The driving force of the fertilization device 5 is transmitted by a fertilization transmission mechanism (not shown) provided so as to face the fertilization device 5 from the left and right one side of the left and right rear wheel gear cases 11a.

  A substantially horizontal floor step 33 is formed on the left and right sides of the lower part of the engine cover 30a and the bonnet 39. As shown in FIG. 2, the floor step 33 is partially in the form of a lattice, and the mud attached to the shoes of the worker who walks on the floor step 33 falls into the field. Moreover, as shown in FIG. 2, the seedling transplanting machine which concerns on this embodiment arrange | positions the left and right extension steps 34, 34 on the left and right sides of the floor step 33, respectively.

  Further, a rear step 330 (see FIG. 2) is connected behind the floor step 33, and an extension rear step 340 is extended behind the extension step 34. The surfaces of the rear step 330 and the extension step 34 are preferably subjected to anti-slip processing in which a plurality of projection patterns are formed, for example, so that the foot is not slippery when working.

  In addition, as shown in the figure, on the front side of the traveling vehicle body 2 and on both the left and right sides, spare seedling frames 50 are provided to arrange a plurality of spare seedling placing stands 52 on the seedling frame support column 51 at intervals in the vertical direction. Working 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 the seedlings to be planted in the field is attached to a rear end portion of the lifting link mechanism 3 together with a sliding mechanism (not shown) sliding in the lateral direction. The seedling tank 53 has a long seedling partition fence 54 arranged in the vertical direction at predetermined intervals in the left-right direction, and a seedling planting device for scraping the loaded seedlings under the seedling tank 53 and planting it in the field 55 are arranged.

  The seedling planting device 55 is the same number as the number of planting operation bars divided by the seedling partition fence 54, that is, eight in the present application, and the planting transmission case 56 is spaced below the seedling tank 53. Four planting rotarys 57, 57 are provided, each of which is arranged in four rows and rotated to both the left and right sides of the planting transmission case 56 to take seedlings and plant them in the field.

  Moreover, the fertilization apparatus 5 divides the fertilization hopper 70 which stores a fertilizer into the same number as the number of operation bars of the seedling planting part 4 (eight lines in this embodiment). In addition, since the fertilization hopper 70 for eight lines is long in the left-right direction and the convenience of the injection | pouring of a fertilizer and attachment or detachment falls, it is good also as a structure which put two inside which divided the inside into four lines.

  At the lower part of the fertilization hopper 70, a feeding device 71 for feeding a set amount of fertilizer is provided for each row, and a ventilation duct 72 through which a conveying wind for moving the fertilizer passes below the feeding device 71 in the lateral direction of the machine Provided. And the fertilization hose 73 which guides a fertilizer in the vicinity of the seedling planting position of the seedling planting part 4 in the downward position of each delivery apparatus 71 is provided. Further, a blower 74 is provided at one end of the ventilation duct 72 on the side of the machine body, which is operated by the blower electric motor 76 to generate a carrier air.

  In addition, as shown in FIGS. 1 and 2, below the seedling planting unit 4, a center float 62C that slides on the heel scene and two side floats 62L and 62R turn around the shaft. It is freely provided. The center float 62C and the left and right side floats 62L and 62R may be collectively referred to as the float 62 in some cases.

  Further, on the lower side of the seedling planting unit 4 and on the front side of the float 62 with respect to the float 62, there is provided a ground leveling rotor 63 (FIG. 1) for leveling the unevenness of the straw scene. The driving force of the leveling rotor 63 can be obtained from the rear wheel gear case 11a on the other side via the rotor transmission shaft 63a.

  Furthermore, as shown in FIG. 1, on the left and right sides of the seedling planting part 4, either the left or the right is in contact with the dredging scene, and a wire drawing marker is formed to serve as a guide for traveling on the next work strip. 65, 65 are provided respectively. When left and right sides of the left and right draw markers 65 and 65 contact each other, the left and right sides are separated upward, and when raising the seedling planting part 4 at the time of turning, both left and right are separated at the same time. When the part 4 descends, the left and right sides are separated upward, and the left and right other sides are grounded.

  Further, as shown in FIG. 1 and FIG. 2, a center mascot 66 which is long in the vertical direction is provided at the left and right center of the traveling vehicle body 2 and in front of the bonnet 39. By aligning the center mascot 66 with the groove formed by the left and right line draw markers 65, 65, it becomes possible to run according to the work position of the last work bar, improving work accuracy and generating non-work position Prevention of

  In addition, depending on the soil quality of the field, the guide lines formed by the left and right draw markers 65 may be buried immediately, and the straight line may disappear. At this time, it is preferable to use the left and right side markers 19 provided on the front side of the machine than the left and right draw markers 65, 65. That is, by moving the left and right side markers 19 in the outward direction of the machine and positioning the side markers 19 above the planted seedlings, it becomes possible to perform the planting work in accordance with the planting of the seedlings of the previous work bar. .

  In the above configuration, the characteristic configuration of the seedling transplanting machine according to the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is an explanatory view showing a control mechanism of the seedling planting unit 4 of the seedling transplanting machine according to the present embodiment, and FIG. 4 is an explanatory view showing the switching unit 200. As shown in FIG.

  The seedling transplanting machine which concerns on this embodiment is provided with the working device control mechanism 300 which performs operation control of the seedling planting part 4, as shown in FIG.

  The work device control mechanism 300 switches the operation of the controller 100 as a control unit for controlling the raising and lowering 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 raising and lowering cylinder 25 And a switching valve 130. The work device control mechanism 300 further includes a switching arm 120 which is rotated by the electric motor 110 to move the spool 131, and a rotation sensor 140 which detects the amount of rotation of the switching arm 120.

  The electric motor 110 functions as a drive unit that operates in response to the operation of the elevation operation switch 361 which is an elevation operation member provided on the shift operation lever 36 or the operation on / off switch 362 which is an operation on / off member. Further, as shown in the figure, the gear shift operation lever 36 according to the present embodiment is also provided with a continuous descent operation switch 363, which is a continuous descent operation member for causing the seedling planting portion 4 to descend continuously.

  The controller 100 is electrically connected to the electric motor 110, the rotation sensor 140, and the link rotation sensor 31 for detecting the rotation position of the elevation link mechanism 3, and a solenoid for operating the planting clutch 27 described above. And an actuator 271 such as a motor. The link rotation sensor 31 may be any sensor as long as it can detect the rotation position of the lifting link mechanism 3. For example, a potentiometer can be suitably used.

  Then, based on the operation of the elevation operation switch 361 or the work ON / OFF switch 362 and the detection value of the rotation sensor 140 at the time of operation of the elevation operation switch 361 or the operation ON / OFF switch 362, the seedling planting is performed. Control the raising and lowering operation and the work operation of the unit 4.

  That is, the controller 100 according to the present embodiment stops the electric motor 110 when the value detected by the rotation sensor 140 becomes a predetermined value. As described above, when the value detected by the rotation sensor 140 becomes a predetermined value, the controller 100 stops the electric motor 110, so that it is possible to perform a more reliable operation despite the 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 to switch the operation of the elevating cylinder 25. With this configuration, the lifting and lowering operation of the lifting and lowering link mechanism 3 can be switched to the lifting mode, the lowering mode, and the lifting and lowering stop mode. In the following, the elevation stop mode may be referred to as a neutral mode.

  The seedling transplanting machine according to the present embodiment includes the above-mentioned switching arm 120, electric motor 110, rotation sensor 140, and switching valve 130 on a common mounting plate 210 detachably attached to the main frame 15 of the traveling vehicle body 2. It arrange | positions and the switching unit 200 is comprised.

  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 mounting plate 210 is provided with a plurality of mounting holes 215 as holes, and can be mounted to the main frame 15 by inserting mounting members such as bolts through the mounting 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 collectively arranged on the mounting plate 210, they can be assembled together with the mounting plate 210 and removed from the traveling vehicle body 2. Therefore, when the maintenance operation of the switching unit 200 is performed, since the attachment / detachment operation of the extra parts and the like becomes unnecessary, the maintenance performance is improved.

  The switching arm 120 includes a pivoting arm 122 pivoted by the electric motor 110, and an interlocking arm 121 that pivots in conjunction with the pivoting arm 122 to switch the switching valve 130. That is, the interlocking arm 121 is in direct contact with the spool 131 of the switching valve 130, and the interlocking arm 121 and the switching valve 130 are disposed outside the mounting plate 210, while the electric motor 110 and the pivoting arm The rotation sensor 140 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 or damage due to the adhesion of water and mud.

  As described above, in the present embodiment, the electric motor 110 is operated by operating the elevating operation switch 361 or the work on / off switch 362 provided on the gear shift operation lever 36, and the switching valve 130 is switched by the switching arm 120. . That is, the interlocking arm 121 of the switching arm 120 pushes the spool 131 of the switching valve 130 by the operation of the electric motor 110, and as a result, the raising and lowering operation of the seedling planting unit 4 is the raising mode, lowering mode, and lifting 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 lift arm 250, and referring to FIG. 5 (a), the operation of the switching arm 120 (interlocking arm 121) and The operation of the interlocking switching valve 130 will be described below.

  As shown in FIG. 5A, the switching arm 120 is rotated around the connecting shaft 111a by the drive of the electric motor 110, and takes positions A to D for regulating the advancing and retracting positions of the spool 131 of the switching valve 130, respectively. be able to. Here, the A position is a position at which the switching valve 130 is switched to the rising mode (a mode in which the lifting link mechanism 3 is raised). The B position is a position at which the switching valve 130 is switched to the elevation stop mode (mode for stopping the elevation link mechanism 3). The C position is a position at which the switching valve 130 is switched to the lowering mode (mode for lowering the lifting link mechanism 3).

  On the other hand, the D position is a position indicating work "on", that is, a position at which the planting clutch 27 of the seedling planting unit 4 is switched to "on", separated from the spool 131 of the switching valve 130 It is a 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 can not be pressed.

  Thus, by switching the switching valve 130, the working height of the seedling planting part 4 and the turning on and off of the operation are mechanically switched. Therefore, although the work device control mechanism 300 according to the present embodiment has an inexpensive configuration, the maintainability can be improved. Moreover, since the operation member of the seedling planting part 4 is intensively arranged on the speed change operation lever 36, there is no need to operate a plurality of operation levers and the like, and the operability is also improved.

  Further, 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. Then, as shown in FIGS. 1 and 2, the switching unit 200 provided with the mounting plate 210 is disposed outside the steering seat 41 provided at the left and right center of the traveling vehicle body 2, such as bolts and screws. The mounting member of the above can be inserted into the hole from the outside of the traveling vehicle body 2.

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

  In addition, while the seedling planting operation is being performed, the spool 131 is moved to the mounting plate 210 according to the rotation of the float 62 (see FIGS. 1 and 2), and the switching valve 130 is switched to perform seedling planting. An automatic raising and lowering arm 250 is provided for automatically raising and lowering the attachment 4.

  That is, as shown in FIG. 4, the automatic lift 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 biases the switching valve 130 away from the switching valve 130.

  Here, the operation of the automatic lift arm 250 which is independently rotated independently of the switching arm 120 which is rotated by the electric motor 110 will be described with reference to FIG. 5 (b).

  When the seedling planting unit 4 is carrying out a seedling planting operation, if the field becomes shallow, the tip end side of the center float 62C floats and rotates upward. At this time, as shown in FIG. 5B, the connecting wire 270 is pulled, and the automatic lift arm 250 pushes the spool 131 of the switching valve 130 about the pivot shaft 111b (for example, position A in FIG. In order to turn to the side), the elevating link mechanism 3, that is, the seedling planting unit 4 is raised.

  On the other hand, when the depth of the field changes and the tip end side of the center float 62C turns downward to loosen the connection wire 270, the automatic lift arm 250 is a side away from the spool 131 of the switching valve 130 by the spring 260 Rotate to a position between D and D (refer to the position indicated by a dashed dotted line). At this time, the seedling planting part 4 descends until the center float 62C comes into contact with the ground.

  Thus, in the state where the center float 62C is grounded, that is, the connecting wire 270 is not pulled or loosened too much, the automatic lift arm 250 slightly pushes the spool 131 of the switching valve 130. (See the position shown by the solid line). Therefore, the seedling planting part 4 does not go up and down in this state.

  The operation of the automatic lift arm 250 is limited only when the seedling planting clutch 27 is "on" and the spool 131 of the switching valve 130 is in the projecting state. For example, when the switching arm 120 is at the position C or on the side where the spool 131 is pushed in, the automatic lift arm 250 is at a position away from the tip of the spool 131 in this position. Therefore, even if the center float 62C moves up and down, since the automatic lift arm 250 does not contact the spool 131, the seedling planting unit 4 does not automatically move up and down.

Incidentally, the mounting plate 21 0, as shown in FIG. 4, a valve lock lever 135 and the float sensitivity adjusting lever 280 are arranged side by side in the thickness direction of the mounting plate 210.

  The valve lock lever 135 is a lever capable of switching the switching valve 130 to the locked state, and the float sensitivity adjusting lever 280 changes the pulling amount by the connecting wire 270 for rotating the automatic lift arm 250, thereby switching the switching valve 130. Is a lever that adjusts the amount of rotation of the center float 62C that brings the lever into the operating state. In the present embodiment, the upper edge portion 220 of the mounting plate 210 is formed with a recess for lever locking (not shown) at a predetermined interval, and the float sensitivity adjustment lever 280 is locked in the predetermined recess to form a center float. The amount of rotation of the 62C is adjustable.

  As described above, since the members are centrally arranged by providing the float sensitivity adjustment lever 280 and the valve lever 135 on the mounting plate 210, it is possible to reduce the number of mounting parts and the like, and the parts mounting operation can be streamlined and cost reduced. Can be In addition, since the float sensitivity adjustment lever 280 and the valve lock lever 135 can be provided near the control seat 41, the operator can change the automatic lift condition of the lift link mechanism 3 without moving from the control seat 41 or Since the switching valve 130 can be switched to the locked state, the working efficiency is improved.

  Here, operation control of the seedling planting part 4 by the controller 100 is demonstrated, referring FIGS. 6-9. 6 and 7 are flowcharts showing an example of operation control of the elevating link mechanism 3 according to the operation of the elevating operation switch 361, and FIG. 8 is operation control of the elevating 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 flow chart showing an example of operation control of the lifting link mechanism 3 in accordance with 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 is lifted (step S100), the value detected by the rotation sensor 140 is regarded as the lifting stop (neutral) mode or the lowering mode. It is determined whether or not it is set (step S110).

  When the detection value of the rotation sensor 140 can be regarded as the elevation stop mode or the lowering mode (step S110: Yes), the controller 100 operates the electric motor 110 to rotate the switching arm 120 to switch the switching valve 130 , Raise and lower the link mechanism 3 (step S120).

  On the other hand, when the detection value of the rotation sensor 140 can not be regarded as the elevating stop mode or the lowering mode (step S110: No), the process proceeds to step S130 and it is determined whether the detection value can be regarded as the elevating mode. judge.

  When the controller 100 regards the detected value as the rising mode (step S130: Yes), the controller 100 moves the process to step S110 without accepting the operation, while the controller 100 does not regard the detected value as the rising mode (step S130: No). ), It is determined whether or not the detected value can be regarded as the planting clutch "ON" (step S140).

  And controller 100 ends this control processing, when a detection value can not be regarded as a planting clutch "on" (Step S140: No). If the detected value is considered to be the planting clutch ON (step S140: Yes), the planting clutch 27 is turned off (step S150), the seedling planting unit 4 is switched to the non-operation state, and then the electric motor 110 is operated to rotate the switching arm 120 to switch the switching valve 130, and the lifting link mechanism 3 is raised (step S120).

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

  The position detected by the rotation sensor 140 is not considered to be in the elevating stop mode or the rising mode, but the descent mode or the position at which the work “on” is shown, ie, the planting clutch 27 of the seedling planting unit 4 is switched on. When the controller 100 can be regarded as a position (step S210: No), the controller 100 does not receive the lowering operation of the elevation operation switch 361. On the other hand, when the detection value of the rotation sensor 140 can be regarded as the elevation stop mode or the elevation mode (step S210: Yes), the controller 100 operates the electric motor 110 to rotate the switching arm 120 to switch the switching valve 130. Switching is performed, and the lifting link mechanism 3 is lowered (step S220).

  As described above, according to the work device control mechanism 300 according to the present embodiment, when the lift operation switch 361 is moved up, the controller 100 detects the rotation sensor 140 and the seedling planting unit 4 performs the operation. In the case of a value that can be regarded as medium, the seedling planting unit 4 is put in the non-operation state, and the electric motor 110 is operated to turn the switching arm 120 so that the lifting link mechanism 3 is in the rising mode. 130 can be switched.

  Therefore, the seedling planting part 4 does not operate | move in the position away from the dredging scene, for example, it is not consumed needlessly at the time of planting.

  Next, operation control of 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 is operated (step S310), the controller 100 determines that the value detected by the rotation sensor 140 is the elevating stop (neutral) mode or the elevating mode. It is determined whether or not it is made (step S320).

  When the detection value of the rotation sensor 140 can be regarded as the elevation 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 And lowering the lifting link mechanism 3 (step S330).

  On the other hand, when the detection value of the rotation sensor 140 can not be regarded as the elevating stop mode or the upper mode (step S320: No), the process proceeds to step S340 to determine whether the detection value can be regarded as the lowering mode. judge.

  Then, when it is determined that the detected value can be regarded as the descent mode (step s340: Yes), the controller 100 operates the electric motor 110 to rotate the switching arm 120 to the position of work “on”, and planting The seedling planting unit 4 is put into a working state as a clutch "on" (step S350), and then this control processing is ended.

  On the other hand, when it is determined in step S340 that the detected value can not be regarded as the descent mode (step S340: No), the controller 100 determines whether or not the detected value is regarded as the planting clutch "on". If the detected value is not regarded as the planting clutch "ON" (step S360: No), the control process is ended.

  If it is determined in step S360 that the detected value can be regarded as the 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 to lower the lifting link mechanism 3 (step S330), and then the control process is finished.

  As described above, according to the work device control mechanism 300 according to the present embodiment, when the work on / off switch 362 is operated, the controller 100 detects the value detected by the rotation sensor 140 and the lift link mechanism 3 moves up. When the value can be regarded as the elevating stop (neutral) mode, the electric motor 110 is operated to switch the switching valve 130 so that the elevating link mechanism 3 is in the lowering mode. Also, when the work on / off switch 362 is operated, if the detection value of the rotation sensor 140 is a value that makes it possible for the lifting link mechanism 3 to be regarded as the lowering mode, the electric motor 110 is operated to turn the switching arm 120. The seedling planting unit 4 is moved to lower the working position to the working position, and the seedling planting unit 4 is put in the working state. Furthermore, when the work on / off switch 362 is operated, if the detection value of the rotation sensor 140 is a value such that the seedling planting unit 4 can be regarded as being in operation, the electric motor 110 is operated to switch the switching arm 120 The switch valve 130 is switched so that the lifting link mechanism 3 is in the lowering mode, and the seedling planting unit 4 is put in a non-working state.

  Therefore, since it can prevent that the seedling planting part 4 will be in a working state during descent | falling of the raising / lowering link mechanism 3, it can prevent that the seedling planting part 4 operate | moves in the position away from the dredging scene. At the time of work, it is prevented that the seedling is consumed needlessly. Since one operation ON / OFF switch 362 can perform the lowering operation to the operation height for the seedling planting unit 4 and the entering / closing operation of the operation, 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 switches 363 are provided close to each other to the speed change operation lever 36 (see FIGS. 1 to 3) together with the above-described elevation operation switch 361 and the work on / off switch 362.

  As shown in FIG. 9, when it is detected that the continuous lowering operation switch 363 is operated (step S410), the controller 100 assumes that the value detected by the rotation sensor 140 is the elevating stop (neutral) mode or the elevating mode. It is determined whether or not it is set (step S420).

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

  If it is determined that the operation of the continuous lowering operation switch 363 continues (step S430: Yes), the controller 100 shifts the process to step S440, operates the electric motor 110, pivots the switching arm 120, and switches the switching valve 130. To lower the lifting link mechanism 3 (step S440), and then the present control processing ends.

  In step S420, when the value detected by the rotation sensor 140 can not be regarded as the elevation stop (neutral) mode or the elevation mode (step S420: No), or in step S430, the operation of the continuous lowering operation switch 363 is When it is determined that the process is not continued (step S430: No), the controller 100 shifts the process to step S450.

In step S450, the controller 100 determines whether the operation of the continuous lowering operation switch 363 has been interrupted. While waiting until the operation is interrupted (step S450:
No), when it is determined that the operation has been interrupted (step S450: Yes), the controller 100 operates the electric motor 110 to rotate the switching arm 120 to a position where it can be regarded as the elevating stop (neutral) mode. The descent of the mechanism 3 is stopped (step S460), and then the control process ends.

  As described above, according to the present embodiment, since the descent position of the seedling planting unit 4 can be finely adjusted, the accuracy and efficiency of the planting work of the seedling are improved.

  By the way, in the seedling transplanting machine according to the present embodiment, the pivoting position of the lifting and lowering link mechanism 3 stops the lifting and pivoting of the lifting and lowering link mechanism 3 before the angle at which the lifting and lowering link mechanism 3 is considered to be in the lifting state. I am trying to

  That is, the controller 100 detects a pivoting position of the lifting link mechanism 3 from the angle at which the lifting link mechanism 3 can be considered to be in the rising state, a predetermined angle (for example, 5 ° to 10 °) When a small angle is detected, the switching arm 120 is rotated by the electric motor 110 to an angle at which the elevating operation of the elevating link mechanism 3 becomes the elevating stop (neutral) mode, and the upward pivoting of the elevating link mechanism 3 is stopped. I have to.

  As described above, in the seedling transplanting machine according to the present embodiment, the elevation link mechanism 3 can stop the elevation cylinder 25 by operating the electric motor 110 at a position lower than the elevation position. Therefore, since the lift link mechanism 3 can be rotated upward between the operation of the electric motor 110 and the stop of the lift cylinder 25, an unnecessary load is applied to the lift link mechanism 3 and the lift cylinder 25. Can be prevented.

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

  In such a configuration, conventionally, the retaining bolt 420 of the differential lock arm 460 is provided on the case center side of the oil seal 430, but in the present embodiment, the retaining bolt 420 is provided outside the oil seal 430. .

  That is, in the past, every time the transmission case 13 was disassembled, it was necessary to replace the retaining bolt with a seal with a new one in order to prevent oil leakage, but with the configuration as shown in FIG. , It becomes possible to reuse the retaining bolt 420 and it is not necessary to replace it. Moreover, since the retaining bolt 420 is disposed outside the oil seal 430, there is no need to provide a sealing function, and the cost of parts can be reduced.

  FIG. 11 is an explanatory view of the planting clutch 27, and FIG. 12 is an explanatory view showing a planting clutch pin. As shown in FIG. 11, a planting transmission shaft 510 is provided adjacent to the transmission case 13 to transmit the externally extracted power input from the transmission case 13 to the seedling planting unit 4 via the planting clutch 27. ing.

  The planting clutch 27 includes a planting clutch pin 520, a clutch claw 530 and a spring 540. The clutch claw 530 is attached to the outer periphery of the planting output shaft 550, and the spring 540 biases the planting output shaft 550 to the opposite side to the planting transmission shaft 510. Then, when the planting clutch pin 520 is pressed, the clutch claw 530 falls into the groove formed on the outer periphery of the clutch claw 530, whereby the planting output shaft 550 is slid and the clutch is disengaged. In addition, 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 θ2 of the chamfered portion formed at the tip of the planting clutch pin 520 is 45 °. Therefore, for example, when the planting clutch 27 is disengaged at low speed rotation, the planting clutch pin 520 may not easily fall into the groove at the clutch stop position. In addition, at the time of high speed rotation, the planting clutch pin 520 is repelled and it becomes difficult to fall into the groove again, and there is a problem that the clutch becomes difficult to disengage.

  So, in this embodiment, as shown to Fig.12 (a), taper angle (theta) 1 of the chamfer formed in the front-end | tip of the planting clutch pin 520 is 30 degrees. Thus, by changing the taper angle, the planting clutch pin 520 can be easily dropped into the groove even at low speeds and high speeds, and the operation of the planting clutch 27 is made more stable.

  Next, the arrangement of the battery 600 will be described. FIG. 13 is an explanatory view showing the arrangement of the battery 600. As shown in FIG. In the seedling transplanting machine, the battery stay 610 connected to the battery receiver 620 on which the battery 600 is placed is mounted in the middle of the seedling frame support 51 that supports the spare seedling stand 52 provided on the front side of the traveling vehicle body 2.

  Conventionally, as shown in FIG. 13 (b), since the battery stay 610 is provided close to the support bar 190 of the side marker 19, the arrangement structure including the battery 600 provides a view for the side marker 19 from the control seat 41. Was a factor to prevent

  Therefore, in the present embodiment, as shown in FIG. 13A, the battery stay 610 is attached above the supporting rod 190 of the side marker 19 by a predetermined distance h, and the battery 600 and the side marker 19 are mounted. 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 transplanting machine will be described. FIG. 14A is an explanatory view showing an example of a hydraulic circuit of a seedling transplanting machine, and FIG. 14B is an explanatory view showing a comparative example of the hydraulic circuit of the seedling transplanting machine.

  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, and the oil pump 740 has a power steering mechanism 700, an elevating cylinder 25, and a stepless transmission. A device (HST) 14 is connected.

  Conventionally, as shown in FIG. 14B, the diverting valve 710 is provided immediately downstream of the oil pump 740, and the diverting valve 710 diverts the flow path to the power steering mechanism 700 side and the continuously variable transmission 14 . Therefore, when the situation where a large amount of oil is supplied to the continuously variable transmission 14 and the elevating cylinder 25 continues, the flow rate of oil supplied to the power steering mechanism 700 tends to be smaller than the necessary flow rate. If so, 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 diverting valve 710 is disposed immediately downstream of the power steering mechanism 700. That is, first, oil is supplied to the power steering mechanism 700, and thereafter, it is branched by the flow dividing valve 710 to the switching valve 130 side and the continuously variable transmission 14 side.

  With this configuration, the required flow rate of the power steering mechanism 700 can be reliably ensured, and the steering wheel 35 can be operated smoothly at all times.

(Other embodiments)
Here, a hydraulic circuit in a seedling transplanting machine according to another embodiment will be described. FIG. 15 is an explanatory view showing an example of a hydraulic circuit of a seedling transplanting machine 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. Further, the hydraulic cylinder 660 corresponds to the elevating cylinder 25 in the embodiment described above. 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 large load is applied to the hydraulic cylinder 660 that raises and lowers the ground work apparatus (for example, the seedling planting unit 4) which is a heavy load, there is a possibility that oil may leak inside the cylinder. If an oil leak occurs, the ground work device naturally descends even in the elevated position. In that case, if the ground work device is a seedling planting device, the seedling planting device will be lowered further than the specified position at the start of planting, so that the planting depth of the seedling fluctuates. It will

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

  An adapter (not shown) is provided at a port of the control valve 640, and an orifice is formed inside the adapter. In the needle valve 670 according to the present embodiment, the maximum opening area of the flow passage is set to be equivalent to the cross-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.

  Also, the housing of the needle valve 640 is the same as the housing material of the other valves. As described above, since the mold cost and the like become unnecessary by sharing the material, the cost can be reduced.

  As described above, the seedling planter, which is a working 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 of the traveling vehicle body 2 Lifting link mechanism 3 for raising and lowering seedling planting unit 4 which is a device, lifting cylinder 25 for raising and lowering lifting link mechanism 3 and lifting operation switch for operating lifting cylinder 25 as an operating tool for operating seedling planting unit 4 361 and a shift control lever 36 having a work on / off switch 362 for switching the seedling planting unit 4 between the working state and the non-working state, and seedling planting according to the operation of the elevation operation switch 361 or the work on / off switch 362 And a work device control mechanism 300 for controlling the elevation and movement of the unit 4.

  Then, the work device control mechanism 300 rotates the switching valve 130 which switches the operation direction of the elevating cylinder 25 by the movement of the spool 131, the switching arm 120 which rotates and moves 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 for detecting the amount of rotation of the switching arm 120 rotated by the electric motor 110, and the electric motor according to the operation of the elevation operation switch 361 or the work on / off switch 362 The controller 100 is a control unit that controls the operation of the motor 110 and stops the operation of the electric motor 110 when at least the amount of rotation detected by the rotation sensor 140 becomes 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 a solenoid valve, and can improve maintainability while having an inexpensive configuration. Further, for example, there is no need to operate a plurality of operating levers, etc., and the operability is also improved.

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

2 traveling vehicle body 3 raising and lowering link mechanism 4 seedling planting section (opposing work device)
15 Main frame 25 Lifting cylinder 36 Shift control lever (operating tool)
100 controller (control unit)
110 Electric motor (drive unit)
120 switching arm 121 interlocking arm 122 pivoting arm 130 switching valve 131 spool 135 valve lever 140 pivoting sensor 200 switching unit 210 mounting plate 215 hole 250 automatic lift arm 260 spring 270 link wire 280 float sensitivity adjustment lever 361 lift operation switch (Lifting operation member)
362 Work on / off switch (work on / off member)
363 Continuous descent operation switch (continuous descent operation member)

Claims (3)

A lifting link mechanism (3) for lifting and lowering the working device (4), a lifting cylinder (25) for lifting and lowering the lifting link mechanism (3), and a switching valve (130) for extending and lowering the lifting cylinder (25) And an automatic lift arm (250) capable of switching the switch valve (130) according to the rotation of the lift operating member (361) for operating the switch valve (130) and the float (62) grounded to the scene. In the work vehicle provided with
The switching valve (130), a drive member (110) that operates in conjunction with the operation of the elevation operation member (361), and a switching arm that operates the switching valve (130) by the operation of the drive member (110) (120), a rotation sensor (140) for detecting the rotation amount of the switching arm (120), a float sensitivity adjusting lever (280) for adjusting the rotation amount of the float (62), and the switching valve (130) Mounting the valve lock lever (135) on the mounting plate (210) to form the switching unit (200), and the mounting plate (210) is detachably mounted on the traveling vehicle body (2). ,
The switching arm (120) is a pivoting arm (122) which is pivoted by the drive member (110), and an interlocking arm (121) which switches the switching valve (130) in conjunction with the pivoting arm (122). And),
The drive member (110), the rotation sensor (140) and the rotation arm (122) are provided inside the body of the mounting plate (210), and the float sensitivity adjustment lever (280) and the valve A work vehicle characterized in that a lock lever (135) is juxtaposed in a thickness direction of the mounting plate (210). A work on / off member (362) for switching the working device (4) between the working state and the non-working state;
Wherein based on a value detected by the rotation sensor (140) during operation of the operating and the work Nyusetsu member of the working Nyusetsu member (362) (362), the lifting operation and work before Symbol Operation industry equipment (4) The work vehicle according to claim 1, further comprising: a control unit (100) configured to control an operation. The control unit (100)
When the value detected by the rotation sensor (140) can be regarded as the elevation link mechanism (3) in the rising mode or the elevation stopping mode when the work on / off member (362) is operated, Operating the driving member (110) to switch the switching valve (130) such that the lifting link mechanism (3) is in the lowering mode;
When the value detected by the rotation sensor (140) is a value that makes it possible for the lifting link mechanism (3) to be considered to be in the lowering mode when the work on / off member (362) is operated, the driving member (110) ) To rotate the switching arm (120) to lower the working device (4) to the working position, and put the working device (4) into working state, and further, the work on / off member ( 362), when the detection value of the rotation sensor (140) is a value that makes the work device (4) think that the work device (4) is working, the drive member (110) is operated to switch the switching The arm (120) is turned to switch the switching valve (130) so that the elevating link mechanism (3) is in the lowering mode, and the working device (4) is put in a non-working state. Work according to claim 2 Both.

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