CS209875B2 - Device for the heat processing of generated particularly porous objects - Google Patents

Abstract

1534597 Endless conveyers SAINT-GOBAIN INDUSTRIES 16 Sept 1976 [22 Sept 1975] 38370/76 Heading B8A Workpieces A, e.g. tubes, are conveyed through a hot gas heat-treatment zone at successive levels and in successive opposite directions, the workpieces being rolled the while about axes normal to their direction of movement. As shown the tubes are rolled along perforated plates 3 by bars 4 carried between a pair of endless chains 5. The upper and lower runs of the chains are used to convey the tubes in successive different directions. Transfer between the upper and lower runs and from one conveyer to the next is by gravity. The plates 3 may be inclined to the horizontal (Figs. 4 and 5, not shown). A particular application described is the heating of resin bonded fibrous shells in a gas-fired oven in order to harden the resin (Fig. 1, not shown).

Description

The invention relates to a device for the heat treatment of rolling, in particular porous objects, such as cylinders or tubes, with a housing having a hood provided with a take-off cover, four counterparts each with two standing siderails and a bottom. on the opposite side wall at the bottom there is an outlet opening for the articles to be processed, with a plurality of parallel, stationary, inside the housing provided with plates for supporting the articles and with a conveyor device consisting of endless chains and grippers placed thereon.

The device according to the invention makes it possible to achieve a homogeneous and efficient processing of the articles when reducing the dimensions of the housing, in particular in the direction of movement of the articles.

In such a device, the objects extend several times along the length of the casing and roll on top of each other on flat surfaces arranged transversely of the casing while being in contact with the grippers, which are subjected to continuous sliding movement and ensure gradual passage of the workpieces in one sense. and then in the second sense of movement in two different height steps.

The workpieces are generally cylindrical, spherical or ovoid and are rotated about their axis or about their center.

The workpieces may be formed as fibrous products, in particular as corrugated insulating tubes in which the binder is dispersed between the fibers, the gases contained in the housing causing a thermal effect over the entire thickness of the workpieces, polymerizing or curing the binder. These articles may, for example, consist of fibrous insulating tubes, in particular of small diameter, made of a felt in which the binder is dispersed, the tubes having a permeable style and an internal and external glazed and smooth surface.

Good control of the melting of the binder of the treated fiber articles is important, and the heat treatment is to be applied gradually over the entire thickness of the articles from their entry into the housing to their exit. Existing facilities have only partially complied with this requirement.

The above mentioned drawbacks are eliminated by a device for the heat treatment of rolling, in particular porous objects, such as cylinders or tubes, with a housing having a hood provided with a take-off cover, four against each other two

20987S standing siderail as well as the bottom, with an inlet opening on one side of the cover and an outlet opening for the workpieces on the opposite sideboard at the bottom, with a plurality of parallel, immovable, inside the housing of the object support plates and the conveyor; according to the invention, characterized in that the plates are perforated and there are grips running across them, for example in the form of bars, the distance between the plates and the contact points of the carriers with the workpieces being at most equal to their of the radius below the bottom are gas burners, covered by cover deflectors, the bottom outside the deflectors being perforated and for example covered by a grille.

The invention allows heat treatment of articles passing through the housing, while controlling their structure by controlling the formation of hot gases in the lower part of the housing and near the last level of workpieces.

1 shows a plan view of a device with partial vertical section, FIG. 2 shows a perspective view of a device for rotating and sliding objects in a housing, FIG. 3 shows a longitudinal section of a device for moving workpieces; 1 in an enlarged scale, FIG. 5 shows partial longitudinal sections of two embodiments of the apparatus for moving the workpieces.

The workpieces A are fibrous insulating tubes made of felt in which the binder is dispersed. The device according to the invention serves to completely and uniformly burn these tubes while achieving polymerization or curing of the binder.

The objects to be processed A are moved in the casing during firing in such a way that the outer layers do not peel off and damage their surface, which would impair their appearance. In addition, while in the cabinet, the workpieces A are perfectly kept straight over their entire length and perform rotary movements about their axes so that their firing is uniform.

The workpieces A are successively fed to the door 1, which is moved by the work roller 2, which stops each workpiece A before it enters the housing. The opening of the door is time-controlled and the opening time of the door 1 is limited in order to reduce the heat loss in the housing.

In order to extend the residence time of the workpieces A in the cabinet without increasing the length of the cabinet, the cabinet has a plurality of elevations, five of which are arranged one above the other.

Each stage consists of a plate 3 perforated in one or more of its parts.

The workpieces A are rolled on the plate 3 and are moved by the grippers 4, which are designed as rods and perform a continuous sliding movement. For this purpose, chains 5 are rigidly connected to the grippers 4.

The device according to the invention operates in such a way that one of these chains 5 causes its ionic strand to move the carriers 4 in one sense and then its lower strand in the other sense on two perforated plates 3 'in succession.

In the present example, three chains 5 provided with grippers 4 are arranged to form five superimposed stages. The chains 5 are driven by a chain engaging the end pinion 6, a motor with a variator.

The workpieces A are deposited on the perforated plates 3 between successive grippers 4. As the endless chain 5 moves, the grippers 4 move. Each of the workpieces A is pushed by the gripper 4 'located just behind it and the workpiece A rolls on the perforated plate 3. Between the end 9 of the perforated plate 3 and the last gripper 4, there is a free space 7 in front of the pinion 6 · Object A from upper to lower. At this stage, the grippers 4 move in the opposite direction as they are driven backward by the larger endless chain 5. This results in the workpieces A being subjected, under the same conditions, to a new horizontal movement in the sense opposite to objects And just passed. The workpieces A finally protrude from the bottom plate 8 and roll on an inclined plane 10o.

Heating of the housing is effected by gas burners 12 located on the housing bottom 13 above which small stainless steel deflectors 14 are arranged, in order to prevent local overheating of the lower stage of the housing. The regular distribution of hot rising air over the entire height of the housing is achieved by using a thin perforated sheet 15 parallel to the top of the deflectors 14 and spaced from these deflectors 14.

The air which comes into contact with all the workpieces A exits through the chimney 18.

DESCRIPTION OF THE PREFERRED EMBODIMENT The cabinets shown in FIGS. 1 to 3 refer to the case in which the perforated plates 3 supporting the workpieces A are placed horizontally.

In the embodiment shown in Figures 4 and 5, these perforated plates 3 are inclined with respect to. horizontal plane.

The inclination of the perforated plates 3 is, as shown in FIG. 4, ascending in the sense of the movement of the workpieces A, with the grippers 4 in contact with the workpieces.

And, they cause their movement.

Such an embodiment allows for a regular rotational movement of the workpieces A, although the rotational shape of the workpieces A is not perfect.

As shown in FIG. 5, the perforated plate 3 tends to descend in the sense of the movement of the workpieces A which move under their weight and the brakes 4 in this case stop them. In addition to the advantage of FIG. 4, the arrangement of FIG. 5 facilitates removal of material particles that could peel off from the workpieces A as they pass through the housing.

The carriers 4 are positioned on the plates 3, 8 such that the distance between the plates 3, 8 and the contact points of the carriers 4 with the workpieces A is at most equal to the radius of these articles.

Claims (1)

SUBJECT Equipment for the heat treatment of rolling, in particular porous objects, such as rollers or tubes, with a housing having a hood provided with a take-off cover, four opposing faces each side and a bottom, with an inlet opening on one side of the cover; on the opposite side wall at the bottom there is an outlet for workpieces having a plurality of parallel, stationary, inside the housing provided with boards for supporting the articles and with a conveyor device consisting of endless chains and an invention of the sieves disposed thereon, 8] are perforated and transverse grips (4), for example as rods, run across them, the distance between the plate (3, 8} and the gripping points (4) with the workpieces (A) is at most equal to their radius; burners (12), covered by cover deflectors (14), wherein dn o the deflectors are perforated and are, for example, covered with a grille (15).