RU2261214C2 - Feeder for pressure pneumatic transport plant - Google Patents

Abstract

FIELD: pneumatic transport.

SUBSTANCE: feeder comprises receiving chamber, relief pipeline, and pressure nozzle with air passages provided with caps. The top cap is mounted for permitting rising above the bottom one when the compressed air is supplied to the passages and discharging the air toward the bottom of the receiving chamber. The top cap is provided with knife device whose blade points upward. The knife is used for cutting the bottom of the flexible reservoir housed inside the receiving chamber of the feeder. The cap has baffles that define curved slot passages for permitting the cap to rotate together with the knife device when the compressed air is supplied to the nozzle. The space of the receiving chamber from the side of its bottom is in communication with the relief pipeline for discharging the excess of air through the air passage from the space when the relief flexible reservoir is inside the receiving chamber of the feeder.

EFFECT: expanded functional capabilities.

3 dwg

Description

The invention relates to pneumatic transport, namely to unloading from a flexible shell (containers) of bulk materials, such as alumina, cement and other aggressive dust-forming materials using compressed air, and can be used in metallurgy, mechanical engineering, chemical, construction and other industries related with the processing of bulk materials.

Known chamber feeder pneumatic installation containing a receiving chamber, a discharge pipe and a discharge nozzle with air supply channels for supplying compressed air to these channels.

However, in this chamber feeder a flexible shell filled with bulk material is made fixed in the receiving chamber. The lack of a device for cutting the bottom of the shell limits the technological ability of the feeder. When filling in a flexible shell with dust-forming bulk material, a large amount of dust is generated at the workplace (SU 839936, 06.23.1981).

Also known is a chamber feeder of an injection pneumatic conveying installation, comprising a receiving chamber, an unloading pipe, and an injection nozzle with air supply channels, including caps, the upper of which is mounted with the possibility of lifting above the lower one when compressed air is supplied to the said channels and this air is output towards the bottom of the receiving chamber.

This design also lacks a knife device for cutting the bottom of the container and a device for eliminating dust generation when loading containers filled with bulk material into the receiving chamber (RU 2190569, C2, 10.10.2002).

The objective of the invention is to expand the technological capabilities of the chamber feeder and reduce dust formation in the work areas when unloading dust-forming bulk materials from flexible shells.

The technical result of the invention is such a constructive implementation of the chamber feeder, which provides placement in its receiving chamber of a flexible container filled with dust-forming bulk material, cutting the bottom of the container and emptying it with compressed air without generating dust in the work areas.

This is achieved by the fact that in the chamber feeder of the injection pneumatic conveying installation containing a receiving chamber, an unloading pipe and a discharge nozzle with air supply channels, including caps, the upper of which is installed with the possibility of lifting above the lower when compressed air is supplied to the said channels and this air exits towards the bottom of the receiving chamber, a knife device with an upward-facing blade is mounted on the upper cap for cutting the bottom of the flexible container placed in the receiving chamber of the feeder the upper cap is provided with baffles forming curvilinear slotted channels for rotating this cap together with the knife device when compressed air is supplied to the nozzle, and the cavity of the receiving chamber from the side of its bottom is communicated by an air duct with an unloading conduit for venting excess air from this cavity when it falls unloading flexible containers in the receiving chamber of the feeder.

Figure 1 shows a chamber feeder; figure 2 - node I in figure 1; figure 3 is a section aa in figure 2.

The chamber feeder comprises a receiving chamber 1, an unloading pipe 2, an unloading pipe 3, a cover 4, a compressed air supply pipe 5, a nozzle 6 and a knife device 7. A chute 8 equipped with a clamp 9 is mounted above the receiving chamber 1. A flexible shell is placed on the chute 8 (packaging) 10, filled with dust-forming bulk material, for example a bag with alumina in the closed state. The injection nozzle 6 contains the upper and lower caps 11 and 12 (figure 2). On the upper cap 11, a knife device 7 is mounted with an upward-facing blade for cutting the bottom of the flexible container 10, which is placed in the receiving chamber 1 of the feeder. The air supply channels 13 of the nozzle 6 are directed toward the bottom 14 of the receiving chamber 1. The upper cap 11 is mounted with the possibility of lifting above the lower 12 and rotating around a vertical axis when compressed air is supplied to form air supply channels 13 between them. The nozzle channels 13 are located above the bottom 14 of the receiving chamber at a height sufficient to accommodate the bottom of the container. Partitions 15 (Fig. 3) of the upper cap 11 form curved slotted channels 16 for rotating this cap together with the knife device 7 when compressed air is supplied to the nozzle 6. The cavity of the receiving chamber 1 from the side of its bottom 14 is communicated by an air duct 17 with an unloading pipe 3 for venting excess air from this cavity when the unloaded flexible packaging 10 falls into the receiving chamber of the feeder.

The container 10 is placed on the tray 8 above the receiving chamber 1 and is held by the latch 9. During the loading of the chamber 1, the latch 9 releases the container 10 filled with dust-generating material in the closed state. The container 10 freely falls into the receiving chamber 1 on the knife device 7. Under the influence of the gravity of the material, the bottom of the container is cut as a result of impact with the knife device 7 and lowers to the bottom 14 of the receiving chamber 1, as a result of which the injection nozzle 5 is inside the container material 10 above its bottom part. At this time, the upper cap 11 of the injection nozzle 6 is pressed against the lower cap 12. The nozzle 6 is locked. The upper part of the container is opened, the cover 4 of the receiving chamber is closed. Compressed air is supplied through the nozzle 5 to the injection nozzle 6. Under the action of the compressed air pressure, the upper cap 11 rises above the lower 12. When passing through the curved slotted channels 16, the swirling compressed air flows rotate the upper cap 11 with the cutting device 7. Rotary movement of the knife device 7 allows you to finally cut through thick-walled flexible shell. In a swirling form, flows of compressed air are fed into the bulk material of the container. The material is aerated and forced out by compressed air into the transport pipeline. After emptying the container, the supply of compressed air stops. Under the influence of its own weight, the upper cap is lowered, blocking the air supply channels 13. Open the lid 4, remove the container emptied and cleaned of particles of material, and the cycle repeats.

In the proposed device, the release from the latch of the container, cutting its bottom, closing the lid of the receiving container and emptying the container from bulk material can be carried out automatically. The possibility of lifting and rotating the upper cap with a knife device when applying compressed air to the air supply and curvilinear channels of the nozzle allows you to cut through the bottom of a thickened flexible container. The presence of an air duct to remove excess air from the cavities between the walls of the container and the receiving container, between its bottom and the bottom of the loading chamber, formed when the container falls, makes it possible to empty the flexible container without dust formation in the process of dropping it into the receiving chamber with the lid open.

Claims (1)

A chamber feeder for an injection pneumatic conveying installation, comprising a receiving chamber, an unloading pipe, and a discharge nozzle with air supply channels, including caps, the upper of which is mounted with the possibility of lifting above the lower one when compressed air is supplied to the said channels and this air is discharged towards the bottom of the receiving chamber, characterized in that a knife device with an upward-facing blade is mounted on the upper cap for cutting the bottom of the flexible container placed in the receiving chamber of the feeder, the upper cap is provided with baffles forming curved slotted channels for rotating this cap together with the knife device when compressed air is supplied to the nozzle, and the cavity of the receiving chamber from the side of its bottom is communicated by an air duct with an unloading pipe to exhaust excess air from this cavity when the unloaded flexible containers in the receiving chamber of the feeder.

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