Stock material or miscellaneous articles – Composite – Of metal
Patent
1996-06-03
1998-07-14
Beck, Shrive
Stock material or miscellaneous articles
Composite
Of metal
428698, 4289088, 427181, 427239, 427403, 164 14, 164 97, 295273, 29530, 264299, B05B 1504, B22D 1914, B05D 722
Patent
active
057801665
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a wear-resistant coating arrangement in a rotating gate feeder for the feeding of substantially particulate material. The gate feeder comprises a housing and a rotor and also an end cap at each end of the housing.
BACKGROUND OF THE INVENTION
In such gate feeders, or star feeders as they are also called, great wear occurs on the interior surface of the housing when the particulate material comes into contact with and scrapes along the interior surface of the housing. The greatest wear occurs when abrasive material is fed through the feeder whilst it operates at great air pressure differences, which causes "sandblasting" between the rotor blades and the housing. It is therefore common to equip the interior wall of the housing with a wear-resistant coating. This wear-resistant coating may be applied in thin layers of hard chrome, silicon carbide, tungsten carbide or similar, or may consist of a detachable lining of a wear-resistant material which is placed so as to fit closely against the interior wall of the housing. Detachable liners of this kind are known from GB Patent No. 1 182 992 and GB Patent No. 1 161 204. These detachable wear-resistant linings have the advantage that they can easily be replaced when they are worn out, but they have the disadvantage of having to be manufactured with great precision so as to fit inside the housing. They must therefore be manufactured in steel or another material which can readily be processed, and which thus does not have the same high degree of wear resistance. The requirement of precision means that these linings will also be expensive to manufacture. Moreover, the linings must be attached and locked into place with great care.
If the lining does not fit with precision inside the housing, it may move relative to the housing whilst the feeder is in operation, thereby increasing the wear rate considerably and the lining may break and cause damage to both the rotor and the housing.
SUMMARY OF THE INVENTION
To achieve greater wear resistance and to overcome the aforementioned disadvantages, by means of the present invention, a wear-resistant coating is provided which is cast directly on to the inner wall of the housing which faces towards the rotor, the housing inner wall functioning as an outer mould and with a purpose-adapted core as the inner mould.
The wear-resistant coating consists of a large proportion of granular and extremely hard particles which are held together by a castable binder. In this way, a highly wear-resistant surface is obtained which at the same time is rough and provides great through-flow resistance to air containing abrasive particles. In addition to great wear resistance, this solution therefore also provides reduced air leakage through the gap between the surface and the wings of the rotor. This results in reduced wear on the rotor wings.
By producing the wear-resistant coating in this way, a wear-resistant coating is obtained that is adapted with precision to the interior wall of the housing whilst the wear-resistant surface is adapted to the diameter of the rotor. The wear-resistant coating adheres with great strength to the interior wall of the housing and will not be able to fall out even when subjected to great mechanical stress.
To facilitate the removal of the the wear-resistant coating when it needs to be replaced, a release coating may be applied at certain points on the interior wall of the housing, prior to the wear-resistant coating being cast in place. The release coating weakens the adhesion to the interior wall of the housing. This means that when tools are used, such as a hammer and chisel or similar, the wear-resistant coating will become loosened in certain zones and be released on being broken into pieces.
The invention also relates to a method for providing a wear-resistant coating of this kind in that the wear-resistant coating is cast directly on to the interior wall of the housing which faces towards the rotor, with the housing functioning as an outer mould and wit
REFERENCES:
patent: 3202732 (1965-08-01), Braun et al.
patent: 5190091 (1993-03-01), Revankar
patent: 5194584 (1993-03-01), Leahy
AMECO International AS
Beck Shrive
Parker Fred J.
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