RU2474735C1 - Multi-purpose fire-proof fixing pin - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: multi-purpose fire-proof fixing pin is composite - on the one hand from strong fire-resistant phosphate concrete in a form of cylinder with semi-spherical head and on the other hand - metallic threaded pin cast in it, on which there is a spring washer with butterfly nut to attach the pin to furnace bearing framework. Metallic threaded part is cast into pin ceramic part during manufacturing.

EFFECT: damping of thermal extension of rigid and soft materials of lining for furnaces of different heating type at plant shutdown or replacement in the course of operation.

2 dwg

Description

The invention relates to the field of mechanical engineering, namely, to fastening means, for example, bolts, studs, screws and other rod fasteners.

A number of fixing refractory studs (anchors) produced by the English company Nelson ("Nelson®", Bolzenschweiss-Technik Gmbh & Co. KG (Germany), http://nelsonua.com/component/), made of special steels with a welded ring, are known to the stud with a special welding device during the installation of the lining.

The disadvantages of this invention are a rigid welded connection of the stud with the ring, which leads to a weakening of the fastening due to the greater thermal expansion of the metal of the stud compared with the thermal expansion of the ceramic lining, the destruction of the hard lining caused by the greater strength of the metal of the stud than the strength of the ceramic lining. In this case, the deepening of the metal stud into the lining material and the presence of metal leads to the formation of a thermal shunt with a loss of energy into the external environment.

A known refractory fastening pin manufactured by Keramomix LLC http://keramomix.net/, keramomix@yandex.ru, made of refractory ceramics with a support ring of the same ceramics, attached to the pin in the lock during installation of the lining.

The disadvantages of this invention are the low flexural strength of the support ring and the weakening of the joint strength during heating due to thermal expansion of the stud along the length.

The task is to create a design of a refractory fastening pin for connecting the inner surface of the furnace lining with an external frame, capable of damping the thermal expansion of hard and soft lining materials for furnaces of various types of heating.

The universal refractory stud is made integral - the ceramic part of the stud is made of refractory phosphate concrete in the form of a cylinder with

hemispherical head. The metal part is made in the form of a threaded rod, poured into the ceramic part during the manufacturing process. On the metal part there is a disk spring with a nut - a “lamb” for fastening the studs to the supporting frame of the furnace.

Figure 1 - refractory stud.

Figure 2 - mount refractory studs, section.

The universal refractory fastening pin is made integral - on the one hand, from refractory phosphate concrete in the form of a cylinder 1 (Fig. 1) with a hemispherical head 2 and, on the other hand, a metal threaded rod 3 embedded in it, on which a disk spring 4 with a nut is mounted - a “lamb” »5 for attaching the studs to the supporting frame 6 (Figure 2) of the lining 7 of the furnace.

Damping of various thermal expansions of the furnace lining, ceramic and metal parts of the stud is carried out as follows:

- the hemispherical head of the ceramic part of the hairpin of the required diameter allows a tight connection with the lining, while at the same time provides the hairpin with precession relative to the center line with a greater thermal expansion of the lining material than the thermal expansion of the ceramic part of the hairpin;

- axial expansion of the ceramic and metal parts of the stud is damped by a Belleville spring with the required characteristics, providing the necessary strength and density of the entire fastening connection;

- the length of the ceramic part of the stud is equal to the thickness of the lining;

- the length of the metal portion, drenched in ceramic fixing pin portion is not more than _^1/4 the length of the ceramic part of the stud;

- when these conditions are met, the ceramic part of the pin performs the function of a lining and does not act as a thermal shunt.

When assembling thermal units, including furnaces of various types of heating, the main difficulty is the fastening of the refractory lining to the metal frame of the furnace, caused by different coefficients of thermal expansion of the materials involved in the design. In this case, rigid ceramic lining (molded bricks, plates, etc.) require strong and flexible fasteners, while soft ceramic lining (products from fibrous materials) require fasteners with a large supporting surface.

The created design of the refractory stud is able to damp the thermal expansion of both hard materials and soft fibrous materials of linings for furnaces of various heating. It has ease of installation and / or replacement during operation and does not require special devices or operations for its use.

Claims (1)

A universal refractory stud made integral, characterized in that part of the stud is made of ceramic of durable refractory phosphate concrete in the form of a cylinder with a hemispherical head and a metal part in the form of a threaded stud, cast into the same concrete during the manufacturing process, and a disk spring with nut of the “lamb” type for fastening the stud to the supporting frame of the furnace.

Images