ITSP950009A1

ITSP950009A1 - CABIN FOR PAINTING OBJECTS BY POWDER.

Info

Publication number: ITSP950009A1
Application number: IT95SP000009A
Authority: IT
Inventors: Giancarlo Ortombina; Giacomo Ricci
Original assignee: Zeus Electrostatic System S R
Priority date: 1995-09-29
Filing date: 1995-09-29
Publication date: 1997-03-29
Also published as: IT1282859B1; ITSP950009A0

Abstract

La cabina è atta alla verniciatura elettrostatica di oggetti (25) per rivestimento mediante polveri proiettate da pistole (18), con recupero automatico della polvere eccedente evitando così arresti per la rimozione manuale delle polveri medesime; è vantaggiosamente costituita da pareti tutte scorrevoli, vantaggiosamente da un involucro cilindrico (1) reso rotante e in depressione, internamente dotato di lance d'aspirazione (12), collettori d'aspirazione (10), involucro di protezione (28) del trasportatore interno (27) mantenuto in pressione: lance, collettori e involucro d'aspirazione sono sfilabili ed automaticamente ripulibili dai depositi di polvere tramite collari aspiranti; la cabina viene utilizzata nella verniciatura di oggetti costituenti l'armatura di un campo elettrostatico, nell'industria e nell'artigianato.The booth is suitable for electrostatic painting of objects (25) by coating with powders projected by guns (18), with automatic recovery of the excess dust thus avoiding stops for the manual removal of the same powders; it is advantageously made up of all sliding walls, advantageously by a cylindrical casing (1) made rotating and in depression, internally equipped with suction lances (12), suction manifolds (10), protection casing (28) of the internal conveyor (27) maintained under pressure: lances, manifolds and suction casing can be removed and automatically cleaned from dust deposits by means of suction collars; the booth is used in the painting of objects constituting the armature of an electrostatic field, in industry and crafts.

Description

L'invenzione concerne una cabina per la verniciatura di oggetti mediante poiveri, ossia un ambiente delimitato, all'interno del quale transitano gli oggetti da rivestire mediante proiezione, ad aria compressa, di vernice in polvere sulla loro superficie sotto l'azione di un campo elettrostatico, per poi avviarli alla stabilizzazione del rivestimento mediante fusione. The invention relates to a booth for painting objects by means of poiveri, i.e. a delimited environment, inside which the objects to be coated pass through the projection, with compressed air, of powder paint on their surface under the action of a field. electrostatic, and then send them to the stabilization of the coating by fusion.

Lo stato della tecnica comprende delle cabine prismatiche aperte alle estremità per il convogliamento degli oggetti da verniciare tramite convogliatore superiore, aventi pareti, fondo e soffitto della camera di verniciatura fissi, sui quali - e particolarmente sul fondo e sulle parti basse delle pareti - si deposita la polvere eccedente, che deve essere rimossa periodicamente tramite gravose operazioni manuali con interruzione del lavoro, impiego di mezzi aspiratori, manodopera costretta ad operare in ambiente inquinato e perdita di tempo. The state of the art includes prismatic booths open at the ends for conveying the objects to be painted by means of an upper conveyor, having fixed walls, bottom and ceiling of the painting chamber, on which - and particularly on the bottom and on the lower parts of the walls - it is deposited the excess dust, which must be removed periodically through heavy manual operations with interruption of work, use of suction means, labor forced to operate in a polluted environment and waste of time.

Esistono anche delle cabine prismatiche con pareti laterali costituite da teli srotolabili da rispettivi rotoli superiori verso il basso per convergere su un collettore aspirante di fondo: tali pareti potendo essere tagliate ed asportate in occasione del cambio di colore, peraltro con evidente ingombro e necessità di smaltimento. There are also prismatic booths with side walls consisting of sheets that can be unrolled from respective upper rolls downwards to converge on a bottom suction manifold: these walls can be cut and removed during the color change, however with evident bulk and the need for disposal. .

Tale stato anteriore della tecnica è suscettibile di ulteriori perfezionamenti con riguardo alla possibilità di evitare gli inconvenienti sopraindicati. This prior state of the art is susceptible of further improvements with regard to the possibility of avoiding the aforementioned drawbacks.

Da quanto precede deriva la necessità della risoluzione del problema tecnico di trovare una cabina di verniciatura mediante polveri, vantaggiosamente a ciclo automatico, che non necessiti di, o comunque drasticamente riduca la, rimozione manuale delle polveri eccedenti evitando condizioni di lavoro gravose, perdite di tempo, costi accessori, ritardi e difficoltà nel cambio del colore. From the foregoing derives the need to solve the technical problem of finding a powder coating booth, advantageously with an automatic cycle, which does not require, or in any case drastically reduces, the manual removal of excess powders avoiding heavy working conditions, waste of time. , ancillary costs, delays and difficulties in changing the color.

L'invenzione risolve il problema tecnico suddetto adottando una cabina di verniciatura mediante polveri in campo elettrostatico nella quale tutte le superficie interne della camera di verniciatura sono rese scorrevoli, in continuo o con intermittenza, per l'evacuazione delle polveri eccedenti depositate su di esse; essendo previsti mezzi pneumatici interni ed esterni per aspirare le polveri immesse pneumaticamente ed eccedenti ai fini di rivestire gli oggetti mediante proiezione di esse e separarle dall'aria, oltre che per stabilire differenze di pressione all'interno della cabina; detti mezzi essendo principalmente costituiti da: The invention solves the aforementioned technical problem by adopting a powder coating booth in an electrostatic field in which all the internal surfaces of the painting chamber are made to slide, continuously or intermittently, for the evacuation of the excess powders deposited on them; internal and external pneumatic means being provided for sucking up the dusts introduced pneumatically and in excess in order to cover the objects by projection of them and separate them from the air, as well as to establish pressure differences inside the booth; said means being mainly constituted by:

- almeno una lancia assialmente estraibile per l'aspirazione dello strato di polvere depositato sulla superficie interna scorrevole della cabina, pneumaticamente comunicante con ciclone separatore ad alta prevalenza; - at least one axially extractable lance for suction of the layer of dust deposited on the internal sliding surface of the booth, pneumatically communicating with a high head cyclone separator;

- almeno un collettore aspirante per captare miscela aria polvere determinando depressione all'interno della cabina, pneumaticamente comunicante con ciclone separatore ad elevata portata, ad evitare fuoriuscita di polvere dalla cabina; - almeno un trasportatore longitudinale degli oggetti da verniciare, interno alla cabina, protetto da un involucro periferico inferiormente aperto quanto basta per ii passaggio degli elementi di sospensione degli oggetti medesimi: l'interno di detto involucro essendo mantenuto a pressione superiore a quella esistente all'interno dell'involucro della cabina, ad evitare ingresso di polveri nel meccanismo del trasportatore medesimo; - at least one suction manifold for capturing air-dust mixture causing depression inside the booth, pneumatically communicating with a high-flow cyclone separator, to prevent dust from escaping from the booth; - at least one longitudinal conveyor of the objects to be painted, inside the booth, protected by a peripheral casing open at the bottom enough for the passage of the suspension elements of the same objects: the inside of said casing being kept at a pressure higher than that existing inside inside the enclosure of the booth, to prevent dust from entering the conveyor mechanism itself;

- almeno una zona di aspirazione periferica delle polveri depositate sulla superficie esterna di almeno uno dei mezzi sopra indicati. - at least one peripheral suction area of the powders deposited on the external surface of at least one of the aforementioned means.

I vantaggi ottenuti sono: evacuazione delle polveri eccedenti senza dover ricorrere all'intervento manuale, o limitando drasticamente l'intervento manuale medesimo; rimozione immediata e totale delle polveri, anche in continuo, impedendone l'invecchiamento e la decomposizione per assorbimento dell'umidità e delle impurità atmosferiche; perfetta pulizia delle superficie interne; eliminazione, o riduzione drastica, di perdite di tempo e di interruzioni forzate del lavoro; eliminazione, o riduzione drastica, di lunghe operazioni di pulizia generalmente necessarie nelle fasi di cambio del colore; riduzione dei costi di manutenzione. The advantages obtained are: evacuation of excess dust without having to resort to manual intervention, or by drastically limiting the manual intervention itself; immediate and total removal of dust, even continuously, preventing aging and decomposition by absorbing humidity and atmospheric impurities; perfect cleaning of the internal surfaces; elimination, or drastic reduction, of wasted time and forced work stoppages; elimination, or drastic reduction, of lengthy cleaning operations generally necessary in the phases of color change; reduction of maintenance costs.

Alcuni modi di attuare l'invenzione sono illustrati a puro titolo esemplificativo, nelle cinque tavole di disegno allegate, in cui: Figura 1 è una sezione verticale trasversale schematica di una cabina di smaltatura costituita da una superficie interna cilindrica resa rotante; Figura 2 è una vista in pianta, con trasparenza, della stessa cabina di Figura 1 , dotata di mezzi per la proiezione della vernice in polvere e di aspirazione delle polveri eccedenti, per l'ingresso dei relativi dispositivi dalle due testate e del trasportatore aereo, integrata con i gruppi di aspirazione, recupero polveri e autopulitura; Figura 3 è una vista in alzata frontale e schematica della cabina cilindrica rotante integrata con i gruppi di aspirazione, recupero polveri e autopulitura; Figura 4 è una vista laterale della cabina cilindrica rotante di Figura 3; Figura 5 è la sezione verticale trasversale schematica di una cabina prismatica a quattro pareti comunque rese scorrevoli, con mezzi di proiezione della vernice, mezzi di aspirazione delle polveri e trasportatore interni, ad esempio tutti longitudinalmente estraibili: la pulitura potendo essere eseguita sia internamente, che all'esterno, quando le pareti siano costituite ciascuna da un nastro scorrevole; Figura 6 è una sezione analoga nel caso di una cabina le cui pareti fanno parte di uno stesso elemento scorrevole, anch'essa con elementi di proiezione e aspirazione estraibili, ma con trasportatore esterno. Some ways of carrying out the invention are illustrated purely by way of example, in the five attached drawing tables, in which: Figure 1 is a schematic transverse vertical section of an enamelling booth consisting of a cylindrical internal surface made rotating; Figure 2 is a plan view, with transparency, of the same booth of Figure 1, equipped with means for the projection of the powder paint and for the suction of excess powders, for the entry of the relative devices from the two heads and of the overhead conveyor, integrated with suction, dust recovery and self-cleaning units; Figure 3 is a schematic front elevation view of the cylindrical rotating booth integrated with the suction, dust recovery and self-cleaning units; Figure 4 is a side view of the rotating cylindrical cabin of Figure 3; Figure 5 is the schematic cross-sectional vertical section of a prismatic booth with four walls, however made sliding, with means of projection of the paint, means of dust suction and internal conveyor, for example all longitudinally extractable: the cleaning can be carried out both internally and outside, when the walls are each made up of a sliding belt; Figure 6 is a similar section in the case of a booth whose walls are part of the same sliding element, also with extractable projection and suction elements, but with an external conveyor.

Sono indicati: con 1 un involucro ciiindrico adagiato su almeno due coppie 2 di ruote isolanti ad asse longitudinale orizzontale, delle quali almeno una coppia azionata da motore 3: dette ruote essendo girevolmente supportate al basamento 4 dotato di mezzi di messa a terra, munito di due coppie di guide longitudinali 5 per lo scorrimento in esse dei carrelli 6, 7 (Figure 2, 3, 4) rispettivamente per lo scorrimento, longitudinale e in verso contrario, dei supporti 8, 9 dei collettori aspiranti 10, 11 e lance aspiranti 12, 13 e delle colonne 14, 15 ciascuna dotata di braccio verticalmente mobile 16, 17 supportante uno o più mezzi di proiezione delle polveri, ad esempio pistole 18 proiettanti la vernice in polvere, orientabili nello spazio: ciascuna colonna 14, 15 essendo inferiormente dotata di guide 19 per il moto trasversale guidato e ciascun carrello 6, 7 essendo inferiormente ripetuto in un carrello rotolante sul pavimento; con 20 una coppia di nervature periferiche esterne di testata per irrigidimento, integrate da bordi d'estremità delle bocche 21 , 22 dell'involucro cilindrico 1 aventi sezione longitudinale arcuata a restringere le bocche medesime, costituendo contemporaneamente ostacolo al debordamento delle polveri e invito delle stesse a permanere nel moto di scorrimento circolare per il ritorno della miscela aria-polvere all'interno dell'involucro; con 23 (Figura 4) una nervatura analoga alle nervature 20, ma in posizione intermedia, avente anche funzione antiscorrimento assiale ottenuto mediante passaggio delia nervatura stessa tra una coppia di rulli di fondo 24; con 25 gli oggetti da verniciare, appesi mediante ganci 26 trainati da catena trasportatrice aerea 27 interna all'involucro cilindrico 1, racchiusa da un proprio involucro longitudinale 28 sostanzialmente cilindrico, sfilabile assialmente da entrambi i lati ed inferiormente aperto: tale involucro 28 essendo mantenuto a pressione superiore a quella dell'interno dell'involucro cilindrico 1 per impedire l'ingresso delle polveri all'interno del medesimo involucro 28, tramite ventilatori 29, 30; con 31 l'apertura di ciascun collettore 10, 11, trasversalmente opposto alle pistole spruzzatrici di aspirazione della miscela aria polvere eccedente all'interno dell'involucro cilindrico 1, rivolta verso la parete dell'involucro cilindrico stesso, tramite depressione generata dai ventilatori 32 ad elevata portata , connessi con i cicloni 33 separatori della polvere daH'aria; con 34 l'apertura delle lance aspiranti 12, 13, munita di labbro 35 in materiale elastico strisciante sull'involucro 1; con 36, 37, 38 dei collari aspiranti coassiali esterni rispettivamente ai collettori 10, 11, alle lance aspiranti 12, 13 e all'involucro longitudinale 28, supportati alle tubazioni 39, 40, 41 di connessione alla coppia di cicloni di minore portata 42, munito di ventilatori 43 ad alta prevalenza: tali collari avendo la funzione di esercitare aspirazioni sulle superficie esterne di detti collettori, lance aspiranti e involucro longitudinale, durante le operazioni di estrazione ed inserimento compiute tramite carrelli 6; con 44, 45 due valvole rispettivamente per intercettare il flusso verso il ciclone 42 ad alta prevalenza nella fase di aspirazione delle lance 12, 13 e per deviare il flusso verso il medesimo ai collari aspiranti 36, 37, 38 nella fase di pulitura durante il movimento d'estrazione del carrello 6; con 46 un gruppo filtrante a cartucce filtranti atte ad essere pulite tramite impulsi di aria compressa per il recupero della pur trascurabile percentuale di polveri a perdere, persistenti nell'aria in quanto non captabili nei cicloni; con 47, 48, 49, 50 (Figura 5) quattro pareti indipendentemente scorrevoli e nei modi possibili, vantaggiosamente costituite da nastri traslanti avvolti su rulli, uno almeno dei quali motore, eventualmente anche ripetibili longitudinalmente, delimitanti una camera di verniciatura a sezione ad esempio quadrata, rettangolare (o prismatica in genere), ali'interno della quale sono analogamente inseriti i collettori aspiranti, le lance aspiranti, il trasportatore degli oggetti e le pistole, tutti vantaggiosamente assistiti dallo stesso impianto di aspirazione e recupero; le lance aspiranti potendo, in alternativa, essere installate anche all'esterno delle singole pareti; con 51 (Figura 6) un nastro traslante, avvolto su e rinviato da, rulli uno almeno dei quali motore, costituente l'insieme delie pareti, con possibilità di installazione delle lance aspiranti e del trasportatore degli oggetti anche all'esterno; con 54 una interruzione del nastro traslante 51; con 53 un diaframma parzializzatore della sezione di passaggio degli oggetti da verniciare. The following are indicated: with 1 a cylindrical casing lying on at least two pairs 2 of insulating wheels with horizontal longitudinal axis, of which at least one pair driven by a motor 3: said wheels being rotatably supported to the base 4 equipped with grounding means, equipped with two pairs of longitudinal guides 5 for the sliding in them of the trolleys 6, 7 (Figures 2, 3, 4) respectively for the longitudinal and reverse sliding of the supports 8, 9 of the suction manifolds 10, 11 and suction lances 12 , 13 and of the columns 14, 15 each equipped with a vertically movable arm 16, 17 supporting one or more means for projecting the powders, for example guns 18 projecting the powder paint, orientable in space: each column 14, 15 being equipped at the bottom with guides 19 for the guided transverse motion and each carriage 6, 7 being repeated below in a carriage rolling on the floor; with 20 a pair of external peripheral head ribs for stiffening, integrated by end edges of the mouths 21, 22 of the cylindrical casing 1 having an arched longitudinal section to narrow the mouths themselves, at the same time constituting an obstacle to the overflowing of the powders and an invitation to the same to remain in the circular sliding motion for the return of the air-powder mixture inside the casing; with 23 (Figure 4) a rib similar to the ribs 20, but in an intermediate position, also having an axial anti-slip function obtained by passing the rib itself between a pair of bottom rollers 24; with 25 the objects to be painted, hung by hooks 26 pulled by an overhead conveyor chain 27 inside the cylindrical casing 1, enclosed by its own longitudinal casing 28 substantially cylindrical, axially removable from both sides and open at the bottom: this casing 28 being kept at pressure higher than that of the inside of the cylindrical casing 1 to prevent dust from entering inside the casing 28, by means of fans 29, 30; with 31 the opening of each manifold 10, 11, transversely opposite the suction spray guns of the excess air-powder mixture inside the cylindrical casing 1, facing the wall of the cylindrical casing itself, by means of a depression generated by the fans 32 ad high flow rate, connected with the cyclones 33 separators of the dust from the air; with 34 the opening of the suction lances 12, 13, provided with a lip 35 made of elastic material sliding on the casing 1; with 36, 37, 38 coaxial suction collars external respectively to the manifolds 10, 11, to the suction lances 12, 13 and to the longitudinal casing 28, supported on the pipes 39, 40, 41 for connection to the pair of cyclones of lesser capacity 42, equipped with high-head fans 43: these collars having the function of exerting aspirations on the external surfaces of said manifolds, suction lances and longitudinal casing, during the extraction and insertion operations carried out by means of trolleys 6; with 44, 45 two valves respectively to intercept the flow towards the high-head cyclone 42 in the suction phase of the lances 12, 13 and to divert the flow towards the same to the suction collars 36, 37, 38 in the cleaning phase during the movement for the extraction of the trolley 6; with 46 a filtering group with filtering cartridges suitable for being cleaned by means of compressed air pulses for the recovery of the even negligible percentage of disposable dust, persistent in the air as it cannot be collected in cyclones; with 47, 48, 49, 50 (Figure 5) four independently sliding walls and in the possible ways, advantageously constituted by translating belts wound on rollers, at least one of which motor, possibly also repeatable longitudinally, delimiting a sectional painting chamber for example square, rectangular (or prismatic in general), inside which the suction manifolds, the suction lances, the object conveyor and the guns are similarly inserted, all advantageously assisted by the same suction and recovery system; the suction lances being able, alternatively, to be installed also outside the single walls; with 51 (Figure 6) a translating belt, wound on and sent back by rollers, at least one of which is a motor, constituting the whole of the walls, with the possibility of installing the suction lances and the conveyor of the objects also outside; with 54 an interruption of the translating belt 51; with 53 a shutter that regulates the passage section of the objects to be painted.

Il funzionamento, nel caso delle Figure da 1 a 4, avviene nel modo seguente: stabilite le condizioni di pressione e di moto nella cabina di verniciatura ad involucro cilindrico rotante 1, avviato il trasportatore 27 degli oggetti 25 da verniciare, si azionano i bracci verticalmente mobili 16, 17 delle colonne 14, 15 per posizionare le pistole 18, debitamente orientate: le polveri proiettate vengono attratte dagli oggetti 25 e li rivestono; l'eccedenza, in parte cade sulla superficie interna dell'involucro 1 per essere aspirata dalle lance aspiranti 12, 13, in parte viene captata dai collettori aspiranti 10, 11. The operation, in the case of Figures 1 to 4, takes place as follows: once the pressure and motion conditions in the rotating cylindrical casing painting booth 1 have been established, the conveyor 27 of the objects 25 to be painted is started, the arms are operated vertically furniture 16, 17 of the columns 14, 15 to position the guns 18, duly oriented: the projected powders are attracted by the objects 25 and coat them; the excess, in part falls on the internal surface of the casing 1 to be sucked by the suction lances 12, 13, in part it is captured by the suction manifolds 10, 11.

La pulizia delia cabina in vista del cambio di colore si riduce a pochi minuti, tramite operazioni automatiche di rotazione dell'involucro cilindrico 1 e di estrazione dei collettori aspiranti 10, 11, delle lance aspiranti 12, 13 e dell'involucro longitudinale 28 di protezione del trasportatore 27, sottoposti all'azione pulitrice dei collari aspiranti 36, 37, 38: quanto basta per rimuovere l'ultimo strato di polvere depositato. The cleaning of the booth in view of the color change is reduced to a few minutes, by means of automatic operations of rotation of the cylindrical casing 1 and extraction of the suction manifolds 10, 11, of the suction lances 12, 13 and of the longitudinal protective casing 28. of the conveyor 27, subjected to the cleaning action of the suction collars 36, 37, 38: enough to remove the last deposited layer of dust.

Previo movimento di estrazione delle colonne 14, 15 si portano all'esterno i bracci 16, 17 con pistole 18 per la pulizia tramite soffiatura: anche questa eseguita in connessione con il gruppo filtrante 46, che crea depressione in apposito armadio collettore non raffigurato. After extracting the columns 14, 15, the arms 16, 17 are brought outwards with guns 18 for cleaning by blowing: this is also carried out in connection with the filtering unit 46, which creates a depression in a special collector cabinet not shown.

Quanto alle cabine di cui alle Figure 5, 6, il funzionamento è analogo: peraltro le lance aspiranti 12, 13, e il trasportatore 27 possono essere istallati anche all'esterno. As for the booths of Figures 5, 6, the operation is similar: however, the suction lances 12, 13, and the conveyor 27 can also be installed outside.

Nel caso, le pareti 47, 48, 49, 50, 51, costituite da nastro traslante consentono la pulizia anche in continuo, come per la versione ad involucro cilindrico 1. In this case, the walls 47, 48, 49, 50, 51, made up of a translating belt, also allow continuous cleaning, as for the version with cylindrical casing 1.

Nell'attuazione pratica, i materiali, le dimensioni, i particolari esecutivi, potranno essere diversi da quelli indicati, ma ad essi tecnicamente equivalenti, senza per questo uscire dal dominio giuridico della presente invenzione. In the practical implementation, the materials, the dimensions, the executive details, may be different from those indicated, but technically equivalent to them, without thereby departing from the legal domain of the present invention.

Claims

CLAIMS 1. Booth for painting objects using powders, comprising an enclosure open at the ends for the passage of the objects (25) to be painted conveyed by a longitudinal conveyor (27), at least one means (18) for projection of the powder in the electrostatic field, at least a lance for the suction of the powders and at least one suction manifold also for determining depression inside said casing, characterized by the fact that all the internal surfaces of the painting chamber are made sliding, continuously or intermittently, for the evacuation of excess dust deposited on them; pneumatic means, internal or external, being provided for: - vacuuming the dust introduced pneumatically to coat the objects (25) and exceeding the purpose; - pressurize, or under vacuum, parts inside the enclosure of the booth; - external means being provided for separating the excess powders from the sucked air together with them.

2. Means for sucking up the powders introduced pneumatically to coat the objects (25) and exceeding the purpose, according to claim 1, characterized by this, which consist of at least one suction lance (12) sliding on the sliding wall of the booth to clean it.

3. Means for sucking up the powders introduced pneumatically to coat the objects (25) and exceeding the purpose, according to claim t, characterized by this, which consist of at least one suction manifold (10) inserted in the booth.

4. Means, according to claim 3, characterized by this, which are located in opposition to the dust projection means (18), beyond the objects (25).

5. Means for pressurizing parts inside the enclosure of the booth, according to claim 1, characterized in that they consist of a longitudinal enclosure (28) enveloping the conveyor (27) of the objects to be painted (25) passing through the inside the booth, pressurized by at least one fan (29) to prevent dust from entering the longitudinal casing.

6. Means for depressing the interior of the enclosure of the booth, according to claim 1, characterized in that they consist of at least one suction lance (12).

7. Means for depressing the interior of the enclosure of the booth, according to claim 1, characterized in that they consist of at least one suction manifold (10).

8. Means for sucking up dust, according to claims 1, 2, characterized in that the external end of each suction lance (12) is wrapped in at least one suction collar (37) suitable for cleaning the lance itself during the extraction.

9. Means for sucking up the dust, according to claims 1, 3, characterized in that the external end of each suction manifold (10) is wrapped by at least one suction collar (36) suitable for cleaning the manifold itself during motion extraction.

10. External means for sucking up the dust, according to claims 1, 5, characterized in that the outer end of the longitudinal protective casing (28) of the conveyor (27) of the objects to be coated (25) is wrapped by at least a suction collar (38) adapted to clean the casing itself during the extraction motion.

11. External means for separating the excess dust from the sucked air together with them, according to at least one of claims 2, 3, 4, 5, 8, 9, 10, characterized in that one or more suction lances (12), suction manifolds (10) and suction collars (37, 36, 38) are connected with a high prevalence cyclone (42).

12. Means for depressing the interior of the enclosure of the booth, according to claim 7, characterized in that the suction manifold (10) is in communication with a cyclone (33) with a high flow rate.

13. Means for sucking up dust, according to at least one of claims 2, 3, 5, 8, 9, 10, characterized in that the flow towards the high prevalence cyclone (42) coming from at least one suction lance (12) it is intercepted by a valve (44) to divert it, by means of a valve (45), to the suction collars (36, 37, 38) during the extraction motion of said at least one suction lance (12), of said at least one suction manifold (10) and of said longitudinal casing (28).

Cab, according to at least one of the preceding claims, characterized in that it is delimited by a cylindrical casing (1) made to rotate around a longitudinal axis.

Cab, according to claim 14, characterized in that said cylindrical casing (1) rests on at least two pairs of wheels (2), at least one pair of which is driving.

Cabin, according to claim 1, characterized in that the conveyor (27) of the objects (25) to be coated passes inside the cabin itself.

Cabin according to claim 1, characterized in that the cross section of the cylindrical casing (1) is narrowed by arcuate end edges of the mouths (20, 21).

18. Booth, according to claim 14, characterized in that being the means for projection (18) of the powders inside the cylindrical casing (1) carried by at least one vertically movable arm (16), said arm protrudes longitudinally towards the inside of the cylindrical casing (1), supported by an external column (14) at the bottom equipped with a transversely sliding support (9) and a carriage (7) sliding in the longitudinal guides (5) of the base (4): said carriage being repeated below to slide across the floor.

19. Cabin, according to claim 14, characterized in that the at least one suction lance (12) and one suction manifold (10) and the longitudinal casing (28), inside the cylindrical casing (1), are fixed to a support (8) equipped with a carriage (6) sliding in the longitudinal guides (5) of the base (4): said carriage being repeated below to slide on the floor.

Cabin, according to claims (14, 19) characterized in that being said at least one suction lance (12), said at least one suction manifold (10) and said longitudinal casing (28), embraced by at least one respective collar d suction (37, 36, 38), each said collar is supported on the respective pipe (40, 39, 41) which connects it to the respective high head cyclone (42).

21. Cabin, according to claim 14, characterized in that since the conveyor (27) is inside the cylindrical casing (1) equipped with a longitudinal casing (28) open at the bottom for the passage of the hooks (26) supporting the objects ( 25) to be coated, said casing is kept under pressure by at least one fan (29).

22. Cabin, according to at least one of claims 1 to 13, characterized in that it is delimited by at least three walls, each consisting of a translating belt wound on rollers, of which at least one is a motor.

23. Cabin, according to claim 22, characterized in that being delimited by four walls, consisting of as many translating belts (47, 48, 49, 50) each wound on a pair of rollers, of which at least one motor, being the means projection (18) of the powders, inside the cylindrical casing (1), carried by at least one vertically movable arm (16), said arm protrudes longitudinally towards the inside of the cylindrical casing (1), supported by a column external (14) at the bottom equipped with a support (9) sliding transversely and with a carriage (7) sliding in the longitudinal guides (5) of the base (4): said carriage being repeated at the bottom to slide on the floor.

24. Cabin according to claim 22, characterized in that the at least one suction lance (12), one suction manifold (10) and the longitudinal casing (28) inside the cylindrical casing (1), are fixed to a support (8) equipped with a carriage (6) sliding in the longitudinal guides (5) of the base (4): said carriage being repeated below to slide on the floor.

Cabin, according to claim 22, characterized in that being said at least one suction lance (12), said at least one suction manifold (10) and said longitudinal casing (28), embraced by at least one respective suction collar ( 37, 36, 38), each said collar is supported on the respective pipe (40, 39, 41) which connects it to the respective high head cyclone (42).

Cabin, according to claim 22, characterized in that since the conveyor (27) is inside the cylindrical casing (1) equipped with a longitudinal casing (28) open at the bottom for the passage of the hooks (26) supporting the objects ( 25) to be coated, said casing is kept under pressure by at least one fan (29).

Cabin, according to claim 22, characterized in that at least one suction lance (12) is installed against the external branch of the translating belt (51) in one or more faces of the cabin itself.

28. Cabin, according to claim 22, characterized in that, being delimited by four walls, it is formed by a single translating belt (51), wound on and returned by, at least one of which is driving rollers: the initial and final roller for winding the belt being advantageously opposed astride the center line of the car ceiling giving rise to an interruption (52) in which the suspension hooks of the objects (25) to be covered by the conveyor (27) external to the car pass.

29. Cabin, according to claim 27, characterized in that, being the means for projection (18) of the powders, inside the cylindrical casing (1), carried by at least one vertically movable arm (16), said arm protrudes longitudinally towards the inside of the cylindrical casing (1), supported by an external column (14) at the bottom equipped with a transversely sliding support (9) and a carriage (7) sliding in the longitudinal guides (5) of the base (4): said trolley being repeated below to slide on the floor.

30. Cabin, according to claim 27, characterized in that the at least one suction lance (12), one suction manifold (10) and the longitudinal casing (28) inside the cylindrical casing (1), are fixed to a support (8) equipped with a carriage (6) sliding in the longitudinal guides (5) of the base (4): said carriage being repeated below to slide on the floor.

31. Cabin, according to claim 27, characterized in that being said at least one suction lance (12), said at least one suction manifold (10) and said longitudinal casing (28), embraced by at least one respective suction collar ( 37, 36, 38), each said collar is supported on the respective pipe (40, 39, 41) which connects it to the respective high head cyclone (42).

Cabin, according to claim 27, characterized in that at least one suction lance (12) is installed against the external branch of the translating belt of one or more walls (47, 48, 49, 50) of the cabin itself.