SU1574457A1 - Screw extruder - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the production of ceramic extrusion products. The aim of the invention is to improve the quality of the products by eliminating the formation of the extrudate in the extrudate and increasing its uniformity in density and humidity. Screw press contains placed in the housing 1 auger 3 on the drive shaft 4. Between the press case 1 and the forming head 2, the forming disk 6 is rigidly fixed. On the additional drive shaft 11 located in the cavity 12 of the drive shaft 4, the pressure blades 7 and the knife are attached. with the surface of the forming disk 6. In the case of fastening the injection blades 7 and the knife directly on the drive shaft 4 of the screw 3, the number of the injection blades 7 must be not less than the number of entries of the evaporated blade 5 of the screw 3. Transported by the screw 3 clay The CCA is pushed through the holes of the forming disk 6 by the forcing blades 7 into the forming head 2, from which it emerges as a continuous bar. 3 hp f-ly, 6 ill.

Description

The invention relates to the building materials industry and can be used in the manufacture of clay bricks, stones and other products.

The aim of the invention is to improve the quality of the products by eliminating the formations of the extrudate and increasing its uniformity in density and humidity,

Fig, 1 shows the proposed screw press, the section; figure 2 - section aa in figure 1; on fig.Z - section bb in figure 2; figure 4 - section bb In figure 2; ia fig.Z - section bb n figure 2 (option for perpendicular p-th arrangement of the planes of the working surfaces of the injection blades to the axes of the holes of the forming disk); FIG 6 is a speck press, a variant with an additional drive shaft for (fastening the knife and forcing valves,

The screw press comprises a housing 1, a forming head 2, a screw 3 with a drive shaft 4 and an evaporating blade 5. A forming disk 6 is rigidly fixed between the press housing and the forming head, which contacts the delivery blades 7 and the knife 8. The forcing blades and knife rigidly mounted on the drive shaft of the auger and placed between the end of the discharge blade and the forming disk. The planes of the working surfaces 9 of the injection blades 7 form an acute angle with the plane of the forming disk 6 within 17-67g. The magnitude of the limiting values of this angle is determined by the conditions of mass capture by the injection blades and the ratio of the horizontal and vertical components of the normal force of the blade to the mass and the force of friction at the boundary between the mass and the blade. The knife 8 has a cutting edge 10 that contacts the surface of the forming disk 6. The screw press can be equipped with an additional drive shaft 1 for fastening the knife 8 and the forcing blades 7 located in the cavity 12 of the drive shaft 4 of the screw 3,

Lress works as follows.

The plastic ceramic mass entering the press is moved by the screw 3 and the discharging blade 5 to the injectors, the blade m 7. Each blade during its rotation separates a part of it from the incident mass flow and

0

five

O 5 5 50

five

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on itself, the mass is injected into the holes of the forming disk 6. The mass structure that is formed with its rotational movement under the influence of the screw is heterogeneous, it is completely destroyed, homogenized and flows into the forming head as separate flows through the holes of the forming disk. - ku. In the die, the individual mass flows are again combined, compacted, and after profiling in the die, the mass emerges from the press in the form of an extrudate or a workpiece. The extrudate has a homogeneous structure throughout the section with uniform density and humidity, and the structure is completely eliminated.

The presence of the forming disk does not introduce an additional resistance to the movement of the mass, since the mutual influence on the mass of the injection blades and the Lorming disk leads to the wedge effect and at the same time develops pressure sufficient to overcome all resistances. The latter also allows the process of plastic molding of products from the masses with low humidity. In the event that the mass contains fibrous inclusions, in order to eliminate their possible layering on the surface of the forming disk, use the knife 8, which by the cutting edge 10 slides along the surface of the disk and cleans it.

In order to ensure the consistency of the mass flow both before and after the forming disk, it is necessary to increase the speed of movement of the mass in the holes of the disk. This can be achieved when the number of injection blades is not less than the number of visits of the screw auger blades, or the press press is equipped with an additional drive shaft 11 for fastening the blade 8 and the pressure blades 7, and a cavity 12 is made in the drive shaft 4 of the screw 3 for accommodating the additional drive shaft 11.

In order to increase the pressure capacity of the press, the axes of the holes of the forming disk can be arranged perpendicular to the planes of the working surfaces of the injection blades, and the smallest spot size of the contact of the pressure blade with the forming disk 15744

Claims (1)

which may be not less than the diameter of the largest hole of the forming disk. Invention Formula 1, a screw press containing a core, a die with a forming head at the end, housed in the housing on the drive shaft of the screw with a discharge blade, and a knife, characterized in that, in order to improve the quality of products through liquidation. forming the extrudate and increasing its uniformity in density and humidity, it is equipped with a forming disk with holes and pumping blades in contact with it, each of which has a flat working surface, while the forming disk is rigidly fixed between the press body and the forming head and the delivery blades are placed between the auger blade of the screw and the forming disk at an angle of 17-67 ° to the surface of the latter. 7.6 1. The press according to claim 1, characterized in that the injection blades and the knife are rigidly mounted on the drive shaft of the screw, and the number of pump blades is not less than the number of visits of the screw blade of the screw. 3.Press according to claim 1, characterized in that it is provided with an additional drive shaft for fastening the knife and forcing blades, and a cavity is provided in the auger drive shaft for accommodating an additional drive shaft. 4. Press pop. 1, characterized in that, in order to increase the pressing capacity of the press, the axis of the holes of the forming disk are perpendicular to the planes of the working surfaces of the injection blades with the form (the disk is not less than the diameter of the largest hole of the forming disk. FIG. one B - B Phie.E A - A 7 6 FIG. AT B - in B - S Mm | I | I | I | I | I | 1 Fiyo.4