METHOD AND APPARATUS FOR INSTALLING AND REMOVING A SLEEVE

Abstract

The invention relates to a method for removing a roller tire (3) shrink fitted to a roller core (2) of a roller-press roller (1) where the roller tire is expanded by heating and pulled off the roller core. This method is characterized in that the roller tire is inductively heated with an induction coil (4).

Claims

1. In a method for removing a roller tire shrink fitted to a roller core of a roller-press roller or for fitting the tire to the core, where the roller tire is expanded by heating and pulled off the roller core or slid onto the core and cooled to contract it, the improvement comprising the step of inductively the tire with at least one induction coil to expand or contract it.

2. (canceled)

3. The method according to claim 1, wherein the roller tire is thick-walled and has a wall thickness of more than 100 mm.

4. The method according to claim 1, wherein the roller tire has an outer diameter of more than 1000 mm.

5. The method according to claim 1, wherein the induction coil is operated with an alternating current with a frequency of 1 kHz to 20 kHz.

6. The method according to claim 1, further comprising the step of: cooling the roller core during or prior to heating of the roller tire.

7. The method according to claim 6, wherein the roller is cooled by flowing a cooling medium through the roller core via a core hole.

8. An apparatus for removing a roller tire from and/or mounting a roller tire onto a roller core by respectively heating the tire and sliding it off the core or cooling the roller core to shrink it onto the core, the apparatus comprising: at least one induction device having at least one induction coil that surrounds the roller tire and at least one current supply for the induction coil.

9. The apparatus according to claim 8, wherein the induction coil is formed by a flexible induction cable that is wound around the roller tire.

10. The apparatus according to claim 8, wherein the induction coil a rigid induction coil that is slid over the roller tire.

11. The apparatus according to claim 8, wherein the induction coil is provided with a water cooler.

12. The apparatus according to claim 8, wherein the apparatus has multiple separately controllable induction coils distributed adjacent one another over an axial length of the roller.

13. The apparatus according to claim 8, further comprising: a thermal insulator surrounding the roller tire and surrounded by the induction coil.

Description

[0020] The invention is described below in greater detail with reference to drawings illustrating one embodiment, wherein:

[0021] FIG. 1 shows a known roller-press roller with roller core and roller tire,

[0022] FIG. 2 shows the roller-press roller according to claim 1 with the mounted induction apparatus for removing the roller tire by heat expansion, in a first embodiment, and

[0023] FIG. 3 shows a modified embodiment of the invention.

[0024] FIG. 1 shows a known roller-press roller 1 that has a roller core 2 and a roller tire 3 shrink fitted onto same. Such a roller tire 3 can be provided with a wear-resistant coating, and/or with briquetting or compacting tools. Details are shown.

[0025] Heating by induction is used to remove the shrink fitted roller tire. For this purpose, an induction device that has an induction coil 4 and an unillustrated current supply, is used. The induction coil 4 surrounds the roller tire 3 such that the roller tire 3 is heated inductively via the induction coil through which current flows. During heating of the roller tire 3, it expands, and specifically to a greater degree than the roller core 2, such that the roller tire 3 can be detached and pulled off the roller core 2.

[0026] In the embodiment shown in FIG. 2, the induction coil 4 is formed by a flexible induction cable 5 that is wound around the roller tire 3. This induction cable 5 can be cooled by water.

[0027] In addition, FIG. 2 shows that the roller core 2 is likewise cooledspecifically by water cooling. For this purpose, cooling water K flows through an existing core hole 6. However, the cooling water K does not flow through the core hole 6 directly. Rather, a cooling lance (not illustrated) is inserted into the core, and cooling water flows through the lance. In any case, additional cooling of the roller core 2 particularly effectively prevents heating of the roller core 2, such that the desired temperature gradient is established very quickly. In addition, it can also be seen in FIG. 2 that the induction coil 4 surrounds the roller tire 3 with a thermal insulation situated in-between. The flexible induction cable 5 is wound on an insulation layer 7 that surrounds the roller tire 3.

[0028] FIG. 3 shows an alternative embodiment in which the induction coil 4 is not formed by a flexible induction cable, but rather a rigid induction coil. The roller tire 3 and/or the roll 1 with the roller tire is consequently inserted into this rigid induction coil 4 and/or into the interior space thereof. In this case, the induction coil 4 is therefore adapted to the outer diameter of the roller tire being shrink fitted or removed by heat expansion.

[0029] Even though the figures show the removal by heat expansion of a mounted roller tire by way of example, the induction devices shown can likewise be used to heat the roller tire in the course of the shrink fitting of the roller tire.