Furnaces – Including means to feed solid fuel – Movable grate
Reexamination Certificate
1999-09-18
2001-10-09
Ferensic, Denise L. (Department: 3749)
Furnaces
Including means to feed solid fuel
Movable grate
C110S327000, C110S268000, C267S160000, C126S180000
Reexamination Certificate
active
06298795
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This is the national stage of International Application No. PCT/EP98/01450 filed Mar. 12, 1998.
BACKGROUND OF THE INVENTION
Feeder grates, which are used as cooling grates or firing grates, consist alternately of stationary grate plates and transverse rows fo grate plates which can be moved forward and back in the feed direction. The rows of movable grate plates are supported, in total or in groups, by a movably mounted frame. Track rollers, which roll on a rail, are used for support. They are subject to high wear, which leads to an undesirable lowering of the movable grate plate rows relative to the stationary rows. It has been proposed (DE-C-38 44 493) to avoid this by support appliances which comprise a leaf spring on which the movable part of the grate is suspended so that it can oscillate. These support appliances have the disadvantage that the leaf springs must have a very long configuration so that the vertical component of the oscillating motion remains negligibly small. It is not only the space requirement associated with the great length of the leaf springs but also their large thermal expansion which causes difficulty. This thermal expansion leads to a lowering of the grate part and therefore affects the mutual positional relationship between the stationary and moving rows of grate plates.
SUMMARY OF THE INVENTION
The invention is based on the object of creating a supporting arrangement, which has a smaller space requirement and in which the change in position of the moving grate plates due to thermal expansion of the leaf springs is reduced.
This is achieved, in accordance with the invention by providing a plurality of leaf springs arranged adjacent to one another in such a way that in each case forces from the lower end of one leaf spring are transmitted into the upper suspension point of an adjacent leaf spring, on whose lower end the grate plate can be or is fastened. This gives an N or zigzag-type arrangement of the leaf springs and the members which transmit the force from the lower end of one leaf spring to the upper suspension end of the other leaf spring. As compared with the length of the leaf springs of known suspension arrangements, this length is subdivided among a plurality of leaf springs. The same movement distance is achieved with correspondingly less vertical expansion of the support appliance. The effective length with respect to thermal expansion is also correspondingly reduced, so that there is a corresponding reduction in the thermal expansion error in the positioning of the moving grate plate rows relative to the stationary grate plate rows.
It is expedient to connect more than two leaf springs together in the manner given so that the motion path necessary in total is distributed among more than two leaf springs. In consequence, the height of the appliance can be further reduced.
A particularly advantageous arrangement is one in which that leaf spring, on whose lower end the grate plate is to be fastened, is arranged between a pair of leaf springs holding it. A leaf spring, from whose lower end the forces are transmitted to the upper suspension end of the leaf spring first mentioned, is therefore located on each side of the leaf spring on which the grate plate is suspended.
A larger number of further leaf springs can be provided on both sides of the leaf spring which directly carries the grate plate, so that the movement distance is divided among a plurality of pairs of leaf springs.
In accordance with a special feature of the invention, those members which transmit the force from the pair of adjacent leaf springs to the upper suspension point of the spring carrying the moving grate plate are rigidly connected together. This also applies to the following pair, if present. It is expedient for the arrangement to be symmetrical.
The member which respectively transmits the force from the lower end of one leaf spring to the upper suspension point of another leaf spring can extend obliquely to the (vertical) direction of the leaf springs. It is, however, also possible to have a parallel arrangement of the leaf springs and the members connecting them.
Leaf springs packs, i.e. arrangement of springs which are jointly subject to the same loading and which deform jointly in parallel are also to be understood as being included in the concept of leaf springs.
The support appliance is expediently arranged in a special casing to protect it against mechanical and thermal effects. Thus the appliance can also be arranged within the cooler or firing casing.
The invention is explained in more detail below with reference to the drawing, which illustrates advantageous exemplary embodiments examples, and in which:
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Ferensic Denise L.
Rinehart K. B.
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