JPS6037376Y2 - Powder feeding device - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for charging powder into tanks, ship holds, etc., and specifically refers to the flashing phenomenon of powder (a phenomenon in which fine powder, etc., rapidly flows and diffuses when it contains air).

). Conventionally, a device as shown in FIG. 1, for example, has been used to charge powder into an open tank or ship hold.

This device suspends a retractable input chute 2 below the input hopper 1, and a flexible skirt is attached to the lower edge of a hood 3 formed at the lower end of the input chute 2 in contact with the input surface (accumulation surface or floor surface). 4 will be provided.

On the other hand, the supply conveyor 5 having the input hopper 1 is provided with a dust collection device 6.

Further, an airtight telescopic bellows tube 7 that wraps around the outer periphery of the dropping chute 2 is connected to the hood 3, and the bellows tube 7 and the suction side of the dust collection device 6 are communicated via an intake pipe 6a.

A secondary air intake window 8 is provided on the side surface of the hood 3, a swinging piece 9 is swingably suspended above the hood 3, and the swinging piece 9 is mounted on the inner surface of the hood 3 at a swinging angle A. A limit switch 10 is installed so that the limit switch 10 comes into contact when the temperature exceeds the limit.

A hoisting drum 11 is attached to both sides of the charging hopper 1, and the ends of a rope 12 wound around the hoisting drum 11 are tied to the shoulders of the hood 3.

With the skirt 4 in contact with the falling point of the powder, remove the hood 3.
When powder is dropped from the hopper 1 through the chute 2 into the hood 3, the amount of powder deposited at the drop point gradually increases, and as the powder increases, dust is scattered inside the hood 3.

When the dust collection device 6 connected to the bellows pipe 7 is operated, secondary air is sucked in through the intake window 8, and when this secondary air flows through the hood 3 and the bellows pipe 7, the powder scattered inside the hood 3 is removed. is collected in the dust collection device 6.

The collected dust is returned to the supply conveyor and dumped again.

As the powder accumulation increases at the falling point, the rocking piece 9
Push and expand.

When the swing piece 9 comes into contact with the limit switch 10, a drive device (not shown) is activated to drive the winding drum 11 and lift the hood.

When the swinging piece 9 returns to its original position and separates from the limit switch 10, the hood 3 stops rising.

The rocking piece 9 is again pushed and expanded by the increasing accumulation of powder, and the above action is repeated.

In this way, powder is charged from the hopper 1 and loaded while preventing dust from scattering.

However, such means refer to a bridging phenomenon (a phenomenon in which powders compete and form a crosslinked state).

) is effective for processing crushed powder of grains and Uozu grains, but when the powder is subject to significant flushing, such as crushed cement or talcum powder, it is necessary to flush the powder from the gap between the creases of the suction window 8 and the skirt 4. There was a drawback that the powder would flow out in a torrent and spread to the surrounding area.

In view of the above-mentioned drawbacks, the object of this invention is to provide a device that suppresses flushing of the dropped powder and eliminates outflow and diffusion of the powder.

An embodiment of this invention will be explained based on the drawings.

FIG. 2 is a front view of the device of the present invention, and FIG. 3 is an enlarged cross-sectional view of the lower part of the chute. Members common to those in FIG.

In FIG. 2, an opening/closing damper 13 is interposed below the charging hopper 1 to which a conveyor (not shown) is connected, and a charging chute 2 is installed under the opening/closing damper 13, and a bellows-type airtight telescopic tube is connected via a holding frame 14. 7 is connected and provided.

The holding frame 14 has an interior connected to a vacuum pump (not shown) via a vacuum suction pipe 15, and houses a lifting device 16 on the outside.

In FIG. 3, a hood outer cylinder 18 and a hood inner cylinder 19 are concentrically attached to the lower end of the charging chute 2 via a bracket 17.

The telescopic pipe 7 is airtightly connected to the upper part of the hood outer cylinder 18, and a flexible conical skirt 20 is connected to the outer periphery of the lower part.

The hood outer cylinder 18 airtightly connects a rigid outer upper cylinder 21 and an outer frame cylinder 22 via a flexible and stretchable outer cap part 23.
An outer contact ring 24 having flexibility that can be expanded and contracted is provided at the lower edge of 2.

The hood inner cylinder 19 airtightly connects the rigidity-enhancing cylinder 25 and the inner frame cylinder 26 via a flexible and stretchable inner cap part 27, and provides the lower edge of the inner frame cylinder 26 with flexibility that allows it to expand and contract. An inner abutment ring 28 is provided.

The conical skirt 20 has elastic expansion shafts 30, 31 mounted on the inner surface and outer edge of the frusto-conical canopy 29.

Furthermore, a detector 32 for detecting the level of powder accumulation inside the hood outer cylinder 18 and a rope sheep 34 around which the rope 33 of the lifting device 16 is wound are provided.

The operation of each part of the above structure will be explained next.

The opening/closing damper 13 controls the amount of powder to be introduced and also adjusts the amount of incoming air.

The airtight telescopic tube 7, the hood outer cylinder 18, and the skirt 20 block outside air so as to prevent air from entering the powder input section.

The reduced pressure intake pipe 15 reduces the air pressure inside the airtight telescopic pipe 7 and the hood outer cylinder 18, thereby eliminating flashing and increasing the powder density at the falling point.

The outer hood cylinder 18 and the inner hood cylinder 19 partition the surface of the powder deposited by dropping into multiple layers to prevent the powder from flowing out all at once.

The lower edges of the outer cap part 23 and the inner cap part 27 are inclined according to the slope of the accumulated powder, so that the powder can be densely packed.

The outer contact ring 24 and the inner contact ring 28 flexibly adapt to the unevenness of the powder deposition surface and fill the gap.

The elastic expansion shafts 30 and 31 of the skirt 20 expand the truncated cone-shaped canopy 29 and smooth out the wrinkles against the shrinkage of the frusto-conical canopy 29 when the pressure is reduced at the point where the powder falls. It adapts to the unevenness of the powder accumulation surface and the floor surface, and suppresses the flow of powder and air.

The detector 32 detects the powder accumulation level within the hood outer cylinder 18 and controls the operation of the lifting device 16 based on the signal.

In the above description, the outer tube 18 and the inner tube 19 of the hood are provided concentrically in double layers, but the hoods may be further provided in multiple layers if necessary.

In addition, the cap parts 23 and 27 have a single frame cylinder 22 and 26, respectively.
However, the frame tubes 22 and 26 may be attached in plural stages to the intermediate portions of the cap parts 23 and 27, respectively.

Furthermore, elastic expansion shafts 30 of different diameters may be mounted concentrically in multiple stages on the inner surface of the canopy 29.

As explained above, the powder feeding device of this invention has an outer hood tube attached to the lower end of the airtight telescoping tube and an inner hood tube attached to the lower end of the input chute. The surface of the body is divided into multiple layers to prevent powder from flowing out all at once.

In addition, the outer hood cylinder and the inner hood cylinder each have a flexible and stretchable cap part in the middle of each body, so even if the floor or powder accumulation surface is a slope, the hood can be easily adjusted according to the slope. Since the hood cylinder and/or the hood inner cylinder can bring the conical skirt into close contact with the inclined bed surface or the powder accumulation surface, it is possible to block the dropped powder and airflow, maintain low pressure in the hood, and reduce the amount of powder. It is possible to stop the outflow.

[Brief explanation of drawings]

FIG. 1 is a front view showing a conventional example, FIG. 2 is a front view showing an embodiment of the present invention, and FIG. 3 is an enlarged sectional view of the hood portion in FIG. 2. 2... Insertion chute, 7... Airtight expansion tube, 18.19... Food cylinder, 24.28...
...Abutment wheel.

Claims (4)

[Scope of utility model registration request] (1) A holding frame is provided below the input hopper connected to the conveyor via an opening/closing damper, and a bellows-shaped airtight telescopic tube having an internally expandable input chute is connected to the holding frame to create a rope-type suspension. A hood outer cylinder is attached to the lower end of the airtight telescopic tube, and a hood inner cylinder is attached to the lower end of the input chute, and each body of the hood outer cylinder and the hood inner cylinder is suspended telescopically through a lifting device. A powder feeding device characterized in that a flexible and stretchable cap part is provided in the middle of each part, and a flexible conical skirt made of a truncated cone-shaped canopy is attached to the lower end of the hood outer cylinder. . (2) The powder feeding device according to claim 1, which is characterized in that an elastic expansion shaft is attached to the inner surface and outer edge of the conical skirt. (3) Utility model registration claim 1 or 2, characterized in that a contact ring having flexibility that can be expanded and contracted is attached to each lower edge of the outer hood cylinder and the inner hood cylinder. The powder feeding device described. (4) A powder level detector and a rope sheep are provided in the hood outer cylinder, the powder level detector and the lifting device are electrically connected, and the rope sheep and the lifting device are connected via the rope. A powder charging device according to any one of claims 1 to 3 of the utility model registration claim, characterized in that the powder charging device is connected.