RU2069589C1 - Rubber member of spiral classifiers facing - Google Patents

Abstract

FIELD: mining, building and other branches of industry, separation of solid material by size and density in water medium. SUBSTANCE: rubber member of spiral classifiers facing is made as plate in the form of ring-type sector with located on its operational surface radial ribs with equal sided trapezium cross-section and also with blind grooves in between ribs space, in center of which there are through holes. Space H between supporting surface plane of blind grooves and ribs peaks plane is defined by H≥Δ+h_h+[l+D_h/2]•tgα with Δ is washer thickness, h_h - bolts heeds height, D_h - diameter of bolts heeds, l - space between axis of through holes and peak pf nearest rib, α - angle equal to elevation angle of classifier spiral. EFFECT: improved solid materials separation by size and density in water medium. 3 dwg

Description

 The invention relates to techniques for separating solid materials by size and density in an aqueous medium, and can be used in mining plants, enterprises of building materials, chemical industry and metallurgy.

A well-known rubber element of the lining of spiral classifiers, made in the form of a flat plate in the form of an annular sector with blind grooves and through holes located on its working surface, made in the center of the flat supporting surface of the grooves and designed, respectively, for mounting fasteners in the form of overhead washers and bolts [1 ]
A disadvantage of the known design of the rubber element of the lining of spiral classifiers is the low service life due to the intensive wear of its working surface and fasteners that are in the process of operation of the classifier under the constant influence of the abrasive mass of the transported material.

Closest to the proposed invention in technical essence and the achieved result is a rubber element of the lining of spiral classifiers, made in the form of a plate in the form of an annular sector with radial ribs located on its working surface with a cross section in the form of an equal-sided trapezoid and fasteners made in the form of a metal longitudinal Strips with holes located on the inside of the lining plate and bolts [2]
A disadvantage of the known construction of the rubber element is the increased metal consumption due to the presence of a metal strip embedded inside the lining plate. When the lining sector is worn out, this strip together with the worn part goes to waste, i.e. used once. The presence of this part also complicates the manufacturing technology of rubber elements, because before placing the metal strip inside the lining plate, it is subjected to technological processing, including the removal of wrapping paper, washing the grease, sandblasting, degreasing the surface, brassing, washing and drying. The purpose of these technical operations is to secure the metal fastener to the rubber during the vulcanization of the lining.

 The aim of the invention is to increase durability and reduce the metal consumption of the rubber element of the lining of spiral classifiers.

To achieve the goal in the known design of the rubber element of the lining of spiral classifiers, made in the form of a plate in the form of an annular sector with radial ribs located on its working surface with a cross section in the form of an equal-sided trapezoid, as well as blind grooves and through holes made in the center of a flat supporting the surface of the grooves and, respectively, designed to accommodate fasteners in the form of washers and bolts, these grooves are placed in the intercostal space, while standing between the plane of their supporting surface and the plane of the vertices of the ribs
H≥ Δ + h _g + [l + D _g : 2] • tgα,
where Δ is the thickness of the washers;
h _{g the} height of the bolt head;
D _{g the} diameter of the bolt head;
l the distance between the axis of the through holes and the top of the nearest rib;
a angle of elevation of the helix of the classifier spiral.

 Analysis of the essential features that distinguish the claimed solution from the essential features of the known technical solutions showed that rubber elements of the lining of spiral classifiers are known, the fastening of which to the spiral tape is carried out using washers and bolts [3, 4] However, in the known designs of the elements of the lining of the washers are placed in the inner part lining plates and only their single use is allowed. The process described above also coincides. Thus, these elements have the same disadvantages as the lining of the prototype structure.

The execution of the rubber elements of the lining of spiral classifiers in the form of plates in the form of annular sectors with radial ribs located on their working surface with a cross-section in the form of an equal-sided trapezoid and blind grooves with through holes made in the center of their flat supporting surface and designed, respectively, to place fasteners in in the form of washers and bolts, as well as the placement of these grooves in the intercostal space with the condition
H≥ Δ + h _g + [l + D _g : 2] • tgα,
where H is the distance between the plane of the supporting surface of the grooves and the top of the ribs;
Δ washer thickness;
h _{g the} height of the bolt head;
D _{g the} diameter of the bolt head;
l the distance between the axis of the through holes and the top of the nearest rib;
a angle of elevation of the helix of the classifier spiral will protect the heads of the fixing bolts and washers from wear and thereby increase the lining durability. The placement of fasteners on the working surface of the lining plates will allow them to be used repeatedly and thereby reduce the metal consumption of the lining and simplify the technology of its manufacture. Therefore, in combination with the known new features give the claimed object a new, not cumulative positive effect, because allow to increase durability and reduce the metal consumption of the lining. Thus, the distinguishing features of the claimed object are essential and useful.

 Figure 1 shows the rubber element of the lining; FIG. 2, section AA in FIG. 1; figure 3 diagram of the interaction of the working surface of the lining element with a movable abrasive material.

The lining element 1 is made of rubber that is resistant to wear in the abrasive mass. On its working surface there are radial ribs 2 with a cross section in the shape of a trapezoid. On the same surface in the intercostal space there are blind grooves 3 with a flat supporting surface 4, in the center of which there are through holes 5, designed respectively for mounting the washers 6 and bolts 7. Using these elements, the lining sector is attached to the spiral tape 8. The distance between the plane of the supporting surface 4 of the grooves 3 and the vertex 9 of the ribs 2 is determined from the expression:
H≥ Δ + h _g + [l + D _g : 2] • tgα,
where Δ the thickness of the washers 6;
h _{g the} height of the bolt head 7;
D _{g the} diameter of the bolt head 7;
l the distance from the axis of the through hole 5 to the top 9 of the ribs 2;
a angle of elevation of the helix of the classifier spiral.

 The interaction of the elements of the lining with abrasive material is as follows.

откуда
H≥ Δ+h_г+[l+D_г:2]•tgα.
При выполнении этого условия крепежные элементы будут целиком располагаться в "теневой зоне" и тем самым защищены от износа. За счет этого достигается повышение долговечности футеровочных элементов.During the rotation of the spiral, the abrasive material with the help of radial ribs 2 is held on the working surface of the lining and protects it from wear due to the self-lining effect [2] In this case, a “shadow zone” 10 is formed behind the top of each rib, overlapping the intercostal space from the top of the previous rib to the base next. According to figure 3 in this area are the fasteners of the lining of the head of the bolts 7 and washers 6. These elements will be protected from wear if the upper boundary 11 of the "shadow zone" 10 is located above their contour. Given that the upper boundary 11 is parallel to the vector of the peripheral speed of the spiral, i.e. located to the surface of the lining plate at an angle a, from the design scheme of figure 3 we get
H ≥ AB + BC,
Where

where from
H≥ Δ + h _g + [l + D _g : 2] • tgα.
When this condition is met, the fasteners will be entirely located in the "shadow zone" and thereby be protected from wear. Due to this, an increase in the durability of the lining elements is achieved.

 Due to the external arrangement of fasteners, it becomes possible to reuse them, which reduces the metal consumption of the lining. At the same time, the technology of manufacturing the lining is also simplified, its cost is reduced and the quality is improved.

Information sources
1. Mining Congress Journal, June 1972, p. 91.

 2. Copyright certificate of the USSR N 1793970, cl. B 03 B 5/52, 1993.

 3. Copyright certificate of the USSR N 1641427, cl. B 03 B 5/52.

 4. Copyright certificate of the USSR N 1217477, cl. B 03 B 5/52.

Claims (1)

The rubber element of the lining of spiral classifiers, made in the form of a plate in the form of an annular sector with radial ribs located on its working surface, with a cross-section in the form of an equal-sided trapezoid, as well as blind grooves with through holes, respectively designed to accommodate fasteners in the form of washers and bolts characterized in that the through holes are made in the center of the blind grooves, while the blind grooves are located in the intercostal space, and the distance H between the plane of their supporting the surface and the plane of the vertices of the ribs performed
H = Δ + h _g + [l + D _g / 2) • tgα,
where Δ is the thickness of the washers;
h _{g the} height of the bolt head;
D _{g the} diameter of the bolt head;
l the distance between the axis of the through holes and the top of the nearest rib;
a angle equal to the angle of elevation of the helix of the classifier spiral.

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