JPH0447111Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an improvement in a granular material storage device equipped with a protruding tube for sampling a portion of the material stored in a hopper.

[Background technology]

Some storage devices for powder and granular materials are equipped with a protruding tube for sampling on the side wall of the hopper in order to collect the material stored inside as needed. As shown in FIG. 4, a projecting cylinder 100 is formed to extend downward from the side wall of the hopper 101.
0 has a structure in which the upper part opens into a hopper 101 and a valve 102 is provided at a suitable position in the lower part. However, with such a structure, the valve 102 is opened during sampling, and the protruding tube 10 is closed.
Since the material introduced into the 0 is discharged by its own weight, when the valve 102 is closed after sampling, the discharge of the material is interrupted by the valve mechanism of the valve 102, which may cause material to get caught in the valve 102. In some cases, the material introduced into the protruding tube 100 for collection may remain without being ejected.

For this reason, when materials that require high quality are stored in resin molded products, there are problems such as foreign matter contamination due to biting of the material, or residual material that may cause old material to mix with new material, resulting in This makes sample inspection cumbersome.

[Purpose of invention]

The present invention was developed in view of the above-mentioned circumstances, and the purpose is to provide a storage device for powder and granular materials that does not get caught during sampling and does not leave any material inside the protruding tube after sampling. It is said that

[Structure of the idea]

The present invention proposed to achieve the above purpose is:
The present invention relates to an improvement in a storage device for powder and granular material, in which a protruding tube extending into the hopper and protruding from the side wall of the hopper for collecting a part of the material stored in the hopper is provided, particularly on the side wall of the hopper of the protruding tube. The part that extends further is made to protrude at a rising angle of inclination such that the material remaining inside the protruding cylinder falls into the hopper due to its own weight, and high-pressure gas is injected into the appropriate position of the extending part of the protruding cylinder. The hopper is characterized by a structure in which a gas purge mechanism is provided, and a part of the material stored in the hopper is discharged from the projecting cylinder by injecting high pressure gas by the gas purge mechanism.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of the material storage device A of the present invention, in which 1 is a hopper for storing granular material, 2 is
... indicates a protruding tube for sampling that protrudes from the side wall. In consideration of the fluctuation of the material level in the hopper 1, this protruding cylinder 2 is 2 in the illustrated example.
A book is provided. Reference numeral 3 denotes an auxiliary hopper for conveying the granular material sent from the hopper 1 of the storage device to other processing sections via the material transport pipe 12, and this auxiliary hopper 3 has a sealed pressure-resistant structure. ,
When a predetermined amount of material is supplied from the storage device A, the valve 4 is closed to cut off the supply of material, and the material is kept in an airtight state and the material is pumped to other processing sections. 5 and 5' are both gas supply pipes that supply pressurized gas such as pressurized air, 5 is used to force-feed the granular material stored in the auxiliary hopper 3, and 5' is a gas supply pipe that supplies pressurized gas such as pressurized air. It is used to supply pressurized gas to the pressurized gas injection nozzle 6. The pressurized gas injection nozzle 6 is interposed in the material supply pipe 12' that connects the hopper 1 and the auxiliary hopper 3, and when transferring the material in the hopper 1 of the storage device A to the auxiliary hopper 3, In order to prevent the material from getting caught, the valve 4 is opened and the gas is injected to completely transfer the material stored in the hopper 1 of the storage device A into the auxiliary hopper 3, and then the valve 4 is closed.

Further, 7 is a connecting pipe formed of a PVC hose, etc., which protrudes from the upper part of the hopper 1 and is connected to an exhaust pipe 8 connected to a duct (not shown), and is injected from the pressurized gas injection nozzle 6. After the material has been transferred, the pressurized gas is introduced into the exhaust pipe 8.

As shown in FIG. 3, the pressurized gas injection nozzle 6 injects pressurized gas into the annular gap 6a from a gas introduction pipe 6b through an orifice 6c provided at the tip of the annular gap 6a to a material supply pipe 12'. The material is transferred by injecting it into the tank.

In the illustrated storage device A, a material supply source (not shown)
The granular material fed with the pressurized gas is introduced into the hopper 1 through the material introduction pipe 13 provided at the top of the hopper 1, and the pressurized gas that has fed the material is passed through the exhaust pipe at the top of the hopper 1. 8 is discharged to the duct side. Pressurized air or the like is used as a transport medium for the material, but an inert gas such as nitrogen gas may be used for materials that strongly dislike oxidation.

Note that 9 is a discharge valve for discharging the material stored in the hopper 1, and 10 and 11 are both level meters for controlling the supply of material from the material supply source into the hopper 1. .

FIG. 2 is a diagram showing the structure of the protruding tube 2 provided with the gas purge mechanism B, which is the essential part of the present invention. Gas injection nozzles 20 are provided at appropriate locations along the way.

This gas injection nozzle 20 has a double structure formed by concentrically combining an inner cylinder pipe 20a and an outer cylinder pipe 20b, and of this double structure, the inner cylinder pipe 20a has one end. The outer cylindrical tube 20b is provided with a flange portion 201a, and a tapered portion 202a is provided on the outer peripheral edge of the other end.
0a, and when it is accommodated, a sufficiently wide annular gap 20c is formed between the outer peripheral surface of the inner cylindrical tube 20a and a tapered part 202a formed on the outer periphery of the inner cylindrical tube 20a. It has a structure in which one end has an enlarged diameter opening 201c in which an inner cavity 201b forming an annular orifice portion 20d is formed. As shown in the figure, in such a double structure, the flange 201a of the inner tube 20a fits into the recess 201d formed at the lower end of the inner cavity 201b of the enlarged diameter opening 201c of the outer tube 20b. The inner cylindrical tube 20a is inserted into the enlarged diameter opening 2 of the outer cylindrical tube 20b.
01c, and further the flange 2 of the extending portion 22.
A packing material 20e is interposed between the connecting part 2a and the connecting part 20f, and then a flap band 20f or the like is tightened to connect the connecting part. Note that the protruding pipe 20g communicating with the annular gap 20c is a pressurized gas introduction pipe.

In addition, in the example diagram, a U-shaped elbow 23 is provided above the gas injection nozzle 20 of the protruding cylinder 2 to form a top, and the U-shaped elbow 23 that forms this top On the opposite side of the injection nozzle 20, a straight pipe 24 is provided with a valve 25 that can open and close the discharge port 24a by rotating the operating handle 25a.
The hanging connection is made.

An important point in the gas purge mechanism B having such a structure is to prevent the material introduced into the protruding tube 2 from remaining after the material is discharged from the hopper 1 and collected. In the invention, in order to prevent such material from remaining, the rising angle θ of the extending portion 22 is set to an optimal value in consideration of the angle of repose of the material stored in the hopper 1. Furthermore, the protruding tube 2 needs to be sanitary depending on the material being handled, and in such cases it is desirable to form it from a stainless steel tube that is easy to wash with water, and to buff the inside.

In the storage device A equipped with such a gas purge mechanism B, when collecting material, the valve 25 is opened and the gas injection nozzle 20 is driven to inject pressurized gas, thereby removing the material stored in the hopper 1. The gas is introduced into the projecting tube 2 by the injection of the gas, and after rising up the extension portion 22 and reaching the top, it falls within the straight pipe 24 and is discharged from the discharge port 24a. Then, when the injection of pressurized gas from the gas injection nozzle 20 is stopped when the required amount of material discharged from the discharge port 24a has been collected, the projecting portion 22 of the present invention has a rising slope. Since the angle θ is set to an angle that does not cause any material to remain, the material in the protruding tube 2 will tend to return to the inside of the hopper 1 due to its own weight, and the material level in the hopper 1 will be at the opening position of the protruding tube 22. When it is lowered further, it will naturally fall due to its own weight, so it can be prevented from remaining in the protruding cylinder.

In this invention, the rising angle of the extending portion of the projecting tube can be freely adjusted.

Since the angle of repose of granular materials generally differs depending on the material, the angle of repose can be set to the optimum angle even when different materials are stored in the hopper, which is of course very convenient.

[Effect of idea]

As can be understood from the above explanation, according to the present invention, by driving the gas purge mechanism, a part of the material stored in the hopper can be released and collected, so the material can be collected naturally by opening the valve. In addition to preventing material from getting caught, it is also easier to collect compared to conventional structures that allow water to flow out.

In addition, the material remaining in the protruding tube after sampling will fall under its own weight and return to the hopper, so the material introduced into the protruding tube after sampling will remain inside the protruding tube for a long time until the next sampling. There is no residue and it is excellent in terms of hygiene.In addition, since there is almost no chance of old material being mixed with newly collected material, there is no need for troublesome inspections after collection.

[Brief explanation of the drawing]

Fig. 1 is an embodiment of the present invention, Fig. 2 is a vertical sectional view showing the structure of the gas purge mechanism, Fig. 3 is a structural explanatory diagram of a pressurized gas injection nozzle, and Fig. 4 is a diagram of a conventional storage device. It is an explanatory diagram. Explanation of symbols, A...Storage device, B...Gas purge mechanism, 1...Hopper, 2...Protrusion cylinder, 22...
...its extension, θ...its rising inclination angle,
20...Gas injection nozzle.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a storage device for powder and granular materials in which a protruding cylinder is provided on the side wall of the hopper and has an opening extending into the hopper to collect a part of the material stored in the hopper. , the part of the protruding cylinder extending from the side wall of the hopper is made to protrude at an angle of inclination such that the material remaining inside the protruding cylinder falls into the hopper due to its own weight, and the extending part of the protruding cylinder is Powder particles having a structure that is provided with a gas purge mechanism that injects high-pressure gas at a suitable location, and that a part of the material stored in the hopper is released from the protruding tube by injecting the high-pressure gas by the gas purge mechanism. Storage device for body materials. (2) The storage device for powdered or granular material according to claim 1, wherein the rising angle of the portion of the projecting tube extending from the hopper side wall is adjustable.