MXPA97003080A

MXPA97003080A - Set of rollers for the transportation of elevatory temperature

Info

Publication number: MXPA97003080A
Application number: MXPA/A/1997/003080A
Authority: MX
Inventors: Gautier David
Original assignee: Vesuvius France Sa
Priority date: 1994-10-31
Filing date: 1997-04-28
Publication date: 1998-04-01

Abstract

A roller assembly for transporting articles at elevated temperature comprises: a ceramic roller comprising a longitudinal axis and comprising two ends, at least one metal endpiece of generally cylindrical shape mounted to at least one end of the roller; elements, interposed between the end of the roller and the endpiece, for ligating the endpiece and the screw (2) in rotation, to axially retain the endpiece (4) relative to the roller 92), and to center the roller (2) in relation to to the tip (4). Elements (10) for centering the roller in relation to the end piece (4) are different and independent of the elements (12) for connecting the endpiece and the roller 92) in rotation and for axially retaining the endpiece (4) relative to the roller 02). The elements (10) for centering the roller in relation to the endpiece (4) can be constituted by bimetallic elements (14) or by elastic elements (16) longitudinal or radial

Description

SET OF ROLLERS FOR THE TRANSPORTATION OF ARTICLES AT HIGH TEMPERATURE The invention relates to a set of rollers for transporting articles at elevated temperature. More precisely, it relates to a set of rollers for transporting articles at elevated temperature, comprising: a ceramic roller comprising a longitudinal axis and comprising two extremities; at least one metallic end piece with a generally cylindrical shape, mounted at least at one end of the roller; means, interposed between the end of the roller and the end piece, for ligating the endpiece and the roller in rotation, for axially retaining the endpiece relative to the roller, and for centering the roller relative to the endpiece. The tempering or glass annealing or plate transport facilities comprising a conveyor in which the roller assemblies transport the articles such as glass sheet or steel sheets. These roller assemblies generally consist of a roller, for example, of fused silica, and two metal ferrules mounted on each of the extremities of the roller. The ferrules are carried in rotation or a transmission mechanism that is part of the transported for example by means of chains or gears. It is important to ensure a bond in effective rotation between the ferrules and the roller. Indeed, any rolling of the roller in relation to the tip involves a marking of the articles, furthermore, this link must be secured at an elevated temperature which can reach 700SC. This temperature imposes problems of differential expansion between the roller and the metal end, whose expansion is much more important. In order to compensate for this expansion, elastic elements have already been used. For example, US-A-4, 404,011 discloses spring plates and US-A-4,399,598 discloses cracked elastic rings. However, with this type of solution, the transmission of a torque between the roller and the tip is ensured by friction. Either the modulus of elasticity and the closing of the elastic elements fall to the operating temperature. The torque transmission is therefore not ensured correctly. According to another known solution of document EP 0 615 960, bimetallic elements are used whose camber? mint at the same time as the temperature. In this way, the fall in the characteristics of the materials at high temperature is substantially compensated. However, in this solution likewise, the transmission of a torque between the roller and the friction end is not ensured correctly. It is also known from US-A-5, 146, 675 roller assemblies in which the connection between the roller and the end piece is secured by means of a support key on the plane. This means allows an effective rotation link. The ferrule is equally well retained axially and can not be desoldered from the roller. But the centering of the roller in relation to the ferrules is very mediocre in view of the annular space that appears at high temperature between the ferrules and the roller. In addition, at high temperature, after differential thermal expansion of the ferrule, a play appears between the key and the plane. In addition, the tip rotates slightly in relation to the roller until the edge of the key is brought back into contact with the plane. When the roller cools, the end retakes its initial dimensions, and the key exerts on the roller the restrictions, which can break it. The object of the present invention is a roller assembly that remedies these drawbacks of the previous branch. It must allow both effective centering and entrapment of the rod by the ferrules. It must also allow axially retaining the ferrule in relation to the roller. These objects are achieved by the fact that the means for connecting the endpiece and the roller in rotation and for retaining axially the endpiece relative to the roller are able to compensate for the differential thermal expansion of the endpiece relative to the roller at the elevated temperature, and by the fact that these means are different and independent of the means for centering the roller in relation to the tip. Thanks to this characteristic, the centering of the roller relative to the end piece can be ensured by elastic elements, for example, spring plates or bimetallic elements. These elements do not ensure the transmission of the pair. For this reason it is not necessary to achieve a high contact pressure between the elements and the end of the roller on the one hand, between the elements and the end piece on the other hand. This results from the fact that the weight of the roller and the load it supports are not very important. Of this fact, the radial stresses necessary for the centering are unimportant, of the order of ten to twenty times lower than the efforts required to ensure the entrapment in rotation of the roller by rubbing only. In addition, despite the high temperature and the drop of the elastocity module involved, the centering can be independently assured effectively. The fact that the rotary trapping means are able to compensate for the expansion of the ferrule prevents a relative rotation of the ferrule relative to the high temperature roller. This eliminates the risk of destroying the roller when the endpiece returns to its initial temperature. According to a variant embodiment, the means for centering the roller in relation to the ferrule are composed of bimetallic longitudinal or radial elements. According to a second variant of relation, the means for centering the roller relative to the end piece are constituted by longitudinal or radial elastic elements. According to another variant of embodiment, the means for connecting the endpiece and the roller in rotation and for axially retaining the endpiece with respect to the roller are constituted by a bimetallic sheet fixed to the endpiece and applied on the plane of the end. of the roller. Still in accordance with another embodiment, the means for connecting the endpiece and the roller in rotation and for axially retaining the endpiece relative to the roller are constituted by a key fixed to the endpiece and applied by an elastic means on a plane of the end. of the roller. Finally, according to a variant embodiment, the means for connecting the endpiece and the roller in rotation and for axially retaining the endpiece with respect to the roller are constituted by a pin that penetrates the housing made at the end of the roller. Other features of the invention will appear even after reading the following description of examples of embodiments given by way of illustration with reference to the appended drawings. In these drawings. Figure 1 is a view of the end of a roller assembly according to the invention; Figure 2 is a detailed view of a first variant embodiment of the centering means; Figure 3 is a detailed view of a second variant embodiment of the centering means; Figure 4 is a detailed view of a first variant embodiment of the rotary link means of the roller and the ferrule. Figure 5 is a detailed view of a second variant embodiment of the rotary link means of the roller and the ferrule. Figure 6 is a detailed view of a third variant embodiment of the rotary link means of the roller and the tip. The roller assembly shown in FIG. 1 is constituted by a part of a ceramic roller 2, generally vitreous silica, and of two metal ferrules 4, mounted on each end of the roller 2. A single ferrule 4 is shown in figure 1. The roller 2 comprises a cylindrical part on which a load is transported, for example, sheets of glass, and two ends 6, in addition to small diameter, on which the ends 4 are mounted. The roller 1 is mounted by rotating the conventional shaft around its longitudinal axis XX. The centering elements 10 are interposed between the endpiece 4 and the end 6 of the roller 2. On the other hand, the elements 12 of rotation linkage of the roller 2 and the conter 4 are also provided. The centering elements 10 are distinct and independent of the rotating link elements of the roller 2 and the endpiece 4, as can be seen in FIG. 1. In FIG. 2, a first variant of the elements of FIG. centered. They are constituted by three bimetallic elements 14 arranged circumferentially around the end of the roller 2 to 120Q one of the other. These elements are constituted by two metals that have different thermal di? Etation coefficients. Its curvature increases with the temperature, which makes it possible to compensate the differential expansion of the endpiece 4 and of the roller 2. The bimetallic elements of this type are described in EP 0 574 278. The struts 15 s stop the elements 14 Figure 3 shows a second variant of the centering elements. They are constituted by helical coil springs 16, analogous to those described in document E 0 615 960. In FIG. 4 a variant of the elements of trapping in rotation of the roller 2 by the endpiece 4 is shown. it is fixed to the end piece 4 by means of a screw 20. The sheet 18 can be an elastic or bimetallic sheet. S is applied on the plane 22 formed on the end 6 of the roller 2. The sheet thus ensures in rotation connection d the endpiece 4 and the roller 2. In addition, the nacho of the plane corresponds to that of the sheet of such so that the endpiece 4 is also locked according to the direction XX of the longitudinal axis of the roller 2. The sheet thus ensures two functions simultaneously. The elasticity of the sheet 18 makes it possible to compensate for the dilation of the end piece in such a way that its ends are applied against the plane 22, even at an elevated temperature. In FIG. 5 a second variant of the elements for trapping the roller 2 by the endpiece 4 is shown in rotation. A key 24 is held in rotation by a shaft 26 screwed into the end piece. The key can slide freely on the axis 26. An elastic washer or a spring 27 is inserted between the ferrule and the key. The spring washer allows to accommodate the differential expansion of the end piece. In a manner similar to what was described with reference to the figure, the chabeta is applied on a plane or curved surface 28 of the end 6 of the roller 2. The key is also longitudinally bisected so as to immobilize the endpiece 4 relative to the There is shown in FIG. 6 a third variant of the elements of the rotary entrapment of the roller 2 by the end piece 4. A simple pin 30For example, an expansion pin ensures the two functions of rotating and connecting link in accordance with the XX direction. When the end is expanded, the pin remains attached to the roller in such a way that no pinch can be produced. rotation of the ferrule in relation to the roller. It is thus ascertained that, in the invention, contrary to the known devices, the centering elements shown in FIGS. 2 and 3 only ensure the centering of the endpiece 4 relative to the roller 2. The linking functions in rotation and liaison in accordance with address XX are independently secured by another inde pendent element, for example, those described, by way of illustration and in no way limiting with reference to figures 4 to 6. Due to the fact If the centering elements in Figures 2 and 3 (9 or other centering elements) should only ensure the centering function, the drop in the modulus of elasticity of materials at elevated temperature is not harmful because, as explained above, the weight of the roller and the load it supports are not very important, due to this fact, the radial efforts necessary for the centering are not very important, of the order of It is twenty times lower than the forces required to ensure the entrapment in rotation of the roller 2. As an example, a radial effort of 5 kg. it is sufficient to ensure the centering of a roller for which an effort of 100 kg would be necessary, if it were equally desired to trap the roller 2 by the sole effect of the rubbing forces. It is also noted that in the set of described embodiments, the locking in rotation and in translation in accordance with the axis of the roller are not ensured by the frictional force, but by supports on the incxined surfaces in relation to the circle centered on the axis of the roller and what passes through the point of contact die roll and the means of locking in rotation.

Claims

CLAIMS:

1. - Roller assembly for transporting articles at elevated temperature, comprising: a ceramic roller comprising a longitudinal axis and comprising two extremities; at least one metallic end piece with a generally cylindrical shape, mounted at least at one end of the roller; elements, interposed between the end of the roller and the end, for ligating the endpiece and the roller in rotation, to axially retain the endpiece relative to the roller, and to center the roller in relation to the endpiece, characterized in that the elements for ligating the endpiece and the roller in rotation and to axially retain the endpiece with respect to the roller are layers capable of compensating the differential thermal expansion of the endpiece relative to the roller at the temperature the ford, and by the fact that these elements are distinct from each other. and independent of the elements to center the roller in relation to the tip.

2. The roller assembly according to claim 1, characterized in that the elements for centering the roller relative to the end piece are constituted by bimetallic longitudinal or radial elements.

3. - The roller assembly according to claim 1, characterized in that the elements for centering the roller relative to the tip are constituted by longitudinal or radial elastic elements.

4. The roller assembly according to any of claims 1 to 3, characterized in that the elemejts to link the endpiece and the roller in rotation and to axially retain the endpiece relative to the roller are constituted by a elastic sheet, especially bimetallic, fixed to the tip and applied on a plane of the end of the knee

5. - The roller assembly according to any of claims 1 to 3, characterized in that the elemejts to link the endpiece and the roller in rotation and to axially retain the endpiece relative to the roller, are constituted Dor a key fixed to the tip and applied by elastic elements on a surface of the end of the roller.

6. The roller assembly according to any of the reividuals 4 and 5, characterized in that the plane p see a width corresponding to that of the key or the elastic sheet. 1 . - the roller assembly in accordance with any of the properties 1 to 3, characterized in that the elements for linking the endpiece and the roller in rotation and for axially retaining the endpiece in relation to the coridllo are constituted by a pin that penetrates into a housing practiced at the tip of the roller.