RU2540889C2 - Chamber feeder of positive-pressure pneumatic conveying installation - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to pneumatic conveying, namely to discharging loose materials, e.g. alumina, cement and other corrosive dust-producing materials from flexible shell (package) using compressed gas. Chamber feeder of positive-pressure pneumatic conveying installation includes intake chamber for flexible package accommodation. Discharge pipeline is mounted on hinged cover. Pressure pipeline fitted in cover has fitting pipe with discharge nozzle with air intake holes and knife device for flexible package cutting. The air intake holes are directed towards package bottom, and sharp part of knife device is made outside air intake holes and in direction of articulated joint above the above mentioned cover. The fitting pipe with discharge nozzle is able to move freely under action of its own weight.

EFFECT: lower energy consumption for ejection of loose materials from flexible package, less dust in working areas, higher productivity and reliability of chamber feeder operation and providing integrity of flexible package bottom.

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Description

The invention relates to pneumatic transport, namely, to unload bulk materials, for example alumina, cement, powdered lime and other dust-forming and aggressive materials from flexible shells (containers), using compressed gas and can be used in metallurgy, mechanical engineering, chemical, construction and other areas of industry related to the processing of bulk materials.

Known chamber feeder injection pneumatic transport installation containing a receiving chamber for accommodating flexible containers, a pivotally mounted lid on the receiving chamber, a discharge pipe, a discharge pipe having a nozzle with a discharge nozzle with air supply holes and a knife device for cutting flexible containers (RU 2261214, 10.02 .2005).

However, the discharge pipe is located on the side of the receiving chamber. The need to open flexible containers before closing the lid increases the unloading time of the receiving chamber. There is a danger of clogging of the opening of the intake pipe with the edges and fragments of flexible containers, which reduces the reliability of the chamber feeder.

Also known is a chamber feeder for a pneumatic conveying installation containing a receiving chamber for accommodating flexible containers, a lid pivotally mounted on the receiving chamber on which a discharge pipe is mounted, and a discharge pipe having a nozzle with a discharge nozzle with air supply openings and a knife device for cutting the flexible container (2323151, 04/27/2008).

The presence of the nozzle of the injection nozzle with a knife device for cutting the bottom of the flexible packaging in the bottom of the receiving chamber complicates the design of the chamber feeder. Eliminates the possibility of reuse of flexible packaging. In the process of cutting the bottom of the flexible packaging with a knife device, a spill of material is observed between the bottom of the flexible packaging and the bottom of the receiving chamber. Providing aeration of the entire column of material leads to an additional consumption of energy.

The objective of the invention is to reduce energy consumption for the removal of material from a flexible container placed in the chamber feeder, increase productivity and reliability of its operation, as well as simplifying the design of the chamber feeder and maintaining the bottom of the flexible container when unpacking.

The technical result of the invention is such a design of the chamber feeder that provides lowering of the injection nozzle under the action of its own weight as the surface level of the unloaded bulk material decreases during its unloading.

This is achieved by the fact that in the chamber feeder of the discharge pneumatic conveying installation containing a receiving chamber for accommodating flexible containers, a lid pivotally mounted on the receiving chamber on which the discharge pipe is mounted and a discharge pipe having a nozzle with a discharge nozzle with air supply openings and a knife device for cutting flexible containers, the discharge pipe is mounted in the lid, a pipe with a discharge nozzle is installed inside the discharge pipe with the possibility of free movement under its own weight, the nozzle air supply holes are directed to the bottom of the flexible container, and the pointed part of the knife device is made outside the air supply holes and in the direction of the hinge above the specified cover.

In FIG. 1 shows a chamber feeder for an injection pneumatic conveying system; in FIG. 2 - node II; in FIG. 3 - node I; in FIG. 4 - section aa on node I.

The chamber feeder contains a receiving chamber 1 with a lid pivotally mounted on it 2. In the receiving chamber 1 a flexible (soft) container (container) 3 with bulk material in a closed state is placed. The discharge pipe 4 is mounted on the cover. The discharge pipe 5 having a pipe 6 with a discharge nozzle 7 is mounted in the cover 2. A pipe 6 with a nozzle 7 is installed inside the discharge pipe 5 with the possibility of free movement along it under its own weight. A nozzle 7 with a knife device 8 is mounted on the pipe 6. The blade of the knife device 8 is directed downward to cut the upper part of the flexible container 3. To remove excess air through the duct 9, the bottom 10 of the receiving chamber 1 is equipped with a pipe 11. The upper part of the receiving tank 1 is provided with a protrusion 12 for closing the lid 2 using the locking device 13. The discharge pipe 5 is equipped with an adjustable latch 14, which is inserted into the cutout 15 of the nozzle 6. The injection nozzle 7 with the knife device 8 is made in the form of a hollow ring 16 with holes 17 along the ne iferii directed at an angle to the axis of the receiving chamber 1 and towards the bottom of the flexible container 3. Sharpened portion 18 is a doctor blade 8 is formed outside the periphery of the ring 17 and the injection nozzle 7 in the direction of the hinge 19 of said cover 2 above.

The container 3, filled with bulk material, in the closed state is lowered into the receiving chamber 1. The excess air between the bottoms of the flexible packaging 3 and the receiving chamber 1, which is formed in a closed space when dropped, is discharged through the pipe 11 of the pipe 9 into the transport pipe 4. Pivotally mounted on the receiving the chamber 1, the cover 2 is closed and closed by the locking device 13. In the process of lowering the cover 2, the pipe 6 under the influence of its own weight freely moves along the discharge pipe 5 down. The knife device 8 with a force of the weight of the cover 2 and the pipe 6 cuts the upper part of the flexible containers. The injection nozzle 7 rests on the surface of the bulk material. Compressed gas (air) is supplied to the holes 17 of the injection nozzle 7. The upper layers of bulk material in a flexible container are aerated, becoming fluid, and are forced out by compressed gas into the transport pipeline 4. During the supply of compressed gas to the cavity of the flexible container, its walls are pressed against the walls of the receiving chamber. In the process of unloading as the surface of the bulk material is lowered, the discharge pipe 6 with the knife device 8 is lowered in the direction of the bottom of the flexible container. The lowering distance of the discharge pipe 6 with a cutout 15 along the discharge pipe 5 down to the bottom of the flexible packaging is limited by the latch 14. The distance from the pointed part 18 of the knife device 8 to the bottom of the flexible packaging 3 is also controlled by an adjustable latch 14. The pipe 11 is designed to remove excess air from the gap, formed in a confined space when the flexible packaging 3 falls into the receiving chamber 1. After emptying the packaging 3, the supply of compressed air through the discharge nozzle 7 is stopped. The lid 2 is opened, the container 3 emptied and cleaned of material particles is removed and the cycle repeats.

In the proposed device, the location of the discharge pipe 4 on the cover 2, and the discharge 5 in the cover 2 provides the multifunctionality of the invention. The presence of mobility of the discharge nozzle of the injection nozzle 7 with a knife device 8 along the injection pipe 5 provides unhindered lowering of the injection nozzle 7 to the surface of the material, and after the supply of compressed air and its aeration. This free movement of the discharge pipe ensures maximum chamber feeder performance for this design option. The presence of an adjustable lock provides the estimated value of lowering the discharge pipe with the nozzle towards the bottom of the receiving chamber and restricting movement along the discharge pipe when opening the cover of the receiving chamber.

A discharge nozzle movably installed in the discharge pipeline during material unloading during the supply of compressed air through the discharge nozzle into the flexible container ensures that it is lowered into the material layer. This free movement of the discharge nozzle provides maximum chamber feeder performance for this design option. The implementation of the injection nozzle with a knife device with holes directed towards the bottom of the flexible packaging, increases the process of unloading bulk material.

Lowering the flexible packaging, closing the lid of the receiving container, cutting the top of the corked packaging and emptying the container from bulk material is carried out automatically. The performance of this device is tested on a pilot plant.

Claims (1)

A chamber feeder for a pneumatic conveying installation containing a receiving chamber for accommodating flexible containers, a lid pivotally mounted on the receiving chamber on which the discharge pipe is mounted, and a discharge pipe having a nozzle with a discharge nozzle with air supply openings and a knife device for cutting flexible containers the fact that the discharge pipe is mounted in the cover, a pipe with a discharge nozzle is installed inside the discharge pipe with With the possibility of free movement under their own weight, the nozzle air supply openings are directed to the bottom of the flexible container, and the pointed part of the knife device is made outside the air supply openings and in the direction of the hinge above the specified cover.

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