JPS6232609Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power spraying device that is capable of automatically stopping the power device when it detects that the chemical solution in the drug tank has run out.

Conventionally, a power sprayer is a device that has a large spraying capacity and can spray chemicals on abundant crops in a wide area, and the configuration of a power sprayer is as follows:
The pump is driven by a power device such as a general-purpose engine, and the chemical liquid contained in the chemical tank is sucked up by its water suction hose and sprayed by a long spray hose. When spraying pesticides using such a power sprayer, it is common to spray at a location far away (for example, several tens of meters) from the location where the power sprayer is installed. When the chemical solution in the sprayer runs out, the operator must move from the work area to the location where the power sprayer is located and stop the power sprayer.

According to the above-mentioned working conditions, the pump will operate under no load from the time when the chemical solution in the chemical tank runs out until the time when the power unit is stopped. This is not preferable because it causes a decrease in the performance of the pump.

In view of the above-mentioned problems with power sprayers, the present inventor created the present invention in order to effectively solve such problems by providing an automatic stop mechanism to the conventional power sprayer, and the purpose of this invention is to is as follows.

The purpose of this invention is to use a power sprayer that operates a spray pump using a general-purpose engine, sucks up the chemical solution in the chemical tank, and uses a long spray hose to spray pesticides over a wide area. An object of the present invention is to provide a power sprayer that can automatically stop the engine that operates the pump when the chemical solution in the chemical tank runs out during spraying work.

The purpose of this invention is to make it possible to return the chemical solution remaining inside the pump etc. to the chemical tank with a simple operation without bothering the operator when the spraying work is finished due to automatic engine stop. The purpose of the present invention is to provide a power sprayer with a high efficiency.

An object of the present invention is to provide a power sprayer that is simple and convenient to use, reduces the effort involved in spraying work, and improves the work.

An object of the present invention is to provide a power sprayer that can achieve the above-mentioned objectives by only making slight changes to the configuration of the electrical system and other devices of the conventional device, and that can be manufactured easily and inexpensively.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of the power sprayer according to the present invention, in which block 1 is indicated by a two-dot chain line.
1 shows the configuration of an electrical system for operating a general-purpose engine (not shown) that is a power unit. The device 2 shown above the block 1 is a component of the main body of a power sprayer.

To describe the configuration of the electrical system, a spark plug 3 installed in a general-purpose engine is connected to the output part of a CDI unit 4 (capacitor discharge type ignition device),
Ignition power is supplied from the unit 4 to the spark plug 3. In the CDI unit 4, a high voltage for ignition is generated in the secondary coil of the ignition coil at the time of discharge by the charging/discharging action of a capacitor provided inside the unit. In the case of a general-purpose engine, the power source for charging the above-mentioned capacitor of the CDI unit 4 is an exciter coil 5 which generally has a power generation function, and the electricity converted into direct current from the exciter coil 5 is sent to the CDI unit 4. be provided.

In FIG. 1, the CDI unit 4 is provided with two conductors 6 and 7 for grounding, the conductor 6 is grounded in a straight line, and the conductor 7 is interposed with two switches 8 and 9 in series. When both switches 8 and 9 are turned on, the ground state is established. Details of the switches 8 and 9 will be described later.

The electrical equipment of the conventional general-purpose engine of this type of power sprayer was not provided with the switches 8 and 9 as described above, but instead provided with only one starting switch. Regarding the operation and stopping of the general-purpose engine, the engine can be operated when the conductor 7 is not grounded, and the engine is stopped when the conductor 7 is grounded. This is because the operation of the CDI unit 4 can be controlled by grounding or non-grounding by the conductor 7, and such a configuration is already known. In other words, when the starting switch connected to the conductor 7 is turned off, the engine is ready to operate, and when the starting switch is turned on, the engine is stopped.

In the present invention, the function of the starting switch is replaced by the switches 8 and 9, and the combination of on and off operations of the switches 8 and 9 causes the operation and automatic stop of the general-purpose engine as described later.

The switch 8 is a timer switch, and
It functions as a starting switch when the engine is started, and when the engine is started, the switch 8 is turned off in order to change the grounding state of the conductor 7 to the non-grounding state. After a certain period of time has elapsed, for example about one minute, it returns to the on state.

The switch 9 is a detection switch that is turned on or off depending on a specific physical condition, and in the embodiment shown in FIG. This is a pressure switch that turns off when the internal pressure is negative and turns on when the pressure is atmospheric.

Next, the configuration of the sprayer main body 2 will be described. The water suction hose 10 has a filter 10a at its tip for removing dust and the like from the spray pump 13 in a medicine tank 12 containing a medicine solution 11; A drain hose 14 is arranged so that each end can fully enter the medicine tank, while a long spray hose 15 with a nozzle 15a attached to its end is provided on the output side of the pump 13. There is. The pump itself has a function of feeding the chemical solution 11 to the spray hose 15 side by being operated by a general-purpose engine. So I started the general-purpose engine and pump 13.
When operated, the liquid medicine in the medicine tank 12 is sucked up by the water absorption hose 10, and the liquid medicine is sprayed through the spray hose 15 from its tip nozzle 15a.

One end of a tubular member 16 is connected to an appropriate point in the middle of the water absorption hose 10, and the other end of the tubular member 16 is connected to the switch 9. The pressure condition inside the hose 10 is transmitted to the switch 9. Since this pipe member 16 has the function of transmitting whether the inside of the water suction hose 10 is at negative pressure or approximately atmospheric pressure, it needs to be made of a material that can exhibit such a function. The role of the pipe member 16 is to determine whether or not the chemical liquid is flowing, depending on the pressure state in the chemical liquid flow path.
The purpose of the present invention is to transmit information related to pressure to the switch 9 in order for the switch 9 to detect whether or not the chemical liquid 11 exists in the chemical tank 12 during the operation of step 3. Therefore, the attachment location of one end of the pipe member 16 is not limited to the water suction hose 10, and it is also possible to attach it to an appropriate location, such as inside the pump 13 or the spray hose 15, for example.

Next, the operation and stopping of the power sprayer having the above configuration will be explained.

First, regarding starting the engine, when the switch 8, which is initially on, is turned off, the conductor 7 becomes open and ungrounded, making it possible to start the engine. At the same time as the engine is operated, the pump 13 is operated, and the liquid medicine 11 in the medicine tank 12 is sucked up by the suction hose 10 and sprayed through the spray hose 15 from its tip nozzle 15a. At this time, the chemical solution flows inside the suction hose 10, creating a negative pressure state, so that the switch 9, which was in the on state before the engine was started, is turned off at the same time as the engine is started. Therefore, even if the switch 8 is turned on after a certain period of time due to the timer action, the conductor 7 is kept ungrounded by turning off the switch 9, so that the engine operation will not be stopped.

The above-mentioned spraying operation continues, and when the chemical solution 11 in the chemical tank 12 eventually runs out, the pressure state in the water suction hose 10 becomes close to atmospheric pressure, so the switch 9 is turned on. When the switch 9 is turned on, the conductor 7 is closed and grounded, the function of the CDI unit 4 is stopped, the operation of the general-purpose engine is stopped, and as a result, the operation of the power sprayer 2 is automatically stopped. I will do it.

Further, by providing a manually operable switch 30 in parallel with the switch 9, it is possible to stop the spraying operation at an appropriate time using the switch 30. However, the switch 30 is a push button type switch that is always open except when it is operated.

In the automatic stop state described above, chemical liquid will remain inside the pump 13 etc., but this residual liquid can be extracted by turning the switch 8 off again, starting the engine, and operating the pump 13 in reverse. can. In this case, the switch 8 is turned on after a certain period of time due to its timer action, while the switch 9 remains on, so that the conductor 7 is grounded and the engine and pump 13 automatically stop operating. Further, the above-mentioned operation for extracting the remaining liquid can be performed in the same manner even when the spraying operation is manually stopped during the spraying operation.

FIG. 2 shows a second embodiment of the configuration for detecting when the chemical solution 11 in the drug tank 12 is used up. A magnet 18 is provided at a location, and the float 17 is disposed with its hole loosely fitted into a rod-shaped member 19 provided at the bottom of the medicine tank 12, and a lead, for example, is placed around the lower end of the rod-shaped member 19. A switch element 20 such as a switch is arranged. In such a configuration, when the chemical solution 11 decreases and the float 17 descends with the liquid level, and the switch element 20 is turned on by the magnet 18 at its lower end, the power sprayer 2 is turned on by the same action as the switch 9 described above. It becomes possible to stop the operation automatically.

It is also conceivable to provide a switch element having the same function as the switch 9, for example, below the medicine tank 12, which can detect an increase or decrease in the amount of medicine in the medicine tank as the weight of the medicine tank 12.

Although the content of the present invention has been clarified through the explanation of each of the above embodiments, the content of the present invention is not limited to the above embodiments, and it goes without saying that the design may be arbitrarily changed without departing from the gist thereof. It is.

For example, instead of using a timer switch as the switch 8, it would be possible to use a simple normally closed push-button switch, or a microcomputer or the like could be used to control the operation of the switch with just one switch. It is also possible to achieve the same object as the present invention by controlling as in the above embodiment.

As is clear from the above description, the present invention provides the following effects.

First, the power sprayer is configured to automatically stop the power unit when it detects that the chemical solution in the medicine tank has run out, which not only makes work easier, but also makes it more convenient to manage and maintain the sprayer equipment. High performance can be maintained for many years.

By automating the power sprayer, the overall operation can be improved and the convenience of the power sprayer can be further improved.

Furthermore, since it also has the conventional manual operation function, ease of handling is maintained at a high level.

In addition, when taking out the chemical solution remaining inside the pump, etc., all you have to do is turn on the switch, and it continues this work for a certain period of time and then automatically stops, so the work is simplified and does not require any effort on the part of the operator. can be done.

Further, according to the present invention, it can be realized by making some changes to a conventional power sprayer, and it can be manufactured easily and inexpensively.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall configuration diagram of a power sprayer, and FIG. 2 is a diagram of another embodiment of a detector for detecting the presence or absence of a chemical solution. In the drawing, 1 is an electrical system device, 3 is a spark plug, 4 is a CDI unit, 7 is a grounding conductor, 8 is a first switch, 9 is a second switch, 10 is a water absorption hose, 11 is a chemical solution, 12 is a liquid tank, 13 is a pump, 15 is a spray hose, 17 is a float, 18 is a magnet, and 20 is a reed switch.

Claims (1)

[Claims for Utility Model Registration] (1) A pump is operated by a power device, and by the action of the pump, the liquid in the tank is sucked up through the water suction hose and sprayed with a spray hose, and at the same time, the liquid is applied to the ignition device of the power device. In the power sprayer, the power unit is brought into operation by bringing it into an ungrounded state using a grounding conductor provided therein, and brought into a stopped state by bringing it into a grounded state. A power sprayer characterized in that a switch means for detecting that the liquid in the tank has run out and a second switch means for stopping the switch for turning off and grounding the conductor wire are connected in series. (2) The power sprayer according to claim 1, wherein the first switch means is a timer switch that is turned on after a certain period of time has passed after being turned off. (3) In the utility model registration claim 1, the second switch means is a pressure switch that is turned off at approximately atmospheric pressure and turned on at negative pressure in the passage through which the liquid flows. A power sprayer characterized by: (4) In claim 1 of the utility model registration claim, the second switch means is a reed switch turned on by a magnet, and a float equipped with a magnet is floated on the liquid surface, and when the float is lowered to its lowest point. A power sprayer characterized in that the reed switch is turned on by the magnet of the float.