JP2008142663A - Electrostatic spraying apparatus and wire holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic spraying apparatus capable of effectively discontinuing the continuous film of sprayed droplets and being easily and surely cleaned. <P>SOLUTION: A wire 12 for supplying voltage to an electrostatic spray part 6 is supported by booms 4, 5 with a wire holder 17 having electrical insulating property. The wire holder 17 is provided with an inner cylinder part 18 into which the wire 12 is inserted and an outer cylinder part 20 for forming a circular gap 19 having openings at both side in the length direction of the inner cylinder part 18. The sprayed droplets S charged by electrostatic spray hardly enter the circular gap 19 though being stuck to the exposed part of the wire 12 and the outer surface of the outer cylinder part 20. Thereby, the continuous film of the sprayed droplet S is discontinued in an annular gap 12 to prevent the voltage drop due to the short circuit and the leakage. The annular gap 19 is easily cleaned since both ends of the circular gap 19 are opened and are made to communicate over the whole length. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrostatic spraying device for charging spray droplets of a conductive liquid and attaching them efficiently to an object. The present invention also relates to an electric wire holder suitable for use as a component of the electrostatic spraying device.

  As a kind of electrostatic spraying device, a voltage is supplied to each of a plurality of electrostatic spraying units disposed along the length direction of the boom via electric wires, and spray droplets from each electrostatic spraying unit are supplied to the electrostatic spraying unit. It is known that the adhesion of the spray droplets to an object is improved by applying an electric charge.

  In the electrostatic spraying apparatus as described above, the conductive droplet sprayed from each electrostatic spraying part often adheres around the electric wire. When the adhesion range of the droplets to the electric wire is increased due to the continuous spraying operation, the leakage of the voltage is increased, and it is difficult to perform effective electrostatic application. Further, when a short circuit with the boom occurs through the spray droplets attached to the surface of the electric wire, electrostatic application is not performed.

  Therefore, conventionally, in Patent Document 1 below, as shown in FIGS. 5 and 6, there is a leakage preventing member provided with an annular recess over the entire circumference of the outer periphery of the support for holding the electric wire on the boom. Proposed. And since it is difficult for spray droplets to enter the inside of the annular recess, it is said that a continuous film of droplets can be interrupted by the annular recess and the occurrence of electric leakage can be prevented.

Moreover, in the said patent document 1, as shown in the FIG. 1 thru | or FIG. 4, the leakage prevention member which provided the annular recessed part over the perimeter of the outer periphery of the cylindrical support body by which an electric wire is penetrated is also proposed. In addition, it is described that the same effect as described above can be obtained by this leakage prevention member.
JP 2006-136814 A

  In the thing of the said patent document 1, the back bottom part of the said annular recessed part is closed completely. This can be said to be unavoidable from the element name of a recess (annular recess), and is actually a feature common to all of the disclosed embodiments.

  Even in the case of Patent Document 1, if the spraying operation is continuously performed for a long time or for a long time, it is inevitable that spray droplets enter the annular recess. For this reason, it is necessary to periodically clean the inside of the annular recess and completely remove the agricultural chemical that has entered the annular recess.

  However, since the bottom of the annular recess is closed, it is difficult for water used for cleaning to escape, and it is difficult to sufficiently clean the bottom of the annular recess. In particular, in a boom sprayer provided with a large number of electrostatic spray sections along the boom, the number of leakage prevention members to be cleaned increases, and the cleaning work becomes more complicated.

  The present invention has been made in view of such circumstances, and can effectively interrupt a continuous film of spray droplets formed on the surface of an electric wire, and can also be easily and reliably cleaned. An electrostatic spraying device is to be provided.

  Another object of the present invention is to provide an electric wire holder that can effectively interrupt a continuous film of spray droplets and that can be easily and reliably cleaned.

  In order to solve the above-described problems, an electrostatic spraying device according to the present invention includes a plurality of electrostatic spraying portions disposed along the length direction of the boom, and electrostatic spraying on each of the plurality of electrostatic spraying portions. An electrostatic spraying device comprising an electric wire for supplying a voltage for electric power and an electric wire holder having electric insulation for holding the electric wire against the boom, wherein the electric wire holder An inner cylinder portion to be inserted, an outer cylinder portion that defines an annular gap that opens in the longitudinal direction of the inner cylinder portion around the inner cylinder portion, and the inner cylinder without partitioning the annular gap And a connecting part that connects the outer cylinder part and the outer cylinder part inside the outer cylinder part (Claim 1).

  According to this invention, the said electric wire is penetrated by the said inner cylinder part, and is hold | maintained at the said boom by the said electric wire holder. Even if the spray droplet charged with electrostatic spray adheres to the exposed portion of the electric wire and the outer surface of the outer cylinder portion, it is difficult to enter the annular gap. For this reason, the continuous film | membrane of the said spraying droplet will be interrupted by the said annular clearance, and the said electrostatic spraying part will be hard to be electrically connected with the said boom used as a grounding potential part. Therefore, a voltage drop due to short circuit or electric leakage is prevented.

  In addition, according to the present invention, since the annular gap opens in both the length directions of the inner cylinder portion and communicates over the entire length thereof, the cleaning water supplied into the annular gap is It will not remain inside. For this reason, even if a spray droplet enters into the annular gap, the inside can be easily and reliably cleaned. Since the annular gaps can be easily cleaned with respect to the individual electric wire holders, the cleaning operation can be easily, quickly and reliably performed even if the number of the electric wire holders is large.

  Further, the inner cylinder portion only needs to have a function of inserting and holding the electric wire covered with insulation, and therefore only needs to be a cylinder having both ends opened. For this reason, in addition to a wide selection range of the material and shape of the inner cylinder portion, a seal member and the like are not required. Therefore, the electric wire can be easily inserted and removed regardless of whether the electric wire holder is assembled or not.

  In addition, when spraying is continued for a long time or a long period of time, it is expected that spray droplets floating in the atmosphere enter the annular gap, albeit little by little. As a countermeasure in that case, it is preferable that the connecting portion is disposed at a position as far as possible from the electrostatic spraying portion in the outer cylinder portion. In this way, even if a continuous film of spray droplets is formed in the annular gap, it takes time for the continuous film to reach the connecting part. This is because it is possible to delay as much as possible that the supplied high voltage starts to leak from the wire holder to the boom through the continuous film.

  As a preferred embodiment, the plurality of electrostatic spraying portions are connected in series with the electric wire, and the connecting portion is disposed at a central position in the length direction of the outer cylinder portion. (Claim 2).

  In this case, each electric wire electrically connects two of the plurality of electrostatic spraying portions to each other. For this reason, a part of spray droplets discharged from both of the two electrostatic spraying parts fly and adhere to each of the electric wires and the electric wire holders. Therefore, it is assumed that spray droplets enter the annular gap from both the length directions of the outer cylinder portion. However, if the connecting portion is disposed at the center position in the length direction of the outer cylinder portion, the continuous film of the spray droplets can be formed even if the spray droplets enter the annular gap from any direction. It takes time to reach the connecting portion. Therefore, it is possible to delay as much as possible that the high voltage supplied to the two electrostatic spraying parts starts to leak from the wire holder to the boom through the continuous film, and a state in which continuous spraying is possible. It can be maintained as long as possible.

  On the other hand, the electric wire holder according to the present invention is an electric insulating wire holder for holding an electric wire for supplying a voltage for electrostatic spraying to the electrostatic spraying portion with respect to the fixed portion, the electric wire holder Is inserted through the inner cylinder part, an outer cylinder part that defines an annular gap that opens in the length direction of the inner cylinder part, and the inner cylinder part without partitioning the annular gap. A connecting portion that connects the cylindrical portion and the outer cylindrical portion to each other inside the outer cylindrical portion is provided (Claim 3).

  According to this invention, the said electric wire is penetrated by the said inner cylinder part, and is supported by the said fixing | fixed part by the said electric wire holder. According to the electric wire holder, spray droplets charged by electrostatic spraying do not easily enter the annular gap even if they adhere to the outer surface of the outer cylinder portion. Therefore, the continuous film of spray droplets formed on the exposed portion of the electric wire and the outer surface of the outer cylinder portion is interrupted by the annular gap, and the fixed portion where the electrostatic spray portion becomes the ground potential portion It is difficult to be connected electrically. Therefore, a voltage drop due to short circuit or electric leakage is prevented.

  In addition, according to the present invention, since the annular gap opens in both the length directions of the inner cylinder portion and communicates over the entire length thereof, the cleaning water supplied into the annular gap is It will not remain inside. For this reason, even if a spray droplet enters into the annular gap, the inside can be easily and reliably cleaned.

  As a preferred embodiment, the connecting portion may be disposed at a central position in the length direction of the outer tube portion (claim 4). In this way, even if spray droplets enter the annular gap from any direction in the length direction of the outer cylinder portion, the continuous film of spray droplets can reach the connecting portion. take time. Therefore, it is possible to delay as much as possible that the high voltage supplied to the electrostatic spraying part starts to leak from the wire holder to the fixing part through the continuous film, and a state in which continuous spraying is possible is possible. It can be maintained as long as possible.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a front view of an essential part of an electrostatic spraying apparatus according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of an electric wire holder included in FIG. 1, and FIG. It is III arrow sectional drawing.

  The electrostatic spraying device according to the present invention is a device for charging fine spray droplets of a conductive liquid and attaching them efficiently to an object. In FIG. 1, as an example, agricultural chemicals, fertilizers, etc. are applied to crops. A boom sprayer suitable for use in spraying is shown.

  As shown in FIG. 1, a boom sprayer 1 as an electrostatic spraying device according to an embodiment of the present invention includes a movable body 2 and a boom device 3 mounted on the body 2. Although detailed illustration of the airframe 2 is omitted, it may be a riding type or a non-riding type. Although not shown, the airframe 2 is equipped with a spray liquid tank and a spray pump for pumping the spray liquid in the spray liquid tank to the boom device 3.

  The boom device 3 includes booms 4 and 5 formed of a lightweight material such as aluminum, and a plurality of electrostatic spraying portions 6 disposed at equal intervals in the length direction on the lower surfaces of the booms 4 and 5. I have. According to the boom sprayer 1, the booms 4, 5 are expanded to the left or right side of the traveling direction of the machine body 2, and electrostatic spraying is performed from the electrostatic spraying units 6, thereby widening at a time. Can be sprayed.

  Although not limited, in the present embodiment, the boom device 3 is telescopic so as to be able to cope with the wide and narrowness of the field. That is, the boom is divided into an original boom 4 and a forward boom 5, and the forward boom 5 is movable in the length direction along the original boom 4 supported by the body 2. The electrostatic spraying portions 6 are arranged at equal intervals on each of the former boom 4 and the tip boom 5.

  The electrostatic spraying units 6 are arranged near the outside of the diffusion range of the spray droplets S by spraying the liquid droplets S into the fine droplets S, and spraying the liquid droplets S. An electrode 8 to be applied and a nozzle cover 9 covering the periphery of the spray nozzle 7 are provided.

  The spray nozzle 7 communicates with a liquid supply conduit (not shown) disposed along the booms 4 and 5, and a liquid such as a control agent is directed toward the crops and the like below the booms 4 and 5. Spray. The liquid in the spray liquid tank is pressure-fed by the spray pump to the spray nozzles 6 through the liquid supply conduit.

  The electrode 8 is an annular electrode in the present embodiment, and is concentrically disposed at a lower position in front of the spray nozzle 7 in the spraying direction. Boosters 10 and 11 are respectively arranged corresponding to the booms 4 and 5, and the boosters 10 and 11 are connected to the electrodes 8 of the booms 4 and 5 via electric wires (high-voltage wires) 12. Connected to. In the present embodiment, the electrodes 8 of the electrostatic spray unit 6 are connected in series by the high-voltage electric wires 12 for each of the booms 4 and 5. Each of the boosters 10 and 11 is connected to a power source 13 mounted on the machine body 2 by a low voltage electric wire 14. Each of the boosters 10 and 11 boosts the voltage of power supplied at a low voltage of about 6 V from the power supply 13 to, for example, about 4.5 kV and supplies the boosted voltage to the electrodes 8.

  It should be noted that the telescopic boom is supported while the front boom 5 is supported by the original boom 4, so that the booster 11 on the side of the front boom 5 can be expanded and contracted as a part of the low-voltage wire 14. The curl cord 14a is used. The curl cord 14a is supported and guided by a guide wire 15 installed on the former boom 4.

  The droplets S sprayed from the spray nozzle 7 pass through the space in the electrode 8 while being diffused, and are released into the atmosphere. The spray droplet S is given an electric charge by the electrode 8 when passing through the electrode 8. For this reason, the adherence of the spray droplet S to the object having the reverse polarity is improved.

  The nozzle cover 9 covers the periphery of the spray nozzle 7 and holds the electrode 8. The nozzle cover 9 has electrical insulation, and spray droplets S discharged from the spray nozzle 7 to the outside of the nozzle cover 9 adhere to the peripheral surface of the spray nozzle 9 serving as a ground potential portion. To prevent.

  An intake port 16 is formed on the peripheral surface of the nozzle cover 9 for taking in external air with a negative pressure generated by spraying the liquid from the spray nozzle 7. Along with the liquid spray from the spray nozzle 7, a continuous flow A of air flowing in the spray direction from the intake port 16 is formed in the nozzle cover 9, so that the spray droplets S are formed in the nozzle cover 9. It becomes difficult to enter.

  The high-voltage electric wires 12 that connect the electrostatic spray units 6 and 6 are held by the booms 4 and 5 by an electric wire holder 17 according to an embodiment of the present invention. The total length of each electric wire holder 17 is set to be shorter (for example, 10 to 15 cm) than the distance (for example, 30 cm) between the electrostatic spray units 6 and 6 adjacent to each other. And each said electric wire holder 17 is arrange | positioned between the mutually adjacent things of these electrostatic spraying parts 6, and makes each said boom 4,5 match | combine with each said boom 4,5 and a length direction. It is being fixed with respect to the lower surface. The electric wire holders 17 protect the high-voltage electric wires 12 by preventing the high-voltage electric wires 12 from hanging down between the electrostatic spraying portions 6 and 6.

  By the way, since the spray droplets S discharged from the electrostatic spray units 6 are charged, adhesion to farm products is improved. Similarly, in the vicinity of the electrodes 8 and the electrostatic spray units 6. It easily adheres to each of the high-voltage electric wires 12, the electric wire holder 17, or the booms 4 and 5 serving as ground potential portions. When the spray droplets S adhering to the electrodes 8, the high-voltage electric wires 12 and the electrode holders 17 reach the booms 4 and 5 as continuous films, the spray droplets S become conductive. Therefore, a high voltage leak occurs through the continuous film, and a high voltage necessary for electrostatic application is not effectively applied to the electrode 8.

  Therefore, in the present embodiment, each electric wire holder 17 has a special configuration so that each electric wire holder 17 has an action of blocking the continuous film of the spray droplet S. Specifically, it is as follows.

  As shown in FIG. 2, each of the electric wire holders 17 includes an inner cylindrical portion 18 through which the high-voltage electric wire 12 is inserted and an annular gap 19 that opens in both the length directions of the inner cylindrical portion 18. An outer cylinder part 20 defined around the part 18; and a connecting part 21 for connecting the inner cylinder part 18 and the outer cylinder part 20 to each other inside the outer cylinder part 20 without partitioning the annular gap 19. ing.

  Each of the wire holders 17 is made of an electrically insulating material such as plastic. However, this means that the surface of each electric wire holder 17, that is, the inner and outer peripheral surfaces and end surfaces of each of the inner tube portion 18 and the outer tube portion 20, and the surface of the connecting portion 21 is an electrically insulating material. This is the purpose of the request, including the case where a conductive material is covered with an electrically insulating material.

  The inner cylinder portion 18 has an inner diameter through which the high-voltage electric wire 12 can be inserted. The high-voltage electric wire 12 includes a conductive cable 22 and an electrically insulating tube 23 that covers the conductive cable 22. The inner cylindrical portion 18 does not have to be closed at all, and the cylindrical wall may be a net-like one. The inner cylindrical portion 18 only needs to have a function of inserting and holding the high-voltage electric wire 12 with insulation coating, and therefore only needs to be a cylindrical shape having both ends opened. For this reason, the selection range of the material and shape of the inner cylinder portion 18 is wide, and a seal member and the like are not required. Therefore, even after the electric wire holder 17 is assembled to the booms 4 and 5, the high-voltage electric wire 12 can be easily inserted and removed.

  The inner cylinder portion 18 is accommodated in the outer cylinder portion 20. In FIG. 2, the outer cylinder part 20 and the inner cylinder part 18 are concentrically arranged, but they are not necessarily concentric, and the inner peripheral surface 20 a of the outer cylinder part 20 and the outer periphery of the inner cylinder part 18 are not necessarily required. It is sufficient that the surface 18a is not in contact. As a result, the annular gap 19 is formed between the outer cylinder portion 20 and the inner cylinder portion 18. The annular gap 19 opens toward both the length direction of the outer cylinder portion 20 and the inner cylinder portion 18.

  The electric wire holder 17 is attached to the booms 4 and 5 by supporting the outer cylinder part 20 with respect to the booms 4 and 5 serving as fixed parts. The outer cylinder part 20 may be attached in contact with the booms 4 and 5, but a spacer 24 is preferably used to support the outer cylinder part 20 in a state separated from the booms 4 and 5.

  The spacer 24 may be formed integrally with the outer tube portion 20 in advance, or may be formed separately from the wire holder 17 and attached to the booms 4 and 5 when the wire holder 17 is attached. The wire holder 17 may be connected to the wire holder 17. The spacer 24 is also preferably formed of an electrically insulating material such as plastic. The spacer 24 can be fixed to the booms 4 and 5 using a fixing tool such as a screw 25.

  According to the said structure, the said spraying droplet S discharge | released in the air | atmosphere from the said electrostatic spraying part 6 is the part 12a exposed from the said electric wire holder 17 of the said high voltage | pressure electric wire 12, and the outer periphery of the said outer cylinder part 20. Even if it adheres to the surface, it is difficult to enter the annular gap 19. For this reason, it is possible to prevent the spray droplets S adhering to the exposed portion 12a of the high-voltage electric wire 12 and the spray droplets S adhering to the outer peripheral surface of the outer cylinder part 20 from continuing to each other. Therefore, it is difficult for the electrode 8 to be electrically connected to the booms 4 and 5 serving as the ground potential portion, and a voltage drop due to a short circuit or leakage is prevented.

  The connecting part 21 supports the inner cylinder part 18 in the outer cylinder part 20 without partitioning the annular gap 19.

  By the way, if the spraying is continued for a long time or a long time, it is also expected that the spray droplets S floating in the atmosphere enter the annular gap 19 although they are little by little. As a countermeasure in that case, the connecting portion 21 is disposed as far as possible from the electrostatic spraying portion 6 in the outer cylindrical portion 20, and the extent of the outer cylindrical portion 20 in the length direction is made as small as possible. It is preferable to dispose them. In this way, even if a continuous film of spray droplets S is formed in the annular gap 19, it takes time for the continuous film to reach the connecting portion 21. This is because it is possible to delay as much as possible that the high voltage supplied to the portion 6 starts to leak from the wire holder 17 to the booms 4 and 5 through the continuous film.

  In the present embodiment, since the electrostatic spraying portions 6 are located on both the left and right sides of the wire holder 17, the spray droplets S float almost uniformly in the air near the left and right ends of the wire holder 17. To do. Therefore, if the spray droplets S enter the annular gap 19, it can be estimated that the intrusion amount and the intrusion speed are substantially equal between the left half and the right half of the wire holder 17. Therefore, as shown in FIG. 2, it is preferable that the connecting portion 21 is disposed at a central position in the length direction of the outer tube portion 20. In this way, even if the spray droplet S enters the annular gap 19 from either the left or right end of the wire holder 17, the continuous film of the spray droplet S reaches the connecting portion 21. Since it takes time to do so, it is possible to delay as much as possible that the spray droplet S adhering to the connecting portion 21 is involved in the high voltage leak.

  As shown in FIG. 3, a plurality of the connecting portions 21 are formed at intervals in the circumferential direction of the outer cylinder portion 20 and the inner cylinder portion 18 (three at equal angular intervals in the example of FIG. 3). . As a result, the annular gap 19 opens in both the length directions of the outer cylinder portion 20, and the two openings 19a and 19b extend over the entire length between the inner and outer cylinder portions 18 and 20. A state of communication is ensured.

  According to the electric wire holder 17 having the above-described configuration, the annular gap 19 communicates over the entire length of the outer cylinder portion 20, and the left and right end portions 19a and 19b are open. Even when the droplet S has entered, it can be easily washed with washing water. Further, the cleaning water does not remain in the annular gap 19. Therefore, even if there are a large number of the electric wire holders 17 to be cleaned, the cleaning work can be performed easily, quickly and reliably.

  The electric wire holder 17 can be used not only for the boom sprayer as shown in FIG. 1 but also for various types of spray bottles having a plurality of electrostatic spray parts, and thus has an electrostatic spray part at the tip of the handheld spray bottle. Of course, it can be used also about the electric wire of a hand-held electrostatic spraying apparatus. In this case, an electric wire holder appropriately modified, such as providing the connecting portion 21 at a position near the one end portion far from the electrostatic spraying portion in the outer cylinder portion 20, can be used.

It is a principal part front view of the electrostatic spraying apparatus (boom sprayer) which concerns on one Embodiment of this invention. It is an expanded sectional view of the electric wire holder contained in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2.

Explanation of symbols

1 Electrostatic spraying device (boom sprayer)
4,5 Boom 6 Electrostatic spraying part 12 Electric wire (high voltage electric wire)
17 Electric wire holder 18 Inner cylinder part 19 Annular gap 20 Outer cylinder part 21 Connection part

Claims (4)

  A plurality of electrostatic spray sections (6) disposed along the length direction of the booms (4, 5), and a voltage for electrostatic spray is supplied to each of the plurality of electrostatic spray sections (6). An electrostatic spraying device (1) comprising an electric wire (12) and an electric wire holder (17) having electrical insulation for holding the electric wires (12) against the booms (4, 5). Each of the electric wire holders (17) has an annular gap (19) that opens to both the inner cylindrical portion (18) through which the electric wire (12) is inserted and the length direction of the inner cylindrical portion (18). The outer cylinder part (20) that defines the inner cylinder part (18) and the inner cylinder part (18) and the outer cylinder part (20) without partitioning the annular gap (19). An electrostatic spraying device comprising a connecting portion (21) that is connected to each other inside the cylindrical portion (20).   The plurality of electrostatic spraying parts (6) are connected in series by the electric wire (12), and the connecting part (21) is disposed at a central position in the length direction of the outer cylinder part (20). The electrostatic spraying device according to claim 1.   An electric wire holder (17) having electrical insulation for holding the electric wire (12) for supplying the voltage for electrostatic spraying to the electrostatic spraying portion (6) against the fixing portion (4, 5). Thus, an annular gap (19) opening in both the inner cylinder part (18) through which the electric wire (12) is inserted and the length direction of the inner cylinder part (18) is provided in the inner cylinder part (18). The outer cylinder part (20) defined around the inner cylinder part (18) and the outer cylinder part (20) are separated from each other inside the outer cylinder part (20) without partitioning the annular gap (19). The electric wire holder provided with the connection part (21) to connect.   The electric wire holder according to claim 3, wherein the connecting portion (21) is disposed at a central position in a length direction of the outer tube portion (20).

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