JPS60197533A - Dust preventing unit for dust-free chute - Google Patents

Abstract

PURPOSE:To suitably prevent cement accumulated in a chute from scattering, by providing a flexible member between an extendable pipe and a short pipe so that it is made into contact with both pipes, by displacing the surface of this extendable pipe with the use of blow and suction air to maintain air-tightness for the chute. CONSTITUTION:By stopping a fan for ventlating in an outer pipe 5 (extendable pipe) is a valve V1 is opened and a valve V2 is closed before a winder is actuated to blow air from an air pressure supply source 25 to fill air in a space C. Thereby a flexible plate 19 is displaced to a position indicated by two-dot chain line 19a due to the blowing amount of air and the pressure thereof. In this position the flexible plate 19 is made into close contact with a short pipe 8 in a dust-free chute 4 to vertically shut off the communication between the areas A, B in a space between the dust-free chute 4 and the outer pipe 5. As a result, even though cement dust accumulated on the inner wall surface 17 of the outer pipe 5 drops due to vibration and air stream which are generated when the dust- free chute 4 is subsequently displaced with its entirety, the cement dust is accumulated and trapped on the flexible plate 19 at the position 19a, thereby the dust is prevented from dropping and scattering.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust prevention device that prevents powder and granular material from falling from within the chute when the dust-proofed sea-1 of a loader stops operating and moves. .

Powdered materials include cement, soybeans, clinker, etc., and cement will be described below as an example.

The conventional cement loader shown in FIG. The dust collected at the bottom of the tank 11 is recycled to the conveyor 1.

A large number of tapered pipes 3, short pipes 8, and an expandable bellows-shaped outer pipe 5 are suspended in the dust collection chamber 2 below the outlet of the chute h,
The lowermost short tube 8 and the lower end of the outer tube 5 are fixed with a bracket 6, and the bracket 6 is connected to a winder 10 via a wire rope 9 so as to be movable up and down. Furthermore, the skirt 7 is fixed and the opposing surface is covered.

In the above configuration, even if the cement 15 falls from above into the area covered by the outer tube 5 and the skirt 7 and generates dust, the fan 13 sucks it up, so that it is not removed from the edge of the skirt 7 or around the conveyor 1. There is no outward scattering of dust. When the initial loading starts from the bottom 14 and ends, the dustproof chute 4 is rolled up above the deck surface 12 and moved to the next loading position.

As these operations are repeated, cement dust 18 in the airflow rising inside the outer tube 5 accumulates on the inner wall surface 17 of the expansion tube 5 and the like at the same time as the suction fan 13 stops, as shown in FIG. However, since the inner wall surface 17 has a bellows shape that expands and contracts, some of it accumulates even when the fan 13 is in operation, but most of it accumulates at the head of the rising air and accumulates for a short time, so it rarely sticks. Therefore, during the winding up of the dustproof chute 4 or when moving over the deck surface 12, the cement IrK18 is scattered from around the skirt 70 due to the effects of vibration and wind. However, losses due to loss of cement must be avoided, and the movement area of the dust chute 4 is also a work area for people, and other equipment is also installed, so it must be avoided to create a dust-filled environment. .

As described above with reference to FIGS. 1.2 and 1.2, the present invention aims to prevent the cement accumulated in the dust-proof chute from scattering.

Therefore, the gist of the present invention is to provide a chute in which a large number of short pipes are connected and hung, and a flexible plate, etc., which is in contact with the telescopic pipe and the short pipe, in the chute and the short pipe. A flexible member is provided, and the surface of the flexible plate is moved by air supply and intake to maintain airtightness.

An embodiment of the present invention will be described based on FIG. 2.

In the figure, a box 20 with a substantially U-shaped cross section is provided on the expandable bellows-shaped outer tube 5 provided on the side of the short tube 8 at the lowest end of the dust-proof chute 4, and the edge of the box 20 and the end of the outer tube 5 are provided. and the flexible plate 19 are held by a mounting plate 21 and fastened with bolts 22.

Air supply port 23 and intake port 2 from air source 25 to box 20
4 is provided, and the pulp V+ % Vt, Vs and the ejector 27 are connected to provide a pipe line 26t-. That is, as an air supply path, a pipe line is provided which communicates with the inside of the box 20 from the air source 25 through the pulp (2) and the air supply port 23. Further, as an intake path, a pipe line is provided which leads from the air source 25 through the pulp 2 to the ejector 27, and which also communicates with the intake port 24i which communicates the ejector 27 with the inside of the box 2o and the pulp v3. The space C between the box 20 and the flexible plate 19 is made airtight so that there is no air circulation with the A-B-D area around the outside.

The flexible plate 19 may be made of any flexible material, such as synthetic resin-impregnated woven fabric, rubber, vinyl, or paper. The box 2o is made of a light material that maintains airtightness, such as a steel plate, an A/plate, or a synthetic resin plate.

Next, the operation of the present invention will be described.

Stop the fan 13 that ventilates the outer tube 5, and before operating the winder 10, open the pulp Vl and close the pulp V2, and supply air from the air source 25 to the space C. The plate 19 is at the position 19a. When it reaches this point, it comes into close contact with the short pipe 8 to vertically cut off area A and area B. In this way, even if cement dust 18 that has accumulated on the inner wall surface 17 falls due to vibrations or wind action that occur when the entire dustproof chute 4 moves, the 19
It is deposited and captured on the flexible plate 19 at position m.

Next, when the dustproof chute 4 finishes moving to the next loader load amount and starts the loader, just before that, close the pulp v1 and open the pulp v2 and Vs, and the air in the space C will flow to the pulp v8.
is exhausted to the outside area D. It is natural to keep the internal pressure of space C by closing pulp v1 and closing pulp v2 and v3 at the same time as the air supply is completed. In order to create a negative pressure and draw the flexible plate 19 from the position 19a to the original position indicated by the solid line, air is supplied from the air source 25 and air is taken in from the intake port 24.

Air from air source 25 is exhausted through pulp v2, ejector 27 and pulp v3. At the time of this discharge, the effect of sucking in more air from the intake port 24 communicating with the ejector 27 is activated. In other words, the ejector 27 creates a negative pressure in the space C, and the flexible plate 1912 returns to its original position t. Pulp Vl at the same time as intake is completed.

Vz and v3 are all closed to maintain the internal pressure in space C.

Repeat the following steps to connect valves Vl, Vz, Vs and air source 25.
These operations are used to supply and inhale air.

The present invention prevents cement dust from falling inside the outer tube through the above-described structure and operation, thereby eliminating the scattering of dust and reducing loss due to loss of cargo.
The working environment for people and the environment around equipment has improved, improving labor efficiency and eliminating the need for dust cleaning. Furthermore, as a secondary effect, it is possible to extend the life of the equipment, especially for corrosive and
The effect is remarkable when loading sticky powder or granules.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing a dustproof sheet of a loader, and FIG. 2 is a sectional view of essential parts showing an embodiment of the present invention. 3: Short pipe, 4: Dust-proof chute, 5: Outer pipe, 19: Flexible plate, 20: Box, 23: Air supply port, 24: Intake port, 25
: Air source, Vs, Vg, v3: Valve, 27: Ejector @

Claims (1)

[Scope of Claims] 1. In a dustproof chute that connects a short pipe to a telescopic pipe and suspends it to ventilate the inside, a flexible member is provided so as to contact both the inner wall surface of the telescopic pipe and the outer wall surface of the short pipe. A dust prevention device for a dustproof chute characterized by being provided with. 2. A recess with a substantially U-shaped cross section for storing the flexible member is provided in the expandable tube, and an air supply port and an intake port are provided in this recess, which communicates with an air source via a valve and an ejector. A dust prevention device for a dustproof chute according to claim 1. 3. The space between the concave portion of the telescoping tube and the flexible member is made airtight so that air does not communicate with it from other than the air intake port. Dust-proof chute application preventer.