JP2008012486A - Chemical spraying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chemical spraying apparatus capable of removing the residual pressure of a discharge pipe line in the upstream side of a branched pipe line on-off valve even when all of respective branched pipe line on-off valves of the branched pipe lines connected to each spray nozzle are closed and the spray from all spray nozzles is stopped in the spray work of the chemical. <P>SOLUTION: The chemical spraying apparatus is provided with a five-way selector valve 21 for selectively connecting a chemical tank 2 or a cleaning liquid tank 16 to the suction side of a pump 30, the plurality of branched pipe lines 45, 46, 47, 48, 49 branched from the discharge pipe line 44 connected to the discharge side of the pump, a spray nozzle 9 connected to each of the branched pipe line, the on-off valves 23, 24, 25, 26, 27 for opening and closing each branched pipe line, cleaning nozzles 33, 34 for cleaning the inside of the chemical tank, a chemical tank discharge pipe line 59 for connecting the discharge pipe line to the cleaning nozzle and a chemical tank discharge pipe line on-off valve 28 for opening and closing the chemical tank discharge pipe line and only when the plurality of on-off valves are in a closed state, the chemical discharge pipe on-off valve is made open. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chemical solution spraying device for spraying a chemical solution in a chemical solution tank from a spray nozzle.

  Conventionally, as such a chemical liquid spraying device, for example, in Patent Document 1, a cleaning liquid tank is provided separately from the chemical liquid tank, and when the chemical liquid spraying operation is completed and the chemical liquid tank is empty, the cleaning liquid tank and the chemical liquid tank The open / close valve provided in the pipe line is operated by the switching lever at the driver's seat to the open position, the cleaning liquid in the cleaning liquid tank is introduced into the chemical liquid tank, and the cleaning liquid containing the chemical liquid is pumped to the spray nozzle by the pump. There is described a chemical solution spraying device for spraying a field and thereby washing a chemical solution tank and a chemical solution feeding path.

  Further, in Patent Document 2, a cleaning liquid introduction control valve for selectively sucking a cleaning liquid and a chemical liquid (spraying liquid) in a chemical liquid tank (spraying liquid tank) is provided in the pump, and when cleaning the flow system of the spraying liquid, A chemical spraying device is described in which a pump is sucked into a pump and pumped to a spray nozzle. In addition, the spray nozzle is provided with two types of liquid fertilizer nozzles and chemical liquid nozzles, and is configured to be switched by a switching valve (three-way valve) to selectively feed liquid fertilizer and chemical liquid to any one of the spray nozzles.

  Further, in Patent Document 3, a chemical liquid tank for storing a chemical liquid and a cleaning liquid tank for storing a cleaning liquid are provided. When there is no chemical liquid in the chemical liquid tank, the chemical liquid detection means detects this, and based on this detection signal. The first switching valve connects the suction side of the pump from the chemical tank to the cleaning liquid tank, and the cleaning liquid in the cleaning tank is pumped by the pump, and depending on the switching position of the second switching valve, the spray nozzle side or the chemical tank A chemical spraying device to be sent to the side is described. When the cleaning liquid is sent to the spray nozzle side, the cleaning liquid is sprayed from the spray nozzle, while when the cleaning liquid is sent to the chemical liquid tank side, the cleaning liquid is introduced into the chemical liquid tank, and the chemical liquid is passed through the discharge valve. It is discharged from the tank to the outside. When the cleaning liquid passes through the path of the chemical liquid, the path is cleaned.

Japanese Patent Publication No. 7-79595 Utility Model Registration No. 2511004 Utility Model Registration No. 2536011

  However, in any of the chemical liquid spraying devices described in Patent Documents 1 to 3, in the spraying operation for spraying (spraying) the chemical liquid in the chemical liquid tank from a plurality of spray nozzles, If all the open / close valves are closed and injection from all the spray nozzles is stopped, residual pressure is generated in the discharge pipe upstream of the open / close valves of the branch pipes. There is a risk that a pressure sensor or the like may malfunction in a speed-linked spraying device or the like when performing precise control in a self-propelled or on-board type chemical spraying device.

The present invention has been made in view of the above circumstances, and in the spraying operation of the chemical solution, all the branch pipe opening / closing valves of the branch pipes connected to the respective spray nozzles are closed, and all the spray nozzles are connected. It is an object of the present invention to provide a chemical spraying device capable of removing the residual pressure in the discharge pipe upstream of the branch pipe opening / closing valve even when the injection is stopped.
Further, the present invention is capable of cleaning the chemical tank and the liquid supply path, and in the chemical spraying operation, all the branch pipe on / off valves of the branch pipes connected to the spray nozzles are closed, An object of the present invention is to provide a chemical solution spraying device that can remove the residual pressure in the discharge pipe upstream of the branch pipe opening / closing valve even when the spraying from the spray nozzle is stopped.

  In order to achieve the above object, a chemical liquid spraying device according to claim 1 includes a chemical liquid tank (2) for storing a chemical liquid, a discharge pipe (44) connected to a discharge side of a pump (30), and the discharge A plurality of branch pipes (45, 46, 47, 48, 49) branched from the pipe (44) and spray nozzles connected to the branch pipes (45, 46, 47, 48, 49), respectively. (9), a plurality of branch pipe opening / closing valves (23, 24, 25, 26, 27) for opening and closing each of the branch pipes (45, 46, 47, 48, 49), and the discharge pipe ( 44) and a chemical liquid tank discharge pipe (59) for connecting the chemical liquid tank (2), and a chemical liquid tank discharge pipe on / off valve (28) for opening and closing the chemical liquid tank discharge pipe (59), All of the plurality of branch pipe opening / closing valves (23, 24, 25, 26, 27) State during only the chemical tank discharge line off valve (28), characterized in that the an open state.

In the first aspect of the present invention, when the chemical solution is sprayed, all or part of the branch pipe on-off valve is opened. Then, the chemical tank discharge pipe opening / closing valve is closed. Thus, the chemical liquid in the chemical liquid tank is sent to the spray nozzle through the pump, the discharge pipe, the branch pipe on-off valve, and the branch pipe, and the chemical liquid is ejected from the spray nozzle.
In order to stop the injection from all the spray nozzles during the spraying operation of the chemical liquid, when all of the branch pipe on-off valves are closed, the chemical tank discharge pipe on-off valves are opened. Thereby, the chemical liquid in the chemical liquid tank is sent to the chemical liquid tank through the pump, the discharge pipe, the chemical liquid tank discharge pipe on-off valve and the chemical liquid tank discharge pipe, and as a result, the discharge pipe on the upstream side of the branch pipe on-off valve. The residual pressure in the road is removed.

  In the invention according to claim 1, when all of the branch line opening / closing valves are closed in order to stop the injection from all the spray nozzles during the spraying process of the chemical liquid, the chemical liquid tank discharge pipe Since the on-off valve is opened, the chemical liquid in the chemical tank is returned to the chemical tank via the chemical tank discharge pipe on-off valve and the chemical tank discharge pipe, so that the discharge pipe upstream of the branch pipe on-off valve Residual pressure can be removed. Therefore, for example, in an automatic pressure regulation system that maintains a constant pressure, or in a speed-linked spraying device that performs precision control, it is possible to prevent malfunction of a pressure sensor or the like.

  According to a second aspect of the present invention, there is provided the chemical spraying device according to the first aspect of the present invention, wherein the discharge pipe (44) has the pump upstream of the chemical tank discharge pipe on-off valve (28). A discharge side switching valve (18) for selectively connecting the discharge side of (30) to the chemical liquid tank discharge pipe on-off valve (28) or the chemical liquid tank (2) is provided.

In the second aspect of the invention, when the chemical solution is sprayed, the discharge side switching valve connects the discharge side of the pump to the chemical solution tank discharge pipe on-off valve. Then, in the same manner as in the case of the invention of claim 1, the chemical solution spraying operation is performed.
As in the first aspect of the invention, during the spraying operation of the chemical liquid, in order to stop the injection from all the spray nozzles, when all of the branch pipe on-off valves are closed, the chemical liquid tank discharge pipe The road open / close valve is opened. As a result, the chemical liquid in the chemical liquid tank is sent to the chemical liquid tank via the pump, the discharge pipe, the discharge side switching valve, the chemical liquid tank discharge pipe open / close valve and the chemical liquid tank discharge pipe, and as a result, the branch line open / close valve and The residual pressure in the discharge line with the discharge side switching valve is removed.
On the other hand, when the discharge side switching valve connects the discharge side of the pump to the chemical liquid tank, the chemical liquid pressure-fed to the discharge pipe flows into the chemical liquid tank.

  In the invention according to claim 2, the discharge side of the pump is opened / closed at the upstream side of the chemical tank discharge pipe on / off valve of the discharge pipe, and therefore the upstream side of the branch pipe on / off valve. Since there is a discharge side switching valve that is selectively connected to the valve or chemical tank, if you want to stop the injection from all the spray nozzles during the spraying process of the chemical, you can turn Instead of the closed state, the discharge side switching valve can be switched to connect the discharge side of the pump to the chemical tank.

  In addition, in the invention according to claim 1 or 2, the chemical liquid spraying device according to claim 3 is provided on the chemical liquid tank (2) side of the chemical liquid tank discharge pipe (59) with the chemical liquid tank ( 2) A nozzle (33, 34) capable of stirring the chemical solution in the inside is provided.

  According to a third aspect of the present invention, when all of the branch line opening / closing valves are closed in order to stop the injection from all the spraying nozzles during the spraying operation of the chemical liquid, Is opened, and the chemical liquid in the chemical liquid tank is sent to the nozzle through the chemical liquid tank discharge pipe opening / closing valve and the chemical liquid tank discharge pipe, and is injected into the chemical liquid tank from this nozzle to stir the chemical liquid. Stirring performance can be improved.

  In addition, the chemical spraying device according to claim 4 pumps the chemical tank (2) for storing the chemical, the cleaning liquid tank (16) for storing the cleaning liquid, and the chemical tank (2) or the cleaning liquid tank (16). A suction side switching valve (21) selectively connected to the suction side of (30), a discharge pipe (44) connected to the discharge side of the pump (30), and a branch from the discharge pipe (44) A plurality of branch pipes (45, 46, 47, 48, 49), spray nozzles (9) respectively connected to the branch pipes (45, 46, 47, 48, 49), A plurality of branch line opening / closing valves (23, 24, 25, 26, 27) for opening and closing the branch lines (45, 46, 47, 48, 49), respectively, and a cleaning nozzle (33, 34), the discharge pipe (44) and the cleaning nozzle A chemical liquid tank discharge pipe (59) for connecting (33, 34) and a chemical liquid tank discharge pipe on-off valve (28) for opening and closing the chemical liquid tank discharge pipe (59). The chemical tank discharge pipe on / off valve (28) is opened only when all the pipe on / off valves (23, 24, 25, 26, 27) are closed.

  In a fourth aspect of the invention, when the chemical tank is washed, the washing tank is connected to the suction side of the pump by the suction side switching valve, and all the branch pipe opening / closing valves are closed. Then, since all the branch line opening / closing valves are closed, the chemical tank discharge pipe opening / closing valves are opened. As a result, the cleaning liquid in the cleaning liquid tank is sent to the cleaning nozzle through the suction side switching valve, pump, discharge pipe, chemical liquid tank discharge pipe on-off valve, and chemical liquid tank discharge pipe, and from this cleaning nozzle to the chemical liquid tank. The chemical liquid tank is washed and sprayed.

  Further, when cleaning the liquid supply path of the chemical liquid, the cleaning liquid tank is connected to the suction side of the pump by the suction side switching valve, and all or part of the branch pipe opening / closing valve is opened. Then, the chemical tank discharge pipe opening / closing valve is closed. Thereby, the cleaning liquid in the cleaning liquid tank is sent to the spray nozzle through the suction side switching valve, the pump, the discharge pipe, the branch pipe open / close valve and the branch pipe, and the cleaning liquid is jetted from the spray nozzle, and as a result, the chemical liquid The liquid supply path is cleaned.

On the other hand, when the chemical solution is sprayed, the chemical solution tank is connected to the suction side of the pump by the suction side switching valve, and all or part of the branch pipe opening / closing valve is opened. Then, the chemical tank discharge pipe opening / closing valve is closed. Thereby, the chemical solution in the chemical solution tank is sent to the spray nozzle through the suction side switching valve, the pump, the discharge pipe, the branch pipe opening / closing valve and the branch pipe, and the chemical liquid is ejected from the spray nozzle.
In order to stop the injection from all the spray nozzles during the spraying operation of the chemical liquid, when all of the branch pipe on-off valves are closed, the chemical tank discharge pipe on-off valves are opened. Thereby, the chemical liquid in the chemical liquid tank is sent to the cleaning nozzle through the suction side switching valve, the pump, the discharge pipe, the chemical liquid tank discharge pipe on-off valve, and the chemical liquid tank discharge pipe, and from this cleaning nozzle to the chemical liquid tank. As a result, the residual pressure in the discharge line upstream of the branch line opening / closing valve is removed.

In the invention according to claim 4, the chemical tank can be washed by switching the suction side switching valve and closing all the branch line opening / closing valves, and further the branch line opening / closing valve. If all or part of the channel is opened, the chemical solution feeding path can be washed.
Also, during the spraying operation of the chemical liquid, if all of the branch pipe on-off valves are closed in order to stop the injection from all the spray nozzles, the chemical liquid tank discharge pipe on-off valve will be open. The chemical liquid in the tank is sent to the cleaning nozzle through the chemical liquid tank discharge pipe opening / closing valve and the chemical liquid tank discharge pipe, and is injected into the chemical liquid tank from this cleaning nozzle, so that the discharge pipe upstream of the branch line open / close valve The residual pressure in the road can be removed. Therefore, for example, in an automatic pressure regulation system that maintains a constant pressure, or in a speed-linked spraying device that performs precision control, it is possible to prevent malfunction of a pressure sensor or the like.

  According to a fifth aspect of the present invention, there is provided the chemical spraying device according to the fourth aspect of the invention, wherein the discharge pipe (44) has the pump upstream of the chemical tank discharge pipe on-off valve (28). A discharge side switching valve (18) for selectively connecting the discharge side of (30) to the chemical liquid tank discharge pipe on-off valve (28) or the chemical liquid tank (2) is provided.

In the invention according to claim 5, in any of the cleaning of the chemical liquid tank, the cleaning of the liquid supply path of the chemical liquid, and the spraying operation of the chemical liquid, the discharge side switching valve is used to connect the discharge side of the pump to the chemical liquid tank discharge pipe. Connect to the road valve. Then, in the same manner as in the case of the invention of claim 4, the chemical tank cleaning, the chemical solution feeding path, and the chemical solution spraying operation are performed.
Similarly to the invention according to claim 4, when all of the branch pipe opening / closing valves are closed in order to stop the injection from all the spray nozzles during the spraying of the chemical liquid, the chemical tank discharge pipe The road open / close valve is opened. Thereby, the chemical liquid in the chemical liquid tank is sent to the cleaning nozzle through the suction side switching valve, the pump, the discharge pipe, the discharge side switching valve, the chemical liquid tank discharge pipe open / close valve, and the chemical liquid tank discharge pipe. Is injected into the chemical tank, and as a result, the residual pressure in the discharge line between the branch line opening / closing valve and the discharge side switching valve is removed.
On the other hand, when the discharge side of the pump is connected to the chemical liquid tank by the discharge side switching valve, the chemical liquid or the cleaning liquid pumped to the discharge pipe flows into the chemical liquid tank.

In the fifth aspect of the present invention, the chemical tank can be cleaned and further branched by switching the suction side switching valve and the discharge side switching valve and closing all the branch pipe on / off valves. If all or a part of the pipe opening / closing valve is opened, the chemical solution feeding path can be washed.
Also, during the spraying operation of the chemical liquid, if all of the branch pipe on-off valves are closed in order to stop the injection from all the spray nozzles, the chemical liquid tank discharge pipe on-off valve will be open. The chemical liquid in the tank is sent to the cleaning nozzle via the chemical liquid tank discharge pipe opening / closing valve and the chemical liquid tank discharge pipe, and is injected into the chemical liquid tank from this cleaning nozzle. It is possible to remove the residual pressure in the discharge pipe between the two.
In addition, the discharge side of the pump is selectively connected to the chemical tank discharge pipe on / off valve or the chemical tank on the upstream side of the chemical tank discharge pipe on / off valve of the discharge pipe, and thus on the upstream side of the branch pipe on / off valve. Discharge side switching valve is provided, so if you want to stop the injection from all the spray nozzles during the spraying of the chemical solution, instead of closing all of the multiple branch line open / close valves, discharge This can be done by switching the side switching valve to connect the discharge side of the pump to the chemical tank.

  Further, in the chemical spraying device according to claim 6, in the invention according to claim 4 or 5, the cleaning nozzle (33, 34) is also used for stirring the chemical in the chemical tank (2). It is characterized by that.

  According to the sixth aspect of the present invention, when all of the branch line opening / closing valves are closed in order to stop the injection from all the spraying nozzles during the spraying operation of the chemical liquid, Is opened, the chemical liquid in the chemical liquid tank is sent to the cleaning nozzle through the chemical liquid tank discharge pipe on-off valve and the chemical liquid tank discharge pipe, and is injected into the chemical liquid tank from this cleaning nozzle to stir the chemical liquid. The stirring performance of the chemical solution can be improved.

  Further, in the invention according to any one of claims 1 to 6, the chemical solution spraying device according to claim 7 is characterized by being mounted or self-propelled.

  In the invention according to claim 7, since the chemical solution spraying device travels, in order to stop the injection from all the spray nozzles in the spraying operation of the chemical solution, for example, when turning the headland, the branch line is opened and closed. Although the entire valve may be closed, in such a case, the residual pressure of the discharge pipe as described above can be removed. Therefore, when performing precise control, in a speed-linked spraying device, etc. It is possible to prevent malfunction of the pressure sensor or the like.

  Here, in each of the above claims, the number of spray nozzles connected to each branch pipe includes one case, a plurality of cases, or a group of nozzles. Moreover, the chemical | medical solution injected from a spray nozzle is not specifically limited, For example, a chemical | medical solution, nutrient solution containing a fertilizer, etc. are included. Further, the discharge pipe, the branch pipe and the chemical tank discharge pipe are constituted by, for example, a rigid pipe, a flexible hose, a pipe joint, and the like.

  In addition, the code | symbol in the bracket | parenthesis in the above has described the corresponding element in drawing conveniently, Therefore, this invention is not limited to description on drawing. The same applies to the description of “Claims”.

  According to the chemical solution spraying apparatus of the present invention, in the spraying operation of the chemical solution, all the branch pipe on-off valves of the branch pipes connected to the spray nozzles are closed, and the injection from all the spray nozzles is stopped. However, the residual pressure in the discharge line upstream of the branch line opening / closing valve can be removed. Therefore, for example, in an automatic pressure control system that maintains a constant pressure or a speed-linked spraying device for precise control, etc. Incorrect operation of the pressure sensor or the like can be prevented.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 12 are views showing a boom sprayer according to an embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a left side view, and FIG. 3 is a right side view. 4 is a rear view, FIG. 5 is a plan view, FIG. 6 is a view in which the chemical tank is cut in the left-right direction and viewed from the front side, and FIG. FIG. 8 is a rear view of the mixing tank unit, FIG. 9 is a cross-sectional view showing a part of FIG. 8 cut, and FIG. 10 is a piping system diagram showing the configuration of the piping. 11 and 12 are diagrams for explaining the relationship between the on-off valve (branch on-off valve) and the chemical tank discharge pipe on-off valve. FIG. 11 shows the case where any of the on-off valves is in the ON state. FIG. 12 is a circuit diagram showing a case where all the on-off valves are in the OFF state. 1 to 5, the left boom is not shown.

  As shown in FIG. 1 to FIG. 9, this boom sprayer (chemical solution spraying device) is a mounted boom sprayer and is mounted on the rear part of a tractor (not shown), and performs a spraying operation while traveling. . The boom sprayer includes a body frame 1, and the body frame 1 is provided with a chemical liquid tank 2 for storing a chemical liquid (medicine). In addition, a three-point link 3 is provided at the front portion of the body frame 1 and is mounted on the tractor using the three-point link 3. Further, a stand 4 is provided at the lower part of the body frame 1, and when the tractor is detached from the tractor, the stand 4 is used to stand up, and the stand 4 is folded when the tractor is mounted. In addition, a boom nozzle device 5 is installed at the rear of the machine body frame 1.

  The boom nozzle device 5 includes a center boom 6 provided on the body frame 1 so as to be movable up and down, and left and right side booms 7 connected to both ends of the center boom 6 so as to be swingable. A nozzle pipe 8 is attached to the center boom 6, and a plurality of nozzles (spraying nozzles) 9 are provided on the nozzle pipe 8 at substantially constant intervals. The side boom 7 is a sliding boom, and includes a first boom 10 and a second boom 11 provided on the outer side of the first boom 10. The second boom 11 is slidable along the length direction with respect to the first boom 10, and the entire side boom 7 can be expanded and contracted by this sliding movement. A nozzle pipe 12 and a nozzle pipe 13 are respectively attached to the first boom 10 and the second boom 11, and a plurality of nozzles (spray nozzles) 9 are arranged at almost constant intervals on each of the nozzle pipe 12 and the nozzle pipe 13. Is provided.

Near the center of the center boom 6 of the boom nozzle device 5, a mixing tank 15 for preparing a spraying chemical (medicine) is installed.
A cleaning liquid tank 16 for storing a cleaning liquid (cleaning water) is provided on the right side of the upper part of the chemical liquid tank 2.

  In addition, a pressure regulating valve 17, a main cock (discharge side switching valve) 18, and a residual water switching valve 19 are provided at the center of the left side surface of the chemical liquid tank 2, and a five-way switching valve (suction side switching valve) is provided at the bottom. 21 is provided. Further, a five-way water split valve 22 is provided at the lower part of the right side surface of the chemical liquid tank 2. The five-way diversion valve 22 includes five on-off valves (branch line on-off valves) 23, 24, 25, 26, and 27. A chemical liquid tank discharge pipe opening / closing valve 28 is provided on the right side surface of the chemical liquid tank 2 below the five-way water split valve 22.

  A reciprocating pump 30 is provided below the chemical tank 2. A gear device 31 is provided on the front side of the pump 30, and the input shaft of the gear device 31 projects forward and the output shaft projects rearward. Then, the input shaft of the gear device is connected to the PTO shaft at the rear of the tractor and is driven to rotate, and this rotational power is transmitted to the pump 30 via the output shaft of the gear device 31.

  Further, in the chemical liquid tank 2, a cleaning nozzle (nozzle) 33 protruding upward from the center portion of the bottom surface and a cleaning nozzle (nozzle) protruding toward the inside of the chemical liquid tank 2 from the central portions of the front surface and the rear surface, respectively. 34). When the pressure of the supplied liquid becomes equal to or higher than a predetermined pressure, the bottom cleaning nozzle 33 and the front and rear cleaning nozzles 34 rotate in a substantially horizontal direction and a substantially vertical direction, respectively, and eject the liquid in 360 degrees on all sides. It is a swivel type nozzle. In this embodiment, a total of three cleaning nozzles 33 and 34 are provided, but the number of nozzles to be installed may be set as appropriate. Further, the cleaning nozzles 33 and 34 are not swivel type, and may be of other types such as a type of simple injection.

Next, the boom sprayer piping system will be described with reference to FIG.
A manual five-way switching valve 21 is connected to a suction pipe 37 connected to the suction side of the pump 30 via a strainer 38. The five-way switching valve 21 is connected to the chemical liquid tank 2 by a chemical liquid suction line 39 and is connected to the cleaning liquid tank 16 by a cleaning liquid suction line 40. The cleaning liquid suction conduit 40 passes through the chemical liquid tank 2 on the way. The five-way switching valve 21 is connected to an external water supply source by external water supply pipes 41 and 42, respectively. Then, the chemical solution tank 2 and the suction side of the pump 30 are connected by switching the five-way switching valve 21 and connecting the chemical solution suction line 39 and the suction line 37, and the cleaning liquid suction line 40 and the suction pipe. The cleaning liquid tank 16 and the suction side of the pump 30 are connected by connecting the passage 37, and the external water supply pipes 41 and 42 are connected by connecting the external water supply pipes 41 and 42 and the suction pipe 37, respectively. The suction side of the pump 30 is connected to each other.

  A five-way water split valve 22 is connected to the discharge pipe 44 connected to the discharge side of the pump 30. The five-way diversion valve 22 includes five electric on-off valves 23, 24, 25, 26, and 27, and each of the on-off valves 23, 24, 25, 26, and 27 has a branch line 45. , 46, 4748, 49 are connected. The branch pipes 45, 46, 4748, 49 are connected to the left nozzle pipe 13, the left nozzle pipe 12, the central nozzle pipe 8, the right nozzle pipe 12, and the right nozzle pipe 13, respectively. Each of the nozzle pipes 13, 12, 8, 12, and 13 includes a plurality of nozzles.

  In addition, an electric pressure regulating valve 17, a main cock 18 including an electric three-way switching valve, and a flow rate sensor 50 including a differential pressure type are installed in the discharge pipe 44 in order from the upstream side (the pump 30 side). Yes. The residual water pipe 51 of the pressure regulating valve 17 is connected to the chemical liquid tank 2, and the residual water is returned to the chemical liquid tank 2. A surplus water switching valve 19 including a manual three-way switching valve is provided in the middle of the surplus water pipe 51, and the surplus water switching valve 19 is connected to the cleaning liquid tank 16 by a pipe 52. The pipeline 52 passes through the chemical tank 2 on the way.

  The main cock 18 is connected to the chemical liquid tank 2 by a return discharge conduit 53. The return discharge line 53 is connected to the chemical tank 2 after passing through the chemical tank 2 and exiting the chemical tank 2 afterwards. The return discharge pipe 53 is provided with a manual three-way switching valve 55 and an orifice 56 in order from the upstream side. The three-way switching valve 55 is connected to the mixing tank 15. A downstream of the orifice 56 is connected to a manual on-off valve 57 provided at the lower part of the mixing tank 15.

  The discharge pipe 44 between the main cock 18 and the flow sensor 50 and the cleaning nozzles 33 and 34 in the chemical tank 2 are connected by a chemical tank discharge pipe 59. The chemical liquid tank discharge line 59 is provided with a chemical liquid tank discharge line opening / closing valve 28 comprising an electric switching valve.

Next, the relationship between the open / close valves 23, 24, 25, 26, 27 of the five-way diversion valve 22 and the chemical tank discharge pipe open / close valve 28, that is, a plurality of open / close valves (branch pipe open / close valves) 23, 24, A means for opening the chemical tank discharge pipe opening / closing valve 28 only when all of 25, 26 and 27 are closed will be described.
11 and 12, switches 63, 64, 65, 66, and 67 are motors 73, 74, 75, 76, and 77 of the on-off valves 23, 24, 25, 26, and 27 of the five-way diversion valve 22, respectively. It is a switch for operating. The relay 68 is a relay for operating the motor 78 of the chemical tank discharge pipe opening / closing valve 28. The switch 69 is a switch for operating the motor 79 of the main cock 18.

As shown in FIG. 11, when one of the switches 63, 64, 65, 66, and 67 is turned on, the switch 63 is supplied from a 12V DC power source (power source) 60 as shown by an arrow (1). The divided current flows as shown by arrows (2) and (3). Then, since the current of the arrow (2) turns on the contact of the relay 68, the current is supplied from the DC power source 60 to the motor 78 of the chemical tank discharge pipe on / off valve 28 as shown by the arrow (4). 78 closes the chemical tank discharge pipe opening / closing valve 28. On the other hand, when the current indicated by the arrow (3) is supplied to the motor 73 of the on-off valve 23, the motor 73 opens the on-off valve 23. Since the other four switches 64, 65, 66, 67 are in the OFF state, the on-off valves 24, 25, 26, 27 are in the closed state. Further, since the switch 69 is in the ON state, the motor 79 of the main cock 18 switches the main cock 18 to connect the discharge side of the pump 30 to the chemical tank discharge pipe opening / closing valve 28.
As described above, when at least one of the switches 63, 64, 65, 66, and 67 is turned on, the contact of the relay 68 is turned on, so that the current from the DC power source 60 is indicated by the arrow (4). Is supplied to the motor 78 of the chemical liquid tank discharge pipe on / off valve 28, and the motor 78 closes the chemical liquid tank discharge pipe on / off valve 28.

  On the other hand, as shown in FIG. 12, when all the switches 63, 64, 65, 66, and 67 are turned off, for example, a 12V DC power source (power source) 60 supplies the switch 63 as shown by an arrow (1). The generated current flows as shown by the arrow (2) and is supplied to the motor 73 of the on-off valve 23, and the motor 73 closes the on-off valve 23. In the case of the other switches 64, 65, 66, 67, the motors 74, 75, 76, 77 similarly close the on-off valves 24, 25, 26, 27. Since no current is supplied to the coil of the relay 68 from anywhere and the contact is in an OFF state, the current is supplied from the DC power source 60 to the motor 78 of the chemical tank discharge pipe opening / closing valve 28 as shown by the arrow (3). Then, the motor 78 opens the chemical tank discharge pipe opening / closing valve 28 and connects the discharge pipe 44 to the chemical tank discharge pipe 59. Since the switch 69 is in the ON state, the motor 79 of the main cock 18 switches the main cock 18 to connect the discharge side of the pump 30 to the chemical tank discharge pipe opening / closing valve 28.

Next, the operation of the boom sprayer will be described with reference to FIG.
In the boom sprayer, when the chemical liquid tank 2 is cleaned, the five-way switching valve 21 is switched to connect the cleaning liquid tank 16 to the suction side of the pump 30. Further, the switch 69 for operating the main cock 18 is turned on, the main cock 18 is switched, and the discharge side of the pump 30 is connected to the five-way water dividing valve 22 side (see also FIG. 12). In addition, all the on-off valves 23, 24, 25, 26, and 27 of the five-way diversion valve 22 are turned off so that all the on-off valves 23, 24, 25 are turned off. , 26, 27 are closed. Then, no current is supplied from anywhere to the coil of the relay 68 for operating the chemical liquid tank discharge line opening / closing valve 28, and the contact is in the OFF state. Therefore, the motor 78 opens the chemical liquid tank discharge line opening / closing valve 28. The discharge pipe 44 is connected to the chemical tank discharge pipe 59 (see also FIG. 12). Thus, the cleaning liquid in the cleaning liquid tank 16 passes through the five-way switching valve 21, the pump 30, the discharge pipe 44, the pressure regulating valve 17, the main cock 18, the chemical liquid tank discharge pipe opening / closing valve 28, and the chemical liquid tank discharge pipe 59. The liquid is sent to the cleaning nozzles 33 and 34 and sprayed from the cleaning nozzles 33 and 34 into the chemical liquid tank 2 to clean the chemical liquid tank 2.

  Further, when cleaning the chemical solution feeding path, the five-way switching valve 21 is switched to connect the cleaning solution tank 16 to the suction side of the pump 30. Further, the switch 69 for operating the main cock 18 is turned on, the main cock 18 is switched, and the discharge side of the pump 30 is connected to the five-way water dividing valve 22 side (see also FIG. 11). Further, all or a part of the switches 63, 64, 65, 66, and 67 for operating the on-off valves 23, 24, 25, 26, and 27 of the five-way diversion valve 22 are turned on, and the on-off valves 23 and 24 are turned on. , 25, 26, and 27 are all or partly opened (see also FIG. 11; in FIG. 11, only the switch 63 is ON). Then, since the contact of the relay 68 is turned on, the motor 78 closes the chemical tank discharge pipe opening / closing valve 28. As a result, the cleaning liquid is ejected (sprayed) from the nozzle 9 connected to the branch pipes 45, 46, 47, 48, 49 of the open / close valves 23, 24, 25, 26, 27 that are in the open state. The liquid supply line for the chemical solution up to is washed. For example, in the case of FIG. 11, the cleaning liquid in the cleaning liquid tank 16 passes through the pump 30, the discharge pipe 44, the pressure regulating valve 17, the main cock 18, the flow sensor 50, the on-off valve 23, the branch pipe 45 and the nozzle pipe 13. Then, it is sent to the nozzle 9 and the cleaning liquid is ejected from the nozzle 9, and as a result, the liquid supply path of the chemical liquid to the nozzle 9 is cleaned.

  On the other hand, when the chemical solution is sprayed, the five-way switching valve 21 is switched to connect the chemical solution tank 2 to the suction side of the pump 30. The following is the same as in the case of cleaning the above-described liquid solution feeding path. That is, in the same manner as described above, the main cock 18 is switched, and the discharge side of the pump 30 is connected to the five-way diversion valve 22 side (the discharge pipe 44 remains unchanged). Further, in the same manner as described above, all or part of the on-off valves 23, 24, 25, 26, and 27 of the five-way diversion valve 22 are opened. Then, as described above, the chemical tank discharge pipe on / off valve 28 is closed. Thereby, the chemical | medical solution in the chemical | medical solution tank 2 respond | corresponds to the pump 30, the discharge conduit 44, the pressure regulation valve 17, the main cock 18, the flow sensor 50, and the open / close valves 23, 24, 25, 26, and 27 which have been opened. It is sent to the nozzle 9 through the branch pipes 45, 46, 47, 48, 49 and the nozzle pipes 13, 12, 8, 12, 13, and the chemical liquid is ejected (sprayed) from the nozzle 9.

  During the spraying operation of the chemical solution, for example, when turning the headland, in order to stop the injection from all the nozzles 9, the on / off valves 23, 24, 25, 26, When all 27 are closed, the chemical tank discharge pipe opening / closing valve 28 is opened in the same manner as when the chemical tank 2 is washed. Thus, the chemical liquid in the chemical liquid tank 2 passes through the five-way switching valve 21, the pump 30, the discharge pipe 44, the pressure regulating valve 17, the main cock 18, the chemical liquid tank discharge pipe opening / closing valve 28, and the chemical liquid tank discharge pipe 59. It is sent to the cleaning nozzles 33 and 34 and is injected into the chemical tank 2 from the cleaning nozzles 33 and 34. As a result, the residual pressure in the discharge pipe upstream of the on-off valves 23, 24, 25, 26 and 27 is removed. The In addition, the chemical solution is jetted from the cleaning nozzles 33 and 34 into the chemical solution in the chemical solution tank 2, whereby the chemical solution in the chemical solution tank 2 is agitated.

In addition, in order to prepare the sprayed chemical solution, the five-way switching valve 21 is switched to connect the external water supply pipe 41 connected to the external water supply source to the suction side of the pump 30. Further, the switch 69 for operating the main cock 18 is turned off, the main cock 18 is switched, and the discharge side of the pump 30 is connected to the return discharge line 53.
Next, the three-way switching valve 55 is switched to connect the return discharge pipe 53 to the mixing tank 15. Then, the pump 30 is operated and mixed from an external water supply source through the external water supply pipe 41, the pump 30, the discharge pipe 44, the pressure regulating valve 17, the main cock 18, the return discharge pipe 53, and the three-way switching valve 55. A predetermined amount of dilution liquid (water) is injected into the tank 15. After that, a predetermined amount of chemical solution (stock solution) is put into the mixing tank 15.

Next, the three-way switching valve 55 is switched to connect the return discharge pipe 53 to the chemical tank 2. Then, the pump 30 is operated, and the chemical solution is supplied from an external water supply source through the external water supply pipe 41, the pump 30, the discharge pipe 44, the pressure regulating valve 17, the main cock 18, the return discharge pipe 53, and the three-way switching valve 55. A predetermined amount of dilution liquid (water) is injected into the tank 2.
Next, the five-way switching valve 21 is switched to connect the chemical tank 2 to the suction side of the pump 30. Then, the pump 30 is operated, and the dilution liquid (water) in the chemical liquid tank 2 passes through the pump 30, the discharge pipe 44, the pressure regulating valve 17, the main cock 18, the return discharge pipe 53, and the three-way switching valve 55. Return to the medicine tank 2 and circulate. While the dilution liquid (water) in the chemical liquid tank 2 is circulating, the on-off valve 57 at the bottom of the mixing tank 15 is opened. Then, the diluting liquid (water) in the chemical liquid tank 2 passing through the orifice 56 of the return discharge pipe 53 sucks the chemical liquid in the mixing tank 15, and this chemical liquid is sent into the chemical liquid tank 2.

  In the boom sprayer configured as described above, if the five-way switching valve 21 is switched and all the on-off valves 23, 24, 25, 26, 27 of the five-way diversion valve 22 are closed, the chemical solution The tank 2 can be washed, and if all or part of the on-off valves 23, 24, 25, 26, and 27 are opened, the chemical solution feeding path can be washed.

  Further, during the spraying operation of the chemical solution, for example, when the headland turns, all the on-off valves 23, 24, 25, 26, 27 of the five-way water split valve 22 are stopped in order to stop the injection from all the nozzles 9. Is closed, the chemical tank discharge pipe opening / closing valve 28 is opened, so that the chemical liquid in the chemical liquid tank 2 passes through the chemical liquid tank discharge pipe opening / closing valve 28 and the chemical liquid tank discharge pipe 59, and the cleaning nozzle 33, 34, and is injected into the chemical tank 2 from the cleaning nozzles 33, 34, and therefore, discharge between the five-way water dividing valve 22 (open / close valves 23, 24, 25, 26, 27) and the main cock 18 is performed. Residual pressure in the pipe 44 can be removed. Therefore, for example, in an automatic pressure regulation system that maintains a constant pressure or a speed-linked spraying device for precise control, it is possible to prevent malfunctions of the flow sensor 50, the pressure sensor, and the like.

  Moreover, if all the on-off valves 23, 24, 25, 26, and 27 of the five-way diversion valve 22 are closed in order to stop the injection from all the nozzles 9 during the spraying operation of the chemical liquid, the chemical liquid Since the tank discharge pipe opening / closing valve 28 is opened, the chemical liquid in the chemical liquid tank 2 is sent to the cleaning nozzles 33 and 34 via the chemical liquid tank discharge pipe opening / closing valve 28 and the chemical liquid tank discharge pipe 59, and this cleaning nozzle. Since the chemical liquid is agitated by being injected into the chemical liquid tank 2 from 33 and 34, the chemical liquid stirring performance can be improved. If the washing nozzles 33 and 34 are swivel washing nozzles, the stirring performance is further enhanced. Normally, a mechanical type stirring device is provided in the chemical tank 2 separately.

  In addition, the discharge side of the pump 30 is located upstream of the chemical tank discharge line on / off valve 28 in the discharge line 44, and thus on the upstream side of the on / off valves 23, 24, 25, 26, 27 of the five-way diversion valve 22. Since the main cock 18 that is selectively connected to the tank discharge pipe opening / closing valve 28 or the chemical liquid tank 2 is provided, when it is desired to stop the injection from all the nozzles 9 during the spraying operation of the chemical liquid, Instead of closing all of 24, 25, 26, and 27, the main cock 18 can be switched to connect the discharge side of the pump 30 to the chemical tank 2.

  In addition, since the mixing tank 15 for preparing the spraying chemical solution (medicine) is installed at substantially the center of the boom nozzle device 5 provided on the machine frame 1 so as to be movable up and down, the boom nozzle device 5 is moved up and down. Thus, since the height of the mixing tank 15 can be changed, when a chemical solution (raw solution) is introduced into the mixing tank 15, it is possible to perform an operation by selecting a position where the operator can easily work. Further, since the mixing tank 15 is installed above the nozzle 9, the mixing tank 15 is not covered with the chemical solution, and therefore, when the chemical solution (raw solution) is re-introduced, the operator can use the tank surface of the mixing tank 15. Will not touch the chemicals.

In the above-described embodiment, the cleaning liquid tank 16 and the pipe for cleaning are provided. However, even when these are not provided, all the nozzles 9 are used during the spraying operation of the chemical liquid, for example, when the headland turns. If all the on-off valves 23, 24, 25, 26, and 27 of the five-way diversion valve 22 are closed in order to stop the injection from the chemical tank, the chemical liquid tank discharge pipe on-off valve 28 is opened. The chemical liquid in the chemical liquid tank 2 is sent to the cleaning nozzles 33 and 34 through the chemical liquid tank discharge pipe opening / closing valve 28 and the chemical liquid tank discharge pipe 59, and is injected into the chemical liquid tank 2 from the cleaning nozzles 33 and 34. The residual pressure in the discharge pipe 44 between the five-way water dividing valve 22 (open / close valves 23, 24, 25, 26, 27) and the main cock 18 can be removed. Therefore, for example, in an automatic pressure regulation system that maintains a constant pressure or a speed-linked spraying device for precise control, it is possible to prevent malfunctions of the flow sensor 50, the pressure sensor, and the like.
In this case, the cleaning nozzles 33 and 34 may not be provided, and the chemical solution may be simply sent into the chemical solution tank 2, but a nozzle may be provided to perform stirring in the chemical solution tank 2.
In the above-described embodiment, the mixing tank 15 and the pipe line related thereto are provided, but this may be omitted.

  The present invention can be applied to various boom sprayers such as a self-propelled type in addition to an on-board type mounted on a tractor and the like. The present invention can also be applied to an apparatus provided with the above function, and can also be applied to a boom sprayer used in a golf course or the like in addition to a boom sprayer used in a paddy field or a farm field. Furthermore, the present invention can be applied to a chemical solution spraying apparatus including a nozzle other than the boom nozzle. Further, in addition to the chemical solution spraying device that can travel, the present invention can also be applied to a stationary chemical solution spraying device that does not travel.

It is a figure which shows the boom sprayer which concerns on embodiment of this invention, Comprising: It is a front view. FIG. FIG. FIG. FIG. It is the figure which cut | disconnected the chemical | medical solution tank in the left-right direction and saw it from the front side. It is the figure which cut | disconnected the chemical | medical solution and saw it from diagonally forward. It is a rear view of a mixing tank part same as the above. FIG. 9 is a cross-sectional view showing a part of FIG. It is a piping system diagram which shows the structure of piping similarly. FIG. 5 is a diagram for explaining the relationship between the on-off valve (branch on-off valve) and the chemical tank discharge pipe on-off valve, and is a circuit diagram showing a case where any one of the on-off valves is in an ON state. FIG. 6 is a diagram for explaining the relationship between the on-off valve (branch on-off valve) and the chemical tank discharge pipe on-off valve, and is a circuit diagram showing a case where all the on-off valves are in the OFF state.

Explanation of symbols

2 Liquid tank 9 nozzle (spray nozzle)
18 Main cock (Discharge side switching valve)
21 Five-way switching valve (suction side switching valve)
23, 24, 25, 26, 27 On-off valve (branch line on-off valve)
16 Cleaning liquid tank 28 Chemical liquid tank discharge pipe on-off valve 30 Pump 33, 34 Cleaning nozzle (nozzle)
44 Discharge line 45, 46, 47, 48, 49 Branch line 59 Chemical liquid tank discharge line

Claims (7)

  A chemical tank (2) for storing a chemical, a discharge pipe (44) connected to the discharge side of the pump (30), and a plurality of branch pipes (45, 46) branched from the discharge pipe (44) , 47, 48, 49), a spray nozzle (9) connected to each branch pipe (45, 46, 47, 48, 49), and each branch pipe (45, 46, 47, 48). , 49) and a plurality of branch pipe on-off valves (23, 24, 25, 26, 27), and a chemical tank discharge pipe connecting the discharge pipe (44) and the chemical tank (2). (59) and a chemical tank discharge pipe on / off valve (28) for opening and closing the chemical tank discharge pipe (59), and the plurality of branch pipe on / off valves (23, 24, 25, 26, 27). ) Is closed only when the chemical tank discharge pipe on / off valve (28) is opened. On purpose made possible chemical spraying apparatus according to claim.   The discharge pipe (44) has an upstream side of the chemical tank discharge pipe on / off valve (28), and a discharge side of the pump (30) is connected to the chemical tank discharge pipe on / off valve (28) or the chemical tank. The chemical spraying device according to claim 1, further comprising a discharge side switching valve (18) that is selectively connected to (2).   A nozzle (33, 34) capable of stirring the chemical solution in the chemical solution tank (2) is provided on the chemical solution tank (2) side of the chemical solution discharge line (59). Claim | item 1 or the chemical | medical solution spraying apparatus of Claim 2.   A chemical tank (2) for storing chemical liquid, a cleaning liquid tank (16) for storing cleaning liquid, and an inhalation for selectively connecting the chemical liquid tank (2) or the cleaning liquid tank (16) to the suction side of the pump (30) Side switching valve (21), a discharge line (44) connected to the discharge side of the pump (30), and a plurality of branch lines (45, 46, 47 branched from the discharge line (44)) , 48, 49), a spray nozzle (9) connected to each branch pipe (45, 46, 47, 48, 49), and each branch pipe (45, 46, 47, 48, 49). ), A plurality of branch line opening / closing valves (23, 24, 25, 26, 27), washing nozzles (33, 34) for washing the inside of the chemical tank, the discharge line (44) and the above Chemical tank for connecting cleaning nozzles (33, 34) An outlet pipe (59) and a chemical tank discharge pipe opening / closing valve (28) for opening and closing the chemical tank discharge pipe (59), and the plurality of branch pipe opening / closing valves (23, 24, 25, The chemical liquid spraying device is characterized in that the chemical liquid tank discharge pipe opening / closing valve (28) is opened only when all of 26, 27) are closed.   The discharge pipe (44) has an upstream side of the chemical tank discharge pipe on / off valve (28), and a discharge side of the pump (30) is connected to the chemical tank discharge pipe on / off valve (28) or the chemical tank. The chemical liquid spraying device according to claim 4, wherein a discharge side switching valve (18) to be selectively connected to (2) is provided.   The chemical liquid spraying device according to claim 4 or 5, wherein the cleaning nozzle (33, 34) is also used for stirring the chemical liquid in the chemical liquid tank (2).   The chemical spraying device according to any one of claims 1 to 6, wherein the chemical spraying device is mounted or self-propelled.

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