US3842763A

US3842763A - Traveling grate

Info

Publication number: US3842763A
Application number: US00393648A
Authority: US
Inventors: R Korting
Original assignee: Polysius AG
Current assignee: ThyssenKrupp Industrial Solutions AG
Priority date: 1972-12-05
Filing date: 1973-08-31
Publication date: 1974-10-22
Anticipated expiration: 1991-10-22
Also published as: BR7308941D0

Abstract

The invention concerns a traveling grate having grate bolts connected by means of chain members, the bolts supporting side plate members slidably guided within a stationary grate casing and in contact with a sealing strip subjected to the pressure of a spring.

Description

United States Patent 1191 1111 3,8 Korting Oct. 22, 1974 [54] TRAVELING GR TE 3,381,949 5/1968 Rowen 266/21 [75] Inventor: Reinhard Korting, Neubeckum, Germany 3,744,777 7/1973 Marsh 432/245 [73] Assrgnee: Poiyslus AG, Neubeckum, Germany FOREIGN PATENTS OR APPLICATIONS 1 Flledi 1973 634,650 3/1950 Great Britain 110/40 c [21] Appl. No.: 393,648

Primary Examiner-Kenneth W. Spraguc [30] Foreign Application Priority Data Assistant Exammer-1ames C. Yeung Dec. 5, 1972 Germany 7244502 Attorney Agent & Mcculloch [52] US. Cl 110/40 C, 34/242, 266/21,

432/121, 432/244, 110/40 E [57] BSTRACT [51] Int. Cl. F231) l/22 The invention concerns a traveling grate having grate [58] Field of Search 110/40 A-40 E; bolts connected by means of chain members, the bolts 17 266/20, 2 34/242 supporting side plate members slidably guided within a stationary grate casing and in contact with a sealing [56] References Cited strip subjected to the pressure of a spring.

UNITED STATES PATENTS 6 Cl 1 D F 2,852,244 9/1958 Rowen 266/21 'gure TRAVELING GRATE Traveling grate constructions known in the art have side plate members slidably guided within a stationary grate casing at their upper and lower edges. The upper edge of each side plate member is guided by a stationary upper slide rail, whereas the lower edge of the side plate member is supported by a sealing strip pushed upward by means of a spring. The side plate members of traveling grates are frequently subjected to very high temperatures because of the material located on the grate or because of the means of treatment (e.g., hot gases). Therefore, the side plate members are frequently subjected to a strong thermal expansion while the stationary grate casing undergoes comparatively little thermal expansion because of its substantially lower thermal load. Since the known construction prevents the downward movement of the sealing strip, possibly because of material located under it (caused by the vertical expansion of the side plate member), it is necessary to provide a comparatively large clearance between the side plate member and the upper stationary slide rail in its original (cold) state, in order to avoid jamming effects. However, this results in an increased loss of material and gas at that crack, with all the resulting difficulties.

A further disadvantage of the known traveling grate construction is the fact that the springs pressing against the sealing strip from below also must absorb the entire weight of the side plate members, in order to produce sufficient sealing pressure at the upper slide surface. Accordingly, the springs must be of extraordinarily strong construction. Finally, a further disadvantage is the comparatively poor access to such springs.

An object of the present invention is to avoid these aforementioned deficiencies of known constructions by providing a traveling grate of the type referred to and wherein a particularly reliable, trouble-free operating seal is provided. I

In accordance with the invention, the side plate members are provided with outwardly directed flanges one each below and above the grate bolt fasteners, whereby the lower flange pushes against a stationary slide rail of the grate casing, and the upper flange supports the sealing strip when the strip is subjected to spring pressure.

Since the traveling grate according to the invention no longer provides a seal directly at the upper and lower edges of the side plate members, but rather along the two outwardly directed flanges of the side plate members, the sealing zones are further removed from the high temperature region. Consequently, the resultant thermal expansions and the difficulties connected therewith are considerably less in the sealing zones.

Furthermore, the distance between both flanges and thus the distance to the two sealing surfaces in the embodiment according to the invention is considerably smaller than the total height of the side plate member (i.e., considerably smaller than the previous distance of the sealing surfaces). Also for this reason, considerably less thermal expansion occurs between the two sealing surfaces when the traveling grate of the invention is used.

Since the lower flange is carried by a stationary slide rail and the sealing strip is supported by the upper flange when under spring pressure, the springs are not subjected to the weight of the side plate members, but merely need to produce the sealing pressure within the range of the sealing strip. As a result, they can be made with comparatively small dimensions and are at the same time easily accessible at the new point of installation.

An embodiment of the invention is illustrated in the drawing which is a fragmentary, transverse sectional view of a traveling grate.

The traveling grate shown in the partial cross section contains a number of grate bolts 1 connected by sequentially adjacent chain members 2. These chain members 2 are supported by conveyor rollers 3.

Grate bolts I carry side plate members 4, which members laterally contain the material 5 located on the traveling grate. The side plate members 4 have two outwardly directed

flanges

4a, 4b, of which flange 4a is located above and flange 4b below the grate bolt fastener 6.

The stationary grate casing 7 (shown only in a cutaway section) contains a lower stationary slide rail 8 which supports the lower flange 4b of the side plate member 4. The upper flange 4a of side plate member 4 is enclosed by a projection 10 with a groove 11 in which sealing strip 12 can slide in a vertical direction. This sealing strip 12 is subjected to the effect of several springs, preferably two springs 13 arranged in longitudinal direction, which press sealing strip 12 toward the upper flange 4a of side plate member 4.

The stationarygrate casing 7 is provided with a cover plate 14 extending beyond the upper edge of the side plate member 4 with little clearance.

The lateral seal of the side plate member 4 against the escape of materials and gas, is provided on the one hand at gliding surface 15 between the upper flange 4a and the sealing strip 12, and on the other hand at gliding surface 16 between the lower flange 4b and the slide rail 8. Since these gliding surfaces are comparatively far removed from'the high temperature area, and the vertical distance between them is not great, it is possible for the relatively small thermal expansions occuring in the course of operation to be absorbed without difficulty by a vertical shifting of the spring loaded sealing strip 12. Springs 13 as well as the elements (e.g., 17) for adjusting the spring pressure are readily accessible from the outside.

The embodiment illustrated has the lower flange 4b of side plate member 4 arranged about at the height of the lower edge of said side plate member, and the upper flange 4a arranged still within'the lower half of said side plate member. Obviously, other constructions are also possible. However, it is essential that the vertical distance between

flanges

4a and 4b is kept as small as possible.

What is claimed is:

l. A traveling grate having an upstanding side plate at least at one side thereof; a stationary grate casing adjacent said side plate and having a slide rail; vertically spaced flanges carried by said side plate, the lower one of said flanges engaging said rail; a sealing strip carried by said casing in engagement with the upper one of said flanges; and spring means acting on said strip and yieldably urging it toward said upper one of said flanges.

2. A traveling grate according to claim 1 wherein said lower and upper flanges are sandwiched between said rail and said strip.

3. A traveling grate according to claim 1 wherein said side plate has a lower edge at a level corresponding substantially to the level of said lower flange and cover plate carried by said casing and overlying the upper, edge of said side plate with little clearance.

6. A traveling grate according to claim 1 wherein said spring means comprises a plurality of springs spaced longitudinally of said sealing strip.

Claims

1. A traveling grate having an upstanding side plate at least at one side thereof; a stationary grate casing adjacent said side plate and having a slide rail; vertically spaced flanges carried by said side plate, the lower one of said flanges engaging said rail; a sealing strip carried by said casing in engagement with the upper one of said flanges; and spring means acting on said strip and yieldably urging it toward said upper one of said flanges.

3. A traveling grate according to claim 1 wherein said side plate has a lower edge at a level corresponding substantially to the level of said lower flange and wherein the level of said upper flange is within the lower half of the height of said side plate.

4. A traveling grate according to claim 1 wherein said sealing strip is accommodated in a groove formed in said casing.

5. A travelIng grate according to claim 1 including a cover plate carried by said casing and overlying the upper edge of said side plate with little clearance.