JPH0661497B2 - Valve equipment for power spreaders - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a valve device of a power spreader for spraying powdery or granular materials such as agricultural chemicals.

(Prior Art) In this type of power spreader, a wind turbine is rotated by an engine to generate a pressurized air flow, and the pressurized air is discharged through a blower pipe, while a part of the pressurized air is discharged. It is supplied into the tank, and the powder or granules in the tank are agitated to give fluidity, and the powder or granules are air-transferred from the tank to the air blower pipe through the dust guide tube and sprayed from the nozzle at the tip of the air blower tube It is a thing.

In the above-mentioned power spreader, the pressurized air flow supplied from the wind turbine chamber to the tank in order to make the fluidity of the powder and granules in the tank good, to smoothly discharge, and to accurately control the discharge amount. A valve device for controlling the valve is extremely important.

As this valve device, for example, those described in JP-B-58-27793, JP-B-58-42045, JP-B-58-43965 and the like are known.

(Problems to be Solved by the Invention) In the one disclosed in Japanese Utility Model Publication No. 58-27793, since the valve seat of the valve is joined to the tapered surface, when the particles of the granular material are large, the space between the valve seats is large. There was a problem that the particles were clogged and the valve could not be closed completely. Further, in this valve, since the air flow passage supplied to the tank and the granular material flow passage discharged from the tank to the powder guide tube are the same passage, there is a problem in the dischargeability of the granular material. was there.

Further, since the one described in Japanese Utility Model Publication No. Sho 58-42045 cannot control the flow rate and the flow direction of the air supplied to the tank, an appropriate air flow according to the size of the granules used. It was not possible to create a product, and it lacked versatility.

Further, the one disclosed in Japanese Utility Model Publication No. 58-43965 has an opening / closing mechanism for the valve in the passage of the granular material, so that the chemical adheres to the opening / closing mechanism, which is a problem and the valve is in surface contact. However, there is a problem that the powder and granules are caught between the valve seats so that the valve cannot be completely sealed. Furthermore, in this valve device, the powder and granules must be temporarily lifted up and pushed through the inlet of the powder guiding tube opened upwards,
There was a problem with the dischargeability of powder and granules.

Therefore, the present invention solves the above problems, improves the fluidity of the powder and granules, improves the dischargeability, and further provides a valve device for a power spreader in which the discharge amount is accurately controlled. The purpose is to do.

(Means for Solving Problems) In order to achieve the above object, the present invention takes the following means. That is, a feature of the present invention is that the bottom of the powder or granular material storage tank is provided with a recess of an upper opening having a circular peripheral edge,
An outlet for powder or granular material is provided in the concave portion, and a cylindrical body protruding upward from a circular peripheral edge is provided in a central portion of the concave portion, and the cylindrical body communicates between the wind turbine chamber and the tank, and A valve shaft is vertically movably inserted through an axial center portion, and a main valve is attached to an upper end portion of the valve shaft. The main valve has an inner surface that covers a cylindrical upper portion with a predetermined gap, and a circular peripheral edge. A tapered outer surface that comes into contact with and separates from the main body, and between the cylinder and the main valve, a transfer air passage that guides the compressed air from the wind turbine chamber to the outlet of the granular material, and a stirring air that guides the air into the tank. And a passage is formed.

(Operation) According to the present invention, a part of the compressed air generated in the wind turbine chamber is supplied into the tank through the agitation air passage formed between the cylindrical body and the main valve, and the powder in the tank is discharged. The granules are agitated to provide flowability.

On the other hand, a part of the compressed air flow flows through the transfer air passage formed between the cylindrical body and the main valve to the powder and granular material outlet. The granular material stirred by this air flow is conveyed to the granular material outlet and discharged from the outlet. Since the outlet of the granular material is provided in the concave portion, the granular material flows downward, and the dischargeability becomes good.

In addition, the outer surface of the main valve is formed into a tapered surface and abuts on the circular peripheral edge of the recess, so that line contact is made in the closed state, and complete sealing is achieved without biting powder particles between the valves. . Further, by vertically moving the main valve, the interval between the tapered outer surface and the circular peripheral edge changes linearly, which facilitates the control of the discharge amount.

(Example) Hereinafter, the Example of this invention is described based on drawing.

As shown in FIG. 4, the power spreader 1 according to the present invention is of a backpack type and is mainly composed of a wind turbine casing 2, an engine 3, a powder / liquid tank 4, a blower pipe 5, and the like.

As shown in detail in the power spreader 1 in FIG. 1, the wind turbine casing 2 is formed in a spiral shape, and the inside thereof is a wind turbine chamber 6, and a wind turbine 7 is rotatably provided in the wind turbine chamber 6. It is provided. The wind turbine 7 is rotationally driven by the engine 3.

An opening 8 communicating with the wind turbine chamber 6 is provided at one side of the wind turbine casing 2, and the blower pipe 5 is detachably attached to the opening 8. An opening 9 communicating with the wind turbine chamber 6 is also provided in the upper part of the wind turbine casing 2, and a valve seat body 10 is attached to the opening 9. On the upper surface of this valve seat body 10, the lower end portion of the powder / liquid tank 4 is placed and fixed to form a tank bottom portion 11.

An upper opening medicine injection port 12 is opened at the top of the tank 4, and the injection port 12 is covered by a lid 13 so as to be openable and closable.
The lower end of the tank 4 is formed into a cylindrical shape, and a liquid outlet 14 is formed on one side surface thereof, and the outlet 14 is provided with a cap 15 which can be opened and closed. The lower portion of the tank 4, the valve seat body 10 and the wind turbine casing 2 are fixed together by bolts 16.

A concave portion 17 having an upper opening is formed in a central portion of the valve seat body 10 constituting the tank bottom portion 11, and a powder outlet 18 is formed in the concave portion 17. A powder guide tube 19 is detachably attached to the end of the powder outlet 18, and the tip end of the powder guide tube 19 enters the blower tube 5 and joins the blower passage in the blower tube 5. . A spraying device 20 is provided at the tip of the blower pipe 5 (see FIG. 4).

The opening peripheral edge of the concave portion 17 of the valve seat body 10 is formed into a circular peripheral edge 21, and the cylindrical body 22 is arranged at the center of the circular shape. The lower portion of the tubular body 22 penetrates the bottom of the recess 17 and projects into the wind turbine chamber 6 below, and the upper portion of the tubular body 22 projects above the circular peripheral edge 21. Then, the upper tank 4 and the lower windmill chamber 6 are communicated with each other by the tubular body 22, and the wind generated by the windmill 7 is supplied into the tank 4 through the tubular body 22. In order to smoothly introduce the living body into the cylindrical body 22, the cylindrical body
At the lower end of 22 is formed a notch 23 that opens upwind.

As shown in FIG. 3, a slit is formed at the upper end of the cylindrical body 22.
24 is provided, and the slit 24 is surrounded by a cylindrical peripheral surface 25 at the lower end portion of the tank 4 with a predetermined interval.

A valve shaft 26 having an upper, lower, lower shaft center is provided at the shaft center of the cylindrical body 22 so as to be vertically movable. The lower end of the valve shaft 26 is pivotally attached to a lever body 27, and the valve shaft 26 moves up and down by swinging the lever body 27 from the outside. The lever body 26 faces the wind turbine chamber 6 and is isolated from the inside of the tank 4 by the valve seat body 10.

The upper end of the valve shaft 26 projects upward from the upper end surface of the tubular body 22, and a screw 28 is formed on the projecting portion. A powder main valve 29 is detachably fixed to the upper end of the valve shaft 26 via a nut 30.

The powder main valve 29 has an inner surface 31 that covers the upper outer peripheral surface and the upper end surface of the cylindrical body 22 with a predetermined gap, and a tapered outer surface 32 that contacts the circular peripheral edge 21 of the recess 17 so as to be separable. Have.

As shown in FIG. 1, when the valve shaft 26 is moved upward, the lower end edge of the powder valve 29 is located above the slit 24 of the tubular body 22, and the compressed air from the wind turbine chamber 6 is delivered to the tubular body 22. It is supplied into the tank 4 through the upper end opening of the cylindrical body 22 and the slit 24. At this time, the compressed air from the upper end opening of the tubular body 22 is regulated by the inner surface of the powder main valve 29 and diverts its flow downwardly, becomes a downward flow and is discharged to the bottom of the tank, and is stored in the tank 4. The drug 33 in the form of powder or granules is discharged from the powder inside the recess 17.
It is transferred to 18, and the drug 33 is pushed out from the outlet 18.

That is, a transfer air passage A for guiding the compressed air to the powder outlet 18 is formed between the cylindrical body 22 and the main valve 29.

On the other hand, the compressed air discharged from the slit 24 is
It collides with the lower cylindrical peripheral surface 25 and changes its direction in the circumferential direction and upwards.
Changing to the downward direction, the medicine 33 in the tank 4 is stirred.

That is, an agitating air passage B for guiding the compressed air into the tank 4 is formed between the cylindrical body 22 and the main valve 29.

As described above, the powder main valve 29 divides the compressed air into the powder-conveying A and the agitating-B, and efficiently guides the medicine 33 to the powder guide tube 19.

On the other hand, when the valve shaft 26 is moved downward, the taper outer surface 32
The gap between the circular peripheral edge 21 and the circular peripheral edge 21 is gradually reduced, and the amount of the medicine 33 supplied to the powder guide tube 19 is reduced.

As shown in FIG. 2, when the powder main valve 29 is located at the lowermost position, the tapered outer surface 32 and the circular peripheral edge 21 come into contact with each other, so that the inside of the tank 4 and the inside of the recess 17 are completely separated from each other, and the cylindrical body 22 is separated from the cylindrical body 22. The supplied compressed air is discharged into the powder guide tube 19 without being supplied into the tank 4, and the drug in the tank 4 is no longer sprayed.

In the closed state of the valve shown in FIG. 2, the taper outer surface 32
Since the circular peripheral edge 21 and the circular peripheral edge 21 come into contact with each other by line contact, complete sealing is possible even when the powder of the medicine 33 is large and vice versa, compared with the case of surface contact.

What is shown in FIGS. 5 to 9 is another embodiment of the present invention,
The structure of the powder main valve is different from that described above. That is, in this embodiment, the ventilation hole 43 is provided at the top of the powder main valve 42, and the ventilation hole 43 is used as the auxiliary valve 44.
It can be opened and closed by. As shown in FIG. 8, this auxiliary valve 44 is made of a spring steel plate and has three legs 45. The legs 45 come into contact with the top surface of the powder main valve 42 and the nut 30 keeps them from coming off. Has been done.

As shown in FIG. 5, in the valve open state, the auxiliary valve 44 opens the ventilation hole 43, and the compressed air is ejected upward from the ventilation hole 43.
Stir the powder effectively. That is, the ventilation hole 43 constitutes a part of the stirring air passage B. In the closed state,
The vent 43 is completely closed as shown in FIG.

Incidentally, in FIGS. 5 to 9, no slit is provided in the upper portion of the cylindrical body 22.

The present invention is not limited to the above embodiment.

(Effects of the Invention) According to the present invention, the fluidity of powder and granules is improved, the dischargeability is improved, and the discharge amount can be accurately controlled. Is effective.

[Brief description of drawings]

FIG. 1 is a sectional view for powder showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the relevant part, FIG. 3 is a perspective view showing a compressed air flow, and FIG. 5 and 5 are cross-sectional views showing another embodiment of the present invention, FIG. 6 is a cross-sectional view showing the same closed state, FIG. 7 is an enlarged cross-sectional view of the relevant part, and FIG. 8 is a plan view of an auxiliary valve. 9 is a sectional view taken along the line XI-XI in FIG. 1 ... Power spreader, 4 ... Powder / liquid combined tank, 6 ... Windmill chamber, 17 ... Recess, 18 ... Powder outlet, 21 ... Circular periphery,
22 …… Cylinder, 26 …… Valve shaft, 29 …… Main valve, 31
…… Inner surface, 32 …… Tapered outer surface, A …… Transport air passage, B
…… Agitation air passage.

Claims (1)

[Claims] 1. A cylinder which is provided with an upper opening concave portion having a circular peripheral edge at a bottom portion of a powder or granular material storage tank, the granular material outlet is provided in the concave portion, and which protrudes above the circular peripheral edge at a central portion of the concave portion. A body is provided, the cylinder communicates with the wind turbine chamber and the inside of the tank, the valve shaft is vertically movably inserted into the axial center of the cylinder, and the main valve is attached to the upper end of the valve shaft. Is worn
The main valve has an inner surface that covers the upper part of the cylindrical body with a predetermined gap and a tapered outer surface that contacts the circular peripheral edge so as to be freely separable, and a compression from the wind turbine chamber is provided between the cylindrical body and the main valve. A valve device for a power spreader, wherein a transfer air passage for guiding air to an outlet of the powder and granules and an agitation air passage for guiding air into the tank are formed.