JPS58120076A - Axial fixing device for protective lining of rotary drum - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for supporting the axial thrust of the protective lining of a drum for the heat treatment of raw materials, in particular a cylindrical rotary kiln.

The protective lining of cylindrical rotary kilns is generally made of refractory brick lining. This refractory brick covers its entire inner surface, except for the strain joints, which are filled with a suitable mortar. This protective lining protects the metal rear wall body of the cylindrical rotary kiln from mechanical wear and thermal overload from hot raw materials to be processed, such as cement powder to be fired. In this case, the refractory bricks form a ring-shaped row in the circumferential force, and the plane of this row is perpendicular to the axis of the cylindrical rotary kiln, and because the cylindrical rotary kiln is slightly inclined, the axial thrust occurs. This thrust must be intercepted by suitable equipment. This axial thrust increases when the individual ring-shaped brick rows are not exactly perpendicular to the kiln axis or when sagging occurs in the brickwork and the brick rows are inclined.

This may result in different strain states between the kiln wall body and the brick masonry, for example when the brick masonry is heated faster than the kiln wall body or when the grafted material is cooled faster than the brick masonry. , a wedge effect occurs.

Literature 'Zement-Kalk-Gips' (
No. 2. 1975, p. 57), it is known to weld a ring thinner than the thickness of brick cladding to the inner surface of the graft body of a cylindrical rotary kiln. In this case, adjacent rows of bricks are supported on the narrow end face of the ring pointing towards the inlet end of the cylindrical rotary kiln.

Furthermore, in this embodiment, the axial thrust is
It is supported by a radially inwardly directed retaining projection of a ring-shaped kiln outlet protection segment adjoining the last row of bricks on the kiln outlet side. However, in this embodiment, since the individual brick retaining ring cannot support the axial thrust, a part of the retaining ring is mechanically destroyed by the part of the brick row that touches this brick retaining ring. For this purpose, the kiln outlet protection segment, even if it is made of heat-resistant steel casting,
The temperature of this part of the cylindrical rotary kiln is 700 to 10
Since the temperature reaches 00°C, its strength decreases significantly. Therefore, the retaining projections will bend outward due to the axial thrust. In this case, the last row of bricks on the exit side is
Subsequent movement onto the conical retaining protrusion structure results in the brick breaking.

It is therefore an object of the invention to provide a device for supporting axial thrusts, with which the protective lining, 9, can be fixed reliably and simply. This object is solved in a device of the type mentioned at the outset in that at least one retaining element is fixed to the graft of the drum and extends over most of the radial width of the protective lining. . As a result, the row of bricks adjoining the holding element is supported over a wide load surface of the holding element. This load surface can reliably absorb axial thrusts without being overloaded by local force concentrations. This retaining element can be designed in principle in any desired shape, but should preferably be designed so that it overlaps the entire thickness of the fire-resistant protective lining in axial projection.

In an embodiment of the invention, the holding element is formed in the form of a ring;
and is provided in a plane perpendicular to the rotation axis of the graft body. By orienting the force-transmitting surface of the retaining element in this manner, the retaining element is provided in the same way as the axial boundary surface of the row of bricks adjoining it. If the holding elements are arranged vertically, the brick rows are less likely to be laid diagonally, so that no wedging effect occurs.

In a further embodiment of the invention, the holding elements are small and consist of individual support plates arranged particularly uniformly over the circumference of the mounting body. Dividing the holding element into individual support plates is advantageous for maintenance and servicing operations. This is because only damaged or worn support plates can be serviced. Furthermore, the above-mentioned division avoids additional stresses, subject to temperature differences between the sleeve, the holding element and the housing body.

In a further embodiment of the invention, the retaining element is arranged in an annular recess of the protective lining, the remaining portions of which are filled with refractory material. In this way, the retaining element can be fitted as a substitute for a ring made of refractory bricks, so that a specially shaped molded brick to match the shape of the retaining element is unnecessary. Considering the strength, it is subjected to the action of high-temperature raw materials,
It is advantageous if the side of the holding element facing the kiln interior is made as narrow as possible and the remaining part of the annular recess is filled with refractory material. At the same time, only a relatively small cross-sectional area is used for the transfer of heat from the kiln interior to the housing body.

In a preferred embodiment of the invention, at least the co-walled body is provided with holes in the contact area of the ring. The holes in this area improve the cooling effect and limit the temperature of the ring carrying the support plate, especially in the areas which transmit forces to the mounting body and are mechanically heavily loaded.

Therefore, due to cooling in this area, the stability of the mounting body decreases by -4
Improve yourself.

Other features and advantages of the invention will become apparent from the description of the illustrated embodiments.

In Figs. 1 and 2, reference numeral 1 denotes a metal housing body of a cylindrical rotary kiln. The surface of the housing body facing the internal chamber 2 is provided with a protective lining 3 made of a fireproof material. Since the raw material to be processed in the kiln moves in the direction of arrow 4, the kiln is slightly inclined with respect to the horizontal in this direction.

The lining 3 is made of refractory bricks, as is known per se. This refractory brick covers the entire inner surface of the housing body 1 except for strain gaps. At a point 5 adjacent to the lower end of the kiln, i.e. on the raw material discharge side, the protective lining 3 is provided with an annular recess 6 extending over its entire circumference. The mounting body 1 is there,
It has holes 7 arranged at uniform intervals in the circumferential direction.

In the area of this hole 7, a ring 8 is welded to the inner surface of the housing body 1 so as to cover this hole. This ring is provided with a hole 9 which overlaps hole 7.

The hole 9 is closed on the inner surface side of the mounting body 1 by a cover plate 10.

Ring 8 carries a number of webs 11.

This web is welded to the ring 8 along its edges and extends approximately radially. The web 11 has in particular a radial dimension such that its boundary surface 12 on the inner side of the housing body 1 does not form a step with the protective lining 3 . However, the radial dimension of the web 11 can be shortened.

A support plate 13, formed in particular by a circular cutting method, is welded to said web 11. The surface of this support plate is perpendicular to the axis of the cylindrical rotary kiln, and this support plate has its boundary surface 13' on the side of the inner chamber 2 facing the protective lining 3.
and radial dimensions such that no steps are formed.

However, in this case as well, the radial dimension of the support plate 13 can be made slightly shorter.

The support plate 13 together with the web 11 supports the holding element 1 according to the invention.
form 4. This holding element conducts the axial thrust generated by the protective lining 3 into the housing body 1 via the support plate 13 and the ring 8, and the welded joint between the web 11 and the ring 8 transmits the force with respect to the axial thrust. It has no functionality. This welded connection therefore only needs to be formed taking into account the weight of each holding element 14.

Furthermore, the recess 6 is filled with a refractory material 15. Therefore, the protective linings opposite each other in this area!
Between the axial interfaces of l13, a step-free coupling region is formed.

In a preferred embodiment of the invention, the natural convection currents occurring due to the holes 7, 9 are further enhanced by a blower, not shown, so that very effective cooling is achieved. Since the heat conducted to the ring 8 through the support plate 13 made of heat-resistant steel casting is very effectively led out as described above, the strength and stability of the grafted body 10 are prevented from decreasing due to heat. It can be prevented.

Instead of one ring 8, a large number of such rings and retaining elements 14 can be provided axially spaced apart. As a result, the entire axial thrust that occurs is distributed over a large number of force absorption points.

Boundary surface 12°1 between the web 11 and the support plate 13 on the internal chamber 2 side
3' is placed within the refractory material 15, whereby the ring 8
The first,
The embodiment shown in FIG. 2 can be modified.

3 and 4 show a modification of the idea of the present invention. In this case, a brick retaining segment 16 is provided in the recess 6. The segments, as can be seen in particular from FIG. 4, are conically shaped and are arranged alternately upwardly and downwardly. The brick holding segment 16 is a hollow body, the shape of the internal space is small, and both sides of the coaxial direction coincide with the support body 17. This support is welded into the bore 7' of the housing body 1, is formed as a tube in the illustrated embodiment, and in the radial direction is a brick-retaining segment 16.
It passes through most of the area.

The brick retaining elements 16 on both sides of the interface of the recess 6 are
Each is held in the mounting body 1 by one bolt 18. Each of these bolts is supported by a support body 17 via one suppressing plate 19.

The part of the brick holding segment 16 facing the internal chamber 2 is provided with a hollow chamber 20 . A bolt 18 can be inserted from the side of this hollow chamber. The hollow chamber 20 is filled with refractory material after the bolt is inserted.

In this embodiment, a ring-shaped structure consisting of the brick retaining segment 16 and the support 17 forms the retaining element 21 according to the invention. If necessary, multiple holding elements 2
1 are arranged at intervals in the axial direction, and the protective lining 3 can be reliably fixed in the axial direction.

Since the suppression plate 19 is particularly provided with a plurality of openings, the heat transmitted to the support body 17 can be easily discharged. In this embodiment as well, natural convection can be assisted by a blower.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional view of the wall of a cylindrical rotary kiln with a holding element according to the invention, and FIG.
■ Membrane in section along line, opening; FIG. 3 is a partial longitudinal section of a cylindrical rotary kiln wall with another embodiment of the holding element according to the invention; FIG. 4 is a holding according to the invention. 1 is a partial cross-sectional view of a cylindrical rotary kiln wall with elements; FIG. Reference numeral 1 in the figure... Mounting body 3... Protective lining... Concavity 7.9... Hole 8... Ring 11... Web 13... Support plates 14, 21... Holding element 160/brick holding segment 17... support

Claims (1)

[Claims] 1. A device for absorbing the axial thrust of the protective inner ib of a drum for the heat treatment of raw materials, in particular a cylindrical rotary kiln, comprising at least one holding element (14, 21), Device characterized in that this retaining element is fixed to the wall body (1) of the drum and extends over a large part in the radial direction of the protective lining (3). 2. Patent 3, the holding element (14, 21) is characterized in that the holding element (14, 21) is formed in a ring shape and is provided perpendicularly to the axis of rotation of the wall body (1) and in one plane. 14) comprises at least individual support plates (l3
) The apparatus according to claim 1 or 2, characterized in that the inkstone is comprised of: 4. Device according to claim 3, characterized in that the support plate (13) is supported on a ring (8) fixed to the wall body (1). 5. Web (11) with support plate (13) extending in the axial direction
5. Device according to claim 4, characterized in that it is fixed to the ring (8) via. 6. The above, characterized in that the retaining element (14.21) is provided in the annular recess (6) of the protective lining (3), the other part of the recess being filled with a refractory material. Apparatus according to any one of claims 1 to 5. 7. Any one of the preceding claims 4 to 6, characterized in that at least the valve wall body (1) is provided with holes (7) in the area of contact with the ring (8). The device described in. 8. Device according to claim 7, characterized in that the wall body (1) and the ring (8) are provided with overlapping holes (7.9). 9. Retaining element (21) is a brick retaining segment} (16
), this brick holding segment is female, and the main body (1)
The device according to Patent No. 1 or No. 2, characterized in that the device is held by a support body [17] fixed to the device. 10. Brick retaining segment} (16) is the protective lining! )
9. A device according to claim 9, characterized in that the recess (6) of (3) is completely filled. 11. Support (17) is a brick holding segment} (16
11. A device according to claim 9 or claim 10, characterized in that it passes through most of the area.