JP2008125433A - Chemical liquid-mixing and spraying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical liquid-mixing and spraying apparatus which can more simply and easily spray, for example, a diluted chemical liquid diluted into a volume of ≥1,000 times than those of conventional chemical liquid-mixing and spraying apparatuses. <P>SOLUTION: The chemical liquid-mixing and spraying apparatus comprising a pressure-sending pump, a water suction route for communicating a water storage portion for storing water with the suction side of the pressure-sending pump, a chemical liquid supply route for communicating a chemical liquid storage portion for storing the chemical liquid with the middle portion of the water suction route, and a spraying route communicating the extrusion side of the pressure-sending pump is characterized by disposing a chemical liquid supply pump for forcibly supplying the chemical liquid of the chemical liquid storage portion into the water suction route in the chemical liquid supply route, and disposing a flow detector for detecting whether water flows or does not flow in the water suction route, and a controller for controlling the driving of the chemical liquid supply pump. When the flow detector detects the flow of water, the controller drives the chemical liquid supply pump to forcibly supply a prescribed amount of the chemical liquid into the water suction route. When the flow detector does not detect the flow of water, the controller stops the chemical liquid supply pump to control the stop of the supply of the chemical liquid into the water suction route. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chemical liquid mixing and distributing apparatus for mixing a chemical with an aqueous solution and for distributing the mixed chemical on soil such as a field.

  In general, this kind of chemical liquid mixing and distributing device is composed of a pressure feed pump, a merging portion communicating with the suction port of the pressure feeding pump, a chemical liquid supply path communicating the merging portion and the chemical liquid tank, and a merging portion and the water tank. And a spray passage communicating with the discharge port of the pressure pump.

  In addition, a nozzle is provided at the tip of the spraying path via an open / close cock, and a first orifice is interposed in the water absorption path and a second orifice is interposed in the chemical solution supply path.

  The orifice diameter of the first orifice and the orifice diameter of the second orifice are set according to the desired mixing ratio of the chemical solution and water, that is, the dilution factor.

  In the above-described chemical liquid mixing and distributing apparatus, when the pressure pump is started and the open / close cock is opened, the chemical liquid is stored in the chemical liquid supply path and the water tank is stored in the water tank due to the negative pressure generated on the suction side of the pressure pump. In this case, the chemical solution and water are mixed at a mixing ratio set by the orifice diameter of the first orifice and the orifice diameter of the second orifice. It is done. And the diluted chemical | medical agent liquid is spread | dispersed on a field etc. from a nozzle through a spraying path.

  By the way, in the above chemical solution mixing and distributing apparatus, as described above, the dilution rate of the diluted chemical solution is determined by the difference in the orifice diameters of both orifices provided in the water absorption channel and the chemical solution supply channel. For example, if the orifice diameter of the second orifice on the side of the chemical solution supply path is to be reduced to 1000 times or more, there is a natural limit, that is, if the orifice diameter is too small, so-called clogging is likely to occur. Only adjusting the orifice diameter is enough to distribute a dilute solution with a dilution ratio of several hundred times. Therefore, if the drug is used as it is, it is difficult to obtain a dilute solution diluted 1000 times, for example. is there.

  Therefore, when preparing and distributing a chemical solution diluted about 1000 to 2000 times with the above chemical solution distribution apparatus, for example, a chemical solution diluted about 10 times is prepared, and this chemical solution is added to an aqueous solution as needed. By mixing, for example, a desired diluted chemical solution diluted 1000 times is distributed.

  Therefore, in the above chemical solution mixing and distributing apparatus, for example, it is necessary to prepare a chemical solution diluted about 10 times in advance, and not only the workability of the distribution is poor, but also the management of the dilution rate of the diluted chemical solution to be distributed is time-consuming. In some cases, it may lead to the distribution of a dilute solution with the wrong dilution rate.

Further, in the above-described conventional chemical liquid mixing and distributing apparatus, it is difficult to change the dilution factor of the diluted chemical liquid to be distributed during the distribution operation.
JP 11-76906 A

  The present invention has been developed in view of the above circumstances, and the object is to use the chemical solution as it is, and easily and easily, for example, 1000 times or more than the conventional chemical solution mixing and distribution apparatus described above. It is an object of the present invention to provide a chemical liquid mixing and distributing apparatus that can distribute a diluted chemical liquid and that can easily change the dilution rate.

  In order to achieve the above object, the invention described in claim 1 includes a pressure feed pump, a water reservoir that stores water and a suction path that communicates the suction side of the pressure feed pump, and a chemical solution reservoir that stores a chemical solution. A chemical supply path that communicates with the middle of the water absorption path, and a distribution path that communicates with the discharge side of the pressure pump 1. The chemical supply path forcibly supplies the chemical liquid in the chemical storage section to the water absorption path. A chemical solution supply pump is provided to supply the chemical solution supplied from the chemical solution supply pump to the water sent through the water absorption channel and diluted to the desired concentration, and the diluted chemical solution is sprayed through the spray channel. It is characterized by doing so.

  Further, the invention according to claim 2 is the chemical liquid mixing and distributing device according to claim 1, wherein a flow detector for detecting whether or not water is flowing in the water absorption path is provided, and the chemical liquid supply pump is provided. A controller for controlling the driving of the water supply, and when the flow detector detects the flow of water, the controller drives the chemical liquid supply pump to forcibly supply the chemical liquid to the water absorption path by a predetermined amount. When the flow of water is no longer detected, the chemical liquid supply pump is stopped and the supply of the chemical liquid to the water absorption channel is stopped.

  According to a third aspect of the present invention, in the chemical liquid mixing and distributing apparatus according to the first aspect, a first flow rate detector for detecting a flow rate flowing through the water absorption path and a flow rate of the chemical liquid flowing through the chemical liquid supply path 3 are detected. A second flow rate detector is provided, and a controller for controlling the driving of the chemical solution supply pump is provided. The controller is a chemical solution having a desired dilution ratio based on the flow rate of water detected by the first flow rate detector. The flow rate of the chemical solution is controlled by the second flow rate detector to control the drive of the chemical solution supply pump to control the supply amount of the chemical solution by the chemical solution supply pump.

  Further, the invention according to claim 4 is the chemical liquid mixing and distributing device according to claim 1, 2, or 3, wherein an opening / closing means for opening and closing the distributing path is provided at a tip of the distributing path, and the distributing is performed. A return path that connects the path and the water absorption path is provided, and a connection portion between the return path and the distribution path is connected from the distribution path to the return path when the fluid in the distribution path is at a predetermined pressure or less. And a flow path switching device is provided that allows flow from the distribution path to the return path when the fluid in the distribution path reaches a predetermined pressure or higher. is there.

  According to the first aspect of the present invention, since a predetermined amount of the chemical solution is forcibly supplied to the water absorption path by the chemical solution supply pump, the chemical solution can be used as it is, and thus the conventional solution can be used. For example, a diluted chemical solution diluted 1000 times or more can be distributed more easily and easily than a so-called negative pressure type chemical solution mixing and distributing apparatus.

  Further, according to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since it is possible to prevent the dilution rate of the chemical solution from fluctuating inadvertently, the chemical solution having a desired dilution rate can be reduced. It can be distributed stably, and by setting a plurality of types of dilution ratios in advance in the controller, the operator can select a desired dilution rate during the distribution work.

  Further, according to the invention described in claim 3, in addition to the effect of the invention described in claim 1, it is possible to prevent the dilution ratio of the chemical solution from fluctuating inadvertently. It is possible to distribute stably and accurately, and by setting a plurality of types of dilution ratios in advance in the controller, the operator can select a desired dilution rate during the distributing operation.

  Furthermore, according to the invention described in claim 4, in addition to the effect of the invention described in claim 1, 2, or 3, the distribution of the chemical solution is controlled only by operating the opening / closing means provided at the tip of the distribution path. Therefore, the workability of the distribution is further improved.

  FIG. 1 is a configuration diagram showing an example of a chemical liquid mixing and distributing apparatus used for distributing chemicals in a field or the like.

This chemical liquid mixing and distributing apparatus is a so-called stationary type that is mounted on the loading platform of a work truck and used at the destination of chemical liquid distribution. Basically,
Pressure pump 1,
A water absorption path 2 that communicates the suction side of the pressure pump 1 and a water tank 20 as a water reservoir;
A chemical solution supply path 3 that communicates the chemical solution tank 30 for storing the chemical solution and the middle of the water absorption path 2;
A distribution path 4 communicating with the discharge side of the pressure pump 1,
And the reflux path 5 which connects the middle of the distribution path 4 and the downstream of the connection part with the chemical | medical solution supply path 3 in the water absorption path 2 is provided.

  The pressure pump 1 is driven by a prime mover mounted on a work truck.

  The connecting portion between the distribution path 4 and the return path 5 prevents the flow from the distribution path 4 to the return path when the fluid in the distribution path 4 has a pressure lower than a predetermined level, and the fluid in the distribution path 4 exceeds the predetermined level. An unloader valve 50 is interposed as a flow path switching device that allows the flow from the distribution path 4 to the return path when the pressure is reached.

  The laying path 4 is basically composed of a synthetic rubber hose, and an opening / closing cock 41 as an opening / closing means for opening and closing the generally laying path 4 and a chemical liquid mainly mist are formed at the tip of the laying path 4. Nozzle 42 is provided for spreading in a shape.

  And in the above-mentioned chemical | medical solution mixing distribution apparatus, in embodiment shown in FIG. 1, in order to detect whether the water is flowing in the site | part upstream from the connection part with the chemical | medical solution supply path 3 in the water absorption path 2. The flow detector 6 and the reverse flow of allowing the flow of water from the water tank 20 toward the pressure pump 1 in the water absorption path 2 and blocking the flow of water from the water tank 20 toward the water tank 20. A stop valve 60 is provided.

  In the middle of the chemical solution supply path 3, a motor-driven chemical solution supply pump 7 for forcibly supplying the chemical solution in the chemical solution tank 30 to the water absorption channel 2 is provided. Control is performed by a controller 70 on which a microcomputer is mounted.

  As the chemical solution supply pump 7, a tube pump excellent in flow rate accuracy capable of accurately feeding a small amount of flow rate is used, and a vehicle battery 71 mounted on a truck is used as the power source.

  The controller 70 controls the driving of the chemical solution supply pump 7 based on the output signal from the flow detector 6, and specifically, the flow detector 6 detects the flow of water. Accordingly, the chemical liquid supply pump 7 is driven to forcibly feed the chemical liquid into the water absorption path 2 by a predetermined amount. On the other hand, when the flow of water is not detected, the chemical liquid supply pump 7 is stopped to supply the water absorption path 2 to the water absorption path 2. The supply of chemicals is stopped.

  In addition, the controller 70 is selected by the operator so that the flow rate of the chemical solution supply pump 7 can be changed so that a diluted chemical solution having a plurality of dilution factors (eg, dilution factors such as 1000 times, 1200 times, and 1500 times) can be obtained. An amount of a chemical solution that can provide a dilution rate is sent out to the water absorption path 2.

  In the chemical liquid mixing and distributing apparatus having the above configuration, the controller 70 is set to turn on the power of the controller 70 and, for example, a diluted chemical liquid having a dilution factor of 1000 is obtained, and then the pumping pump 1 is driven. When the open / close cock 41 of the distribution path 4 is opened, the water in the water tank 20 flows through the water absorption path 2 via the pressure feed pump 1, and when the flow detector 6 detects the flow of water along with this, the chemical supply pump 7 is driven, the chemical solution in the chemical solution tank 30 is forcibly fed into the water absorption channel 2, mixed with the water flowing through the water absorption channel 2, and the diluted solution diluted 1000 times passes through the distribution channel 4. It is distributed from the nozzle 42.

  On the other hand, when the opening / closing cock 41 is closed in order to interrupt the distribution of the diluted chemical solution, the discharge pressure of the pressure pump 1 is increased, the unloader valve 50 is opened, and the reflux path 5 that has been blocked until then is distributed. Since the dilute chemical liquid in the distribution path 4 is returned to the water absorption path 2 through the reflux path 5 and then sucked into the pumping pump 1 again, the diluting chemical liquid is thus fed into the pumping pump 1, It circulates through a closed circuit composed of the downstream area of the distribution path 4, the reflux path 5, and the water absorption path 2.

  As a result, the water in the water absorption tank 20 is not sent to the water absorption path 2, so that the flow detector 6 does not detect the flow of water and the chemical solution supply pump 7 is stopped by the control of the controller 70, and the water absorption path The supply of the chemical solution to 2 is stopped.

  Therefore, there is no problem that the chemical solution is inadvertently mixed into the diluted chemical solution circulating in the reflux path 5 and the dilution rate of the chemical solution is changed.

  Next, another embodiment of the chemical liquid mixing and distributing apparatus shown in FIG. 2 will be described.

  2 has the same basic configuration as that of the chemical liquid mixing and distributing apparatus shown in FIG. 1, and therefore only different components will be described below.

  That is, when the pump 1 driven by the power source is driven, the discharge amount of the pump also fluctuates with the driving fluctuation of the power source. Therefore, it is difficult to accurately maintain the dilution ratio of the chemical solution.

  2, in order to detect the flow rate flowing through the water absorption path 2 instead of the flow detector 6 provided in the middle of the water absorption path 2 in order to further increase the accuracy of the dilution ratio of the chemical liquid. The first flow rate detector 8a is provided in the middle of the water absorption channel 2, and the second flow rate detector 8b for detecting the flow rate of the chemical solution flowing in the chemical solution supply channel 3 is also provided in the middle of the chemical solution supply channel 3. ing.

  In FIG. 2, the second flow rate detector 8 b is provided on the downstream side of the chemical solution supply pump 7 in the chemical solution supply path 3, but may be provided on the upstream side of the chemical solution supply pump 7.

  And the controller 70 which controls the drive of the chemical | medical solution supply pump 7 is based on the flow volume of the water which the 1st flow rate detector 8a detects by the output signal from the above-mentioned 1st flow rate detector 8a and the 2nd flow rate detector 8b. For example, by controlling the driving voltage of the chemical solution supply pump 7 as needed so that the flow rate of the chemical solution that can be diluted 1000 times is detected by the second flow rate detector, the chemical solution by the chemical solution supply pump 7 is controlled. The amount of supply is controlled.

  Thus, in the chemical liquid mixing and distributing apparatus shown in FIG. 2, the controller 70 is set to turn on the power supply of the controller 70 to obtain, for example, a diluted chemical liquid having a dilution ratio of 1000 times, and then the pressure pump 1 is driven. Subsequently, when the opening / closing cock 41 of the distribution path 4 is opened, the water in the water tank 20 flows through the water absorption path 2 via the pressure feed pump 1.

  Along with this, when the first flow rate detector 8a detects the flow of water, the chemical liquid supply pump 7 is driven and the chemical liquid in the chemical liquid tank 30 is forcibly supplied to the water absorption path 2. The controller 70 for controlling the driving of the pump 7 is, for example, 1000 times based on the flow rate of water detected by the first flow rate detector 8a based on the output signals from the first flow rate detector 8a and the second flow rate detector 8b. The drive voltage of the chemical solution supply pump 7 is controlled as needed so that the flow rate of the chemical solution that can be diluted can be detected by the second flow rate detector, and the supply amount of the chemical solution by the chemical solution supply pump 7 is changed as needed. Since the control is performed, for example, when the pumping pump 1 is driven, even if the discharge amount of the pumping pump 1 fluctuates due to fluctuations in driving of the power source, the dilution ratio of the chemical solution can be accurately maintained.

  On the other hand, when the opening / closing cock 41 is closed in order to interrupt the distribution of the diluted chemical solution, the discharge pressure of the pressure feed pump 1 is increased, the unloader valve 50 is opened, and the reflux path 5 that has been shut off until then is the distribution path. 4, the diluted chemical solution in the distribution channel 4 is returned to the water absorption channel 5 through the reflux channel 5 and then sucked into the pumping pump 1 again. It circulates in the closed circuit which consists of the downstream area of the path 4, the reflux path 5, and the water absorption path 2. FIG.

  Thereby, since the water in the water tank 20 is not sent to the water absorption path 2, the first flow rate detector 8a stops detecting the flow of water, and the chemical solution supply pump 7 is stopped by the control of the controller 70, Supply of the chemical solution to the water absorption path 2 is also interrupted.

  In each of the above-described embodiments shown in FIGS. 1 and 2, water is stored in the water tank 20 in advance, and the water in the water tank 20 is sequentially sent to the water absorption path 2, but as shown in FIG. Further, in addition to the water tank 20, for example, a pumping hose 21 and a pumping pump 22 are provided as pumping paths for pumping water from a paddy field or the like, and the pumping hose 21 and the pumping pump 22 provide the water tank 20 with the pumping hose 21. You may make it pump up water arbitrarily.

  By adopting the above configuration, for example, water used in paddy fields or water flowing through agricultural waterways can be used effectively, and the water tank 20 can be downsized.

Explanatory drawing which shows one Embodiment of the chemical | medical solution mixing distribution apparatus concerning this invention. Explanatory drawing which shows another embodiment of the chemical | medical solution mixing distribution apparatus concerning this invention. Explanatory drawing of the principal part which shows another embodiment of the chemical | medical solution mixing and spreading apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure feed pump 2 Water absorption path 20 Water tank (water storage part)
3 Chemical liquid supply path 30 Chemical liquid tank (chemical liquid storage part)
4 Distributing path 41 Opening / closing cock 42 Nozzle 5 Recirculation path 50 Unloader valve (flow path switching device)
6 Flow detector 7 Chemical liquid supply pump 70 Controller 8a First flow rate detector 8b Second flow rate detector

Claims (4)

  A pumping pump, a water storage path that communicates a water storage section that stores water, and a suction side of the pumping pump, a chemical liquid supply path that communicates a chemical liquid storage section that stores chemical liquid and the middle of the water suction path, and a pressure pump 1 And a chemical supply pump for forcibly supplying the chemical liquid in the chemical storage part to the water absorption path is provided in the chemical supply path, and is supplied by the chemical supply pump. A chemical liquid mixing and distribution apparatus characterized in that a chemical liquid to be mixed is mixed with water sent through a water absorption channel, diluted to an intended concentration, and the diluted chemical liquid is sprayed through a spray channel.   A flow detector for detecting whether or not water is flowing in the water absorption path is provided, and a controller for controlling the driving of the chemical solution supply pump is provided. When the chemical liquid supply pump is driven to forcibly supply a predetermined amount of chemical liquid to the water absorption path and the flow of water is no longer detected, the chemical liquid supply pump is stopped to stop the water absorption. 2. The chemical liquid mixing and distributing device according to claim 1, wherein supply of the chemical liquid to the road is controlled to be stopped.   A first flow rate detector for detecting the flow rate flowing through the water absorption channel and a second flow rate detector for detecting the flow rate of the chemical solution flowing through the chemical solution supply channel 3 are provided, and a controller for controlling the driving of the chemical solution supply pump is provided. The controller controls the driving of the chemical supply pump so that the flow rate of the chemical solution having a desired dilution ratio is detected by the second flow rate detector based on the flow rate of water detected by the first flow rate detector. The chemical liquid mixing and distributing device according to claim 1, wherein the chemical liquid supply amount by the chemical liquid supply pump is controlled.   Opening / closing means for opening and closing the distribution path is provided at the tip of the distribution path, and a return path for connecting the distribution path and the water absorption path is provided, and a connection portion between the return path and the distribution path When the fluid in the distribution path has a pressure below a predetermined level, the flow from the distribution path to the return path is blocked, and when the fluid in the distribution path reaches a pressure above the predetermined level, the flow from the distribution path The chemical liquid mixing and distributing apparatus according to claim 1, 2 or 3, further comprising a flow path switching unit that allows the flow to the reflux path.

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