JPH048100B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a device that applies vibration to a hopper containing fine powder or viscous fluid, etc., and extracts a minute amount of the contained material.

[Conventional technology]

Conventionally, for the purpose of surface treatment of articles, fine powder of several microns is taken out and welded to the surface of the article to form a film-like coating, or fine electromagnetic powder is attached in a film form to form an electromagnetic layer. , as shown in FIG. 4, a hopper a is attached to a diaphragm (not shown), fine powder is accommodated in the hopper a, and a take-out pipe b is connected to the bottom of the hopper a by applying vibration to the hopper a. It is already well known to extract a suitable amount of fine powder from.

However, in the past, the amount taken out was about 1/100 gram per second, so the upper end opening c of the take-out pipe b connected to the hopper a was an extension of the inside diameter of the take-out pipe b, and the take-out pipe b equal to the inner diameter of

[Problem that the invention seeks to solve]

According to the above-mentioned conventional technology, the powder often stagnates above the upper opening c or near the upper opening c of the take-out pipe b, forming a so-called bridge and blocking the flow of the powder.

In addition, recently there has been a demand to further reduce the amount of fine powder taken out, and to take out powder of several microns at about 1/1000 gram per second, and for this reason, the take-out tube of conventional equipment is unsuitable because the amount taken out is large. Therefore, if the inner diameter of the take-out tube is made smaller, there is a disadvantage that the phenomenon described above will cause the flow of the powder to be blocked even more frequently.

[Means for solving problems]

On the other hand, the present invention makes it possible to smoothly and continuously take out fine powder, etc. in a set minute amount per unit time, and uses a take-out pipe connected below a hopper attached to a vibration plate. It is characterized in that a minute opening is provided at the upper end, and a hole below the minute opening in the extraction tube has a larger diameter than the minute opening at the upper end.

[Effect]

In the present invention, when vibration is applied to the diaphragm, the fine powder flows little by little into the take-out tube from the small opening at the upper end of the take-out tube opened in the hopper and falls inside the tube.
The fine powder that flows into the tube from the small-diameter opening at the top end of the take-out tube immediately moves to the bottom of the take-out tube without causing any bridging at the top of the top opening of the take-out tube in the hopper due to the vibration action. Because the diffusion occurs within the enlarged pores, bridging does not occur even near the upper opening of the extraction tube, and there is no phenomenon in which fine powders gather together and flow is inhibited due to mutual contact resistance. After passing through the small-diameter opening, it smoothly flows downward through the take-out tube, which has a diameter larger than the opening size of the small-diameter opening at the upper end, and is taken out from the opening at the lower end.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the drawings, reference numeral 1 denotes a diaphragm consisting of a piezoelectric element 1b layered on a metal plate 1a, which is held via an elastic support member 6 such as rubber, and the lower end neck 2a of the hopper 2 is tied to the center of the diaphragm. The vibration of the diaphragm 1 is transmitted to the hopper 2, and the hopper 2 houses, for example, zirconium or other arbitrary fine powder, and the size of the fine powder is several microns. A take-out pipe 3 having an inner diameter of, for example, 2 mm is screwed onto the lower neck 2a of the hopper 2, and its upper end surface is at the same level as the bottom surface of the hopper 2. was prevented from forming. At the upper end of the extraction pipe 3
An opening 4 having a minute diameter of about 0.2 to 0.4 mm is provided, and the upper end 5a of the interior 5 below the opening 4 is tapered and continuous with the main body of the extraction tube 3.

Incidentally, the upper end surface of the take-out tube 3 provided with the minute diameter opening 4 and the bottom surface of the hopper 2 do not necessarily have to be on the same level.

In the embodiment shown in FIGS. 1 and 2, the upper end 5a of the inside 5 of the extraction tube 3 is squeezed into a conical shape to form a small diameter opening 4.
However, as shown in the embodiment shown in FIG. A take-out pipe 3 having a diameter larger than the diameter of the opening 4 may be connected.

In the above configuration, when a signal is applied to the piezoelectric element 1b to vibrate the diaphragm 1, the fine powder accommodated in the hopper 2 passes through the take-out tube 3 and passes by 1/10 per second.
Approximately 0.00 grams could be continuously taken out at a time, and during this time, no obstruction occurred in the flow of the fine powder.

The vibration frequency of the diaphragm 1 (the frequency of the signal applied to the piezoelectric element 1b) is set to an appropriate frequency depending on the size of the particles to be handled.

In addition, the vibration of the diaphragm 1 is obtained by the piezoelectric element 1b, and the vibration of the piezoelectric element 1b becomes multi-mode vibration depending on the form of the applied signal, so that the fine powder is delivered to a specific location in the hopper 2. There is no eccentricity, and this is also a factor in being able to take out the fine powder in minute amounts without stagnation.

In addition to the fine powder described above, the present invention can also be carried out when taking out a generally viscous fluid such as a viscous liquid in small amounts from a hopper.

〔Effect of the invention〕

According to the present invention, the upper end opening of the powder take-out tube connected to the bottom of the hopper has a minute diameter, and the lower part thereof has a larger diameter than the small-diameter opening at the upper end and is continuous to the lower end opening of the take-out tube, so that the vibration of the diaphragm Coupled with this action, the flow of fine powders, viscous fluids, etc. is not blocked during the extraction process, and the flow is extremely smooth, and these contained materials are continuously and smoothly delivered in small amounts set per unit time. It has an effect that can be taken out.

[Brief explanation of drawings]

Fig. 1 is a cutaway side view of a take-out device showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part thereof, Fig. 3 is an enlarged sectional view of the main part showing another embodiment, and Fig. 4 is an enlarged sectional view of the main part. It is a partially enlarged sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Vibration plate, 2... Hopper, 3... Take-out pipe, 4... Upper end opening of the take-out pipe, 5a... Upper end hole inside the take-out pipe.

Claims (1)

[Claims] 1 In a device in which fine powder, viscous fluid, etc. stored in a hopper attached to a diaphragm is taken out from a take-out pipe connected below the hopper, a minute opening is provided at the upper end of the take-out pipe, and the A small amount extraction device for fine powder, viscous fluid, etc., characterized in that the hole from the lower part to the lower end opening of the extraction tube has a larger diameter than the upper end opening.