RU204671U1 - BREAKING ELEMENT - Google Patents

Abstract

The utility model refers to component (spare) parts and elements for rotary machines and impact mechanisms, such as hammer mills, namely tangential type MMT, axial type MMA, mine SHMT and others, hammer crushers, namely single-rotor type M-xx-xx and others, two-rotor type SMD, and so on, and others, where removable impact grinding elements are used - beaters, hammers, strikers, etc. A useful model refers to the components of devices for grinding various hard materials - stone and brown, lignite, building materials , chalk, ores, limestone, dolomite, magnesite, various rocks, waste and tailings, waste from the processing industry and others. The grinding wear element contains the impact part of the casting, the fastening part with lugs and a protective visor, and the main part of the structure consists of steel carbon C-shaped castings, presented in the form of a substrate, with a shock deposited on it th part made of wear-resistant material of high hardness, made along the main plane of the grinding element and along its side surfaces.

Description

The utility model relates to component (spare) parts and elements for rotary machines and impact mechanisms, such as hammer mills, namely tangential type MMT, axial type MMA, mine SHMT and others, hammer crushers, namely single-rotor type M-xx- xx and others, two-rotor type SMD and so on, and others, where removable impact grinding elements are used - beaters, hammers, strikers, and so on.

The utility model refers to the components of devices for grinding various hard materials - stone and brown, lignites, building materials, chalk, ores, limestone, dolomite, magnesite, various rocks, waste and tailings, waste processing industry and others.

Known hammers and beaters made of manganese wear-resistant steel, hardened by work hardening upon impacts, grades 110G13L, 110G13FTL, 110G13HML, 110G13H2BRL, 110G13HBRL, 120G10FL, 120G6ML, 130G14HMFAL and others.

The disadvantage of these castings for grinding relatively soft and medium-hard materials, including coal, chalk, limestone, etc., is a very low resource, since during operation the energy of impacts of the material against a hammer or hammer or striker is quite low, which does not fully allow perform proper work hardening of the steel.

The industry also produces grinding elements obtained by the simultaneous casting of two grades of materials - fasteners, such as ears, are made of carbon steel, and the impact part is made of wear-resistant steel or cast iron with high hardness. In particular, this design of the hammer is represented by descriptions of utility models RU No. 164151 (priority 19.04.2016, В02С 13/00 Bimetallic hammer of hammer mills, publ. 20.08.2016) and RU No. 164212 (priority 19.04.2016, В02С 13/00, Hammer mill beater, publ. 08/20/2016). The disadvantage of this technical solution is the low reliability of such grinding elements when hard rocks and non-crushing fragments hit during operation of the unit. In these cases, an avalanche-like destruction of the grinding elements of the rotor occurs.

Also known are the designs of hammers, beats and strikers made of castings and forgings of carbon steel with hardfacing with hard-alloy wires, electrodes or strips. These grinding elements have an increased resource in relation to similar castings from manganese wear-resistant steels. In particular, the design of the hammer with a deposited wear-resistant layer is presented by the description of the utility model RU No. 216171 (priority 06.03.1967, В02С 13/28, Beater for hammer mills, publ. 11.04.1968).

However, this known design has a weld surface on the back side of the hammer, and not on the working striking surface, and also does not have protective coatings and weld deposits on the lateral end surfaces of the grinding elements, and therefore it is characterized by uneven edge wear.

Especially this problem with the rapid wear of the outer rows of rotors is known in the operation of hammer mills and crushers. In terms of the shape of the hammer mill, U-shaped, L-shaped, C-shaped and S-shaped designs are known. In practice, all these options are found both in the form of castings from wear-resistant manganese steel, and castings from carbon steel with hardfacing. According to the known average statistical data (RD153-34.0-10.125-98), only the C-shaped structure has the best wear resistance. In this regard, and on the basis of the above, a new technical solution has been developed, which makes it possible to take into account the described disadvantages of the grinding elements and obtain a product, the technical result of which will be an increase in wear resistance and reliability.

The technical result is achieved due to the fact that a grinding quick-wear element (hammer, hammer, striker, etc.) of mills, crushers and other rotary impact units and machines made of carbon steel castings with a wear-resistant layer deposited on it has been developed.

The essence of the utility model is illustrated by the sketch of FIG. 1 and contains the following key design features:

1. Structurally, grinding elements are made in the form of steel carbon C-shaped castings;

2. On C-shaped castings, a wear-resistant layer is welded with hard-alloy materials not only along the main plane of the grinding element, but also along the side surfaces;

3. Grinding elements can be thermally treated by heating or cooling at low temperatures, laser or other treatment to reduce residual stresses after surfacing, which are additional centers of wear resistance loss.

The features of the grinding element manufacturing technology described in clause 3 are additional and depend on the actual production. Accordingly, the presence or absence of heat treatment, as well as its type, are not essential features that are entitled to separate patent protection by other persons.

Implementation of the utility model

FIG. 1 shows a sketch of the described utility model. The grinding quick-wear element contains a shock part 1 made of a deposited wear-resistant material of high hardness, the main part of the C-shape, presented in the form of a substrate 2, a fastening part 3 with lugs and a protective visor 4, made of low-carbon steel.

The grinding quick-wear element works in the composition of rotary machines and impact mechanisms designed for crushing or crushing of solid bulk materials. The grinding wear element is mechanically attached by means of lugs to the mating elements of the rotor of the grinding unit (such as beaters, discs, pins, bushings, etc.) and is a component that directly performs the function of crushing and crushing the material supplied for grinding.

When working as part of rotary machines and impact mechanisms, the grinding wear element is subject to wear, especially in its impact part. With the wear of the impact part of the grinding wear element, the gap between it and the housing of the grinding unit increases. In this case, due to the presence of a structural gap between the side surfaces of the grinding elements, accelerated wear of the side surfaces of the impact part of the grinding wear element occurs, which is characterized by pronounced edge wear.

To reduce the edge wear of the impact part, it is structurally provided for the surfacing of the side surfaces of the grinding high-wear element with hard-alloy wear-resistant materials.

The effectiveness of the proposal is an increase in the service life (operating time), a decrease in the effect of edge wear and an improvement in the reliability of grinding high-wear elements.

Claims (1)

Grinding quick-wear element containing the impact part of the casting, a fastening part with lugs and a protective visor, characterized in that the main part of the structure consists of a C-shaped steel carbon casting, presented in the form of a substrate, with a shock part welded on it made of wear-resistant material of high hardness , made along the main plane of the grinding element and along its side surfaces.

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