ITRE20090116A1 - PROTECTION DEVICE FOR BELTS, CHAINS OR SIMILAR TRANSPORT, AND FOR THE RECOVERY OF FLUIDS AS FOR EXAMPLE SMALTI, PAINT OR RESINS, APPLIED TO VELATRICE, BELL OR SIMILAR - Google Patents

Description

`` PROTECTION DEVICE FOR BELTS, CHAINS OR SIMILAR MEANS OF TRANSPORT, AND FOR THE RECOVERY OF FLUIDS, SUCH AS ENAMELS, PAINTS OR RESINS, APPLIED TO A SAILING MACHINE, BELL OR SIMILAR ...

The following invention finds application, among other things, in the field of ceramic tile manufacturing and more particularly in the glazing process. The main function of the invention is to avoid contact between the various types of enamel used and the belts or other transport members, in order to reduce their waste and facilitate their recovery. It can be combined with the use of booths, glazing machines or other methods of spreading the glaze, but the most significant advantages are obtained by combining it with a glazing machine or die. The glazing machine is a machine that is introduced into the glazing line to apply a thin layer of glaze on the tiles (engobes, slips, crystallines, etc.); in fact it produces a veil of enamel, orthogonal to the transport surface, with a maximum thickness of a few millimeters and the tile, transported by the belts, is enhanced by it as it passes through it. The operating principle of the ENAMEL RECOVERY DEVICE is as simple as it is effective: a mechanism allows a barrier to emerge alternately between one tile and another, from under the transport belts so as to divert the veil of glaze and avoid contact with the belts themselves which remain clean. The invention proposes the solution of numerous problems connected with the use of a glazing machine, and in order to understand them better, it is advisable to go into details.

Basically we can summarize two methods for glazing with a glazing machine, characterized by the type of transport of the tiles they adopt:

1. Continuous towing (fig.l);

2. Interrupted towing (fig. 2).

Both methods objectively present important shortcomings.

1. Continuous towing has been replaced by many ceramic industries with discontinued towing for the following reasons:

â € ¢ The veil of glaze, generated by the glazing machine, comes into contact not only with the tiles, but also with the transport belts, which take away a considerable amount of glaze. The latter will be recovered in large part by means of special scrapers, which in any case let through a quantity of glaze which will be lost in several points of the transport by dripping. â € ¢ the belts before, and also after, being scraped transmit the glaze to the other moving parts with a consequent reduction in the efficiency and duration of the parts involved, and nevertheless dirty the tiles underneath, creating further problems for the subsequent cooking department. â € ¢ The enamel â € œdrawnâ € from the belts, before being recycled, is generally pumped into a vibrating sieve, to eliminate impurities, and then the cycle ends in the original container. This step also creates problems, as the glaze in its return path traps small bubbles of air, which when they arrive on the tile translate into a hole called “egg” in jargon. The latter completely compromises the piece that hosts it, obviously increasing the percentage of production waste.

2. The interrupted towing method, on the other hand, solves the problems referred to in point 1 to the disadvantage, however, of the drafting quality; In fact, although the interruption of the towing is accurate and free of unevenness, a perfect result is not guaranteed due to a variable flatness of the â € œcrudoâ € support, which will be defined only during the cooking phase. It follows that a slightly concave or convex tile will produce a line perpendicular to the direction of travel when crossing the interruption. This is the main problem of this type of transport, but it is not the only one: to minimize the width of the interruption (which still remains between 40 and 70 mm), small diameter idle pulleys are used. limited. Often the interruption is applied to a conveyor belt, obtaining similar results but with far higher costs.

Summary of the invention

The purpose of the invention is to provide a device that allows to eliminate the various drawbacks mentioned, with reference to the known technique, combining the advantages of the two methods without other compromises, thus ensuring an optimal drafting and almost recirculation. immediate glaze, which is not contaminated by belts, pulleys or anything else and therefore does not need to be filtered again. The advantages and characteristics of the glaze recovery device will become clearer from the description of an exemplary embodiment, made below, with reference to the attached drawings, given as a non-limiting example.

DESCRIPTION OF THE DRAWINGS

Figure 1 schematically represents a side view of the glazing line and the type of transport of the tiles indicated above as a continuous drive: the veil of glaze (2) produced by the glazing machine (1) comes into contact with the conveyor belts (4) when it is not there are tiles (5). The tank (3) recycles the enamel;

Figure 2 schematically represents a side view of the glazing line and the type of transport of the tiles indicated above as an interrupted drive: the veil of glaze (2) produced by the glazing machine (1) reaches the recovery tank (3) without dirtying the conveyor belts. transport (4) when there are no tiles (5);

Figure 3 represents schematically and in section the physical principle on which the invention is based: the falling veil of enamel (2), interrupted by the barrier (3), deviates its course generating a descending parabola (4) which represents the resultant of the vector forces following the impact. In this way a virtual shield is formed which avoids contact between the enamel (2) and the belt (5).

Figure 4 is a schematic and sectional view of the active barrier;

1. SAILING MACHINE;

2. FALLING ENAMEL VEIL;

3. BREAKING TOOL;

4. VIRTUAL SHIELD;

5. BELT (CRESTED).

Figure 5 schematically represents the inactive barrier, i.e. during the passage of the tile:

1. SAILING MACHINE;

2. FALLING ENAMEL VEIL;

3. BREAKING TOOL;

4. BELT (CRESTED);

5. TILE.

Figure 6 represents a perspective view of a purely indicative and non-limiting embodiment:

1. SUPPORTING STRUCTURE;

2. PNEUMATIC PISTON;

3. MOBILE STRUCTURE;

4. TUBULAR;

5. CANOPY ARM WITH VARIABLE LENGTH;

6. TOOL HOLDER;

7. TOOL;

8. REPOSITIONING ROD;

9. CARTER;

10. RECOVERY TANK.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT

The glaze recovery device is mechanically composed of three main parts, namely the bearing structure (1), the pneumatic piston (2) and the mobile structure (3). The supporting structure is an "Lâ € -shaped 8 mm thick plate on which the piston is fixed and can be placed on the frame of the glazing line or directly on the floor. A steel rod is applied to it (8). that borders the side of the tool and has the task of repositioning it. The piston is a pneumatic piston guided bilaterally with a 20 mm stroke arranged at 45â € with respect to the transport plane. The mobile structure is composed as follows: a tubular ( 4) It is fixed to the piston parallel to the transport plane and perpendicular to the direction of travel. Cantilevered "arms" (5) start from the tubular element, the length of which is directly proportional to the width of the recovery tank of the glazing machine ( 10) to which they serve. These arms can slide on the tubular (4) to adapt to the center distances of the transport belts and support the tool group which is in turn made up of two parts, the tool holder (6) and the tool (7). The first is made up of two flat irons joined together to form a 45 'angle on which it is fixed by means of a pin, which registers the tightening thanks to a compressing spring, the web breaking tool (7). The casing (9) can be seen in transparency.

The invention thus conceived is susceptible of modifications and variations, all of which are within the scope of the inventive concept. Furthermore, all the details can be replaced with other technically equivalent elements without departing from the scope of the protection of the following claims.

Claims (10)

R I V E N D I C A Z I O N I 1. Device for the recovery of the glaze that finds application in the ceramic industry, and more precisely in the glazing process of the tiles, characterized by the fact of being an accessory applicable to all the glazing machines (dies) on the market. 2. Device for the recovery of the glaze, according to the preceding claim, characterized in that raising a tool alternately between the tiles to be glazed allows the belts and the other transport members to remain perfectly clean. 3. Device for the recovery of the glaze, characterized by the fact that the movement of the tool can be obtained pneumatically, mechanically with motor or gears or in any other way that leads to the main advantage claimed in point 2. 4. Device for the recovery of the glaze, according to the preceding claims, characterized in that in order to avoid the contact of the glaze with the transport belts, it uses an invisible barrier that is created thanks to a physical reaction: the falling glaze veil meeting the barrier near the belt with an Angle of Attack (AoA) <90 ', it deviates its course, on the one hand following the contours of the tool (Coanda effect), and on the other generating a descending parabola which represents the resultant of the vector forces upon impact, "dodgingâ € the belt as shown in figure 2. 5. Device, according to claim 2, characterized in that the tool, in ascending, exploits a favorable moment, which is that lapse of time (s / 100), necessary for the glaze to reach the surface of the transport belts after the passage of the tile. 6. Device according to one or more preceding claims, characterized in that the type and assembly of the materials used does not compromise the integrity of the tile in case of contact; the tool made of soft, ultralight material and with excellent sliding properties (such as Teflon, polizene, etc.), avoids the passage of the tile without rubbing the bottom and altering its perfect decoration. In fact, there are no springs or mechanisms of any kind that force the original position (a spring is placed in front of the tool attachment but with the sole purpose of regulating its tightening). 7. Device according to one or more preceding claims, characterized in that it allows the repositioning of the tool at each descent operation, after each contact but only with the consent of the electrical control devices. 8. Glaze recovery device, according to the preceding claims, characterized in that it can also be successfully applied to methods for spreading the glaze alternative to the glazing machine, such as, for example, bell glazing, disc glazing or nozzle glazing sprayers of various capacities and angles fed by pumps of various types, as the operating principle is also valid in these cases. 9. Device according to the preceding claims, characterized in that it finds application in any industrial branch in which a total covering fluid is to be applied to an object transported by automatic lines with belts, chains or the like, such as for example chocolate on sweets, resin on wood, transparent final enamels etc. 10. Device for the recovery of the glaze, according to claim 1, characterized in that it can be an integral part of the recovery tank of a glazing machine.