GB2094453A

GB2094453A - Rotary kiln tyre

Info

Publication number: GB2094453A
Application number: GB8136566A
Authority: GB
Original assignee: HADEE ENGINEERING CO Ltd
Current assignee: HADEE ENGINEERING CO Ltd
Priority date: 1981-02-28
Filing date: 1981-12-03
Publication date: 1982-09-15
Also published as: GB2094453B

Abstract

A kiln tyre 1 for a kiln rotating about an axis 2 comprises a plurality of co-axial rings 3 assembled together in laminated fashion to define the width W required for the tyre 1, with each ring 3 comprising a plurality of arcuate segments and with the joints 5 between adjacent segments of one ring 3 being staggered with respect to the joints 5 between the segments of an adjacent ring 3. <IMAGE>

Description

SPECIFICATION Rotary kiln tyre This invention relates to a rotary kiln tyre of the kind adapted to be located at spaced locations, e.g. every 1 00-ft. along a 440-yard long rotary kiln, for the purpose of rotatably supporting the kiln at correspondingly spaced support and/or drive stations.

Conventionally, kiln tyres are cast and machined in one piece and may weigh 10-1 00 tons. This results in considerable handling problems not only during manufacture, but also during transportation to, and assembly on, the kiln. Furthermore, upon the tyre becoming worn or damaged, a time consuming and hence costly replacement process is involved taking perhaps two to three weeks, resulting from a need to split the kiln.

According to the present invention, a kiln tyre comprises a plurality of co-axial rings assembled together in laminated fashion to define the width required for the tyre, with each ring comprising a plurality of arcuate segments and with the joints between adjacent segments of one ring being staggered with respect to the joints between the segments of an adjacent ring.

Thus, a one piece tyre is avoided, for the tyre in accordance with the invention is assembled from a multiplicity of arcuate segments. In practice, this means that splitting of a kiln to fit a tyre can be avoided and that fitting of the tyre in accordance with the invention can be effected in approximately three days. Furthermore, each arcuate segment may weigh no more than 1-2 tons and hence present relatively simple handling problems at both the manufacture and fitting stages.

Preferably, the rings are secured together by a plurality of parallel, axially extending bolts, while the joints between adjacent arcuate segments may be butt joints. If the tyre is a thrust tyre (in contrast to an ordinary tyre) to accept thrust rollers at one or both sides to constrain the kiln from axial movement, the bolt heads and securing nuts are preferably countersunk so as to present no obstruction in the vicinity of a running surface for the thrust roller(s). In detail, counterbores in each of which a bolt head and securing nut are respectively located are preferably threaded to receive a screwed closure cap, itself secured by a screw. For an ordinary tyre then a lock nut would be applied to the bolt stems to lock each securing nut in position and hence to restrain any loosening due to the vibrations encountered in service.It is also preferred for each tyre to consist of four arcuate segments, each subtending a 900 angle.

In detail, a tyre in accordance with the invention might comprise 4, 8, or 1 3 rings laminated together, secured to example by 32 bolts The invention will now be further described, by way of examples, with reference to the accompanying drawings in which: Figure 1 is a side elevation of a first embodiment of kiln tyre in accordance with the invention; Figure 2 is an end elevation of Figure 1; Figure 3 is a section, to an enlarged scale, on the line Ill-Ill of Figure 1; Figure 4 is a side elevation of a second embodiment of kiln tyre according to the invention; Figure 5 is an end elevation of Figure 4; and Figure 6 is a section, to an enlarged scale on the line VI--VI of Figure 4.

In both embodiments like components are accorded like reference numerals.

A kiln tyre 1 having a central axis of rotation 2 comprises a plurality of co-axial rings 3, eight rings being illustrated in the embodiment of Figures 1 to 3, as can be seen from Figure 2. The rings 3 are assembled together in laminated fashion to provide the tyre 1 with a width W of desired dimension, for the particular service conditions to be encountered by the kiln tyre 1. As best seen in Figure 1, each ring 3 comprises four arcuate segments 4 each subtending a 900 arc A, the segments being butted together at joints 5, and as illustrated in Figure 2, it is arranged for the joints 5 of adjacent rings 3 to be staggered around the periphery of the tyre 1.The rings 3 are secured together by a plurality of axially extending bolts 6 (for clarity omitted from Figures 1 and 2), with thirty two such bolts being employed in the kiln tyres of both embodiments, bolt stems 7 being passed through aligned apertures 8 in the ring segments 4, securing being effected by means of a securing nut 9 and lock nut 10 at an end of each stem 7 remote from bolt head 11.

The embodiment of Figures 4 to 6 is of the tyre kind that is intended to accept thrust rollers at one or both sides thereof, in order to constrain the kiln (that is in service located within, and carried by, the tyre 1) from axial movement. In detail, this embodiment comprises four co-axial rings 3, the outer rings having running surfaces 12 for thrust rollers and being counterbored at 13 so that each bolt head 11 and securing nut 9 may be countersunk so as to present no obstruction in the vicinity of the running surfaces 12. Each counterbore 13 is screw threaded at 14 to receive a screwed closure cap 1 5, each of which is in turn secured by a locking screw 1 6 as shown in Figure 4.

1. A kiln tyre comprising a plurality of co-axial rings assembled together in laminated fashion to define the width required for the tyre, with each ring comprising a plurality of arcuate segments and with the joints between adjacent segments of one ring being staggered with respect to the joints between the segments of an adjacent ring.

2. A kiln tyre as claimed in Claim 1, wherein the rings are secured together by a plurality of parallel, axially extending bolts.

3. A kiln tyre as claimed in Claim 1 or Claim 2, wherein the joints between adjacent arcuate segments are butt joints.

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

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Rotary kiln tyre This invention relates to a rotary kiln tyre of the kind adapted to be located at spaced locations, e.g. every 1 00-ft. along a 440-yard long rotary kiln, for the purpose of rotatably supporting the kiln at correspondingly spaced support and/or drive stations. Conventionally, kiln tyres are cast and machined in one piece and may weigh 10-1 00 tons. This results in considerable handling problems not only during manufacture, but also during transportation to, and assembly on, the kiln. Furthermore, upon the tyre becoming worn or damaged, a time consuming and hence costly replacement process is involved taking perhaps two to three weeks, resulting from a need to split the kiln. According to the present invention, a kiln tyre comprises a plurality of co-axial rings assembled together in laminated fashion to define the width required for the tyre, with each ring comprising a plurality of arcuate segments and with the joints between adjacent segments of one ring being staggered with respect to the joints between the segments of an adjacent ring. Thus, a one piece tyre is avoided, for the tyre in accordance with the invention is assembled from a multiplicity of arcuate segments. In practice, this means that splitting of a kiln to fit a tyre can be avoided and that fitting of the tyre in accordance with the invention can be effected in approximately three days. Furthermore, each arcuate segment may weigh no more than 1-2 tons and hence present relatively simple handling problems at both the manufacture and fitting stages. Preferably, the rings are secured together by a plurality of parallel, axially extending bolts, while the joints between adjacent arcuate segments may be butt joints. If the tyre is a thrust tyre (in contrast to an ordinary tyre) to accept thrust rollers at one or both sides to constrain the kiln from axial movement, the bolt heads and securing nuts are preferably countersunk so as to present no obstruction in the vicinity of a running surface for the thrust roller(s). In detail, counterbores in each of which a bolt head and securing nut are respectively located are preferably threaded to receive a screwed closure cap, itself secured by a screw. For an ordinary tyre then a lock nut would be applied to the bolt stems to lock each securing nut in position and hence to restrain any loosening due to the vibrations encountered in service.It is also preferred for each tyre to consist of four arcuate segments, each subtending a 900 angle. In detail, a tyre in accordance with the invention might comprise 4, 8, or 1 3 rings laminated together, secured to example by 32 bolts The invention will now be further described, by way of examples, with reference to the accompanying drawings in which: Figure 1 is a side elevation of a first embodiment of kiln tyre in accordance with the invention; Figure 2 is an end elevation of Figure 1; Figure 3 is a section, to an enlarged scale, on the line Ill-Ill of Figure 1; Figure 4 is a side elevation of a second embodiment of kiln tyre according to the invention; Figure 5 is an end elevation of Figure 4; and Figure 6 is a section, to an enlarged scale on the line VI--VI of Figure 4. In both embodiments like components are accorded like reference numerals. A kiln tyre 1 having a central axis of rotation 2 comprises a plurality of co-axial rings 3, eight rings being illustrated in the embodiment of Figures 1 to 3, as can be seen from Figure 2. The rings 3 are assembled together in laminated fashion to provide the tyre 1 with a width W of desired dimension, for the particular service conditions to be encountered by the kiln tyre 1. As best seen in Figure 1, each ring 3 comprises four arcuate segments 4 each subtending a 900 arc A, the segments being butted together at joints 5, and as illustrated in Figure 2, it is arranged for the joints 5 of adjacent rings 3 to be staggered around the periphery of the tyre 1.The rings 3 are secured together by a plurality of axially extending bolts 6 (for clarity omitted from Figures 1 and 2), with thirty two such bolts being employed in the kiln tyres of both embodiments, bolt stems 7 being passed through aligned apertures 8 in the ring segments 4, securing being effected by means of a securing nut 9 and lock nut 10 at an end of each stem 7 remote from bolt head 11. The embodiment of Figures 4 to 6 is of the tyre kind that is intended to accept thrust rollers at one or both sides thereof, in order to constrain the kiln (that is in service located within, and carried by, the tyre 1) from axial movement. In detail, this embodiment comprises four co-axial rings 3, the outer rings having running surfaces 12 for thrust rollers and being counterbored at 13 so that each bolt head 11 and securing nut 9 may be countersunk so as to present no obstruction in the vicinity of the running surfaces 12. Each counterbore 13 is screw threaded at 14 to receive a screwed closure cap 1 5, each of which is in turn secured by a locking screw 1 6 as shown in Figure 4. CLAIMS

4. A kiln tyre as claimed in Claim 2 or Claim 3 when appendant to Claim 1, in an embodiment where the tyre is a thrust type to accept thrust rollers at one or both sides to constrain the kiln from axial movement, wherein the bolt heads and securing nuts are countersunk so as to present no obstructions in the vicinity of a running surface for the thrust roller(s).

5. A kiln tyre as claimed in Claim 5, wherein counterbores in each of which a bolt head and securing nut are respectively located are threaded to receive a screwed closure cap, itself secured by a screw.

6. A kiln tyre as claimed in any one of Claims 1 to 3, wherein a lock nut is applied to the bolt stems to lock each securing nut in position.

7. A kiln tyre as claimed in any preceding Claim, wherein each co-axial ring consists of four arcuate segments.

8. A kiln tyre as claimed in Claim 7, wherein each segment subtends an angle of 90".

9. A kiln tyre as claimed in any preceding Claim, comprising four co-axial rings laminated together.

10. A kiln tyre as claimed in any one of Claims 1 to 8, comprising eight co-axial rings laminated together.

11. A kiln tyre as claimed in any one of Claims 1 to 8, comprising thirteen co-axial rings laminated together.

12. A kiln tyre substantially as hereinbefore described with reference to Figures 1 to 3 of the accompanying drawings.

13. A kiln tyre substantially as hereinbefore described with reference to Figures 4 to 6 of the accompanying drawings.