SU968086A1

SU968086A1 - Bell furnace muffle

Info

Publication number: SU968086A1
Application number: SU813275620A
Authority: SU
Inventors: Павел Николаевич Смирнов; Исай Израйлевич Ошеверов; Владимир Васильевич Белан; Александр Николаевич Макаров
Original assignee: Магнитогорский горно-металлургический институт им.Г.И.Носова
Priority date: 1981-04-09
Filing date: 1981-04-09
Publication date: 1982-10-23

Description

(54) МУФЕЛЬ КОЛПАКОВОЙ ПЕЧИ(54) COUPL OVEN WALL

1one

Изобретение относитс к термической обработке металла в рулонах и может быть использовано в цехах, где установлены колпаковые нагревательные печи.The invention relates to heat treatment of metal in coils and can be used in workshops where bell-shaped heating furnaces are installed.

Известен цилиндрический муфель, имеющий продольную волнистость и кольца жесткости , расположенные на рассто нии одно от другого в осевом направлении, 1.A cylindrical muffle is known that has a longitudinal waviness and stiffening rings spaced apart from one another in the axial direction, 1.

Недостаток такого муфел в сложности его изготовлени , св занное с необходимостью иметь сложное и дорогосто щее оборудование дл создани продольной волнистости .The disadvantage of such a muffle is the complexity of its manufacture, due to the need to have complex and expensive equipment for creating longitudinal waviness.

Наиболее близким по техническому существу вл етс муфель колпаковой печи, выполненный в виде цилиндра с торцевой поверхностью. Муфель содержит поперечные гофры и короткие каналообразные элементы прикрепленные к цилиндру 2.The closest in technical essence is a muffle of a bell furnace, made in the form of a cylinder with an end surface. The muffle contains transverse corrugations and short duct-like elements attached to cylinder 2.

Однако известное устройство обладает недостаточным сроком службы из-за короблени боковой поверхности, от которого не защищают поперечные гофры и каналообразные элементы. Коробление боковых стенок, сокращающее срок службы муфел , св зано с наличием сжимающих напр жений , которые при нагреве муфел привод т к потере его формы, несмотр на различные усиливающие элементы.However, the known device has an insufficient service life due to warping of the side surface, from which transverse corrugations and channel-like elements do not protect. The warping of the side walls, which shortens the life of the muffle, is due to the presence of compressive stresses, which, when heated, cause the muffle to lose its shape, despite the various reinforcing elements.

Целью изобретени вл етс увеличение срока службы муфел .The aim of the invention is to increase the life of the muffle.

Поставленна цель достигаетс тем, что в муфеле колпаковой печи, выполненном в виде цилиндра с боковой и торцовой поверхностью , бокова поверхность муфел снабжена упорами, установленными вдоль образующей боковой поверхности цилиндра напротив друг друга и размещенными по периметру, причем упоры выполнены с фиксаторами и снабжены распорными планками , установленными между упорами и. выполненными из сплава, обладающего эффектом пам ти формы, например из нити15 нола.The goal is achieved by the fact that in the muffle of a bell-type furnace made in the form of a cylinder with a side and end surface, the side surface of the muffle is provided with stops installed along the side surface of the cylinder opposite each other and arranged along the perimeter, and the stops are made with latches and provided with spacers installed between the stops and. made of an alloy with a shape memory effect, for example, of a 15 nol thread.

Кроме того, упоры выполнены дугообразными .In addition, the stops are arcuate.

На фиг. 1 изображен муфель, общий вид; на фиг. 2 - сечение на фиг. 1 на фиг. 3 - вид упоров с распорными план20 ками.FIG. 1 shows a muffle, a general view; in fig. 2 is a sectional view in FIG. 1 in FIG. 3 - view of the stops with spacers.

Claims

The muffle consists of a cylindrical vertical side surface 1 and an end surface 2. On the side surface 1, vertical supports 3 and 4 are mounted opposite each other along the perimeter. The stops 3 and 4 are provided with clamps, which are a finger 5, which enters the stop hole. Spacers 6, made of metal with a shape memory effect, for example, nitinol, are installed between stops 3 and 4. The bars 6 in the initial state are arcuate with a chord length equal to the distance between the stops. The muffle is installed on the stand 7 of the bell-type heating furnace and closes the stack of rolls 8. The device operates as follows. The muffle is mounted on the stand 7 of the furnace, closing the roll of rolls 8. The spacer strips 6 made of nitinol are installed between the stops 3 and 4 and fixed from falling out with fingers 5. Then a heating cap of the furnace (not shown) is installed and the rolls of foot 8 are heated. In the process of heating, the arcuate spacer strips 6 tend to be straightened due to the shape memory effect that the nitinol strips 6 possess and act on stops 3 and 4. The spacer forces that arise during this will balance the compressive stresses in the muffle walls, prep formation of transverse folds on its lateral surface. The implementation of the arcuate-shaped strips facilitates their installation, especially in the case of the unevenness of the muffle's side surface and contributes to an increase in its service life. After the heat treatment of the rolls is completed, the heating cap is removed, the muffle and the spacer plates with the coil of the coils are cooled, and the plates take the original stable arcuate shape and the spacer forces become zero. The use of muffles of the proposed design provides an increase in their service life. Spacer strips of nitinol or another metal with a shape memory effect create tensile stresses to compensate for the compressive stresses of the weight of the muffle. Claims of the invention Muffle-bell furnace, made in the form of a cylinder with an end surface characterized in that, in order to increase the service life, it is equipped with stops installed on the perimeter of the cylinder opposite to each other with clamps and spacer plates placed between the stops and made of an alloy with an effect memory form. 2. A muffle according to claim 1, characterized in that the spacer plates are made of nitinol. 3. Muffle according to claim 1, characterized in that the stops are arcuate. Sources of information taken into account in the examination 1.Patent of Germany No. 1905433, cl. F 27 B 11/10, 1972.

2. The UK patent number 1361152, cl. F 27 B 11/10, 1974.