JPS599710Y2 - Chemical metering device for chemical sprayer - Google Patents

Description

[Detailed description of the invention] The present invention is a medicine metering device for a medicine sprayer, and more specifically, a medicine metering device for a medicine sprayer, in particular, a medicine metering device that measures powder or granules (hereinafter simply referred to as medicine) in a medicine tank and supplies it to a ventilation passage. This invention relates to a chemical metering device for a sprayer.

Conventionally, as this type of metering device, a communication pipe is interposed between a drug tank and a ventilation passage to communicate the tank and the ventilation passage, and a metering valve is inserted from a disc into the communication pipe. A butterfly-shaped valve type is provided in which the metering valve is freely rotatable, and the opening area in the communication pipe is changed by the rotation of the metering valve to measure the amount, and a plurality of drug discharge holes are provided in the bottom wall of the drug tank. A metering valve is installed along the outer surface of the bottom wall to communicate between the tank and the ventilation passage, and has a plurality of valve holes corresponding to the discharge holes on the outside of the bottom wall of the tank. A slide valve type is known in which the metering valve is provided so as to be freely slidable and the opening area of the discharge hole is changed to adjust the amount by reciprocating the metering valve.

However, in the case of the butterfly valve system, the opening area changes greatly with respect to the operating stroke (rotation angle) of the metering valve, so it has the disadvantage that minute adjustments cannot be made smoothly.

In other words, it was difficult to adjust the tube so that it would not become clogged with medicine and allow a small amount of medicine to pass through smoothly.

In addition, in the case of the slide valve method, the gap between the metering valve and the outer surface of the bottom wall of the drug tank becomes clogged, making the movement of the metering valve heavy, making it difficult to perform metering operations easily. Moreover, since the opening area of the discharge hole changes in direct proportion to the stroke of the metering valve, there is a drawback that the metering operation lever must be moved a large distance when increasing the opening area.

The present invention was devised in view of the above points, and its purpose is to always be able to easily carry out metering operations, and to
It is an object of the present invention to provide a medicine dispensing device that can smoothly perform minute adjustment and can further increase the opening area of a communication part with a small stroke.

Therefore, the present invention is a chemical metering device for dispersing chemicals that measures the chemical in the chemical tank and supplies it to the ventilation passage, and the arm is pivoted near the passage between the tank and the ventilation passage. The tip of the arm is pivotally connected to one end of a metering valve that opens and closes the communication portion, and the other end of the metering valve is
The metering valve is supported near the communication portion so as to be freely movable and rotatable along a predetermined radius of curvature, and the metering valve can be moved and rotated along the radius of curvature by rotating the arm. That is.

Embodiments of the present invention will be described below based on the drawings.

The illustrated drug dispensing device supports a blower device A on a backpack frame B from a pair of fan cases F1 and F2 containing a fan (not shown) and an engine E, and also supports the blower device A on a backpack frame B. A drug tank T is supported on the upper part, a ventilation passage C is provided outside the bottom wall of the tank T, and the medicine in the tank T is transferred from the communication part D between the tank T and the ventilation passage C to the ventilation passage C. This is applied to a backpack-type chemical sprayer that supplies the chemical agent and sprays it from the outlet of the ventilation passage, but it may also be used in other chemical sprayers that are mounted on or towed by a tractor.

In the figure, reference numeral 1 denotes a metering valve that opens and closes a communication part D, which has a through hole in the bottom wall of the tank T and connects the tank T and the ventilation passage C. It is made from a flat plate, and the first and second holes have pin holes at both ends.
Projecting pieces 1a and lb are provided.

Reference numerals 2 and 3 denote first and second arms that are pivotally connected to the fan case F1 near the communication portion D via first and second shafts 4 and 5, and these arms 2 and 3 are arranged at a predetermined interval. It is arranged in the ventilation passage C.

Of these arms 2 and 3, the first arm 2 is
The tip of the first arm 2 is shaped to be approximately twice as long as the arm 3, and the tip thereof is pivotally connected to the first protrusion 1a of the metering valve 1, and the metering is performed by rotating the first arm 2. While rotating the valve 1 along the radius of curvature R1 between the pivot center 01 of the first arm 2 and the pivot center 02 of the first arm 2 to the first projecting piece 1a, The tip of the second arm 3 is connected to the first arm.
The second projecting piece 1b of the metering valve 1 is pivotally attached to the tip of the second arm 3 so as to be oriented in a direction opposite to the tip of the arm 2, and the metering valve 1 is pivoted to the tip of the second arm 3. It is allowed to move and rotate freely along the radius of curvature R2 between the attachment center 03 and the pivot center 04 of the second arm 3 to the second projecting piece 1b.

Further, 6 is a lever rod that is attached to the tip of the first shaft 4 and rotates integrally with the first arm 2.
The distal end thereof is connected to a metering operating lever 8 via a connecting rod 7, and when the operating lever 8 is operated, the l-th arm 2 is rotated.

Further, the operating lever 8 is pivotally connected to the fan case F1 and is swung along a guide groove of a lever frame G attached to the backpack frame B.

In the figure, S is the throttle lever of the engine E, and H is the exhaust pipe.

The drug dispensing device of the present invention is constructed as described above, and when the first arm 2 is rotated clockwise in FIG. , the metering valve 1, and the second arm 3 through the second projecting piece 1b, and the second arm 3 rotates counterclockwise.
When the arm 2 is rotated counterclockwise in FIG. 2, the second arm 3 is rotated clockwise.

Accordingly, due to the rotation of the first and second arms 2 and 3, the pivot center 02 is displaced along the radius of curvature R1, and the pivot center 04 is displaced along the radius of curvature R2, and at the same time, the metering valve 1 However, as shown in the imaginary line in FIG. 2, the radius of curvature R1,
It moves and rotates along R2.

Due to this movement and rotation of the metering valve 1 along the radii of curvature R 1 and R 2 , the metering valve 1 rotates while moving in a direction away from the contact surface of the communication portion D with the metering valve. Therefore, the metering valve 1 can be operated smoothly at all times.

Further, when making minute adjustments, the opening area of the communicating portion D can be changed by moving the metering valve 1 in the direction along the communicating hole surface of the communicating portion D, so that minute adjustments can be made smoothly.

Furthermore, since the metering valve 1 can be operated by rotating the first arm 2, the opening area of the communication portion D can be increased with a small operation stroke.

In the above embodiments, the first and second arms 2 and 3 are used to operate the metering valve 1, but in other cases, the first arm 2 alone is used to operate the metering valve 1. You can do it like this.

In this case, a guide groove is formed with a predetermined radius of curvature on one of the second projecting piece 1b provided on the metering valve 1 and the fan case F1 or the drug tank T, and the other is engaged with the guide groove. A locking protrusion is provided to allow the metering valve to move and rotate along the radius of curvature of the guide groove by rotating the first arm 2.

As described above, in the present invention, an arm is pivotally attached near the communication part between the drug tank and the ventilation passage, and the tip of the arm is pivotally attached to one end of the metering valve, and the other end of the metering valve is pivotally attached. Since the metering valve is supported near the communication portion so as to be able to move and rotate freely along a predetermined radius of curvature, the metering valve can always operate smoothly, and the metering operation can be carried out easily.

However, since the change in the opening area of the connecting portion can be reduced during minute adjustments, the minute adjustments can be made more smoothly than with conventional butterfly valve systems.

Furthermore, since the metering valve is actuated by the rotational operation of the arm and moved and rotated along a predetermined radius of curvature, the opening area can be increased with a small operation stroke.

Therefore, it is easier to perform metering operations compared to the conventional slide valve type.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of an embodiment of the metering device of the present invention installed in a chemical sprayer, and FIG. 2 is a partially cutaway front view showing a portion of FIG. 1 enlarged. 1... Metering valve, 2... Arm, R2.
...curvature radius, C ... ventilation passage, D ...
...Communication department, T...Medical tank.

Claims (1)

[Scope of utility model registration request] A chemical metering device for a chemical sprayer that measures a chemical in a chemical tank and supplies it to a ventilation passage, comprising: an arm pivotally mounted near a communication portion between the tank and the ventilation passage; The distal end of the metering valve is pivotally connected to one end of a metering valve that opens and closes the communicating portion, and the other end of the metering valve is supported near the communicating portion so as to be freely movable and rotatable along a predetermined radius of curvature. A medicine metering device for a medicine sprayer, characterized in that the metering valve is moved and rotated along the radius of curvature by rotating the arm.