SU1726335A2 - Worm feeder of pneumatic conveyer - Google Patents

Abstract

This invention relates to pneumatic conveying of granular and pulverized materials. The purpose of the invention is to increase the reliability of the screw feeder. Screw feeder contains receiving 2 and mixing 3 chambers connected by a cylindrical body 6 with screw 8 located in it with spiral turns 11. The end sections of the last turns of the screw are curved in arcs. On the end portion of the screw in the middle of its inter-turn space there is a balancing blade 10 with a bevel, made with the same parameters as the main winding of the screw. The intake end of the balancing blade is located from the end of the pressure screw at a distance of 1.0–1.2 of its winding pitch, and its pressure end is located in the same diametral plane with the end of the last turn of the screw. The pressure section of the balancing blade at a length of 0.1-0.3 steps from its end is bent along an arc with a radius of 1.5-2.0 of the radius of its coil, the center of which is located on the surface of the screw shaft. The material is moved by the screw 8 from the receiving chamber to the mixing 3, from where it is blown by compressed gas through the pipeline to the consumer. Placing a balancing blade in the interturning space of the winding screw allowed to create a sealing plug at the end of the screw and thereby increase the reliability of the feeder operation. 4 il. cl

Description

This invention relates to screw feeders of pneumatic conveying installations for transporting granular and pulverized materials.

The purpose of the invention is to increase the reliability of the screw feeder.

Fig 1 shows a screw feeder, general view; in fig. 2 — node I in FIG. one; in fig. 3 is a view A of FIG. 2; in fig. 4 shows a section BB in FIG. one.

The feeder contains a frame 1; in which a receiving chamber 2 is installed, connected to a mixing chamber 3 with a check valve 4 and a fitting 5 for supplying compressed air therein with a cylindrical body 6 with an armored sleeve 7, inside which a pressure auger 8 is driven by an electric motor 9.

The end portions of the last turns of the screw, defined by the central angles of 30-50 °, are curved along arcs of radii whose centers are in a plane passing through the longitudinal axis of the screw and are located on the surface of its shaft. The pressure screw at its end in the direction of the material supply section is equipped with a balancing blade 10, made in the form of a separate

VI

Yu

ON GO 00

SP

Yu

in the middle of the inter-turn auger space of a coil with a radius and pitch equal to the corresponding parameters of the coils 11 of the auger. The intake end of the balancing blade is located from the end of the screw shaft on the side of the mixing chamber at a distance of 1.0-1.2 of its winding pitch. The intake section of the balancing blade is made with a bevel placed in a plane parallel to the screw axis, inclined at an angle of 15-30 ° to the tangent drawn to the circumference of the auger shaft at the intersection point of the intake balance blade blade with it. The pressure end of the balancing blade is placed in the same diametral plane with the end of the latter in the direction of the material feed of the worm auger. The pressure section of the balancing blade on the length of its end, equal to 0.1-0.3 pitch of its winding, is bent towards the receiving chamber along an arc of a radius equal to 1.5-2.0 of the radius of its turn, with the center of the arc located on the surface the screw shaft in the plane passing through the screw axis and the pressure end of the balancing blade.

The feeder works as follows.

Bulk material enters chamber 2, where it is caught by coils 11 of the pressure screw auger 8 and fed through sleeve 7 of housing 6 and check valve 4 into mixing chamber 3, in which it mixes with air supplied through fitting 5 and is transported through a pipeline (not shown) ) to the place of storage.

The application of the invention allows to obtain a dust plug of the required density at the end portion of the pressure auger, to prevent the breakthrough of compressed air.

from the mixing chamber to the loading chamber and maintain a constant pressure in the transport pipeline, which increases the reliability of the screw feeder. Formula of the invention: Screw feeder of pneumatic conveying unit according to auth. Ms 755727, characterized in that, in order to increase reliability, the pressure screw at its end in the material feed direction is equipped with a balancing blade, made in the form of a separate centrally located interturn space of the screw of the turn with a radius and pitch equal to the corresponding parameters of the screw turns, the intake end of the balancing blade is located from the end of the screw shaft on the side of the mixing chamber at a distance of 1.0-1.2 of its winding pitch; the intake portion of the balancing blade is performed with a bevel placed in a parallel axis of the screw of a plane inclined at an angle of 15-30 ° to a tangent drawn to the circumference of the screw shaft at the intersection point with it of the intake end of the balancing blade, and the pressure end of the balancing blade is located in the same diametral plane with the end of the latter in the direction feed the material of the auger coil, and the pressure section of the balancing blade at a length from its end equal to 0.1-0.3 of its winding pitch, is bent towards the receiving chamber along an arc with a radius equal to 1.5-2.0 of the coil radius, from prices arc of arc located on the surface of the auger shaft in a plane passing through the axis of the auger and the pressure end of the balancing blade.

FIG. one

Fiel

Claims (1)

Claim Screw feeder for pneumatic conveying system according to ed. No. 755727, characterized in that. that, in order to increase reliability, the pressure screw at its end section in the direction of material supply is equipped with a balancing blade made in the form of a separate turn screw located in the middle of the turn space with a radius and pitch equal to the corresponding parameters of the screw turns, while the intake end of the balancing blade is located from the end face of the auger shaft from the side of the mixing chamber at a distance equal to 1.0-1.2 of its winding step, the intake section of the balancing blade is made with a bevel placed in parallel to the screw axis of the plane inclined at an angle of 15-30 ° to the tangent drawn to the circumference of the screw shaft at the point of intersection with the intake end of the balancing blade, and the pressure end of the balancing blade is placed in the same diametrical plane with the end of the screw conveyor, which is the last in the material feed direction, moreover, the pressure section of the balancing blade along the length from its end, equal to 0.10.3 of the step of its winding, is bent towards the receiving chamber along the arc with a radius equal to 1.5-2.0 radius of the coil, with the center of the arc located on the surface of the screw shaft in a plane passing through the axis of the screw and the pressure end of the balancing blade. FIG. 1 Fig a