SU880916A1 - Apparatus for pneumatic feed of loose materials - Google Patents

Description

(54) DEVICE FOR PNEUMATIC FEEDING OF BULK MATERIALS

one

The invention relates to a pneumatic conveying system and can be used, for example, for the delivery of concrete mixture to a transport pipeline of a pneumatic conveying installation.

A device for pneumatically feeding bulk materials is known, which contains a vertical tank, the upper part of which is connected to a source of compressed air and equipped with a loading valve, and there is a discharge opening 1 in the lower one.

The disadvantage of this device is that it does not provide batch feed of material.

It is also known a device for pneumatically feeding bulk materials, comprising a vertical container, the upper part of which is connected to a source of compressed air and equipped with a loading valve, and the bottom has a discharge opening, a cylindrical horizontal chamber located below the container and a loading opening, discharge port, located under the container and a nozzle for supplying the compressed air to the latter and mounted in the chamber rotatably from

drive shaft with blades, forming between them a cell 2}.

However, this device is characterized by its insufficiently high performance, since the material is supplied to the discharge pipe and then to the transport pipeline in portions of small size equal to the cell volume. The increase in the volume of the cells is irrational, since it leads to an increase in the volume of the chamber and, as a consequence, to the bulkiness and increased metal intensity of the entire device.

The purpose of the invention is to improve the performance of the device.

This goal is achieved in that the chamber is provided with a nozzle for feeding it

15 compressed air installed in its upper part, the cells are interconnected, and the blades are made T-shaped and mounted on the shaft with the possibility of alternately blocking the discharge opening, the nozzle and the discharge port.

W The drawing shows a device for pneumatic feeding of bulk materials, mainly concrete mix, a general view.

The device consists of a vertical tank 2 supported on frame 1, the upper part of which has nozzles 3 for conveying air into it, a loading valve 4 and a charging funnel 5. In the lower part of the tank there is a discharge opening and a flange to which cylindrical horizontal chamber 6 is rigidly attached Inside which is located a shaft 7 with T-shaped blades 8. At the bottom of the chamber there is a discharge pipe 9 to which the pipe 10 is attached for supplying compressed air to it. The loading window of the chamber 6 is aligned with the discharge opening of the container 2. In the upper part of the chamber 6, the nozzle II is mounted, and the cells formed between the blades 8 communicate with each other.

The device works as follows.

The loading valve 4 is opened, and the concrete mixture is loaded into the container 2 through the funnel 5. The drive of the rotation of the shaft 7 and the compressor are turned on. Nozzles 3 and 11 and nozzle 10 are supplied with compressed air. When one of the rotating blades 8 of the discharge opening of the container 2 and overlaps with the other blades of the nozzle II and nozzle 9 is opened, the concrete mixture is forced out of the tank 2 into the chamber 6 by compressed air, completely filling the volume of the latter, as the cells are interconnected. Upon further rotation of the shaft 7, one of the blades overlaps the discharge opening of the container 2, while others open the nozzle 11 and the pipe 9, while the concrete mixture is forced out of the chamber 6 to the pipe 9 and further transported through the transport pipeline (not shown) to the place of destination . Then the cycle is repeated. The blades 8 simultaneously with the overlapping of the nozzle II, the pipe 9 and the discharge opening of the tank

stirring the concrete mixture and making it fit on the walls of chamber 6.

This device allows to increase productivity by supplying concrete mix in portions equal to the chamber volume and by preventing the mix from hanging in the chamber.

Claims (2)

1. Australian patent number 474643, cl. 59.8, 1976. 2. US patent number 2152632, cl. 302-49, 1934 (prototype).