SU561861A1 - Lined industrial furnace element - Google Patents

Description

one

The invention relates to metallurgical production and can be used for large heating and thermal furnaces.

The lined elements of an industrial furnace include shutters for closing working windows, withdrawable under, vras, under ring furnaces, etc.

The bowl flaps are, in all, manufactured from cast iron and, from the working space of the furnace, are lined with chamotte kripich or by packing with a refractory mass Ij. Such flap designs are typically used for small windows. In addition, irregular heat loads are warped, resulting in chipping of the refractory lining and disruption of gas density.

Also known is the door with the door frame of an industrial furnace, the frame of which consists of three parts. The outer part (in the direction of bulk, door types) is a closed, non-dried frame made of T-profile, to which the other parts are attached independently of each other, and with the help of telescopic spring elements - the inner plate, closing the opening of the window, and It can be mixed parallel to itself 2. However, doors of similar design are used only for low-temperature furnaces (300-400 ° C).

Also known is a fused furnace element, such as a flap, containing ash, and a frame, cast plates attached to it and a refractory lining, which is retained on the frame

cast plates. The cast plates are fastened by means of loose bolts with washers that are evenly spaced along the entire length from the side of the slab adjacent to the frame 3.

The disadvantage of the known element is its fragility due to the fact that the buckling of the cast plates, arising from its thermal stress, causes the frame to buckle. The distortion of the frame violates the gas-tightness of the furnace, and in places where the combustion products are knocked out, intense destruction (burnout) of the cast edging of the working window of the furnace and the flap occurs.

The purpose of the invention is to exclude distortion of the frame. This is achieved by the fact that the ends of the cast plates, adjacent to the frame, are rounded, with the radius of the round equal to the thickness, not the plate, and the washers with a semi-cylindrical surface on the side,

contacting with the frame.

By eliminating warping of the frame, the durability of the movable lined elements of an industrial furnace is increased. Plate attached to the frame only by its

edges, boxing, ne exerts additional effort on the frame, since rounding to

the end of the side of the slab adjacent to the frame allows the slab to roll under the action of bending forces when it is warped, and a loose bolt, which does not disrupt the tightness, also rolls along the semi-cylindrical surface of the bolt head or washer.

FIG. 1 shows the furnace flap on the lining side; in fig. 2 is the same; the section along A-A in FIG. one; in fig. 3 - plate molded framing, mounted on the frame; in fig. 4 — unit of fastening the slab to the frame by means of bolts; in fig. 5 - the same plan view.

The shutter for closing the working window of an industrial furnace comprises a frame 1 of box-type and cast plates 2 of rectangular shape attached to the frame with bolts 3. The cast plates 2 form a cassette in which the refractory lining is placed. On plates 2, on the ends of face 4 adjacent to frame 1, i.e., at the junction of plates 2, rounding 5 with a radius equal to the thickness of face 4 is made, from the center lying on the plane of face 4, distant from frame 1. Geometric axis O - About rounding parallel to the end face of the face 4 adjacent to the frame 1. Lita stove

2 is attached to the frame with two rows of bolts 3 located at the ends of the face 4 adjacent to the frame 1. The bolts 3 are set so that their axes are perpendicular to the geometric axis O-O of rounding and lie in the same plane with it. In the frame 1, at the location of the bolts, oval holes 6 are made, the major axis is oriented parallel to the long side of the cast plate 2. The small diameter of the hole 6 is larger than the diameter of the bolt

3 the amount to ensure its free landing. The large diameter of the hole 6 ensures the linear movement of the bolt when the plate 2 is warmed. Between the head 7 of the bolt 3 and the frame 1 there is a semi-cylindrical shroud 8. The plates 2 are located relative to each other with a gap that provides a linear change in their sizes.

The proposed valve is mounted on an industrial furnace. Under the influence of high

The temperature of the furnace working space. The cast plates 2 are heated and change their shape and size. Due to the different heat loads acting on the plate 2 along its length, this one bends, as is conventionally indicated by the dotted line in FIG. 3. The edge of plate 2 by rounding 5 rolls over the surface of frame 1. Bolt 3 moves in hole 6, transforming the curvilinear movement of plate 2 along the surface of frame 1 into straight line. The washer 8, without disturbing the tight fit, also rolls, thus preventing the bolt from bending, and therefore its destruction. As a result, the frame 1 does not experience loads caused by the distortion of the plate 2.

Claims (3)

1. Kasenkov M. А. Heating devices for blacksmith production. M., Mashgiz, 1962, p. 221-226. 2. The Swiss patent jNg 480604, cl. F 27d 1/18, 1969. 3. Drawings No. 168577, No. 175012, CENTROENERGOMETALLURGPROM, 1960. iili Tt $ u Ji -IJ / 1- / i FIG. 3 "W Fig ..: 5