Heating – Tumbler-type rotary - drum furnace
Patent
1996-11-01
1998-03-31
Bennett, Henry A.
Heating
Tumbler-type rotary - drum furnace
432104, 34108, F27B 700
Patent
active
057331154
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a rotary drum, such as a rotary kiln, which is suspended substantially concentric within a live-ring by means of, at both sides of the live-ring, axially extending brackets, preferably arranged in pairs, which are retained by the live-ring, and which at their free ends bear against the end surfaces of retaining elements fixed to the shell of the drum, in such a way that the vertical load of the drum relative to the drum shell is transmitted tangentially to the live-ring.
A rotary drum of the aforementioned kind is known for example from the EP patent specification No. 0 325 189. This known rotary drum is suspended within a live-ring which on its internal periphery is provided with teeth, and which by means of washer plates fixed between the live-ring teeth support the rotary drum via retaining elements which are fixed to the drum shell by welding. The washer plates which extend transversely to the live-ring between its teeth and axially outwards at both sides of the live-ring, are retained between the live-ring teeth with the aid of wedges.
The disadvantage of utilizing a live-ring which is internally equipped with teeth is that such a live-ring is relatively expensive to manufacture and also to repair in the event of tooth fracture. Furthermore, the above described device con not without replacement of the live-ring be used for modernization of older existing kiln plants where typically a live-ring of the so-called migrating type is being used, i.e. where the rotary drum migrates within the live-ring across its internal periphery during the rotation of the live-ring, or, in other words, where there a relative mutual rotation between the rotary drum and the live-ring occurs during operation. A further disadvantage of the known device is the inherent difficulty of inspection and maintenance in that some of the parts of the device are concealed under the live-ring, this being a complicating factor in terms of accessibility. Furthermore, the dismantling of the known device which is necessary in case of maintenance work is required is complicated by the fact that all stationary parts are fixed by welding.
SUMMARY OF THE INVENTION
It is the objective of the present invention to provide a rotary drum by means of which the aforementioned disadvantages are eliminated.
This is achieved by means of a rotary drum of the kind described in the introduction, and being characterized in that the brackets evenly distributed over the circumference of the live-ring are fixed to the side faces of the live-ring.
Hereby, the live-ring can be manufactured with a smooth cylindrical inner face without teeth, which, in addition to being advantageous from an economic viewpoint, also makes it possible to use existing live-rings of the migrating type. Also, it will be less difficult to gain access to the parts of the device during inspection and maintenance work since none of the parts are concealed under the live-ring.
To further facilitate the work in connection with the assembly and maintenance of the device it is preferred that the brackets are fixed to the live-ring by means of bolts. These bolts may be fixed in threaded holes provided in the live-ring, but, both for reasons of construction and economy, it is preferred, however, that the bolts via through-going holes in the live-ring retain brackets on both sides of the live-ring.
The device may be configured with a retaining element for each bracket. It is preferred, however, that the retaining elements are formed with two oppositely-pointing end faces which are used to support separate brackets. Hence, the end faces are alternately used to support separate brackets when, during live-ring rotation, the retaining element is moving downwards and upwards, respectively. As mentioned in the introduction, the brackets are preferably fixed in pairs and therefore, for practical reasons, the number of retaining elements should correspond to the number of the bracket pairs.
It is further preferred that the free ends of the b
REFERENCES:
patent: 2198820 (1940-04-01), How
patent: 3950043 (1976-04-01), Endersen
patent: 4030878 (1977-06-01), Kunath
patent: 4094628 (1978-06-01), Rasmussen et al.
patent: 4171949 (1979-10-01), Endersen et al.
patent: 4265031 (1981-05-01), Kirchhoff
patent: 4344596 (1982-08-01), Hjaeresen
patent: 4403952 (1983-09-01), Birch et al.
Bennett Henry A.
F.L. Smidth & Co. A/S
Lu Jiping
LandOfFree
Rotary drum suspended within live-ring does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotary drum suspended within live-ring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary drum suspended within live-ring will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-46510