DK144221B - INSTALLATION FOR HEAT TREATMENT OF SPECIFIC POROESE CYLINDERS AND Pipes - Google Patents

Description

(19) DENMARK (¾

® (12) IMMEDIATE WRITING NOW 144221 B

DIRECTORATE OF THE PATENT AND TRADEMARKET SYSTEM

(21) Application No. ^ 24l / 76 (51) IntCI.3 F 27 D 3/12

(22) Filing day Sep 21 1976 F 27 B 9 / 2A

(24) Running day Sep 21 1976 B 65 G 35/02 (41) Aim. available Mar 23 1977 (44) Posted Jan 18 1982 (86) International application no.

(86) International filing day (85) Continuation day - (62) Master application no. -

(30) Priority Sep 22 1975 * 7528925, FR

(71) Applicant SAINT-GOBAIN INDUSTRIES, F 92209 Neuilly sur Seine, FR.

(72) Inventor Aldo Ricci, IT: Nedo Passerini, IT.

(74) Clerk of the International Patent Office.

(54) Installations for heat treatment of especially porous cylinders and pipes.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a heat treatment plant, in particular porous cylinders Qg tubes, comprising a chamber with a cover, designed with a vent, with four pairs of opposite side walls and a bottom, as well as an entrance opening located in one side wall of the cover for the pipes to be is treated, and an outlet opening located in the opposite side wall at the bottom of the treated tubes, as well as a plurality of (Q) the interior of the chamber, mutually parallel, movable T "" * CM plates on which the tubes are successively caused to roll by g | of transport means in the form of endless chains with rt engages with each tube.

It is known per se to heat treat various ingenious stands to pass these objects through an oven where the articles perform a translational movement and, if cylindrical, also roll about their longitudinal axis on a heated substrate. eg. a hot plate.

For this dual translation and rotational movement, it is known per se to use endless chains of transport carriers that push the objects through the furnace.

When such heat treatment is to be carried out on tubes of fibrous material, e.g. In particular, insulating shells of fibrous material impregnated with binder, for example as disclosed in FR Patent Application No. 74.17232, encounter particular difficulties.

At the beginning of the heat treatment, the resin impregnated pipes are very vulnerable. In the initial phase of the heat treatment, they can be easily deformed before the heat treatment causes a certain surface hardening, especially because the transport carriers mechanically affect the pipes at a time when the hardening has not yet begun. In addition, the use of a heating plate on which the tubes roll about themselves has the disadvantage that there is a highly concentrated local heat effect which is not particularly suitable for curing the tubes.

The invention provides a facility which allows for a more gentle handling of the pipes and a more comprehensive curing / treatment of these pipes.

To this end, a plant according to the invention is characterized in that the plates are unheated and perforated, that the preferably rod-shaped carriers are arranged such that the distance between the plates and the place where the drivers engage the pipes is at most equal to the radius of the pipes, and below the bottom there are a number of gas burners covered by wall elements, the bottom between the wall elements being pierced and preferably covered with a grating.

By using carriers in the embodiment defined herein, one obtains the result that the pushing force exerted by a carrier on a tube produces a component parallel to the associated plate, i.e. a transport component, and an upward component which contributes to appropriate and gentle rolling of the tube on the plate, especially during the initial phase of processing. The use of unheated, perforated plates and gas burners at the bottom of the chamber provides a better distribution of heat that is no longer located at the bottom of the pipe, and since the plates are perforated, faster surface hardening is also achieved, with the resultant less soiling of the plates. with the binder. In addition, it is mechanically simpler to use perforated plates and separate gas burners, because it is no longer necessary to supply heat fluids to the plates or heat them separately.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is explained in greater detail below with reference to the schematic drawing, in which: Fig. 1 is a side view of the chamber and partly in section; 2 is a detailed view of the mechanism for transporting and rotating the objects in the chamber; FIG. 3 is an enlarged longitudinal section through the drive mechanism of the chamber of FIG. 1, and FIG. 4 and 5 are longitudinal sections through portions of two embodiments of the drive mechanism of the chamber of FIG. First

The described embodiment illustrates the use of the plant speech processing of insulating shells A of felt material mixed with binder, especially shells of the kind disclosed in the above-mentioned patent application. The plant is intended to perform a complete and uniform heat treatment of the shells for polymerization or curing of the binder.

During the heat treatment in the heater, the shells are transported without external influence to prevent the outer layers from separating and to create surface defects that could damage the appearance of the shells.

During their stay in the heat furnace, the shells are kept lying all their length, and they are made to rotate completely around their axis for a uniform heat treatment.

The shells A are individually fed to an input flap 1 which is actuated by a pressure cylinder 2 and stops the individual shells before they are inserted. The opening of the limb is time controlled and of limited duration to limit the heat losses from the furnace.

In order to extend the stay of the shells in the oven and at the same time limit the length of the oven, the oven is designed with several floors, namely five floors in the illustrated embodiment.

Each floor is formed by a perforated plate consisting of one or more parts, over which the shells A are caused to roll as they are propelled by means of rods 4 which carry out a continuous translational movement. For this purpose, chains 5 connected to the rods are used. According to the invention, the arrangement is such that the upper branch of such an endless chain 5 causes a translation movement in one direction on one floor, while the lower branch on the same chain causes a translation in opposite direction 4 144221 on the floor below.

In the described embodiment, there are three chains 5 with rods 4 to achieve five floors above each other. The chains are driven by a motor variator through a chain with a sprocket 6.

The shells A are deposited on the perforated plates 3 between the successive rods 4. The movement of the endless chain 5 causes the rods 4 to move forward and push the present shell A, which rolls forward on the support plate 3. Between the end 9 of the respective plate 3 and in the last rod before the sprocket 6 there is provided a space through which the shells A can fall to the floor below. On this floor, the rods run in the opposite direction and with the receding branch of the chain. In this way, the shells will again be transported horizontally in the opposite direction to the immediately above floor. Eventually, the shells exit from the lower floor over an inclined plane 10.

The heater is heated by means of gas burners 12 arranged on the floor 13 of the furnace. Above the gas burners, stainless steel wall elements 14 are provided to avoid local overheating on the lower floor of the heater. A uniform distribution of the rising hot air throughout the height of the furnace is ensured by a thin, perforated plate 15 extending parallel to and spaced from the upper side of the wall elements 14.

After coating all the shells, the air is discharged through a chimney 16.

The example described and illustrated applies to the case where the plates 3 carrying the shells A to be treated are horizontal.

In the FIG. 4 and 5, the plates have a slope relative to the horizontal.

As shown in FIG. 4, the plate 3 has an upward slope in the direction of movement of the shells A which are conveyed by means of the rods 4.

Such an embodiment provides a regular rotation of the shells, although their rotation should not be perfect.

According to FIG. 5, the plate 3 has a downward slope in the direction of movement of the shells A. These shells are driven by gravity, in which case the rods 4 retain the shells. In addition to the one shown in FIG. 4, such an arrangement of the plate 3 gives the advantage of a better spring.