JPH055984Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to chemical spraying devices such as boom sprayers and speed sprayers that spray chemical liquid from nozzles. The present invention relates to a chemical spraying device that can prevent dripping.

[Conventional technology]

A chemical spraying device such as a boom sprayer or a speed sprayer is equipped with a power sprayer, and as the power sprayer operates, a chemical solution in a chemical tank is force-fed to a nozzle, and the chemical solution is ejected from the nozzle. In such a chemical liquid spraying device, when the power sprayer is stopped or when the switching valve that selectively switches the chemical liquid to the nozzle side or the chemical liquid tank side is switched to stop spraying the chemical liquid from the nozzle, the discharge passage of the nozzle pipe etc. The chemical solution remains inside the nozzle, and then drips from the nozzle onto the crops, the ground, etc., causing chemical damage.

In conventional chemical liquid spraying equipment, chemical liquid drips from the nozzle after stopping the power sprayer or after switching the switching valve that selectively switches the chemical liquid to the nozzle side or the chemical liquid tank side to stop spraying the chemical liquid from the nozzle. To prevent dripping, use a nozzle with a built-in check valve, and stop the power sprayer or switch the switching valve that selectively switches the chemical liquid to the nozzle side or the chemical tank side to stop the chemical liquid from being sprayed from the nozzle. When the device stops and the liquid pressure in the discharge passage falls below a predetermined value, the check valve closes and prevents the flow of the chemical to the nozzle spout (e.g., Publication No. 895 of 1983). .

[The problem that the idea attempts to solve]

The problems of such a drip prevention device using a nozzle with a check valve are as follows.

(a) Even after spraying has stopped, chemicals such as agricultural chemicals remain in the nozzle upstream of the check valve, the nozzle pipe, and the discharge pipe, so the components of the chemicals precipitate and solidify. By clogging the spout, etc.
May make subsequent spraying difficult.

(b) During cold seasons, if the temperature drops below zero, residual chemical solution may freeze, causing damage to nozzles, nozzle pipes, discharge piping, etc.

(c) Pesticide components may stick to the valve seat of the check valve, or
If dirt or damage adheres to it, it may cause poor sealing performance and dripping of the chemical solution.

(d) The pressure loss increases because the flow resistance of the chemical increases due to the check valve. In order to make the spray pressure at the nozzle equal to that without a check valve, it is necessary to increase the discharge pressure of the power sprayer, which requires extra power, which reduces the fuel consumption of the prime mover and the durability of the power sprayer. It will be disadvantageous.

(e) Since a check valve is attached to each nozzle, the cost of a chemical spraying device having a large number of nozzles 26 increases significantly.

This invention aims to overcome the listed problems of the prior art.

[Means to solve the problem]

This invention will be explained using reference numerals in the drawings that correspond to the embodiments.

The chemical liquid spraying device according to the first aspect includes a chemical liquid tank 10 that stores a chemical liquid 12, a suction passage 14 that guides the chemical liquid 12 from the chemical liquid tank 10, discharge passages 24, 28, 30 that guide the chemical liquid 12 to a nozzle 26, 1
2 to the chemical tank 10, and the discharge port 22 of the liquid feeding device 18 to the discharge passages 24, 28, 3.
a first switching valve 36 that selectively connects the suction passage 14 or the discharge passages 24, 28, 30 to the suction port 20 of the liquid feeding device 18; 42.

In the chemical liquid spraying device according to claim 2, the first switching valve 3
6 is a manual switching valve 36, and a second switching valve 42
is an electric switching valve 42. The chemical spraying device includes a detector 46 that detects the switching position of the manual switching valve 36, and a sensor 46 that controls the electric switching valve 42 based on the detection signal from the detector 46.
6 connects the discharge port 22 of the liquid feeding device 18 to the discharge passage 24,
A timer 48 is provided to connect the discharge passages 24, 28, 30 to the suction port 20 of the liquid feeding device 18 for a predetermined period of time after switching from 28, 30 to the return passage 38.

[Effect]

In the invention of claim 1, when the chemical liquid 12 is ejected from the nozzle 26, the first switching valve 36 connects the discharge port 22 of the liquid feeding device 18 to the discharge passages 24, 2.
8 and 30, and the second switching valve 42 connects the suction passage 14 to the suction port 20 of the liquid feeding device 18. As a result, the chemical liquid 12 in the chemical liquid tank 10 is sucked into the suction port 20 of the liquid feeding device 18 through the suction passage 14, and further from the discharge port 22 of the liquid feeding device 18 through the discharge passages 24, 28, 30 to the nozzle 26. It is ejected from the nozzle 26 that sends the water to the.

When stopping the ejection of the chemical liquid 12 from the nozzle 26, the first switching valve 36 connects the discharge port 22 of the liquid feeding device 18 to the return passage 38, and the second switching valve 42
is the discharge passage 24, 2 to the suction port 20 of the liquid feeding device 18.
Connect 8 and 30. As a result, the liquid feeding device 18
The supply of the chemical liquid 12 from the discharge port 22 to the discharge passages 24, 28, and 30 is stopped, and the ejection of the chemical liquid 12 from the nozzle 26 is stopped. In addition, the discharge passage 2
The chemical liquid 12 remaining in the liquids 4, 28, and 30 is sucked into the suction port 20 of the liquid feeding device 18 through the second switching valve 42, and is returned to the chemical liquid tank 10 via the return passage 38 from the discharge port 22 of the liquid feeding device 18. be returned to.

When the remaining chemical liquid 12 in the discharge passages 24, 28, and 30 is removed, the second switching valve 42 is switched to a state in which the suction passage 14 is connected to the suction port 20 of the liquid feeding device 18, and after this, the chemical liquid 12 is removed. is chemical tank 1
0, suction passage 14, liquid feeding device 18 and return passage 3
Cycle through 8.

In the invention of claim 2, the manual switching valve 36 as the first switching valve 36 is connected to the discharge port 22 of the liquid feeding device 18.
When the discharge passages 24, 28, 30 are switched to the return passage 38, the timer 48 detects this via the detector 46 and operates the electric switching valve 42 as the second switching valve 42. As a result, nozzle 2
6, the suction port 20 of the liquid feeding device 18 is connected from the suction passage 14 to the discharge passages 24, 28, 30 for a predetermined time, and the liquid feeding device 18
The remaining chemical solution 12 in the discharge passages 24, 28, and 30 is removed.

〔Example〕

This invention will be described below with reference to embodiments shown in the drawings.

Figures 1 to 3 show during spraying of chemical solution, respectively;
FIG. 2 is a diagram showing the flow of the chemical solution immediately after the spraying of the chemical solution ends and after a predetermined time has elapsed from the end of the spraying of the chemical solution, as well as the overall configuration of the chemical solution spraying device. This chemical solution 12 is mounted on, for example, a boom sprayer, and the chemical solution tank 10 stores the chemical solution 12 inside. The suction pipe line 14 leads out the medical solution 12 from the chemical liquid tank 10, and the strainer 16 is disposed in the suction pipe line 14 to prevent foreign matter in the medical liquid 12 from moving upstream. The power sprayer 18 includes an engine and a pump driven by the engine, and pumps the chemical liquid 12 sucked into the suction port 20 from the discharge port 22. A total of three nozzle pipes 24 are attached to the left and right side booms and the center boom of the boom sprayer, and a plurality of nozzles 26 are attached to each nozzle pipe 24 at regular intervals in the longitudinal direction of the nozzle pipe 24. There is. This nozzle 26 does not have a built-in check valve as a device for preventing dripping of the chemical solution 12. The distributor 28 distributes the sent chemical liquid 12 to each discharge pipe 3.
Each discharge pipe 30 is provided corresponding to each nozzle pipe 24 and guides the chemical liquid 12 to the nozzle pipe 24. The pressure regulating valve 32 is
The chemical liquid 12 attached to the distributor 28 and not sent to the discharge pipe 30 is returned to the chemical liquid tank 10 via the residual liquid pipe line 34. Manual spraying three-sided kettle 3
6 connects the discharge port 22 of the power sprayer 18 to the distributor 28
or selectively connected to the return line 38, and the return line 3
8 guides the chemical solution 12 from the three-way spray pot 36 to the chemical solution tank 10. The liquid draining pipe line 40 is commonly connected to all the discharge pipes 30 while preventing the respective discharge pipes 30 from being in communication with each other, and has one end connected to a three-way draining pot 42. The three-way draining pot 42 selectively connects the suction pipe 14 or the liquid draining pipe 40 to the suction port 20 of the power sprayer 18 .

The overall action of the chemical solution 12 will be explained. In addition, in FIG. 1, FIG. 2, and FIG. 3, A, B, and C indicate the flow of the chemical solution 12 in each case, and X indicates that the flow of the chemical solution 12 has stopped at that point. It shows.

FIG. 1 shows a case where the chemical liquid 12 is ejected from the nozzle 26 and the chemical liquid 12 is being sprayed.
In this case, the three-way atomizing outlet 36 connects the outlet 22 of the power sprayer 18 to the distributor 28, and the three-way draining outlet 42 connects the outlet 22 of the power atomizer 18 to the inlet 22 of the power atomizer 18.
Connect the suction line 14 to 0. As a result, the chemical liquid 12 in the chemical liquid tank 10 is sucked into the suction port 20 of the power sprayer 18 via the suction pipe 14, as shown by A, and further from the discharge port 22 of the power sprayer 18 to the distributor 28. , is sent to the nozzle 26 via the discharge piping 30 and the nozzle pipe 24, and the nozzle 2
It erupts from 6.

FIG. 2 shows a case where the residual chemical 12 is removed from the discharge piping 30 and the like immediately after the ejection of the chemical 12 from the nozzle 26 is stopped. In this case,
In order to stop ejecting the chemical solution 12 from the nozzle 26, the three-way spraying tip 36 connects the discharge port 22 of the power sprayer 18 to the return line 38, and also connects the three-way spraying tip 36 to the return pipe 38 to remove the remaining chemical solution 12. Mikata Kotoku 42
is the liquid draining pipe 4 to the suction port 20 of the power sprayer 18.
Connect 0. As a result, the supply of the chemical liquid 12 from the discharge port 22 of the power sprayer 18 toward the distributor 28 is stopped, and the ejection of the chemical liquid 12 from the nozzle 26 is stopped. In addition, the distributor 28, the discharge pipe 30,
The chemical liquid 12 remaining in the nozzle pipe 24 and the nozzle 26 is removed from the liquid draining pipe 4 as shown in B.
The liquid is sucked into the suction port 20 of the power sprayer 18 through a three-way tank 42 for draining the liquid, and then from the discharge port 22 of the power sprayer 18 through the return line 38 to the chemical solution tank 1.
Returned to 0.

FIG. 3 shows a case where the extraction of the chemical liquid 12 from the discharge piping 30 and the like has been completed. When the residual chemical solution 12 is removed from the distributor 28, the discharge pipe 30, the nozzle pipe 24, and the nozzle 26, the three-way liquid removal pot 4
2 is the suction pipe 14 to the suction port 20 of the power sprayer 18
After this, the chemical liquid 12 is transferred to the chemical liquid tank 10, as shown by C.
Suction line 14, power sprayer 18 and return line 38
cycle.

The three-way draining pot 42 may be an electric type that can be switched manually or automatically switched by an electric control signal.

FIG. 4 is a configuration diagram of a control device for the electric three-way draining pot 42. As shown in FIG. The kettle lever 44 is slidably disposed outside the three-way spray kettle 36,
A swing operation is performed by the operator to switch the connection of the three-way spray pot 36. The outlet 22 of the power sprayer 18 is connected to the return line 38 and the distributor 28, respectively, when the lever 44 is in the solid line position and the dash-dotted line position in FIG. 4, respectively. The limit switch 46 is disposed at a location where it can freely come into contact with the lever 44, and when the lever 44 is in the solid line position, it comes into contact with the lever 44,
Turns on. Timer 48 is limit switch 4
6 to the battery 50, and keeps the excitation coil 54 of the relay 52 energized for a predetermined period of time after the limit switch 46 is turned on. The relay 52 includes a make contact 56 and a break contact 58, and the make contact 56 and the break contact 58 are
When the excitation coil 54 is energized, it is on and off, and when it is not energized, it is off and on, respectively. Three-sided pot for draining liquid 42
A control current is sent through the make contact 56 or the break contact 58, and when the make contact 56 is on, the drain line 40 is connected to the inlet 20 of the power sprayer 18.
When the break contact 58 is on, the suction line 14 is connected to the suction port 20 of the power sprayer 18.
As a result, when the operator operates the spray lever 44 of the three-way spraying knob 36 to stop ejecting the chemical solution 12 from the nozzle 26, the timer 48 is activated, and the three-way liquid draining knob 42 is operated for a predetermined period of time. A control current is supplied from the make contact 56, and the liquid draining pipe 40 is connected to the suction port 20 of the power sprayer 18, and the residual chemical 12 in the liquid distributor 28, contact piping 30, etc. is removed from the liquid draining pipe 40. The liquid is extracted through the line 40 and returned to the chemical tank 10 through the return line 38.

[Effect of idea]

This device uses a liquid feeding device that sends the chemical liquid in the chemical liquid tank to the nozzle via the discharge passage, and after the chemical liquid has been ejected from the nozzle, the residual chemical liquid in the discharge passage is removed by the liquid feeding device. removed from Therefore, the following effect occurs.

(a) Since the chemical solution does not remain in the discharge passage, precipitation and solidification of chemical components, freezing of the chemical solution, etc. are avoided, and clogging and damage to nozzles etc. are prevented.

(b) Since the check valve is omitted, it is possible to eliminate various problems caused by check valve failure, such as dripping due to poor sealing performance of the valve seat of the check valve.

(c) Since the check valve is omitted, problems such as pressure loss caused by the presence of the check valve, increased fuel consumption of the prime mover, and cost increase due to the installation of the check valve in each nozzle can be eliminated.

(d) Components already used in the chemical spraying device are used, and additional components include a second switching valve, etc.
Since it is minimized, the device is simplified.

In the second aspect of the present invention, the switching of the first switching valve is detected by the detector, and the second switching valve is automatically switched by the operation of the timer. Therefore,
This eliminates the need to manually operate the second switching valve one by one.
Operation is simplified.

[Brief explanation of drawings]

The drawings relate to an embodiment of this invention, and FIGS. 1 to 3 show the flow of the chemical solution and the overall configuration of the chemical spraying device during spraying of the chemical solution, immediately after the end of spraying the chemical solution, and after a predetermined period of time has passed after the end of the spraying of the chemical solution, respectively. FIG. 4 is a configuration diagram of a control device for an electric three-way draining pot. 10...Medical solution tank, 12...Medical solution, 14...
Suction pipe line (suction passage), 18...Power sprayer (liquid feeding device), 20...Suction port, 22...Discharge port, 2
4... Nozzle pipe (discharge passage), 26... Nozzle, 28... Distributor (discharge passage), 30... Discharge piping (discharge passage), 36... Three-way valve for spraying (first switching valve, manual type switching valve), 38... Return pipe line (return passage), 42... Three-way draining pot (second switching valve, electric switching valve), 46... Limit switch (detector), 48... Timer .

Claims (1)

[Claims for Utility Model Registration] (1) A chemical liquid tank 10 that stores a chemical liquid 12, and an inhalation passage 1 that guides the chemical liquid 12 from this chemical liquid tank 10.
4, and a discharge passage 2 that guides the chemical solution 12 to the nozzle 26.
4, 28, 30, a return passage 38 that guides the chemical liquid 12 to the chemical liquid tank 10, and a second passage that selectively connects the discharge port 22 of the liquid feeding device 18 to the discharge passages 24, 28, 30 or the return passage 38. 1 switching valve 36 and the suction passage 14 or the discharge passages 24, 2 to the suction port 20 of the liquid feeding device 18.
A second switching valve 42 selectively connects 8 and 30.
A chemical liquid spraying device comprising: (2) The first switching valve 36 is a manual switching valve 36, and the second switching valve 42 is an electric switching valve 4.
2, a detector 46 detects the switching position of the manual switching valve 36, and the electric switching valve 42 is controlled based on the detection signal from the detector 46, and the manual switching valve 36 controls the liquid feeding. The discharge port 22 of the device 18 is connected to the discharge passages 24, 28, 3.
A timer 48 for connecting the discharge passages 24, 28, 30 to the suction port 20 of the liquid feeding device 18 for a predetermined period of time after switching from 0 to the return passage 38. Item 1. The chemical spraying device according to item 1.