EP0049929A2 - Press roller for an extrusion machine for agricultural use - Google Patents

Abstract

The invention consists essentially in producing the working sleeve of the press roller in two distinct parts, namely an inner part (2) fixed permanently to the usual bearings (3, 4), and an outer part (1) which is added to the first so as to be capable of being easily replaced after wear. <IMAGE>

Description

The subject of the present invention is a pressure cylinder for extrusion machines for agricultural use, the originality of which resides in the fact that the working sleeve is produced in two parts so that the external part corresponding to the working surface. of the cylinder is thus made interchangeable, while the inner part which cooperates with the bearings or bearings supporting the envisaged cylinder remains permanently mounted thereon.

It is known that the extrusion machines currently used for the production of both mash and other agricultural products are equipped with rotating pressure cylinders which ensure the extrusion of the material through the perforations of a cylindrical die.

These pressure cylinders are provided with a working sleeve hollowed out with grooves oriented along its generatrices so that during its rotation said sleeve grasps the material and repels it in order to compress it against the internal surface of the above-mentioned die. .

It is understood that these cylinders wear relatively quickly and must therefore be frequently replaced without it being possible to recover the sleeves; there is a need to consider a delicate and costly operation to dismantle the tapered roller bearings from the worn sleeve and to mount a new sleeve thereon.

According to the present invention, on the contrary, provision is made for the covering sleeve of the pressure cylinder to be made in two parts or layers, namely an inner part which is never replaced because it is not subjected to any wear, and an outer lining which on the other hand can be easily dismantled by cutting it along two generators, advantageously provided grooved in order to facilitate cutting, and to be replaced by a new part capable of being easily brought back into place, for example hot in order to operate a slight expansion which allows engagement without particularly expensive tools.

The subsequent cooling of the outer part of the sleeve automatically ensures perfect retention of the latter on the inner part.

• Fig. 1 est une vue en élévation avec coupe partielle montrant un cylindre de pression établi conformément à l'invention.
• Fig. 2 est la vue de côté correspondante, le plan de coupe partielle de fig. 1 ayant été indiqué en I-I.
• Fig. 3 montre de la même manière que fig. 1 le manchon à l'état séparé.
• Fig. 4 est une vue de côté de ce manchon dans laquelle on a indiqué en III-III le plan de coupe partielle correspondant à fig. 3

The appended drawing, given by way of example, will allow a better understanding of the invention.

• Fig. 1 is an elevational view in partial section showing a pressure cylinder established in accordance with the invention.
• Fig. 2 is the corresponding side view, the partial section plane of FIG. 1 having been indicated in II.
• Fig. 3 shows in the same way as fig. 1 the sleeve in the separate state.
• Fig. 4 is a side view of this sleeve in which the partial section plane corresponding to FIG. 3 has been indicated in III. 3

As particularly visible in fig. 1 and 2, the pressure cylinder shown comprises a sleeve in two parts 1 and 2, mounted by means of conical roller bearings 3 and 4 on the shaft 5 which is intended to be attached to the extrusion machine at by means of an elastically deformable seal 6.

The outer part or lining 1 of the sleeve has surface grooves 7 arranged in a series of generatrices close to each other in order to ensure a good grip on the material to be worked.

We understand that following the realization of the sleeve in two parts, we are able to replace the worn outer part with a new part, simply by cutting this outer part 1 along two opposite generatrices corresponding to two grooves 8 and 9 (fig. 4) and by installing the new part by hot mounting, this way of proceeding ensuring perfect retention of the two parts while facilitating the work.

In the embodiment considered it has been assumed that the grooves 8 and 9 were provided on the outer wall of the inner part 2 of the sleeve but it goes without saying that the arrangement can be reversed, said grooves then being formed on the inner wall of the outer part 1, despite a cost which may be slightly higher.

Similarly, any other means, in particular mechanical, can be used to secure the outer part 1 to the inner part 2.

In any case, it can be seen that the ease of replacing the external part 1 makes it possible to substantially reduce the labor station involved in the maintenance of machines of the type envisaged.

Claims (4)

1. Pressure cylinder for extrusion machines for agricultural use, characterized in that its working sleeve is made in two parts, namely an outer part (1) having the grooves (7) necessary for good work of the material to be treated and an inner part (2) mounted on the support pads, said outer part (1) thus being capable of being easily replaced when it is worn. 2. Pressure cylinder according to claim 1, characterized in that the inner part (2) has two grooves (8 and 9) provided along two generators to facilitate cutting of the outer part (1) for replacement. 3. Pressure cylinder according to claim 1, characterized in that the outer part (1) has on its inner wall two grooves provided along two generators to facilitate its cutting for replacement. 4. Pressure cylinder according to any one of the preceding claims, characterized in that the fixing of the outer part (1) on the inner part (2) of the sleeve is ensured by hot mounting.

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