DE2831473A1 - HIKING GRID COOLER - Google Patents

Description

Dr.-Ing. Dr. jur. VOLKMAR TETZNER van-Go _g h-str _aß e ₃ 2 8 3 H 7

8000 MUNICH 71 RECHTSANWALT und PATENTANWALT Telephone: (cs °) 70 88 03

Telegrams: "Tetrner patent Munich" Telex: 5 212 282 pjtc d

P 4201

Traveling grate cooler

The invention relates to a traveling grate cooler containing an endlessly circulating one that transports the goods to be cooled Grate chain as well as feeding devices arranged below the upper run of the grate chain a flow of cooling air penetrating the layer of goods to be cooled from bottom to top.

In known traveling grate coolers, the grate surface composed of grate plates is essentially impermeable. The goods to be cooled are placed on the traveling grate in a self-contained layer through the The cooling zone is transported and the cooling air flows through it from bottom to top. With these known designs often occur during operation, undesirable hot spots, since the cooling air is looking for preferred flow channels within the resting layer of goods to be cooled. The good becomes as a result unevenly cooled, and it comes in particular to the appearance of hot coarse material at the cooler outlet.

20th

To avoid this disadvantage of the usual traveling grate cooler, sliding grate coolers have already been used in different versions developed in which the onward transport of the goods by a back and forth

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Moving forward movement of the individual grate plates takes place (see. DE-PS 952 785 and 1 170 307). The main disadvantage of this known grate cooler is the high outlay on equipment and the considerable wear and tear.
5

In order to achieve an even temperature even with a traveling grate cooler To achieve cooling of the entire product and the appearance of hot lumps of product at the end of the cooler avoid, the applicant has already developed a traveling grate cooler in which individual areas the grate surface is temporarily an additional movement superimposed on the continuous movement is issued, so that adjacent grate plates have a different resulting movement speed have (see. DE-PS 23 50 811).

The invention is based on the object, in a further development of the known designs, a wander To create grate cooler, in which the desired equalization of the cooling effect with a machine particularly simple and also favorable construction with regard to the wear that occurs is achieved.

This object is achieved according to the invention in that under the well-permeable upper run the grate chain is a fixedly arranged one intended to receive a stationary layer of goods to be cooled and air-permeable grate is provided.

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In contrast to the previously known traveling grate coolers, the design according to the invention is absent a closed grate surface that is largely impermeable to the goods. The layer of goods to be cooled supports rather, it is located on a grate that is fixedly arranged under the upper run of the moving grate chain, on which there is an essentially stationary and accordingly relatively cold protective layer for refrigerated goods forms. The grate chain of the traveling grate cooler according to the invention pushes with its individual Grate bars continue the lowermost part of the hot layer of goods to be cooled in the direction of transport, with not only the overlying zones of the hot layer of goods to be cooled, but that hot refrigerated goods are also circulated intensively. In this way, the formation of preferred flow channels for the cooling air and the occurrence of hot, Largely uncooled chunks of material at the end of the cooler are definitely avoided.

With the elimination of the usual grate plates, the construction of the invention is simplified Traveling grate cooler considerably. In terms of wear and tear, it is beneficial that none are noteworthy Friction occurs between metal parts moving relative to one another: The grate chain moves with it Distance above the stationary grate, whereby also within the grate chain due to the omission of the grate plates only a greatly reduced wear occurs.

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According to a first variant of the invention is immediate Under the lower run of the grate chain, a fixedly arranged intermediate floor for receiving the fine material falling through the upper run of the grate chain is provided.

Another advantageous variant of the invention provides for that serving as an after-cooling section The lower run of the grate chain also has a stationary and air-permeable design Rust before. This results in a two-level cooler with pre-cooling in the upper run and after-cooling in the lower run.

Further details of the invention are the subject of the subclaims and are described in connection with the description of two exemplary embodiments illustrated in the drawing is explained in more detail.

In the drawing show:

1 shows a section through a first embodiment of the invention;

2 shows a section through a second embodiment, for example.

The traveling grate cooler according to FIG. 1 contains an endlessly revolving grate chain 1, which is designed to be permeable is and for this purpose no grate plates, but spacer tubes 2 arranged at intervals having.

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Under the upper run of the grate chain 1, an air-permeable bar grate 3 is arranged in a stationary manner. Under the lower run of the grate chain 1 there is an intermediate floor 4, which is likewise arranged in a stationary manner.
5

In the area of the end of the cooler, further outlet bar grids 5 and 6 are provided, as well as a coarse material crusher 7. A drag chain 8 is located under the intermediate floor 4.

The space between the upper run and the lower run of the V7ander grate cooler is divided into individual cooling air chambers 9, 10, 11 and 12 divided, which are sealed to the lower run of the grate chain by labyrinth dxchtungen are.

In the illustrated embodiment, the upper run and the lower run of the grate chain are through Support rails 13 or 14 carried. Instead, the grate chain can also be supported by supporting rollers and rails are provided.

A knocker 15 for removing adhering material is provided below the bar grating 3. 25th

The mode of operation of the traveling grate cooler shown in Figure 1 is thus as follows:

The hot chilled goods discharged from the furnace (not shown) arrives at 16 on the upper run of the Grate chain 1 and is moved by the grate chain in the direction of arrow 17 and thereby circulated

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and equalized. It is based on a relatively cold layer of goods to be cooled 18 from, which rests directly on the bar grating 3 and is largely at rest. Cooling air is turned off the chambers 9 to 12 (arrows 19) and flows through the refrigerated goods layer 20 substantially from the bottom up.

Fine material that falls through the bar grating 3 reaches the intermediate floor 4 and is removed from the lower run the grate chain 1 is conveyed to the left and dropped onto the drag chain 8 at 21. The bar grate at the cooler outlet separates fine grain and medium grain; the former falls through to the drag chain 8, the latter is fed to a crusher (not shown). Coarse material reaches the bar grate 6 Coarse material crusher 7.

In the second embodiment shown in Figure 2, the grate chain 1 'is with the circulation the goods serving, U-shaped conveyor bars 22 equipped. In this embodiment is located Furthermore, the already explained bar grating 3 is located not only under the upper run of the grate chain, but also there is also a stationarily arranged and air-permeable under the lower run of the grate chain trained grate 23 is provided.

The gap width of the bar grating 3 arranged under the upper run of the grate chain is expediently adjustable, whereby the gap width increases in the direction of movement of the goods (arrow 17). Through this can be the residence time of the individual grain fractions

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Chosen differently on the upper run and in this way adapted to the cooling requirement: In this way, fine grain and medium grain fall off the upper run earlier than the coarse fraction.

The space between the upper run and the lower run is also in this embodiment in several cooling air chambers 24 to 29 divided, of which the chambers 24, 26 and 28 with higher temperature cooling air and the chambers 25, 27 and 29 are supplied with low-temperature cooling air. From the chambers

24, 26 and 28, the cooling air (arrows 30) flows essentially to the upper run of the grate chain, which with it forms a pre-cooling zone while out of the chambers

25, 27 and 29 the low temperature cooling air through the lower run of the grate chain (arrows 31) flows and then via the outlet zone (arrows 32) to a cooler exhaust air dedusting system or an exhaust air chimney .

In this exemplary embodiment, the upper run of the traveling grate cooler thus forms a pre-cooling zone and the lower run a post-cooling zone. This two-deck cooler is characterized by high cooling capacity by a particularly short length.

The entire refrigerated goods are transported away by a drag chain, on which the goods are partly attached at 33, partly through the column of the bar grate 23 falls.

Medium grain is processed by a crusher 34 and coarse material through the aforementioned coarse material crusher crushed. A bar grate 35 guides the chilled goods, which have been crushed by the coarse material crusher 7, to the lower run

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2S3U73

"9 1 of the grate chain 1 'to.

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Claims (9)

Patent claims: 1. Traveling grate cooler, containing an endlessly rotating, the grate chain transporting the refrigerated goods as well as those arranged below the upper run of the grate chain Devices for supplying a layer of goods to be cooled from bottom to top Cooling air flow, thereby marked that under the well-permeable upper run of the grate chain (1, 1 ') a fixedly arranged one intended to receive a stationary layer of goods to be cooled (18) and air-permeable grate (3) is provided. 2. Traveling grate cooler according to claim 1, characterized in that that immediately below the lower run of the grate chain (1) a stationarily arranged Intermediate floor (4) for receiving the fine material falling through the upper run of the grate chain is provided. That a stationarily arranged and permeable to air formed grate (23) is 3. traveling grate cooler according to claim 1, characterized in that under the lower strand serving as the post-cooling of the grate chain (1 ') is also provided. 4. Traveling grate cooler according to claim 1, characterized in that the grate chain (1 ') with for Circulation of the refrigerated goods serving strips (22) is provided. 909885/0247 ORIGINAL INSPECTED 5. traveling grate cooler according to claim 1, characterized in that the under the grate chain (1, 1 ') fixed grate (3) designed as a bar grate with adjustable gap width is. 6. Traveling grate cooler according to claim 5, characterized in that that the gap width of the under the upper run of the grate chain (1, 1 ') is stationary arranged grate (3) enlarged in the direction of movement of the goods. 7. Traveling grate cooler according to claim 3, characterized in that that the devices for supplying a flow of cooling air have at least two chambers (e.g. 24, 29) of different cooling air temperatures of which the chamber (e.g. 24) with cooling air at a higher temperature at least a pre-cooling zone and the chamber formed by the first area of the grate chain upper run (e.g. 29) with cooling air at a lower temperature, at least one formed by the lower run of the grate chain After-cooling zone supplied. 8. traveling grate cooler according to claim 1, characterized in that means are provided for crushing coarse grains in the end region of the grate chain upper run means (ZB5) for separation of fine, medium and coarse grain and / or facilities (eg7). 90988S / 0247 2C3H73 9. Traveling grate cooler according to claim 1, characterized by a device for mechanical cleaning, preferably designed as a knocker (15) ' the stationary grate (3) of adhering material. 909885/0247