Chemical spraying device

Abstract

To provide a chemical solution spraying device which can reduce the time and effort of maintenance of a strainer.SOLUTION: A feed water pump 22 of a chemical solution spraying device 100 is connected to a feed water hose 23 sequentially via a first channel switching part 25, a strainer 26 and a second channel switching part 27 from the feed water hose 23 side. A spray pump 21 is connected to a chemical solution tank 9 sequentially via the first channel switching part 25, the strainer 26 and the second channel switching part 27 from the chemical solution tank 9 side. The first channel switching part 25 can be switched between the state where the feed water hose 23 communicates to the strainer 26 and the state where the chemical solution tank 9 communicates to the strainer 26. The second channel switching part 27 can be switched between the state where the strainer 26 communicates to the feed water pump 22 and the state where the strainer 26 is connected to the spray pump 21.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a chemical solution spraying device. [Background technology]

[0002] Patent Document 1 discloses a speed sprayer as a chemical spraying device. In this chemical spraying device, chemical solution is sent from a chemical tank to a water distributor via a liquid supply valve, strainer, spray pump, and three-way cock, and then sent to a spray nozzle. Water is supplied to the chemical tank by a water supply pump connected to the strainer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-21775 Summary of the Invention [Problem to be solved by the invention]

[0004] In chemical spraying devices such as those described above, the strainer attached to the water supply pump is generally coarse, which is thought to make it easy for debris and other contaminants to get into the chemical tank. Furthermore, since the chemical spraying device requires a strainer for each of the water supply pump and the spray pump, the time required for strainer maintenance tends to increase.

[0005] One aspect of the present disclosure aims to provide a chemical spraying device that can reduce the effort required for strainer maintenance. [Means for solving the problem]

[0006] An example of a chemical liquid spraying device includes a chemical liquid tank (9) in which a chemical liquid is stored, a spray pump (21) that sucks out the chemical liquid stored in the chemical liquid tank (9), a water supply pump (22) that supplies water to the chemical liquid tank (9), and a water supply hose (23) that supplies water to the water supply pump (22). The water supply pump (22) is connected to the water supply hose (23) from the water supply hose (23) side via a first flow path switching unit (25), a strainer (26), and a second flow path switching unit (27) in this order. The spray pump (21) is connected to the chemical liquid tank (9) via a water supply hose (23) from the water supply hose (23) side. ) side to the chemical liquid tank (9) via a first flow path switching unit (25), a strainer (26), and a second flow path switching unit (27) in that order, and the first flow path switching unit (25) is switchable between a state in which the water supply hose (23) and the strainer (26) communicate with each other and a state in which the chemical liquid tank (9) and the strainer (26) communicate with each other, and the second flow path switching unit (27) is switchable between a state in which the strainer (26) and the water supply pump (22) communicate with each other and a state in which the strainer (26) and the spray pump (21) connect with each other.

[0007] In the chemical solution spraying device, the first flow path switching unit (25) connects the water supply hose (23) to the strainer (26), and the second flow path switching unit (27) connects the strainer (26) to the water supply pump (22), thereby connecting the water supply pump (22) to the water supply hose (23) via the strainer (26). This allows the water supply pump (22) to supply water filtered by the strainer (26) to the chemical solution tank (9). Furthermore, the first flow path switching unit (25) connects the chemical solution tank (9) to the strainer (26), and the second flow path switching unit (27) connects the strainer (26) to the spray pump (21), thereby connecting the spray pump (21) to the chemical solution tank (9) via the strainer (26). This allows the spray pump (21) to pump the chemical solution filtered by the strainer (26). In this manner, in the chemical solution spraying device, the chemical solution flowing into the spray pump (21) and the water flowing into the water supply pump (22) are filtered by a single strainer (26). This prevents an increase in the time required for maintenance of the strainer (26).

[0008] The strainer (26), for example, may have a mesh number in the range of 32 to 80. This configuration can effectively prevent dust and other particles from entering the chemical tank (9) when the water supply pump (22) supplies water to the chemical tank (9). [Effects of the Invention]

[0009] According to the chemical spraying device of the present disclosure, the effort required for strainer maintenance can be reduced. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing an example of a boom sprayer equipped with an example chemical spraying device. FIG. [Figure 2] FIG. 2 is a piping diagram of the chemical spraying device. DETAILED DESCRIPTION OF THE INVENTION

[0011] An example of an embodiment of the present disclosure will be described below with reference to the drawings. In the description of the drawings, identical elements are designated by the same reference numerals, and duplicated descriptions will be omitted. Note that, although the following description will focus on a boom sprayer including a chemical spraying device, the entire boom sprayer may also be considered as a chemical spraying device.

[0012] FIG. 1 is a perspective view of an example boom sprayer, viewed diagonally from the front. The boom sprayer 1 is a self-propelled riding cultivation machine used to spray liquids, such as chemicals, on agricultural land or crops in a field. The boom sprayer 1 includes a traveling body 3 having a machine frame and a boom device 4 attached to the front of the traveling body 3. The boom device 4 includes a lifting device 30 supported on the traveling body 3 and a boom section 40 supported on the lifting device 30. The boom section 40 includes a center boom 41 and a pair of side booms 43 located at both ends of the center boom 41. The center boom 41 and the side booms 43 each have a liquid supply pipe for spraying chemicals, which is equipped with multiple spray nozzles N. When spraying chemicals, the side booms 43 are deployed so as to be in a straight line with the center boom 41. As shown in FIG. 1, the side booms 43 are stored in a folded state when not spraying chemicals. The side boom 43 in the illustrated example is a multi-stage telescopic boom that is in an extended state when the boom is deployed and in a retracted state when the boom is stored.

[0013] A cabin 7 that forms a space where an operator is seated is provided at the front of the traveling body 3. An engine room 8 is provided at the rear of the traveling body 3. This engine room 8 is equipped with an engine (not shown) that serves as a drive source, a spray pump 21 (see FIG. 2), a water supply pump 2222 (see FIG. 2), etc. A chemical tank 9 that stores the chemical solution to be sprayed from the center boom 41 and the side booms 43 is provided between the cabin 7 and the engine room 8. The traveling body 3 includes a pair of front wheels 11 and a pair of rear wheels 12.

[0014] Figure 2 shows a piping system diagram of the chemical spraying device 100 in the boom sprayer 1. The example chemical spraying device 100 is composed of various pipes, equipment, etc. in addition to the chemical tank 9, spray pump 21, and water supply pump 22. In the chemical spraying device 100 shown in Figure 2, the chemical tank 9 is a tank in which the chemical liquid for spraying is stored, and is connected to a water supply system for supplying water to the chemical tank 9 and a spray system for spraying the chemical liquid in the chemical tank 9.

[0015] The water supply system connected to the chemical liquid tank 9 includes a water supply hose 23 and a water supply pump 22. The water supply hose 23 is a hose for drawing up water from a water source S. The water supply hose 23 is connected to the water supply pump 22 so as to be able to communicate with the water supply pump 22. The water supply pump 22 draws in liquid from an inlet and discharges it from an outlet. In one example, the inlet of the water supply pump 22 is connected to the water supply hose 23 via a first flow path switching unit 25, a strainer 26, and a second flow path switching unit 27 in this order from the water supply hose 23 side. The outlet of the water supply pump 22 is connected to the chemical liquid tank 9 via a supply line L1 constituted by a hose or the like.

[0016] The spray system connected to the chemical liquid tank 9 includes a spray pump 21 and a boom section 40. The spray pump 21 draws liquid from an intake port and discharges it from a discharge port. In one example, the discharge pressure of the spray pump 21 is greater than the discharge pressure of the feedwater pump 22, and the discharge flow rate of the spray pump 21 is smaller than the discharge flow rate of the feedwater pump 22. A main cock 32 equipped with a pressure regulating valve 31 for adjusting the spray pressure of the spray pump 21 is connected to the discharge port of the spray pump 21. Furthermore, the outlet side of the main cock 32 is connected to the spray nozzles N of the center boom 41 and the side boom 43 via a water divider 34. For example, the water divider 34 has a corresponding cock for each boom. In the illustrated example, the side boom 43 is divided into three sections: a first boom 43a, a second boom 43b, and a third boom 43c, and the main cock 32 is connected to the center boom 41 via the cock 34a of the water distributor 34, to the first boom 43a via the cock 34b, and to the second boom 43b and the third boom 43c via the cock 34c.

[0017] The main cock 32 is provided with a return line L2 for returning the chemical liquid to the chemical liquid tank 9, so that any chemical liquid not delivered to the boom section 40 returns to the chemical liquid tank 9. The return line L2 may be formed, for example, by a hose. The water divider 34 is provided with a pressure gauge 35. For example, the spray pressure by the pressure regulating valve 31 may be controlled based on the pressure detected by the pressure gauge 35 of the water divider 34. The water divider 34 may also include a strainer.

[0018] The suction port of spray pump 21 is connected to chemical tank 9 via first flow path switching unit 25, strainer 26, and second flow path switching unit 27 in this order from the chemical tank 9 side. As described above, first flow path switching unit 25, strainer 26, and second flow path switching unit 27 are also used in the water supply system. That is, first flow path switching unit 25 is connected to the inlet side of strainer 26, the outlet side of water supply hose 23, and the outlet side of supply line L3 connected to chemical tank 9, and second flow path switching unit 27 is connected to the outlet side of strainer 26, supply line L4 connected to the suction port of feedwater pump 22, and supply line L5 connected to the suction port of spray pump 21.

[0019] First flow path switching unit 25 is configured to be switchable between a water supply state in which water supply hose 23 and strainer 26 are connected to each other, and a spray state in which chemical tank 9 and strainer 26 are connected to each other. In the water supply state, chemical tank 9 and strainer 26 are not connected to each other, and in the spray state, water supply hose 23 and strainer 26 are not connected to each other. Second flow path switching unit 27 is switchable between a water supply state in which strainer 26 and water supply pump 22 are connected to each other, and a spray state in which strainer 26 and spray pump 21 are connected to each other. In the water supply state, strainer 26 and spray pump 21 are not connected to each other, and in the spray state, strainer 26 and water supply pump 22 are not connected to each other.

[0020] In one example, the first flow path switching unit 25 and the second flow path switching unit 27 may each be configured with a flow path switching valve such as a three-way cock (three-way switching valve). The strainer 26 may have a mesh number ranging from 32 to 80. The mesh number indicates the number of meshes formed within a length of 1 inch (25.4 mm).

[0021] As described above, one example of chemical solution spraying device 100 includes chemical solution tank 9 in which chemical solution is stored, spray pump 21 that sucks out the chemical solution stored in chemical solution tank 9, water supply pump 22 for supplying water to chemical solution tank 9, and water supply hose 23 for supplying water to water supply pump 22. Water supply pump 22 is connected to water supply hose 23 from the water supply hose 23 side via first flow path switching unit 25, strainer 26, and second flow path switching unit 27 in this order. Spray pump 21 is connected to chemical solution tank 9 from the chemical solution tank 9 side via first flow path switching unit 25, strainer 26, and second flow path switching unit 27 in this order. The first flow path switching unit 25 can be switched between a state in which the water supply hose 23 and the strainer 26 are connected to each other and a state in which the chemical tank 9 and the strainer 26 are connected to each other, and the second flow path switching unit 27 can be switched between a state in which the strainer 26 and the water supply pump 22 are connected to each other and a state in which the strainer 26 and the spray pump 21 are connected to each other.

[0022] In the chemical solution spraying device 100 described above, when both the first flow path switching unit 25 and the second flow path switching unit 27 are switched to the water supply state, water supply by the water supply pump 22 becomes possible. That is, the first flow path switching unit 25 connects the water supply hose 23 to the strainer 26, and the second flow path switching unit 27 connects the strainer 26 to the suction port of the water supply pump 22, thereby connecting the suction port of the water supply pump 22 to the water supply hose 23 via the strainer 26. In this state, by immersing the tip of the water supply hose 23 in the water source S and operating the water supply pump 22, water from the water source S is pumped up by the water supply pump 22 and stored in the chemical solution tank 9 connected to the discharge port of the water supply pump 22. The water pumped up by the water supply pump 22 then passes through the strainer 26.

[0023] Furthermore, in chemical solution spraying device 100, when both first flow path switching unit 25 and second flow path switching unit 27 are switched to the spray state, spraying (spraying) of chemical solution by spray pump 21 is possible. That is, first flow path switching unit 25 connects chemical solution tank 9 to strainer 26, and second flow path switching unit 27 connects strainer 26 to the suction port of spray pump 21, thereby connecting the suction port of spray pump 21 to the chemical solution tank via strainer 26. In this state, by operating spray pump 21 and opening cocks such as main cock 32, the chemical solution in chemical solution tank 9 passes through strainer 26, is pressure-fed by spray pump 21, and is sprayed from spray nozzle N of boom section 40.

[0024] In this way, in chemical solution spraying device 100, the chemical solution flowing into spray pump 21 is filtered by strainer 26, and the water flowing into water supply pump 22 is also filtered by strainer 26. Therefore, compared to when a strainer for spray pump 21 and a strainer for water supply pump 22 are separately provided, the increase in time required for strainer maintenance can be suppressed. Furthermore, by reducing the number of strainers, manufacturing costs can be reduced.

[0025] Furthermore, the chemical solution spraying device 100 has a water supply pump 22 for supplying water in addition to the spray pump 21. In this case, a pump with a large discharge flow rate, such as a so-called irrigation pump or monoflex pump, can be used as the water supply pump, thereby shortening the water supply time.

[0026] An example of the strainer 26 has a mesh number in the range of 32 to 80. When a strainer for the spray pump and a strainer for the feedwater pump are provided, as in the conventional case, the mesh of the strainer for the feedwater pump is generally set to be coarse. In this case, it is conceivable that debris that cannot be filtered by the strainer may get mixed into the chemical tank during the water supply process. As described above, when the strainer 26 having a mesh number in the range of 32 to 80 is used, the mixing of debris into the chemical tank 9 is suppressed.

[0027] Although one embodiment has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment.

[0028] For example, although a boom sprayer having a boom provided with a spray nozzle has been described, the chemical spraying device of the present disclosure can also be applied to a speed sprayer having a spray nozzle.

[0029] Furthermore, in the present disclosure, by sharing one strainer between the spray pump and the water supply pump, not only is the effort required for strainer maintenance reduced, but the strainer connected to the spray pump can also be effectively used for water supply work, for example. Therefore, although the above example shows a case in which no strainer is connected to the end of the water supply hose, for example, a coarse mesh strainer can be connected to the end of the water supply hose to draw water from the water source. [Explanation of symbols]

[0030] 1...Boom sprayer (chemical spraying device), 9...Chemical tank, 21...Spray pump, 22...Water supply pump, 23...Water supply hose, 25...First flow path switching unit, 26...Strainer, 27...Second flow path switching unit, 100...Chemical spraying device.

Claims

1. a chemical tank (9) in which a chemical is stored; a spray pump (21) for sucking out the chemical liquid stored in the chemical liquid tank (9); a water supply pump (22) for supplying water to the chemical tank (9); a water supply hose (23) for supplying water to the water supply pump (22); The water supply pump (22) is connected to the water supply hose (23) via a first flow path switching unit (25), a strainer (26), and a second flow path switching unit (27) in this order from the water supply hose (23) side; The spray pump (21) is connected to the chemical tank (9) via the first flow path switching unit (25), the strainer (26), and the second flow path switching unit (27) in this order from the chemical tank (9), the first flow path switching unit (25) is switchable between a state in which the water supply hose (23) communicates with the strainer (26) and a state in which the chemical liquid tank (9) communicates with the strainer (26); The second flow path switching unit (27) is switchable between a state in which the strainer (26) and the water supply pump (22) are in communication with each other and a state in which the strainer (26) and the spray pump (21) are connected to each other.

2. 2. The chemical spraying device according to claim 1, wherein the strainer (26) has a mesh number in the range of 32 to 80.

Images