JPS6038581Y2 - Powder dropping device - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for stably dropping powder, and in particular, a dropping device that suppresses the flashing phenomenon of powder (a phenomenon in which fine powder, etc. rapidly flows and spreads by drawing in air). Regarding equipment.

An example of the most functional conventional dropping device is shown in FIG.

In the figure, an upper case 3 which also serves as a dust suction port is provided outside the drop port 2 of the conveyor 1.

Beneath the drop opening 2, a bendable and extensible guide chute 6 in which a plurality of tapered short pipes 4 are connected by a flexible strip 5 is suspended.

A bendable and expandable chute outer tube 7 that airtightly encloses the guide chute 6 is suspended from the lower surface of the upper case 3.

A skirt 9 is suspended from the lower end of the chute outer tube via a lower case 8.

The end of a rope 11 wound around a winder 10 is tied to the lower case 8, and the skirt 9 has a flexible side plate 12 that is swingably suspended from the lower case 8. Airtight cloth 1
3 allows expansion and contraction to be freely connected.

A dust collector 14 and a suction fan 15 are installed on top of the conveyor 1, and the upper case 3 and the dust collector 14 are connected through a dust suction pipe 16, and the dust collector 14 and the suction fan 1 are connected through an intake pipe 17.
Connect with 5.

A rotary valve 18 is provided at the bottom of the dust collector 14, and the rotary valve 18 and the conveyor 1 are connected via a collection pipe 19.

With the above structure, the space at the falling point of the dropped powder is covered by the skirt 9.
The dust that rises inside the skirt 9 is sucked into the dust collector 14 through the chute outer tube 7 and the upper case 2 to separate the powder from air, and the powder is returned to the conveyor 1.

The skirt 9 is moved up and down freely by the rope 11 by operating the winder 10.

However, in the case of an airtight hood such as this skirt 9, in the case of powder such as cement that has a significant flushing property, the air flow containing the powder flows out like a torrent through the lower edge of the skirt 9, scattering dust. There were drawbacks.

The idea is to install a truncated inverted conical cage inside the hood at the bottom of the chute to slowly absorb the impact of powder falling at high speed, suppress the flashing phenomenon, and prevent the powder from flowing out and spreading. That is.

An embodiment of this invention will be explained with reference to FIG.

In FIG. 2, a lower case 19 suspended by a rope 11 is connected to the outer chute tube 7, and a short tube 20 facing below the guide chute 6 is installed in the lower case 19.

A hood frame 21 is fixed concentrically to the lower surface of the lower case 19, and a hood outer cylinder 22 and a hood inner cylinder 23 are attached to the lower part of the hood frame 21 in the form of concentric multiple cylinders.

Inside the hood inner cylinder 23, a cage 24 having a truncated inverted conical shape and a slit-like opening 24a is provided concentrically via a support plate 25 that is perpendicular to the radial direction.

At the upper part of the inner and outer hood cylinders 22 and 23, there is provided an intake pipe 26 for collecting dust that communicates from the inside of the inner hood cylinder 23 to between the outer hood cylinder 22 and the inner hood cylinder 23 and to the outside of the outer hood cylinder 22. establish.

Extended skirts 27, 28, and 29 are attached to the hood outer cylinder 22, hood inner cylinder 23, and cage 24, respectively.

Each of the skirts 27, 28, 29 has a frustoconical canopy 27a, 28a, 29a with a hem ring 27b, 28b made of a flexible elastic material at the large diameter edge.

29b, and the small diameter edge is airtightly connected to the lower part of the hood outer cylinder 22, the hood inner cylinder 23, and the cage 24.

An opening/closing tamper 30 is provided at the opening of the intake pipe 26 to the outside of the hood outer cylinder 22 to adjust the intake air amount during dust intake.

A powder level meter 31 is provided in a protruding manner within the hood inner cylinder 23.

Next, the operation of the above configuration will be explained.

Hood frame 21, hood M22, 23 and skirt 27.2
8 is to block the dropping space below the chute 6 from the outside in multiple ways to prevent the dropped powder from flowing out.

The level meter 31 detects the upper limit level of powder accumulated in the hood inner cylinder 23 and sends a signal for winding the rope 11.

The cage 24 has a truncated inverted conical shape, thereby restricting the downward flow of the powder and slowly absorbing the falling energy of the powder.

Further, a small amount of powder is allowed to flow out from the slit-shaped opening 24a to the hood inner cylinder 23 side so that the powder does not stagnate at all, and the powder is accumulated in the hood inner cylinder 23 to suppress the powder from blowing out.

As explained above, this device has a truncated inverted conical cage inside the hood tube connected to the bottom of the chute outer tube that envelops the chute, which allows the powder flow descending through the chute to be kept within the eye at a constant level. Because it is suppressed, the powder flow flowing out from the skirt has no force, and the problem of powder flow spouting can be solved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a conventional powder dropping device, and FIG. 2 is a front view showing an embodiment of this invention. 6: Guide chute, 7: Outer chute tube, 22: Outer hood tube, 23: Inner hood tube, 24: Cage, 24a: Cage opening.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a powder discharging device having a double pipe structure with an airtight chute outer tube arranged outside the powder discharging chute, multiple hood cylinders are provided under the chute outer tube. A powder dropping device characterized in that a truncated inverted conical cage facing below a guide chute is provided inside an inner hood cylinder. 2. The powder dropping device according to claim 1, wherein the cage is provided with a slit-like opening.