GB2122108A

GB2122108A - Cutter drums

Info

Publication number: GB2122108A
Application number: GB08316324A
Authority: GB
Inventors: Neil Townsend Hannan
Original assignee: KITCHIN Ltd S AND J
Current assignee: KITCHIN Ltd S AND J
Priority date: 1982-06-15
Filing date: 1983-06-15
Publication date: 1984-01-11
Also published as: GB8316324D0; GB2122108B

Abstract

The invention relates to cutter drums, e.g., for coke and the like breaking. Cutter drums are known formed from a solid shaft on which cast tooth bearing members are mounted, the members frequently being held on the shaft by concrete. The weight of such drums is high requiring a correspondingly high energy input to rotate it, and removing the drum from a machine is difficult as is removing the castings from the shaft. The object of the invention is to provide a cutter drum 1 that avoids these disadvantages, which objective is met by a construction comprising a cylindrical body 2, and cutter rings 7 secured to the cylindrical body in spaced relationship along the length thereof, each cutter ring being provided at its periphery with tooth- like formations 8. <IMAGE>

Description

SPECIFICATION Cutter drums This invention relates to cutter drums such as would be used to break up coke, clinker and the like extracted from a furnace.

Hitherto, equipment for the breaking up of coke, clinker and the like extracted from the furnace of, e.g., a power station, has utilised a roll formed as a -solid shaft on which are fitted as many as thirty or more separate castings, the castings being formed with teeth at their periphery, and with throughhole formations such that each casting can be secured to the shaft by pouring concrete down the aligned through-hole formations to prevent damage to the shaft due to backlash between shaft and castings. Inevitably, such a roll construction is heavy, and whilst well capable of serving its intended purpose, requires a high energy input to rotate the mass involved.

More importantly, the harsh operative conditions are such that there is inevitabie wear or unacceptable damage to the castings on the shaft.

The weight of the roll makes difficult the task of its removal and replacement, and the manner of securing the castings in place on the shaft is such that their removal is an arduous, time consuming task, requiring the exercise of some care to avoid unacceptable damage to the shaft. Replacement of the assembly also necessitates disturbing the bearings to remove the shaft, thus further increasing the time needed for maintenance.

The object of the present invention is to provide means for breaking up coke, clinker or the like, that avoids the above disadvantages.

According to the present invention, a cutter drum comprises a cylindrical body, and cutter rings secured to the cylindrical body in spaced relationship along the length thereof, each cutter ring being provided at its periphery with tooth-like formations. Preferably the cylindrical body is closed by an end plate at each end to prevent the ingress of dirt and debris, and when the end plates can each have a suitable arrangement of holes to allow the attachment of half-shafts or trunnions on which the drum is to rotate.

Naturally, the cutter rings and possibly the cylindrical body itself should be fabricated from a hard, wear resistant, impact resistant material.

Thus, a chrome boron alloy can be used, which also should be weldable to allow the rings and the drum end plates to be secured in place by welding.

The invention, therefore, provides a construction that is considerably lighter than the prior roll constructions with a consequent lowering of the bearing load and energy requirement to rotate the roll at the required speed, and with a consequent easing of the task of its removal and replacement. Also, the complete removal of a worn drum assembly is noticeably easier than the prior art constructions and the removal of the discs from the drum is noticeably easier than the removal of the castings from the shaft in the prior art constructions.

The cylindrical body may be a separate fabrication from, e.g., a chrome boron alloy, although it is possible to form the body from a less expensive material, and to utilise the ringsto protect the body surface. Thus, each ring may be of generally L-shaped sectional configuration, the inturned foot of which is adapted to bear against the outer surface of the body and be there secured, e.g., by welding. With such a construction, and with the inturned foot of one ring abutting the adjacent ring, the entire surface of the body is encased by the rings.

As a still further possibility, a drum per se can be dispensed with. Thus, rings of generally Lshaped section can be used, and with the inturned feet of the rings suitably secured to adjacent rings, the inturned feet effectively constitute the cylindrical body from which extend the legs of the rings, possibly with one or more axial restraining rods to strengthen the assembly.

One embodiment of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a side elevation of a cutter drum in accordance with the invention; Figure 2 is a vertical section through the drum of Figure 1; and Figure 3 is an end elevation of Figure 1.

In the drawings, a cutter drum 1 is formed from a cylindrical body or centre tube 2 of a hard, wear resistant, impact resistant material such as chrome boron alloy, closed at each end by end plates 3 welded to the inner wall of the cylindrical body. At each end of the cylindrical body, a trunnion 4 is provided, each trunnion being provided with an annular flange 5 secured by welding to the trunnion, and the trunnions being secured to the respective end plate 3 by a number of equally spaced bolts 6 engaging corresponding threaded holes in the end plate.

Mounted on the cylindrical body 2 are a number of equally spaced rings 7,of a hard, wear resistant, impact resistant material such as chrome boron alloy, each ring 7 being welded to the body, and each ring being formed with a number of tooth-like formations 8, the front edges 9 of which all face the direction of rotation of the drum. Thus, the teeth can then grip coke or the like fed between the drum and a fixed plate, or two contra-rotating drums could be used, when the teeth would grip coke or the like fed into the nip between the drums.

1. A cutter drum comprising a cylindrical body, and cutter rings secured to the cylindrical body in spaced relationship along the length thereof, each cutter ring being provided at its periphery with tooth-like formations.

2. A cutter drum as in Claim 1, wherein the cylindrical body is closed by an end plate.

3. A cutter drum as in Claim 2, wherein the end plates each have a suitable arrangement of holes to allow the attachment of half-shafts or trunnions on which the drum is to rotate.

4. A cutter drum as in any of Claims 1 to 3,

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Cutter drums This invention relates to cutter drums such as would be used to break up coke, clinker and the like extracted from a furnace. Hitherto, equipment for the breaking up of coke, clinker and the like extracted from the furnace of, e.g., a power station, has utilised a roll formed as a -solid shaft on which are fitted as many as thirty or more separate castings, the castings being formed with teeth at their periphery, and with throughhole formations such that each casting can be secured to the shaft by pouring concrete down the aligned through-hole formations to prevent damage to the shaft due to backlash between shaft and castings. Inevitably, such a roll construction is heavy, and whilst well capable of serving its intended purpose, requires a high energy input to rotate the mass involved. More importantly, the harsh operative conditions are such that there is inevitabie wear or unacceptable damage to the castings on the shaft. The weight of the roll makes difficult the task of its removal and replacement, and the manner of securing the castings in place on the shaft is such that their removal is an arduous, time consuming task, requiring the exercise of some care to avoid unacceptable damage to the shaft. Replacement of the assembly also necessitates disturbing the bearings to remove the shaft, thus further increasing the time needed for maintenance. The object of the present invention is to provide means for breaking up coke, clinker or the like, that avoids the above disadvantages. According to the present invention, a cutter drum comprises a cylindrical body, and cutter rings secured to the cylindrical body in spaced relationship along the length thereof, each cutter ring being provided at its periphery with tooth-like formations. Preferably the cylindrical body is closed by an end plate at each end to prevent the ingress of dirt and debris, and when the end plates can each have a suitable arrangement of holes to allow the attachment of half-shafts or trunnions on which the drum is to rotate. Naturally, the cutter rings and possibly the cylindrical body itself should be fabricated from a hard, wear resistant, impact resistant material. Thus, a chrome boron alloy can be used, which also should be weldable to allow the rings and the drum end plates to be secured in place by welding. The invention, therefore, provides a construction that is considerably lighter than the prior roll constructions with a consequent lowering of the bearing load and energy requirement to rotate the roll at the required speed, and with a consequent easing of the task of its removal and replacement. Also, the complete removal of a worn drum assembly is noticeably easier than the prior art constructions and the removal of the discs from the drum is noticeably easier than the removal of the castings from the shaft in the prior art constructions. The cylindrical body may be a separate fabrication from, e.g., a chrome boron alloy, although it is possible to form the body from a less expensive material, and to utilise the ringsto protect the body surface. Thus, each ring may be of generally L-shaped sectional configuration, the inturned foot of which is adapted to bear against the outer surface of the body and be there secured, e.g., by welding. With such a construction, and with the inturned foot of one ring abutting the adjacent ring, the entire surface of the body is encased by the rings. As a still further possibility, a drum per se can be dispensed with. Thus, rings of generally Lshaped section can be used, and with the inturned feet of the rings suitably secured to adjacent rings, the inturned feet effectively constitute the cylindrical body from which extend the legs of the rings, possibly with one or more axial restraining rods to strengthen the assembly. One embodiment of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a side elevation of a cutter drum in accordance with the invention; Figure 2 is a vertical section through the drum of Figure 1; and Figure 3 is an end elevation of Figure 1. In the drawings, a cutter drum 1 is formed from a cylindrical body or centre tube 2 of a hard, wear resistant, impact resistant material such as chrome boron alloy, closed at each end by end plates 3 welded to the inner wall of the cylindrical body. At each end of the cylindrical body, a trunnion 4 is provided, each trunnion being provided with an annular flange 5 secured by welding to the trunnion, and the trunnions being secured to the respective end plate 3 by a number of equally spaced bolts 6 engaging corresponding threaded holes in the end plate. Mounted on the cylindrical body 2 are a number of equally spaced rings 7,of a hard, wear resistant, impact resistant material such as chrome boron alloy, each ring 7 being welded to the body, and each ring being formed with a number of tooth-like formations 8, the front edges 9 of which all face the direction of rotation of the drum. Thus, the teeth can then grip coke or the like fed between the drum and a fixed plate, or two contra-rotating drums could be used, when the teeth would grip coke or the like fed into the nip between the drums. CLAIMS

4. A cutter drum as in any of Claims 1 to 3, wherein the cutter rings and the cylindrical body are fabricated from a hard, wear resistant, impact resistant material.

5. A cutter drum as in any of Claims 1 to 3, wherein the cylindrical body and the cutter rings are formed from different materials, the cutter rings being of generally L-shape, the inturned foot of one ring abutting an adjacent ring, and being adapted two bear against the outer surface of the body and be there secured.

6. A cutter drum as in any of Claims 1 to 3, wherein the cutter rings are generally L-shaped with the inturned foot of one ring abutting and being secured to an adjacent ring, the inturned feet of all the rings constituting the cylindrical body.

7. A cutter drum substantially as hereinbefore described with reference to the accompanying drawings.