JP2008142073A - Sprayer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sprayer spraying liquids such as a chemical, a liquid manure and water, decreased in dispersion of spray. <P>SOLUTION: The sprayer 1 includes a multihead hole spray pipe 5 for spraying a liquid fed under pressure and has a dispersion preventing cover 30 surrounding the periphery of blow holes 12 disposed at the multihead hole spray pipe 5. The dispersion preventing cover 30 has an upstream side opening 30e and a downstream side opening 30f each on the upstream and the downstream of the blow hole 12 and are formed so that the opening space of the downstream side opening 30f is larger than that of the upstream side opening 30e. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sprayer that sprays a liquid such as a chemical solution, liquid fertilizer, or water on a field.

  Patent Document 1 describes a self-propelled sprayer 50 in which a multi-headed injection tube 65 that sprays a liquid pumped downward by a pump 71 is supported on a body 51 supported by wheels 52 so as to be able to travel in a field. Has been. Although details are described in Patent Document 1, as shown in FIG. 10, the self-propelled sprayer 50 includes a body 51 supported by four wheels 52 so as to be able to run back and forth, and a substantially central portion of the body 51. In addition, an engine 57 for driving the wheels 52 is installed, and a multi-headed injection tube 65 is supported horizontally at the front end of the body 51 and perpendicular to the traveling direction of the body 51. A liquid supply hose 55 fed from a reel 73 of the dynamic spray device 70 is connected to the multi-head mouth jet 65, and liquid pumped by a pump 71 of the dynamic spray device 70 is supplied from the liquid supply hose 55 to the multi-head mouth jet 65. It is supplied and sprayed from the nozzle 66.

  Patent Document 2 describes a towed traveling sprayer having a gate-shaped frame body composed of a ceiling wall and left and right side walls and having a nozzle hole disposed therein. In this sprayer, it is said that the chemical liquid can be prevented from splashing in three directions by the ceiling wall and the left and right side walls, and further, the chemical liquid can be prevented from scattering backward by hanging the rear covering from the rear end of the ceiling wall. .

JP 2004-209464 A JP 2005-13037 A

  When agricultural chemicals are sprayed by the self-propelled sprayer 50 described in Patent Document 1, the spraying range of the floating spray is wide even in the vicinity of no wind, and the scattering range further expands when there is wind. If spray sprays, for example, on adjacent fields and adheres to crops there, it can happen that the crops are harmed or the agricultural chemical usage standards are violated without our knowledge.

  On the other hand, in the towed traveling sprayer described in Patent Document 2, the spray is prevented from being scattered laterally by surrounding the nozzle hole with a portal frame. However, the portal frame cannot prevent floating spray from splashing outside through the front and rear openings, and even if a rear cover is installed, the floating spray passes under the cover and forms a portal. Get out of the frame and scatter. In particular, when there is wind in an open field, the scattering prevention effect decreases rapidly. Furthermore, the portal frame has a size that covers the entire sprayer, and if this is applied to the self-propelled sprayer described in Patent Document 1, an attempt is made to spray agricultural chemicals simultaneously on a large number of rows. The portal frame is too structurally large to be practically used.

In order to solve the above problems, the sprayer of the first invention is:
In a sprayer equipped with a jet tube for spraying liquid pumped by a pump,
An anti-scatter cover that substantially surrounds the periphery of the nozzle hole disposed in the nozzle tube is installed,
The scattering prevention cover has an upstream opening and a downstream opening on the spray upstream side and the spray downstream side in the nozzle, respectively, and the opening area of the downstream opening is more than the opening area of the upstream opening. It is configured to be large.

  The “substantially surrounding the periphery of the nozzle hole” is not limited to the case where the entire periphery of the nozzle hole is surrounded. For example, when spraying from the nozzle in the scattering prevention cover while having holes, cuts or gaps at any one or two or more locations around the nozzle, the scattering prevention cover Even in the case of surrounding the nozzle hole so that air flows in from the upstream side, the spray flow is amplified, and an airflow flowing vigorously from the upstream side toward the downstream side is generated, It is included in “Summary Go”.

  According to this configuration, the nozzle hole is surrounded by the scattering prevention cover that is open on the upstream side and the downstream side. In the scattering prevention cover, when spraying from the nozzle, air flows into the scattering prevention cover from the upstream side to amplify the spray flow, and an airflow flowing vigorously from the upstream side toward the downstream side is generated. The spray flows downstream along with the air current and adheres to the crops or topsoil planted in the field. Moreover, since the opening area of the downstream opening is larger than the opening area of the upstream opening, airflow is smoothly discharged from the downstream opening. As a result, scattering of floating spray in the lateral direction is reduced, and scattering by wind is also suppressed. If the upstream side of the anti-scattering cover is not opened, not only does the air flow from the upstream side to the downstream side, but also the inside of the anti-scattering cover becomes negative pressure, and the spray floats on the contrary. It cannot be suppressed. In addition, when the opening area of the downstream opening is smaller than the opening area of the upstream opening, a part of the airflow may flow backward to the upstream opening, and the spray is also released from the upstream opening. May end up.

As the sprayer of the second invention, in the first invention,
The scattering prevention cover exemplifies a mode in which a flexible warm-up portion extending toward the downstream side of the spray is disposed in the downstream opening.

  According to this configuration, the warmth-like portion hangs down from the downstream opening and the gap between the downstream opening and the field surface side is narrowed, so that spray spray can be further reduced. In addition, since the warmth-like part has flexibility, even if it contacts crops and topsoil planted in the field, they will not be damaged, and the flow of airflow toward the downstream side will be greatly hindered. There is nothing.

As a sprayer of the third invention, in the second invention,
The sprayer is configured so that the nozzle hole sprays downward toward the field,
The lower edge part of the warmth-like part illustrates an embodiment formed in a shape along the surface shape of the field.

  The surface shape of the field refers to the surface shape of the field itself and the surface shape including crops planted in the field.

  According to this configuration, since the gap between the downstream opening and the field surface side can be further narrowed, the spray scattering can be further reduced.

As a sprayer of the fourth invention, in any one of the first to third inventions,
The said scattering prevention cover is connected with the said nozzle hole or the said nozzle tube, and illustrates the aspect comprised so that attachment or detachment was integrally possible with respect to the sprayer main body side with the said nozzle hole or the said nozzle tube.

  According to this configuration, the occupying space can be reduced during turning, transportation, storage, and the like by removing the anti-scattering cover and the nozzle or the nozzle from the sprayer main body side. This configuration is particularly effective in the case of the following multi-head mouth tube type.

As a sprayer of the fifth invention, in any one of the first to fourth inventions,
The said jet tube illustrates the aspect which is a multi-headed mouth tube in which several nozzle holes were arrange | positioned in the length direction.

As a sprayer of the sixth invention, in the fifth invention,
The aspect (The scattering prevention cover is one aspect) comprised so that the said scattering prevention cover collectively surrounds the circumference | surroundings of all the nozzle holes of a multi-head nozzle can be illustrated.

As a sprayer of the seventh invention, in the fifth invention,
An example in which the scattering prevention cover is divided into a plurality of parts (an aspect in which the scattering prevention cover has two or more) is illustrated. Here, each scattering prevention cover may surround only the periphery of one nozzle hole, or may collectively surround the periphery of two or more nozzle holes.

  As in the sixth and seventh inventions, various forms can be adopted as the anti-scattering cover depending on the form of the jet tube and the like.

As a sprayer of the eighth invention, in any one of the first to seventh inventions,
The jet tube is configured to be extendable and contractible in the length direction thereof,
The said scattering prevention cover illustrates the aspect comprised so that it might expand and contract in conjunction with expansion and contraction of this jet tube.

  According to this structure, the length of the said jet tube and the said scattering prevention cover can be adjusted suitably according to the shape of a farm field, a cultivation form, etc.

As a sprayer of the ninth invention, in any one of the first to eighth inventions,
An example in which a machine body supported by one or more wheels so as to be able to travel in a farm field is provided, and the machine body is equipped with the jet tube and the scattering prevention cover is illustrated.

As a sprayer of the tenth invention, in the ninth invention,
The aspect in which the handle | steering-wheel for advancing the said body by human power is illustrated.

As the sprayer of the eleventh invention, in the ninth invention,
The drive device which drives the said wheel illustrates the aspect installed in the said body.

As a sprayer of the twelfth invention, in the ninth invention,
The aspect in which the connection part for connecting with a separate traction apparatus was installed in the said body is illustrated.

As a sprayer of the thirteenth invention, in any of the ninth to twelfth inventions,
The said jet tube illustrates the aspect supported perpendicular | vertical with respect to the advancing direction of the said body.

  The effects of the present invention can also be obtained by the ninth to thirteenth inventions.

  According to the sprayer of the present invention, spray scattering can be reduced.

  FIGS. 1-7 has shown the sprayer 1 of 1st embodiment which actualized this invention. As shown in FIGS. 1 to 4, the sprayer 1 is a multi-head spray that sprays downwardly the liquid pumped by a pump (not shown) onto a machine body 4 supported by wheels 2 so as to be able to travel in a field H. The tube 5 is supported, and a scattering prevention cover 30 surrounding the periphery of the nozzle 12 arranged in the multi-headed nozzle 5 is provided.

  The airframe 4 is configured to be able to travel with a single wheel 2, and includes a hand push handle 6 for moving the airframe 4 by human power and a flip-up stand 7 for supporting the airframe 4 when traveling is stopped. ing.

  The multi-head nozzle tube 5 of this example has a plurality of nozzle holes 12 arranged in the length direction thereof, and is supported perpendicular to the traveling direction of the airframe 4. The multi-head nozzle 5 is composed of left and right nozzle segments 9 and 9 connected to each other by a flexible hose 14 and a joint portion 15 through a three-way cock 8, and each of the seven nozzles 12 sprays downward. It is installed one by one. The joint portion 15 is supported by the airframe 4, and each nozzle piece 9 can be attached to and detached from the airframe 4 by the joint portion 15. The three-way cock 8 is connected to a liquid supply hose 13 that is fed from a reel of a dynamic spray device (not shown), and the liquid fed by the pump of the dynamic spray device is multi-headed via the three-way cock 8, the hose 14, and the joint portion 15. It is supplied to the jet tube 5 and sprayed from each nozzle 12. In addition, by operating the three-way cock 8, it is also possible to supply liquid to only one of the left and right nozzle pieces 9,9.

  The sprayer 1 is provided with one scattering prevention cover 30 extending to the left and right of the fuselage, and the scattering prevention cover 30 collects the periphery of all of the multi-headed nozzles (14 in this example). It is configured to go around. The position of the nozzle hole 12 in the anti-scattering cover 30 is not particularly limited as long as it is within the anti-scattering cover 30, but in this example, the position is slightly above the center position in the vertical direction of the anti-scattering cover 30.

  As shown in FIGS. 1, 5 and 6, the scattering prevention cover 30 of this example is configured to be split into left and right cover pieces 32, 32 at the center in the left-right direction. A frame 34 as a skeleton for determining the outline of the cover, and a plastic film 35 assembled along the frame 34 with an assembly member 38 (see FIG. 1, for example, a string member, a hook-and-loop fastener, etc.). . The plastic films 35 at the joint portions of the left and right cover pieces 32 are bonded together with a hook-and-loop fastener 39. As a whole, the anti-scattering cover 30 has a substantially trapezoidal front and rear surfaces (see front and rear surfaces 30a and 30b) disposed at a predetermined interval in the front-rear direction and slightly inclined so as to block both ends thereof. A hollow member composed of substantially trapezoidal both side surfaces (see both side surfaces 30c and 30d) arranged in a rectangular shape, and rectangular openings (see upstream side opening 30e and downstream side opening 30f) are formed above and below. In addition, a flexible warm portion 36 extending to the spray downstream side is disposed in the downstream opening 30f. In this example, the warm-warm portion 36 is integrally formed with the plastic film 35. As described above, the scattering prevention cover 30 has the upstream opening 30e and the downstream opening 30f on the spray upstream side and the spray downstream side of the nozzle 12, respectively, and the downstream opening 30f is larger than the opening area of the upstream opening 30e. The opening area is configured to be larger.

  As shown in FIG. 7, the left and right cover pieces 32 are configured such that the respective frame bodies 34 are detachably fixed to the left and right frame mounting portions 37 by fixtures 37a (for example, pins). . Further, the left and right cover pieces 32 are integrated with the respective jet tube pieces 9 by being respectively connected to the left and right jet tube pieces 9. Therefore, the cover 34 and the jet tube piece 9 can be integrally removed from the sprayer 1 by releasing the fixing of the frame body 34 and the frame mounting portion 37 and removing the jet tube piece 9 with the joint portion 15. it can.

  The scattering prevention cover 30 and the multi-headed mouth tube 5 of this example are supported so as to be adjustable in height via a height adjusting portion 16 of the airframe 4 as shown by a two-dot chain line in FIGS. The height adjustment unit 16 includes a support column 16a erected on the front portion of the machine body 4 and a slide unit 16b provided on the support column 16a so that the vertical position can be adjusted. A mouth tube 5 is attached. The slide portion 16b is fixed at a vertical position with respect to the column 16a by a fixing screw 16c.

  When the sprayer 1 of this example is operated, the scattering prevention cover 30 and the multi-headed mouth tube 5 extending to the left and right of the fuselage 4 are lifted up in a hovercraft shape by the air flow from the upstream side to the downstream side in the scattering prevention cover 30. This is a kind of power assist and can be operated with relatively light power.

  In the sprayer 1 of the present example, a desired downward air flow such as the vertical width of the scattering prevention cover 30, the sizes of the openings 30 e and 30 f, or the vertical position of the nozzle 12 in the scattering prevention cover 30 is generated. Can be easily determined experimentally. Further, the shape of the anti-scattering cover 30 is not particularly limited to this example, and for example, those having various contours such as a cylindrical shape and a race track shape can be appropriately employed depending on the number of surrounding nozzle holes 12. .

  According to the sprayer 1 of the present invention configured as described above, the injection hole 12 is surrounded by the anti-scattering cover 30 that is open on the upstream side and the downstream side. When spraying from the nozzle 12 in the scattering prevention cover 30, as shown in FIG. 1, air flows into the scattering prevention cover 30 from the upstream opening 30e, and the spray flow S is amplified, from the upstream side toward the downstream side. A vigorous air stream is generated, and the spray flows downstream along with the air stream and adheres to the crop C or topsoil planted in the field H. Moreover, since the opening area of the downstream opening 30f is larger than the opening area of the upstream opening 30e, airflow is smoothly discharged from the downstream opening 30f. As a result, scattering of floating spray in the lateral direction is reduced, and scattering by wind is also suppressed. If the upstream side of the anti-scattering cover 30 is not open, not only does the air flow from the upstream side to the downstream side not occur, but the inside of the anti-scattering cover 30 becomes negative pressure and the spray floats on the contrary. It cannot be suppressed. In addition, when the opening area of the downstream opening 30f is smaller than the opening area of the upstream opening 30e, a part of the airflow may flow backward to the upstream opening 30e, and the spray is discharged from the upstream opening 30e. It may be done.

  As described above, the downstream opening 30f is formed to have a slightly wider width (front-rear direction width and left-right direction width) than the upstream opening 30e because the spray from the nozzle 12 is conical in the scattering prevention cover 30. It is also to spread.

  Further, since the scattering prevention cover 30 is provided with a flexible warm portion 36 extending downstream of the spray in the downstream opening 30f, the warm portion 36 hangs down from the downstream opening 30f, and the downstream side Since the gap between the opening 30f and the field surface side is narrowed, the spray scattering can be further reduced. In addition, since the warm candy-like part 36 has flexibility, even if it contacts the crop C and topsoil planted in the field H, these will not be damaged, and the flow of the airflow which goes to the downstream is carried out. There is no significant hindrance.

  Moreover, the cover piece 32 of the anti-scattering cover 30 is connected to the jet tube piece 9 and is configured to be detachable integrally with the sprayer main body side together with the jet tube piece 9. For this reason, by detaching the cover piece 32 and the jet tube piece 9 from the sprayer main body, the occupied space can be reduced during turning, transportation, storage, and the like. This configuration is particularly effective in the case of the multi-head mouth tube type as in this example.

  Next, FIG. 8 shows a second embodiment that embodies the present invention. This sprayer is mainly different from the first embodiment in the following points. Accordingly, parts that are the same as in the embodiment will be given the same reference numerals, and redundant description will be omitted (the same applies to other embodiments below).

  The lower side edge 36 a of the warmth-like portion 36 in the scattering prevention cover 30 of this example is formed in a shape along the surface shape of the field H. According to this configuration, in addition to the same effects as those of the first embodiment, the gap between the downstream opening 30f and the field surface side can be further narrowed, so that spray scattering can be further reduced.

  Next, FIG. 9 shows a third embodiment embodying the present invention. This sprayer is mainly different from the first embodiment in the following points.

  In the multi-headed injection tube 5 of this example, a plurality of divided short tubes 41 are communicated with each other via a flexible hose 42, and the flexible hose 42 is provided with a detour portion 42a so as to have an extra length. Thus, expansion and contraction in the length direction of the multi-headed mouth tube 5 is made possible. Further, the part of the frame body 34 of the scattering prevention cover 30 corresponding to the flexible hose 42 can be expanded and contracted in the length direction of the multi-headed outlet tube 5 and can be fixed to the expansion / contraction length by the fastening tool 44. An expansion / contraction site 45 is formed. Then, the short pipes 41 on both sides of the flexible hose 42 are fixed to the both sides of the stretchable part 45 by a connector 46, respectively. Thereby, the scattering prevention cover 30 of this example is configured to expand and contract in conjunction with the expansion and contraction of the multi-headed mouth tube 5. Here, when the expansion / contraction part 45 of the scattering prevention cover 30 is contracted, the plastic film 35 stretched on the expansion / contraction part 45 is configured to be folded in a bellows shape in the expansion / contraction direction of the expansion / contraction part 45. ing.

  According to this configuration, in addition to the same effects as those of the first embodiment, the lengths of the multi-headed mouth tube 5 and the scattering prevention cover 30 can be adjusted as appropriate according to the shape of the field H, the cultivation mode, and the like.

  Next, FIG.11 and FIG.12 has shown 4th embodiment which actualized this invention. This sprayer is mainly different from the first embodiment in the following points.

  The cover piece 80 of this example includes a cover unit mounting portion 81 that is attached to the frame mounting portion 37 (see FIG. 7). One or two or more (in this example) the cover unit mounting portion 81 is provided. Two intermediate cover units 82 and the tip cover unit 83 are coupled in series via coupling portions 84, respectively. Thus, the cover piece 80 of this example is configured to be disassembled into a plurality (three in this example) of units 82 and 83, and the left and right cover pieces 32 in the first embodiment in an assembled state. It is comprised so that it may become equivalent.

  The cover unit mounting portion 81 includes a trapezoidal frame body 81a formed in a substantially trapezoidal shape that is a side cross-sectional shape of the cover piece 80. The intermediate cover unit 82 includes a frame body 82a configured in a substantially trapezoidal column shape extending in the left-right direction, and a plastic film 35 with a warm-warm-shaped portion 36 is formed on two surfaces of the front surface side and the rear surface side of the frame body 82a. Each is stretched. The front cover unit 83 includes a frame 83a configured in a substantially trapezoidal column shape extending in the left-right direction, and warm frame-like portions 36 are provided on the three surfaces of the frame 83a on the front surface side, the rear surface side, and the side end surface side. Each of the plastic films 35 is stretched.

  As shown in FIG. 12, the coupling portion 84 includes a coupling portion first piece 84 a provided on one of the coupling targets and a coupling portion second piece 84 b provided on the other of the coupling targets. The coupling structure of the coupling portion first piece 84a and the coupling portion second piece 84b is not particularly limited, but in this example, a concave portion 86 is provided in the coupling portion first piece 84a and a convex portion 87 fitted into the concave portion 86 is provided. A structure in which the coupling portion second piece 84b is provided and the coupling portion first piece 84a and the coupling portion second piece 84b are fixed by the fixing screw 88 is illustrated.

  According to the sprayer of this example, in addition to the effects of the first embodiment, the cover piece 80 is configured to be disassembled / assembled, so that the cover piece 80 can be occupied during manufacture, assembly, transportation or storage. Space can be reduced.

  Next, FIG. 13 shows a fifth embodiment embodying the present invention. This sprayer is mainly different from the fourth embodiment in the following points.

  The jet tube piece 90 of this example is divided and formed for each partial tube 90 a corresponding to each cover unit 82 (83) in the cover piece 80. The partial pipes 90a are configured such that supports 91 supporting the partial pipes 90a are coupled to each other via a coupling portion 92, and the pipes of the partial pipes 90a are communicated with each other by a flexible hose 93. Each cover unit 82 (83) and the corresponding partial tube 90a can be integrated into a unit.

  According to the sprayer of this example, in addition to the effects of the fourth embodiment, the length of the cover piece 80 and the jet tube piece 90 can be increased by changing the number of connecting the cover unit 82 and the partial tube 90a. It can be changed flexibly according to the situation.

  Next, FIGS. 14 to 16 show a sixth embodiment of the present invention. This sprayer is mainly different from the first embodiment in the following points.

  The sprayer of this example is provided with telescopic arms 100 configured to be extendable and contractable to the side of the machine body on the left and right sides of the machine body of the sprayer. The telescopic arm 100 includes a fixed arm 101 having a base end portion 100a supported by the body of the sprayer, a rail 102 extending in the longitudinal direction of the fixed arm 101, and a slide slidable along the rail 102. And a movable arm 103 provided. In the longitudinal direction of the fixed arm 101 and the moving arm 103, a fixed nozzle piece 104 and a moving nozzle piece 105 are extended, respectively. A plurality of nozzle holes 12 are arranged along the direction. Further, the liquid for spraying is supplied to the fixed nozzle piece 104 and the movable nozzle piece 105 through the flexible hose 106, respectively.

  The anti-scattering cover of this example is attached to the fixed arm 101, the fixed cover piece 107 covering the front side and the rear side of the fixed arm 101, and the moving arm 103, and the front side and the rear side of the moving arm 103. And a moving cover piece 108 covering the side end face side. The side cross-sectional shape of the movable cover piece 108 is formed to be slightly larger than the side cross-sectional shape of the fixed cover piece 107, and when the telescopic arm 100 is contracted as shown in FIGS. The movable cover piece 108 is configured to be in an outer state on the outer periphery.

  According to the sprayer of this example, the same effect as the third embodiment can be obtained.

In addition, this invention is not limited to the said embodiment, For example, it can also be suitably changed and embodied as follows, for example in the range which does not deviate from the meaning of invention.
(1) A mode in which the scattering prevention cover is divided into a plurality of parts.
(2) A mode in which a machine body supported by two or more wheels so as to be able to travel in the field H is provided, and the multi-head nozzle tube 5 and the scattering prevention cover 30 are provided on the machine body.
(3) The scattering prevention cover 30 is applied to, for example, a self-propelled sprayer or a towed sprayer.
(4) Even if the sprayer does not have the multi-head nozzle 5, the sprayer having the nozzle that sprays the liquid pumped downward by the pump surrounds the periphery of the nozzle 12 arranged in the nozzle. At the same time, by providing a scattering prevention cover that is open on the spray upstream side and the spray downstream side, spray scattering can be similarly suppressed.
(5) Although it does not specifically limit as a modification of the structure which surrounds the circumference | surroundings of a nozzle hole by a scattering prevention cover, The following aspect is illustrated.
(5-1) A mode in which the gaps G1 and G2 are present at the center of the front and rear surfaces of the anti-scatter cover 30 (see FIG. 17A).
(5-2) A mode in which gaps G3 and G4 are provided on the left and right sides of the scattering prevention cover 30 (see FIG. 17B).
(5-3) A mode in which (5-1) and (5-2) are combined.

It is a sectional side view which shows the scattering prevention cover of the sprayer which concerns on 1st embodiment of this invention. It is a side view of the sprayer. It is a front view of the sprayer. It is a top view of the sprayer. It is a side view of the state which decomposed | disassembled the scattering prevention cover. It is a front view of the state which decomposed | disassembled. It is a figure which shows the attachment structure of the scattering prevention cover with respect to the body of the sprayer, (a) is a top view, (b) is a side view. It is a front view of the sprayer which concerns on 2nd embodiment of this invention. It is a principal part enlarged front view of the scattering prevention cover of the sprayer which concerns on 3rd embodiment of this invention. It is a top view which shows the conventional sprayer. It is a disassembled perspective view which shows the principal part of the sprayer which concerns on 4th embodiment of this invention. FIG. It is a perspective view which shows the cover unit of the scattering prevention cover of the sprayer. It is a disassembled perspective view which shows the principal part of the sprayer which concerns on 5th embodiment of this invention. It is a perspective view which shows the state which the expansion-contraction arm of the sprayer concerning 6th embodiment of this invention extended. It is a perspective view which shows the state which the expansion-contraction arm of the sprayer shrunk. It is the XVI-XVI sectional view taken on the line of FIG. It is a top view which shows schematic structure of the example of a change of the scattering prevention cover of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sprayer 2 Wheel 4 Airframe 5 Multi-head mouth tube 6 Handle 9 Tube piece 12 Hole 16 Height adjustment part 30 Anti-scattering cover 30a, 30b Front and rear surface 30c, 30d Side surface 30e Upstream opening 30f Downstream opening 32 Cover piece 34 Frame body 35 Plastic film 36 Warm-up portion 36a Lower edge portion 37 Frame attachment portion 37a Fixture 41 Short tube 42 Flexible hose 42a Detour portion 44 Fastening tool 45 Extendable portion 46 Connection tool 80 Cover piece 82 Intermediate cover unit 83 Cover unit 90 for tip 90 Partial tube 100 Telescopic arm 101 Fixed arm 102 Rail 103 Moving arm 104 Fixed tube piece 105 Moving tube piece 107 Fixed cover piece 108 Moving cover piece C Crop H Field S Spray flow G1 G4 gap

Claims (13)

In a sprayer equipped with a jet tube for spraying liquid pumped by a pump,
An anti-scatter cover that substantially surrounds the periphery of the nozzle hole disposed in the nozzle tube is installed,
The scattering prevention cover has an upstream opening and a downstream opening on the spray upstream side and the spray downstream side in the nozzle, respectively, and the opening area of the downstream opening is more than the opening area of the upstream opening. A sprayer configured to be large.   2. The sprayer according to claim 1, wherein the scattering prevention cover is provided with a flexible warm-up portion extending to the downstream side of the spray at the downstream opening. The sprayer is configured so that the nozzle hole sprays downward toward the field,
The sprayer according to claim 2, wherein the lower edge portion of the warm-heated portion is formed in a shape along the surface shape of the field.   The said scattering prevention cover is connected with the said nozzle or the said nozzle tube, The said nozzle or any one of Claims 1-3 comprised integrally with respect to the sprayer main body side with the said nozzle. The sprayer according to one item.   The sprayer according to any one of claims 1 to 4, wherein the nozzle tube is a multi-headed nozzle tube in which a plurality of nozzle holes are arranged in a length direction thereof.   The sprayer according to claim 5, wherein the scattering prevention cover is configured to collectively surround all of the nozzle holes of the multi-head nozzle.   The sprayer according to claim 5, wherein the scattering prevention cover is divided into a plurality of parts. The jet tube is configured to be extendable and contractible in the length direction thereof,
The sprayer according to any one of claims 1 to 7, wherein the scattering prevention cover is configured to expand and contract in conjunction with expansion and contraction of the jet tube.   The sprayer as described in any one of Claims 1-8 provided with the body supported by the 1 or 2 or more wheel so that it can drive | work a farm field, and the said body was equipped with the said jet tube and the said scattering prevention cover.   The sprayer according to claim 9, wherein a handle for causing the airframe to travel manually is installed.   The sprayer according to claim 9, wherein a driving device for driving the wheel is installed in the airframe.   The sprayer according to claim 9, wherein a connecting portion for connecting to a separate traction device is installed in the airframe.   The sprayer according to any one of claims 9 to 12, wherein the jet tube is supported perpendicular to a traveling direction of the airframe.

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