JP2019076043A - Riding type chemical spreader - Google Patents

Abstract

To stably support a nozzle support frame in a machine body in a freely rolling manner in a riding type chemical spreader.SOLUTION: A riding type chemical spreader includes a nozzle support frame 8 for supporting a spraying nozzle for spraying chemicals on a field, and a rolling mechanism 36 for supporting the nozzle support frame 8 in supporting units 30, 31, 32 of a machine body in a freely rolling manner. The riding type chemical spreader includes a front/rear displacement prevention part 37 for preventing the longitudinal displacement of the nozzle support frame 8, while integrally rolling with the nozzle support frame 8. The front/rear displacement prevention part 37 is connected to the nozzle support frame 8 through a connecting member 35 and supported in a position separated from the nozzle support frame 8.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a passenger type drug sprayer that sprays a drug such as a herbicide while traveling on a field.

An example of a passenger type drug spreader is disclosed in Patent Document 1.
In Patent Document 1, the nozzle support frame is supported by the airframe and extended in the left-right direction, and a large number of spray nozzles that spray the medicine in the field are supported by the nozzle support frame. As the airframe travels, the medicine is sprayed from the spray nozzle over a wide range of fields.
In this case, there is one in which the nozzle support frame is supported by the airframe in a freely rolling manner, and the nozzle support frame is made less susceptible to the influence of the vibration of the airframe during traveling and the change in posture.

Unexamined-Japanese-Patent No. 2004-313883

  In the passenger type drug spreader as disclosed in Patent Document 1, the nozzle support frame is extended in the left and right direction, and the lateral width of the nozzle support frame is sufficiently large with respect to the lateral width of the airframe. There is room for improvement in terms of stably and rollably supporting the support frame on the airframe.

An object of the present invention is to configure a nozzle support frame so that it can be stably and rollably supported on an airframe in a passenger type drug spreader.

The passenger type drug spreader of the present invention is
A nozzle support frame extended in the left and right direction and supporting a spray nozzle for spraying the drug in the field;
A rolling mechanism for rollingly supporting the nozzle support frame on a support of the airframe;
A longitudinal displacement preventing portion configured to prevent longitudinal displacement of the nozzle support frame while rolling integrally with the nozzle support frame;
The front and rear displacement preventing portion is connected to the nozzle support frame via a connection member and supported at a position separated from the nozzle support frame.

  In the type drug sprayer for riding, when the nozzle support frame is supported rollably on the support portion of the airframe when the lateral width of the nozzle support frame is large, the nozzle support frame in the front-rear direction with respect to the support portion of the airframe There is a concern about displacement.

According to the present invention, since the longitudinal displacement preventing portion for preventing the longitudinal displacement of the nozzle support frame while rolling integrally with the nozzle support frame is provided, the longitudinal displacement of the nozzle support frame is prevented, and the nozzle The support frame is stably and rollably supported by the support portion of the airframe.
As a result, the nozzle support frame can be stably and rollably supported on the support portion of the airframe, which is advantageous in terms of stabilization of drug dispersion while traveling in the field.

When the front and rear displacement preventing portion is provided, according to the present invention, the front and rear displacement preventing portion is connected to the nozzle support frame via the connection member and supported at a position away from the nozzle support frame.
As a result, the function of the nozzle support frame for supporting the spray nozzle and the function of the front-back displacement preventing unit for preventing the displacement of the nozzle support frame in the front-rear direction can be clearly divided from each other. The respective functions described above can be sufficiently exhibited in the front-rear displacement preventing portion.

  For example, when the front and back displacement prevention portion is provided to be in direct contact with the nozzle support frame, if the front and back displacement prevention portion is damaged, the damage is likely to also reach the nozzle support frame. It may be difficult to continue.

  On the other hand, according to the present invention, since the front and back displacement preventing portion is supported at a position separated from the nozzle support frame, even if the front and back displacement preventing portion is damaged, the damage may extend to the nozzle support frame It is low and it is unlikely that it will be difficult to continue the work after this.

In the present invention,
An arm portion connected to the nozzle support frame and extending in the vertical direction from the nozzle support frame;
By contacting the arm portion from the front and rear direction, rotational displacement prevention is provided to prevent the displacement of the nozzle support frame around the axial center along the longitudinal direction of the nozzle support frame while allowing the rolling of the nozzle support frame It is preferable that a part is provided.

  In addition to the nozzle support frame being displaced in the front-rear direction with respect to the support portion of the machine body, when the nozzle support frame is supported rollably on the support portion of the machine body if the lateral width of the nozzle support frame is large. There is a concern that the nozzle support frame may be rotationally displaced about an axial center along the longitudinal direction of the nozzle support frame.

According to the present invention, when the rotation preventing portion contacts the arm portion extended in the vertical direction from the nozzle support frame, the above-mentioned displacement such that the nozzle support frame rotates while the rolling of the nozzle support frame is permitted. Is prevented.
As a result, the nozzle support frame can be stably and rollably supported on the support portion of the airframe, which is advantageous in terms of stabilization of drug dispersion while traveling in the field.

In the present invention,
The arm portion extends upward from the nozzle support frame in a front view,
It is preferable that the rotational displacement preventing portion is disposed on the upper side of the nozzle support frame in a front view.

  According to the present invention, the arm portion and the rotational displacement preventing portion are disposed on the upper side of the nozzle support frame in a front view, so for example, when traveling on a field in a crop grown state, the arm portion and the rotational displacement preventing portion There is no risk of crop damage if it comes in contact with the crop.

In the present invention,
The support is provided at the front of the airframe,
It is preferable that the front and rear displacement preventing portion be disposed on the rear side of the nozzle support frame in a plan view.

In a passenger type drug spreader, there is one in which a nozzle support frame is supported rollably at a support portion at the front of the airframe.
According to the present invention, since the front and rear displacement preventing portion is disposed on the rear side of the nozzle support frame in plan view, the front and rear displacement preventing portion does not come out on the front side of the nozzle support frame in plan view. Is advantageous in terms of reducing the overall length of the

In the present invention,
The nozzle support frame is rollably supported on the front portion of the support by the rolling mechanism,
It is preferable that the front-rear displacement preventing portion be disposed on the rear side of the support portion in a plan view.

  According to the present invention, the front and rear displacement preventing portion does not come out in front of the nozzle support frame and the support portion of the airframe in plan view, which is advantageous in terms of suppressing the entire front and rear length of the passenger type drug spreader.

  In this case, the support portion of the airframe is disposed between the nozzle support frame and the front-rear displacement prevention portion in plan view in a state where the front-rear displacement prevention portion is supported at a position separated rearward from the nozzle support frame. There is an advantage in terms of overall compactness.

In the present invention,
It is preferable that the rolling mechanism is disposed between the nozzle support frame and the support in a plan view.

  According to the present invention, the support portion of the airframe and the rolling mechanism are disposed between the nozzle support frame and the longitudinal displacement preventive portion in plan view in a state where the longitudinal displacement preventive portion is supported at a position separated rearwardly from the nozzle support frame. It is advantageous in terms of overall compactness.

In the present invention,
It is preferable that the front and rear displacement preventing portion be disposed at a position higher than the nozzle support frame in a front view.

  In addition to the nozzle support frame being displaced in the front-rear direction with respect to the support portion of the machine body, when the nozzle support frame is supported rollably on the support portion of the machine body if the lateral width of the nozzle support frame is large. There is a concern that the nozzle support frame may be rotationally displaced about an axial center along the longitudinal direction of the nozzle support frame.

According to the present invention, since the front and back displacement preventing portion is disposed at a position higher than the nozzle support frame in a front view, when the nozzle support frame is displaced to rotate as described above, this displacement becomes the front and back displacement preventing portion. It is applied as displacement in the front-rear direction, and the front-rear displacement preventing portion prevents the rotational displacement of the nozzle support frame.
As a result, the nozzle support frame can be stably and rollably supported on the support portion of the airframe, which is advantageous in terms of stabilization of drug dispersion while traveling in the field.

  According to the present invention, since the front and back displacement preventing portion is disposed at a position higher than the nozzle support frame in a front view, for example, when traveling on a field in a crop grown state, the front and back displacement preventing portion contacts the crop There is no risk that the crop will be damaged.

In the present invention,
The rolling mechanism is
There are provided right and left link members which are swingably supported around a first axial center of the supporting portion in the front-rear direction and extend downward from the first axial center,
The nozzle support frame is swingably connected around a second axial core in the front-rear direction of the lower part of the link member,
The distance between the right and left first axis and the distance between the right and left second axis are set to different values,
It is preferable that the front and rear displacement preventing portion and the link member are disposed so as to overlap in a front view.

According to the present invention, the rolling mechanism is provided with right and left link members, and the right and left link members swing left and right around the first axis center, thereby causing the nozzle support frame to swing left and right. While rolling.
In the rolling mechanism, since the right and left link members are disposed apart in the left-right direction, the nozzle support frame can be stably rolled on the support portion of the airframe even if the width of the nozzle support frame is large. It is advantageous in terms of the stabilization of drug dispersion while traveling in the field.

  According to the present invention, the front and rear displacement preventing portion and the link member are disposed so as to overlap in a front view. As a result, the front and back displacement preventing portion and the link member do not become largely separated from each other in the vertical direction, which is advantageous in terms of overall compactness.

In the present invention,
It is preferable that the nozzle support frame is swingably connected around the second axis of the link member by the connection member being swingably connected around the second axis of the link member. It is.

  According to the present invention, when the rolling mechanism includes the right and left link members, the connection member is pivotally connected around the second axis of the link member, and the connection member is the link member and the nozzle support frame. Since it is also used as the connection member of the above, it is advantageous in terms of simplification of the structure.

In the present invention,
It is preferable that a stopper that sets the rolling limit position of the nozzle support frame by contacting the front-rear displacement preventing unit is provided.

In the case of providing the stopper portion for setting the rolling limit position to the rollable nozzle support frame, according to the present invention, the front and back displacement preventing portion rolling integrally with the nozzle support frame abuts the stopper portion. The rolling limit position of is set.
As a result, the function of setting the rolling limit position of the nozzle support frame is also provided to the front and rear displacement preventing portion, which is advantageous in terms of simplification of the structure.

  For example, if the rolling nozzle support frame is configured to directly hit the stopper portion, the nozzle support frame may be damaged if the nozzle support frame hits the stopper portion, making it difficult to continue the work thereafter. Can be

  On the other hand, according to the present invention, since the front and back displacement preventing portion is supported at a position separated from the nozzle support frame, even if the front and back displacement preventing portion is damaged by the stopper portion, the damage extends to the nozzle support frame The possibility is low, and it is unlikely that it will be difficult to continue the work after this.

In the present invention,
It is preferable that a locking mechanism which can fix and release the nozzle support frame at a predetermined position in the rolling range of the nozzle support frame is provided in the front-rear displacement preventing portion.

  For example, the nozzle support frame may be fixed at a predetermined position in the rolling range of the nozzle support frame, such as when moving after completion of the operation or when storing in a barn or the like.

According to the present invention, in the case where the nozzle support frame is provided with a lock mechanism that can be fixed and released releasably, the lock mechanism is provided in the front / rear displacement prevention portion.
As a result, when the lock mechanism is operated in a fixed state, a large force acting to roll the nozzle support frame acts to damage the lock mechanism. Damage is unlikely to reach the nozzle support frame, and subsequent work is unlikely to be difficult.

In the present invention,
The nozzle support frame includes a central portion, a right portion and a left portion, and the central portion is rollably supported on the support via the rolling mechanism.
The cross section of the central portion is formed in a rectangular shape, and the central portion is supported such that a diagonal of the rectangular shape of the cross section is along the vertical direction and the longitudinal direction,
Of the upper two sides and lower two sides of the rectangular cross section of the central portion, one upper side and one lower side facing the upper side The pivot axis is set over the
The right portion is switchable between a working posture extending in the left and right direction around the swing axis of the right end portion of the central portion and a storage posture disposed along the front and rear direction on the right lateral side of the machine body Supported
The left portion is switchable between a working posture extending in the left and right direction around the swing axis of the left end portion of the central portion and a storage posture disposed along the front and rear direction on the left lateral side of the machine body It is preferred that it is supported.

In a passenger type drug dispenser, the nozzle support frame may be divided into a central portion, a right portion and a left portion, and the central portion of the nozzle support frame may be supported by the support portion of the airframe.
With this configuration, the working posture extends in the left and right direction around the swing axis of the right end (left) of the nozzle support frame and the right end (left) of the center portion of the nozzle support frame; It is switchably supported in the storage posture disposed along the front-rear direction on the right lateral side (left lateral side) of the airframe.
In this case, when the right portion (left portion) of the nozzle support frame is operated to the storage posture, it is preferable that the right portion (left portion) of the nozzle support frame is not horizontal but obliquely upward.

According to the present invention, as the central portion of the nozzle support frame, a member having a rectangular cross section is used, and the swing axis is set across the mutually opposing sides in the rectangular cross section of the central portion, The central portion is supported so that the rectangular diagonal of the cross section of the central portion is along the vertical direction and the front-rear direction.
As a result, the rocking shaft core can be set to a diagonal posture without difficulty, and in the storage posture, a state in which the right portion (left portion) of the nozzle support frame is diagonally upward can be obtained without difficulty.

It is a side view of a riding type drug spreader. It is a top view of a riding type drug spreader. It is a front view of a riding type drug spreader. It is the perspective view which looked at the front part of the body, the raising / lowering link mechanism, the rolling mechanism, and the vicinity of the nozzle support frame from the front side. FIG. 5 is a longitudinal side view in the vicinity of the front of the airframe, the elevation link mechanism, the rolling mechanism and the nozzle support frame. It is the perspective view which looked at the front part of the raising / lowering link mechanism, the rolling mechanism, and the vicinity of the rotational displacement prevention part from the front side. It is the perspective view which looked at the front part of a raising / lowering link mechanism, the back-and-front displacement prevention part, and the vicinity of a locking mechanism from the rear side. It is the disassembled perspective view which looked at the front part of the raising / lowering link mechanism, the rolling mechanism, the rotational displacement prevention part, the back-and-front displacement prevention part, and the vicinity of the locking mechanism from the front side. It is a front view near the front part of a raising / lowering link mechanism, a rolling mechanism, and a rotational displacement prevention part. It is a longitudinal cross-sectional side view of the front part of a raising / lowering link mechanism, a rolling mechanism, a rotational displacement prevention part, the back-and-front displacement prevention part, and the locking mechanism. It is a rear view of the front part of a raising / lowering link mechanism, a rolling mechanism, the back-and-front displacement prevention part, and the vicinity of a locking mechanism. It is the bottom view which looked at the front part of a raising / lowering link mechanism, a rolling mechanism, the back-and-front displacement prevention part, and the vicinity of a locking mechanism from the lower side. It is a top view near the right support part and the storage support part of the right. It is a vertical side view in the vicinity of a right support part and a right storage support part. It is a disassembled perspective view of the vicinity of the right support part and the right storage support part. It is a vertical side view of the center part of a nozzle support frame. FIG. 7 is a plan view of the vicinity of the central portion and the right portion of the nozzle support frame. FIG. 5 is a side view of the vicinity of the central portion and the right portion of the nozzle support frame. FIG. 10 is a plan view of the vicinity of a center portion and a right portion of the nozzle support frame showing a state in which the right portion of the nozzle support frame is operated to the working posture and the storage posture.

A passenger type drug spreader is shown in FIGS.
In FIG. 1 to FIG. 19, F indicates “forward”, B indicates “rearward”, U indicates “upward”, and D indicates “downward”. R indicates "rightward" and L indicates "leftward".

(Overall configuration of passenger type drug spreader)
As shown in FIGS. 1, 2 and 3, the airframe 3 is supported by the right and left front wheels 1 and the right and left rear wheels 2, and the drug tank 4 is supported at the center of the airframe 3. An engine 5 is supported at the rear and an operating unit 6 is supported at the front of the fuselage 3.

  A lifting link mechanism 7 is vertically swingably supported at the front of the machine body 3 and extends forward. The nozzle support frame 8 is supported at the front of the elevating link mechanism 7 and extends in the left-right direction, and a number of spray nozzles 9 are supported by the nozzle support frame 8.

  The pump 10 is supported at the rear of the fuselage 3, and the pump 5 is driven by the engine 5. The drug stored in the drug tank 4 is supplied from the pump 10 to the spray nozzle 9 and the drug is sprayed from the spray nozzle 9 to the field.

(Structure near the driving unit)
As shown in FIGS. 1 to 4, an airframe frame 11 is disposed at the front of the airframe 3 along the front-rear direction, and an airframe 12 is connected to the front of the airframe 11 along the left-right direction. ing.

  The floor 13 of the driving unit 6 is connected to the airframe frame 11, the steering post 14 is supported by the airframe frame 12, and the protective plate 24 is connected to the lower portion of the front of the steering post 14 along the left-right direction. ing. A steering handle 15 for steering operation of the front wheel 1 and the rear wheel 2 is supported on the top of the steering post 14, and a driver's seat 16 is supported on the front of the medicine tank 4.

  As shown in FIGS. 1, 2, 4, 13, 14, and 15, the right support 17 is connected to the right portion of the machine frame 12, and the right support 17 has a channel shape in plan view. As shown in FIGS. 2 and 4, the left support 18 is connected to the left portion of the machine frame 12, and the left support 18 has a channel shape in a plan view.

  As shown in FIGS. 1, 2 and 3, the right frame 19 is connected to the right support 17 and extended to the right, and the right light 20 is supported by the right frame 19. The left frame 19 is connected to the left support 18 and extends to the left, and the left light 19 is supported by the left frame 19.

  As shown in FIGS. 1 to 5, the right support bracket 21 is connected to the right support 17, and the left support bracket 21 is connected to the left support 18.

  As shown in FIGS. 4, 5, 13, 14, 15, the fulcrum bracket 21 on the right is from the portion on the airframe center side (left side) of the first portion 21a facing upward and downward along the left-right direction and the first portion 21a. A second portion 21b extends forward along the front-rear direction, and a third portion 21c connected to a portion on the center side (left side) of the second portion 21b on the airframe center side (left side).

  The left fulcrum bracket 21 is a first portion 21a extending downward and leftward along the left and right direction, and a second portion 21b extending forward from the portion on the center side (right side) of the first portion 21a along the longitudinal direction. And a third portion 21c connected to a portion on the center side (right side) of the fuselage in the front of the second portion 21b.

  The first portion 21a of the right fulcrum bracket 21 is connected to the right support 17 by bolts 22 and 23, and the first portion 21a of the left fulcrum bracket 21 is connected to the left support 18 by the bolts 22 and 23. It is done.

(Supporting structure of lifting link mechanism and lifting link mechanism in airframe)
As shown in FIGS. 2, 3 and 4, the elevation link mechanism 7 is disposed on the center side (left side) of the second portion 21 b of the fulcrum bracket 21 of the right in plan view, and the left fulcrum in plan view The second portion 21 b of the bracket 21 is disposed on the center side (right side) of the airframe. The elevating link mechanism 7 is vertically swingably supported by the right and left fulcrum brackets 21 (the second portion 21 b and the third portion 21 c), and is extended to the front side.

  As shown in FIGS. 1 to 5, the elevation link mechanism 7 is a transverse frame connected across the front of the right and left upper links 25, the right and left lower links 26, and the right and left upper links 25. 27 and a transverse frame 28 connected across the rear of the right and left lower links 26.

The rear portion of the right upper link 25 is disposed on the center side (left side) of the second portion 21b of the right fulcrum bracket 21 with respect to the second portion 21b of the right fulcrum bracket 21. Up and down rocking is supported around the axial center P3 in the direction.
The rear portion of the right lower link 26 is disposed on the center side (left side) of the second portion 21b of the right fulcrum bracket 21 with respect to the second portion 21b, and the left and right of the second portion 21b and the third portion 21c of the right fulcrum bracket 21 Up and down rocking is supported around the axis P4 in the direction.

The rear portion of the left upper link 25 is disposed on the center side (right side) of the second portion 21b of the left fulcrum bracket 21 with respect to the second portion 21b of the left fulcrum bracket 21. Up and down rocking is supported around the axial center P3 in the direction.
The rear portion of the left lower link 26 is disposed on the center side (right side) of the second portion 21b of the left fulcrum bracket 21 with respect to the second portion 21b of the left fulcrum bracket 21. Up and down rocking is supported around the axis P4 in the direction.

  An electric cylinder 29 is connected across the lateral frames 27 and 28. When the electric cylinder 29 is operated to extend, the elevator link mechanism 7 is operated to ascend, and when the electric cylinder 29 is operated to contract, the elevator link mechanism 7 is operated to descend.

  With the above structure, in the right fulcrum bracket 21, the first portion 21a connected to the right support portion 17 is positioned on the outer side (right side) of the second portion 21b on which the elevating link mechanism 7 is supported. There is. In the fulcrum bracket 21 on the left side, the first portion 21a connected to the left support portion 18 is located on the outer side (left side) of the machine than the second portion 21b on which the elevating link mechanism 7 is supported.

  As shown in FIG. 2, a portion where the first portion 21 a of the right fulcrum bracket 21 is connected to the right support 17 (the position of the bolt 22) and the first portion 21 a of the left fulcrum bracket 21 is the left support 18 Focusing on the connecting distance W1 which is the distance between both connected parts in the part connected to (the position of the bolt 22), the connecting distance W1 is the width W2 of the airframe side part of the lifting link mechanism 7 It is wider than the right and left upper links 25 (lower link 26).

(Structure of the support connected to the front of the lifting link mechanism)
As shown in FIGS. 4 to 8, the support portion 30 having a channel-shaped cross section is disposed along the left-right direction, and the connection portion 30 a having a channel shape is connected to the right end portion and the left end portion of the support portion 30. ing.

  The front portion of the right upper link 25 is supported so as to be vertically pivotable around an axis P5 in the left-right direction of the right connection portion 30a of the support portion 30. The front portion of the right lower link 26 is supported so as to be pivotable up and down around an axis P6 in the left-right direction of the right connection portion 30a of the support portion 30.

  The front portion of the left upper link 25 is supported so as to be pivotable up and down around an axis P5 in the left-right direction of the left connection portion 30a of the support portion 30. The front portion of the lower left link 26 is supported so as to be vertically pivotable around an axis P6 in the left-right direction of the left connecting portion 30a of the support portion 30.

  Channel-shaped right and left supports 31 having a cross-sectional shape are connected to the supports 30 and extended downward, and the channel-shaped supports 32 extend across the lower portions of the right and left supports 31. Are connected.

(Structure of a rolling mechanism that supports the nozzle support frame in a rollable manner on the front (support) of the lifting link mechanism)
As shown in FIGS. 6 to 10, the nozzle support frame 8 is supported by the rolling mechanism 36 so as to be capable of rolling on the front side portion of the support portion 30.

  The fulcrum member 33 having an angled cross section is connected to the front portion of the support portion 30, and the lower portion of the fulcrum member 33 is open downward. An extending portion 33 a from the lower portion of the left and right center portion of the fulcrum member 33 extends toward the support portion 30 and is connected to the front side portion of the support portion 30.

  The right link member 34 is swingably supported around the right first axial center P1 of the support portion 30 and the fulcrum member 33 in the front-rear direction, and is extended to the lower right side. The left link member 34 is swingably supported around the left first axis P1 of the support portion 30 and the fulcrum member 33 in the front-rear direction, and extends to the lower left side.

As shown in FIGS. 1, 2 and 3, the nozzle support frame 8 comprises a central portion 8a, a right portion 8b and a left portion 8c.
As shown in FIGS. 6 to 10, the right and left connecting members 35 are connected to the central portion 8a of the nozzle support frame 8 and extend rearward. The bracket 35a is connected to the left side portion (machine center side) of the right connection member 35, and the bracket 35a is connected to the right side portion (machine center side) of the left connection member 35.

  A bracket 35a of the right connection member 35 is swingably connected around the front-rear-oriented second axis P2 of the lower portion of the right link member 34. A bracket 35 a of the left connecting member 35 is swingably connected around the front-rear-oriented second axis P 2 of the lower portion of the left link member 34.

  As shown in FIG. 9, in front view, the right second axis P2 is disposed on the outer side (right side) of the right first axis P1, and the outer side (left side) of the left first axis P1. , The left second axis P2 is disposed. Thus, the interval in the left-right direction of the right and left second axis P2 is a larger value than the interval in the left-right direction of the right and left first axis P1.

  As described above, the rolling mechanism 36 includes the right and left link members 34, the structure related to the right and left first axis P1, and the structure related to the right and left second axis P2. In the rolling mechanism 36, when the link member 34 swings to the right around the first axis P1, the nozzle support frame 8 moves upward to the right while moving to the right. When the link member 34 swings to the left around the first axis P1, the nozzle support frame 8 moves upward to the left while moving to the left.

(Structure of front and back displacement prevention part)
As shown in FIGS. 7 to 12, the right and left connecting members 35 extend from the central portion 8 a of the nozzle support frame 8 beyond the support portion 31 to the upper rear side obliquely upward in a side view and a plan view. It is done. A longitudinal displacement preventing portion 37 formed of a rectangular pipe having a rectangular cross section is connected to the rear of the right and left connecting members 35.

  A guide member 38 having a channel-shaped cross section is connected to the right and left support portions 31 by bolts 39, and the guide members 38 are spaced apart on the rear side of the right and left support portions 31. The longitudinal displacement preventing portion 37 passes between the right support portion 31 and the guide member 38 and between the left support portion 31 and the guide member 38.

  A plate 40 made of synthetic resin is attached to the rear surface of the support portion 31 and the front surface of the guide member 38. A hard synthetic resin cylindrical member 41 is externally fitted on the right and left upper bolts 39, the right upper bolt 39 and the cylindrical member 41 are the right stopper portion 42, and the left upper bolt 39 and the cylindrical member 41 are the left stopper portion 42.

  By the longitudinal displacement preventing portion 37 being connected to the central portion 8a of the nozzle support frame 8 through the connecting member 35, the longitudinal displacement preventing portion 37 is integrated with the nozzle support frame 8 by the rolling mechanism 36 as described above. To

  When the nozzle support frame 8 and the longitudinal displacement preventing portion 37 roll, the longitudinal displacement preventing portion 37 slides along the support portion 31 and the plate 40 of the guide member 38, whereby the nozzle supporting frame 8 and the longitudinal displacement preventing portion No. 37 moves to the right while moving to the right without difficulty, and moves to the left while moving to the left without difficulty.

  When the nozzle support frame 8 and the longitudinal displacement preventing portion 37 try to be displaced in the longitudinal direction by, for example, performing a yawing operation, the longitudinal displacement preventing portion 37 contacts the plate 40 of the supporting portion 31 and the guide member 38 in the longitudinal direction As a result, displacement of the nozzle support frame 8 and the longitudinal displacement preventing portion 37 in the longitudinal direction is prevented.

(Function of right and left stoppers)
As shown in FIG. 9 and FIG. 10, when the nozzle support frame 8 and the front-rear displacement preventing portion 37 move upward to the right while being in the upper right position, the upper side portion 37a of the front-rear displacement preventing portion 37 becomes the right stopper portion 42. From the lower side, the rolling of the nozzle support frame 8 and the longitudinal displacement preventing portion 37 is stopped.
Thus, the position at which the upper side portion 37a of the front-rear displacement preventing portion 37 hits the right stopper portion 42 is the right rolling limit position of the nozzle support frame 8.

When the nozzle supporting frame 8 and the longitudinal displacement preventing portion 37 move upward to the left while moving to the left, the upper portion 37a of the longitudinal displacement preventing portion 37 contacts the left stopper portion 42 from the lower side, and the nozzle supporting frame 8 and the nozzle supporting frame 8 The rolling of the front and rear displacement preventing portion 37 is stopped.
Thus, the position at which the upper side portion 37 a of the front-rear displacement preventing portion 37 abuts against the left stopper portion 42 is the left rolling limit position of the nozzle support frame 8.

(Structure of lock mechanism that can fix and release the rolling of nozzle support frame)
As shown in FIGS. 7 to 12, a lock mechanism 46 is provided on the rear side of the front-rear displacement prevention unit 37.

  A through hole 37b is provided at the left and right center portions of the front and rear displacement preventing portion 37 and extends through the front and rear portions of the front and rear displacement preventing portion 37. The front and rear displacement of the front and rear displacement preventing portion 37 The support member 43 is connected to the position of the through hole 37 b of the prevention portion 37.

The lock pin 44 bent in an L-shape is slidably supported along the longitudinal direction in the through holes 37 b of the longitudinal displacement preventing portion 37 and the through holes of the support member 43, and the lock pin 44 is attached on the front side. A biasing spring 45 is provided.
As described above, the lock mechanism 46 includes the support member 43, the lock pin 44, the spring 45, and the like.

  The support portion 32 is located on the front side of the front-rear displacement prevention portion 37, and an opening 32 a is opened in the support portion 32. The position of the lock pin 44 and the position of the opening 32a in the support 32 coincide with each other in a state where the nozzle support frame 8 is parallel to the machine body 3 (support 30).

In the state shown in FIGS. 10 and 12, the rear end of the lock pin 44 is held, the lock pin 44 is slid rearward against the spring 45, and the distal end portion of the lock pin 44 It is in the fixed release state that I put. In this case, by hooking the rear portion of the lock pin 44 to the holding portion 43 a of the support member 43, the lock pin 44 can be held in the unlocked state.
In the unlocked state of the lock mechanism 46, the nozzle support frame 8 and the longitudinal displacement preventing portion 37 roll.

  When the lock mechanism 46 is fixed, the rear portion of the lock pin 44 is removed from the holding portion 43 a of the support member 43, and the lock pin 44 is protruded forward from the through hole 37 b of the front and rear displacement prevention portion 37. It inserts in opening 32a.

  In the fixed state of the lock mechanism 46, the nozzle support frame 8 is fixed in parallel with the airframe 3 (support portion 30) (The above, the nozzle at a predetermined position in the rolling range of the nozzle support frame 8 It corresponds to a state in which the support frame 8 is fixed).

(Positional relationship between the front and back displacement prevention part and each part)
As shown in FIGS. 4 to 12, the support portions 30, 31 and 32 are provided at the front of the body 3 by the elevation link mechanism 7, and the front and back displacement prevention portion 37 is provided on the nozzle support frame 8 in plan view. It is located on the rear side. Thus, the front-rear displacement prevention portion 37 is connected to the nozzle support frame 8 via the connection member 35 and supported at a position separated from the nozzle support frame 8.

  More specifically, as shown in FIGS. 6, 8, 9 and 10, the nozzle support frame 8 is supported by the rolling mechanism 36 so as to be able to roll on the front portions of the support portions 30, 31 and 32.

  As shown in FIGS. 7, 8, 10, and 12, the front-rear displacement preventing portion 37 is disposed on the rear side of the support portions 30, 31, and 32 in a plan view. Thereby, the support portions 30, 31, 32 are disposed between the nozzle support frame 8 and the front-rear displacement prevention portion 37 in a plan view.

  A rolling mechanism 36 (right and left link members 34) is disposed between the nozzle support frame 8 and the supports 30, 31, 32 in a plan view. Thereby, the support portions 30, 31, 32 and the rolling mechanism 36 (right and left link members 34) are disposed between the nozzle support frame 8 and the front-rear displacement prevention portion 37 in a plan view.

  As shown in FIGS. 8 to 11, the connection member 35 is extended obliquely upward from the center portion 8a of the nozzle support frame 8 to the front and rear displacement preventing portions 37 and the right and left link members 34. The lower portion (the second axis P2) of the second shaft P2 is arranged to overlap in a front view (corresponding to a state in which the front and rear displacement preventing portion 37 and the link member 34 overlap in a front view).

  As shown in FIGS. 9, 10 and 11, the connection member 35 extends obliquely upward from the center portion 8a of the nozzle support frame 8 to the upper side, so that the upper portion 37a of the front-rear displacement preventing portion 37 In the side view, it is located above the upper end 8d of the central portion 8a of the nozzle support frame 8 (in a state where the front and rear displacement preventing portion 37 is disposed higher than the nozzle support frame 8 in front view) Equivalent).

As shown in FIG. 10, for example, it is assumed that the nozzle support frame 8 is displaced so as to rotate around an axis P10 along the longitudinal direction of the nozzle support frame 8 (central portion 8a).
In this case, along with the rotational displacement of the nozzle support frame 8, the front and back displacement preventing portion 37 tends to be displaced in the front and back direction, and the front and back displacement preventing portion 37 comprises the plate 40 of the support portion 31 and the guide member 38. The nozzle support frame 8 is prevented from being displaced by rotation.

(Structure of rotational displacement prevention unit)
As shown in FIGS. 6 to 10, an arm portion 47 is connected to the left and right center of the central portion 8 a of the nozzle support frame 8 and extends upward from the central portion 8 a of the nozzle support frame 8.

The rotational displacement preventing portion 51 is provided on the fulcrum member 33. A guide member 48 having a channel shape in cross section is connected to the fulcrum member 33 by a bolt 49, and the guide member 48 is spaced apart on the front side of the fulcrum member 33. A plate 50 made of synthetic resin is attached to the rear surface. An arm portion 47 passes between the fulcrum member 33 and the guide member 48.
By the above structure, the rotational displacement preventing unit 51 includes the fulcrum member 33, the guide member 48, the bolt 49, the plate 50, and the like.

  When the nozzle supporting frame 8 and the longitudinal displacement preventing portion 37 roll, the arm portion 47 slides along the fulcrum member 33 and the plate 50 of the guiding member 48, whereby the nozzle supporting frame 8 and the longitudinal displacement preventing portion 37 It moves upward to the right while moving to the right without difficulty, and moves upward to the left while moving to the left without difficulty.

As shown in FIG. 10, for example, it is assumed that the nozzle support frame 8 is displaced so as to rotate around an axis P10 along the longitudinal direction of the nozzle support frame 8 (central portion 8a).
In this case, along with the rotational displacement of the nozzle support frame 8, the arm portion 47 tries to be displaced in the front-rear direction, and the arm portion 47 moves from the front-rear direction to the fulcrum member 33 and the plate 50 of the guide member 48. In the state of contact, the rotational displacement of the nozzle support frame 8 is prevented.

(Structure of nozzle support frame)
As mentioned above, the nozzle support frame 8 comprises a central portion 8a, a right portion 8b and a left portion 8c.

  As shown in FIGS. 1 to 4, a metal spray pipe 58 is supported along each of the center portion 8 a, the right portion 8 b and the left portion 8 c of the nozzle support frame 8, and the spray pipe 58 is a spray nozzle. 9 are provided.

  As shown in FIGS. 1, 2 and 3, the operation unit 57 is connected to the support frame 56 connected to the protective plate 24 and the right support unit 17, and the operation unit 57 is disposed on the right side of the steering post 14 There is. The hose 59 from the pump 10 is connected to the operation unit 57, and the three hoses 60 from the operation unit 57 are connected to the distribution pipes 58 of the central portion 8a, the right portion 8b and the left portion 8c of the nozzle support frame 8. There is. A return hose 61 is extended from the operation unit 57 and connected to the medicine tank 4.

  With the above structure, the medicine in the medicine tank 4 is supplied from the pump 10 to the operation unit 57 through the hose 59, and is supplied from the operation unit 57 to the distribution pipe 58 through the three hoses 60. The medicine is sprayed to the field, and the surplus medicine is returned from the operation unit 57 to the medicine tank 4 through the hose 61.

  A variable throttling valve (not shown) for returning the excess medicine to the hose 61 is provided in the operation unit 57. When the variable throttle valve is operated to the closing side to reduce the amount of medicine returned to the hose 61, the amount of medicine to be dispersed to the field increases. When the variable throttle valve is operated to the open side to increase the amount of medicine returned to the hose 61, the amount of medicine dispersed to the field decreases.

  Three on-off valves (not shown) for each of the three hoses 60 are provided in the operation unit 57. Scattering nozzles of the central portion 8a (right portion 8b) (left portion 8c) of the nozzle support frame 8 by operating the on-off valve corresponding to the central portion 8a (right portion 8b) (left portion 8c) of the nozzle support frame 8 At 9, spraying and stopping can take place.

(Switching structure of work posture and storage posture in nozzle support frame)
As shown in FIGS. 10 and 16, the central portion 8a of the nozzle support frame 8 is formed by a square pipe having a square cross section. In the central portion 8a of the nozzle support frame 8, the central portion 8a of the nozzle support frame 8 is provided with a rolling mechanism 36 (right and left link members so that the rectangular diagonals A1 and A2 of the cross section are along the vertical and longitudinal directions. It is supported by 34).

  As shown in FIGS. 17, 18 and 19, a fulcrum bracket 52 is connected to the right end and the left end of the center portion 8a of the nozzle support frame 8, and has an oblique posture in which the front is upper and the rear is lower. Thus, the fulcrum pipe 53 is connected to the right and left fulcrum brackets 52.

  As shown in FIG. 16, upper two sides (surfaces) B1 and B2 and lower two sides (surfaces) B3 and B4 of the rectangular cross section of the central portion 8a of the nozzle support frame 8 Among the two sides (surfaces) B1 and B2 described above among the upper front side (surface) B1 and the lower rear side (surface) B3 facing the side (surface) B1. The swinging axis P11 extending across is set by the fulcrum pipe 53.

  As shown in FIGS. 17, 18 and 19, the fulcrum bracket 54 is connected to the end of the right portion 8 b of the nozzle support frame 8, and the right portion 8 b of the nozzle support frame 8 is right via the fulcrum bracket 54. The fulcrum bracket 52 is rockably supported around the rocking axis P11. An electric cylinder 55 for swinging the right portion 8 b of the nozzle support frame 8 is attached across the central portion 8 a and the right portion 8 b of the nozzle support frame 8.

  The fulcrum bracket 54 is connected to the end of the left portion 8c of the nozzle support frame 8, and the left portion 8c of the nozzle support frame 8 is pivoted on the fulcrum bracket 52 via the fulcrum bracket 54. It is supported swingably around. An electric cylinder 55 for swinging the left portion 8c of the nozzle support frame 8 is attached across the central portion 8a and the left portion 8c of the nozzle support frame 8.

  A working posture in which the right portion 8b of the nozzle support frame 8 is extended by the electric cylinder 55 around the swing axis P11 at the right end of the central portion 8a of the nozzle support frame 8 (see solid line in FIG. 9) And, it can be operated to the storage posture (two-dot chain line in FIG. 9, see FIG. 1 and FIG. 2) of the diagonally upward facing backward along the front-rear direction to the right lateral side of the fuselage 3.

  The work posture is extended in the left and right direction around the swing axis P11 of the left end portion of the central portion 8a of the nozzle support frame 8 by the electric cylinder 55, and the left side of the fuselage 3 It can be operated in the storage posture (refer to FIG. 1 and FIG. 2) that is directed backward and obliquely upward along the front-rear direction to the side.

(Structure of storage support)
As shown in FIGS. 1, 2 and 3, the right storage support 62 for supporting the right portion 8b of the nozzle support frame 8 in the storage orientation and the left for supporting the left portion 8c of the nozzle support frame 8 in the storage orientation. A storage support 62 is provided.

  As shown in FIGS. 1, 2, 3 and 15, the right and left storage support 62 includes a base 62a, an arm 62b and a receiver 62c. The base 62a is formed in a channel shape in cross section, and a round pipe-like arm 62b is connected to the base 62a. The arm portion 62 b is bent in an L shape in plan view, and a receiving portion 62 c is connected to an end portion of the arm portion 62 b.

  As shown in FIGS. 13, 14 and 15, the base 62a of the right storage support 62 is disposed on the front side of the first portion 21a of the right fulcrum bracket 21 and in the region on the right of the second portion 21b. There is. The first portion 21 a of the right fulcrum bracket 21 and the base 62 a of the right storage support portion 62 are coupled together by the bolt 22 to the right support portion 17.

  The base 62 a of the left storage support 62 is disposed in front of the first portion 21 a of the left fulcrum bracket 21 and in the region on the left side of the second portion 21 b. The first portion 21 a of the left fulcrum bracket 21 and the base 62 a of the left storage support portion 62 are coupled together by the bolt 22 to the left support portion 18.

  As shown in FIGS. 1, 2 and 3, in the right storage support 62, the arm 62b extends rightward from the base 62a and extends rearward, and the receiving portion 62c is on the right of the floor 13. It is located in The right portion 8b of the nozzle support frame 8 in the storage posture is placed on the receiving portion 62c of the right storage support portion 62, and the right portion 8b of the nozzle support frame 8 is stored by the belt 63 (see FIGS. 13 and 15). It is fixed to the receiving portion 62 c of the support portion 62.

  In the left storage support 62, an arm 62 b extends leftward from the base 62 a and extends rearward, and the receiving portion 62 c is located on the left of the floor 13. The left portion 8c of the nozzle support frame 8 in the storage posture is placed on the receiving portion 62c of the left storage support portion 62, and the left portion 8c of the nozzle support frame 8 is stored by the belt 63 (see FIGS. 13 and 15). It is fixed to the receiving portion 62 c of the support portion 62.

  As shown in FIGS. 14 and 15, in the right storage support 62, the flexible portion 62d, which is an elongated hole along the vertical direction, is opened to the base 62a, and the bolt 22 is co-clamped and connected through the flexible portion 62d. There is. The connection position of the base portion 62a of the right storage support portion 62 can be changed (adjusted) along the flexible portion 62d along the vertical direction, and the height of the receiving portion 62c of the right storage support portion 62 is It can be changed (adjusted).

  In the storage support 62 on the left side, the flexible portion 62d, which is an elongated hole along the vertical direction, is opened in the base 62a, and the bolt 22 is co-clamped and connected through the flexible portion 62d. The connection position of the base portion 62a of the left storage support portion 62 can be changed (adjusted) along the flexible portion 62d along the vertical direction, and the height of the receiving portion 62c of the left storage support portion 62 is It can be changed (adjusted).

(First Embodiment of the Invention)
The lift link mechanism 7 and the nozzle support frame 8 may be supported at the rear of the airframe 3. The lift link mechanism 7 may be abolished, and the nozzle support frame 8 may be supported rolling on the front or rear of the airframe 3 via the rolling mechanism 36.

  The longitudinal displacement preventing portion 37 may be supported at a position separated from the nozzle supporting frame 8 by arranging the longitudinal displacement preventing portion 37 on the upper side, the lower side, and the front side of the nozzle supporting frame 8 .

(Second alternative embodiment of the invention)
The nozzle support frame 8 is supported by the rolling mechanism 36 so as to be capable of rolling on the rear side of the support portions 30, 31, 32 and the front / rear displacement prevention portion 37 is disposed on the front side of the support portions 30, 31, 32 in plan view. You may

In the rolling mechanism 36, the longitudinal displacement preventing portion 37 and the upper and lower intermediate portions of the right and left link members 34 may be arranged to overlap in a front view, and the longitudinal displacement preventing portion 37 and the right and left links The members 34 may be arranged so as not to overlap in a front view.
The central portion 8 a of the nozzle support frame 8 may be directly rockably connected around the second axis P 2 at the bottom of the right and left link members 34.

  In the rolling mechanism 36, the right second axis P2 is disposed on the machine center side (left side) of the right first axis P1 in a front view, and the machine center side (right side) of the left first axis P1. , The left second axis P2 may be disposed. According to this structure, the distance in the left-right direction of the right and left second axis P2 is smaller than the distance in the left-right direction of the right and left first axis P1.

  The cylindrical member 41 is externally fitted to the lower right and left bolts 39, and the lower right bolt 39 and the cylindrical member 41 are used as the right stopper portion 42 against which the longitudinal displacement preventing portion 37 contacts, and the left lower bolt 39 The cylindrical member 41 may be used as the left stopper portion 42 to which the front-rear displacement preventing portion 37 is to be hit.

Instead of providing the lock mechanism 46 at the left and right center of the rear portion of the front and rear displacement preventing portion 37, the lock mechanism 46 is provided on the left and right sides slightly from the left and right center of the rear portion of the front and rear displacement preventing portion 37. You may provide.
According to this structure, in the fixed state of the lock mechanism 46, the nozzle support frame 8 is fixed to the body 3 (support portion 30) in a slightly upward right attitude or a slightly left upward attitude.

The stopper portion 42 may be provided on the support portion 30 and the rolling limit position of the nozzle support frame 8 may be set by the arm portion 47 abutting on the stopper portion 42.
In the rolling mechanism 36, the right and left link members 34 may be eliminated, and the nozzle support frame 8 may be supported rollably around a support shaft (not shown) along the front-rear direction.

(Third alternative embodiment of the invention)
The arm portion 47 may extend downward from the nozzle support frame 8, and the rotational displacement prevention portion 51 may be disposed below the nozzle support frame 8.
The arm portion 47 may extend forward from the nozzle support frame 8 and the rotational displacement prevention portion 51 may be disposed on the front side of the nozzle support frame 8.
The arm portion 47 may extend rearward from the nozzle support frame 8 and the rotational displacement prevention portion 51 may be disposed on the rear side of the nozzle support frame 8.

(Fourth alternative embodiment of the invention)
When the nozzle support frame 8 is supported at the front of the airframe 3, in the central portion 8a of the nozzle support frame 8, the swing axis P11 is set to an oblique posture in which the front is lower and the rear is upper. May be
According to this structure, the right portion 8b (left portion 8c) of the nozzle support frame 8 is operated in the storage position in the obliquely downward direction in the back and forth direction on the right lateral side (left lateral side) of the airframe 3.

When the nozzle support frame 8 is supported at the rear of the airframe 3, in the central portion 8a of the nozzle support frame 8, the rocking axis P11 is set to an oblique posture in which the front is upper and the rear is lower. It is also good.
According to this structure, the right portion 8b (left portion 8c) of the nozzle support frame 8 is operated in a forward and diagonally downward storage posture along the front-rear direction on the right lateral side (left lateral side) of the airframe 3.

In the central portion 8 a of the nozzle support frame 8, the swing axis P 11 may be set in the vertical direction.
According to this structure, the right portion 8b (left portion 8c) of the nozzle support frame 8 is manipulated to the horizontal storage posture in the back and forth direction (forward) along the right lateral side (left lateral side) of the airframe 3 .

(Fifth alternative embodiment of the invention)
When the first portion 21a of the right and left fulcrum brackets 21 is set to be long in the left-right direction in plan view, the elevation link mechanism 7 may be configured as follows.

  The right upper link 25 and the lower link 26 are disposed on the right with respect to the second portion 21 b of the right fulcrum bracket 21, and the right upper link 25 and the lower link 26 are Up and down rocking is supported around the axes P3, P4 of the two portions 21b.

  The left upper link 25 and the rear of the lower link 26 are disposed on the left side with respect to the second portion 21 b of the left supporting bracket 21, and the left upper link 25 and the lower link 26 are Up and down rocking is supported around the axes P3, P4 of the two portions 21b.

  In the right upper link 25 and the lower link 26, one rear portion is disposed on the left side with respect to the second portion 21 b of the right fulcrum bracket 21, and the other rear portion is disposed on the second portion 21 b of the right fulcrum bracket 21. The right upper link 25 and the lower link 26 are supported swingably up and down around the axes P3 and P4 of the second portion 21b of the right fulcrum bracket 21 while being disposed on the right side.

  In the left upper link 25 and the lower link 26, one rear portion is disposed on the right side with respect to the second portion 21 b of the left fulcrum bracket 21, and the other rear portion is disposed on the second portion 21 b of the right fulcrum bracket 21. The left upper link 25 and the lower link 26 are supported swingably up and down around the axes P3 and P4 of the second portion 21b of the left fulcrum bracket 21 while being disposed on the left side.

(Sixth embodiment of the invention)
The right storage support 62 may be connected to the second portion 21 b of the right support bracket 21, and the left storage support 62 may be connected to the second portion 21 b of the left support bracket 21.

  The flexible portions 62d of the right and left storage support portions 62 may be formed in elongated holes along the left-right direction. According to this structure, the connection position of the base 62a of the right (left) storage support 62 is changed (adjusted) along the flexible portion 62d along the left-right direction to adjust the position of the right (left) storage support 62. The position of the receiving portion 62c can be changed (adjusted) in the left-right direction.

  The present invention relates to a passenger type drug spreader equipped with a nozzle support frame supporting a spray nozzle.

Reference Signs List 3 airframe 8 support frame 8a center part of nozzle support frame 8b right part of nozzle support frame 8c left part of nozzle support frame 9 spray nozzle 30, 31, 32 support part 34 link member 35 connection member 36 rolling mechanism 37 front and back displacement prevention part 42 stopper portion 46 locking mechanism 47 arm portion 51 rotational displacement preventing portion A1, A2 diagonal line B1, B2 side portion P1 first axis P2 second axis P10 axis P11 pivot axis

Claims (12)

A nozzle support frame extended in the left and right direction and supporting a spray nozzle for spraying the drug in the field;
A rolling mechanism for rollingly supporting the nozzle support frame on a support of the airframe;
A longitudinal displacement preventing portion configured to prevent longitudinal displacement of the nozzle support frame while rolling integrally with the nozzle support frame;
The passenger-type drug sprayer according to claim 1, wherein the front-rear displacement preventing portion is connected to the nozzle support frame via a connection member and supported at a position separated from the nozzle support frame. An arm portion connected to the nozzle support frame and extending in the vertical direction from the nozzle support frame;
By contacting the arm portion from the front and rear direction, rotational displacement prevention is provided to prevent the displacement of the nozzle support frame around the axial center along the longitudinal direction of the nozzle support frame while allowing the rolling of the nozzle support frame The passenger type drug spreader according to claim 1, further comprising: The arm portion extends upward from the nozzle support frame in a front view,
The riding type medicine spreader according to claim 2, wherein the rotational displacement preventing portion is disposed on the upper side of the nozzle support frame in a front view. The support is provided at the front of the airframe,
The riding type medicine spreader according to any one of claims 1 to 3, wherein the front and rear displacement preventing portion is disposed on the rear side of the nozzle support frame in plan view. The nozzle support frame is rollably supported on the front portion of the support by the rolling mechanism,
The riding type medicine spreader according to claim 4, wherein the front and rear displacement preventing portion is disposed on the rear side of the support portion in plan view.   The riding type drug spreader according to claim 5, wherein the rolling mechanism is disposed between the nozzle support frame and the support in a plan view.   The riding type medicine spreader according to any one of claims 1 to 6, wherein the front and rear displacement preventing portion is disposed at a position higher than the nozzle support frame in a front view. The rolling mechanism is
There are provided right and left link members which are swingably supported around a first axial center of the supporting portion in the front-rear direction and extend downward from the first axial center,
The nozzle support frame is swingably connected around a second axial core in the front-rear direction of the lower part of the link member,
The distance between the right and left first axis and the distance between the right and left second axis are set to different values,
The riding type medicine spreader according to claim 7, wherein the front and rear displacement preventing portion and the link member are arranged to overlap in a front view.   The nozzle support frame is swingably connected around the second axis of the link member by the connection member being swingably connected around the second axis of the link member. The passenger type drug spreader described in 8.   The riding type medicine spreader according to any one of claims 1 to 9, further comprising a stopper portion for setting a rolling limit position of the nozzle support frame by hitting the front / rear displacement preventing portion.   The locking mechanism which can fix and release the nozzle support frame at a predetermined position in the rolling range of the nozzle support frame is provided in the longitudinal displacement preventing portion. A passenger type drug spreader according to any one of the preceding claims. The nozzle support frame includes a central portion, a right portion and a left portion, and the central portion is rollably supported on the support via the rolling mechanism.
The cross section of the central portion is formed in a rectangular shape, and the central portion is supported such that a diagonal of the rectangular shape of the cross section is along the vertical direction and the longitudinal direction,
Of the upper two sides and lower two sides of the rectangular cross section of the central portion, one upper side and one lower side facing the upper side The pivot axis is set over the
The right portion is switchable between a working posture extending in the left and right direction around the swing axis of the right end portion of the central portion and a storage posture disposed along the front and rear direction on the right lateral side of the machine body Supported
The left portion is switchable between a working posture extending in the left and right direction around the swing axis of the left end portion of the central portion and a storage posture disposed along the front and rear direction on the left lateral side of the machine body 12. A passenger drug sprayer according to any one of the preceding claims, which is supported.

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