SU952328A1 - Tubular mill armour lining - Google Patents

Description

The invention relates to armor linings of drum mills and improves the design of armor plates used in the cement, mining, coal and other industries in order to protect the mill body from impact abrasive wear and to ensure their technological performance, such as productivity and grinding fineness.

Known armored lining of a tube mill containing armor plates made with a flat, stepped, wavy or tapered wavy working surface 1J,

The disadvantage of these armor liners is that they have a low durability due to intense wear and sudden destruction.

According to its technological essence, closest to the invention is an arm grout of a tube mill, containing U-shaped plates with a curvilinear working surface and end walls of the base adjacent to the end walls of the armor plate in the opposite side of the armored lining 2,

The disadvantages of the known bronfu-tvki are cracking and heaving of armor plates, as well as their low resistance to abrasion.

The cracking and heaving of the armor plate occurs as a result of the working surface hardening. The armored plate is part of the armored lining and is surrounded, respectively, by armored plates. During operation, the working surface of the armored plates is ripped, t, e,

10, under the influence of shocks, the upper layers of the working surface work in a well-. VIEV of plastic deformation. As they deform, the gaps between the bodies of the armor plates are filled with 15 mol of metal and compression of broceptl begins on all sides around the perimeter of the working surface.

A simple increase in the gap between armor plates does not give a positive

20, as the mill body starts to wear out. There is an accumulation of energy on the working surface, while the non-working surface works under conditions of elastic stresses,

25

Claims (2)

When the maximum depth of work hardening is reached, which is determined by the shape of the body and the base of the armored plate, the increase in hardness of its working surface ceases. Thus, the armored plate is under periodic loading under conditions of elastic plastic deformation. Under these conditions, the high stiffness of the coopus armor plate causes cracking on the working surface in places with voltage concentrators, for example, between the waves and from the side walls. The armor plates are torn apart and fall out. In the event that a bolted joint is destroyed, by means of which the armor plate is attached to the building of the mill, it will bulge. Low wear resistance is determined not by the exhaustion of the plastic properties of the structural material during the work-hardening, but by the inability of the design of the armored plate to further deform, i.e. the destruction of the body of the armor plate occurs before: the extreme hardness of the surface layers is reached. The aim of the invention is to increase durability. This goal is achieved by the fact that in tube-type, mill grinders containing U-shaped plates with a curvilinear working surface and end walls of the base adjacent to the end walls of the armor plate in the opposite side of the armor plate, the base of the armor plate is made with a longitudinal edge connected to the end walls, with the latter in plan. a double-sided profile, with the armor plate and the longitudinal edge made with a common hole for the bolt of attachment,. FIG. 1 shows a cross-section of an armored mill; in fig. 2 - armor plate, side view; in fig. 3 - armor plate, top view; in fig. 4 shows a section A-A in FIG. The inside of the mill 1 is lined with armored plates 2 with working 3 and non-working 4 surfaces. The armor plate has a base of 5 I-beam pro l. The end walls b and 7 form the shelves of the base, and the longitudinal edge 8 with a hole 9 forms a stand. The armor plate is fastened to the mill drum by means of a bolt joint 10. In the course of operation, the working surface of the armor plate is subjected to wear and work hardening. In the process of work hardening, an overload of the longitudinal surfaces of the armored plate occurs. When the maximum load is reached, the armor plate is deformed, i.e. local deformation occurs, leading, respectively, to load reduction. The absence of lateral ribs in this design reduces the local stiffness of the body of the armor plate, thereby preventing its destruction. In addition, the implementation of armored plates of this design provides savings of about 10% of the metal with greater durability. The expected lifespan of the armored personnel carriers is 24-30 months. The economic effect from the introduction of the 3x14 m in the mill will be at least 25 thousand rubles. in year. Claims of the invention Bronefutero.vka tube mill, containing U-shaped plates with a curvilinear working surface with end walls of the base adjacent to the end walls of the armor plate with an opposite, armored base, characterized in that in order to increase durability, the base of the armor plate is made with a longitudinal edge connected to the end walls, forming an I-profile with the latter in plan, with the armor plate and the longitudinal edge being made with a common hole for the fastening bolt. Sources of information taken into account in the examination 1. Donchenko A, C. and other Handbook of mechanics ore dressing plant. M., Nedra, 1975, p. 122, fig. 1.76. 2.-USSR author's certificate number 631203, cl. B 02 C 17/22, 1977. , Fig.Z FIG.