EP0811818B1 - Grate plate and its fabrication process - Google Patents

Grate plate and its fabrication process Download PDF

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Publication number
EP0811818B1
EP0811818B1 EP19970107556 EP97107556A EP0811818B1 EP 0811818 B1 EP0811818 B1 EP 0811818B1 EP 19970107556 EP19970107556 EP 19970107556 EP 97107556 A EP97107556 A EP 97107556A EP 0811818 B1 EP0811818 B1 EP 0811818B1
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EP
European Patent Office
Prior art keywords
plate
grate
material
characterised
material carrier
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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EP19970107556
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German (de)
French (fr)
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EP0811818A1 (en
EP0811818B2 (en
Inventor
Norbert Bredenhöller
Ludger Dr.-Ing. Brentrup
Otto Dipl-Ing. Heinemann
Hermann Dipl.-Ing. Niemerg
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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Priority to DE1996122636 priority Critical patent/DE19622636A1/en
Priority to DE19622636 priority
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7796262&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0811818(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Publication of EP0811818B2 publication Critical patent/EP0811818B2/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02Cooling
    • F27D15/0206Cooling with means to convey the charge
    • F27D15/0213Cooling with means to convey the charge comprising a cooling grate
    • F27D15/022Cooling with means to convey the charge comprising a cooling grate grate plates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/02Sintering grates or tables
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/496Multiperforated metal article making

Description

The invention relates to a grate plate for installation in a grate device for heat exchange between pourable goods and treatment gas, especially for Mounting on a grate plate support in a grate cooler, according to the preamble of claim 1, and a method for producing a grate plate, according to the preamble of claim 19.

From practice it is generally known to use grate plates of the required type in various grate devices to be installed in which a pourable good, e.g. Cement materials, ore materials and the like, with the help from flowing through the top layer from bottom to top Treated gases in the manner required become. This can be, for example, a Preheating, pre-burning, burning and above all cooling act on the materials mentioned.

In the not yet published German Patent application 195 37 904.7 is a grate plate of the kind proposed by their construction a particularly cheap and even one Flow through the material to be treated and thus an optimal one Heat exchange between product and treatment gas achieved shall be. For this purpose it is proposed the gas passage channels in the crop support plate each to be designed in the manner of a pipe and approximately in a zigzag fashion, whereby they move overall in the direction of material conveyance diagonally from the underside of the plate to the top of the plate should extend.

EP-B-0 167 658 is also a box-shaped one Grate floor element with two lateral supporting webs known, which are vertical and in the longitudinal direction of the plate extend and on which the surface determining and between them fine, over the entire grate element width continuous, gas-slit-forming, strip-shaped bodies are attached in a ladder or tine shape. Each two such ladder or fork-shaped structures lateral support bars and lasts are complementary and put together in a form-fitting manner, that the ledge bodies running parallel to each other Overall, a flat load bearing surface with the one in between Form remaining gas passage slots.

Starting from the known state of the art Technology is said to be a grate plate according to EP-A-0 549 816 or a grate floor element are created in which or replacing individual, worn out ones Parts with little assembly effort and material saving is possible. This should now be achieved in that the grate floor element (grate plate) differently than before (namely according to EP-B-0 167 658) into one of the two side webs interconnecting frames as well as individual, slat body connectable with this frame is divided. This is to account for the circumstance be worn that especially the slat body one are subject to increased wear and are replaced Need to become. Due to the construction proposed here can make individual slat bodies with little installation effort to be replaced without at the same time intact side bars must be replaced. Considered the structure of a Rust floor element, this contains as essential Parts on the one hand the preferably one-piece frame and a large number of one behind the other in the conveying direction arranged individual lamellar bodies, which in the assembled Condition the grate surface. To this Purpose are spaced apart Longitudinal webs of the frame each in the longitudinal direction provided longitudinal guide profiles, while the individual slat bodies on their side Each ends with an associated longitudinal guide profile have interacting counter profile, so that this slat body from the front of the frame forth in the longitudinal guide profiles and thus in the frame can be inserted or replaced individually can. Each slat body essentially consists from a main section forming the grate floor surface and an approach attached to it, which in installed condition one adjacent slat body reaches under. Also are on the front Edges of the main section of each slat body two Spacer projections formed on the trailing edges of each previously inserted into the frame Create lamellar body, so that between two adjacent slat bodies a gas passage slot remains free. To secure the slat body in the frame, becomes a special on the front end of the frame trained lamellar body threaded, the has an end flange protruding downwards, which is welded to the front bulkhead or otherwise Way is firmly connected.

This EP-A-0 549 816 is in column 2, lines 44 to 48 mentions that the proposed division of the Grate floor element, for example, also make it possible the frame on the one hand and the slat body on the other from different, to their respective functions to produce optimally adapted materials; however, no precise details have been given. Information on this can be obtained from the known stand the technology, for example, in the above mentioned EP-B-0 167 658 (of which in the last mentioned European patent application is assumed). There is namely in Column 6, lines 4 to 17, etc. pointed out that the rust floor element there is metallic or can be cast ceramic, where of the lamellar body forming the grate surface Support bars are cast on. In addition, in this context a reference in Walter H. Duda, CEMENT-DATA-BOOK, Vol.1, 3rd edition (1985), p.542 (1st paragraph) called, in the explanation of clinker grate coolers is mentioned that the grate plates accordingly the thermal and mechanical loads in the Material quality are graded. The grate plates of the different cooler zones / rust zones are then removed different types of steel casting or special steel casting manufactured.

In DE-A-37 34 043 is a grate cooler for cooling hot bulk material revealed. Here are box-shaped Grate plate support with flat top cover plates provided, each of which is also of a flat design Grate plate are covered on their front End is angled down. In the cover plate of the Grate plate carrier and in the flat arranged above Grate plates are slit-shaped gas openings provided while lying between these two flat plates as a connection between the above-mentioned gas passage openings Connection openings are formed. Because the gas passage openings in the two superimposed flat plates in the longitudinal direction of each other are to be avoided that solids due to a failure of the cooling gas supply the gas passage openings can fall down, with throttling devices in this opening system can be arranged.

Especially with the two last mentioned grate plate designs it has been shown time and again that with tops that come into contact with the goods are still relative are prone to wear, which is particularly evident if relatively abrasive goods, such as is the case with cement clinker to cool down the grate device or a corresponding cooling grate transported along and cooled with cooling gas shall be.

The invention is therefore based on the object Grate plate according to the preamble of the claim 1 and a method for producing a grate plate according to the preamble of claim 19 further improve that the Guttragplatte itself at extremely abrasive goods, e.g. Cement clinker or Like., a relatively long life (long service life) owns and thereby through a relatively cheap and characterized by inexpensive production.

This task becomes constructive on the one hand through the labeling features (especially in combination with each other) of claim 1 and the other in procedural terms by the characteristic Features of claim 19 solved.

Advantageous refinements and developments of Invention are the subject of the dependent claims.

In the construction of the grate plate according to the invention is the support plate made of highly wear-resistant reworked i.e. subsequently made highly wear-resistant Rolled steel plate material made, and the Gas passage channels are - in the vertical longitudinal section viewed through the support plate - essentially straight and sloping in the conveying direction in this Guttragplatte incorporated.

Highly wear-resistant reworked rolled steel plate material is already from general mechanical engineering known for wear-prone machine parts, without it, however, so far for the formation of Guttragplatten for grate plates of the type mentioned for use has come. This is probably due to the fact that the Guttragplatte such a grate plate - in particular in the treatment of extremely abrasive goods such as Cement clinker or the like - not only high abrasion or Wear attacks, but also a considerable weight load is exposed, so accordingly large sheet thicknesses have been considered necessary are, however, the plate material mentioned relative become expensive.

In the practical on the basis of the invention Internal tests have now shown that this is the case according to the invention used for the production of the support plate, subsequently made highly wear-resistant rolled steel plate material, anyway from a special alloy exists, compared to the previously used partly tempered materials an unexpectedly clear Extended service life brings with it, so essential is more wear-resistant than the previously known and materials used for these support plates. Because of this fact, there is a big advantage that in the grate plate according to the invention, the crop support plate made from relatively thin sheet material can be and still have a longer life than the known designs can have. Advantageous is also that for the production of this Guttragplatte commercially available plate material, namely the highly wear-resistant reworked rolled steel plate material can be used.

In the case of the product support plate thus produced, it also becomes regarded as particularly advantageous if - as for Part already mentioned above - the gas passage channels essentially straight and oblique in Direction of conveyance incorporated into this support plate are. The latter can be done in a relatively simple manner but very precise and the respective requirements done appropriately, especially through a special high-energy cut process, such as it will be explained in more detail later. The training and Alignment of the gas passage channels ensures a good penetration of what is on the support plate Good of the gas to be supplied (e.g. cooling air with a cooling grate), with a certain support for that on the associated Grating device to be transported along well achieved can be.

Since the Guttragplatte in this grate plate according to the invention - As explained before - from relatively thin plate material can be produced, it is appropriate to ensure their stabilization so that none disturbing vibrations during the operation of the associated Grate device, e.g. grate cooler. For this reason it is initially provided that the Plate body within its outer frame structure a parallel frame side panels firmly together has a connecting support structure made of stiffening elements, on which the Guttragplatte in places between supported the gas passage channels and at least is partially attached. This scaffold connects thus parallel frame side parts, especially the Long side parts firmly and therefore sufficiently stable with each other, with the bottom of the support plate additionally on the stiffening elements of this support frame supported and in places between the Gas passage channels at least partially attached becomes. This also ensures at the same time that the treatment gas or cooling gas on its way from the underside of the plate to the top of the plate (into the Treating goods) not at all or not significantly impaired becomes.

It is further in the context mentioned above expedient that the stiffening elements of the scaffolding at least in part in the form of with parallel Distances to each other, in the transverse direction of the plate between the long sides of the outer Frame structure extending support ribs with a flat channel cross-section open at the top are, the one channel longitudinal edge of each support rib directed against the underside of the support plate and is connected to this underside of the plate during the other rib longitudinal edge with the formation of a gas passage gap with a parallel distance to the underside of the plate runs, and that the gas passage channels in the Guttragplatte itself slit-shaped and approximately parallel to extend the support ribs, being on the underside of the plate each over the channel cross-section of the one below Open out support ribs.

With regard to the process of producing a such grate plate results from what was said already that according to the invention for the grate plate highly wear-resistant reworked or a retrofit highly wear-resistant rolled steel plate material is used and the gas passage channels through a special high-energy cut process slit-shaped in the transverse direction of the plate in the Guttragplatte be incorporated. The Guttragplatte can thus be made from relatively inexpensive and accurate become.

In the manufacture of the grate plate according to the invention it is in the sense of a relatively cheap and inexpensive Manufacture especially for the Guttragplatte as well as for one well distributed and unhindered passage of the treatment gases also important that the gas passage channels as economically and precisely as possible Guttragplatte can be incorporated. In advantageous This is done by the high-energy cut process mentioned above.

As a rolled steel plate material can be commercially available Composite steel plates are used, the top one Post-hardened or highly wear-resistant layer is formed by a hard build-up welding layer and a hardness of about 58 to 68 HRC (according to Rockwell) owns. This rolled steel plate material stands out with a particularly high level of stability.

As a high-energy separating process for incorporation the gas passage channels in the Guttragplatte can expediently a plasma burning process, a laser burning process, a high pressure water jet abrasive cutting process or some other similar high energy Separation cutting methods are used. In each Trap can by such - known - separation cutting processes be ensured that even after the fact highly wear-resistant (e.g. post-hardened or provided with hard overlay welding layer) Rolled steel plate materials extremely reliable, accurate and economical with the necessary gas passage channels are provided can.

As for the formation and arrangement of the gas passages As far as the load bearing plate is concerned, there is but several execution options. So it will be for the treatment of the goods is generally advantageous, if the gas passage channels - in vertical longitudinal section through the grate plate and thus through the crop support plate considered - essentially straight forward and running obliquely in the material conveying direction into the material support plate be incorporated, being one of the Plate underside to the plate top essentially constant or essentially uniform can get narrowing slot width. This can not just the heat exchange between good and gas, but also a certain support effect for that on the associated grate device favored become.

Furthermore, it can be advantageous in the longitudinal direction of the plate several parallel transverse rows with gas passage channels - at least in the direction of good conveyance in a front longitudinal section of the support plate and several in each transverse row Incorporate large or equally long gas passage channels. In contrast, it can be used in other execution cases However, it can also be an advantage (e.g. in Simplified manufacturing) if the Gas passage channels - viewed in the direction of material flow - At least in the front longitudinal section of the good plate incorporated and several transverse, each slit-shaped essentially continuously extending between outer frame side parts Gas passage channels in the longitudinal direction of the plate with the same Distances can be arranged one behind the other.

In this production of the grate plate according to the invention it is also considered particularly useful if inside the outer frame structure of the base plate body a support structure made of stiffening elements is on which the Guttragplatte in places supported and at least partially attached, the are located between gas passages. This The measure proves to be particularly advantageous in that than thereby the highly wear-resistant reworked Rolled steel plate material can be relatively thin. The support plate can thus - as already mentioned above indicated - optimal without obstructing the gas flow supported and made of relatively inexpensive, commercially available Rolled steel plate material can be made without that the risk of building up unwanted vibrations in the support plate or undesirable bending stresses can occur in it.

The invention is explained in more detail below with reference to the drawing. Show in this drawing

Fig. 1
a vertical longitudinal section through a grate plate manufactured according to the invention and fastened to a grate plate support;
Fig. 2
a plan view of the grate plate of FIG. 1;
Fig. 3 and 4
Exploded views of two different grate plate designs, each with a vertical longitudinal section through the grate plate;
Fig. 5
a vertical longitudinal sectional view through the plate body, according to the line VV in Figure 6;
Fig. 6
a top view of the plate base body according to Figure 5;
Fig. 7 and 8
a vertical longitudinal sectional view and a top view of the grate plate of some variants.

In the illustrated and described below Embodiments are assumed that the grate plate according to the invention for installation in a grate cooler, preferably moving grate cooler, for cooling extremely abrasive hot goods executed and determined is. At this point, however, it should also be mentioned that the grate plate according to the invention with equally good success installed in other roughly similar grate devices can be in which pourable goods are a heat exchange with treatment gas, for example preheating or burning the respective goods should. A particularly preferred use of this invention However, the aforementioned installation is a rust plate in a grate cooler for extremely hard-wearing Goods, as is especially the case with cement clinker is. Since rust cooler of the type in question here, how e.g. Moving grate cooler or the like, are generally known, needs to build such a grate cooler here not to be discussed in more detail.

The general structure of the grate plate 1 according to the invention as well as their installation or their attachment on one Grate plate carrier 2 in an associated grate cooler first explained with reference to FIGS. 1 and 2. To do this still generally stated that - as known per se - Several grate plate carrier 2 in the longitudinal direction the grate cooler or the built-in cooling grate are arranged one behind the other in a corresponding manner, these grate plate carrier 2 transversely or at right angles to the longitudinal direction of the cooler and thus also to the direction of delivery (Arrow 3) of the goods to be cooled are. There is one on each grate plate carrier 2 Cross row of several grate plates 1 - perpendicular to Drawing plane of Fig.1 - arranged, the in the conveying direction adjacent rows of grate plates overlap like a scale.

The grate plate 1 contains a plate base body as main components 4 with an outer frame structure 5 as well one on the upper edge 5a of this frame structure 5-preferred through welds - fastened crop support plate 6, designed as a flat plate is. In this support plate is a variety of essentially of the same size and of the same design Gas passage channels 7 formed, the continuous from the underside of the plate 6a to the top of the plate 6b of this support plate 6 are provided.

The grate plate carrier 2 is designed as a hollow body and serves in addition to the arrangement and attachment of the grate plates 1 also the supply of cooling gas or of cooling air, as shown in Fig. 1 by dashed lines Arrows 8 is indicated, so that this cooling gas (Arrow 8) from below into the hollow box-like Grate plate 1 introduced and then through the gas passage channels 7 evenly distributed in that on the Enter the refrigerated goods located on the top of the product support plate 6 can. At the same time, there is also a good one Cool down the grate plate itself.

For quick, reliable and detachable attachment the grate plate 1 on the grate plate support 2 provides a Clamping screw 9, which with its head part 9a in a Plate base 4 trained attachment approach 10 engages and with their opposite, outer end 9b through a longitudinal wall 2a of the grate plate carrier 2 2 reaches out and there with Is tightened with the help of a screw nut 11. In Fig.1 can also be seen that the in the direction of good (Arrow 3) facing front part of the grate plate 1 is bounded below by a base plate 12, the one rear connecting edge 12a for positive Connection with the longitudinal edge 2b facing it has hollow grate plate support 2.

For the construction of this grate plate according to the invention 1 it is now important that the Guttragplatte 6th Made of highly wear-resistant reworked rolled steel plate material is manufactured, i.e. one from the start Rolled steel plate material already made from a special alloy subsequently becomes highly wear-resistant made, e.g. post-hardened or with a hard overlay weld layer Mistake. Such rolled steel plate material is commercially available but will so far only for special machine parts in general Mechanical engineering, but not for rust devices Treatment of abrasive goods used.

Because of the extremely high wear resistance of the previous described rolled steel plate material, namely even with extremely hard-wearing cement clinker for the production of the Guttragplatten this rolled steel plate material with a relatively small plate thickness be used. Because of this also for cooling of cement clinker only a relatively small panel thickness is this, in itself, quite expensive made highly wear-resistant Rolled steel plate material also for use especially with grate plates 1 in a grate cooler got interesting.

These relatively thin plates for use as Guttragplatte 6, however, harbor the risk of a strong Bending stress on the part of the person Good weight and the build-up of unwanted vibrations during cooling operation in itself. To these dangers prevent, it will be in this invention Grate plate 1 also considered appropriate, that the plate body 4 within its outer Frame structure 5 a parallel frame side parts, i.e. at least its long side walls or long side parts 5b and 5c support frame firmly connected 13 made of stiffening elements, namely support ribs 14 and stiffening webs 15, on which the support plate 6 at locations between the gas passage channels 7 supported and at least partially attached, preferably welded. How from the explanations for Figures 5 and 6 (Slab base body) will result in more detail, is in this way the support structure 13 with an approximately honeycomb structure (with rectangular honeycomb), whereby the crop support plate 6 is extremely grid-like reliable, i.e. deflection and vibration free is supported and fastened on this support frame 13.

The further structure of the grate plate 1 according to the invention will now be explained in more detail with reference to FIGS. 3 and 4, where the exemplary embodiments there all only through the training or production of Distinguish good support plate 6 or 6 'during the Plate base 4 similar in both examples can be built.

As has already been mentioned, the support structure is in place 13 essentially from the total approximately honeycomb composite support ribs 14 and stiffening webs 15. Here are the support ribs 14 - like also shows Fig.6 - with parallel distances to each other arranged, in the transverse direction of the plate, i.e. perpendicular to the direction of material conveyance (arrow 3 in Fig. 1) between the long side walls or long side parts 5b and 5c of the outer frame structure 5 extend and are firmly connected to them. As the Recognize sectional views in Figures 1, 3, 4 and 5 leave, these support ribs 14 expediently one flat channel cross section open at the top, whereby one channel longitudinal edge (14a) of each support rib 14 the underside of the plate 6a and the other longitudinal edge of the gutter (14b) is at a distance from the underside of the plate 6a. For this training points in these first embodiments (Fig.1 to 6) each support rib 14 two Rib legs 14a extending in the transverse direction of the plate and 14b at the same time with their outer edges form the gutter edges and one of which is shorter Rib legs 14a each against the bottom 6a of the Guttragplatte 6 or 6 'directed and with this plate underside 6a is firmly connected, for example through short welds or welds, while the other, longer rib leg 14b under training a gas passage gap 16 (see FIG. 1) with a parallel one Distance to the underside of the plate 6a.

According to these first exemplary embodiments, it is preferred that the gutter cross section mentioned everyone Support rib 14- as shown in Figs. 1, 3, 4 and 5 - approximately in the form of an isosceles angle is formed, the in the material conveying direction (Arrow 3) pointing shorter rib legs 14a firmly the lower side 6a is connected, the longer one Rib legs 14b including one - as in the figures shown - flat acute angle - in Material conveying direction (arrow 3) - against the underside of the plate 6a rises obliquely backwards and wherein both rib legs 14a and 14b over an arc curved apex section 14c directly into one another are temporarily connected to each other.

Especially in the vertical longitudinal sectional views (e.g. Fig. 1, 3, 4) through the grate plate 1 can be easily recognize that the gas passage channels 7 generally from the plate underside 6a to the plate top 6b essentially straight and oblique to the direction of material conveyance (Arrow 3) ascending into the support plate 6, 6 'are incorporated.

The gas passage channels 7 extend in the support plate 6, 6 'slit-shaped and approximately parallel to the Support ribs 14 (each perpendicular to the drawing planes 1, 3, 4 and 5)). The gas passage channels 7 open in these first exemplary embodiments on the underside of the plate 6a in each case - cf. in particular Fig.1 - above the channel cross-section, preferably in the middle area of this channel cross-section, the underlying support ribs 14, whereby these support ribs 14 are simultaneously a type of gas or Air control elements (as an extension or continuation of the Form gas passage channels 7).

With a view to a particularly effective and even loading of the goods to be cooled with Cooling gas or cooling air is considered advantageous if if - according to a first embodiment - crosswise to the material conveying direction (arrow 3) several essentially equally large, slot-shaped gas passage channels 7 each in a transverse row and several such transverse rows in the longitudinal direction of the slab (parallel to the material conveying direction, Arrow 3) with equal intervals in a row and - viewed in the direction of good conveyance (arrow 3) - at least in the front longitudinal section of the crop support plate 6 and 6 'are arranged, as in the supervision can be seen on the grate plate 1 according to FIG. The gas passage channels 7 in adjacent one another Cross rows are offset from one another or arranged on a gap.

For a good treatment function of the to be cooled Good things are also considered advantageous that the Support ribs 14 with their relatively flat channel cross sections Extensions on the underside of the overlying ones Form gas passage channels 7 in a manner that according to the arrows 8 indicated in FIG (for the cooling gas) each gas passage 7 - in the vertical Longitudinal section through the grate plate 1 viewed - Overall an approximately zigzag and essentially from the underside of the plate 6a to the top of the plate 6b has an oblique channel shape. On the one hand, this channel shape allows a very effective one Passage of the cooling gas in the on the support plate 6 refrigerated goods and, on the other hand, enables that possibly through the gas passage channels 7 after finest particles in the bottom open cross-section of the support ribs 14 caught and blown back towards the top of the plate can be. There is also a good cooling effect on the grate plate itself.

As already expressed several times above has been used in the production of the support plate 6 or 6 'made of a highly wear-resistant rolled steel plate material an important feature of this invention Grate plate 1 seen. Particularly inexpensive is it the Guttragplatte 6, 6 'from one commercially available, highly wear-resistant due to subsequent hardening made of rolled steel plate material, with at least one top layer in particular post-hardened or wear-resistant Hard build-up welding layer is formed and a hardness - according to Rockwell - from about 58 to 68 HRC.

In the sense of the above it is assumed that the Guttragplatte 6 in the example of Figure 3 from the the same material, namely a commercially available Hardboard or a later highly wear-resistant made, e.g. post-cured, specially alloyed rolled steel plate material.

In the exemplary embodiment according to FIG. 4, on the other hand, it is assumed that that the support plate 6 'at least two immediately one on top of the other, the same throughout Has layers 6.1 or 6.2 having layer thickness. The lower plate layer 6.1 can consist of one there are specially alloyed rolled steel plate materials, and on this lower plate layer 6.1 is the upper one Plate layer 6.2 as particularly highly wear-resistant Material layer by hard overlay welding - in a suitable Thickness and with the stated hardness - applied.

When using this relatively hard rolled steel plate material for the production of the support plate 6 or 6 'it is now important to find a suitable method for incorporating the slit-shaped gas passage channels 7 to be provided. It is therefore suggested the gas passage channels 7 by a special separation cutting process to be incorporated into the support plates 6 and 6 ', which is particularly beneficial with the help of one known plasma burning process very clean and can happen exactly. This incorporation of the gas passage channels can, however, also be used with a suitable laser burning method or with the help of another similar high-energy combustion process or with Using a high pressure water jet abrasive cutting process (with a relatively fine, with very high pressure water jet suitable fine abrasives, e.g. Corundum or the like, added) are carried out; with all of these Separation process can be the one to be worked out Focus the material point very precisely. It can do this comparatively fine or narrow gas passage channels 7 relatively dimensionally accurate in the required manner be worked into the support plate 6 or 6 ', for example with a clear slot width W (Fig. 3 and 4) of about 2.5 to 3 mm. It is in these first exemplary embodiments (see FIGS. 1 to 4) one from the bottom of the plate 6a to the top of the plate 6b constant slot width W provided.

When incorporating these gas passage channels 7 in the Good support plate 6 or 6 'is then further proceeded that in the longitudinal direction of the plate (in the direction of arrow 3) several parallel transverse rows with these gas passage channels 7 - viewed in the direction of good conveyance (arrow 3) - At least in a front longitudinal section the support plate 6, 6 '(as can be seen in the drawing is) and several are the same in each of these transverse rows large or long gas passage channels 7 by a suitable one High energy cut process (as above mentioned) can be incorporated, as can be seen in Fig.2 is. Each transverse row receives the desired one Number of gas passage channels 7. In the sense of a distribution of the Treatment gas in the top layer it will also for viewed appropriately, approximately according to the representation 2, the gas passage channels 7 in the adjacent, transverse rows of channels each Gap staggered.

Below is a little closer to the constructive Execution of the plate base body 4 and in particular discussed the design of the support structure 13, initially referring in particular to FIGS. 5 and 6 is taken, in which only the plate body 4 in vertical longitudinal section and illustrated in plan is. Shape and course of the channel-shaped support ribs 14 can initially correspond to what already exists described above in particular with reference to FIGS. 3 and 4 has been. In the channel-shaped support ribs 14 are now - over the length of each support rib 14 evenly distributed - several upright and in Longitudinal plate direction (i.e. in the direction of material conveyance Arrow 3) extending stiffening webs 15 firmly attached. These stiffening webs 15 are not only in Transverse direction of plate provided evenly distributed, but they also go over the gutter cross section of the associated support rib 14 and connect each two mutually adjacent support ribs 14 firmly together, being from the gutter cross section to the bottom 6a of the support plate 6 or 6 'are sufficient. On in this way the scaffold 13- is special 6 shows - approximately honeycomb-shaped with rectangular honeycombs, the stiffening webs 15 the Guttragplatte 6 and 6 'at positions between each other in the transverse direction of the plate adjacent gas passage channels 7 support and at least partially, e.g. roughly grid-shaped, firmly connected to the underside of the plate 6a, are preferably welded.

Since the gas passage channels 7 according to the examples of Fig. 1 to 4 - as explained above - in adjacent to each other Transverse rows each offset from one another are, in adaptation to this, the support structure 13 trained accordingly, i.e. the rectangular honeycomb honeycomb structure are also gap to each other staggered, with in rows Rectangular honeycombs offset against each other from firmly connected support ribs 14 and stiffening webs 15.

The plate body 4 is now useful with his Frame structure 5, the support structure 13 formed therein and the attachment projection 10 as a one-piece cast body, preferably made of cast steel, thus the support frame 13 from the support ribs 14 and the stiffening webs 15 with the frame structure 5 in cast in one piece. This also contributes to one inexpensive manufacture of the grate plate 1. If the attachment projection 10 - as shown in Fig. 6 - places - on at least one in the area of the longitudinal center the grate plate 1 or the plate base body 4 between the end face parts (or walls) 5d, 5e extending stiffening rib is formed, then the latter also ensures additional stability of the Base plate body 4.

Looking again at the vertical longitudinal sectional views in Fig.1, 3 and 4, then you can see there further that the - viewed in the direction of good conveyance (arrow 3) - Front end part 5e of the frame structure 5 (base plate body 4) a lower wear edge 18, with which the front end of this Rust plate on the top of the - in the drawing not illustrated - next grate plate can slide along if it is a moving grate cooler acts. For this reason, it is then advisable this lower wear edge 18 of the same manufacture highly wear-resistant rolled steel plate material like the support plate 6 or 6 '. This wear edge 18 is then in a corresponding lower Recess of the front end part 5a tight, however interchangeably attached if necessary.

As already mentioned above at the beginning of the execution description has been mentioned, is in the direction of material conveyance (Arrow 3) facing front part of the grate plate 1 bounded below by the base plate 12. This bottom plate 12 is far enough below the Support frame 13 arranged so that a sufficient large space for the supply and distribution of treatment gas from below into the area of the gas passage channels 7 is guaranteed. This bottom plate 12 can also be made in one piece with the plate base body 4 be poured. It can ensure adequate accessibility the grate plate 1 from below, however, additionally still be an advantage if in this bottom plate 12 a sufficiently large opening 19 is provided is that by a separate, removable if necessary Cap 20 is completed (see. also Fig. 4 and 6).

7 and 8 are some below Variants of the examples described above described, with the same or similar parts the first embodiments (Fig.1 to 6) and this other versions (Fig. 7 and 8) with the same reference numerals, possibly with the addition of a Double dashes are called, so that their repeated Explanation is largely unnecessary.

In the variant of the grate plate 1 '' according to Fig.7 should first be noted that in the essentially of the same type of highly wear-resistant Rolled steel plate material as in the first embodiments manufactured support plate 6 '' Gas passage channels 7 '' generally in the same distribution and arrangement can be incorporated as before is described with reference to Figures 1 to 4 and below will be explained with reference to FIG. 8. The gas passage channels 7 '' in the support plate 6 '' according to Fig. 7 differ from those of the previous examples (see Fig. 1, 3 and 4) essentially only because that they - in the vertical longitudinal section through the Guttragplatte 6 '' considered - with a different from the Plate bottom 6''a to plate top 6''b essentially uniformly narrowing lights Slot width W '' are executed. These slit-shaped too Gas passage channels 7 '' can be very precisely and relatively easy with the help of the one already explained above Manufacture high-energy cut process. As in the longitudinal sectional view according to FIG is recognizable, results from this upwards and narrow slot width at the front, so to speak a kind of nozzle shape, which makes it special when needed on the goods located on the support plate 6 '' can be influenced.

A further embodiment variant is illustrated in FIG. which relate to the cross-sectional shape of the Support ribs 14 '', which in their arrangement and Distribution under the 6 '' support plate and in the base plate 4 or in its outer frame structure 5 exactly match what is shown above 1 to 6, in particular with reference to FIGS. 5 and 6, has been explained so that it is expressly referred to can be. While with reference to Fig.1, 3, and 5 the stiffening ribs 14 the cross-sectional shape of have unequal legs, has in the Design variant according to FIG. 7 each support rib 14 '' an approximately flat-arched, bent downward Channel cross section. It is by far above everyone this channel cross-sections and parallel to the associated one Support rib 14 '' each running a bead-like Constriction element 21 is provided, which is approximately the shape of a Can have semicircular strips (as shown in FIG. 7) and thereby from the underside 6''a of the support plate 6 '' against the channel cross section downwards protrudes that it together with the associated Support rib 14 '' forms a lower channel section 7''a in the lower end of the associated gas passage 7 '' empties. The kind of Semicircular constriction elements 21 can as separate parts, for example on the underside of the plate 6''a attached or also in one piece with the plate base body 4 be made.

Otherwise are also in this variant (Fig. 7) in the channel-shaped support ribs 14 '' in turn - As explained in more detail with reference to Figures 5 and 6 - several neighboring supporting ribs firmly connecting reaching 6 '' to the underside of the support plate upright stiffening webs running in the longitudinal direction of the panel 15 so firmly attached that again a honeycomb structure with staggered Rectangular honeycomb made of support ribs 14 '' and stiffening bars 15 is formed.

With respect to the downward curved cross-sectional shape the support ribs 14 '' according to FIG. 7 should be added that - as can be seen in the drawing - here too a channel longitudinal edge of each support rib 14 '' against the Underside 6''a of the support plate 6 '' directed and thus is connected, while the other longitudinal edge of the gutter forming a gas passage gap 16 with parallel distance to the underside of the plate 6''a.

Furthermore, while in the first embodiments, as explained in particular with reference to FIGS. 1 and 2 has been, several across the material conveying direction (arrow 3) essentially the same size, slot-shaped gas passage channels 7 each formed a transverse row are, according to the variant in Fig. 8 suggested that - in the direction of material conveyance (arrow 3) considered - at least in the front longitudinal section the Guttragplatte 6 '' several essentially the same large, slit-shaped gas passage channels 7 '' are provided are in this case continuous transversely to the direction of material conveyance (arrow 3) between the two Frame side parts 5b and 5c extend and in Longitudinal plate direction (corresponding to the direction of material conveyance, Arrow 3) with equal intervals in a row as well are arranged parallel to each other. This means that 8 in the transverse direction the support plate 6 '' only one continuous Gas passage channel 7 '' is present .. That under this Guttragplatte 6 '' support structure 13 can either be made exactly the same as it is based on 5 and 6 with the support ribs 14 and Stiffening webs 15 or as it is based on the variant 7 with the support ribs 14 '' and the stiffening webs 15 have been explained in detail is. In this variant, the support Support ribs 14 or 14 '' and the stiffening webs 15 again the underside 6 ″ a of the support plate 6 ″, only the support ribs 14 and 14 '' then between two transverse gas passage channels 7 '' are arranged.

Claims (26)

  1. Grate plate for incorporation in a grate apparatus for heat exchange between chargeable material and treatment gas, in particular for fixing on a grate plate carrier (2) in a grate cooler, comprising
    a) a base member (4) of the plate having an external frame structure (5) and
    b) a material carrier plate (6, 6', 6''), which is fixed on the upper edge (5a) of that frame structure and on which gas ducts (7, 7'') are formed and pass from the bottom of the plate (6a, 6''a) to the top of the plate (6b, 6''b),
    characterised in that the material carrier plate (6, 6', 6'') is produced from rolled steel plate material, which is remachined in a highly wear-resistant manner, and the gas ducts (7, 7'') - viewed as a vertical longitudinal section through the material carrier plate - are incorporated into the material carrier plate and extend substantially rectilinearly and obliquely in the transport direction (3).
  2. Grate plate according to claim 1, characterised in that the base member (4) of the plate has, within the external frame structure (5) thereof, a supporting frame (13) which connects parallel side elements (5b, 5c) of the frame securely to each other and which is composed of reinforcement elements (14, 14'', 15), on which the material carrier plate (6, 6', 6") is supported and at least partially fixed, and furthermore in that the reinforcement elements of the supporting frame (13) are at least partially in the form of support ribs (14, 14''), which are arranged with parallel spacing from each other and which extend in the transverse direction relative to the plate between the longitudinal side elements (5b, 5c) of the external frame structure (5) and which have an upwardly open, flat channel cross-section, wherein one longitudinal edge of the channel (14a) of each support rib (14, 14'') is directed towards the bottom (6a, 6''a) of the material carrier plate (6, 6', 6'') and is connected to the bottom of that plate, whereas the other longitudinal edge of the channel (14b) extends with parallel spacing relative to the bottom of the plate and forms a passage (16) for the gas, and in that the gas ducts (7, 7'') in the material carrier plate extend in a slot-like manner approximately parallel with the support ribs (14, 14''), the gas ducts (7, 7'') opening out at the bottom of the plate above the channel cross-section of the support rib located below.
  3. Grate plate according to claim 2, characterised in that the support ribs (14, 14'') form, with their relatively flat channel cross-sections, lower extensions of the gas ducts (7, 7'') located above in such a manner that each gas duct-viewed as a vertical longitudinal section through the grate plate (1, 1'') - has overall a duct shape which is approximately zig-zag-like and which, substantially, is at the same time inclined overall.
  4. Grate plate according to claim 2, characterised in that, transversely to the transport direction of the material (3), a plurality of slot-shaped gas ducts (7), which are substantially of the same size, are arranged in a transverse row, and several such transverse rows are arranged with identical spacing behind each other in the longitudinal direction of the plate - viewed in the transport direction of the material - at least in the front longitudinal portion of the material carrier plate (6, 6').
  5. Grate plate according to claim 4, characterised in that several upright reinforcement webs (15), which connect adjacent support ribs securely to each other and which extend as far as the bottom (6a) of the material carrier plate (6, 6') and which extend in the longitudinal direction of the plate, are securely fitted, distributed in the transverse direction relative to the plate, in the channel-shaped support ribs (14) in such a manner that the supporting frame (13) is approximately in the form of a honeycomb and those reinforcement webs (15) support the material carrier plate at points between gas ducts (7), which are adjacent to each other in the transverse direction relative to the plate, and are securely connected, preferably welded, to the bottom of the plate (6a) at least in parts.
  6. Grate plate according to claim 5, characterised in that the gas ducts (7) in the transversely extending rows of ducts, which are adjacent to each other, are offset relative to each other in a staggered manner and, in a matching manner, the supporting frame (13) has a honeycomb structure having rectangular honeycombs, which are offset in transverse rows relative to each other, composed of support ribs (14), which are securely connected to each other, and reinforcement webs (15).
  7. Grate plate according to claim 2, characterised in that - viewed in the transport direction of the material (3)-there are provided, at least in the front longitudinal portion of the material carrier plate (6''), several slot-shaped gas ducts (7''), which are substantially of the same size and which extend continuously transversely relative to the transport direction of the material (3) between the two side elements (5b, 5c) of the frame and which are arranged parallel with each other and behind each other in the longitudinal direction of the plate with identical spacing.
  8. Grate plate according to claim 7, characterised in that several upright reinforcement webs (15), which connect adjacent support ribs securely to each other and which extend as far as the bottom (6''a) of the material carrier plate (6'') and which extend in the longitudinal direction of the plate, are securely fitted, distributed in the transverse direction relative to the plate, in the channel-shaped support ribs (14'') in such a manner that the supporting frame (13) is approximately in the form of a honeycomb, that honeycomb structure preferably having rectangular honeycombs, which are offset relative to each other in adjacent transverse rows, composed of reinforcement webs (15) and support ribs (14'') which are securely connected to each other.
  9. Grate plate according to claim 2, characterised in that the channel cross-section of each support rib (14) is approximately in the form of an unequal angle, the shorter lateral side of the rib (14a), which is directed in the transport direction of the material (3), being connected to the bottom of the plate (6a), the longer lateral side of the rib (14b) rising, directed obliquely backwards, towards the bottom of the plate (6a) and enclosing a relatively flat acute angle - viewed in the transport direction of the material (3) - and both lateral sides of the rib (14a, 14b) being connected directly to each other via a crown portion (14c) which is bent into a curve.
  10. Grate plate according to claim 2, characterised in that each support rib (14'') has a channel cross-section, which is curved downwards approximately in the form of a shallow arc, and in that a respective bead-like narrowing element (21), extending with spacing above each channel cross-section and parallel with the support rib (14''), projects downwards from the bottom (6"a) of the material carrier plate (6'') relative to that channel cross-section in such a manner that the respective narrowing element (21) forms, together with the associated support rib (14''), a lower duct portion (7''a).
  11. Grate plate according to claim 2, characterised in that the base member (4) of the plate is produced, preferably from cast steel, as an integral cast element with the frame structure (5) thereof, the supporting frame (13) formed therein and a projection (10) for fixing on a grate plate carrier (2).
  12. Grate plate according to claim 11, characterised in that the front portion, directed in the transport direction of the material (3), of the grate plate (1) is delimited at the bottom by a base plate (12) which is arranged with spacing below the supporting frame (13) and which has a rear connection edge (12a) for positive connection to a grate plate carrier (2) and preferably a separate closure cover (20).
  13. Grate plate according to claim 1, characterised in that the gas ducts (7) - viewed as a vertical longitudinal section through the material carrier plate (6, 6'') - have a clear slot width (W) which remains constant from the bottom of the plate (6a) to the top of the plate (6b).
  14. Grate plate according to claim 1, characterised in that the gas ducts (7'') - viewed as a vertical longitudinal section through the material carrier plate (6'') - are produced with a clear slot width (W'') which narrows in a substantially uniform manner from the bottom of the plate (6"a) to the top of the plate (6"b).
  15. Grate plate according to claim 1, characterised in that the material carrier plate (6, 6') is produced from a conventional composite plate material, in which at least the top layer, which comes into contact with treatment material, is remachined in a highly wear-resistant manner.
  16. Grate plate according to claim 15, characterised in that the top layer (6.2) of the composite plate material is formed by a hard-facing weld coating.
  17. Grate plate according to claim 1, characterised in that the material carrier plate (6, 6') is produced from a conventional rolled steel plate material which is made highly wear-resistant by subsequent hardening.
  18. Grate plate according to claim 1, characterised in that - viewed in the transport direction of the material (3)-the front end face portion (5e) of the frame structure (5) has a lower abrasion edge (18) of highly wear-resistant rolled steel plate material of the same type.
  19. Method for manufacturing a grate plate for incorporation in a grate apparatus for heat exchange between a chargeable material and treatment gas, in particular for incorporation in a grate cooler, gas ducts being formed in a material carrier plate and extending from the bottom thereof to the top thereof and the material carrier plate being fixed on the upper edge of an external frame structure of a base member of the plate, characterised in that
    a) a rolled steel plate material, which is remachined in a highly wear-resistant manner, is used for the material carrier plate and
    b) the gas ducts are incorporated into the material carrier plate, extending in the form of slots in the transverse direction of the plate, by a high-energy separating cut process.
  20. Method according to claim 19, characterised in that conventional highly wear-resistant composite steel plates are used as the rolled steel plate material, wherein at least a top layer is hardened in a particularly wear-resistant manner or is formed by a hard-facing weld coating and has a hardness of from 58 to 68 HRC (Rockwell hardness).
  21. Method according to claim 19, characterised in that a plasma combustion method, a laser combustion method, a high-energy water-jet abrasive cutting method or another similar high-energy separating cut method is used as the high-energy separating cut method for incorporating the gas ducts into the material carrier plate.
  22. Method according to claim 19, characterised in that the gas ducts - viewed as a vertical longitudinal section through the grate plate - are incorporated into the material carrier plate extending substantially rectilinearly and obliquely in the transport direction of the material, the gas ducts receiving a slot width which, from the bottom of the plate to the top of the plate, remains substantially constant or narrows substantially uniformly.
  23. Method according to claim 19, characterised in that, in the longitudinal direction of the plate, several parallel transverse rows having gas ducts - viewed in the transport direction of the material - are incorporated at least into a front longitudinal portion of the material carrier plate and several gas ducts of identical size are incorporated in each transverse row.
  24. Method according to claim 19, characterised in that the gas ducts - viewed in the transport direction of the material - are incorporated at least into the front longitudinal portion of the material carrier plate and several gas ducts, which extend transversely and which extend in the form of slots substantially continuously between outer lateral elements of the frame, are arranged behind each other with identical spacing in the longitudinal direction of the plate.
  25. Method according to claim 19, characterised in that, within the external frame structure of the base member of the plate, a supporting frame is formed from reinforcement elements, on which the material carrier plate is supported and at least partially fixed.
  26. Method according to claim 25, characterised in that the base member (4) of the plate with its frame structure (5), the supporting frame (13) and at least one fixing projection (10) is cast integrally as a casting element, preferably of alloyed cast steel, and the supporting frame is formed from reinforcement elements, on the one hand, in the form of support ribs (14) and, on the other hand, in the form of reinforcement webs (15), of which the support ribs, extending in the transverse direction of the plate with parallel spacing from each other, securely connect the two longitudinal side elements (5b, 5c) of the frame structure (5) to each other and are formed with flat channel cross-sections, into which the gas ducts (7) located above open out, whereas the reinforcement webs (15), which extend in the longitudinal direction of the plate, divide the channel-shaped support ribs in the transverse direction of the plate and securely connect support ribs, which are adjacent to each other, to each other in the sense of an approximately honeycombed overall structure of the supporting frame, on which the carrier plate (6, 6') is supported approximately in the manner of a grid and is fixed - preferably by welds.
EP97107556A 1996-06-05 1997-05-07 Grate plate and its fabrication process Expired - Lifetime EP0811818B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1996122636 DE19622636A1 (en) 1996-06-05 1996-06-05 A grate plate and method for manufacturing a grate plate
DE19622636 1996-06-05

Publications (3)

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EP0811818A1 EP0811818A1 (en) 1997-12-10
EP0811818B1 true EP0811818B1 (en) 2001-08-16
EP0811818B2 EP0811818B2 (en) 2007-11-21

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EP97107556A Expired - Lifetime EP0811818B2 (en) 1996-06-05 1997-05-07 Grate plate and its fabrication process

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US (2) US5947719A (en)
EP (1) EP0811818B2 (en)
DE (1) DE19622636A1 (en)
DK (1) DK0811818T4 (en)
ES (1) ES2161395T5 (en)
ZA (1) ZA9704141B (en)

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DE102004040048A1 (en) * 2004-08-18 2006-02-23 Ikn Gmbh Grate plate arrangement for stepped gratings
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CN101405542B (en) * 2006-03-17 2011-06-29 多伊克斯投资有限公司 Liquid-cooled grill comprising wear plates
DE102007019530C5 (en) * 2007-04-25 2018-01-04 Alite Gmbh Method and device for cooling a bulk material layer lying on a conveyor grate
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Also Published As

Publication number Publication date
DK0811818T3 (en) 2001-11-12
US5947719A (en) 1999-09-07
DK0811818T4 (en) 2008-04-14
EP0811818B2 (en) 2007-11-21
US6266883B1 (en) 2001-07-31
EP0811818A1 (en) 1997-12-10
DE19622636A1 (en) 1997-12-11
ES2161395T3 (en) 2001-12-01
ZA9704141B (en) 1997-12-09
ES2161395T5 (en) 2008-03-16

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