GB1586873A

GB1586873A - Apparatus for comminuting hot sintered material

Info

Publication number: GB1586873A
Application number: GB2970977A
Authority: GB
Original assignee: Krupp Koppers GmbH
Current assignee: Krupp Koppers GmbH
Priority date: 1976-07-16
Filing date: 1977-07-14
Publication date: 1981-03-25
Also published as: BE856558A; LU77769A1; FR2358196B1; JPS5311351A; FR2358196A1; JPS6018217B2; CA1101816A; NL7707156A; DE2632061A1

Description

(54) APPARATUS FOR COMMINUTING HOT SINTERED MATERIAL (71) We, KRUPP-KOPPERS GESELL SCHAFT MIT BESCHRANKTER HAFTUNG, a Company of the Federal Republic of Ger many of Moltkestråsse 29,- -4300 Lessen, West Germany, do hereby declare the invention, for which we pray that a patent may be granted two us, and the method by which it is to be performed, to be particulafly- des- cribed in and by the- fpllowing statement:: This invention'relates td crushing appa ratus-for comminuting hot sintered material, such apparatus comprising a rotatable crusher shaft having a plurality of crusher arms disposed thereon, and a grate'cooperat- ing with the crusher arms.

In crushing - apparatus - of such construc tion, the grate conventionally comprises a horizontal or inclinéd bar grate having a plurality of bars so spaced apart that; each crusher arm is adapted to pass between a corresponding gap ' between two adjacent bars.A consequence of such an arrangement is that a particular zone of the bars of--the grate is subjected to very high stresses during a crushing operation as a result of thè mechanical action of the crusher armS::"In the case of crushing apparatus for the corn- minution of hot sintered material exiting a sintering plant, the grate parts are in addi tion exposed almost continuously to inten sive heat, causing additional'stresses in the grate parts.

As a result of these stresses the bars of the grate are subject to comparatively inten sive wear, and therefore have to be replaced at intervals. Replacement of grate bars not only entails' expenditure for the necessary 'materials and labour, but, more importantly, involves interrupting operations of the crush ing apparatus with adverse effects on the economy of, for example, a complete sinter ing plant.

The object of the invention is therefore to provide crushing apparatus for comminut ing hot sintered material, the grate of which can- have an appreciably length-ened grate life compared with that of conventional grates. To this end, according to the inven tion, the grate of such crushing apparatus is formed from plates mounted on a shaft.

Accordingly, one aspect of the invention provides crushing apparatus for comminut ing hot sintered material, comprising a rotat- able crusher shaft having 'a plurality of crusher arms disposed thereon; and a grate adapted to cooperate with the crusher arms and comprising a plurality of rotatable plates mounted on a grate shaft.

The plates can be of various configura tions. For example, the plates can be disc' like, with a circular cross-section. Such cir culariplates may be mounted on the grate shaft for rotation with respect to'the shaft 'such that in use of the crushing apparatus rotation of the crusher arm and consequent movement of'the material to be comminuted causes the plates to rotate in the opposite 'direction to that of the crusher arms.Alter- natively, such circular plates may be fixed in rotation to the grate shaft, so that the plates --and shaft may rotate together in the direction opposite to the direction of rota tion of the crusher arms: such rotation of the plates and shaft may be caused either by the action of material moved by the crusher arms, or by drive means adapted to cause rotation of the grate shaft and con stituted either by the crusher shaft drive means or by separate drive means.

Rotation of circular plates as described above results in different parts of the peri phery of the plates being subjected to the mechanical and heat stresses discussed above.

Because the periphery of each plate is many times greater than the zone subjected to stress at any particular time, the life of the grate thus constructed is increased as com- pared with grates of conventional construc tion.

The plates may also be constructed as polygons, for example hexagons, the plates bring fixed in rotation to the grate shaft with corresponding faces of the plates aligned in parallel relationship. In this case, in use of the crushing- apparatus the shaft and plates are fixed in position with a set of aligned faces of the plates disposed in an operative position and constituting a horizontal or in clined grate surface. In the event of wear of a particular set of faces of the plates, the grate shaft is rotated to bring an unworn set of aligned faces of the plates into the operative position. In this manner it is thus possible to provide a grate with a very much extended life as compared with conventional grates.Moreover, rotation of the grate shaft requires no special materials and little labour, and can be carried out very rapidly, reducing the time during which crushing operations need be interrupted for replacement of a worn grate.

Advantageously, a reception table is provided upstream of the crushing apparatus for receiving hot sintered material to be crushed, e.g. from a sintering machine, and for absorbing the impact forces of the material received, and thereafter supplying the material to the grate for crushing.

The life of the grate of crushing apparatus in accordance with the invention may be further prolonged by applying a cooling medium, preferably water, to the plates at a location before and/or after the region in which crushing occurs in the crushing apparatus.

The invention will be further described by way of example, with reference to the accompanying drawings, wherein: FIGURE 1 is a side elevation of one embodiment of crushing apparatus according to the invention and provided with circular cross-section plates; FIGURE 2 is a partial plan view of the embodiment of Figure 1; and FIGURE 3 is a side elevation of another embodiment of crushing apparatus according to the invention and provided with plates having a hexagonal cross-section.

Referring to Figures 1 and 2, the illustrated arrangement comprises an inclined reception table 1 for receiving hot sintered material to be crushed, e.g. sintered material discharged from a sintering plant. Crushing apparatus is disposed at the lower end of the table 1 and comprises a horizontal crusher shaft 2 having a plurality of crusher arms 3 fixed thereon in a series of vertical planes.

In the illustrated embodiment, three crusher arms are provided in each vertical plane.

The shaft 2 and the crusher arms 3 are adapted to rotate together in the direction of arrow A.

The crusher arms 3 cooperate with a crusher grate comprising a rotatable horizontal shaft 4, on which are fixed in rotation a plurality of circular cross-section plates or discs 5. The discs 5 are so arranged and constructed that each of the crusher arms 3 can pass between a corresponding gap between two adjacent discs in a crushing zone.

A series of nozzles 6 supply water to the periphery of the discs 5 upstream of the crushing zone to cool the discs 5, and thereby prolong the life of the grate.

In use of the arrangement, material to be crushed is fed to the receiving table 1 and thereafter supplied to the crushing zone of the crushing apparatus. The crusher shaft 2 and the attached crusher arms 3 are rotated in the direction A, the arms 3 passing between corresponding gaps between the discs 5, thereby crushing the material and causing the discs 5 and shaft 4 to rotate in the direction of arrow B.

The embodiment of Figure 3 is of similar construction to the above described embodiment, but includes a series of hexagonal cross-section plates 7 in place of the circular discs 5. The plates 7 are fixed in rotation to the shaft 4 with corresponding faces of the plates aligned in parallel relationship.

In use, the shaft 4 and plates 7 are fixed in position with a set of aligned faces of the plates disposed in an operative position: in the arrangement illustrated the aligned faces 8 are disposed in the operative position and constitute an inclined crushing zone comparable to the bars of the conventional grate.

The shaft 4 and plates 7 can be easily rotated to bring a different set of aligned faces, for example faces 9, into the operative position to provide a replacement crushing zone in the event of wear of a set of aligned faces.

WHAT WE CLAIM IS:- 1. Crushing apparatus for comminuting hot sintered material, comprising a rotatable crusher shaft having a plurality of crusher arms disposed thereon; and a grate adapted to cooperate with the crusher arms and comprising a plurality of rotatable plates mounted on a grate shaft.

2. Apparatus according to claim 1, wherein the plates each have a circular crosssection.

3. Apparatus according to claim 2, wherein said plates are secured to the grate shaft for rotation therewith.

4. Apparatus according to claim 3, including drive means for causing rotation of the grate shaft.

5. Apparatus according to claim 1, wherein the plates each have a polygonal cross-section and are secured to the grate shaft for rotation therewith.

6. Apparatus according to claim 5, wherein the plates each have a hexagonal cross-section.

7. Apparatus according to any one of the preceding claims, including means for applying a cooling medium to the plates.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. operative position. In this manner it is thus possible to provide a grate with a very much extended life as compared with conventional grates. Moreover, rotation of the grate shaft requires no special materials and little labour, and can be carried out very rapidly, reducing the time during which crushing operations need be interrupted for replacement of a worn grate. Advantageously, a reception table is provided upstream of the crushing apparatus for receiving hot sintered material to be crushed, e.g. from a sintering machine, and for absorbing the impact forces of the material received, and thereafter supplying the material to the grate for crushing. The life of the grate of crushing apparatus in accordance with the invention may be further prolonged by applying a cooling medium, preferably water, to the plates at a location before and/or after the region in which crushing occurs in the crushing apparatus. The invention will be further described by way of example, with reference to the accompanying drawings, wherein: FIGURE 1 is a side elevation of one embodiment of crushing apparatus according to the invention and provided with circular cross-section plates; FIGURE 2 is a partial plan view of the embodiment of Figure 1; and FIGURE 3 is a side elevation of another embodiment of crushing apparatus according to the invention and provided with plates having a hexagonal cross-section. Referring to Figures 1 and 2, the illustrated arrangement comprises an inclined reception table 1 for receiving hot sintered material to be crushed, e.g. sintered material discharged from a sintering plant. Crushing apparatus is disposed at the lower end of the table 1 and comprises a horizontal crusher shaft 2 having a plurality of crusher arms 3 fixed thereon in a series of vertical planes. In the illustrated embodiment, three crusher arms are provided in each vertical plane. The shaft 2 and the crusher arms 3 are adapted to rotate together in the direction of arrow A. The crusher arms 3 cooperate with a crusher grate comprising a rotatable horizontal shaft 4, on which are fixed in rotation a plurality of circular cross-section plates or discs 5. The discs 5 are so arranged and constructed that each of the crusher arms 3 can pass between a corresponding gap between two adjacent discs in a crushing zone. A series of nozzles 6 supply water to the periphery of the discs 5 upstream of the crushing zone to cool the discs 5, and thereby prolong the life of the grate. In use of the arrangement, material to be crushed is fed to the receiving table 1 and thereafter supplied to the crushing zone of the crushing apparatus. The crusher shaft 2 and the attached crusher arms 3 are rotated in the direction A, the arms 3 passing between corresponding gaps between the discs 5, thereby crushing the material and causing the discs 5 and shaft 4 to rotate in the direction of arrow B. The embodiment of Figure 3 is of similar construction to the above described embodiment, but includes a series of hexagonal cross-section plates 7 in place of the circular discs 5. The plates 7 are fixed in rotation to the shaft 4 with corresponding faces of the plates aligned in parallel relationship. In use, the shaft 4 and plates 7 are fixed in position with a set of aligned faces of the plates disposed in an operative position: in the arrangement illustrated the aligned faces 8 are disposed in the operative position and constitute an inclined crushing zone comparable to the bars of the conventional grate. The shaft 4 and plates 7 can be easily rotated to bring a different set of aligned faces, for example faces 9, into the operative position to provide a replacement crushing zone in the event of wear of a set of aligned faces. WHAT WE CLAIM IS:-

1. Crushing apparatus for comminuting hot sintered material, comprising a rotatable crusher shaft having a plurality of crusher arms disposed thereon; and a grate adapted to cooperate with the crusher arms and comprising a plurality of rotatable plates mounted on a grate shaft.

8. Apparatus according to any one of

the preceding claims, including an inclined reception table for receiving hot sintered material to be comminuted.

9. Apparatus according to any one of the preceding claims, wherein the grate shaft is disposed in a horizontal plane.

10. Crushing apparatus substantially as hereinbefore described with reference to, and as shown in, Figures 1 and 2 of the accompanying drawings.

11. Crushing apparatus substantially as hereinbefore described with reference to, and as shown in, Figure 3 of the accompanying drawings.