SU779211A1 - Pneumatic screw-type feeder - Google Patents

Description

(54) PNEUMATIC SCREW FEEDER

one

The invention relates to pneumatic conveying and can be used in various industries, for example in devices for spraying concrete.

Known pneumatic screw feeder, comprising a housing with a loading neck, mounted in the housing of the drive screw and the mixing chamber connected to a source of compressed air and the transport pipe 1.

The disadvantage of this feeder is that it does not exclude the possibility of breakthroughs of compressed air from the mixing chamber to the loading neck, as a result of which the efficiency of the feeder is reduced.

The purpose of the invention is to increase the efficiency of the feeder by eliminating the breakthrough of compressed air into the loading neck.

The goal is achieved by the fact that the last 1 -1.5 turns of the propeller blades are made elastic and not secured on its shaft.

In addition, seals are fixed on the last elastic turn of the auger blade.

FIG. 1 schematically shows a feeder, a longitudinal section (the dotted line shows the position of the last turns of the auger blade during compaction operation not shown); in fig. 2 - the last turn of the blade of the screw 5 with seals fixed on it.

The feeder includes a housing 1 with a loading neck 2, a driving screw 3, a mixing chamber 4 connected by a source of compressed air supply and a transport pipeline 5. At the driving auger 10, the last 1 -1.5 turns of the blade are made elastic and not fixed on the auger shaft. In the initial position, the last turns of the blade are closed. To ensure a more complete sealing at the last turn of the blade from the pipeline 5 side

15 seals 6 and 7 (fig. 2).

The operation of the feeder is performed next.

The material from the loading neck 2 20 is supplied by the driving screw 3 to the transport pipeline 5. In this case, the elastic part of the auger blade is pressed. Next, the material is picked up by a stream of compressed air, entering it into the mixing chamber, mixed with it and fed into the transport pipeline.

As the pipeline resistance increases, which can occur with local blockages, the pressure in the pipeline rises, the elastic turns of the auger blade tend to close, and a material plug is formed in the outlet part of the screw, which prevents the compressed air from breaking through into the loading neck. Under pressure, the blockage of the transport pipeline is eliminated. Immediately thereafter, the feed of the material by the screw is resumed. The presence of seals 6 and 7 increases the stopping capacity of the plug, thereby reducing the possibility of infiltration of compressed air into the loading neck area, and the conditions for the outflow of material are improved.

Claims (2)

1. A pneumatic screw feeder, comprising a housing with a loading mouth, a driving screw mounted in the housing, and a mixing chamber connected to a source of compressed air and a transport pipeline, characterized in that in order to increase its efficiency by eliminating the breakthrough of compressed air into the loading neck , the last 1 -1.5 turns of the auger blade are made resilient and not fixed on its shaft. 2. A feeder according to claim 1, characterized in that a seal is fixed on the last elastic turn of the auger blade. Sources of information taken into account during the examination 1. USSR author's certificate L 365313, cl. B 65 G 53 / 46,1969 (prototype).