SU755727A1 - Screw feeder for pneumotransporting plant - Google Patents

Description

The invention relates to industrial transport, namely to screw feeders of pneumatic conveying installations for transporting cement, lime, alabaster, other ⁵ pulverized and granular materials.

Known screw feeder pneumatic installations, containing the receiving and provided with a check valve mixing chamber, interconnected by a cylindrical body located in it a pressure screw [1].

The disadvantage of the known feeder 15 is that during transportation of abrasive materials intensive wear of the auger occurs, which leads to instability of the transportation process, an increase in the consumption of energy for transportation, a decrease in the transportation distance.

Due to the uneven distribution of the material over the cross section at the end of the screw, it is possible for air to break through from the 25 mixing chamber into the screw channel.

The purpose of the invention is to reduce the specific energy consumption for the transportation of material and increase the durability of the screw. thirty

2

This goal is achieved by the fact that the final section of the last turn of the screw, defined by the central angle of the SO-5P °, is curved along an arc whose center is in a plane passing through the longitudinal axis of the screw and is located on the surface of its shaft, 1.5 auger radius.

In addition, the final section of the last screw auger, defined by a central angle of 30-50 °, can be located perpendicular to the longitudinal axis of the screw and has an end bent at an angle of 5-10 ° inside the inter-turn space with a length determined by a central angle of 10-15 °.

When this screw is made of two parts, the connector line which is from the end of the screw at a distance equal to 0.75-1.5 steps of the last turn.

FIG. 1 shows a screw feeder of pneumatic conveying installations, general view; in fig. 2 — node 1 in FIG. one; in fig. 3 is a view A of FIG. 2; in fig. 4 shows the node T in FIG. 1 (version of the last turn); in fig. 5 is a view B in FIG. four.

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The feeder contains a frame 1, on which the receiving chamber 2 is mounted, connected to the mixing chamber 3, having a check valve 4 and fitting 5, a cylindrical body

6 with an armored sleeve 7, inside of which the pressure screw auger 8 is driven by an electric motor 9. The bay 8 has a removable part 10.

The end portion of the last screw auger, defined by a central angle of 30-50®, is curved in an arc. The center of the arc is in the plane passing through the longitudinal axis of the screw, and is located on the surface of the screw shaft. The radius of the arc is 0.8-1.5 of the screw radius.

The end portion of the last screw auger can be made as shown in FIG. 4, 5.

The feeder works as follows.

Bulk material enters the chamber 2, where it is captured by the intake turns of the screw 8 and is fed into the sleeve

7 housing b, from where through valve 4 it is discharged into chamber 3. In chamber 3, the material is mixed with air entering through nozzle 5 (the system for supplying compressed air is not shown in the figures).

Due to the fact that the final part of the last screw auger is bent along the arc or located perpendicular to the screw axis and has an end bent inwards between the interturn space, it becomes possible to more evenly distribute the transported material over the output section, pressing in and> smoothing the distribution surface, forming a dust plug of uniform density, which helps to prevent the breakthrough of air from the mixing chamber into the screw channel. In addition, there is no penetration of the end portion of the coil into the already partially compacted transported material, which contributes to the reduction of its abrasive wear. The end flap at an angle of 5–10 ° helps reduce the pressure of the dust plug to the final section of the last turn of the pressure auger and, as a result, reduces its wear.

By improving the working conditions of the final section of the last screw auger, the working life of the pressure auger falls.

The use of the first or second variants of the final section of the coil depends on the physicomechanical characteristics of the transported material. Availability of removable parts. screw helps to accelerate the repair work.

Claims (3)

Claim 1. A screw feeder of a pneumatic installation that contains a reception chamber and a mixing chamber equipped with a non-return valve, interconnected by a cylindrical housing With a pressure screw located in it, characterized in that, in order to reduce the specific costs. energy to transport the material and increase the durability of the screw, the final section of the last screw auger, defined by the central angle of 30-50 °, is curved along an arc whose center is in a plane passing through the longitudinal axis of the screw and is located on the surface of its shaft, and its radius is 0 , 8: -1.5 radius of the screw. 2. Feeder on π. 1, characterized in that the final section of the last screw auger, defined by an angle of 30-50 °, is perpendicular to the longitudinal axis of the screw and has an end bent at an angle of 5-10 ° inside the inter-turn space with a length determined by a central angle of 10-15 °. • 3. Feeder popp. 1 and 2, which differs in that the screw is made of two parts, the connector line of which is located at the end of the screw at a distance of 0.75-1.5 steps of the last turn.