JPH018703Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is an automatic engine stop for a power sprayer that senses when the chemical solution in the chemical tank of the power sprayer runs out and automatically stops the engine. It is related to the device.

[Conventional technology]

Generally, when spraying chemical liquid using a power sprayer driven by an engine, etc., the spray hose should be set at a distance of 100 m or more.
It may be extended to about 150 meters and performed on slopes or other locations with poor footing. However, in such cases, if the chemical solution in the chemical tank runs out during spraying, the sprayer must return to the machine position, and during this time the pump will run idly, causing abnormal heat generation and damage to the pump. There is a risk of

[Problem that the invention attempts to solve]

Therefore, conventionally, two or more workers were required to perform spraying work away from the power sprayer, and one of these workers had to constantly monitor the sprayer, which was very inefficient. It's becoming work.

[Means for solving problems]

This idea was developed in view of the above-mentioned circumstances, and in a power sprayer equipped with an engine stop circuit having an automatic return function, these devices are installed between the pump inlet and the suction pipe of the power sprayer. A conduit that is screwed to the suction port and the suction pipe, a swinging shaft that is rotatably installed in the pipe in a direction substantially orthogonal to the pipe axis and has one end protruding outward; a vane that is fixed in the conduit of the shaft and is swung by the passage of the liquid sucked by the pump; a guide plate that is attached to the conduit and is made of a conductive material and has a vertically long oblong hole bored therein; , a contact rod fixed to a protruding end of the swing shaft protruding from the conduit and pressed against one wall of the elongated hole via a spring; and the one of the elongated holes of the guide plate. A triangular swing pin pivotally attached to the center of the wall, and a locking protrusion that projects above the swing pin and limits the range of downward swing of the swing pin. and a contact plate, the base end of which is screwed onto the upper edge of the guide plate via an insulating plate, and the distal end of which protrudes into a recess in an inclined surface formed in the other wall of the oblong hole. The contact plate of the flow rate sensor is connected to the engine stop circuit via a cord, and the guide plate is grounded to the engine via a cord, and liquid passes through the conduit. When the blades swing, the contact rod moves upward along the side edge of the oblong hole, and when the liquid no longer passes through the conduit, the blades swing in the opposite direction. The power sprayer is characterized in that an operating switch is provided in the engine stop circuit so that the contact rod is moved downward along the upper edge of the swing pin as the engine moves, and the contact rod and the contact plate come into contact with each other. This provides an automatic engine stop device for aircraft.

〔Example〕

This invention will be described in detail below based on an embodiment shown in the accompanying drawings.

Fig. 1 is a side view of a power sprayer equipped with an automatic engine stop device according to this invention. In the figure, 1 is an engine, and on the side wall of this engine 1 is a device equipped with an automatic engine stop circuit with an automatic return function. A contact igniter 2 and a coil 3 are provided. The rotation of the engine 1 is transmitted to the crankshaft 5 of the pump 4 by a belt pulley, and the pump 4 is driven by the crankshaft 5. One end opening of a flow rate sensor 7 is removably connected to the suction port of the pump 4, one end of a water suction pipe 8 is connected to the other end opening of this flow rate sensor 7, and the other end of this water suction pipe 8 is connected to a chemical liquid tank. It is submerged in the chemical solution 10 in 9. Further, a valve 11 and a spill pipe 12 are connected to the discharge side of the pump 4. One end of a spraying hose 13 is connected to this valve 11, and a nozzle gun 14 is connected to the other end of the spraying hose 13, and the chemical solution 10 is sprayed from this nozzle gun 14. Note that when the spraying is temporarily interrupted, the chemical solution 10 inhaled by the pump 4
is returned into the chemical tank 9 through the spill pipe 12.

FIG. 2 is a front view of the flow rate sensor 7 according to this invention. FIG. 3 is a partially cutaway side view showing the same portion as FIG. 2. In FIG. 3, reference numeral 21 denotes a conduit, and this conduit 21 is screwed to the drug solution inlet of the pump 4 by means of a mounting member 22. Further, the water suction pipe 8 is screwed to the conduit 21 via a connecting member 23 . A swing shaft 25 is installed in the conduit 21 in a direction substantially perpendicular to the pipe axis, and one end of the swing shaft 25 projects outside the pipe 21.
A plate-shaped blade 26 is fixed to the portion located inside the conduit 21 of No. 5. On the other hand, a contact rod 27 is attached to the protruding end 25a of the swing shaft 25 protruding outside the conduit 21.
The proximal end of the contact rod 27 is fixed, and the distal end of the contact rod 27 passes through a vertically long oval hole 29 formed in a guide plate 28 attached to the conduit 21.

The contact rod 27 is connected to one side of the oblong hole 29 by a spring 30 and a washer 31 which are provided around the protruding end portion 25a and compressed between the proximal end of the contact rod 27 and the conduit 21. being pressed against the wall. A triangular swing pin 32 that can swing within a certain range is pivotally attached to the center of one wall of the oval hole 29 with its top projecting into the oval hole 29 . The swinging of the swing pin 32 is limited to a certain range by a locking protrusion 33 that projects above the swing pin 32. Further, in the other wall of the oblong hole 29 facing the swing pin 32, a recess 34 with an inclined surface is provided, and an insulating plate 3 is attached to the upper edge of the guide plate 28 in this recess 34.
The tip contact portion of the contact plate 36 which is screwed through the contact plate 5 protrudes and forms a contact point together with the contact rod 27.

This contact plate 36 is connected by a cord 37 to a non-contact ignition device 2 equipped with an engine stop circuit. On the other hand, the contact rod 27 is grounded to the engine 1 through a cord 38.

The engine stop circuit that can be used in this invention is
For example, there is a stop circuit shown in FIG. 2 of Japanese Patent Publication No. 54-44332. Figure 5 is a circuit diagram described in this publication, where TCL is a non-contact ignition circuit and ESS is an engine stop circuit with an automatic return function. In FIG. 5, PUT represents an N-gate thyristor, SCR represents a thyristor, TrC represents a transistor circuit, and P represents a spark plug. In order to utilize the circuit shown in FIG. 5 in this invention, a contact formed by the contact rod 27 and the contact plate 36 shown in FIG. 2 is used instead of the operating switch PS.

Since this invention has the above-described configuration, when spraying chemical liquid with the power sprayer according to this invention, the contact rod 27 and the vane 26 are in the positions shown by the solid lines in FIGS. 2 and 3, and as shown in FIG. In the circuit diagram shown in , the operating switch PS is in an open state, the engine stop circuit ESS is automatically reset, and the engine 1 is in a startable state.

The engine 1 is activated by a starter motor etc. (not shown).
When the pump 4 starts, the chemical solution 10 flows into the conduit 21 of the flow rate sensor 7 through the water suction pipe 8. Then, the blade 26 disposed inside this conduit 21
becomes substantially parallel to the flow of the chemical solution 10, and at the same time the contact rod 27 is lifted up to the upper part of the oblong hole 29 formed in the guide plate 28, as shown by the two-dot chain line in FIG. At this time, since the swing pin 32 shown in FIG. 2 rotates clockwise, the contact rod 27 rises upward without contacting the contact plate 36.

The chemical solution 10 that has passed through the conduit 21 is transferred to the spray hose 13
It is sprayed from the nozzle gun 14 through. When the spraying is interrupted by closing the valve 11 (shown in FIG. 1) during spraying, the chemical solution 10 is returned to the chemical solution tank 9 through the spill pipe 12, so that the flow in the conduit 21 remains constant. engine stop circuit
ESS does not work.

When all of the chemical solution 10 in the chemical solution tank 9 has been sprayed, the flow in the conduit 21 disappears, and the blade 26 shown in FIG. 3 returns to its original downward position due to its own weight, and the contact rod 27 also descends. I'll come.
At this time, as shown in FIG. 4, the swing pin 32 hits the locking protrusion 33 and cannot rotate counterclockwise, so the contact rod 27 moves laterally along the swing pin 32 and the contact plate After touching 36, it descends. This means that the operating switch PS shown in Figure 5 is momentarily closed, so the engine stop circuit
ESS is activated and engine 1 is stopped. Furthermore, since the engine stop circuit ESS has an automatic return function, the engine 1 becomes ready to start again after a certain period of time.

[Effect of idea]

As explained above, according to the automatic engine stop device of this invention, even when spraying from a distance from the power sprayer, there is no need to worry about damage to the power sprayer due to dry operation, so one worker can However, you can work with peace of mind. Also, chemical solution 1
Since the engine 1 automatically stops when 0 is exhausted, no gasoline is wasted and energy can be saved. Furthermore, conventional systems used floats or similar devices floating inside the chemical tank to sense the remaining amount of the chemical solution, which limited the location of the chemical tank.
In the device according to this invention, since the flow rate sensor 7 is provided at the water intake port of the pump 4, the chemical tank 9 can be placed at any position. Furthermore, since the flow rate sensor 7 is detachable, it has the advantage of being easily usable in ready-made power sprayers, and its utility value is remarkable.

[Brief explanation of the drawing]

Figure 1 is a side view of a power sprayer equipped with an automatic engine stop device according to this invention, Figure 2 is a front view of a flow rate sensor 7 according to this invention, and Figure 3 is similar to that shown in Figure 2. Fig. 4 is a partially enlarged front view showing the contacts shown in Fig. 2, and Fig. 5 is an engine stop circuit with an automatic return function that can be used with this invention. It is a circuit diagram of a non-contact ignition device provided with. In the figure, 4... pump, 7... flow rate sensor, 21... conduit, 25... rocking shaft, 26...
Blade, 27...Contact rod, 28...Guide plate, 29
...Oval hole, 32 ... Swing pin, 36 ... Contact plate, ESS ... Engine stop circuit, PS ... Operation switch.

Claims (1)

[Scope of Claim for Utility Model Registration] In a power sprayer equipped with an engine stop circuit having an automatic return function, an inlet of a pump 4 and a suction pipe 8 of the power sprayer.
A conduit 21 is screwed to the suction port and the suction pipe 8, and a conduit 21 is provided rotatably through the conduit 21 in a direction substantially orthogonal to the tube axis, with one end protruding outward. a swinging shaft 25, a vane 26 fixed to the conduit 21 of the swinging shaft 25 and swung by the passage of the liquid sucked by the pump 4; The proximal end is fixed to a guide plate 28 made of a conductive material having a circular hole 29 formed therein, and the protruding end 25a of the swing shaft 25 protruding from the conduit 21, and via a spring 30. a contact rod 27 that is pressed against one wall of the elongated hole 29; and a triangular swing pin that is pivotably pivoted to the center of the one wall of the elongated hole 29 of the guide plate 28. 32, a locking protrusion 33 that projects above the swing pin 32 and limits the range of downward swing of the swing pin 32, and the guide plate 28.
A contact plate 3 whose base end is screwed to the upper edge via an insulating plate 35, and whose distal end protrudes into a recess 34 on an inclined surface formed in the other wall of the oblong hole 29.
The contact plate 36 of the flow rate sensor 7 is connected to the engine stop circuit (ESS) through a cord 37, and the guide plate 28 is connected to the engine stop circuit (ESS) through a cord 38. When the engine 1 is grounded and liquid passes through the conduit 21, the contact rod 27 moves upward along the side edge of the oblong hole 29 due to the swinging of the blade 26, and the inside of the conduit 21 is moved upward. When the liquid no longer passes through the contact rod 27 as the blade 26 swings in the opposite direction, the contact rod 27 moves toward the swing pin 3.
The contact rod 2 is moved downward along the upper edge of the contact rod 2.
7 and contact plate 36 are in contact with each other (PS)
An automatic engine stop device for a power sprayer, characterized in that the engine stop circuit (ESS) is provided with: