JPH0517175Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a power sprayer for dispersing chemicals that is equipped with an engine, and when the chemical solution runs out during operation and the discharge pressure of the sprayer decreases, the invention automatically This invention relates to a configuration for stopping the engine and preventing dry running.

(b) Prior Art Conventionally, the technology regarding a power sprayer in which an engine and a sprayer are integrally set is known.

(c) Problems to be solved by the invention In the conventional technology, when the chemical solution runs out during spraying, the discharge pressure of the sprayer decreases, the engine runs dry, and fuel is wasted. be. The present invention automatically stops when this dry running occurs.

(d) Means for solving the problem In order to solve the problem, the present invention is constructed as follows.

In a power sprayer in which an engine 3 and a sprayer 4 driven by the engine 3 are fixed on a base 2, an automatic stop device 16 is provided to automatically stop the engine 3 when the discharge pressure of the sprayer 4 decreases. The automatic stop device 16 includes a starting switching lever 43 that is operated by the operator to the "starting side" at the time of starting, and a starting switching lever 43 that enables the engine 3 to rotate when the discharge pressure of the sprayer 4 is above a certain pressure. An automatic stop micro switch 25 stops rotation of the engine 3 when the discharge pressure of the sprayer 4 decreases, and the automatic stop microswitch 25 is pressed when the discharge pressure of the sprayer 4 is above a certain level, and the discharge pressure of the sprayer 4 is reduced. It is constructed with a plunger 31 that releases the pressed state when the pressure decreases.

(e) Embodiment The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

Fig. 1 is a perspective view of a power sprayer equipped with the automatic stop device of the present invention, Fig. 2 is a front view of the automatic stop device, Fig. 3 is a side sectional view, and Fig. 4 is an assembled perspective view. Figure 5 is an electrical circuit diagram.

To explain the overall configuration with reference to FIG. 1, frames 1, 1 are erected on both sides of a base 2, and an engine 3 and a sprayer 4 are placed on the base 2. From the crankshaft of the engine 3 to the drive shaft 6 of the sprayer 4,
Power is transmitted by the pulley and V-belt inside the belt cover 77, and the plunger is reciprocated by the rotation of the drive shaft 6, which absorbs water from the suction port 7 and passes it through the nozzle from the hose 9 connected to the discharge port 8. It is then dispersed.

10 is an accumulator, 11 is a pressure adjustment dial, 12 is a pressure gauge, 13 is a safety valve reflex lever,
14 is a spillway.

Further, a fuel tank 5 is placed on the frames 1, 1, and movable wheels 15, 15 are provided at the front lower part.

Then, the automatic stop device 16 of the present invention is installed on the frame 1.
The other discharge port 17 and the joint section at the lower part of the automatic stop device 16 are connected to each other by a hose 18.

The automatic stop device 16 of the present invention is shown in FIGS.
As shown in Figure 4, the mounting brackets 22 are held between the frame 1 and the bolts 2
3, a stay 24 is fixed inside the case 21, and an automatic stop micro switch 25 is attached.

Further, an insertion hole 21a is formed in the lower surface of the case 21, into which the stop unit A is inserted.

The stop unit A is composed of a plunger receiver 30, a plunger 31, a spring case 32, a spring 35, etc. The plunger receiver 30 is inserted into the insertion hole 21a of the case 21 with the lower part as a joint part 30a, and the nut 20 is inserted into the case 2.
1, and the hose 18 is connected thereto.

In addition, by screwing the upper spring case 32,
A washer 33, a collar 34, and a spring 35 are installed inside and screwed onto the upper end of a spring case 32 with a cap 36, a plunger 31 is inserted from below, and the upper end is locked with a washer 37. Reference numeral 39 denotes an adjustment nut, which rotates the spring case 32 to raise and lower it, and locks with the adjustment nut 39 to adjust the spring pressure, thereby adjusting the pressure when the plunger 31 descends, that is, the engine stop pressure. This is possible.

On the other hand, a shaft 41 is installed horizontally in a cover 26 that covers the case 21, and a starting switching lever 4 is provided in the center.
3 and an arm 44 protruding from the pipe 42 are fitted onto the shaft 41 so as to be freely rotatable, and a starting switching lever 43 is provided in the opening 2 in the front surface of the cover 26.
It protrudes from 6a.

A locking spring 45 is attached to the inside of the cover 26 above the opening 26a, so that the switching lever 43 can be locked in the raised position at the time of starting. The arm 44
is protruded so as to come into contact with the contact 25a of the automatic stop micro switch 25 when the starting switching lever 43 is in the raised position.

When the engine 3 is a gasoline engine, it is started by a recoil starter, and as shown in FIG. 5, an ignition coil 46 is connected to an ignition plug 47 and an ignition control device 48, which are connected in parallel. The main switch 49 and the automatic stop micro switch 25 are connected in series.

The main switch 49 is attached to the side of the engine, is always open, and can be pressed during work to ground and stop the engine.
The automatic stop micro switch 25 is always “closed” and the engine cannot be started in that state.
By pressing the contact 25a, it becomes "open" and the engine can be started.

(f) Effect of the invention With this configuration, in the case of a gasoline engine, when the engine is stopped, the ignition control unit 48 is grounded via the automatic stop micro switch 25, and the engine cannot be started. When the hour switching lever 43 is rotated upward,
The starting switching lever 43 is locked by a locking spring 45 and stops at the raised position, while the arm 44 presses (ON) the contact 25a of the automatic stop micro switch 25 to maintain it in the "open" position. and the engine can be started.

When the engine is started and the discharge pressure of the sprayer 4 exceeds the set pressure, the plunger 31 rises and presses the contact 25a (ON), and also pushes up the arm 44 and sets the starting switching lever 43 to the locking spring 45. It resists and rotates downward.

In other words, the automatic stop microswitch 25 remains "open". If you wish to stop the engine during work, press the main switch 49 to ground the engine and stop the engine.

When the chemical solution runs out during work, the discharge pressure of the sprayer decreases, the plunger 31 descends, and there is nothing to press the contact 25a of the automatic stop micro switch 25, which becomes "closed" and grounded, stopping the engine. That's what I do.

(g) Effects of the invention With the above configuration, the invention provides the following effects.

First, the engine 3 can be started by operating the starting switching lever 43 to the "starting side" at the time of starting, and if the chemical solution runs out after that and the discharge pressure of the sprayer 4 decreases, Since the pressing force of the plunger 31 is reduced and the automatic stop microswitch 25 automatically stops the engine 3, the engine no longer runs idle.

Second, the configuration of the automatic stop device 16 is changed to include a starting switching lever 43 and an automatic stop micro switch 2.
5 and plunger 31, it was possible to have a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a power sprayer equipped with the automatic stop device of the present invention, Fig. 2 is a front view of the automatic stop device, Fig. 3 is a side sectional view, Fig. 4 is an assembled perspective view, and Fig. 5 is an electrical circuit diagram. 2...Base, 3...Engine, 4...Sprayer,
16...Automatic stop device, 25...Automatic stop micro switch, 25a...Contact, 31...Plunger, 43...Start switching lever, 44...Arm, 49...Main switch.

Claims (1)

[Scope of utility model registration request] In a power sprayer in which an engine 3 and a sprayer 4 driven by the engine 3 are fixed on a base 2, an automatic stop device 16 is provided to automatically stop the engine 3 when the discharge pressure of the sprayer 4 decreases. The automatic stop device 16 includes a starting switching lever 43 that is operated by the operator to the "starting side" at the time of starting, and a starting switching lever 43 that enables the engine 3 to rotate when the discharge pressure of the sprayer 4 is above a certain pressure. An automatic stop micro switch 25 stops rotation of the engine 3 when the discharge pressure of the sprayer 4 decreases, and the automatic stop microswitch 25 is pressed when the discharge pressure of the sprayer 4 is above a certain level, and the discharge pressure of the sprayer 4 is reduced. An automatic stop device for a power sprayer, comprising a plunger 31 that releases the pressed state when the pressure decreases.