US3841829A - Traveling grate for heat treating materials - Google Patents
Traveling grate for heat treating materials Download PDFInfo
- Publication number
- US3841829A US3841829A US00393809A US39380973A US3841829A US 3841829 A US3841829 A US 3841829A US 00393809 A US00393809 A US 00393809A US 39380973 A US39380973 A US 39380973A US 3841829 A US3841829 A US 3841829A
- Authority
- US
- United States
- Prior art keywords
- side plate
- slots
- plate members
- grate
- holes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23H—GRATES; CLEANING OR RAKING GRATES
- F23H11/00—Travelling-grates
Definitions
- ABSTRACT A traveling grate for heat treating materials having an endless chain grate with lateral side plates to convey the materials on its upper strand through a heat treating chamber and wherein the chain grate is provided with upstanding side plate members at its lateral edges, each of the side plate members having therein vertical slots open at their upper ends to permit thermal expansion and contraction of such members.
- Traveling grates of the endless chain type are employed in heat treating procedures of widely different kinds of goods, for example, crude ore, cement raw meal, or fertilizer, whereby these materials might be processed in granular form or as pellets.
- the material to be treated is conveyed on the upper strand of an endless chain grate through the heat treating chamber, which may have a gas temperature range between 800 l,200 C.
- the lateral side plate members being higher than the chain members of the chain grate, have considerably less protection or none at all from these temperatures, since the layer of the material slopes at the lateral edges as a result of friction at the wall, and thus cannot protect the upper edges of these side plate members at all or at least only very incompletely.
- the space beneath the upper strand of the chain grate is exposed to temperatures between 200 600 C, so that at least the upper side of the side plate members facing the heat treating chamber are subjected to a considera bly stronger heating than is the lower side of the side plate members facing away from the heat treating chamber. It follows, therefore, that high thermal stresses occur within the side plate members, which stresses could easily lead to a destruction of the side plate members, which in turn wouldcause undesirable interruption of the operation.
- An object of the present invention is to construct a traveling grate of the type referred to and wherein destruction of the side plate members of chain grates caused by thermal stress is largely prevented.
- the side plate members are provided with slots to accommodate expansion and contraction at the side facing the heat treating chamber.
- FIG. 1 is a simplified partial cross section of a traveling grate according to the invention.
- FIG. 2 is a side elevation view of a side plate member according to the invention.
- FIG. 1 illustrates merely that portion of the traveling grate-equipment l of the invention, through which upper strand 2 of a continuously revolving chain grate 3 is conveyed perpendicularly to the plane of the drawing.
- a layer of material 4 is located on the top side of the upper strand 2, which material is conveyed through the heat treating chamber 5 located above the upper strand 2 of the chain grate where gas temperatures of approximately 800 l,200 C prevail, whilegas temperatures of approximately 200 600 C prevail in the region below the upper strand 2 of the chain grate.
- the chain members 6 (with grates) sequentially adjacent to each other in the direction of motion of chain grate 3, are linked to each other by means of grate bolts 7 (merely indicated by a center line), whereby, depending upon the width of the traveling grate, a corresponding number of chain members 6 are arranged side by side on the grate bolt 7.
- the lateral edges of the grate chain 3 have side plate members 8, 8, which are linked to each other with their ends overlapping by means of grate bolts 7 in the same manner as are the chain members 6.
- side plate members 8, 8" extend to a higher level than that of the chain grate members 6 whereby a lateral boundary is formed for the layer of material 4 which slopes slightly in this boundary region.
- Lateral walls la and lb of traveling grate equipment 1 furthermore contain channels 9, 9' for guiding the chain grate 3 with its lateral edges, including side plate members 8, 8'.
- FIG. 2 illustrates a single side plate member 8 in side elevation; side plate members 8' on the other lateral edge of chain grate 3 are constructed likewise, but in mirror symmetry.
- Side plate member 8 contains in its lower half boreholes l0, 10' for providing a flexible connection of successive neighboring side plate members 8, as well as for accepting the grate bolts.
- the side plate members For purposes of providing the side plate members, despite great differences in temperature between their top and bottom sides (with respect to the top and the bottom sides of the upper strand 2 of the chain grate), with a comparatively large resistance to great thermal stresses, i.e., to enable them to accept large thermal stresses without breaking, the side plate members are provided at their upper edge 11, at the side facing heat treating chambers, with slots 12 to accommodate expansion and contraction.
- the number of such expansion slots l2 will generally depend upon the size of the chain grate and thus upon the size of the side plate members; the embodiment illustrated provides for two slots 12.
- the expansion slots 12 provided in the upper half of side plate member 8 are located between two vertical planes 10a and 10'a, which traverse the center axes of the pivoting point, in this instance the center axes of the boreholes 10, 10'. It is advantageous for the expansion slots 12 to be located a distance A away from vertical planes 10a and l0a, said distance A corresponding at least to the radius of boreholes l0, 10' of side plate member 8.
- Each expansion slot 12 is open at the top side 11 of side plate member 8, and in this instance runs about perpendicular to the side plate member, said slot having a length L of approximately 0.3 to 0.5 times the value of the total height H of the side plate member 8.
- the side plate member 8 illustrating the invention is only slightly weakened by the construction and arrangement just described of the slots 12 to accommodate expansion and contraction. For side plate members that are more heavily stressed, it is possible to compensate any resulting weakening without difficulty, by providing suitable reinforcing ribs.
- individual side plate members are advantageously shaped at the longitudinal axis such that sequentially adjacent side plate members interlock, thus forming on both sides an almost smooth surface covering slots 12 to prevent the escape of gases. Such forming furthermore makes the individual side plate members more rigid.
- Traveling grate for heat treating materials conveyed through a treatment chamber comprising a continuous chain grate; and elongate upstanding side plate their upper ends to accommodate expansion and contraction.
- each of said side plate members has a pair of holes for the reception of bolts, and wherein said slots are located in the upper half of each side plate member and between the two vertical planes traversing the center axes of said holes.
- traveling grate according to claim 2 wherein said expansion slots are located at a distance away from said vertical planes corresponding at least to the radius of said holes of the side plate member.
- each of said side plate member extends to a level higher than that of the chain'grate, and wherein said slots have a length approximatelyOfi to 0.5 times the value of the total height of the side plate member.
- Traveling grate for heat treating materials conveyed through a treatment chamber comprising a continuous chain grate; and upstanding, elongate side plate members at the lateral edges of said chain grate and having their adjacent ends in overlapping relation, each of said plate members being alike and having a body provided adjacent its opposite ends with a pair of spaced apart holes therein for the reception of bolts, each of said plate members having therein a pair of spaced apart slots extending from the upper edge of said plate member toward but terminating short of the lower edge thereof, said slots being located between said holes, the locations of said holes and the locations of said slots being such that the overlapping ends of adjacent plate members cover said slots.
Abstract
A traveling grate for heat treating materials having an endless chain grate with lateral side plates to convey the materials on its upper strand through a heat treating chamber and wherein the chain grate is provided with upstanding side plate members at its lateral edges, each of the side plate members having therein vertical slots open at their upper ends to permit thermal expansion and contraction of such members.
Description
United States Patent 1191 Korting TRAVELING GRATE FOR HEAT TREATING MATERIALS [75] Inventor: Reinhard Korting, Neubeckum,
Germany [73] Assignee: Polysius AG, Neubeckum, Germany [22] Filed: Sept. 4, 1973 [21] Appl. No.: 393,809
[30] Foreign Application Priority Data Oct. 17, 1972 Germany 7238025[U] [52] US. Cl 432/245, 432/243, 266/21, 1 10/40 C [51] Int. Cl. F23b 1/22 [58] Field Of Search 432/137, 251, 247, 248, 1 432/243, 245; 266/21; 110/40 R, 40 C [56] References Cited UNITED STATES PATENTS 1,700,366 1/1929 Fahrenwald 432/243 11 1 3,841,829 1451 Oct. 15, 1974 2,006,612 7/1935 Williams 432/243 2,045,646 6/1936 Harris 432/245 2,279,689 4/1942 Lerner 432/243 3,322,414 5/1967 Boron 266/21 3,393,904 7/1968 Taylor 432/243 3,420,512 1/1969 Irvine, Jr. et a1. 266/21 3,548,763 12/1970 Farber 266/21 3,563,520 2/1971 Muller 432/245 Primary Examiner-John .1. Camby Assistant Examiner-Henry C. Yuen Attorney, Agent, or Firm-Learman & McCulloch 57] ABSTRACT A traveling grate for heat treating materials having an endless chain grate with lateral side plates to convey the materials on its upper strand through a heat treating chamber and wherein the chain grate is provided with upstanding side plate members at its lateral edges, each of the side plate members having therein vertical slots open at their upper ends to permit thermal expansion and contraction of such members.
6 Claims, 2 Drawing Figures TRAVELING GRATE FOR HEAT TREATING MATERIALS Traveling grates of the endless chain type are employed in heat treating procedures of widely different kinds of goods, for example, crude ore, cement raw meal, or fertilizer, whereby these materials might be processed in granular form or as pellets. The material to be treated is conveyed on the upper strand of an endless chain grate through the heat treating chamber, which may have a gas temperature range between 800 l,200 C. Whereas the individual members of the chain grate are protected from these high temperatures by the layer of the material to be treated, the lateral side plate members, being higher than the chain members of the chain grate, have considerably less protection or none at all from these temperatures, since the layer of the material slopes at the lateral edges as a result of friction at the wall, and thus cannot protect the upper edges of these side plate members at all or at least only very incompletely. On the other hand, the space beneath the upper strand of the chain grate is exposed to temperatures between 200 600 C, so that at least the upper side of the side plate members facing the heat treating chamber are subjected to a considera bly stronger heating than is the lower side of the side plate members facing away from the heat treating chamber. It follows, therefore, that high thermal stresses occur within the side plate members, which stresses could easily lead to a destruction of the side plate members, which in turn wouldcause undesirable interruption of the operation.
An object of the present invention is to construct a traveling grate of the type referred to and wherein destruction of the side plate members of chain grates caused by thermal stress is largely prevented.
in accordance with the invention, the side plate members are provided with slots to accommodate expansion and contraction at the side facing the heat treating chamber. By locating these expansion slots in the upper portion of the side plate members, it is possible to reduce thermal stress considerably so that resulting destruction of the side plate members and subsequent interruption of the operation of the traveling grate can belargely eliminated.
An embodiment of the invention is shown in detail in the following description and drawings wherein:
FIG. 1 is a simplified partial cross section of a traveling grate according to the invention; and
FIG. 2 is a side elevation view of a side plate member according to the invention.
For purposes of simplification, FIG. 1 illustrates merely that portion of the traveling grate-equipment l of the invention, through which upper strand 2 of a continuously revolving chain grate 3 is conveyed perpendicularly to the plane of the drawing. A layer of material 4 is located on the top side of the upper strand 2, which material is conveyed through the heat treating chamber 5 located above the upper strand 2 of the chain grate where gas temperatures of approximately 800 l,200 C prevail, whilegas temperatures of approximately 200 600 C prevail in the region below the upper strand 2 of the chain grate. The chain members 6 (with grates) sequentially adjacent to each other in the direction of motion of chain grate 3, are linked to each other by means of grate bolts 7 (merely indicated by a center line), whereby, depending upon the width of the traveling grate, a corresponding number of chain members 6 are arranged side by side on the grate bolt 7. v
The lateral edges of the grate chain 3 have side plate members 8, 8, which are linked to each other with their ends overlapping by means of grate bolts 7 in the same manner as are the chain members 6. As can be readily seen from the drawing, side plate members 8, 8" extend to a higher level than that of the chain grate members 6 whereby a lateral boundary is formed for the layer of material 4 which slopes slightly in this boundary region. Lateral walls la and lb of traveling grate equipment 1 furthermore contain channels 9, 9' for guiding the chain grate 3 with its lateral edges, including side plate members 8, 8'.
FIG. 2 illustrates a single side plate member 8 in side elevation; side plate members 8' on the other lateral edge of chain grate 3 are constructed likewise, but in mirror symmetry. Side plate member 8 contains in its lower half boreholes l0, 10' for providing a flexible connection of successive neighboring side plate members 8, as well as for accepting the grate bolts.
For purposes of providing the side plate members, despite great differences in temperature between their top and bottom sides (with respect to the top and the bottom sides of the upper strand 2 of the chain grate), with a comparatively large resistance to great thermal stresses, i.e., to enable them to accept large thermal stresses without breaking, the side plate members are provided at their upper edge 11, at the side facing heat treating chambers, with slots 12 to accommodate expansion and contraction. The number of such expansion slots l2 will generally depend upon the size of the chain grate and thus upon the size of the side plate members; the embodiment illustrated provides for two slots 12. The expansion slots 12 provided in the upper half of side plate member 8 are located between two vertical planes 10a and 10'a, which traverse the center axes of the pivoting point, in this instance the center axes of the boreholes 10, 10'. It is advantageous for the expansion slots 12 to be located a distance A away from vertical planes 10a and l0a, said distance A corresponding at least to the radius of boreholes l0, 10' of side plate member 8. Each expansion slot 12 is open at the top side 11 of side plate member 8, and in this instance runs about perpendicular to the side plate member, said slot having a length L of approximately 0.3 to 0.5 times the value of the total height H of the side plate member 8.
The side plate member 8 illustrating the invention is only slightly weakened by the construction and arrangement just described of the slots 12 to accommodate expansion and contraction. For side plate members that are more heavily stressed, it is possible to compensate any resulting weakening without difficulty, by providing suitable reinforcing ribs.
In conclusion it should also be mentioned that individual side plate members are advantageously shaped at the longitudinal axis such that sequentially adjacent side plate members interlock, thus forming on both sides an almost smooth surface covering slots 12 to prevent the escape of gases. Such forming furthermore makes the individual side plate members more rigid.
What is claimed is:
1. Traveling grate for heat treating materials conveyed through a treatment chamber comprising a continuous chain grate; and elongate upstanding side plate their upper ends to accommodate expansion and contraction.
2. Traveling grate according to claim 1 wherein each of said side plate members has a pair of holes for the reception of bolts, and wherein said slots are located in the upper half of each side plate member and between the two vertical planes traversing the center axes of said holes.
3. Traveling grate according to claim 2, wherein said expansion slots are located at a distance away from said vertical planes corresponding at least to the radius of said holes of the side plate member.
4. Traveling grate according to claim 1 wherein each of said side plate member extends to a level higher than that of the chain'grate, and wherein said slots have a length approximatelyOfi to 0.5 times the value of the total height of the side plate member.
5. Traveling grate according to claim 4 wherein said slots extend perpendicularly from the upper edge of said side plate member.
6. Traveling grate for heat treating materials conveyed through a treatment chamber comprising a continuous chain grate; and upstanding, elongate side plate members at the lateral edges of said chain grate and having their adjacent ends in overlapping relation, each of said plate members being alike and having a body provided adjacent its opposite ends with a pair of spaced apart holes therein for the reception of bolts, each of said plate members having therein a pair of spaced apart slots extending from the upper edge of said plate member toward but terminating short of the lower edge thereof, said slots being located between said holes, the locations of said holes and the locations of said slots being such that the overlapping ends of adjacent plate members cover said slots.
Claims (6)
1. Traveling grAte for heat treating materials conveyed through a treatment chamber comprising a continuous chain grate; and elongate upstanding side plate members at the lateral edges of said chain grate, each of said side plate members having slots threin open at their upper ends to accommodate expansion and contraction.
2. Traveling grate according to claim 1 wherein each of said side plate members has a pair of holes for the reception of bolts, and wherein said slots are located in the upper half of each side plate member and between the two vertical planes traversing the center axes of said holes.
3. Traveling grate according to claim 2, wherein said expansion slots are located at a distance away from said vertical planes corresponding at least to the radius of said holes of the side plate member.
4. Traveling grate according to claim 1 wherein each of said side plate member extends to a level higher than that of the chain grate, and wherein said slots have a length approximately 0.3 to 0.5 times the value of the total height of the side plate member.
5. Traveling grate according to claim 4 wherein said slots extend perpendicularly from the upper edge of said side plate member.
6. Traveling grate for heat treating materials conveyed through a treatment chamber comprising a continuous chain grate; and upstanding, elongate side plate members at the lateral edges of said chain grate and having their adjacent ends in overlapping relation, each of said plate members being alike and having a body provided adjacent its opposite ends with a pair of spaced apart holes therein for the reception of bolts, each of said plate members having therein a pair of spaced apart slots extending from the upper edge of said plate member toward but terminating short of the lower edge thereof, said slots being located between said holes, the locations of said holes and the locations of said slots being such that the overlapping ends of adjacent plate members cover said slots.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7238025 | 1972-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3841829A true US3841829A (en) | 1974-10-15 |
Family
ID=6633329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00393809A Expired - Lifetime US3841829A (en) | 1972-10-17 | 1973-09-04 | Traveling grate for heat treating materials |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3841829A (en) |
| BR (1) | BR7307672D0 (en) |
| NO (1) | NO140417C (en) |
| SE (1) | SE381508B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001071254A1 (en) * | 2000-03-23 | 2001-09-27 | Svedala Industries, Inc. | Extended life traveling grate side plate |
| US9776798B2 (en) * | 2012-10-11 | 2017-10-03 | Kabelschlepp Gmbh—Hünsborn | Assembly set for a slat-band conveyor |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1700366A (en) * | 1928-04-20 | 1929-01-29 | Frank A Fahrenwald | Supporting finger for annealing furnaces |
| US2006612A (en) * | 1934-01-08 | 1935-07-02 | American Manganese Steel Co | Furnace carrier |
| US2045646A (en) * | 1935-06-15 | 1936-06-30 | Henry H Harris | Link belt |
| US2279689A (en) * | 1940-10-14 | 1942-04-14 | American Brake Shoe & Foundry | Multipart carrier blade for endless chain carriers and the like |
| US3322414A (en) * | 1965-03-01 | 1967-05-30 | Abex Corp | Conveyor apparatus |
| US3393904A (en) * | 1965-07-02 | 1968-07-23 | Huntington Heberlein And Compa | Travelling grate sintering apparatus and the like |
| US3420512A (en) * | 1967-06-14 | 1969-01-07 | Reserve Mining Co | Grate bar for traveling grate conveyor |
| US3548763A (en) * | 1967-10-12 | 1970-12-22 | Gutehoffnungshuette Sterkrade | Grate section for a traveling grate |
| US3563520A (en) * | 1968-09-11 | 1971-02-16 | Mueller Fritz | Side plate for use in sinter grates |
-
1973
- 1973-09-04 US US00393809A patent/US3841829A/en not_active Expired - Lifetime
- 1973-09-10 SE SE7312268A patent/SE381508B/en unknown
- 1973-10-03 BR BR7672/73A patent/BR7307672D0/en unknown
- 1973-10-16 NO NO4010/73A patent/NO140417C/en unknown
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1700366A (en) * | 1928-04-20 | 1929-01-29 | Frank A Fahrenwald | Supporting finger for annealing furnaces |
| US2006612A (en) * | 1934-01-08 | 1935-07-02 | American Manganese Steel Co | Furnace carrier |
| US2045646A (en) * | 1935-06-15 | 1936-06-30 | Henry H Harris | Link belt |
| US2279689A (en) * | 1940-10-14 | 1942-04-14 | American Brake Shoe & Foundry | Multipart carrier blade for endless chain carriers and the like |
| US3322414A (en) * | 1965-03-01 | 1967-05-30 | Abex Corp | Conveyor apparatus |
| US3393904A (en) * | 1965-07-02 | 1968-07-23 | Huntington Heberlein And Compa | Travelling grate sintering apparatus and the like |
| US3420512A (en) * | 1967-06-14 | 1969-01-07 | Reserve Mining Co | Grate bar for traveling grate conveyor |
| US3548763A (en) * | 1967-10-12 | 1970-12-22 | Gutehoffnungshuette Sterkrade | Grate section for a traveling grate |
| US3563520A (en) * | 1968-09-11 | 1971-02-16 | Mueller Fritz | Side plate for use in sinter grates |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001071254A1 (en) * | 2000-03-23 | 2001-09-27 | Svedala Industries, Inc. | Extended life traveling grate side plate |
| US6412429B2 (en) | 2000-03-23 | 2002-07-02 | Svedala Industries, Inc. | Extended life traveling grate side plate |
| US9776798B2 (en) * | 2012-10-11 | 2017-10-03 | Kabelschlepp Gmbh—Hünsborn | Assembly set for a slat-band conveyor |
Also Published As
| Publication number | Publication date |
|---|---|
| NO140417B (en) | 1979-05-21 |
| NO140417C (en) | 1979-08-29 |
| SE381508B (en) | 1975-12-08 |
| BR7307672D0 (en) | 1974-08-15 |
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