RU2298470C2 - Granulating auger apparatus - Google Patents

Abstract

FIELD: equipment for granulating plastic masses, mainly such as clays.

SUBSTANCE: apparatus includes housing whose cavity is enlarged in front of outlet window with molding grid; auger mounted in said housing in driven shaft having blades for cleaning grid. Enlarged cavity is in the form of cone enlarging towards grid with total surface area of openings no less than surface area of the least flow-through cross section of press in front of cone. Blades for cleaning grid are pumping ones; they have working surface inclined by acute angle relative to surface of grid.

EFFECT: improved operational reliability and efficiency of press for extruding homogenous granulated extruded products.

2 cl, 3 dwg

Description

The invention relates to equipment for granulating plastic masses, mainly clay.

A screw press is known, comprising a housing with a forming grid in the exit window, a screw located in the housing on the drive shaft with blades for cleaning the grate and forcing blades with a flat working surface located at an acute angle to the surface of the grate, and the press is equipped with a forming head at the end of the housing ( see AS of the USSR No. 1574457, class B28B 3/22, publ. 1990).

The disadvantages of the solution are the high resistance of the forming lattices and heads, as well as the filling of the press in the presence of solid inclusions in the material.

A granular screw press is known, including a housing with an enlarged cavity in front of the exit window with a forming grill, a screw located in the housing on the drive shaft with blades for cleaning the grill, the cavity being made in the form of separate cavities, and curved grooves for accommodating the cutting element are located on the end of the screw shaft (blades for cleaning the grate) (see USSR AS No. 1562148, class B28B 3/22, publ. 1990).

The disadvantages of the solution adopted for the prototype are its low reliability and productivity in the processing of clays with a large number of solid inclusions, the abrasion of even fragile inclusions is not ensured, the accumulating cavities are quickly filled, the resistance increases and the press is filled.

The objective of the invention is the creation of a reliable press that provides high performance in obtaining a homogeneous granular extrudate by preventing the filling of the press.

The objective of the invention is achieved in that in a granulating screw press containing a housing with an enlarged cavity in front of the exit window with a forming grill, a screw located in the housing on the drive shaft with blades for cleaning the grill, the enlarged cavity is made in the form of a cone expanding towards the grill with a total area holes, not less than the area of the passage section of the press in front of the cone, and the blades for cleaning the lattice are made forcing.

Another difference is that the discharge blades are mounted on the screw shaft with a shear fastening element.

Figure 1 shows a press, a longitudinal section; figure 2 is a section aa in figure 1; figure 3 is a section bB in figure 2.

The screw press comprises a housing 1, a screw 2 on the drive shaft with blades 3 for cleaning the forming grill 4 installed in the outlet window of the housing 1, with an enlarged cavity 5 in front of the forming grill 4. The enlarged cavity 5 is made in the form of a cone 6, expanding towards the grill 4 with a total area of the holes, not less than the area of the smallest passage section 7 of the press. The blades 3 are made pumping, due to the flat working surface located at an acute angle β to the surface of the grill 4. To increase reliability and prevent breakdowns, the blades 3 are mounted on the shaft of the screw 2 with a shear fastening element 8.

Screw press operates as follows. The material, mainly clay, enters the press casing 1 and is conveyed by the screw 2 through the cross-section 7 to the forming lattice 4. Mixing, plasticization of clay occurs, and when forcing through the forming lattice 4 - granulation. Small solid clay inclusions are abraded between the injection blades 3 and the grill 4 and pressed, and strong large foreign inclusions are pushed to the periphery and accumulate in the cavity 5 of the cone 6. Since the cavity 5 is single and not isolated from the main passage, the material moves in it, different layers at different speeds, is abraded and passes through the lattice 4. With a large accumulation of non-crushed inclusions, they can be removed by removing the lattice. The increased area of the lattice 4 and, accordingly, the total area of its openings provides, even with a large number of solid inclusions, a low resistance to the movement of plasticized clay - an extrudate, which prevents the mass from turning in the housing without relative axial movement (filling). When large, strong foreign inclusions get in, the fastening element 8 is cut off and the blades 3 stop, which prevents them from breaking and the lattice 4.

The press provides reliable operation and high productivity in obtaining a homogeneous granular extrudate.

Claims (2)

1. A granulating screw press comprising a housing with an enlarged cavity in front of the exit window with a forming grill, a screw located in the housing on the drive shaft with blades for cleaning the grill, characterized in that the enlarged cavity is made in the form of a cone expanding towards the grill with a total area of holes , not less than the area of the smallest passage section of the press in front of the cone, and the blades for cleaning the grate are made forcing with a working surface located at an acute angle to the surface of the grate. 2. The granulating screw press according to claim 1, characterized in that the discharge blades are mounted on the screw shaft with a shear fastening element.

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