US3869247A

US3869247A - Cooling pipe for use in satellite coolers of rotary kilns

Info

Publication number: US3869247A
Application number: US442085A
Authority: US
Inventors: Herbert Deussner
Original assignee: Kloeckner Humboldt Deutz AG
Current assignee: Kloeckner Humboldt Deutz AG
Priority date: 1973-02-14
Filing date: 1974-02-13
Publication date: 1975-03-04
Anticipated expiration: 1992-03-04
Also published as: DE2307108A1; DE2307108B2; GB1450621A; BE809525A; JPS49113236A; ES420901A1; FR2217652B1; JPS5713785B2; DE2307108C3; FR2217652A1

Abstract

The lifting blades or vanes on the interior of a cooling pipe of a satellite cooler are connected to the outer wall of the cooling pipe through the provision of blade feet which extend through metal lined recesses in the fireproof inner wall of the cooler, each foot having a pair of hollow portions with a common wall which includes an aperture aligned with an aperture in the outer pipe wall to receive a fastening bolt. The blade foot includes a flange for covering the recess and the connection of the blade foot with the outer wall of the cooling pipe prevents damage to the inner lining during cooler operation and during blade changing operations and provides for an easier disassembly and reassembly during blade changing operations.

Description

[ Mar. 4, 1975 United States Patent 1191 Deussner 5/1942 France 432/118 1 COOLING PIPE FOR USE IN SATELLITE COOLERS OF ROTARY KILNS Primary Eraminer-John J. Camby Attorney, Agent, or Firm-Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson ABSTRACT [22] Filed: Feb. 13, 1974 P N04 442,085 The lifting blades or vanes on the interior of a cooling pipe of a satellite cooler are connected to the outer [30] Foreign Application priority Data wall of the cooling pipe through the provision of blade Feb. 14, 1973 feet which extend through metal lined recesses in the 2307108 fireproof inner wall of the cooler, each foot having a pair of hollow portions with a common wall which includes an aperture aligned with an aperture in the outer pipe wall to receive a fastening bolt. The blade foot includes a flange for covering the recess and the 8 5 1.41% w 3 6 4N0 7F R I no 00 ml W N 1 5 2 u/ 1. "2 m 2 u" 3 u" 4 mm mm. 0C r ""3 U M C mk UIF .111 2 8 555 lll connection of the blade foot with the outer wall of the [56] References Cited cooling pipe prevents damage to the inner lining dur- UNlTED STATES PATENTS ing cooler operation and during blade changing operations and provides for an easier disassembly and reassembly during blade changing operations.

9 Claims 2 Drawing Figures COOLING PIPE FOR USEIN SATELLITE COOLERS OF ROTARY KILNS BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a cooling pipe, particularly for a satellite cooler on a rotary kiln, and is more particularly concerned with the prevention of damage to the fireproof inner lining and the connection of lifting blades or vanes about the inner wall of such coolers.

2. Description of the Prior Art In cooling pipes known in the prior art, particularly those used for satellite coolers, the lifting blades or vanes are fixed on supporting bodies which are rigidly connected with the pipe sleeve. These supporting bodies are so dimensioned, with respect to their height, that they form one surface with the inner lining of the cooling pipe. Furthermore, these known supporting bodies are tightly embedded in the inner lining of the cooling pipe, the lining being introduced only after fixation of the supporting bodies with the cooling pipe sleeve.

As the lifting blades in cooling pipes, particularly the lifting blades or vanes in cooling pipes for satellite coolers, are subjected both to high thermal stresses and to abrasive stresses by means of the material to be cooled, the wear on the lifting blades or vanes is relatively great. The lifting blades or vanes have therefore, only a relatively short life and must frequently be exchanged or renewed, respectively. The exchange of worn lifting blades or vanes, is, however, with these known constructions, and the fastening in the interior of the cooling pipe, connected with appreciable expenditures of time and money. Also, upon disassembly of the lifting blades or vanes which have become unusable, it is often found that the inner lining is frequently damaged or disturbed in the area of the fastening of the lifting blade or vane. In addition, in this known type of lifting blade fastening in cooling pipes, relative movements between the supporting bodies and the inner lining, which may lead to damage of the inner lining in the area of fastening of the lifting bodies or vanes during operation of the apparatus has not been prevented.

SUMMARY OF THE INVENTION The object ofthe present invention resides in the provision of a cooling pipe in which the disadvantages indicated above are prevented and the inner lining is protected, in the area of fastening of the lifting blades or vanes, from distortion and damage.

Attendant to this object is the provision of a longer cooling pipe life and an appreciable simplification of the mounting and dismounting of lifting blades or vanes during replacement of the same.

These objects are achieved in that the inner lining of a cooling pipe, in the area of the fastening of the lifting blades or vanes includes a recess which extends to the wall of the cooling pipe, through which recess at least one fastening foot of a blade or vane is disposed. The fastening foot is thereby connected to the outer wall of the cooling pipe so that in the area of the fastening of the lifting blade or vane with the pipe wall, the inner lining is not stressed, because of the recess, and the lifting blade or vane may be quickly exchanged and renewed in a simple manner, without thereby experiencing damage or distortion.

Furthermore, through the measures provided by the present invention, fastening of the lifting blade or vane through the recess in the inner lining provides a direct connection with the pipe wall, so that even with elastic deformations of the fastening of the blade or vane, or of the pipe sleeve, in the area of the fastening, does not result in damage, distortion or disturbance of the inner lining. As a very advantageous result, therefore, the deformations of the foot of a lifting blade or vane and of the pipe wall occurring through the effects of heat are taken into account to a fargoing extent and thereby the life of these elements and of the cooling pipe is increased.

In an advantageous development of the invention, the recess in the inner lining is lined with a metal sleeve. In this manner, the inner lining may be introduced or applied before the fastening of the lifting blades or vanes to. the pipe wall, which leads to an appreciable simplification and facilitation of the lining work or operation. In addition, by means of the metal sleeve in the recess, also the inner lining in this area is reliably insured with respect to damage or disturbance, both during operation as well as during dismounting of old and the mounting of new lifting blades or vanes.

In accordance with a further advantageous construction of the invention, the fastening foot of the lifting blade or vane is constructed to be: substantially hollow. This hollow construction of the fastening foot provides a decrease in material costs, as well as a simplification of the mounting and dismounting of the lifting blade or vane.

According to a further advantageous construction for the fastening of the foot of a lifting blade with the wall of the cooling pipe, a clamping bolt with a relatively long shaft is provided, the head of the bolt engaging the fastening foot at a distance spaced from the pipe wall. Therefore, the clamping bolt and spacing very advantageously provides an accommodation for the expansion and bending strains occurring during operation, wherein'these strains are transferred to the relatively long or elongate construction of the shaft of the bolt, or taken up by the shaft so that breaks between the head of the bolt and the shaft are prevented.

In order to protect the recess in the inner lining, particularly for protecting the edge of the, recess at the inner surface of the inner lining, in an advantageous further development of the invention, the fastening foot is provided with a flange which covers the recess of the inner lining.

According to a further and particularly suitable construction of the invention, the lifting blade or vane is provided on its front side and/or on its rear side with at least one projection which extends beyond the lifting blade surface. Very advantageously, a part of the material taken up by the lifting blade or vane is held back or discharged with a delay because of these projections which provides for a very favorable and uniform distribution of the material in the stream of gas conveyed through the cooling pipe and contributes to a great decrease in the wear of the lifting blade. The life of the lifting blade may therefore be substantially increased through the provision of such projections.

In a further development of the invention, at least one reinforcement rib is arranged on the rear side of the lifting blade. By means of such a reinforcement rib on the rear side of the lifting blade the strength of the lifting blade or vane is very advantageously substantially increased.

BRIEF DESCRIPTION OF THE DRAWING Other objects, features and advantages of the invention, its organization, construction and operation will be best understood from the following detailed description of a preferred embodiment of the invention, taken in conjunction with the accompanying drawing, on which:

FIG. 1 is a sectional view of a portion of a cooling pipe taken through a lifting blade having a fastening foot which is fixed to the pipe wall within a recess in the inner lining according to the invention; and

FIG. 2 is a sectional view taken generally along the line IIII of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a wall 1 ofa cooling pipe, for example a satellite cooler on a rotary kiln, is provided with a fireproof inner lining 2. The inner lining 2 is provided with recesses 3 (only one shown) which extend to the pipe wall 1 and which receive a fastening foot 5 carried by a lifting blade 4.

The fastening foot 5 extends through the recess 3 up to the pipe wall 1, a metal plate 11 as will be discussed below being disposed intermediate the foot 5 and the wall I.

The recess 3 is lined with a metal sleeve 6 and, as illustrated in FIG. 2, has a cross section, for example, in the shape of a rectangle.

The fastening foot 5 of the lifting blade 4 is constructed with inwardly extending walls so as to be essentially hollow. More specifically, the fastening foot 5 includes a pair of interiorly extending oppositely directed truncated cone-shaped hollow chambers 7 and 8, respectively, with a common wall 16. The bottom part of the fastening foot 5 (as viewed in the drawing) which forms the two hollow chambers 7 and 8 is so arranged in the blade foot that a space is provided between the common wall 16 and the outer wall 1. The common wall is provided with an aperture 9 which receives the head 17 of a relatively long shanked bolt 10 which, with a washer 18 and a nut 19 serves for fastening the foot 5 of the lifting blade 4 to the wall 1 of the cooling pipe.

The fastening foot 5 of the lifting blade 4 is disposed within the recess 3 on a metal plate 11 having an aperture therein for receiving the shank of the bolt 10.

The fastening foot 5 of the lifting blade 4 is also provided with a flange 12 which covers and protects the edge of the lining 2 which defines the recess 3 from damage.

The lifting blade 4 is provided, on its front side and on its rear side, with a plurality of

projections

13 and 14 which extend beyond their respective blade surfaces and which are arranged to extend somewhat in the axial direction of the cooling pipe. Furthermore, the lifting blade 4 has, on its rear side, a reinforcing rib 15 extending in the longitudinal direction of the blade.

Due to the fact that according to the invention the inner lining 2 has a recess 3 extending to the pipe wall, through which the fastening foot 5 of the lifting blade 4 passes and is fixedly connected to the pipe sleeve with the aid of a tightening screw or clamping bolt 10, a lifting blade which has become unusable may be disconnected very simply and quickly and replaced by a new lifting blade without damage or distortion being inflicted to the inner lining 2 in the area of the lifting blade fastening. In addition to this, very advantageously the relative movements positively occurring during operation between the foot 5 of the lifting blade 4 and the inner lining may be assumed or equalized by the bolt 10 and not transferred to the inner lining 2, so that during operation, even at quite high thermal and mechanical stresses, or strains, on the lifting blades, damage of the inner lining 2 in the area of the lifting blade fastening does not occur.

The metal plate 11 arranged between the fastening foot 5 of the lifting blade 4 and the pipe wall 1 very advantageously protects the wall 1 in this area from excessive strain or damage. Furthermore, through the hollow construction of the fastening foot 5 shown in FIG. 1, there very advantageously occurs a saving in material and the clamping bolt head received in the aperture 9 of the foot 5 is to a fargoing extent protected from thermal and abrasive influences. The head of the clamping bolt 10, may, in this hollow construction of the fastening foot 5 of the lifting blade 4, further and also very advantageously be protected from disadvantageous thermal and mechanical strains through filling of the hollow chamber 7 with a fireproof ramming or stamping mass. The life of the clamping bolt 10 is appreciably extended in this manner. In addition, the life of the lifting blade 4 may be appreciably increased, according to the invention, through the provision of the

projections

13 and 14 which extend beyond the surfaces of the front side and rear side of the blade. From the material filling lying in the pipe, or from the material trickling down from the blades located in the upper area of rotation, cushions of material are collected beyond a certain angle of rotationbetween the

projections

13 and 14, which cushions protect the lifting blade body 4 from wear. Furthermore, also the reinforcing rib 15 extending the length of the blade 4 on the rear side thereof contributes to the reinforcement and simultaneous lessening of wear of the lifting blade 4.

The recess in the inner lining of the cooling pipe according to the invention, as well as the construction and fastening of the lifting blade with the cooling wall is not limited to the embodiment shown by way of example in FIGS. 1 and 2. Thus, for example, the fastening foot 5 of the blade 4 may be constructed in other cross sections in addition to the rectangular cross section shown, for example in a cylindrical shape or the like. Also, the lifting blades, each according to size may be equipped with two or more fastening feet, without departing from the invention.

In the foregoing I have described a preferred and alternate constructions of my invention. Many changes and modifications, other than those set forth above, may become apparent to those skilled in the art without departing from the spirit and scope of my invention. I therefore intend to include within the patent warranted hereon all such changes and modifications as may reasonably and properly be included within the scope of my contribution to the art.

I claim:

1. A cooling pipe for a satellite cooler on a rotary kiln, comprising:

a pipe wall,

an inner wall having a fireproof lining,

a material lifting blade arranged on the inner wall,

a recess in said inner wall for said lifting blade, said recess extending to said pipe wall, a metal sleeve lining said recess, a metal plate between said sleeve and said pipe wall, an aperture in said pipe wall, a fastening foot on said blade, and a fastening device extending through said aperture to fasten said foot to said pipe wall. 2. A cooling pipe according to claim 1, wherein said fastening foot comprises a laterally extending flange disposed to cover said recess when said lifting blade is within said recess. 3. A cooling pipe according to claim 1, wherein said blade includes a reinforcing rib extending therefrom.

4. A cooling pipe for a satellite cooler on a rotary kiln, comprising:

a pipe wall, an inner wall having a fireproof lining, a material lifting blade arranged on the inner wall, a recess in said inner wall for said lifting blade, said recess extending to said pipe wall, an aperture in said pipe wall, a fastening foot on said blade, said fastening foot including a first hollow portion, a second hollow portion, a common wall between said first and second hollow portions, and an aperture in said common wall, and a fastening device to fasten said foot to said pipe wall, said fastening device including a bolt extending through said common wall aperture and said pipe wall aperture, said bolt including a head adjacent one of said apertures,

a threaded portion, and

a nut threadedly engaging said threaded portion adjacent the other aperture to clamp said foot to said pipe wall.

5. A cooling pipe according to claim 4, comprising a metal sleeve lining said recess,

a metal plate between said sleeve and said cooling pipe wall, and

an aperture in said metal plate aligned with said common wall and pipe wall apertures and receiving said bolt therethrough.

6. A cooling pipe according to claim 1, wherein said lifting blade comprises a least one projection extending from and beyond a surface of said blade to delay and provide a uniform discharge of material.

7. A cooling pipe according to claim 6, wherein said projection extends approximately in the axial direction of said pipe.

8. A cooling pipe according to claim 1 wherein said foot has a rectangular cross section as viewed perpendicular to said pipe wall.

9. A cooling pipe according to claim 8, wherein said foot has an X-shaped cross section as viewed in a direction of said pipe wall.

Claims

1. A cooling pipe for a satellite cooler on a rotary kiln, comprising: a pipe wall, an inner wall having a fireproof lining, a material lifting blade arranged on the inner wall, a recess in said inner wall for said lifting blade, said recess extending to said pipe wall, a metal sleeve lining said recess, a metal plate between said sleeve and said pipe wall, an aperture in said pipe wall, a fastening foot on said blade, and a fastening device extending through said aperture to fasten said foot to said pipe wall.

2. A cooling pipe according to claim 1, wherein said fastening foot comprises a laterally extending flange disposed to cover said recess when said lifting blade is within said recess.

3. A cooling pipe according to claim 1, wherein said blade includes a reinforcing rib extending therefrom.

4. A cooling pipe for a satellite cooler on a rotary kiln, comprising: a pipe wall, an inner wall having a fireproof lining, a material lifting blade arranged on the inner wall, a recess in said inner wall for said lifting blade, said recess extending to said pipe wall, an aperture in said pipe wall, a fastening foot on said blade, said fastening foot including a first hollow portion, a second hollow portion, a common wall between said first and second hollow portions, and an aperture in said common wall, and a fastening device to fasten said foot to said pipe wall, said fastening device including a bolt extending throUgh said common wall aperture and said pipe wall aperture, said bolt including a head adjacent one of said apertures, a threaded portion, and a nut threadedly engaging said threaded portion adjacent the other aperture to clamp said foot to said pipe wall.

5. A cooling pipe according to claim 4, comprising a metal sleeve lining said recess, a metal plate between said sleeve and said cooling pipe wall, and an aperture in said metal plate aligned with said common wall and pipe wall apertures and receiving said bolt therethrough.