JP2017176095A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle excellent in durability in which a second work part attached to the rear part of a first work part is separated from the first work part backward by easy work without requiring a large space in the rear.SOLUTION: A rice transplanter 1 includes a travelling machine body 2, a planting part 20 connected to the rear part of the travelling machine body 2, and a first spraying device 85 and a second spraying device 101 attached to the planting part 20. The first spraying device 85 and the second spraying device 101 are attached to the rear part of the planting part 20 so as to move in a longitudinal direction through a parallel linkage mechanism 126 with connection shafts 161 and 162 extending in a vertical direction as spindles.SELECTED DRAWING: Figure 18

Description

  The present invention relates to a work vehicle, and more particularly, to a work vehicle including a second work unit attached to a first work unit coupled to a rear part of a traveling machine body.

  In farm work, a work vehicle such as a rice transplanter that connects various work machines to a traveling machine body and performs a desired work while traveling is used. The rice transplanter includes a planting part connected to the rear part of the traveling machine body, and is configured to plant seedlings in the paddy field while traveling. The planting unit includes a seedling mounting table on which a seedling mat is placed, a planting device that scrapes a predetermined amount of seedlings from the seedling mat, and plants the seedling on a farm field. Then, a predetermined amount of seedlings are scraped off from the seedling mat by the planting claws of the planting device, and the seedlings are planted in the field by being inserted into the field.

  Some rice transplanters are known to have a spraying device for spraying a drug on a field and a spraying device for spraying a drug on a seedling mat placed on a seedling stand. May be placed behind the table. And various structures which attach such a spraying device to a planting part are examined.

  For example, in Patent Document 1, a feed case for power supply, a planting case equipped with a seedling planting mechanism for cutting and planting seedlings from a seedling table, and a state facing the seedling mounting surface of the seedling table are arranged. A fertilizer applicator and a fertilizer applicator that is designed to transmit power from the feed case to the planting case and the fertilizer applicator. There has been disclosed a rice transplanter with a fertilizer application device in which the device and the planting case are integrated and movable between an installation position corresponding to a working state and a standby position away from the seedling stand.

  Further, Patent Document 2 discloses a fertilizer application body composed of a storage hopper and a feeding device connected to a planting mechanism of a seedling planting device via a linkage rod so as to interlock with a crank. With fertilizer application that is connected to the fixed part of the seedling planting device so that the position can be changed between the fertilization work position on the side facing the surface and the standby position farther from the lower part of the seedling placement surface than this fertilization work position It is a rice transplanter, and the fertilizer application body is connected via a parallel quadruple link mechanism having a pair of swing link members that are the same length as the interlocking rod and are always set parallel to the interlocking rod. A rice transplanter with a fertilizer is disclosed, which is connected to a fixed part of the seedling planting device so that it can swing back and forth from the fertilizer application position and the standby position is set to the lower rear side of the seedling placement surface. Yes.

JP 05-268807 A Japanese Patent Laid-Open No. 08-140440

  According to the configuration of Patent Document 1, the planting case can be separated from the seedling table together with the fertilizer, the lower part of the seedling table is also in an open state, and maintenance work at the lower end of the seedling table becomes easy. Has been.

  Here, the rice transplanter in Patent Document 1 has a configuration in which the planting case and the fertilizer application device are integrally rotated rearward with an axis extending in the vertical direction of the right end portion as a support shaft. Therefore, in order to separate the planting case and the fertilizer application device from the seedling mount, a large space is required on the rear side. For example, it is difficult to separate the planting case and the fertilizer application device from the seedling stand under a situation where the space is restricted, such as when the ridge is on the back or in a warehouse. Further, when the planting case and the fertilizer are separated from the seedling stage, the weight of the planting case and the fertilizer is concentrated on one rotating shaft, so the durability is poor and the strength of the rotating shaft is increased. Measures such as are necessary.

  According to the configuration of Patent Document 2, the fertilizer application main body can be swung back while the interlocking rod is connected to the planting mechanism of the seedling planting apparatus and the feeding device of the fertilizer application main body. It is said that the side is greatly opened to make it easy to take out the remaining seedling, and it is not necessary to perform the operation of releasing the connection of the connecting rod.

  Here, the rice transplanter in Patent Document 2 is configured to swing the fertilizer application body backward and downward by a parallel quadruple link mechanism having a shaft extending in the left-right direction as a support shaft. Therefore, when separating the fertilizer application main body from the seedling mount, the operator needs to swing while supporting the fertilizer application main body so that the fertilizer application main body does not move suddenly. Further, when returning the fertilizer application main body to the fertilization work position, the operator needs to swing the fertilizer application main body so as to lift up the fertilizer application main body, which places a great burden on the operator.

  Accordingly, an object of the present invention is to perform an easy operation without requiring a large space on the rear side, and to separate the second working unit attached to the rear part of the first working unit from the first working unit to the rear and to achieve durability. It is to provide a work vehicle with good performance.

In order to solve the above problems, the present invention provides:
Traveling aircraft,
A first working unit coupled to a rear portion of the traveling machine body;
A second working part attached to the first working part;
With
The second working part is attached to the rear part of the first working part so as to be movable in the front-rear direction via a parallel link mechanism having a shaft extending in the vertical direction as a support shaft.

  Furthermore, the parallel link mechanism is provided at a rear portion in any one of the left and right directions of the first working unit.

Furthermore, the first working unit includes a seedling stage on which a seedling mat is placed, a plurality of planting devices for planting seedlings in a field, and a planting frame that supports the seedling mounting table and the planting device. And a planting part comprising:
The second working unit is a spraying device that sprays a medicine on the seedling mat or a field placed on the seedling platform,
An end of the parallel link mechanism on the first working part side is attached to the planting frame.

Further, the planting frame has a main frame extending in the left-right direction, and a plurality of planting transmission cases extending rearward from the main frame and having the planting device disposed at a rear end portion thereof,
An end of the parallel link mechanism on the first working part side is attached to the planting transmission case.

  According to the present invention, the vehicle includes a traveling machine body, a first working unit coupled to a rear portion of the traveling machine body, and a second working unit attached to the first working unit, the second work Since the part is attached to the rear part of the first working part so as to be movable in the front-rear direction via a parallel link mechanism having a shaft extending in the vertical direction as a support shaft, it is easy to work without requiring a large space behind. Thus, the second working part attached to the rear part of the first working part can be separated rearward from the first working part, and a work vehicle having good durability can be provided. And even if it is a small space, the maintenance of the 1st operation part can be performed easily.

  Furthermore, according to the configuration in which the parallel link mechanism is provided at the rear part of either one of the left and right directions of the first working unit, the parallel link mechanism is less likely to become an obstacle when performing maintenance on the first working unit. Easy maintenance. For example, the first working unit can be maintained without moving to the left or right while avoiding the parallel link mechanism.

  Furthermore, the first working unit includes a seedling stage on which a seedling mat is placed, a plurality of planting devices for planting seedlings in a field, and a planting frame that supports the seedling mounting table and the planting device. And the second working unit is a spraying device that sprays the medicine on the seedling mat or the field placed on the seedling platform, and the first of the parallel link mechanism According to the configuration in which the end on the working part side is attached to the planting frame, maintenance of the seedling stage and the planting apparatus can be easily performed.

  Furthermore, the planting frame has a main frame extending in the left-right direction, and a plurality of planting transmission cases extending rearward from the main frame and having the planting device disposed at a rear end portion thereof, The end of the parallel link mechanism on the first working part side can be arranged with a simple structure according to the structure attached to the planting transmission case, and maintenance of the seedling stand and the planting device can be performed. Easy to do.

It is the schematic side view by which the rice transplanter as an example of the working vehicle of embodiment of this invention was shown. It is a schematic plan view of the rice transplanter of FIG. It is a figure for demonstrating the transmission path | route of the motive power to a planting part. It is the schematic rear view by which an example of the seedling mounting stand was shown. FIG. 5A is a schematic side view of the seedling stage of FIG. 4, FIG. 5A is an overall view of the seedling stage, and FIG. 5B is an enlarged view of the vicinity of the support plate. It is the schematic perspective view by which an example of the seedling mat presser was shown. It is the schematic side view by which an example of the state by which the seedling stand was folded was shown. It is the schematic side view by which an example of the state by which the seedling mat presser was rotated upwards was shown. It is the schematic side view by which an example of the state by which the seedling mat presser was rotated below was shown. It is a schematic side view in which an example of the 1st spreading device and the 2nd spreading device was shown. FIG. 11 is a schematic rear view illustrating an example of a spraying unit of the first spraying device in FIG. 10. It is the schematic rear view by which the 2nd spreading | diffusion apparatus of FIG. 10 was shown. It is the schematic side view by which an example of the spreading power transmission mechanism was shown. It is the schematic plan view by which an example of the parallel link mechanism was shown. It is the schematic side view by which an example of the support part of the support frame was shown. It is the schematic side view in which an example of the tightening lock was shown. FIG. 17A is a schematic plan view showing an example of a link rotation lock, FIG. 17A is a state before the rotation of the link arm is restricted, and FIG. 17B is a state after the rotation of the link arm is restricted. is there. It is the schematic plan view by which an example of the state which moved the 1st spreading | diffusion apparatus and the 2nd spreading | diffusion apparatus back was shown. It is the schematic side view by which an example of the state which moved the 1st spreading | diffusion apparatus and the 2nd spreading | diffusion apparatus back was shown.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view showing a rice transplanter 1 as an example of a work vehicle according to an embodiment of the present invention, and FIG. 2 is a schematic plan view of the rice transplanter 1 shown in FIG. In the following, for convenience of explanation, the left side in FIG. 1 is the forward direction, the back side in FIG. 1 that is orthogonal to the forward direction and is horizontal is the right direction, and the near side is the left direction. The upper side in FIG. 1 that is orthogonal to the front direction and is vertical is the upper direction, and the lower side is the lower direction. Moreover, the traveling body 2 of the rice transplanter 1 is mainly shown in FIG. In FIG. 2, a first spraying device 85 to be described later is indicated by a two-dot chain line, and description of a parallel link mechanism 126 to be described later is omitted.

  As shown in FIGS. 1 and 2, the rice transplanter 1 includes a traveling machine body 2 on which an operator gets on, a planting unit 20 as a first working unit connected to a rear portion of the traveling machine body 2, and planting A first spraying device 85, a second spraying device 101, and the like serving as a second working unit attached to the unit 20 are provided. And although mentioned later for details, the 1st spreading device 85 and the 2nd spreading device 101 as the 2nd operation part extend in the up-and-down direction to the rear part of the planting part 20 as the 1st operation part. It is attached to be movable in the front-rear direction via a parallel link mechanism 126 having a shaft as a support shaft.

  In the traveling machine body 2, an engine 4 as a power source is mounted on the front portion of the vehicle body frame 3, and a transmission case 5 is provided behind the engine 4. A front wheel 6 is provided on each of the left and right sides of the mission case 5 via a front axle case (not shown). Behind the mission case 5 is provided a rear axle case 8 on which the rear wheels 7 are supported on the left and right. That is, the traveling machine body 2 includes front wheels 6 on the left and right of the front part, and rear wheels 7 on the left and right of the rear part, respectively, and the body is supported by the front wheels 6 and the rear wheels 7 so as to be able to travel.

  The bonnet 9 includes an engine 4, a control unit (not shown), a generator (not shown), a radiator (not shown), a cooling fan (not shown), and the like. On both the left and right sides of the bonnet 9, a preliminary seedling stage 10 attached to the vehicle body frame 3 is provided. A battery (not shown) supported by the vehicle body frame 3 is provided below the right side seedling stage 10. The generator is connected to the output portion of the engine 4 so as to operate using the engine 4 as power. The battery is connected to the generator, and the electric power generated by the generator is charged into the battery. The vehicle body frame 3 is covered from above by a vehicle body cover 11. A steering handle 12 is provided at the rear of the bonnet 9 so as to project upward, and a driver's seat 13 is provided behind the steering handle 12 at a predetermined distance. Operation | movement of the various apparatuses with which the rice transplanter 1 is provided is controlled by the control part.

  The power of the engine 4 is transmitted from the output unit to the transmission case 5 via an HST (Hydraulic Static Transmission) which is a hydrostatic continuously variable transmission (not shown). The mission case 5 includes a main clutch (not shown), a transmission (not shown), a differential (not shown), and the like. The left and right front wheels 6 are linked and connected to the output portion of the engine 4 through a transmission and a differential device inside the transmission case 5 and a power transmission mechanism including a gear and a shaft built in the front axle case. Further, the left and right rear wheels 7 are connected via a transmission inside the transmission case 5, a drive shaft 14 extending rearward from the rear of the transmission case 5, a power transmission mechanism including a gear and a shaft built in the rear axle case 8, and the like. In conjunction with the output of the engine 4. The traveling machine body 2 is configured to drive the front wheels 6 and the rear wheels 7 by the power of the engine 4 so as to move forward or backward.

  In addition, the traveling machine body 2 includes a fertilizer device 15 behind the driver seat 13. The fertilizer applicator 15 includes a plurality of fertilizer units that are arranged in a line in the left-right direction. Each fertilizer application unit corresponds to each of a plurality of planting apparatuses 22 to be described later, and a hopper 16 that stores a medicine such as fertilizer as a content, and a feeding unit 17 that takes out a predetermined amount of the medicine from the hopper 16. And a discharging device 19 for discharging the medicine taken out from the hopper 16 to the field through a flexible hose 18. One end of the hose 18 serving as a medicine discharge port is located in the vicinity of the corresponding planting device 22.

  The traveling machine body 2 is not limited to the above-described configuration, and the planting unit 20 as the first working unit is connected to the traveling machine body 2 so that the planting unit 20 can plant seedlings while traveling. For example, a configuration without the fertilizer application 15 or a configuration with an electric motor as a power source instead of the engine 4 may be used.

  The planting unit 20 includes a seedling platform 21 on which a seedling mat is placed, and a plurality of planting devices 22 that plant seedlings in a farm field. The planting part 20 is connected to the rear part of the traveling machine body 2 via a lifting link mechanism including a top link 23 and a lower link 24, and is lifted and lowered by a hydraulic lifting device (not shown) provided in the traveling machine body 2. It is configured as follows.

  Here, the planting part 20 of this embodiment is an 8-row planting type. The seedling mounting base 21 is composed of eight unit seedling mounting bases 25a to 25h arranged in a line in the left-right direction, and is inclined to the front height and the rear low. Eight planting devices 22a to 22h are arranged in a row in the left-right direction behind the lower end of the seedling stage 21. The eight planting devices 22a to 22h correspond to the eight unit seedling platforms 25a to 25h, respectively, and the planting unit 20 includes one planting device 22 for one unit seedling platform 25. It is. In addition, the planting part 20 is not limited to an 8-row planting type, A 6-row planting type etc. may be sufficient.

  The planting unit 20 includes a planting frame 26 that supports the seedling mounting table 21 and a plurality of planting devices 22 below the seedling mounting table 21. The planting frame 26 includes a main frame 27 extending in the left-right direction and four planting transmission cases 28a to 28d extending rearward from the main frame 27. A planting device 22 is disposed on the left and right of the rear end of each planting transmission case 28. A center case 29 is disposed substantially in the center of the main frame 27 in the left-right direction. Although details will be described later, the center case 29 has a built-in power transmission mechanism such as a gear (not shown), and the power from the engine 4 is provided in the center case 29. Transmitted to the shaft. Further, in the planting transmission case 28, the power from the engine 4 transmitted to the center case 29 is transmitted to the two planting devices 22 arranged in the respective planting transmission cases 28. A power transmission shaft (not shown) is built in. Also, below the planting frame 26, a center float 30 and a pair of left and right side floats 31 that are grounded when planting seedlings are provided.

  The seedling stage 21 is supported by the main frame 27 and the planting transmission case 28 via the lower guide rail 32 and the upper guide rail 33, and is configured to reciprocate left and right relative to the planting transmission case 28. . The two unit seedling platforms 25a and 25b located on the left side are configured to be able to be removed from the planting unit 20 in a connected state. Moreover, although mentioned later for details, the seedling mounting stand 21 is a vertical feed mechanism that conveys the placed seedling mat from the top to the bottom, a seedling mat presser that holds the seedling mat against the seedling mounting table 21, An upper support bar 57 and two lower support bars 58 that support the two unit seedling platforms 25a and 25b that have been removed are also provided.

  The planting device 22 is a rotary planting device, and includes a rotary case 34 that is rotatably supported by the planting transmission case 28, a planting case 35 that is rotatably supported at both ends of the rotary case 34, and the like. Is done. Inside the rotary case 34, a power transmission mechanism such as a gear (not shown) which is interlocked with the planting case 35 is incorporated. On the other hand, the planting case 35 includes a planting claw 36 and a push rod (not shown) configured to be able to advance and retract in the axial direction along the planting claw 36.

  The planting device 22 is configured such that when the rotary case 34 makes one rotation, the planting case 35 makes one rotation in the opposite direction with respect to the rotary case 34. The planting device 22 has an elliptical closed loop in which the planting claw 36 reciprocates between the seedling stage 21 and the field, and the locus of the planting claw 36 with respect to the planting transmission case 28 is long in the vertical direction. It is comprised so that it may become a shape-like locus | trajectory. Further, the push rod advances toward the tip of the planting claw 36 when the tip of the planting claw 36 comes close to the lower limit of the reciprocation as the rotary case 34 rotates, and the planting claw 36 is moved forward. It is comprised so that it may reverse | retreat from the front-end | tip of the planting nail | claw 36 when it raises from the descent | fall lower limit of reciprocation.

  The planting device 22 configured as described above is configured so that the planting claw 36 descends from the seedling mat placed on the seedling platform 21 by the planting claw 36 when the planting claw 36 descends downward from above the seedling platform 21. The tip of the planting claw 36 is inserted into the field in the vicinity of the lowering lower limit point of the tip of the planting claw 36. At this time, the seedling scraped by the push rod is pushed out toward the field, and the seedling is planted in the field. Thereafter, the planting claws 36 are lifted so as to come out of the field.

  Next, a power transmission path from the engine 4 to the planting unit 20 will be described. FIG. 3 is a diagram for explaining a power transmission path to the planting unit 20. 3, the leftmost planting transmission case 28a, the rightmost planting transmission case 28d, and the planting devices 22a and 22b disposed in these planting transmission cases 28a and 28d. , 22g, 22h, etc. are omitted. As described above, the power of the engine 4 is transmitted from the output unit to the transmission case 5 via the HST, shifted in the transmission case 5, and transmitted to the planting unit 20 via the inter-strain transmission 37. The power of the engine 4 transmitted to the mission case 5 is distributed and transmitted to the left and right front axles, the drive shaft 14, and other devices.

  The stock transmission 37 is disposed at the rear of the traveling machine body 2 (see FIG. 1), and the power from the transmission case 5 is transmitted to the stock input shaft 38. The power transmitted to the inter-stock input shaft 38 is composed of a sub-inter-substitution transmission mechanism 39 composed of a plurality of gears and shifters that can be shifted in two stages, and a plurality of gears and shifters that can be shifted in three stages. Is transmitted to the inter-stock output shaft 42 via the main inter-mesh transmission mechanism 40 and the planting clutch 41. Therefore, the inter-company transmission 37 can shift the power in six stages by the sub-sub-system transmission mechanism 39 and the main inter-company transmission mechanism 40. The main-strain transmission mechanism 40 includes an eccentric gear, and is configured to be able to shift the power in three stages of two stages of constant speed and one stage of inconstant speed. The inter-shaft transmission 37 is configured to transmit the power transmitted to the inter-shaft input shaft 38 to the fertilizer output shaft 44 via the fertilizer clutch 43 on the upstream side of the main inter-shaft transmission mechanism 40. The fertilizer application device 15 described above is interlocked with the fertilizer output shaft 44.

  The stock output shaft 42 is interlocked and connected to the drive input shaft 46 of the center case 29 via the PTO shaft 45. The center case 29 is provided with a planting output shaft 47 that protrudes from the left and right side surfaces and extends in the left-right direction. Inside the center case 29, a power transmission mechanism including a gear and the like for transmitting the power of the drive input shaft 46 to the planting output shaft 47 is incorporated.

  Similarly to the planting output shaft 47, the center case 29 is provided with a lateral feed output shaft 48 that protrudes from the left and right side surfaces and extends in the left-right direction. The center case 29 receives the power transmitted to the drive input shaft 46 via a lateral feed speed change mechanism 49 including a plurality of gears and shifters that can be shifted in three stages on the upstream side of the planting output shaft 47. Further, it is configured to be able to transmit to the lateral feed output shaft 48. That is, the center case 29 is configured to be able to distribute the power transmitted to the drive input shaft 46 to the planting output shaft 47 and the lateral feed output shaft 48. The seedling mounting table 21 is configured to reciprocate left and right with respect to the planting transmission case 28 by the rotation of the lateral feed output shaft 48.

  Four power transmission shafts 50 built in the respective planting transmission cases 28 are linked to the planting output shaft 47 via safety clutches 51, respectively. Here, the planting output shaft 47 is divided so as to correspond to the four power transmission shafts 50 and is connected by a coupling (not shown).

  A drive shaft 53 is interlocked and connected to the rear end portion of the power transmission shaft 50 via a strut clutch 52. The drive shaft 53 protrudes left and right from the rear end portion of the planting transmission case 28, and the rotary case 34 is fixed. The rotary case 34 incorporates a plurality of gears and has two support shafts 54 protruding sideways. The two support shafts 54 are linked to the drive shaft 53 via gears built in the rotary case 34, respectively, and the planting case 35 is fixed.

  Then, the planting device 22 rotates the drive shaft 53 by the power transmitted from the planting output shaft 47 via the power transmission shaft 50, so that the rotary case 34 rotates and the planting is performed as described above. The case 35 rotates in the opposite direction with respect to the rotary case 34, and the planting claws 36 reciprocate between the seedling stage 21 and the field, so that the seedling is planted in the field.

  Here, the dispersion output shaft 55 is linked to the power transmission shaft 50 built in the planting transmission case 28b. The spray output shaft 55 protrudes rearward from the rear end portion of the planting transmission case 28b, and a crank 56 is fixed to the front end thereof. The output shaft of the crank 56 is connected to one end of an input rod 112 of a spraying power transmission mechanism 111 that transmits power to the first spraying device 85 and the second spraying device 101. In addition, the spreading | diffusion output shaft 55 has the quick joint 116 in the part protruded from the planting transmission case 28b. The spreading output shaft 55 is configured to be divided by the quick joint 116 on the power transmission shaft 50 side and the input rod 112 side without using a tool or the like. Further, the output shaft of the crank 56 is arranged eccentrically at a position parallel to the spray output shaft 55 and deviated from the spray output shaft 55. That is, the output shaft of the crank 56 is eccentrically rotated about the spray output shaft 55.

  As will be described in detail later, the spreading power transmission mechanism 111 includes an input rod 112, two output rods 113 and 114, a counter arm 115, and the like. The other end of the input rod 112 is connected to the counter arm 115. One end of the output rod 113 is connected to the power transmission system of the first spraying device 85, and the other end is connected to the counter arm 115. One end of the output rod 114 is connected to the second spraying device 101 to the power transmission system, and the other end is connected to the counter arm 115. The counter arm 115 is supported so as to be swingable in the front-rear direction with a swing shaft 124 extending in the left-right direction as a support shaft. The spraying power transmission mechanism 111 is configured to transmit power from the planting unit 20 (power transmission shaft 50) to the first spraying device 85 and the second spraying device 101 as the second working unit. Yes.

  In addition, the structure which transmits motive power from the engine 4 to the planting part 20 is not limited to the above-mentioned structure. For example, it may be configured to transmit power using an endless chain instead of the power transmission shaft 50 or the like. In addition, power transmission from the planting unit 20 to the first spraying device 85 and the second spraying device 101 by the spraying power transmission mechanism 111 transmits power from the power transmission shaft 50 built in the planting transmission case 28b. It is not limited to the structure to do. The spreading power transmission mechanism 111 may be configured to transmit power from the power transmission system of the planting unit 20, and power is transmitted from a power transmission shaft 50 incorporated in another planting transmission case 28, for example, a planting transmission case 28c. May be configured to transmit.

  Next, the seedling stand 21 will be described. 4 is a schematic rear view showing an example of the seedling stage 21, FIG. 5 is a schematic side view of the seedling stage 21 of FIG. 4, and FIG. 6 shows an example of the seedling mat presser 60. 7 is a schematic perspective view, FIG. 7 is a schematic side view showing an example of a state in which the seedling mount 21 is folded, and FIG. 8 shows an example of a state in which the seedling mat presser 60 is rotated upward. FIG. 9 is a schematic side view showing an example of a state in which the seedling mat presser 60 is rotated downward. 5A is an overall view of the seedling stage 21, and FIG. 5B is an enlarged view of the vicinity of the support plate 75. FIG. 6 is a perspective view of the seedling mat presser 60 as viewed from the diagonally upper left side. As described above, the seedling stage 21 is composed of eight unit seedling stages 25a to 25h arranged in a line in the left-right direction, and is inclined to the front height and the rear low. The two unit seedling platforms 25a and 25b located on the left side are configured to be able to be removed in a connected state.

  The seedling stage 21 also includes an upper support bar 57, two lower support bars 58 and 58, a vertical feed mechanism 59, three seedling mat pressers 60a, 60b, and 60c. The upper support bar 57 is located on the upper side of the seedling stage 21, is attached between the unit seedling stage 25d and the unit seedling stage 25e, and extends upward. The two lower support bars 58, 58 are located on the lower side of the seedling stage 21, and are attached between the unit seedling stage 25c and the unit seedling stage 25d and between the unit seedling stage 25e and the unit seedling stage 25f. And extends upward.

  Then, as shown in FIG. 7, the seedling stage 21 removes the two unit seedling stages 25a and 25b located on the left side, and attaches the unit seedling stage 25a and 25b to the upper support bar 57 and the two lower support parts. It can be folded by being supported by the bars 58 and 58, and the width in the left-right direction can be reduced. At this time, the unit seedling platforms 25a and 25b are located above the unit seedling platforms 25d and 25e. The tip of the upper support bar 57 is inserted into a through hole (not shown) formed in the upper guide rail 33. The left edge of the unit seedling table 25a and the right side of the unit seedling table 25b are fixed by a lock mechanism (not shown) provided at the tip of the lower support bar 58, respectively. Accordingly, the unit seedling platforms 25a and 25b are supported at three points by the upper support bar 57 and the two lower support bars 58 and 58, and are not easily rattled and can be easily attached and detached.

  Two vertical feed mechanisms 59 are provided on each unit seedling mount 25 and are constituted by a driven roller 61, a drive roller 62, a seedling feed belt 63, and the like. The placement portion 64 on which the seedling mat is placed has an opening 67 penetrating between the placement surface 65 on which the seedling mat is placed and the back surface 66 from approximately the center in the vertical direction to the lower portion. The driven roller 61 and the driving roller 62 are located on the back surface 66 side of the mounting portion 64 and are disposed so as to cross the upper and lower portions of the opening 67. The seedling feeding belt 63 is wound around the driven roller 61 and the driving roller 62 so as to be circumscribed. A large number of projections (not shown) are formed on the surface of the seedling feeding belt 63 and protrude from the opening 67 of the placement portion 64 toward the placement surface 65. The vertical feed mechanism 59 intermittently conveys the seedling mat held so as to be sandwiched between the seedling mat presser 60 and the seedling feeding belt 63 by intermittently rotating the drive roller 62. Is configured to do.

  The seedling mat presser 60a corresponds to the two unit seedling mounts 25a and 25b, and the seedling mat presser 60b corresponds to the three unit seedling mounts 25c, 25d and 25e, and the seedling mat presser 60c corresponds to the three unit seedling platforms 25f, 25g, and 25h. The three seedling mat pressers 60a, 60b, and 60c have the same configuration, and the configuration will be described below by exemplifying the seedling mat presser 60a shown in FIG. The description of the configuration is omitted as appropriate.

  The seedling mat presser 60 has a plurality of round bar-shaped vertical press bars 68 extending in the vertical direction so as to follow the mounting surface 65 of the mounting part 64 with a predetermined interval, and a round bar-shaped upper part extending in the left-right direction. A connecting rod 69, a round bar-shaped lower connecting rod 70 extending in the left-right direction, a round bar-shaped seedling scraping tool 71 extending in the left-right direction, and the like are provided. The vertical presser bar 68, the upper connecting bar 69, the lower connecting bar 70, and the seedling scraping tool 71 are formed of round bar-like members that can be flexibly deformed by an operator. The seedling mat presser 60 has two vertical pressing bars 68 for one unit seedling mounting base 25. That is, the seedling mat presser 60a corresponding to the two unit seedling mounts 25a and 25b has four vertical pressing bars 68. The seedling mat presser 60b corresponding to the three unit seedling platforms 25c, 25d, and 25e and the seedling mat presser 60c corresponding to the three unit seedling platforms 25f, 25g, and 25h each have six vertical pressers 68. Have

  The upper end of the vertical presser bar 68 is bent rearward at an acute angle when viewed from the side, and the lower end of the vertical presser bar 68 is bent rearward at a substantially right angle when viewed from the side. The upper end of the vertical pressing rod 68 is joined to the upper connecting rod 69 by welding or the like, and the lower end of the vertical pressing rod 68 is joined to the lower connecting rod 70 by welding or the like. In the seedling mat presser 60a, four vertical presser bars 68 are connected by an upper connecting bar 69 and a lower connecting bar 70.

  The left and right ends of the upper connecting rod 69 and the lower connecting rod 70 protrude outward (sideward) from the vertical presser bars 68 located at the left and right ends. Both left and right end portions of the upper connecting rod 69 are bent forward along the upper end portion of the vertical pressing rod 68 in a side view, and further bent so as to extend outward in the left and right directions in a rear view. Then, both end portions of the upper connecting rod 69 extending left and right have annular flanges 72 respectively. Further, both left and right end portions of the lower connecting rod 70 each have an annular flange 73.

  Cylindrical collars 74 are fixed to both ends of the round bar-shaped seed scraping tool 71. At one end of the cylindrical collar 74, an annular flange protruding in the radial direction is formed. Flat support plates 75 extending upward and rearward are joined to the vertical presser bars 68 located at the left and right ends by welding or the like. The support plate 75 is disposed below the vertical presser bar 68 and has an engagement hole 76 that is a through hole. The engagement hole 76 extends between the fitting parts 77a, 77b, 77c, 77d, and 77e, which are five circular through holes arranged in rows in the vertical direction, and the adjacent fitting parts 77. And a passage portion which is one through hole. The peripheral edge of the engagement hole 76 is formed in a substantially wave shape. The diameter of the fitting portion 77 corresponds to the diameter of the collar 74 and is larger than the width of the passage portion. The width of the passage portion is larger than the diameter of the seedling sorter 71 and smaller than the diameter of the collar 74.

  Both ends of the seedling sorter 71 are supported by the support plate 75. More specifically, a cylindrical collar 74 attached to the seedling sorter 71 is fitted to and supported by the fitting portion 77 of the engagement hole 76. Here, although details will be described later, the seedling scraping tool 71 is for improving the spraying of the medicine on the seedling mat by the first spraying device 85. The seedling scraping tool 71 is located in the vicinity of the spraying port of the first spraying device 85, and is placed on the seedling mount 21 and conveyed downward by the vertical feed mechanism 59. It is comprised so that it may contact | abut in the middle part.

  In addition, the distance d1 from the mounting surface 65 (the seedling feeding belt 63) of the seedling mounting base 21 to the seedling sorting tool 71 can be changed by changing the fitting portion 77 into which the collar 74 is fitted. Since the engagement hole 76 has five fitting portions 77a, 77b, 77c, 77d, and 77e, the distance d1 can be changed in five steps. In order to change the distance d 1, the seedling scraping tool 71 is bent to disengage the collar 74 from the fitting portion 77, and the collar 74 is fitted to the other fitting portion 77. At this time, both end portions of the seedling sorter 71 can be moved to another fitting portion 77 through the passage formed between the adjacent fitting portions 77 without being pulled out from the engagement hole 76. . Therefore, the fitting portion 77 into which the collar 74 is fitted can be easily changed, and the usability is good.

  The seedling mat presser 60 is configured such that an upper connecting rod 69 is detachably supported by two upper support arms 79 formed on the seedling mount 21 and is connected to two lower support arms 80 formed on the seedling mount 21 by lower connection. The rod 70 is detachably supported and attached to the seedling table 21. The two upper support arms 79 are disposed on the upper side of the seedling stage 21 and on the left edge of the unit seedling stage 25a and the right edge of the unit seedling stage 25b. The upper support arm 79 has fitting holes 81a, 81b, and 81c that are three circular through holes arranged in rows in the vertical direction. Then, both ends of the upper connecting rod 69 are inserted into any one of the fitting holes 81 of the upper support arm 79 and supported rotatably. In addition, by bending the upper connecting rod 69, both ends of the upper connecting rod 69 can be pulled out from the fitting hole 81, and the fitting hole 81 in which the upper connecting rod 69 is supported can be changed.

  On the other hand, the two lower support arms 80 are disposed on the lower side of the seedling stage 21 and on the left edge of the unit seedling stage 25a and the right edge of the unit seedling stage 25b. The lower support arm 80 has an engagement hole 82 that is a through hole. The engagement hole 82 is formed from fitting parts 83a, 83b, 83c, and 83d that are four circular through holes arranged in rows in the vertical direction. Adjacent fitting portions 83 overlap each other, and the periphery of the engagement hole 82 is formed in a substantially wave shape. The lower connecting rod 70 is rotatably supported in a state where both ends thereof are inserted into the engagement holes 82 of the lower support arm 80 and fitted into any of the fitting portions 83. In addition, by bending the lower connecting rod 70, both ends of the lower connecting rod 70 can be pulled out from the engaging holes 82, and the fitting portion 83 into which both ends of the lower connecting rod 70 are fitted can be changed. .

  The seedling mat presser 60 having such a configuration places the seedling mounting table 21 by changing the fitting hole 81 that supports the upper connecting rod 69 and the fitting portion 83 that supports the lower connecting rod 70. The distance d2 from the surface 65 (the seedling feeding belt 63) can be changed. Therefore, regardless of the thickness of the seedling mat placed on the seedling mounting table 21, the seedling mat can be suitably held by the seedling mat presser 60 and the seedling feeding belt 63, and the seedling mat can be transported satisfactorily. it can.

  Further, as shown in FIG. 8, the seedling mat presser 60 is formed by pulling out both ends of the lower connecting rod 70 from the engaging hole 82, so that the upper connecting rod 69, which is a part supported by the upper support arm 79. The both ends can be pivoted upward (forward), and the placement surface 65 of the seedling stage 21 can be easily released. Further, as shown in FIG. 9, the seedling mat presser 60 is formed by pulling out both ends of the upper connecting rod 69 from the fitting hole 81 so that the lower connecting rod 70 is supported by the lower support arm 80. Both ends can be pivoted downward (backward), and the placement surface 65 of the seedling stage 21 can be easily released.

  That is, the seedling mat presser 60 is rotatably connected to the seedling mount 21 and holds the seedling mat pressed onto the seedling mounting base 21 and presses the seedling mat onto the seedling mounting base 21. Can be switched to a released state.

  Therefore, the seedling mat presser 60 is easy to use without interfering with removal of the remaining seedling mat, lifting upward, and maintenance of the seedling mounting table 21. Moreover, since the rotation of the seedling mat presser 60 can be selected between the upper side and the lower side according to the work situation, it is easy to use.

  Here, the seedling sorter 71 is supported by a support plate 75 attached to the vertical presser bar 68. When the seedling mat presser 60 is rotated upward or downward, the seedling sorter 71 is used as the seedling mat. It rotates together with the presser 60. Accordingly, the placement surface 65 of the seedling placing table 21 can be easily released without removing the seedling separating tool 71 separately from the seedling mat presser 60, and the remaining seedling mat can be removed, lifted upward, and seedlings. Maintenance of the mounting table 21 can be easily performed. In addition, since the seedling mat presser 60 and the seedling scraping tool 71 can be set at the working position at the same time, it is possible to prevent forgetting operations and to improve usability.

  Next, the 1st spreading | diffusion apparatus 85 and the 2nd spreading | diffusion apparatus 101 as a 2nd working part are demonstrated. FIG. 10 is a schematic side view illustrating an example of the first spraying device 85 and the second spraying device 101, and FIG. 11 illustrates an example of the spraying unit 86 of the first spraying device 85 in FIG. FIG. 12 is a schematic rear view, and FIG. 12 is a schematic rear view showing the second spraying device 101 of FIG. In FIG. 10, the placement portion 64 of the seedling stage 21 is shown in cross section, and the seedling mat 98, the seedling 99, and the planting device 22 placed on the seedling stage 21 are indicated by two-dot chain lines. . Further, in FIG. 11, a front frame 130 of a parallel link mechanism 126 described later is indicated by a two-dot chain line.

  The 1st spreading | diffusion apparatus 85 and the 2nd spreading | diffusion apparatus 101 as a 2nd operation | working part are integrally attached to the rear part of the planting part 20 via the parallel link mechanism 126 mentioned later. The first spraying device 85 sprays the medicine from above onto the seedling mat 98 placed on the seedling placing table 21, and is disposed behind the seedling placing table 21. The second spraying device 101 sprays the medicine on the farm field, and is disposed behind the first spraying device 85.

  First, the first spraying device 85 will be described. As shown in FIG. 2, the first spraying device 85 includes four spraying units 86a, 86b, 86c, and 86d. The four spraying units 86a, 86b, 86c, 86d are arranged in rows in the left-right direction. One spraying unit 86 corresponds to two unit seedling platforms 25. For example, a spraying unit 86a located on the left side corresponds to two unit seedling platforms 25a and 25b located on the left side, and is viewed in plan view. Are arranged between the unit seedling stage 25a and the unit seedling stage 25b. FIG. 11 shows two spraying units 86a and 86b located on the left side. The four spraying units 86a, 86b, 86c, 86d have the same configuration. In the following, the configuration will be described by exemplifying the spraying unit 86a located on the left side, and the configuration of the other spraying units 86b, 86c, 86d. Will be omitted as appropriate.

  The spreading unit 86 includes a hopper 87, two feeding portions 88, 88, two outlet pipes 89, 89, a feeding drive shaft 90, a connecting arm 91, and the like. The hopper 87 is a transparent resin container having a lid that closes the upper opening, and stores a medicine therein. The lower portion of the hopper 87 is formed to be bifurcated left and right at the center in the left-right direction. The lower part of the hopper 87 that is divided into right and left is formed in a funnel shape that narrows downward. In addition, inside the hopper 87, a partition plate 92 is formed at a bifurcated branch portion, and is divided into two chambers on the left and right.

  The upper ends of the two feeding portions 88 and 88 are respectively connected to the lower end formed in a funnel shape divided into two forks of the hopper 87. One end of a lead-out pipe 89 is connected to the lower part of the two feeding parts 88, 88, respectively. Inside the two feeding portions 88, 88, substantially cylindrical feeding rolls 93, 93 extending in the left-right direction are accommodated rotatably. The substantially cylindrical feeding roll 93 has a plurality of grooves (not shown) extending in the axial direction on the outer peripheral surface. The two feeding rolls 93, 93 are positioned coaxially with the feeding drive shaft 90 extending in the left-right direction, and are fixed to the feeding drive shaft 90, respectively. By rotating the feeding drive shaft 90, the two feeding rolls 93 and 93 respectively accommodated in the two feeding portions 88 and 88 can be rotated simultaneously. The inside of the feeding portion 88 is partitioned by a feeding roll 93 into an upper space communicating with the hopper 87 and a lower space communicating with the outlet pipe 89.

  The medicine accommodated in the hopper 87 is supplied to the upper space partitioned by the feeding roll 93 inside the feeding portion 88, and a part of the medicine is accommodated in a groove formed on the outer peripheral surface of the feeding roll 93. The By rotating the feeding roll 93, the medicine accommodated in the groove of the feeding roll 93 moves to a lower space communicating with the outlet pipe 89 and is supplied to the outlet pipe 89. Therefore, the medicine accommodated in the hopper 87 is fed out to the outlet pipe 89 by a predetermined amount by the feeding portion 88.

  The amount of medicine delivered by the delivery unit 88 can be adjusted by changing the size and shape of the groove of the delivery roll 93 and the rotational speed of the delivery drive shaft 90. In addition, the spreading | diffusion unit 86 is comprised so that a chemical | medical agent may be delivered intermittently by rotating the delivery drive shaft 90 intermittently.

  The spray ports 94, 94, which are the other ends of the lead-out pipes 89, 89, are arranged near the lower portion of the seedling mounting table 21 so as to face the mounting surface 65 on which the seedling mat 98 is mounted. The outlet pipe 89 located on the left side corresponds to the unit seedling stage 25a, and the outlet pipe 89 located on the right side corresponds to the unit seedling stage 25b. Then, the medicines fed out by the two feeding parts 88 and 88 are discharged from the spraying ports 94 and 94 and sprayed on the seedling mats 98 placed on the unit seedling mounting table 25a and the unit seedling mounting table 25b, respectively.

  The right end of the feed drive shaft 90 is interlocked and connected to a gear case 96 having a built-in power transmission mechanism (not shown) composed of gears and the like via a meshing clutch 95. An intermediate drive shaft 97 to which the output rod 113 of the spraying power transmission mechanism 111 is interlocked and connected to the gear case 96 via a first one-way clutch (not shown). Therefore, the power transmitted to the dispersed power transmission mechanism 111 is transmitted to the feeding drive shaft 90 via the intermediate drive shaft 97 and the gear case 96.

  The connecting arm 91 is a rod-like member extending from one feeding portion 88 to the other feeding portion 88, and is detachably attached to a mounting flange 168 formed on the upper surface of the front frame 130 of the parallel link mechanism 126 described later. Therefore, the spreading unit 86 can be detached from the front frame 130 of the parallel link mechanism 126 by releasing the engagement of the meshing clutch 95. The gear case 96 is also attached to the front frame 130.

  Here, the spraying unit 86 b has a symmetrical configuration with the spraying unit 86 a and is disposed on the right side of the gear case 96. The feeding drive shaft 90 of the spreading unit 86a and the feeding drive shaft 90 of the spreading unit 86b are arranged coaxially. Further, the feeding drive shaft 90 of the spraying unit 86b is interlocked and connected to the gear case 96 through the meshing clutch 95, similarly to the spraying unit 86a. The power input to the gear case 96 is distributed to the spraying unit 86a and the spraying unit 86b.

  Further, the spraying unit 86c has a symmetrical configuration with the spraying unit 86b, and the spraying unit 86d has a symmetrical configuration with the spraying unit 86a. In the spraying unit 86c and the spraying unit 86d, similarly to the spraying unit 86a and the spraying unit 86b, the respective feeding drive shafts are linked to another gear case 96 linked to the intermediate drive shaft 97. The power transmitted to the spraying power transmission mechanism 111 is transmitted to the respective feeding drive shafts of the spraying unit 86c and the spraying unit 86d via the intermediate drive shaft 97 and another gear case 96. Therefore, the power transmitted to the spraying power transmission mechanism 111 is distributed to the four spraying units 86a, 86b, 86c, and 86d by the intermediate drive shaft 97 and the two gear cases 96.

  Here, as described above, the seedling mount 21 on which the seedling mat 98 on which the medicine is sprayed by the spraying unit 86 is placed includes the seedling mat presser 60. A seedling separating tool 71 is attached to the seedling mat presser 60. As shown in FIG. 10, the seedling scraping tool 71 is located in the vicinity of the spraying port 94 and is transferred by the vertical feed mechanism 59 downward on the placement surface 65 of the seedling placement base 21. It is comprised so that it may contact | abut to the plant height midway part of the seedling 99 of this. Therefore, when the seedling mat 98 is conveyed downward by the vertical feed mechanism 59, the seedling 99 comes into contact with the seedling sorting tool 71 and is tilted forward, so that the floor soil of the seedling mat 98 is placed behind the seedling sorting tool 71. A space 100 in which the portion is exposed is formed. The spraying port 94 of the spraying unit 86 is arranged so that the medicine is released toward the space 100 formed by the seedling sorting tool 71, and the medicine is not interfered with the seedling 99 and seedling mat 98. It is sprayed on the floor soil. Therefore, the first spraying device 85 can spray the medicine effectively on the seedling mat 98 by the seedling scraping tool 71.

  The seedling stage 21 reciprocates left and right with respect to the planting transmission case 28, but the seedling sorter 71 and the seedling mat 98 attached to the seedling mat presser 60 are integrated with the seedling stage 21. Moving. Therefore, the seedling 99 of the seedling mat 98 is not rubbed with the seedling scraping tool 71 in the left-right direction when the seedling mounting table 21 is reciprocated left and right, and the seedling 99 is prevented from being damaged. In addition, the seedling 99 does not fall in the left-right direction, the space 100 is reliably formed, and effective drug spraying by the first spraying device 85 can be performed.

  Further, since the seedling scraping tool 71 is supported by the support plate 75 so that the distance d1 to the placement surface 65 can be changed, the first spraying device 85 of the first spraying device 85 does not depend on the plant height of the seedling 99 of the seedling mat 98. A space 100 suitable for spraying the medicine can be formed between the seedlings, which is easy to use. Further, if the seedlings 99 have the same overall length, the space 100 can be obtained simply by changing the position of the seedling mat presser 60 (distance d2 to the placement surface 65) even if the thickness of the seedling mat 98 (floor soil portion) changes. It is easy to use.

  The seedling mat presser 60 is not limited to the above-described configuration. The seedling mat presser 60 is for pressing the seedling mat 98 against the seedling stage 21, is attached to the seedling stage 21, the holding state where the seedling mat 98 is pressed against the seedling stage 21, and the seedling Any configuration may be used as long as the mat 98 can be switched to the released state in which the pressing of the mat 98 on the seedling stage 21 is released. For example, the seedling mat presser 60 may have a configuration in which only one of both ends of the upper connecting rod 69 or both ends of the lower connecting rod 70 can be rotated as a support shaft. In addition, the seedling mat presser 60 may be configured to be detachably attached to the seedling mounting base 21 with a bolt or the like.

  The seedling scraping tool 71 is not limited to the above-described configuration. The seedling scraping tool 71 extends in the left-right direction in the vicinity of the spraying port 94 of the spraying unit 86 for spraying the medicine onto the seedling mat 98 placed on the seedling mount 21, and in the middle of the plant height of the seedling 99 of the seedling mat 98. Any structure may be used as long as the seedling 99 is tilted to form the space 100 between the seedlings and attached to the seedling mat presser 60. For example, the seedling sorter 71 may be composed of a plurality of round bar members whose both ends are supported by the support plate 75.

  Next, the second spraying device 101 will be described. The second spraying device 101 includes a hopper 102, a feeding unit 103, a spraying cover 104, a feeding drive shaft 105, and the like. The hopper 102 is a transparent resin container having a lid that closes the upper opening, and stores a medicine therein. The lower part of the hopper 102 is formed in a funnel shape that narrows downward.

  A lower end of the hopper 102 is connected to the upper portion of the feeding portion 103. The lower part of the feeding part 103 is connected to the upper part at the center in the left-right direction of the spray cover 104. The inside of the feeding unit 103 has the same configuration as that of the feeding unit 88 of the first spraying device 85, and a substantially cylindrical feeding roll 106 extending in the left-right direction is rotatably accommodated therein. The substantially cylindrical feeding roll 106 has a plurality of grooves (not shown) extending in the axial direction on the outer peripheral surface. The feeding roll 106 is positioned coaxially with the feeding drive shaft 105 extending in the left-right direction, and is fixed to the feeding drive shaft 105. By rotating the feeding drive shaft 105, the feeding roll 106 accommodated in the feeding unit 103 can be rotated. The inside of the feeding portion 103 is partitioned by the feeding roll 106 into an upper space communicating with the hopper 102 and a lower space communicating with the inside of the spray cover 104.

  The medicine accommodated in the hopper 102 is supplied to the upper space partitioned by the feeding roll 106 inside the feeding portion 103, and a part of the medicine is accommodated in a groove formed on the outer peripheral surface of the feeding roll 106. The By rotating the feeding roll 106, the medicine accommodated in the groove of the feeding roll 106 moves to a lower space communicating with the inside of the spray cover 104 and is supplied to the inside of the spray cover 104. Therefore, the medicine accommodated in the hopper 102 is delivered to the spray cover 104 by a predetermined amount by the delivery unit 103.

  The pay-out driving shaft 105 is interlocked and connected to the output rod 114 of the spraying power transmission mechanism 111 via the second one-way clutch 122. Therefore, the power transmitted to the scattered power transmission mechanism 111 is transmitted to the feed drive shaft 105 via the second one-way clutch 122.

  The amount of medicine delivered by the delivery unit 103 can be adjusted by changing the size and shape of the groove of the delivery roll 106 and the rotational speed of the delivery drive shaft 105. Note that the second spraying device 101 is configured to intermittently feed out the medicine by intermittently rotating the delivery drive shaft 105.

  The spreading cover 104 is a hollow rectangular parallelepiped enclosure having an opening 107 on the lower surface and extending in the left-right direction. The inside of the spreading cover 104 communicates with the lower end of the feeding portion 103 at the upper center in the left-right direction. The spreading cover 104 includes two guide plates 108 extending from the center to the left and right, and a feeding fan 110 fixed to the output shaft of the electric motor. The guide plate 108 has a plurality of through holes 109 formed at predetermined intervals in the left-right direction. By the guide plate 108, a flow path extending from the center to the left and right is formed inside the spray cover 104. The feeding fan 110 is disposed between the two guide plates 108 and below the communicating portion that communicates with the lower end of the feeding portion 103.

  Then, the second spraying device 101 blows off the medicine fed from the feeding unit 103 into the spraying cover 104 to the flow path formed by the guide plate 108 by the rotation of the feeding fan 110. The blown-off medicine is diffused inside the spray cover 104 and released from the opening 107 of the spray cover 104 through the through hole 109 of the guide plate 108 or the gap between the guide plate 108 and the inner surface of the spray cover 104. Sprayed on the field. Therefore, the second spraying device 101 is configured so that the medicine can be dispersed to the left and right and sprayed on the field.

  Here, the chemical | medical agent which the 1st spreading | diffusion apparatus 85 as the 2nd operation | work part and the 2nd spreading | diffusion apparatus 101 spread | disperses is a solid-particulate chemical | medical agent, for example, can be used as a fertilizer or a herbicide.

  In addition, the 1st spreading | diffusion apparatus 85 and the 2nd spreading | diffusion apparatus 101 are not limited to the above-mentioned structure. The 1st spreading | diffusion apparatus 85 should just be the structure which is attached to the rear part of the planting part 20, and spread | disperses a chemical | medical agent from the upper direction to the seedling mat 98 mounted in the seedling mounting stand 21. FIG. The 2nd spraying apparatus 101 should just be the structure attached to the rear part of the planting part 20, and spraying a chemical | medical agent to a farm field. For example, the first spraying device 85 and the second spraying device 101 may be spraying devices that spray a liquid medicine.

  Next, the spreading power transmission mechanism 111 that transmits power to the first spreading device 85 and the second spreading device 101 will be described. FIG. 13 is a schematic side view showing an example of the spreading power transmission mechanism 111. In FIG. 13, a second one-way clutch 122 described later is indicated by a two-dot chain line. As described above, the spreading power transmission mechanism 111 includes the input rod 112, the two output rods 113 and 114, the counter arm 115, and the like, and serves as a second working unit from the planting unit 20 (power transmission shaft 50). The first spraying device 85 and the second spraying device 101 are configured to transmit power.

  One end of the input rod 112 is connected to the power transmission system of the planting unit 20. More specifically, the spraying output shaft 55 that is interlocked with the power transmission shaft 50 that is a part of the power transmission system of the planting unit 20 protrudes rearward from the rear end portion of the planting transmission case 28b. A crank 56 is fixed to the tip of the spray output shaft 55. One end of the input rod 112 is connected to the output shaft of the crank 56. In addition, the spreading | diffusion output shaft 55 has the quick joint 116 in the part protruded from the planting transmission case 28b. And the spreading | diffusion output shaft 55 is comprised by the quick joint 116 so that the input rod 112 side can be separated from the power transmission shaft 50 side without using a tool or the like.

  A resin protective cover 117 having an opening on the upper surface is attached to the rear end portion of the planting transmission case 28b. The lower part of the protective cover 117 is supported at the rear end portion of the planting transmission case 28b so as to be rotatable up and down about the horizontal direction. In addition, the upper portion of the protective cover 117 has a locking projection (not shown) that fits with an engaging portion (not shown) formed at the rear end of the planting transmission case 28b. The engaging portion of the planting transmission case 28b and the locking projection of the protective cover 117 are configured to be disengaged when the protective cover 117 rotates downward about the left-right direction. The spray output shaft 55, the quick joint 116, the crank 56, and one end of the input rod 112 are covered with the protective cover 117.

  One end of the output rod 113 is connected to the power transmission system of the first spreading device 85. More specifically, it is connected to a connection arm 118 that is a substantially triangular flat plate in a side view. The connection arm 118 is rotatably supported by an intermediate drive shaft 97 extending in the left-right direction. The intermediate drive shaft 97 is linked to the feed drive shaft 90 of the first spreading device 85 via a gear case 96. A first one-way clutch 119 is attached to the intermediate drive shaft 97. An elastic force of a torsion coil spring (not shown) acts counterclockwise (counterclockwise) in FIG. 13 and a contact arm 120 extending from the first one-way clutch 119 is connected to the first one-way clutch 119. It abuts against the edge of the arm 118. In FIG. 13, the first one-way clutch 119 is connected to the intermediate drive shaft 97 when rotating clockwise (clockwise), and is intermediately driven when rotating counterclockwise (counterclockwise). The shaft 97 is cut off. Further, the connecting arm 118 is orthogonal to the intermediate drive shaft 97.

  When the connection arm 118 rotates clockwise, the first one-way clutch 119 is rotated clockwise against the elastic force of the torsion coil spring while being connected to the intermediate drive shaft 97, and the intermediate drive shaft 97 is rotated clockwise. It is turned around. On the other hand, when the connection arm 118 rotates counterclockwise, the first one-way clutch 119 rotates counterclockwise along with the connection arm 118 by the elastic force of the torsion coil spring in a disconnected state with the intermediate drive shaft 97. Is done.

  As described above, one end of the output rod 113 is linked to the intermediate drive shaft 97 that is a part of the power transmission system of the first spraying device 85 via the connection arm 118 and the first one-way clutch 119. Yes.

  One end of the output rod 114 is connected to the power transmission system of the second spraying device 101. More specifically, it is connected to a connection arm 121 that is a substantially triangular flat plate in a side view. The connection arm 121 is rotatably supported on the feeding drive shaft 105 of the second spraying device 101. A second one-way clutch 122 is attached to the feeding drive shaft 105. The second one-way clutch 122 has an elastic force of a torsion coil spring (not shown) acting clockwise (clockwise) in FIG. 13, and a contact arm 123 extending from the second one-way clutch 122 has a connection arm. 121 is in contact with the edge of 121. In FIG. 13, the second one-way clutch 122 is disconnected from the feeding drive shaft 105 when rotating clockwise (clockwise) and is driven when rotating counterclockwise (counterclockwise). The shaft 105 is connected. Further, the connecting arm 121 is orthogonal to the feeding drive shaft 105.

  When the connection arm 121 rotates counterclockwise, the second one-way clutch 122 is rotated counterclockwise against the elastic force of the torsion coil spring in a connected state with the extension drive shaft 105, and the extension drive shaft 105. Is rotated counterclockwise. On the other hand, when the connection arm 121 rotates clockwise, the second one-way clutch 122 is rotated clockwise along with the connection arm 121 by the elastic force of the torsion coil spring in a disconnected state from the feeding drive shaft 105. .

  As described above, one end of the output rod 114 is interlocked to the feed drive shaft 105 that is a part of the power transmission system of the second spraying device 101 via the connection arm 121 and the second one-way clutch 122. Yes.

  The flat counter arm 115 is supported so as to be swingable in the front-rear direction with a swing shaft 124 extending in the left-right direction as a support shaft. The swing shaft 124 is fixed to a connection bracket of a parallel link mechanism 126 described later. The counter arm 115 includes an intermediate drive shaft 97 that is linked to the feed drive shaft 90 of the first spraying device 85 via a gear case 96, the feed drive shaft 105 of the second spraying device 101, and a swing shaft 124. It is orthogonal to both. The other end of the input rod 112, the other end of the output rod 113, and the other end of the output rod 114 are connected to the counter arm 115.

  The counter arm 115 is disposed between the first spraying device 85 and the second spraying device 101. The input rod 112 extends vertically from the output shaft of the crank 56 and is connected to the counter arm 115, the output rod 113 extends forward from the counter arm 115 and is connected to the connection arm 118, and the output rod 114 is connected to the counter arm 115. The arm 115 extends rearward and is connected to the connection arm 121.

  Note that the other end of the input rod 112 is connected to the lower end of the counter arm 115. The other end of the output rod 113 and the other end of the output rod 114 are connected to the counter arm 115 above a virtual line (not shown) passing through the other end of the input rod 112 and the swing shaft 124.

  The other end of the output rod 114 is connected to the counter arm 115 above the other end of the output rod 113. The upper part of the counter arm 115 to which the other end of the output rod 114 is connected is on the right side of the counter arm 115 to which the other end of the input rod 112 and the other end of the output rod 113 are connected. It is offset to the back side. The output rod 113 is orthogonal to the intermediate drive shaft 97, and the output rod 114 is orthogonal to the payout drive shaft 105. The upper part of the counter arm 115 is located on substantially the same vertical plane as the connection arm 121 and is not displaced in the left-right direction. Further, the lower portion of the counter arm 115 is located on substantially the same vertical plane as the connection arm 118 and is not displaced in the left-right direction.

  In the scatter power transmission mechanism 111 configured as described above, when the crank 56 rotates, the input rod 112 moves up and down, and the two output rods 113 and 114 move back and forth. The intermediate drive shaft 97 that is interlocked and connected to the output rod 113 via the connection arm 118 and the first one-way clutch 119 rotates intermittently, and power is transmitted to the first spraying device 85. Further, the feeding drive shaft 105 that is interlocked and connected to the output rod 114 via the connection arm 121 and the second one-way clutch 122 rotates intermittently, and power is transmitted to the second spraying device 101.

  More specifically, when the input rod 112 moves upward, the counter arm 115 swings forward counterclockwise, the output rod 113 is pushed forward, and the output rod 114 is pulled forward. At this time, the connection arm 118 rotates counterclockwise, and the first one-way clutch 119 is rotated counterclockwise along with the connection arm 118 by the elastic force of the torsion coil spring in a disconnected state with the intermediate drive shaft 97. The On the other hand, when the connection arm 121 rotates counterclockwise, the second one-way clutch 122 is rotated counterclockwise against the elastic force of the torsion coil spring while being connected to the feeding drive shaft 105, and the feeding drive shaft 105 is rotated counterclockwise.

  Further, when the input rod 112 moves downward, the counter arm 115 swings backward in the clockwise direction, the output rod 113 is pulled backward, and the output rod 114 is pushed backward. At this time, the connecting arm 118 is rotated clockwise, and the first one-way clutch 119 is rotated clockwise against the elastic force of the torsion coil spring while being connected to the intermediate drive shaft 97, so that the intermediate drive shaft 97 is rotated. It is rotated clockwise. On the other hand, the connection arm 121 is rotated clockwise, and the second one-way clutch 122 is rotated clockwise along with the connection arm 121 by the elastic force of the torsion coil spring in a disconnected state with the feeding drive shaft 105.

  That is, the spreading power transmission mechanism 111 transmits power only to the second spreading device 101 when the input rod 112 moves upward, and the first spreading when the input rod 112 moves downward. It is configured to transmit power only to the device 85.

  Here, the spraying power transmission mechanism 111 has a simple configuration including three rods and one arm, and inputs one input from the planting unit 20 to the first spraying device 85 and the second spraying device 101. It can be distributed to two outputs and the productivity is good.

  In addition, the power transmission mechanism 111 can easily connect and disconnect the power from the planting unit 20 to the first spraying device 85 and the second spraying device 101. It is only necessary to disconnect and connect the three rods of the input rod 112 and the two output rods 113 and 114. For example, in order to disconnect the power to the first spreading device 85, disconnect the output rod 113. What is necessary is just to cut | disconnect the connection of the output rod 114, in order to cut | disconnect the motive power to the 2nd spreading | diffusion apparatus 101. Moreover, in order to cut | disconnect the motive power to the 1st spreading | diffusion apparatus 85 and the 2nd spreading | diffusion apparatus 101, the connection of the input rod 112 should just be cut | disconnected, and it can carry out easily with the quick joint 116.

  In addition, since the two output rods 113 and 114 extend symmetrically in the forward and backward directions, the dispersed power transmission mechanism 111 can perform balanced power transmission and reduce play and vibration.

  Further, the spreading power transmission mechanism 111 is configured to transmit power only to one of the power transmission systems of the first spreading device 85 or the second spreading device 101, that is, alternatively, the power is transmitted. It is possible to prevent the driving loads of the first spraying device 85 and the second spraying device 101 from being applied to the power transmission mechanism 111 at the same time, and the durability is improved, and the first spraying device 85 and the second spraying device 101 are It can be driven well.

  The two output rods 113 and 114 transmit power to the power transmission system of the first spraying device 85 or the second spraying device 101, respectively, when being pulled forward or backward by the counter arm 115, respectively. Therefore, since not the compressive force but the tensile force acts on the two output rods 113 and 114, the two output rods 113 and 114 are not easily deformed, and the durability is improved.

  Here, the first spreading device 85 is configured to drive the four feeding rolls 93 by the power from the spreading power transmission mechanism 111. On the other hand, the second spraying device 101 is configured to drive one feeding roll 106 by the power from the spraying power transmission mechanism 111. Therefore, the load applied to the spreading power transmission mechanism 111 is greater when power is transmitted to the first spreading device 85 than when power is transmitted to the second spreading device 101. The input rod 112 is pushed upward by the crank 56 when power is transmitted to the second spraying device 101, and is moved downward by the crank 56 when power is transmitted to the first spraying device 85. Be pulled. Therefore, the force acting on the input rod 112 is smaller in compressive force than tensile force, so that the input rod 112 is not easily deformed, and durability is improved.

  Here, the counter arm 115 has a mounting hole 125 to which the other end of the input rod 112, the other end of the two output rods 113 and 114, and the other end of another output rod can be connected. The distance from the swing shaft 124 that is the swing support shaft of the counter arm 115 to the mounting hole 125 is such that the swing shaft 124 that is the swing support shaft of the counter arm 115 and the other end of the input rod 112 and the two outputs. It is different from the distance to the other end of the rods 113 and 114. That is, the counter arm 115 is configured to be able to change the distance from the swing shaft 124 to the other end of the input rod 112 and the other ends of the two output rods 113 and 114. Therefore, the power distributed to the first spraying device 85 and the second spraying device 101 can be easily adjusted, and the power can also be distributed to other devices, which is convenient.

  Further, the input rod 112 is connected to the lower end of the counter arm 115 so that the length of the input rod 112 is shortened, so that the input rod 112 is not easily deformed, and durability is improved.

  Here, the power transmission system of the first spraying device 85 includes a first metering device (not shown) that changes the position of the contact arm 120 extending from the first one-way clutch 119 with respect to the edge of the connection arm 118. Is also disposed. Similarly, the power transmission system of the second spraying device 101 includes a second metering device (not shown) that changes the position of the contact arm 123 extending from the second one-way clutch 122 with respect to the edge of the connection arm 121. Also arranged. The first metering device can adjust the amount of rotation of the first one-way clutch 119 relative to the amount of rotation of the connection arm 118, and can adjust the power to the first spraying device 85. Further, the second metering device can adjust the rotation amount of the second one-way clutch 122 with respect to the rotation amount of the connection arm 121, and can adjust the power to the second spraying device 101. it can.

  The spreading power transmission mechanism 111 is not limited to the above-described configuration. The spreading power transmission mechanism 111 is freely swingable with an input rod 112 having one end connected to the power transmission system of the planting unit 20, and output rods 113 and 114 each having one end connected to the power transmission system of a plurality of devices. The other end of the input rod 112 and the other end of the plurality of output rods 113 and 114 may be connected to the counter arm 115. For example, the scattered power transmission mechanism 111 may be configured to distribute power to three power transmission systems. Further, the counter arm 115 may be configured such that the upper portion is not offset in the left-right direction with respect to the lower portion. Further, the counter arm 115 has a plurality of arms extending radially from the outer periphery of a cylindrical member that is swingably supported by the swing shaft 124, and the other ends of the input rod 112 and the output rods 113, 114 are connected to the respective arms. May be connected. In addition, it is preferable that the connection part with the other end of the input rod 112 or the output rod 113,114 is located on the same plane, and it becomes difficult to produce the twist at the time of rocking | fluctuation. Further, the counter arm 115 may have a plurality of mounting holes 125 or may be configured without the mounting holes 125. In addition, the above-described spread power transmission mechanism 111 is configured to intermittently transmit power using the first one-way clutch 119 and the second one-way clutch 122, but continuously transmits power using a crank or the like. It may be configured to do so.

  Next, the parallel link mechanism 126 that connects the first spraying device 85 and the second spraying device 101 as the second working part to the rear part of the planting part 20 as the first working part will be described. FIG. 14 is a schematic plan view showing an example of the parallel link mechanism 126, FIG. 15 is a schematic side view showing an example of the support part 134 of the support frame 133, and FIG. 16 is a tightening lock. 4 is a schematic side view illustrating an example of 140. FIG. In FIG. 14, the seedling mount 21, the first spraying device 85, and the second spraying device 101 are indicated by two-dot chain lines, and descriptions of the planting device 22, a mud-proof cover 138 described later, and the like are omitted. ing.

  The parallel link mechanism 126 is a parallel link mechanism having a shaft extending in the vertical direction as a support shaft, and has a cylindrical open frame 127 extending in the left-right direction, a square cylindrical base frame 128 extending in the left-right direction, and a square cylindrical shape. Have two link arms 129a and 129b having the same length. The open frame 127 has one end of the two link arms 129a and 129b, and the first spreading device 85 as the second working unit and the end on the side of the second spreading device 101 extend in the vertical direction. Are pivotally connected to each other as a support shaft. In the pedestal frame 128, the other ends of the two link arms 129a and 129b and the end on the side of the planting portion 20 as the first working portion can be rotated about a shaft extending in the vertical direction. Connected.

  The open frame 127 includes a rectangular tube-shaped front frame 130 extending in the left-right direction and a rectangular tube-shaped rear frame 131 extending in the left-right direction via three flat connecting frames 132a, 132b, 132c extending in the front-rear direction. Connected.

  And the open frame 127 is latched by the planting part 20 at the time of the driving | running | working including the time of seedling planting work. More specifically, the open frame 127 is locked to a support frame 133 or the like that is fixed to the planting transmission case 28. Support frames 133a, 133b, 133c, and 133d that extend upward from the upper surface are fixed to the four planting transmission cases 28a, 28b, 28c, and 28d, respectively. As shown in FIG. 15 and FIG. 16, the two support frames 133a and 133b located on the left side are provided with support portions 134 each having a rear portion of the upper end cut out in a substantially L shape inclined rearward in a side view. Have. A hard resin roller 135 is attached to the rear part on the lower side of the support part 134 so as to be rotatable about the left-right direction.

  A square cylindrical pedestal frame 128 is fixed over the two support frames 133c and 133d located on the right side. The right end portion of the pedestal frame 128 protrudes rearward, and has a support portion 134 similar to the support portion 134 included in the support frames 133a and 133b at the rear end portion. A hard resin roller 135 is attached to the rear part below the support part 134 formed at the right end of the pedestal frame 128, like the other support parts 134, so as to be rotatable about the horizontal direction. In addition, a restriction projection 170 that protrudes upward is formed at the right end of the base frame 128. When the link arm 129 is rotated, the restricting projection 170 is in contact with the link arm 129 and restricts the amount of rotation.

  The cylindrical open frame 127 is supported so as to be placed on the three support portions 134. At this time, the cylindrical open frame 127 comes into contact with two portions of the support portion 134 and the roller 135. The support frame 133a located on the leftmost side has a locking lock 137 that engages with an engagement flange 136 that protrudes upward from the open frame 127 and locks the open frame 127 to the support frame 133a. The locking lock 137 can lock the open frame 127 to the support portion 134 of the support frame 133a by the elastic force of a spring (not shown), and is a so-called patched lock. The locking lock 137 is also disposed at the right end of the pedestal frame 128.

  The locking lock 137 only needs to be able to lock the open frame 127 to the support portion 134 of the support frame 133a, and the configuration, arrangement, number, and the like are not limited. For example, the locking lock 137 may be configured such that the open frame 127 is locked to the support portion 134 simply by a hook or the like without using the elastic force of a spring.

  The open frame 127 includes a mud-proof cover 138 (see FIG. 10) that covers the top of the planting device 22, a grip portion 139 that is substantially gate-shaped in a plan view that protrudes rearward, and the open frame 127 that supports the open frame 133b. A tightening lock 140 to be engaged with each other, two coupling brackets 141a and 141b to which the link arm 129 is coupled, two shielding covers 142 and 142, and the like. The open frame 127 is also provided with a not-shown streak device for operating a streak clutch 52 disposed inside the planting transmission case 28.

  The mud-proof cover 138 blocks mud splashing upward when the planting device 22 is operated. As shown in FIG. 10, the mud-proof cover 138 is disposed above the planting device 22 and is opened via the bracket 143. Supported by a frame 127. The configuration and arrangement of the mud cover 138 are not particularly limited. For example, the mud cover 138 may be fixed to the support frame 133. However, from the viewpoint of maintainability of the planting device 22, it is preferable that the planting device 22 is attached to an open frame 127 or the like on the first spraying device 85 and the second spraying device 101 side as the second working unit.

  The grip portion 139 is gripped by an operator when the open frame 127 is moved back and forth, and is disposed near the left side of the center in the left-right direction of the open frame 127 and in the vicinity of the connection bracket 141a. . The configuration and arrangement of the grip portion 139 are not particularly limited. For example, the front frame 130 and the rear frame 131 connected to the open frame 127 may be provided. However, from the viewpoint of strength and operability, it is preferable to be disposed on the open frame 127, and in the vicinity of the connection bracket 141 to which one end of the link arm 129 is connected.

  The tightening lock 140 firmly locks the open frame 127 by the force in the front-rear direction and the up-down direction without rattling to the support frame 133b. The tightening lock 140 is disposed on the open frame 127 in the vicinity of the support frame 133b. The tightening lock 140 includes a cylindrical penetrating shaft 144 that penetrates the open frame 127 in the radial direction, a rod-shaped handle 145 that is connected to one end of the penetrating shaft 144, and a plate-like shape that is attached to the other end of the penetrating shaft 144. The urging plate 146, a guide plate 147 attached to the open frame 127, a contact portion 148 fixed to the open frame 127, and the like. The tightening lock 140 is engaged with the receiving portion 149 fixed to the support frame 133b to lock the open frame 127 to the support frame 133b.

  The cylindrical penetrating shaft 144 is inserted into a through hole that penetrates the open frame 127 in a radial direction inclined by approximately 45 degrees with respect to a horizontal plane in a side view, and is supported rotatably with respect to the open frame 127. . The columnar through-shaft 144 is in a state of being inclined approximately 45 degrees downward and forward in a side view. The rear end portion of the through shaft 144 is positioned above the open frame 127, and the handle 145 is connected thereto.

  The handle 145 has a grip 150 that is gripped by an operator at one end. The other end portion of the handle 145 is bifurcated in the left-right direction (front side and back side with respect to the paper surface in FIG. 16) so as to sandwich the rear end portion of the through shaft 144. The other end portion of the handle 145 is rotatably connected to the rear end portion of the through shaft 144 with a handle shaft 151 extending in the left-right direction (the radial direction of the through shaft 144) as a support shaft.

  Here, in a side view, the edge on the front side of the other end of the handle 145 is located on the one end side (the grip 150 of the grip 150) from the intersection P with the virtual line L1 that extends parallel to the through shaft 144 through the handle shaft 151. A contact surface 152 that extends linearly toward the side), a corner surface 153 that extends in an arc shape from the intersection P toward the opposite side of the one end, and the other end of the handle 145 that is connected to the corner surface 153 And a leading end surface 154. The contact surface 152 is orthogonal to the handle shaft 151 and the tip surface 154. The distance d3 between the handle shaft 151 and the corner surface 153 and the distance d4 between the handle shaft 151 and the tip surface 154 are smaller than the distance d5 between the handle shaft 151 and the contact surface 152.

  A threaded portion (not shown) is formed at the other end portion of the through shaft 144 and a part thereof is cut away. The urging plate 146 is a rectangular plate spring formed of spring steel and extending in the left-right direction (front side and back side with respect to the paper surface in FIG. 16). The biasing plate 146 has a through-hole (not shown) corresponding to the cross-sectional shape of the other end of the through-shaft 144 with a part cut away at the left end. The urging plate 146 is attached to the through shaft 144 while the other end portion of the through shaft 144 is inserted into the through hole and is sandwiched by two nuts. The through hole of the urging plate 146 corresponds to the cross-sectional shape of the other end portion of the through shaft 144 that is partially cut away, and the rotation of the urging plate 146 with respect to the through shaft 144 is restricted. .

  A guide plate 147 formed by bending a plate-like member is attached to the open frame 127. The guide plate 147 has a through hole (not shown) through which the through shaft 144 is inserted. The guide plate 147 has a flat guide portion 155 in which the through hole is formed and in close contact with the contact surface 152 of the handle 145. The guide part 155 is interposed between the open frame 127 and the handle 145.

  A contact portion 148 formed by bending a plate-like member in a substantially L shape in a side view has a vertical contact portion 156 extending in the vertical direction and a horizontal contact portion 157 extending in the horizontal direction. The contact portion 148 is fixed to the open frame 127. The vertical contact portion 156 of the contact portion 148 is located on the front side of the open frame 127, and the horizontal contact portion 157 is located on the lower side of the open frame 127. The contact portion 148 is located in the vicinity of the right side of the through shaft 144 (the back side with respect to the paper surface in FIG. 16).

  A receiving portion 149 formed by bending a plate-like member into a substantially U shape inclined rearward in a side view is fixed to the left side portion of the support frame 133b. The receiving portion 149 extends in the vertical direction, and the vertical abutting portion 156 of the abutting portion 148 closely contacts from behind, and the horizontal receiving portion 149 extends in the horizontal direction and the horizontal abutting portion 157 of the abutting portion 148 closely contacts from above. And a spring receiving portion 160 that extends in a direction orthogonal to the penetrating shaft 144 and abuts on the right end of the biasing plate 146 from below. The right end portion of the biasing plate 146 is in contact with the spring receiving portion 160 in a bent state.

  The tightening lock 140 configured as described above can lock the open frame 127 to the support frame 133b by the elastic force of the urging plate 146. Since the urging plate 146 is in a bent state, the right end is in contact with the spring receiving portion 160, so that the urging plate 146 is attached to the through shaft 144, the handle 145, the guide plate 147, and the open frame 127 to which the urging plate 146 is attached. The elastic force of the urging plate 146 acts. The direction of the elastic force of the urging plate 146 is the axial direction of the penetrating shaft 144 and is the direction from one end side to which the handle 145 is connected to the other end side to which the urging plate 146 is attached. Here, since the through-shaft 144 is inclined by approximately 45 degrees with respect to the horizontal plane, the elastic force of the biasing plate 146 is distributed substantially evenly in the front-rear direction and the vertical direction. The urging plate 146 is a leaf spring and can generate a large elastic force. The tightening lock 140 can adjust the elastic force of the urging plate 146 by changing the position of the urging plate 146 with respect to the through shaft 144 by two nuts sandwiching the urging plate 146. It is configured.

  That is, the vertical abutting portion 156 extending in the vertical direction of the abutting portion 148 fixed to the open frame 127 and the horizontal abutting portion 157 extending in the horizontal direction are each received by the receiving frame fixed to the support frame 133b with substantially the same force. The vertical receiving portion 158 extending in the vertical direction of the portion 149 and the horizontal receiving portion 159 extending in the horizontal direction are pressed against and closely contact each other. The back and forth rattling is prevented by the close contact between the vertical contact portion 156 and the vertical receiving portion 158 extending in the vertical direction. Further, the rattling in the vertical direction is prevented by the close contact between the horizontal contact portion 157 and the horizontal receiving portion 159 extending in the horizontal direction. Accordingly, the tightening lock 140 can firmly lock the open frame 127 with the force in the front-rear direction and the vertical direction without rattling the support frame 133b.

  Note that the lock of the open frame 127 by the tightening lock 140 is released by rotating the handle 145 backward (clockwise in FIG. 16) with the handle shaft 151 as a support shaft. Although explanation by illustration is omitted, the handle 145 is rotated 90 degrees counterclockwise with the handle shaft 151 as a support shaft, and the guide portion 155 of the guide plate 147 and the distal end surface 154 at the edge of the other end of the handle 145 are connected. Make them face each other. Since the distance d4 between the handle shaft 151 and the front end surface 154 is smaller than the distance d5 between the handle shaft 151 and the contact surface 152, the distance between the guide portion 155 of the guide plate 147 and the front end surface 154 of the handle 145 is small. A gap is created. The penetrating shaft 144 moves to the other end side to which the urging plate 146 is attached by the width of the gap, so that the urging plate 146 is not deflected and elastic force is lost.

  Next, the handle 145 is rotated leftward (front side in FIG. 16) or rightward (back side in FIG. 16) with the penetrating shaft 144 as a support shaft. At this time, the penetrating shaft 144 and the urging plate 146 also rotate together with the handle 145, and the urging plate 146 is removed from the spring receiving portion 160 of the receiving portion 149, so that the open frame 127 is locked by the tightening lock 140. Is released.

  The configuration of the tightening lock 140 is not limited to the above-described configuration as long as the open frame 127 is locked by force in the front-rear direction and the vertical direction. For example, a buffer is provided between the vertical contact portion 156 of the contact portion 148 and the vertical receiving portion 158 of the receiving portion 149 and between the horizontal contact portion 157 of the contact portion 148 and the horizontal receiving portion 159 of the receiving portion 149. A configuration in which a rubber sheet or the like as a member is interposed may be employed. With such a configuration, the rattling of the open frame 127 can be further reduced.

  As described above, the open frame 127 is supported by being placed on the support portions 134 formed on the support frame 133a, the support frame 133b, and the pedestal frame 128, and the right end portions of the support frame 133a and the pedestal frame 128 are supported. Are locked to a planting portion 20 as a first working portion by a locking lock 137 and a tightening lock 140 provided respectively.

  The connecting bracket 141a is disposed on the open frame 127 near the left side of the center in the left-right direction and in the vicinity of the support frame 133b. On the other hand, the connecting bracket 141b is disposed on the open frame 127 near the right side of the center in the left-right direction and in the vicinity of the support frame 133c. One end of each of the link arms 129a and 129b is connected to the connection brackets 141a and 141b so as to be rotatable about connection shafts 161a and 161a extending in the vertical direction. The connecting brackets 141a and 141b are composed of two substantially pentagonal plate-like members that are fixed to the upper and lower portions of the open frame 127 so as to sandwich the open frame 127 in plan view. The connecting brackets 141a and 141b are rotatably supported so as to sandwich one end of the link arms 129a and 129b. The other end of the link arms 129a and 129b is connected to the upper surface of the pedestal frame 128 so as to be rotatable about connecting shafts 162a and 162b extending in the vertical direction. The distance between the two connecting shafts 161a and 161b is equal to the distance between the two connecting shafts 162a and 162b, and the two link arms 129a and 129b are arranged in parallel in a plan view.

  In addition, a swinging shaft 124 that supports the counter arm 115 of the above-described scattering power transmission mechanism 111 so as to be swingable in the front-rear direction is fixed to the connection bracket 141a located in the vicinity of the support frame 133b. Therefore, when power is transmitted to the first spraying device 85 and the second spraying device 101 by the spraying power transmission mechanism 111, the open frame 127 vibrates because a periodic load is applied to the connecting bracket 141a. Cheap. Here, the open frame 127 is firmly locked to the support frame 133b by the tightening lock 140 in the vicinity of the connection bracket 141a, that is, in the vicinity of the swing shaft 124 that is a vibration generation source. Therefore, the vibration of the open frame 127 due to the operation of the scattered power transmission mechanism 111 can be suppressed.

  Further, as shown in FIG. 17, a link rotation lock 163 for restricting the rotation amount of the link arm 129a is disposed on the connection bracket 141a. Here, FIG. 17 is a schematic plan view showing an example of the link rotation lock 163, FIG. 17A shows a state before the rotation of the link arm 129a is restricted, and FIG. 17B shows the state of the link arm 129a. This is a state after the rotation is restricted. In FIG. 17, the link rotation lock 163 is mainly described, the description of the swing shaft 124, the connecting frame 132c, and the like is omitted, and the shielding cover 142 is described by a two-dot chain line.

  The link rotation lock 163 includes a locking pin 165 inserted into a holding hole 164 that is a circular through hole formed in the connection bracket 141a, a spring (not shown) that biases the locking pin 165 to the link arm 129a, and the like. Consists of The locking pin 165 is formed by bending a cylindrical member at a substantially right angle, and one end of the locking pin 165 is inserted into the holding hole 164. A flat lock flange 166 is fixed to the end of the link arm 129a. The locking pin 165 is biased so that one end inserted through the holding hole 164 by a spring comes into contact with the upper surface of the lock flange 166. The lock flange 166 has a locking hole 167 that is a circular through hole. The diameter of the locking hole 167 is larger than the diameter of the locking pin 165. The locking hole 167 is arranged so that the center thereof coincides with the center of the holding hole 164 when the link arm 129a rotates about the connecting shaft 161a until the link arm 129a is orthogonal to the open frame 127 in plan view. ing.

  In the link rotation lock 163 having the above-described configuration, when the link arm 129a is rotated about the connecting shaft 162a until the link arm 129a is orthogonal to the open frame 127 in plan view, the locking pin 165 is locked to the locking hole 167. And the rotation of the link arm 129a is restricted. The position of the locking hole 167 is appropriately set according to the amount of rotation that regulates the link arm 129a. The link rotation lock 163 only needs to be configured to restrict the amount of rotation of the link arm 129a, and is not limited to the above-described configuration. For example, the lock flange 166 may have a plurality of locking holes 167. With such a configuration, the rotation of the link arm 129a can be restricted in a plurality of stages, and the usability is good.

  In the vicinity of the connection brackets 141a and 141b of the open frame 127, shielding covers 142 and 142 are attached to cover the gap between the open frame 127 and the link arm 129 from above. The shielding cover 142 prevents exposure near the connecting portion between the open frame 127 and the link arm 129, and prevents the operator from touching carelessly.

  The front frame 130 is parallel to the open frame 127 and is disposed in front of and above the open frame 127. Four mounting flanges 168 corresponding to the four spraying units 86 of the first spraying device 85 are formed on the upper surface of the front frame 130 (see FIG. 11). And the spreading | diffusion unit 86 is each attached to the attachment flange 168 so that attachment or detachment is possible. In addition, two gear cases 96 of the first spreading device 85 are also attached to the upper surface of the open frame 127. Therefore, the first spraying device 85 is supported by the front frame 130. In addition, the front frame 130 should just be the structure which supports the 1st spreading | diffusion apparatus 85, and is not limited to the above-mentioned structure.

  The rear frame 131 is parallel to the open frame 127 and is disposed behind the open frame 127. A plurality of attachment plates 169 extending rearward are fixed to the upper surface of the rear frame 131. Then, the second spraying device 101 is attached to the attachment plate 169. More specifically, the spreading cover 104 of the second spreading device 101 is attached to the mounting plate 169 (see FIG. 10). Therefore, the second spreading device 101 is supported by the rear frame 131. The rear frame 131 may be configured to support the second spraying device 101 and is not limited to the above configuration.

  The two connection frames 132a and 132b extend forward, upward, and rearward from the open frame 127, the front end is fixed to the front frame 130, and the rear end is fixed to the rear frame 131. The connection frame 132a is located between the support frames 133a and 133b in a plan view, and the connection frame 132b is located between the support frames 133c and 133d in a plan view. The connecting frame 132c extends rearward from the open frame 127, and the rear end is fixed to the rear frame 131. The connection frame 132c is located in the vicinity of the connection bracket 141a in plan view. The open frame 127, the front frame 130, and the rear frame 131 are connected by three connection frames 132a, 132b, and 132c. Therefore, the 1st spreading | diffusion apparatus 85 and the 2nd spreading | diffusion apparatus 101 as a 2nd working part are the rear parts of the planting part 20 as a 1st working part, Comprising: The planting transmission case of the planting frame 26 The support frame 133 fixed to 28 is integrally attached via a parallel link mechanism 126.

  The connecting frame 132 only needs to connect the open frame 127, the front frame 130, and the rear frame 131, and the configuration, arrangement, number, and the like are not limited. For example, the connection frame 132c is disposed between the support frames 133b and 133c in a plan view, and extends forward, upward, and rearward from the open frame 127, and the tip is fixed to the front frame 130, similarly to the connection frames 132a and 132b. The rear end may be fixed to the rear frame 131. Further, the connection frames 132a and 132b may be configured such that the side connected to the front frame 130 and the side connected to the rear frame 131 are formed by different members.

  As shown in FIGS. 18 and 19, the parallel link mechanism 126 configured as described above uses the first spraying device 85 and the second spraying device 101 as the second working unit as the first working unit. Can be moved horizontally from the planting part 20 to the rear. Here, FIG. 18 is a schematic plan view showing an example of a state in which the first spraying device 85 and the second spraying device 101 are moved rearward, and FIG. 19 shows the first spraying device 85 and It is the schematic side view by which an example of the state which moved the 2nd spreading | diffusion apparatus 101 back was shown. In FIG. 18, the seedling mount 21, the first spraying device 85, the second spraying device 101, and the shielding cover 142 are indicated by a two-dot chain line, and descriptions of the planting device 22, the mudproof cover 138, and the like are shown. It is omitted. Moreover, in FIG. 19, the planting apparatus 22 is shown with the dashed-two dotted line.

  In order to move the first spraying device 85 and the second spraying device 101 backward from the planting unit 20 as the first working unit, first, the first spraying device 85 and the second spraying unit 85 are moved from the planting unit 20. The power transmission system to the spreading device 101 is disconnected. The protective cover 117 attached to the rear end portion of the planting transmission case 28b is pivoted downward to open the spray output shaft 55, the quick joint 116, the crank 56, one end portion of the input rod 112, and the like. The quick joint 116 separates the input rod 112 side of the spray output shaft 55 from the power transmission shaft 50 side.

  Next, the locking of the open frame 127 by the locking lock 137 provided on the support frame 133a, the locking lock 137 provided on the right end of the pedestal frame 128, and the tightening lock 140 is released. Then, by grasping the grip portion 139 and pulling the open frame 127 backward, the open frame 127 is pulled out from the support portions 134 formed on the support frame 133a, the support frame 133b, and the pedestal frame 128, respectively. Move to. At this time, devices connected to and supported by the open frame 127, such as the first spraying device 85, the second spraying device 101, the spraying power transmission mechanism 111, the mud cover 138, and the like, also move backward together with the open frame 127. Is done.

  Then, the locking pin 165 of the link rotation lock 163 is inserted into the locking hole 167 and the movement of the open frame 127 is stopped by restricting the rotation of the link arm 129a. The link arm 129b comes into contact with a restriction projection 170 formed at the right end of the pedestal frame 128.

  As described above, the open frame 127 attached to the planting unit 20 via the parallel link mechanism 126 can be moved rearward. That is, the 1st spreading | diffusion apparatus 85 and the 2nd spreading | diffusion apparatus 101 as a 2nd working part can be spaced apart back from the planting part 20 as a 1st working part, and the rear part of the planting part 20 In particular, the accessibility to the seedling stage 21 and the planting device 22 is improved. Therefore, maintenance of the rear part of the planting unit 20, for example, removal of the seedling mat 98 remaining on the seedling stage 21 and lifting upward, maintenance of the seedling stage 21, folding work of the seedling stage 21, and planting device 22 Maintenance can be easily performed.

  Further, since the open frame 127 moves horizontally, the operator does not need to move the open frame 127 while supporting or lifting the open frame 127 from below, and the first spraying device can be easily and with little labor. 85 and the second spraying device 101 can be moved, and the burden on the operator is small.

  Further, the open frame 127 does not rotate around the axis extending in the vertical direction with respect to the planting unit 20 and is moved while maintaining a state parallel to the planting unit 20. And the 2nd spraying apparatus 101 does not move back more than the space spaced apart from the planting part 20 back. Therefore, the first spraying device 85 and the second spraying device 101 can be separated rearward from the planting unit 20 without requiring a large space on the rear side, and the space in a warehouse, for example, is limited. Even under such circumstances, the rear portion of the planting unit 20 can be easily maintained.

  Moreover, the parallel link mechanism 126 connects the open frame 127 which supports the 1st spreading | diffusion apparatus 85 or the 2nd spreading | diffusion apparatus 101 to the base frame 128 attached to the planting part 20 by two link arms 129a and 129b. It is. Therefore, the parallel link mechanism 126 does not concentrate the weight of the first spraying device 85, the second spraying device 101, etc. in one place, and has good durability.

  Further, the parallel link mechanism 126 is provided at the right rear portion of the planting unit 20. More specifically, the ends of the two link arms 129a and 129b on the side of the planting portion 20 are turned to the base frame 128 attached to the planting transmission cases 28c and 28d located on the right side via the support frames 133c and 133d. It is linked movably. That is, when the first spraying device 85 and the second spraying device 101 are separated rearward from the planting unit 20, the two link arms 129 a and 129 b are located on the right side of the planting unit 20. Therefore, when performing the maintenance of the rear part of the planting part 20, the parallel link mechanism 126 (link arms 129a and 129b) is not easily disturbed, and the maintenance can be easily performed. For example, the rear portion of the planting unit 20 can be maintained without moving to the left and right while avoiding the parallel link mechanism 126 (link arms 129a and 129b).

  Moreover, since the mud-proof cover 138 which covers the upper part of the planting apparatus 22 is supported by the open frame 127 via the bracket 143, it is spaced apart from the planting part 20 with the open frame 127 back. Therefore, since the upper part of the planting apparatus 22 is released, the maintenance of the planting apparatus 22 can be performed easily.

  In the parallel link mechanism 126, the rotation amount of the link arm 129a is restricted by the link rotation lock 163. Therefore, the 1st spreading | diffusion apparatus 85 and the 2nd spreading | diffusion apparatus 101 can be stopped in a desired position, and it is convenient. In addition, it is possible to reliably prevent the link arm 129b from being excessively rotated by the restriction projection 170, and the first and second spraying devices 85 and 85 attached to the parallel link mechanism 126 and the parallel link mechanism 126. 101 or the like can be prevented from being damaged.

  Further, the protective cover 117 that covers one end of the spray output shaft 55, the quick joint 116, the crank 56, and the input rod 112 is made of resin, and the lower part thereof rotates around the planting transmission case 28b about the left-right direction. Since it is supported freely, it is possible to prevent the input rod 112 from being damaged due to the unseparated distribution output shaft 55. Specifically, when the operator moves the open frame 127 rearward by the quick joint 116 without separating the input rod 112 side of the spray output shaft 55 from the power transmission shaft 50 side, the input rod 112 is protected. It abuts on the upper part of the cover 117. However, since the protective cover 117 is made of resin, the input rod 112 is prevented from being damaged. Further, when the input rod 112 abuts on the upper part of the protective cover 117, the engaging portion of the planting transmission case 28b and the locking projection of the protective cover 117 are disengaged, and the protective cover 117 rotates to plant. The rear end of the transmission case 28b is exposed. By exposing the rear end of the planting transmission case 28b, the operator can be alerted and the input rod 112 can be prevented from being damaged by the further movement of the open frame 127.

  In addition, in order to return the 1st spreading | diffusion apparatus 85 and the 2nd spreading | diffusion apparatus 101 to the position of the use state before back movement, it performs by the reverse procedure to the time of the above-mentioned back movement. The locking pin 165 of the link rotation lock 163 is pulled out from the locking hole 167, and the open frame 127 is pushed forward. Then, the open frame 127 is fitted into the support portions 134 formed on the support frame 133a, the support frame 133b, and the pedestal frame 128, respectively. The open frame 127 bends slightly downward due to its own weight or the weight of the first spraying device 85 and the second spraying device 101, so it is necessary to fit the open frame 127 into the support portion 134 so as to lift the open frame 127. Here, a roller 135 that is rotatably supported is attached to a rear portion on the lower side of each support portion 134. Therefore, the open frame 127 can be moved on the roller 135 and fitted into the support portion 134, thereby reducing the burden on the operator.

  Next, the open frame 127 is locked by the locking lock 137 provided on the support frame 133 a, the locking lock 137 provided on the right end of the pedestal frame 128, and the tightening lock 140. The quick joint 116 connects the input rod 112 side of the spraying output shaft 55 to the power transmission shaft 50 side, and closes the protective cover 117 by rotating it upward.

  The parallel link mechanism 126 is not limited to the above configuration. The parallel link mechanism 126 is a parallel link mechanism having a shaft extending in the vertical direction as a support shaft, and the first spraying device 85 and the second spraying device 101 can be moved in the front-rear direction at the rear portion of the planting unit 20. Any configuration may be used. For example, the parallel link mechanism 126 may be a parallel link mechanism including three link arms 129, or may be configured to include a reinforcing arm that connects the link arms 129a and 129b.

  Moreover, the edge part by the side of the planting part 20 of the parallel link mechanism 126 should just be attached to the planting frame 26, for example, the structure by which the support frame 133 is fixed to the main frame 27 may be sufficient. However, from the viewpoint of productivity, the support frame 133 is preferably fixed to the planting transmission case 28, and the parallel link mechanism 126 can be arranged with a simple configuration.

  Further, the parallel link mechanism 126 may be provided at the center or the left side of the rear portion of the planting unit 20. For example, the above-described parallel link mechanism 126 may have a symmetrical configuration, and the same effect can be obtained. In addition, it is preferable to provide the parallel link mechanism 126 in any one rear part of the planting part 20 in the left-right direction. When the rear part of the planting part 20 is maintained, the parallel link mechanism 126 (link arms 129a and 129b) is not easily disturbed, and the maintenance can be easily performed. Moreover, when either one of the left-right direction of the seedling mounting base 21 is comprised so that folding is possible, it is preferable to provide the parallel link mechanism 126 on the opposite side to the unit seedling mounting base 25 to fold. With such a configuration, the seedling stage 21 can be easily folded.

  Further, the parallel link mechanism 126 may be configured such that the two link arms 129a and 129b extend and contract as a unit. With such a configuration, the left and right sides of the first spraying device 85 and the second spraying device 101 when the first spraying device 85 and the second spraying device 101 are separated rearward from the planting unit 20. The amount of movement in the direction can be reduced, and the rear part of the planting part 20 can be easily maintained even in a narrow space.

  In addition, it is preferable that arrangement | positioning of each member and various apparatuses in the parallel link mechanism 126 is based on the connection shaft 162b located in the outward side of the left-right direction. By using the connecting shaft 162b as a reference, the number of parts that can be shared is increased and the cost can be reduced in the planting parts having different numbers of planting lines, for example, the planting parts of the 8-row planting type and the 6-row planting type.

  As described above, in the present embodiment, the traveling machine body 2, the planting unit 20 as the first working unit connected to the rear part of the traveling machine body 2, and the second working unit attached to the planting unit 20 The first spraying device 85 and the second spraying device 101, and the first spraying device 85 and the second spraying device 101 are connected to the rear portion of the planting part 20 in a vertical direction connecting shaft 161 a, Since it is attached so as to be movable in the front-rear direction via a parallel link mechanism 126 having 161b, 162a, 162b as support shafts, it is attached to the rear part of the planting part 20 with an easy operation without requiring a large space behind. The 1 rice spraying device 85 and the 2nd spraying device 101 can be spaced apart from the planting part 20, and the rice transplanter 1 with favorable durability can be provided. And even if it is a small space, the maintenance of the planting part 20 can be performed easily.

  In addition, the 2nd working part in this embodiment should just be attached to the planting part 20 as a 1st working part, and is limited to the above-mentioned 1st spraying apparatus 85 and the 2nd spraying apparatus 101. Is not to be done. For example, the second working unit may be either the first spraying device 85 or the second spraying device 101.

  The work vehicle of the present invention is not limited to the rice transplanter 1 including the planting part 20 connected to the rear part of the traveling machine body 2 and the spraying devices 85 and 101 attached to the planting part 20, for example, a tractor A work device connected to the rear part of the traveling machine body, such as a work vehicle including a rotary tiller connected to the rear and a spraying device attached to the rotary tiller, and another work attached to the work It can apply to all the work vehicles provided with.

1 Rice transplanter (work vehicle)
2 traveling machine body 20 planting part (first working part)
21 Seedling stand 22 Planting device 26 Planting frame 27 Main frame 28 Planting transmission case 85 First spraying device (second working unit)
98 Seedling mat 101 Second spraying device (second working part)
126 Parallel link mechanism 161, 162 Connecting shaft

Claims (4)

Traveling aircraft,
A first working unit coupled to a rear portion of the traveling machine body;
A second working part attached to the first working part;
With
The second working part is attached to the rear part of the first working part so as to be movable in the front-rear direction through a parallel link mechanism having a shaft extending in the vertical direction as a support shaft.
Work vehicle. The parallel link mechanism is provided at a rear portion in any one of left and right directions of the first working unit.
The work vehicle according to claim 1. The first working unit includes a seedling platform on which a seedling mat is placed, a plurality of planting devices for planting seedlings in a field, a planting frame that supports the seedling platform and the planting device, A planting part comprising
The second working unit is a spraying device that sprays a medicine on the seedling mat or a field placed on the seedling platform,
An end on the first working part side of the parallel link mechanism is attached to the planting frame,
The work vehicle according to claim 1 or claim 2. The planting frame has a main frame extending in the left-right direction, and a plurality of planting transmission cases extending rearward from the main frame and having the planting device disposed at a rear end portion thereof,
An end of the parallel link mechanism on the first working part side is attached to the planting transmission case,
The work vehicle according to claim 3.

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