RU2236299C1 - Bead mill rubberized disk - Google Patents

Abstract

FIELD: mechanical engineering; materials grinding equipment.

SUBSTANCE: invention relates to fine grinding of hard materials. Proposed disk of bead mill consists of metal ring with hub and working part rubberized over entire surface, including perimeter of disk, and though holes to pass grinding bodies and ground material. Thickness of rubber layer is h≥(1.2-1.5)d where d is maximum diameter of grinding bodies.

EFFECT: improved reliability and efficiency and increased service life of dead mill rotor disk.

2 dwg

Description

The invention relates to techniques for fine grinding and dispersing solid particles in a liquid medium, and can be used in the paint and varnish, pharmaceutical, food, cosmetic industries, as well as in the processing of raw materials for the production of plant protection products, pigments, dyes, ceramics and other materials.

Known disk bead mill, made in the form of a metal ring containing a hub for mounting on the rotor of the mill and the working part with through holes (Gorlovsky I.A., Kozulin N.A. Equipment of plants of the paint and varnish industry. - L .: Chemistry, 1980, - p.299).

A disadvantage of the known design is the low service life due to intensive wear of the working part of the disk, which is under the constant influence of the flow of highly abrasive particles of grinding and bead material.

Closest to the proposed invention in technical essence and the achieved result is a bead mill disk containing a main metal ring with a hub for mounting it on the rotor of the mill and a working part rigidly attached to the outer side surface of the main ring and made of high-hard material - ceramic or ceramic. Moreover, the working part is made in the form of a ring with a width of H = (0.2-0.5) R, where R is the radius of the disk of the bead mill (AS No. 1766510 (Russia), class 02 02 17/16).

The disadvantages of the known design include low reliability due to the complexity of the mechanical connection of materials of heterogeneous nature such as metal and ceramics (as evidenced by a later copyright certificate of the same authors) and insufficient ceramic strength under the action of bending deformations. In this regard, the destruction of at least one ceramic disk will cause an avalanche destruction of all working disks placed on the rotor. In addition, it is well known that under shock loading (typical for bead mills) such highly hard, but brittle materials have low wear resistance and are prone to chipping due to the high level of contact stresses developing upon impact. Also, during impact interaction of materials close in hardness, such as ceramics and beads, the grinding and grinding of grinding media (especially glass, ceramics and porcelain) will be observed, which will reduce the dispersion efficiency of the main product and there will be a need for frequent replacement of the bead mass.

The aim of the present invention is to increase the reliability, durability and efficiency of the rotor disk of a bead mill.

To achieve this goal in the known design of the disk of the bead mill, made in the form of a metal ring containing a hub for mounting on the rotor of the mill and the working part, equipped with through holes, this working part is rubberized with rubber over the entire surface, including the perimeters of the disk and through holes, rubber thickness

where d is the maximum diameter of the grinding media.

An analysis of the features that distinguish the claimed technical solutions from existing features of the known technical solutions, did not find any similarities, which allows us to conclude that the claimed technical solution has significant differences.

Gumming the working part of the disk with rubber over the entire surface, including the perimeter of the disk and through holes, will reliably protect it from wear. In addition, due to the high chemical resistance of the elastomer, the metal ring is protected from corrosion and other chemical damage when interacting with an aggressive environment. Reliable fastening of the rubber coating to the reinforcement can be achieved by any well-known and affordable method. Due to the high flexibility and elasticity of the rubber, as well as the optimal thickness of the rubber layer, determined by the expression (1), the destruction of grinding bodies upon impact on the disk is excluded. This helps to preserve the initial structure of the bead mass and increase the efficiency of the grinding process.

Thus, in conjunction with the known new features give the claimed object a new, not cumulative, positive effect, because improve the reliability, durability and efficiency of the bead mill disc.

The invention is illustrated by drawings, where figure 1 shows a General view of the gummed disk, and figure 2 - its cross section along aa in figure 1.

The disk of the bead mill consists of a metal ring 1, containing a hub 2 and a working part 3, gummed with rubber 4 over the entire surface, including the perimeter of the disk and the perimeter of the through holes 5, intended for the passage of grinding media and grinding material.

Gumming of the disk is carried out by press or injection method with the help of resistant to swelling in a complex solvent and wear in the abrasive mass of rubber. Reliable fastening of rubber to metal fittings is achieved by using the highly efficient brass method or using special adhesives. Additional fastening is carried out due to rubber located along the perimeter of the disk and through holes, which connects both end gummed surfaces.

Flexural rigidity of the disk is ensured by metal fittings, which can be made of the cheapest grades of steel or made by injection molding of gray cast iron with sufficient mechanical strength.

The thickness of the rubber coating can be determined from the ratio

where d is the maximum diameter of the grinding media, because according to known data, only when this condition is met, the destruction of grinding media upon impact is eliminated by reducing the influence of the substrate. Preliminary calculations showed that at a recommended peripheral rotor speed of 10-15 m / s, the diameter of the bead balls 1-3 mm and a relatively low density of glass and porcelain, the thickness of the rubber layer can be only a few millimeters.

During the operation of a bead mill, particles of bead and grinding mass, which are under the influence of a rotor with disks, are carried away in a turbulent and laminar motion with swirls. In this case, the abrasive particles hit the working part of the disk coated with rubber 4. Due to the high flexibility of the rubber coating and, accordingly, a larger volume of deformed rubber, the level of contact stresses is significantly reduced. As a result of this, the wear rate of the bead mill disk is reduced, and the destruction and grinding of grinding media is also excluded. All these factors contribute to increasing the reliability, durability and efficiency of the bead mill disc. An additional economic effect from the implementation of the proposed technical solution can be obtained by increasing turnaround times, reducing the number of repairs and the consumption of spare parts.

Literature

Penkin N.S. Gummed machine parts. - M.: Mechanical Engineering, 1977.

Claims (1)

The disk of the bead mill, made in the form of a metal ring containing a hub for mounting on the rotor of the mill and the working part with through holes, characterized in that the working part of the metal ring is gummed with rubber over the entire surface, including the perimeters of the disk and through holes, while the thickness of the rubber layer h≥ (1.2-1.5) d, where d is the maximum diameter of the grinding media.

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