GB1559508A - Method of forming a bed of flowable solid material on a conveyor - Google Patents

Method of forming a bed of flowable solid material on a conveyor Download PDF

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Publication number
GB1559508A
GB1559508A GB36255/76A GB3625576A GB1559508A GB 1559508 A GB1559508 A GB 1559508A GB 36255/76 A GB36255/76 A GB 36255/76A GB 3625576 A GB3625576 A GB 3625576A GB 1559508 A GB1559508 A GB 1559508A
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GB
United Kingdom
Prior art keywords
conveyor
lower edge
outlet structure
heap
notional
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
Application number
GB36255/76A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metallgesellschaft AG filed Critical Metallgesellschaft AG
Publication of GB1559508A publication Critical patent/GB1559508A/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/02—Devices for feeding articles or materials to conveyors
    • B65G47/16—Devices for feeding articles or materials to conveyors for feeding materials in bulk
    • B65G47/18—Arrangements or applications of hoppers or chutes
    • B65G47/19—Arrangements or applications of hoppers or chutes having means for controlling material flow, e.g. to prevent overloading
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Discharge Of Articles From Conveyors (AREA)
  • Pile Receivers (AREA)

Description

(54) METHOD OF FORMING A BED OF FLOWABLE SOLID MATERIAL ON A CONVEYOR (71) We, METALLGESELLSCHAFT AKTTENGESELLSCHAFT, a body corporate organised under the Laws of the Federal Republic of Germany, of 14 Reuterweg, 6 Frankfurt-on-the-Main, German Federal Republic, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement :- This invention relates to a method of forming a bed of flowable solid material on a conveyor.
It is often required, particularly in sintering plants, to feed flowable solids onto moving conveyors so as to form a bed having a predetermined, constant height. In sintering plants, grate-protecting material and the mixture to be sintered must be fed onto the sintering machine at high rates, solids must be fed at high rates onto belt conveyors and metering and weighing belt conveyors, and sinter must be fed at high rates onto the sinter cooler. In each case, the required height of the bed must be kept as constant as possible or adjusted to a new value.
It has been proposed to feed a mixture to be sintered onto a sintering machine belt by means of a drum feeder, which is disposed under the outlet structure of a supply bin and which rotates to discharge solids at a predetermined rate from the supply bin. These solids slide on an inclined plate onto the sintering machine belt and initially form a slope on the belt. The lower edge of the inclined plate acts as a scraper, which controls the desired height of the bed. This practice results in a heavy wear at the discharge opening of the outlet structure and at the inclined plate and in a compaction of the surface of the mixture to be sintered on the sintering machine belt.
It has been proposed to use a vibrating chute for feeding the mixture to be sintered via inclined distributor plates onto the sintering machine belt and to control the height of the bed by a scraper. This practice results also in a heavy wear of the inclined plates and of the scraper and in compaction of the surface of the mixture to be sintered.
It has further been proposed to feed a mixture to be sintered from an outlet of a supply container in a continuous stream onto a sintering machine belt in such a manner that a heap of deposited solids is formed under the outlet structure and is sheared to the desired height of the bed by an adjustable scraper, which is mounted at the forward end of the outlet. That scraper is subject to heavy wear and compacts the surface of the mixture to be sintered.
It is an object of the invention to avoid or reduce the disadvantages of the known methods of feeding and particularly to avoid a compacting of the solids lying on the conveyor.
According to the present invention there is provided a method of forming a bed of flowable solid material on a conveyor, wherein a continuous stream of the material is fed from an outlet structure of a supply container onto a conveyor as the latter moves below the outlet structure, the outlet structure having forward and rear walls (relative to the direction of movement of the conveyor), the rear wall having an inclination to the conveyor in excess of the angle of sliding friction of the material, and wherein the lower edges of said walls are so disposed as to provide a notional heap (as hereinafter defined) of said material on the conveyor, the rear of the base of said notional heap lying to the rear of the lower edge of the rear wall and the apex of said notional heap lying forward of the lower edge of the forward wall of said outlet structure, whereby the material is deposited on the conveyor as a bed of substantially constant height, the height of said bed being equal to the height of the apex of said notional heap above the conveyor and being controllable by adjusting the front and/or rear of the base of said notional heap by adjusting the vertical height of the lower edge ouf said front and/or rear wall of the outlet structure.
The supply container may consist of a bin or chute. The outlet structure may be a funnel or a shaft and may be vertical or slightly inclined. In general, the outlet structure is filled with the solids throughout its height. It will be sufficient, how- ever, to maintain a constant level of solids at such an elevation that the continuous formation of the notional heap of solids is ensured.
In this Specification, a"notional heap" is defined as being that of the material which would build up on the conveyor, when stationary, if sufficient material were supplied through the outlet structure to form a heap of triangular section extending transversely across the conveyor with its front and rear sides (relative to the intended direction of movement of the conveyor) each inclined to the conveyor at an angle equal to that of the angle of response of the solid material, with the rear side engaging the lower edge of the rear wall of the outlet structure, and with an extension of the front side meeting the lower edge of the front wall of the outlet structure so that the apex of the notional heap lies forward of the lower edge of the front wall. It will be thus appreciated that by adjusting the vertical distances between the lower edges of said walls and the conveyor the base of the triangular section can be increased or decreased with concommitant increase or decrease in the height of the apex above the conveyor. As indicated above, the height of the apex determines the height of the bed of material on the conveyor.
By advancing the conveyor, the solids are moved freely past the lower edge of the forward wall of the outlet structure. The height of the bed which emerges from the outlet structure corresponds to the elevation of the apex of the notional heap of the deposited solids, the apex extending transversely to the conveyor throughout the width of the outlet structure.
According to one preferred embodiment, the lower edge of the rear wall of the outlet structure is disposed behind the lower edge of the forward wall. This construction will mainly be adopted when a large height of the bed formed on the conveyor is desired.
According to another preferred embodiment, the inclination of the lower portion of the rear wall of the outlet structure is smaller than the angle of response of the solids, and the lower edge of the rear wall of the outlet structure is disposed forward of the lower edge of the forward wall. This construction will mainly be adopted if a small height of the bed formed on the conveyor is desired. This construction is de sirable, e. g., for feeding grate-protecting material to a sintering machine or for feeding solids to conveyor belts having a small capacity so as to form a bed having only a small height. The entire outlet cross-section of the outlet structure will be utilized even when the resulting beds have only a small height. The rear wall may have a movable portion which carries the lower edge thereof and which may be adapted to be swung up so that in an arrangement for feeding grate-protecting material to a sintering machine said portion of the rear wall can yield upwardly to any elevation of the surface of the palets.
According to yet another preferred embodiment, the lower edge of the rear wall of the outlet structure is disposed vertically under the lower edge of the forward wall.
This construction will mainly be adopted when a constant height of the bed is to be maintained even though the angle of repose of the solids varies. In this construction, the bed is formed of the same height, regardless of the angle of slope.
The invention will be explained more fully with reference to the drawings, in which Fig. 1 shows the position of the heap of solids in an arrangement which is in accordance with the state of the art and in which the lower edge of the forward wall acts as a scraper.
Fig. 2 shows an arrangement in accordance with the invention for beds which are relative large in height.
Fig. 3 shows another embodiment for beds which are relatively large in height.
Fig. 4 shows an embodiment for beds which are small in height.
Fig. 5 shows an embodiment for beds which are very small in height. The rear wall has a movable portion which carries the lower edge thereof.
Fig. 6 shows an embodiment in which the lower edge of the rear wall is disposed vertically under the lower edge of the forward wall.
The solids flowing out of the outlet structure form a notional heap of solids on the conveyor I. The apex 2 of the notional heap of deposited solids lies at the intersection of the sides 3 and 6 of the notional heap.
The side 3 extends from the conveyor 1 at the angle of repose x of the the solids past the lower edge 4 of the rear wall 5 of the outlet structure. The side 6 extends at the angle X past the lower edge 7 of the forward wall 8. Solids in the form of a bed having the height h are withdrawn from the heap of deposited solids by the conveyor 1 mov- ing in the direction of the arrow.
In Fig. 1 it is shown that the notional heap of deposited solids has its apex between the front and rear walls of the outlet structure so that, upon movement of the conveyor, the notional heap of deposited solids is sheared off by the lower edge 7 of the forward wall 8 so that a bed is formed which has the height h.
In the embodiments shown in Figs. 2 to 6, the material moves freely past the lower edge 7 and the height h of the bed corresponds to the elevation of the apex 2 of the notional heap because this apex 2 lies forward of the lower edge 7.
It is apparent from Fig. 2 that the location of that base edge of the notional heap of deposited solids which is disposed behind the lower edge 4 is changed by a change of the vertical distance from the lower edge 4 of the rear wall to the conveyor I and that this results in a displacement of the side 3 parallel to itself to location 3', the apex of the notional heap of deposited solids is shifted to the more elevated location 2', and the bed has a larger height h'.
A change of the vertical distance from the lower edge 7 of the forward wall 8 to the conveyor 1 will change the location of that base edge of the notional heap of deposited solids which is disposed forward of the lower edge 7 so that the side 6 is displaced parallel to itself to location 6", the apex of the notional heap of deposited solids is shifted to the more elevated location 2", and the bed has a larger height h". The inclination of the rear wall 5 exceeds the angle of sliding friction of the solids thereon and the lower edge 4 of the rear wall 5 is disposed behind the lower edge 7 of the forward wall 8.
In the arrangement shown in Fig. 3, the lower portion of the wall 5 is formed with a solids-retaining pocket, on which the solids slide so that the wall is protected. The solids consist of sinter having an angle of repose of 38 .
In the arrangement shown in Fig. 4, the lower portion 9 of the rear wall 5 has an inclination which is smaller than the angle of repose of the solids. The lower edge 4 of the rear wall 5 lies forward of the lower edge 7 of the forward wall 8. An increase of the vertical distance from the lower edge 4 of the rear wall 5 to the conveyor 1 changes the location of that base edge of the notional heap of deposited solids on the conveyor which is disposed behind the lower edge 4 so that the side 3 is displaced parallel to itself to location 3', the apex of the notional heap of deposited solids is shifted to the more elevated position 2', and the bed has a larger height h'. An increase of the vertical distance from the lower edge 7 of the forward wall 8 to the conveyor 1 would result in a change which is analogous to that shown in Fig. 2.
In the arrangement shown in Fig. 5, the rear wall has a portion 10 which carries the lower edge 4 and which is movable.
It is apparent from Fig. 6 that the height of the bed will not depend on the angle of repose of the solids in an arrangement in which the lower edge 4 of the rear wall 5 is disposed vertically under the lower edge 7 of the forward wall 8. The apices 2,2', and 2"disposed at the intersections of the straight lines 3 and 6,3'and 6', and 3"and 6"always have such locations that the same height h results.
It is an advantages of the present method that the material emerges freely under the lower edge of the forward wall and that the lower edge is not required to act as a scraper so that the wear is much reduced and compaction of the solids on the conveyor is prevented.

Claims (5)

WHAT WE CLAIM IS:
1. A method of forming a bed of flowable solid material on a conveyor, wherein a continuous stream of the material is fed from an outlet structure of a supply container onto a conveyor as the latter moves below the outlet structure, the outlet structure having forward and rear walls (relative to the direction of movement of the conveyor), the rear wall having an inclination to the conveyor in excess of the angle of sliding friction-of the material, and wherein the lower edges of said walls are so disposed as to provide a notional heap (as herenbefore defined) of said material on the conveyor, the rear of the base of said notional heap lying in the rear of the lower edge of the rear wall and the apex of said notional heap lying forward of the lower edge of the forward wall of said outlet structure, whereby the material is deposited on the conveyor as a bed of the apex of said notional heap above the height of said bed being equal to the height of the apex of said notional heap abve the conveyor and being controllable by adjusting the front and/or rear of the base of said notional heap by adjusting the vertical height of the lower edge of said front and/ or rear wall of the outlet structure.
2. A method as claimed in claim 1, wherein the lower edge of the rear wall of the outlet structure is disposed behind the lower edge of the forward wall.
3. A method as claimed in claim 1, wherein the lower portion of the rear wall of the outlet structure has an inclination which is smaller than the angle of repose of the solids and the lower edge of the rear wall of the outlet structure is disposed forward of the lower edge of the forward wall.
4. A method as claimed in claim 1, wherein the lower edge of the rear wall of the outlet structure is disposed vertically under the lower edge of the forward wall.
5. A method of forming a bed of flow able solid material on a conveyor substan tially as hereinbefore described with reference to any one of Figures 2 to 6 of the accompanying drawings.
GB36255/76A 1975-09-01 1976-09-01 Method of forming a bed of flowable solid material on a conveyor Expired GB1559508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2538856A DE2538856C3 (en) 1975-09-01 1975-09-01 Process for feeding free-flowing materials onto transport devices

Publications (1)

Publication Number Publication Date
GB1559508A true GB1559508A (en) 1980-01-23

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ID=5955335

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36255/76A Expired GB1559508A (en) 1975-09-01 1976-09-01 Method of forming a bed of flowable solid material on a conveyor

Country Status (12)

Country Link
JP (1) JPS6052052B2 (en)
AU (1) AU1557576A (en)
BE (1) BE845727A (en)
BR (1) BR7605729A (en)
CA (1) CA1048957A (en)
DE (1) DE2538856C3 (en)
ES (1) ES450733A1 (en)
FR (1) FR2322072A1 (en)
GB (1) GB1559508A (en)
IT (1) IT1065235B (en)
LU (1) LU75690A1 (en)
ZA (1) ZA763754B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006035268A1 (en) * 2006-07-31 2008-02-07 Dr. August Oetker Nahrungsmittel Kg Apparatus and method for the metered dispensing of a pourable or free-flowing material

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2828696A1 (en) * 1978-06-30 1980-01-10 Tkv Transportanlagen Flowing material hopper discharge system - regulates height on conveyor by tilting upper hopper outlet wall about horizontal axis
JPS6145816A (en) * 1984-08-11 1986-03-05 Toda Kogyo Corp Method and device for quantitative and non-destructive transfer of granular materials
JPH0218021Y2 (en) * 1984-10-30 1990-05-21
CA1336040C (en) * 1988-09-13 1995-06-27 Makoto Gocho Apparatus for charging material to be sintered into a sintering machine
FR2650260A1 (en) * 1989-07-27 1991-02-01 Ermont Cm Device for distributing solid products in divided form at a regulated flow

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006035268A1 (en) * 2006-07-31 2008-02-07 Dr. August Oetker Nahrungsmittel Kg Apparatus and method for the metered dispensing of a pourable or free-flowing material

Also Published As

Publication number Publication date
AU1557576A (en) 1978-01-12
DE2538856B2 (en) 1980-03-27
BR7605729A (en) 1977-08-23
ZA763754B (en) 1977-05-25
IT1065235B (en) 1985-02-25
JPS5229069A (en) 1977-03-04
FR2322072B3 (en) 1979-04-13
JPS6052052B2 (en) 1985-11-16
FR2322072A1 (en) 1977-03-25
DE2538856A1 (en) 1977-03-03
LU75690A1 (en) 1977-04-01
BE845727A (en) 1977-02-28
DE2538856C3 (en) 1980-11-13
ES450733A1 (en) 1977-09-01
CA1048957A (en) 1979-02-20

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PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee