FI63484B - ANORDNING FOER VAERMEBEHANDLING AV SAERSKILT POROESA CYLINDRAROCH ROER - Google Patents

Description

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Patani och ragiatarityralaan At least utkgd och wSgitoi pibunwj ^ g q2 g ^ (32) (33) (31) F ^ ydwy «ueUMm-UiIrd rtokit 22.09 75 France-France (FR) 7528925 (71) Saint-Gobain Industries, 62, Bd Victor-Hugo, 92209 Neuilly sur Seine, France-France (FR) (72) Aido Ricci, Treviglio (Bergamo), Nedo Passerini, Caravaggio (Bergamo), Italy-Italy (lT) (7¾) Berggren Oy Ab (5¾) Device The present invention relates in particular to an apparatus for the heat treatment of porous cylinders and tubes, in particular a chamber having a roof with a roof formed together with a discharge hose, four pairs of opposite sides a roof inlet for the pipes to be treated and an outlet for the treated pipes in the opposite side wall at the bottom, as well as a number of parallel fixed plates in the chamber, over which the tubes are gradually rolled by means of conveyor members consisting of endless chains each having cavities adhering to its own tube.

It is known per se to dry porous tubular bodies, such as hollow straw cylinders or tubes made of cellulose, in a heat chamber. Thus, F1 Patent 13,014 discloses an apparatus for drying hollow straw cylinders, the apparatus comprising a chamber in which drying air circulates and having an inclined plane supporting the straw cylinders, along which the cylinders can roll under their own weight. Drying is carried out periodically by filling the chamber with straw cylinders and, as the cylinder at the lower end of the inclined plane 2 634 8 4 has dried, it is removed and a new cylinder is fed to the upper end of the inclined plane.

U.S. Patent No. 1,322,813 discloses a continuous apparatus for drying fibrous tubes. The device comprises a heat chamber with an endless pair of chains moving in a plurality of superimposed planes alternately in opposite directions. Rollers are arranged between the pair of chains, which rotate on a fixed base and in turn rotate the fiber tube supported by the two rolls in each case. The second endless pair of chains is adapted to feed the fiber tubes to be dried into the chamber and to remove the dried tubes.

Also for drying or heat treatment of other types of goods, such as fresh fodder or metal objects, it is known to transport the goods alternately back and forth along superimposed, heated or unheated levels through the chamber or shaft, while hot air is blown through the chamber or shaft. Such devices are disclosed in DE-A-1,108,149 and 1,177,667 and in U.S. Pat. No. 2,451,053.

The object of the present invention is to provide a device for the heat treatment of porous cylinders and pipes in particular, which device enables efficient heat treatment of the pipes while minimizing the mechanical stresses on the pipes.

The device according to the invention is characterized in that the plates are unheated and perforated, that the rod-shaped cavities are preferably arranged so that the distance between the plates and the point where the cavities touch the pipes is at most equal to the pipe radius and that there are several gas burners under the base. , which are covered by wall elements, the base between the wall elements being perforated and preferably covered by a grating.

The device according to the invention can be applied to a wide range of treatments, such as drying, roasting, cooling, heating, and to functions such as annealing, discharging and the like. It can also be used to coat the surface of bodies with substances such as coatings, paints, etc., which may be heterogeneous in composition and whose ingredients are effectively mixed during the movements to which the bodies are placed. It can also be used to facilitate the coating of pieces with semi-rigid, flexible or shrinkable coatings.

The bodies to be treated may be in the form of a tube, in particular in the form of a cylindrical tube. They can be, in particular, fibrous products, in particular insulating fibrous shells in which a binder is applied between the fibers, the gases in the chamber providing a heat treatment over the entire thickness of the products, so that the binder is polymerized. These products can be, for example, fibrous insulating shells, in particular of small diameter, disclosed in French patent application 74 17232, formed of a felt in which a binder has been dispersed, and having a permeable structure comprising a hardened and smooth inner and outer surface.

Other features and advantages of the invention will become apparent from the following description of an embodiment of the invention, given by way of non-limiting example.

During the explanation, reference is made to the accompanying drawing, in which:

Fig. 1 shows the chamber in a vertical view with parts broken away, Fig. 2 is a detailed view of the device for transporting and scrolling pieces inside the chamber, Fig. 3 is a longitudinal sectional view, on a larger scale, of the chamber transport device embodiment.

The example shown relates to the application of the device to fibrous insulating shells A formed of a felt in which a binder has been dispersed, in particular of the type described in the above-mentioned French patent application. The purpose of this device is to perform a complete and uniform roasting of the shells, causing the binder to polymerize, i.e. cure.

During roasting, in the chamber, i.e. the oven, the shells are forcibly transported so as to avoid delamination of the outer layers and the formation of surface defects which degrade the appearance. On the other hand, during their residence in the oven, the shells are kept 4 6 3 4 8 4 completely along their length so that they make perfect revolutions around their center line, harmonizing the roasting.

The shells A are successively brought in front of the door 1, which is moved by a power device 2, which stops each shell before entering it. The opening of this door is timed and limited to reduce heat loss in the oven.

In order to prolong the residence time of the shells in the oven while limiting the length of the oven, the oven comprises several coated levels, the number of which in the example shown is five.

Each of these planes is formed by a perforated plate 3, in one or more parts, on which the shells A are made to roll by conveying them by means of rods 4 running in a continuous displacement. To this end, there are chains 5 attached to said rods. The arrangement according to the invention is such that each of these endless chains 5 performs at its upstream transfer in one direction and then at its downstream in the other direction, in two successive perforated plate layers 3.

In the example in question, there are three chains 5 provided with rods 4 to provide five overlapping planes. The chains are driven by a speed-controlled motor on the end sprockets 6 via a sling chain.

The shells A are lowered onto the torn plates 3 between two successive bars 4. The displacement of the endless chain 5 causes the rods 4 to advance. Each shell A is pushed by the bar immediately upstream of it and advances along the rolling support plate 3. Between the end 9 of the perforated plate in question and the last rod, there is a free space 7 in front of the sprocket 6, through which the shell A can move to a lower level due to gravity.

At this level, the rods travel in the opposite direction because they are carried by the return run of the endless chain. It follows that, under the same conditions, the molds have to re-run horizontally in the opposite direction to where they have traveled mainly at the upper level. The shells finally leave the lowest level 8, rolling down to a sloping level of 10.

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The heating of the furnace is carried out by gas burners 12 placed on the furnace floor 13 and above which small non-oxidizing metal vaults 14 are arranged to avoid local overheating on the lower level of the furnace. The distribution of the hot air rising to the full height of the furnace is evenly carried out by means of a thin perforated plate 15 parallel to the top of the vaults 14 and located at some distance from them.

Once the air has passed through, in contact with all the shells, it exits through the flue 16.

The example described above and shown in the drawing relates to the case where the plates supporting the pieces A to be treated are in a horizontal position.

In the embodiment according to Figures 4 and 5, these plates are inclined with respect to the horizontal.

According to Fig. 4, the inclination of the plate 3 is increasing in the direction of travel of the pieces A, whereby the bars 4 with which the pieces are in contact carry them.

This embodiment ensures that the bodies rotate regularly even if the shape of the rotation of the bodies is incomplete.

In the embodiment according to Figure 5, the inclination of the plate 3 is decreasing in the direction of travel of the pieces A. The pieces are carried by gravity, and in this case the rods 4 regulate the movement of the pieces. In addition to the advantage mentioned above in connection with Fig. 4, such an arrangement of the plate 3 facilitates the removal of any particles of material which may have come off the pieces A as they pass in the treatment comb.

Claims (1)

Apparatus for heat treating porous cylinders and pipes in particular, comprising a chamber with a roof formed by an outlet horn (16), four pairs of opposite side walls and a bottom, and an inlet in one side wall near the roof for the pipes to be treated and in the opposite side wall at the bottom an outlet for the treated pipes, and a plurality of parallel, fixed plates in the chamber, over which the pipes are gradually rolled by means of conveyor members consisting of endless chains each having cavities adhering to its own pipe, characterized in that the plates (3, 8) are unheated and perforated, that the rod-shaped recesses (4) are preferably arranged so that the distance between the plates (3, 8) and the point where the recesses (4) contact the pipes (A) is at most equal to the radius of the pipe, and that the bottom below are several gas burners (12) which are part of the wall elements (14) covered, the base between the wall elements (14) being perforated and preferably covered by a grating (15). Anordning for varnish handling in the case of a cylindrical cylinder, in which case a chamber with a cylinder is used, and in the case of a chamber with a cylinder, and in the case of a cylinder of the same type of belt en i den motstäende sidoväggen vid bottnen belägen utloppsöppning för de behandlade rören, samt ett antal i kammaren belgie, inbördes parallella, stationära plätar, pä vilka rören rör, kännetecknad av att plätarna (3, 8) är ouppvärmda och perforerade, att de företrädesvis stav-formiga medbringarna (4) är aordnade, att avänänen mit plätarna (3, 8) och det ställe, där medbringarna (4) st & r the contact with the rope (A) is not too dirty with the rake, and with the detector under the glass element (12), nten (14) is genomic and has been shown to have ginger (15).