JPH0517178Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a device for remotely controlling a power sprayer used for spraying chemical solutions in fields, etc. using a radio controller. [Prior Art] In conventional power sprayers, the power sprayer is provided with an operating section that opens the discharge side of the pump to lower the discharge pressure or changes the output of the engine that drives the pump. Therefore, if a worker pulls out a long spray hose and performs spraying work at a location far from the power sprayer,
It is troublesome to go back to the power sprayer and lower the pump discharge pressure or engine output, and as a result, when spraying is interrupted and the sprayer is moved to another spraying location. In many cases, the engine is left running at high speed and the discharge side of the pump is left at a high pressure even when the pump is not required to forcefully pump a chemical solution, such as when taking a break or taking a break. This has the following disadvantages. (a) The high speed rotation of the engine increases wear on the cylinders, pistons, and other sliding parts of the engine, as well as increases consumption of fuel and lubricating oil. (b) Due to the high speed rotation and high discharge pressure of the pump,
Wear increases in sliding parts such as the pin gasket and seals of the pump, as well as water passage parts such as the valve body and seals of the pressure regulating valve, and the consumption of lubricating oil in the pump also increases. (c) High pressure is constantly applied to the spray hose, reducing its durability and service life. (d) Engines and pumps are constantly operating at high speeds, which increases noise. Therefore, in Japanese Utility Model Application Publication No. 61-48070, communication between the discharge side of the pump of the power sprayer and the return passage and the opening degree of the throttle valve of the engine that drives the pump are controlled by control commands from the radio controller. A power sprayer has been proposed that is controlled to reduce the discharge pressure of the pump of the power sprayer and at the same time reduce the output of the engine. [Problems to be solved by the invention] However, in the power sprayer proposed in Utility Model Application Publication No. 61-48070, etc., in order to lower the discharge pressure by opening the discharge side of the pump, A switching switch is used to switch the connection between the main line and the return passage, and the link mechanism for operating this switching link is complicated. The purpose of this invention is to simplify the structure of a remote control device for a power sprayer that controls the rotational speed of the engine and the discharge pressure of the pump by control commands from a radio controller by omitting the switching mechanism. [Means for solving the problem] According to this invention, a power sprayer includes an engine whose output is controlled by the opening degree of a throttle valve, a pump driven by the engine to pump fluid, and a pump that pumps fluid under pressure. and a pressure relief valve connected to the discharge side. The remote control device for such a power sprayer consists of a throttle valve operating member that is displaced to operate the throttle valve, a pressure relief valve operating member that is displaced to operate the pressure relief valve, and a pressure relief valve operating member that is displaced to operate the pressure relief valve. and a direct current motor that controls the displacement amount of the throttle valve operating member and the pressure relief valve operating member based on the commands received. [Operation] The operator sends control commands from the radio controller. In a power sprayer, a DC motor rotates based on control commands from a radio controller. This rotational displacement is transmitted to the pressure relief valve operating member and the throttle valve operating member, the pressure relief valve operating member and the throttle valve operating member are displaced, and the pressure relief valve and the throttle valve are controlled. The pressure relief valve controls the pump discharge pressure, and the throttle valve controls the engine output. [Example] This invention will be described below with reference to an example shown in the drawings. FIG. 8 is a schematic perspective view of the entire power sprayer. The power sprayer set 10 includes a power sprayer 16 mounted and fixed on a horizontally extending platform 14 attached to the lower part of the frame 12, and a spray hose 18 wound around the frame 12 so as to be rotatable. The hose reel 20 is rotatably supported by the hose reel 20.
The power sprayer 16 includes an engine 22 whose output is controlled by a throttle valve (not shown), and a pump 24 that is driven by the engine 22 and pumps the chemical solution. Engine 22 also drives hose reel 20. The receiver 26 has an antenna 28
It has a battery 30 and is attached to the upper part of the frame 12. The mounting plate 32 is attached to the upper part of the side surface of the frame 12, and has a DC motor 34 fixed thereto. The lever 36 rotates integrally with the throttle valve of the engine 22, and the throttle lever 3
8 is rotatably supported on the upper surface of the frame 12, and the lever 36 and the throttle lever 38 are connected to each other via a throttle wire 40. An operator can adjust the opening degree of the throttle valve of the engine 22 by manually operating the throttle lever 38. Hose alignment winding device 4
2 has a hose head 44 that is attached to the frame 12 above the hose reel 20 and reciprocates in the axial direction of the hose reel 20 in synchronization with the rotation of the hose reel 20. The spray hose 18 can be pulled out from the hose head 44. The radio controller 46 has an antenna 48 and an operation section for various commands. FIG. 9 is a structural diagram of a pressure regulating device 50 connected to the discharge side of the pump 24 (details of the pressure regulating device 50 are disclosed in, for example, Japanese Utility Model Application No. 60-41677). The pressure regulating device 50 includes a pressure regulating valve 54 and a pressure relief valve 56 housed in a common body 52,
The body 52 includes a connection port 58 connected to the discharge passage of the pump 24, a connection passage 60 communicating with the connection port 58, and a residual liquid port 62 connected to the return passage.
A leftover liquid passage 64 communicating with this leftover liquid port 62 is formed. In the pressure regulating valve 54, the valve body 66 is
The compression coil spring 68 controls the connection between the connection passage 60 and the residual liquid passage 64 by displacing in the axial direction, and the compression coil spring 68
is biased in the closing direction, and the handle 70
The compression coil spring 6 is arranged on the outside of the
Adjust the preload of 8. Valve body 7 of pressure relief valve 56
2 is displaced in the axial direction to control the connection between the connection passage 60 and the residual liquid passage 64, and one end of the valve rod 74 is connected to the valve body 7.
A compression coil spring 76 is integrally fixed to the valve body 2 and has its other end protruding outside the body 52. The compression coil spring 76 is fitted onto the valve stem 74 and urges the valve body 72 in the closing direction. The other end of the valve rod 74 is rotatably supported in a groove 78a of a cam 78 formed in a channel shape. FIG. 2 shows the operating section of the pressure regulating device 50 in the vicinity of the pressure regulating device 50. As shown in FIG. On the cam 78 side of the double-arm lever 84, a contact plate X that can come into contact with the back surface of the cam 78 is provided. Pressure relief valve link 82
consists of a double-arm lever 84 and a rod 86, and the double-arm lever 84 is integrally constructed with the cam 78 via the contact plate X, and the rotation of the double-arm lever 84 around the pin 80 is As the cam 78 moves,
rotate around pin 80. In addition, the rod 8
6 connects one end of the dual-arm lever 84 to a rod 96, which will be described later. 3 and 4 show different swing positions of the double-arm lever 84. of the throttle wire 88,
One end is hung on the other end of the double-arm lever 84, and the other end is locked on the lever 36 (FIG. 8). As shown in FIG. 3, when the rod 86 is pushing down the double-arm lever 84, the cam 78 is
The distance from the contact surface of the body 52 and the cam 78 to the pin 80 is large, and the amount of protrusion of the valve stem 74 outside the body 52 is large. Accordingly, the valve body 72 of the pressure relief valve 56 is separated from its valve seat, the discharge side of the pump 24 is opened to the return passage, and the discharge pressure of the pump 24 is reduced to approximately atmospheric pressure. Further, at this time, the throttle wire 88 is pushed toward the lever 36, and as a result, the opening degree of the throttle valve of the engine 22 decreases, and the rotational speed of the engine 22 decreases. As shown in FIG. 4, when the rod 86 is pulled in the direction of pulling up the double-arm lever 84, the cam 78, which is integrally formed with the double-arm lever 84, the pin 80, and the contact plate Rotate the valve stem 74
becomes short in the axial direction, and the body 52 and cam 7
The distance from the contact surface with pin 80 to pin 80 is small;
The amount of protrusion of the valve stem 74 out of the body 52 is small.
Therefore, the valve body 72 of the pressure relief valve 56 is seated on its valve seat, and the discharge pressure of the pump 24 becomes the value regulated by the pressure regulation valve 54 of the pressure regulation device 50. In this case, the throttle wire 88 is pulled toward the double-armed lever 84, and as a result, the opening degree of the throttle valve of the engine 22 increases, and the
The rotation speed of No. 2 increases. FIG. 1 shows the main parts of the throttle valve and pressure relief valve 56 of the engine 22. As shown in FIG. A bracket 90 is fixed to the pressure regulating device 50, and a covered portion of the throttle wire 88, which forms a part of the throttle valve link 89 , is fixed to the bracket 90. The small gear 92 is fixed to the drive shaft of the DC motor 34, and the large gear 94 is rotatably supported by the mounting plate 32 and meshes with the small gear 92 . Rod 9
6 has one end fixed to a central shaft that rotates integrally with the large gear 94 , and rotates integrally with the large gear 94 .
When the drive shaft of the DC motor 34 rotates, the large gear 9
4 rotates, the rod 86 reciprocates in the axial direction, and the double-arm lever 84 swings through the range of swing positions shown in FIGS. 3 and 4. The operation of the embodiment will be explained. When the worker moves to a different spraying location or takes a temporary break, the pump 24 does not need to pump the chemical solution. Therefore, the operator issues a command from the radio controller 46 to reduce the discharge pressure of the pump 24 and the rotational speed of the engine 22. This command is transmitted wirelessly to the receiver 26 of the power sprayer set 10, and the drive shaft of the DC motor 34 is rotated by a predetermined amount in a predetermined direction. As a result, the rod 86 of the pressure relief valve link 82 comes to the swinging position shown in FIG. 3, the pressure relief valve 56 of the pressure regulator 50 opens, and the opening degree of the throttle valve of the engine 22 decreases. , the pressure on the discharge side of the pump 24 decreases to approximately atmospheric pressure, and the rotational speed of the engine 22 also decreases.
When the operator resumes the spraying work, he similarly operates the radio controller 46 and issues a command to start pressure feeding the chemical solution from the pump 24. This results in
The drive shaft of the DC motor 34 rotates by a predetermined amount in a predetermined direction, the rod 86 of the pressure relief valve link 82 comes to the swinging position shown in FIG. 4, and the pressure relief valve 56 of the pressure regulator 50 closes. In addition, since the opening degree of the throttle valve of the engine 22 increases, the pressure on the discharge side of the pump 24 increases, and the rotational speed of the engine 22 also increases. FIGS. 5a and 5b are diagrams showing differences in the swinging position of the dual-arm lever 84 with respect to the rotation of the drive shaft of the DC motor 34 by varying the ratio of the number of teeth between the small gear 92 and the large gear 94. The double-arm lever 84 forms a part of the pressure relief valve link 82 and also forms a part of the throttle valve link 89 . In FIG. 5a, the gear ratio between the small gear 92 and the large gear 94 is 1:2.
Since the large gear 94 rotates 1/2 per rotation of the drive shaft of the DC motor 34, the double-arm lever 84 rotates for each rotation of the drive shaft of the DC motor 34.
moves to the end of the swing range. In FIG. 5b, the gear ratio between the small gear 92 and the large gear 95 is 1:4, and the large gear 95 rotates 1/4 of the rotation for one rotation of the drive shaft of the DC motor 34. DC motor 34
For each revolution of the drive shaft, the double-arm lever 84 moves by half of its swing range. In the pressure relief valve 56 of the pressure regulating device 50, if the valve body 72 moves away from the valve seat even a little, the pressure is relieved, and the double-arm lever 8
4 is in the intermediate swing position of FIG. 5b,
The pressure on the discharge side of the pump 24 is approximately atmospheric pressure. On the other hand, the throttle valve of the engine 22 changes its opening depending on the swinging position of the dual-arm lever 84. Therefore, regarding the control of the rotational speed of the engine 22 and the pressure on the discharge side of the pump 24, the fifth
In FIG. 5A, only two states can be set: a low speed and low pressure state and a high speed and high pressure state, whereas in FIG. 5B, a medium speed and low pressure state can be set. FIG. 6 shows another example of the dual-arm lever 84. A plurality of locking grooves 98 for locking the throttle wire 88 are formed at the end of the double-arm lever 84 on which the end of the throttle wire 88 is locked.
8 is latched into a selected latching groove 98. Depending on the position of the locking groove 98 in which the throttle wire 88 is latched, the amount of retraction or push of the throttle wire 88 at the swinging position of the double-arm lever 84 changes, so that the amount of retraction or push of the throttle wire 88 at the swinging position of the double-arm lever 84 changes, and the Rotation speed can be adjusted. FIG. 7 shows another embodiment. A throttle valve link 89 is provided in parallel to the rod 86. That is, the pressure relief valve 5 of the pressure regulating device 50
6 and engine 22, DC motors 34a, 34b , small gears 92a, 92b, large gears 94a, 94b, and rods 96a, 96b are provided separately, and the throttle wire 88 is latched onto the rod 96b. be done.
The DC motors 34a and 34b receive a drive signal from a common control signal output terminal 100. By setting the tooth ratio etc. separately with the pressure relief valve link 82 and the throttle wire 88, the opening degree of the throttle valve of the engine 22 relative to the opening and closing of the pressure relief valve 56 of the pressure regulator 50 can be adjusted as desired. . In FIG. 7, commands for opening/closing the pressure relief valve 56 of the pressure regulator 50 and the rotational speed of the engine 22 are sent from the radio controller 46 to the receiver 26 through one channel, but they are changed to two channels and adjusted. The opening and closing of the pressure relief valve 56 of the pressure device 50 and the rotational speed of the engine 22 can be independently controlled. When the operator finishes spraying the chemical solution and winds up the long drawn-out spray hose 18 onto the hose reel 20 of the power sprayer set 10, as the diameter of the spray hose 18 wound onto the hose reel 20 increases, , the circumferential speed at the part where the spray hose 18 is wound increases, and the winding speed becomes faster. 2 channels, pressure regulator 5
In the case of independently controlling the opening/closing of the pressure relief valve 56 and the rotational speed of the engine 22, the pressure regulator 50
With the pressure relief valve 56 open, the engine 22
Since the rotation speed of can be adjusted arbitrarily,
The winding speed of the spray hose 18 onto the hose reel 20 from the start of winding to the end of winding can be kept constant. [Effect of the invention] As described above, according to this invention, the DC motor operates based on the control command from the radio controller, and the operation of the DC motor releases pressure through the pressure relief valve operating member and the throttle valve operating member. The vent and throttle valves are operated so that the operator can control engine power and pump discharge pressure in the power sprayer from the radio controller without having to return to the power sprayer. Furthermore, the engine speed can be set in multiple stages depending on the number of teeth of the small gear attached to the drive shaft of the DC motor and the large gear that meshes with it, depending on the spraying work of chemicals, winding up of hoses, etc. It is possible to reduce the load on the engine at the same time. This invention does not use a switching device to open the discharge side of the pump to reduce the load on the pump and engine, so the configuration of the remote control device for the power sprayer can be simplified.

[Brief explanation of the drawing]

The drawings relate to an embodiment of this invention; Fig. 1 shows the main parts of the operating parts of the throttle valve and pressure relief valve of the engine, and Fig. 2 shows the operating part of the pressure regulating device in the vicinity of the pressure regulating device. , Figures 3 and 4 are diagrams showing different swinging positions of the double-arm lever, Figure 5a
and b are diagrams showing the difference in the swinging position of the double-arm lever with respect to the rotation of the drive shaft of the DC motor by changing the tooth ratio of the small gear and the large gear, and Fig. 6 is another example of the double-arm lever. 7 is a diagram showing another embodiment, FIG. 8 is a schematic perspective view of the entire power sprayer, and FIG. 9 is a structural diagram of a pressure regulating device connected to the discharge side of the power sprayer. It is. 16... Power sprayer, 22... Engine, 24
... pump, 34 ... DC motor, 36 ... lever (throttle valve operating member), 46 ... radio controller, 56 ... pressure relief valve, 78 ... cam (pressure relief valve operation member).

Claims (1)

[Claims for Utility Model Registration] (1) An engine 22 whose output is controlled by the opening degree of a throttle valve, a pump 24 that is driven by this engine 22 and pumps fluid, and which is connected to the discharge side of this pump 24. Pressure relief valve 56
A power sprayer having a throttle valve operating member 36 that is displaced to operate the throttle valve, a pressure relief valve operating member 78 that is displaced to operate the pressure relief valve 56, and a radio controller 46. A power sprayer comprising DC motors 34, 34a, and 34b that control the displacement amount of the throttle valve operating member 36 and the pressure relief valve operating member 78 based on received commands. remote control device. (2) The throttle valve operating member 36 and the pressure relief valve operating member 78 are controlled by a common DC motor 34, and when the pressure relief valve 56 is open, the opening degree of the throttle valve is reduced. A remote control device for a power sprayer according to claim 1, characterized in that: (3) The pressure relief valve link 82 is connected to the DC motor 3.
4 and the pressure relief valve operating member 78,
The remote control device for a power sprayer according to claim 2, wherein a throttle valve link 89 connects the pressure relief valve operating member 78 and the throttle valve operating member 36. (4) The pressure relief valve link 82 has a drive side gear 92 fixed to the drive shaft of the DC motor 34, and a driven side gear 94 that meshes with this drive side gear 92 , The drive side gear 92 and the driven side gear 9 are connected to the drive side gear 92 and the driven side gear 9 in order to adjust when the pressure release valve 56 starts operating to the link 89 .
4. A remote control device for a power sprayer according to claim 3, characterized in that the ratio of the number of teeth between 4 and 4 can be changed. (5) The throttle valve link 89 is a common member with the pressure relief valve link 82 , and includes a double-arm lever 84 in which a plurality of locking grooves 98 are formed, and the locking groove 4. The remote control device for a power sprayer according to claim 3, wherein the throttle opening degree of the engine can be adjusted by selecting 18 locking locations. (6) The power as set forth in claim 1 of the utility model registration claim, wherein the throttle valve operating member 36 and the pressure relief valve operating member 78 are independently controlled by separate DC motors 34b and 34a, respectively. Remote control device for spray machine. (7) The remote control device for a power sprayer according to claim 6, wherein the control commands from the radio controller 40 to the two DC motors 34a and 34b are sent through separate channels. .