JP2008012433A - Apparatus for spraying liquid and chemical liquid unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a work for changing a kind of chemical liquids and surely prevent a different kind of chemical liquids from being intermixed. <P>SOLUTION: A chemical liquid unit 29 is constituted by unifying a chemical liquid tank 4 and a chemical liquid pump 12 with a connecting member 28 each other. A chemical liquid flow path 13 is detachably connected to an interflowing place 9 of a fresh water W and a chemical liquid S. In case of changing a kind of chemical liquids to spray, the chemical liquid flow path 13 is removed from the interflowing place 9, the chemical liquid unit 29 is changed to another chemical liquid unit, and the chemical liquid flow path of the new chemical liquid unit is connected to the interflowing place 9. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid spraying device and a liquid spraying vehicle equipped with the spraying device. The present invention also relates to a chemical unit.

  As a chemical solution spraying device for spraying a chemical solution (stock solution) of agricultural chemicals or the like while diluting with clean water, Patent Document 1 describes a device having the following configuration. That is, a fresh water tank, a chemical liquid tank, a spray pump, a merging portion where the fresh water in the fresh water tank and the chemical liquid in the chemical liquid tank merge, and the chemical liquid in the chemical liquid tank to the merging portion via the chemical liquid flow path The chemical liquid spraying device includes a chemical liquid pump that feeds out, a mixing channel that communicates from the merging portion to the suction port of the spraying pump, and a spray nozzle that communicates with the discharge port of the spraying pump.

According to this chemical solution spraying apparatus, the capacity of the chemical liquid tank can be much smaller than the capacity of the fresh water tank. For this reason, even if the chemical solution remains in the chemical solution tank at the end of the spraying operation, there is an advantage that the chemical solution is easy to handle because it is small, and the cleaning operation of the chemical solution tank after use is easy.
JP 2004-216205 A

  From the viewpoint of food safety, the introduction of a positive system that prohibits the sale of crops with residual pesticides and chemicals that do not have residue standards, and sprays other chemicals, even in trace amounts, to non-target crops. It is required to strictly prevent this.

  Usually, the types of chemicals to be sprayed differ depending on the type of rice, field crops, fruit trees, etc., but also the insecticide, sterilization, weeding control agent and foliage due to changes in the external environment and growth such as season and weather. It depends on the fertilizer such as spraying and the purpose of spraying. For this reason, it is necessary to change the chemical | medical solution in the said chemical | medical solution tank each time when spraying a different kind of chemical | medical agent. In changing the chemical solution, not only the residual chemical solution in the chemical solution tank is removed and the inside thereof is cleaned, but also the chemical solution pump and the chemical solution flow path must be cleaned, and the cleaning operation becomes extremely complicated. In addition, it was difficult to treat the residual drug.

  The present invention has been made in view of the circumstances as described above, and a problem to be solved is to simplify the operation of changing the type of the chemical solution and reliably prevent mixing of different types of chemical solutions.

  In order to solve the above problems, a liquid spraying apparatus according to the present invention includes a fresh water tank, a chemical liquid tank, a spraying pump, a merging section where the fresh water in the fresh water tank and the chemical liquid in the chemical liquid tank merge, and the chemical liquid tank A chemical pump that feeds the chemical solution to the junction through the chemical channel, a mixing channel that communicates from the junction to the suction port of the spray pump, and a spray that communicates with the discharge port of the spray pump A liquid spraying device having a nozzle portion mounted on the airframe, wherein the chemical liquid tank and the chemical liquid pump are integrated with each other by a connecting member to form a chemical liquid unit, and the chemical liquid flow path is detachably connected to the junction (Claim 1).

  According to the present invention, when the spraying pump and the chemical liquid pump are operated, the clear water of the fresh water tank and the chemical liquid of the chemical liquid tank are merged at the merging portion and sucked into the spray pump, and they are mixed. In this state, it is discharged as a spray liquid from the spray nozzle part. When changing the type of the chemical liquid, the chemical liquid flow path is removed from the junction, and the chemical liquid unit is replaced with another chemical liquid unit. And the chemical | medical solution flow path of a new chemical | medical solution unit is connected to the said confluence | merging part. Thereby, it can respond easily to the change of the kind of chemical | medical solution, and can prevent reliably that the chemical | medical solution from which a kind differs is mixed.

  As a preferred embodiment, the chemical pump includes a single or a plurality of pump elements, a driving source for driving the single or a plurality of pump elements, the single or a plurality of pump elements and the driving source. It is also possible to provide a pump frame that supports them together, and a plurality of the chemical liquid flow paths are provided corresponding to the plurality of pump elements, or branched from the single pump element. ).

  If it does in this way, since the said chemical | medical solution pump which consists of a some component will also be unitized, the assembly of the said chemical | medical solution unit will become easy. Further, since a plurality of the chemical liquid flow paths are provided, a desired chemical liquid feeding performance can be obtained even if the diameter of the chemical liquid flow path is reduced. Therefore, the inner diameter of each of the chemical liquid channels can be made small as long as the self-propelled flow is suppressed according to the viscosity of the chemical liquid, and thereby, when the chemical liquid pump is stopped, Residual chemical liquid is prevented from flowing into the fresh water tank through the junction.

  As a preferred embodiment, the connection of the chemical liquid flow path to the merging portion may be a press-fitting type (Claim 3). If it does in this way, connection of the said chemical | medical solution flow path to the said confluence | merging part and its removal can be performed by one-touch, and it is suitable.

  By the way, in a liquid tank, it is common to attach the fuel gauge which can visually observe the liquid level inside from the outside. However, when this method is applied to the chemical solution tank, there is a concern that the gauge becomes dirty with the chemical solution and immediately becomes unreadable.

  Therefore, as a preferred embodiment, the remaining amount gauge of the chemical liquid tank is a rod gauge having a liquid volume scale, and may be formed separately from the chemical liquid tank. ). In this case, it is possible to easily and surely check the remaining amount of the chemical in the tank by pulling out the bar gauge from the tank and reading the position on the liquid level scale where the chemical has adhered. Since the rod gauge is formed separately from the chemical tank, the attached chemical can be easily wiped off. Therefore, it is not impossible to check the remaining amount of the chemical no matter how many times it is used.

  Next, in the chemical spray vehicle according to the present invention, the liquid spraying device is mounted on a traveling machine body, and the attachment position of the chemical liquid unit to the traveling machine body is used to attach and detach the chemical liquid unit. Is a position that can be performed while standing on the ground. If it does in this way, attachment and detachment of the above-mentioned chemical solution unit to the above-mentioned run body can be performed simply and safely.

  In the chemical unit according to the present invention, the chemical solution tank and the chemical solution pump for delivering the chemical solution in the chemical solution tank from the chemical solution flow path are integrated with each other by a connecting member (Claim 6).

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a piping diagram including a control circuit of a liquid spraying apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of a chemical unit, and FIG. 3 is an example of a mounting position of the chemical unit in FIG. It is a left view of the liquid dispersion wheel shown.

  Specific examples of the liquid spraying apparatus according to the present invention include a boom sprayer that is mounted on a traveling machine such as an agricultural tractor and sprays control liquid, liquid fertilizer, etc. while moving in the field, and air blowing and medicine while traveling in an orchard A speed sprayer for spraying can be used. However, the present invention is not limited to these, and includes a stationary spraying device called a set moving spray.

  In FIG. 1, a liquid spraying apparatus 1 according to the present embodiment includes a spraying pump 5 whose suction port 2 communicates with a fresh water tank 3 and a chemical liquid tank 4. The discharge port 6 of the spray pump 5 communicates with the spray nozzle unit 7. Then, by the operation of the spraying pump 5, the fresh water W in the fresh water tank 3 and the chemical liquid S in the chemical liquid tank 4 are inhaled while being mixed and sprayed from the spray nozzle unit 7 as a spray liquid K. . As shown in FIG. 3, the liquid spraying device 1 is mounted on an appropriate traveling machine body 50 and can spray while moving in the field.

  As shown in FIG. 1, the fresh water tank 3 communicates with a merging section 9 via a fresh water flow path 8, and the merging section 9 is connected to the suction port 2 of the spray pump 5 via a mixing flow path 10. Communicating with The mixing channel 10 is provided with a check valve 11 that prevents the backflow of the spray liquid K toward the merging section 9.

  On the other hand, the chemical tank 4 communicates with the junction 9 through a chemical pump 12 and a chemical flow path 13. The chemical liquid S in the chemical liquid tank 4 is fed to the chemical liquid flow path 13 by the operation of the chemical liquid pump 12 and flows into the merging portion 9. And the fresh water W and the said chemical | medical solution S in the said fresh water tank 3 are mixed and diluted by the predetermined ratio in this junction part 9, and it becomes the spraying liquid K. In the merging section 9 and the mixing channel 10, the fresh water W and the chemical S are inevitably subjected to a forced mixing and stirring action due to the large suction pressure of the spray pump 5. Therefore, there is no bias in the concentration of the spray liquid K.

  The chemical solution S may be, for example, a stock solution of the chemical solution, or may be a solution obtained by diluting the stock solution with water at a higher concentration than the spray solution K in advance. Further, the powdered medicine may be dissolved in water and the concentration may be set to be higher than that of the spray liquid. For this reason, a stirring blade 14 as a stirring means is disposed in the vicinity of the bottom of the chemical tank 4. The stirring blade 14 is rotationally driven by a stirring motor 15. The number of revolutions of the stirring blade 14 is preferably 300 revolutions per minute or less from the viewpoint of preventing the bubbling of the chemical solution.

  As the chemical solution S, if a prediluted solution obtained by diluting a raw solute such as a chemical solution stock solution or a granular drug in advance with a solvent so as to have a higher concentration than the spray solution, homogeneous mixing with water becomes more reliable, The chemical pump 12 is suitable because it can employ a pump with a large minimum feed amount and therefore an inexpensive price.

  As the chemical liquid pump 12, a pump capable of delivering a liquid little by little with quantitative accuracy is used. For example, a tube pump known per se, in particular, a valveless pump such as a roller tube pump can be used. The roller tube pump includes, for example, an elastic tube whose one side is a wall, and pushes out the liquid in the tube by rolling the wall portion while a roller driven by an electric motor 16 is crushed. . According to the roller tube pump, the supply amount of the chemical solution S to the junction can be controlled by controlling the rolling speed of the roller. The operation of the chemical pump 12 is automatically controlled by a control device 17 including a microcomputer.

  Note that the volume ratio between the chemical liquid tank 4 and the fresh water tank 3 may be appropriately determined according to the dilution ratio of the chemical liquid S (for example, 1: 100).

  The discharge port 6 of the spray pump 5 communicates with the spray nozzle portion 7 via a discharge flow path 18. A three-way cock 19 and a flow rate sensor 20 as a switching valve are interposed in the discharge flow path 18 in order from the upstream side. The flow rate sensor 20 detects the flow rate of the spray liquid K pumped toward the spray nozzle unit 7 and provides the detection signal to the control device 17. Then, the control device 17 controls the operation of the chemical liquid pump 12 based on the signal so that, for example, the concentration of the spray liquid K is maintained at a predetermined concentration (dilution ratio) input in advance.

  One of the two switching outlets 21, 22 of the three-way cock 19 communicates with the spray nozzle portion 7, while the other switching outlet 22 is connected to the mixed flow via a return channel 23. It communicates with the road 10. Therefore, when it is desired to temporarily stop spraying during the spraying operation, the driver of the traveling machine body 50 operates the three-way cock 19 at the cockpit to switch the flow path to the return flow path 23 side. Thus, the spray pump 5 can be operated without load.

  In the present embodiment, the return flow path 23 communicates with the mixing flow path 10 on the downstream side of the check valve 11. That is, the check valve 11 is interposed between the connecting portion 24 of the return flow path 23 with respect to the mixing flow path 10 and the merging section 9. Accordingly, the spray liquid K returned from the discharge side of the spray pump 5 to the suction side does not flow back to the junction 9. Therefore, the spray liquid K does not flow back into the fresh water tank 3. Further, even when a valveless pump such as a tube pump is used as the chemical liquid pump 12, there is no fear that the spray liquid K is mixed into the chemical liquid S in the chemical liquid tank 4.

  The liquid spraying apparatus 1 includes a metering channel 25 on the upstream side of the flow rate sensor 20 in the discharge channel 18. The metering channel 25 branches from the discharge channel 18 and communicates with the mixing channel 23. A metering valve 26 such as an electric type is interposed in the metering channel 25. In the illustrated example, the metering flow path 25 communicates with the return flow path 23, but it goes without saying that the metering flow path 25 may be directly connected to the mixing flow path 10 on the downstream side of the check valve 11.

  In addition to the flow rate sensor 20, the liquid spraying device 1 includes various sensors 27 that detect data necessary for always uniforming the spraying amount per unit area. For example, a vehicle speed sensor, a spreading width detection sensor, or the like. The detection signals of these sensors 27 are provided to the control device 17. Then, the control device 17 changes the spraying flow rate according to changes in the moving speed, spraying width, etc. of the liquid spraying device 1 based on the signals, so that the spraying amount per unit area is always uniform. The metering value of the metering valve 26 is controlled.

  In the above configuration, in the present embodiment, as shown in FIG. 2, the chemical tank 4 and the chemical pump 12 are integrated with each other by a support base 28 as a connecting member to form a chemical unit 29. That is, the chemical liquid tank 4 and the chemical liquid pump 12 are placed on the support base 28 so as to be adjacent to each other, and each is fixed to the support base 28. The support base 28 is detachably attached to the traveling machine body 50 by an appropriate fixing tool such as a bolt 30 or a nut (not shown). Moreover, the said chemical | medical solution flow path 13 extended from the said chemical | medical solution pump 12 is connected to the said junction 9 so that removal is possible, and the control wiring 31 extended from the said electric motor 16 of the said chemical | medical solution pump 12 is the said control apparatus. 17 is detachably connected to a connector 32 connected to the connector 17.

  In addition, if the connection method of the said chemical | medical solution flow path 13 with respect to the said confluence | merging part 9 is a press-fitting type, such as an air hose connection, since it can connect and remove by one touch without using a tool, it is suitable. Further, the mounting mode of the chemical liquid unit 29 on the traveling machine body 50 may be a fitting type into a chemical liquid unit receiving portion formed in advance on the traveling machine body 50.

  In the present embodiment, the chemical liquid unit 29 can be attached to the traveling machine body 50 as a single unit and can be detached from the traveling machine body 50. Therefore, when changing the type of chemical liquid to be sprayed, the chemical liquid flow path 13 is removed from the merging portion 9, the control wiring 31 is removed from the connector 32, and the chemical liquid unit 29 is attached to the traveling machine body. Remove from 50. Then, the chemical liquid unit 29 is replaced with another chemical liquid unit having the same configuration. The chemical liquid flow path 13 and the control wiring 31 of a new chemical liquid unit mounted on the traveling machine body are connected to the junction portion 9 and the connector 17. Thereby, it can respond to the change of the kind of chemical | medical solution easily and rapidly.

  The chemical solution adheres to the inner surface of the chemical solution tank 4, the inside of the chemical solution pump 12, and the inner wall of the chemical solution flow path 13 by spraying. For this reason, if the chemical liquid unit 29 in which these are integrated is replaced with another chemical liquid unit for chemical liquid, there is no fear that different types of chemical liquids are mixed and sprayed.

  In addition, although a chemical | medical solution adheres also to the flow path of the spraying liquid K from the said confluence | merging part 9 to the said spraying nozzle part 7, the said spraying pump 5 is operated and only the clear water W in the said freshwater tank 3 is said spraying nozzle. If they are discharged from the section 7, they can be easily cleaned.

  As can be seen from the above description, the user of the liquid spraying device 1 is provided with a plurality of the chemical liquid units 29 according to the types of chemical liquids to be sprayed in one year or in a certain season, while exchanging them. It is preferable to use it. However, this is not necessarily the case. That is, when changing the type of the chemical liquid, the chemical liquid unit 29 may be removed and then washed, mounted again on the traveling machine body 50, and a new chemical liquid may be injected. Also in this case, since the chemical solution unit 29 can be handled as a single unit, there is an advantage that it can be easily and quickly removed and reattached. Further, by removing the chemical liquid unit 29 from the traveling machine body 50, there is an advantage that the chemical liquid tank 4, the chemical liquid pump 12, and the chemical liquid flow path 13 can be easily and reliably cleaned.

  As shown in FIG. 3, in the liquid spray vehicle 51 equipped with the liquid spraying device 1, the mounting position of the chemical liquid unit 29 to the traveling machine body 50 is determined so that an operator can attach and detach the chemical liquid unit 29 on the ground. It is desirable that the position can be performed while standing in the G position. This is because the chemical unit 29 can be attached to and detached from the traveling machine body 50 simply, quickly and safely.

  Further, in the present embodiment, as shown in FIG. 2, the chemical liquid pump 12 includes a plurality of pump elements 33, 33 such as a roller tube type, and the electric motor as a drive source for the plurality of pump elements 33, 33. The motor 16 is provided with a pump frame 34 that supports the plurality of pump elements 33 and 33 and the electric motor 16 together. In this way, the chemical liquid pump 12 composed of a plurality of components is also unitized, so that the chemical liquid unit 29 can be easily assembled.

  Further, in the present embodiment, a plurality of the chemical liquid flow paths 13 are provided corresponding to the plurality of pump elements 33, 33. In the illustrated example, there are two sets of the pump element 33 and the chemical liquid flow path 13, but the configuration includes a single or three or more sets depending on the required amount of the chemical liquid delivered. Of course, a plurality of the electric motors 16 for driving the pump elements 33 may be provided as necessary. Each set of the pump element 33 and the chemical liquid flow path 13 is connected to the junction 9 in parallel with each other.

  In FIG. 2, the two pump elements 33, 33 are supported side by side on the outer surface of the box-shaped pump frame 34, and the stepping motor or the like is positioned above the two pump elements 33, 33. An electric motor 16 is supported. The drive shaft of the electric motor 16 and the driven shaft of each pump element 33 are connected to each other for driving by transmission means such as toothed pulleys 35 and 36 and a toothed belt 37 inside the pump frame 34. .

  Moreover, in this Embodiment, since the said chemical | medical solution flow path 13 is provided with two or more, the following advantages are also acquired.

  Assuming that there is only one chemical liquid flow path, it is necessary to increase the inner diameter of a single chemical liquid flow path to some extent in order to smoothly feed a viscous chemical liquid to the merging portion 9.

  However, when the inner diameter of the single chemical liquid flow path is large, there is a concern that the residual chemical liquid in the single chemical liquid flow path is mixed into the fresh water flow path 8 when the chemical liquid pump 12 is stopped. That is, in FIG. 1, when spraying is stopped by switching the three-way cock 19, the operation of the chemical liquid pump 12 is also stopped by a signal from the flow rate sensor 20, but at this time, the chemical liquid extending to the merging portion 9 is stopped. This is because the chemical liquid S remains in the flow path 13 and the specific gravity of the residual chemical liquid is larger than that of fresh water.

  Therefore, in the present embodiment, each of the chemical liquid channels 13 is suppressed to such an extent that the residual chemical liquid can be prevented from flowing by its own weight while the chemical liquid pump 12 is stopped and being replaced with the fresh water in the fresh water channel 8. The inner diameter is reduced, and a plurality of the chemical liquid channels are arranged in parallel to ensure a necessary cross-sectional area for the entire chemical liquid channel. Thereby, both the smooth feeding of the chemical liquid S and the prevention of the flow of the residual chemical liquid can be achieved. For example, instead of a single pump element having a tube with an inner diameter of 9 mm as a chemical liquid flow path, the required performance can be obtained by using two pump elements having a tube with an inner diameter of 6.5 mm as a chemical liquid flow path.

  Depending on the amount of chemical delivery required, it is possible to divide a plurality of small diameter tubes from a single pump element. Needless to say, a combination of small diameter tubes is also possible.

  Further, the chemical solution spraying apparatus 1 includes a fuel gauge 38 for checking the amount of the chemical solution in the chemical solution tank 4. In the present embodiment, as shown in FIG. 2, the fuel gauge is a bar gauge 38 having a liquid volume scale, and is formed separately from the chemical tank 4.

  In order to check the remaining amount of the chemical solution, the lid (not shown) of the chemical solution tank 4 is removed, the rod gauge 38 is removed from the tank 4, and the position where the chemical solution has adhered is read. Since the bar gauge 38 is formed separately from the chemical tank 4, the attached chemical can be easily wiped off. Therefore, no matter how many times it is used, the remaining amount of the chemical solution cannot be read.

  The rod-shaped gauge 38 may be always mounted in the chemical liquid tank 4 or may be always carried by forming a storage portion at an appropriate location of the chemical liquid unit 29. .

It is a piping diagram including the control circuit of the liquid spraying apparatus which concerns on one embodiment of this invention. It is a perspective view of a chemical | medical solution unit. FIG. 3 is a left side view of a liquid spreading vehicle showing an example of a mounting position of the chemical unit in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid spraying device 2 Suction port 3 Fresh water tank 4 Chemical liquid tank 5 Spray pump 6 Discharge port 7 Spray nozzle part 9 Merge part 10 Mixing flow path 12 Chemical liquid pump 13 Chemical liquid flow path 16 Drive source (electric motor)
28 Connecting member (support)
29 Chemical liquid unit 33 Pump element 34 Pump frame 38 Rod gauge 50 Traveling machine body 51 Liquid spreading wheel G Ground S Chemical liquid W Shimizu

Claims (6)

  A fresh water tank (3), a chemical liquid tank (4), a spray pump (5), a merging section where the fresh water (W) of the fresh water tank (3) and the chemical liquid (S) of the chemical liquid tank (4) merge. (9), a chemical liquid pump (12) that feeds the chemical liquid (S) in the chemical liquid tank (4) to the merging section (9) via the chemical liquid flow path (13), and the merging section (9) to A mixing channel (10) communicating with the suction port (2) of the spray pump (5) and a spray nozzle section (7) communicating with the discharge port (6) of the spray pump (5) are provided. In the liquid spraying device (1), the chemical liquid tank (4) and the chemical liquid pump (12) are integrated with each other by a connecting member (28) to form a chemical liquid unit (29), and the chemical liquid flow path (13) Is a liquid spraying device, which is detachably connected to the junction (9).   The chemical pump (12) includes a single or plural pump elements (33, 33), a drive source (16) for driving the single or plural pump elements (33, 33), and the single or plural pump elements (33, 33). The pump element (33, 33) and the pump frame (34) supporting the drive source (16) together, and the chemical flow path (13) branches from the single pump element (33), Or the liquid spraying apparatus of Claim 1 provided with two or more corresponding to these pump elements (33, 33).   The liquid spraying device according to claim 1 or 2, wherein the chemical liquid flow path (13) is connected to the junction (9) by press-fitting.   The remaining amount gauge of the said chemical | medical solution tank (4) is a rod-shaped gauge (38) which has a liquid quantity scale, and is formed separately from the said chemical | medical solution tank (4). Liquid spraying device.   A liquid sprayer (51) in which the liquid spraying device (1) according to any one of claims 1 to 4 is mounted on a traveling machine body (50), wherein the chemical solution to the traveling machine body (50) is provided. The liquid sprayer in which the unit (29) is attached at a position where the operator can perform the attaching / detaching operation of the chemical unit (29) while the operator stands on the ground (G).   A chemical solution unit in which a chemical solution tank (4) and a chemical solution pump (12) for delivering the chemical solution (S) in the chemical solution tank (4) from the chemical solution flow path (13) are integrated with each other by a connecting member (28). .

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