EP1413362A1 - Method and booth for preparing and painting surfaces in the same enclosure - Google Patents

Abstract

The process involves presenting an order for necessary tools in the form of a box assembled on a wall of an enclosure (1). The box includes an electric and pneumatic power distribution unit that is coupled to an electric socket-outlet. An air intake in the box controls the pulverization of equipment of detachable painting. A valve controls the collection of dust extraction of sandpapering. An Independent claim is also included for a cabin used for treatment and preparatory work of an automobile body.

Description

The present invention relates to the field of surface treatment of various parts, in particular the field of automobile bodywork and in particular of cabins used for bodywork preparation and treatment works and relates to a process for the preparation of surfaces to be painted and painting of these surfaces in the same enclosure.

The invention also relates to a cabin for implementing this method.

Currently, in the case of surface coating by painting, the various operations for preparing said surfaces and for painting them are generally carried out in a series of separate operations and on work areas or in specific and also separate premises. .

Thus, in the particular field of automobile bodywork, at least two separate work places are generally provided, namely a cabin or area for sanding and possibly straightening the bumpy surfaces and prior puttying and a separate paint cabin, in which the elements to be painted are subjected, in a clean atmosphere, to the spraying of paint or primers, and where the paint coating is subjected to drying by radiation or by circulation of hot air. Such installations are notably known from US-A-4,106,430, US-A-4,537,120, JP-A-10 05858 and DE-C-508 557.

The existing installations make it possible to correctly ensure the treatment of surfaces to be painted and their painting, but require, however, several displacements of the objects to be treated, so that the labor time is necessarily increased, which negatively influences on production costs. In addition, certain preliminary treatments before painting, such as sanding induce local pollution, such as dust emissions, which have the consequence of requiring, in order to comply with the regulations in force in terms of hygiene, the installation of additional means , such as exhaust and / or exhaust air treatment units.

It follows that, for the treatment of a given object, namely, for example, a car body, it is necessary to move it from a first preparation station to a second painting and drying station for the latter, so that the available space must be relatively large, as well as the corresponding equipment, which induces installation costs also important.

In addition, the known preparation and / or painting booths use aspiration and / or treatment assemblies of stale air, as well as heating and drying, the control of which is ensured by means of devices to manual actuation. As a result, in the particular cases of need to evacuate stale air, during a painting operation, the corresponding command may not be immediately implemented, as well as a stop command for such an evacuation of stale air can be postponed after the end of a painting operation.

It follows, on the one hand, an increase in pollution by releasing pollutants into the atmosphere for an unduly prolonged period and, on the other hand, an increased consumption of energy for heating the fresh air for drying, as well as a risk of recirculation of highly polluted air.

The aim of the present invention is to overcome these drawbacks by proposing a method and a booth for preparing surfaces to be painted and for painting these surfaces in a single enclosure making it possible to carry out all the work for preparing surfaces to be painted and painted. of these surfaces in the same enclosure, without moving the objects to be painted between the different operations and by ensuring an automatic evacuation of stale air from the start of a painting operation.

To this end, the process for preparing surfaces to be painted and for painting these surfaces is characterized in that it consists in carrying out all the preparation and painting operations in the same closed enclosure, under a slight overpressure of air, without moving the object to be treated, the painting operations triggering an impossibility of implementing all the other preparation and drying operations.

The invention also relates to a cabin for implementing this process, which is essentially in the form of a closed enclosure and characterized in that it comprises at least one work station, a single group of ventilation in overpressure, at least one lifting table, at least one energy distribution and control satellite for the tools necessary for carrying out the various operations, by work station, by at least one disconnectable painting equipment and by at least one radiation drying means.

• la figure 1 est une vue en élévation frontale et en coupe de la cabine pour la mise en oeuvre du procédé conforme à l'invention ;
• la figure 2 est une vue en plan et en coupe de la cabine, sans le groupe de ventilation, et
• la figure 3 est une vue en élévation frontale et à plus grande échelle d'un satellite de distribution d'énergie et de commande ;
• les figures 4 à 6 sont des vues schématiques en plan représentant un groupe de ventilation, respectivement en positions d'évacuation d'air vicié, de recyclage d'air avec renouvellement et de recyclage d'air total, et
• les figures 7 à 9, 10 à 12 et 13 à 15 sont des vues analogues à celles des figures 4 à 6 représentant des variantes de réalisation du groupe de ventilation.

The invention will be better understood from the description below, which relates to a preferred embodiment, given by way of nonlimiting example, and explained with reference to the appended schematic drawings, in which:

• Figure 1 is a front elevational view in section of the cabin for the implementation of the method according to the invention;
• FIG. 2 is a plan view and in section of the cabin, without the ventilation unit, and
• Figure 3 is a front elevational view on a larger scale of a power distribution and control satellite;
• FIGS. 4 to 6 are schematic plan views showing a ventilation group, respectively in stale air discharge, air recycling with renewal and total air recycling positions, and
• Figures 7 to 9, 10 to 12 and 13 to 15 are views similar to those of Figures 4 to 6 showing alternative embodiments of the ventilation unit.

FIG. 1 of the appended drawings represents a cabin, which is essentially in the form of a closed enclosure 1.

According to the invention, this cabin is intended for the implementation of a process for the preparation of surfaces to be painted and for painting of these surfaces, which consists in carrying out all of the preparation and painting operations in said same enclosure. closed 1, under a slight overpressure of air, without displacement of the object to be treated, the painting operations triggering an impossibility of implementing all the other preparation and drying operations.

To this end, the cabin forming the closed enclosure 1 comprises at least one work station 2, a single overpressure ventilation group 3, at least one lifting table 4, at least one satellite 5 for power distribution and control for the tools necessary for carrying out the various operations, by work station 2, by at least one disconnectable painting equipment 6 and by at least one radiation drying means 7.

The preparation and painting operations are carried out in said same closed enclosure 1, under a slight air pressure, without movement of the object to be treated and the painting operations trigger an impossibility of implementing all the other preparation and drying operations.

The preparation operations consist of straightening bumpy surfaces, then puttying these surfaces on a work station 2, and possibly on the lifting table 4 of this station 2, the putty being followed by a period of deep drying of the sealants and primers via the radiation drying means 7. After this drying, a sanding operation is carried out with the use of a suction sander connected to the power distribution and control satellite 5.

The slight overpressure of air is ensured by the single overpressure ventilation group 3, which is connected to the enclosure 1, on the one hand, via blowing ducts 8 to at least one plenum 9 extending above work station 2 and, on the other hand, by means of extraction ducts 10 to at least one box 11 provided with a grating 12, the blowing 8 and extraction ducts 10 being each provided with 'a corresponding valve 8' and 10 '(Figure 1). This overpressure ventilation group 3 is advantageously coupled to a heating means making it possible to simultaneously maintain the temperature of the enclosure 1 during cold periods.

The lifting table 4 is of known type, in particular in the field of automobile repair, and is not described in more detail. Such a table essentially makes it possible to ensure perfect ergonomics of the work station and is embedded in the ground at the level of the grating 12 in the non-use position, thus freeing up an additional working surface.

Each energy distribution and control satellite 5 for the tools necessary for carrying out the various operations is advantageously in the form of a box mounted in the wall of the enclosure 1 and connected to the means for distributing electrical energy and pneumatic, this box comprising on the front side the necessary connection means, namely at least one electrical outlet 13, a regulated air intake 14, an unregulated air intake 15, a device 16 for adjusting the pressure of the regulated air intake 14, a pressure gauge 17, a sanding dust intake 18, a set 19 to 22 of air intakes 19, 20 for spraying and controlling disconnectable paint 6, pressure adjustment 21 spray and pressure gauge 22 for controlling the spray pressure and by a valve 23 for controlling the intake 18 for sanding dust suction (FIG. 3).

The single overpressure ventilation group 3 is further provided, in the case of construction of the enclosure, with several work stations, of a reversing valve 24 for controlling the suction circuit, intended to allow operation with total or recycled air renewal during cold periods, as well as making a preferential choice of operation for the single overpressure ventilation group 3 in relation to a workstation 2. As a result, apart from the painting phases , which are always carried out with total air renewal, the heating requirement is eliminated, as are the corresponding costs. The disconnectable paint equipment 6 is advantageously in the form of a paint gun.

The radiation drying means 7 is preferably constituted by at least one ramp with infrared or ultraviolet radiation and is advantageously mounted in the enclosure 1 in a movable manner along a horizontal axis passing through the entire enclosure 1 under the plenum 9. This means 7 can, moreover, be adjustable in position relative to the plenum 9. Thus, a single radiation drying means 7 is sufficient for all of the work stations 2, so that the investment is reduced correspondingly.

The enclosure 1 proper is produced in the form of a fully closed sheet steel carcass and provided with rigid or flexible access doors in the form of curtains made of a material having a fire resistance of M0 quality. This enclosure 1 is further provided with multiple light sources, a prefilter on the air inlet and diffusing filters in the plenum (s) 9 to stop the introduction of dust into the enclosure 1 and an extraction filter under the grating or gratings 12, in order to retain the primer or paint pigments before air is released to the atmosphere. Furthermore, the enclosure 1 may include a straightening device, not shown. Such a straightening device is of perfectly known type and can be fixed in a removable manner either in a rail fixed to the ground or integrated into the ground or else in a rail fixed on the grating or be fixed directly on the grating.

The sanding operation is carried out with a connected suction sander, for its drive to the regulated air intake 14, and for the evacuation of sanding dust at the suction outlet 18 for sanding dust from the power distribution and control satellite 5. During this sanding, the dust produced is captured approximately 80% by the sander itself and the remaining 20% is entrained by the air flow due to ventilation, so that it does not pollute the working environment of the neighboring station (s). The suction of the dust by means of the socket 18 is triggered by means of the control valve 23.

Several stations can work simultaneously, the ventilation then being distributed in equal parts via the valves 8 'and 10' which allow the distribution of pressurized air in the plenums 9 and therefore above the workstations 2. These valves 8 'also allow distribution over a single workstation during a painting operation and then automatically shut off the air supply above the workstation (s) 2.

In cold periods, the reversing valve 24 for controlling the suction circuit also allows air recycling, the remaining dust being retained at the level of the prefilters and filters equipping the plenum (s) 9 and the grating (s) 12 .

After sanding the sealants and primers, the masking, the priming of the surfaces and the sanding of the primers are carried out under a slight overpressure of air due to the continuous operation of the ventilation group at overpressure 3. Then, and always under the same overpressure of air, cleaning is carried out before application of the paint, namely, for example, by means of an air jet distributed by an air gun connected to the unregulated air intake 15, and the final painting of surfaces.

According to a characteristic of the invention, the process consists, at the start of the operations, of automatically switching on the ventilation group by overpressure 3.

According to another characteristic of the invention, the method also consists in preventing an operation of any of the preparation devices or of the radiation drying means 7 as soon as the disconnectable paint equipment 6 is connected to the distribution satellite of energy and control 5 and to concentrate ventilation on the only work station 2 on which painting is carried out. To this end, the satellite 5 is provided, at the air intakes 19 and 20 for connecting the disconnectable paint equipment 6, with air flow detectors connected to an interruption control of all of the other ways to distribution of energy to the accessories of all the satellites 5, with the exception of the overpressure ventilation group 3, and to the control of the valves 8 'of the plenums 9. This interruption command, actuated by the detectors, is all or nothing type, that is to say that it does not allow any of the accessory devices and the radiation drying means to operate, and that it automatically switches the ventilation air supply above the work station 2 concerned, by controlling the valves 8 '.

In addition, according to another characteristic of the invention, the method also consists in automatically carrying out an operation control of the overpressure ventilation group 3 in the polluted air extraction mode with prohibition of any operation, as soon as the painting operation using disconnectable painting equipment (6).

Figures 4 to 15 of the accompanying drawings show different possible embodiments of the ventilation unit 3, respectively in positions of exhaust air, recirculation of air with renewal and recirculation of total air, in relation to the operation of disconnectable paint equipment 6.

According to a first alternative embodiment, represented in FIGS. 4 to 6, the ventilation unit 3, which is essentially constituted by a heating means 25, by a box 26 for blowing air towards the plenum, by prefilters 27 and by conduits 28 and 29, respectively for intake of fresh air and rejection of stale air, each equipped with a ventilation means with drive motor 28 "and 29", is provided at the conduits 28 and 29 of shut-off valves 28 ′ and 29 ′ and, on the conduits 28 and 29, respectively for suction of fresh air and rejection of stale air, distribution boxes 30 and 31 and, between said conduits 28 and 29 , a bypass duct 32 provided with a bypass valve 33. Thus, in a paint configuration shown in FIG. 4 of the accompanying drawings, the fresh air sucked through the conduit 28, in the valve open position 28 ', goes through the distribution box 30, the prefilters 27 and the blowing box 26 to be propelled into the plenum and towards the corresponding work station.

Simultaneously, the air coming from said work station is sucked through the grating 12 of the box 11 (FIG. 1) by the bottom of the distribution box 31 connected to the exhaust air discharge duct 29 and evacuated to outside through the valve 29 'in the open position, the bypass valve 33 being closed.

During the other preparation operations, the ventilation unit 3 operates in the configuration shown in FIG. 5 of the appended drawings, namely a configuration allowing energy saving and in which the air coming from the work station (s) is sucked through the grating 12 of the box 11 (Figure 1) from the bottom of the distribution box 31 connected to the exhaust air discharge duct 29 and is recirculated to the plenum by passage in the duct 28 through the bypass valve 33 open and the distribution box 30, the prefilters 27, the heating means 25 and the blowing box 26, the closing valves 28 'and 29' of the conduits 28 and 29 being closed.

During operation in the two aforementioned configurations, the ventilation means with drive motor 28 "and 29" equipping the conduits 28 and 29 are on.

During a drying phase (Figure 6), the air from the workstation (s) is sucked through the grating 12 of the box 11 (Figure 1) from the bottom of the distribution box 31 and follows the same path as that described in connection with FIG. 5. Furthermore, in this configuration, the heating means 25 is running while the drive motor 29 "of the ventilation means equipping the duct 29 is stopped, so that the the air recycled through the heating means 25 is heated to promote the drying process.

Figures 7 to 9 of the accompanying drawings show an alternative embodiment of the ventilation group, in which the ducts 28 and 29 respectively for air intake 9 and exhaust of stale air are connected to distribution boxes 30 and 31 , these boxes being provided with valves 30'-31 'and 30 "-31" opening respectively on the side of the inlet of the suction duct 28 and on the side of the air intake which is connected to the work station through the grating 12 of the box 11 (Figure 1).

Thus, in a paint configuration represented in FIG. 7 of the accompanying drawings, the fresh air sucked through the duct 28, in the open position of the valve 30 'in the distribution box 30 and through the prefilters 27 and the blowing box 26 to be propelled into the plenum and to the corresponding work station.

Simultaneously, the air coming from said work station is sucked through the grating 12 of the box 11 (FIG. 1) from the bottom of the distribution box 31 through the valve 31 "in the open position and discharged to the outside through the exhaust air discharge duct 29 connected to said distribution box 31, the valve 31 'being closed.

Figure 8 of the accompanying drawings shows an operating configuration in energy saving mode, in which the air from the workstation (s) is sucked through the grating 12 of the box 11 (Figure 1) from below distribution box 30 connected to the fresh air suction duct 28 through the valve 30 "in the open position and is recirculated to the plenum by passage through the prefilters 27, the heating means 25 and the blowing box 26, the valves 30 'and 31 "being closed, while the fresh air sucked through the duct 28 passes through the open valve 31' of the distribution box 31 and said box 31, directly in the pipe 29 exhaust air discharge.

In the two operating modes described above, the drive motors 28 "and 29" of the ventilation means operate in an identical manner to that described in connection with FIGS. 4 and 5.

FIG. 9 represents the ventilation group 3 in operation in the drying phase. The air from the workstation (s) is sucked through the grating 12 of the box 11 (FIG. 1) from the bottom of the distribution box 30 through the valve 30 "in the open position and follows the same path as that described with regard to FIG. 8. Furthermore, in this configuration, the heating means 25 is running while the drive motor 29 "of the ventilation means equipping the duct 29 is stopped, so that the air recycled through the heating means 25 is heated to promote the drying process.

Figures 10 to 12 show an alternative embodiment of the ventilation unit 3, according to Figures 7 to 9, in which the distribution box 30 is integrated in the duct 28 for suction of fresh air and the distribution box 31 is associated with the exhaust air discharge duct 29, the said distribution box 31 being connected, by its end opposite to that of the return of the stale air, to the inlet of the fresh air suction duct 28, by the through a connection duct 34, with interposition of a valve 31 '.

Thus, in a paint configuration represented in FIG. 10 of the accompanying drawings, the fresh air sucked through the duct 28, in the open position of the valve 30 ′, passes through the distribution box 30, the prefilters 27, the heating means 25 and the blowing box 26 to be propelled into the plenum and to the corresponding work station.

Simultaneously, the air coming from said work station is sucked through the grating 12 of the box 11 (FIG. 1) from the bottom of the distribution box 31 through the valve 31 "in the open position and evacuated outside through the exhaust air discharge duct 29 connected to said distribution box 31, the valve 31 'being closed.

During the other preparation operations, the ventilation unit 3 operates in an energy-saving configuration, in which the air coming from the work station (s) is sucked through the grating 12 of the box 11 (FIG. 1) from the bottom of the distribution box 30 and is recirculated to the plenum through the prefilters 27, the heating means 25 and the blowing box 26, the valves 30 'and 31 "being closed, while the fresh air sucked through the duct 28 passes through the connection duct 34, the open valve 31 'of the distribution box 31 and said box 31, directly in the duct 29 for rejecting stale air.

During a drying phase (FIG. 12), the operation of ventilation group 3 is identical to that described with regard to ventilation group 3 according to FIG. 9.

FIGS. 13 to 15 represent another alternative embodiment of the ventilation group 3, simplified, in which the conduits 28 and 29, respectively for suction of fresh air and rejection of stale air, are completely independent by construction and integrate each a distribution box 30 and 31 provided at its ends with valves 30'-30 "and 31'-31", the exhaust air discharge duct being devoid of a ventilation means.

Thus, in a paint configuration shown in Figure 13 of the accompanying drawings, the fresh air is treated in an identical manner to that described with reference to Figure 10 above.

Simultaneously, the air coming from said work station is sucked through the grating 12 of the box 11 (FIG. 1) from the bottom of the distribution box 31 through the valves 31 'and 31 ".

During the other preparation operations (FIG. 14) and during the drying phase (FIG. 15), this ventilation group 3 operates in an identical manner to that according to the embodiment of FIGS. 11 and 12.

Furthermore, and in a known manner, the enclosure 1 is provided with a control and electrical protection box, not shown, ensuring control and optimal use of the cabin and all the servo and safety means.

Finally, the prefilters and filters of the plenums 9 and the filters of the gratings 12 are each advantageously connected to a pressure switch or to a pressure gauge making it possible, by monitoring the air pressure prevailing at the level of these elements, to detect their degree of clogging and to thus plan the interventions possibly necessary.

Thus, the method according to the invention makes it possible to prevent any production of dust pollution during the painting phase and also avoids any risk of ignition of the solvents by a spark due to an electrical device. As a result, the booth according to the invention meets the standards and recommendations applying to paint booths.

The method according to the invention implemented with the cabin described above makes it possible to guarantee an operation which does not depend on manual intervention by the operator, the use of the various tools or accessories automatically triggering operating phases. and which may prohibit the simultaneous conduct of certain operations.

In addition, during a priming or painting operation, all the ventilation is concentrated on one station and all the devices that may present a risk of dust pollution or deflagration following an electric spark are automatically cut.

Finally, an external thermostat can be provided to carry out an assisted control of the air distribution and its possible recycling.

Thanks to the invention, it is possible to produce a booth for preparing surfaces to be painted and painting these surfaces in the same enclosure making it possible to carry out all of the operations for treating an object to be treated in one place and without moving said object, by optimizing the various operations. This results in a significant gain in productivity, because the handling times which have existed until now between the different operations carried out on different stations are eliminated.

In addition, the object can be treated safely by the user, in a relatively small space and in full compliance with the standards and recommendations in force.

Finally, the method and the cabin according to the invention allow a significant improvement in ergonomics compared to cabins known to date, so that the quality of the work performed is also improved.

The invention has been described in connection with a cabin more particularly suited to the field of automobile repair. However, the invention is also applicable for the surface treatment of other objects.

Of course, the invention is not limited to the embodiment described and shown in the accompanying drawings. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without thereby departing from the scope of protection of the invention.

Claims (18)

Process for the preparation of surfaces to be painted and for painting of these surfaces, characterized in that it consists in carrying out all the preparation and painting operations in the same closed enclosure (1), under a slight air pressure, without movement of the object to be treated, the painting operations triggering an impossibility of implementing all the other preparation and drying operations. Method according to claim 1, characterized in that , at the start of the operations, it consists in automatically switching on an overpressure ventilation. Method according to claim 1, characterized in that it consists in preventing the operation of any of the preparation devices or of a drying means as soon as a painting operation is carried out and in concentrating the ventilation on the only work station (2) on which painting is carried out. Method according to any one of Claims 1 and 3, characterized in that it consists in automatically carrying out an operation control of the overpressure ventilation group (3) in the polluted air extraction mode with prohibition of all operation, from the start of a painting operation. Cabin for implementing the method according to any one of Claims 1 to 4, essentially in the form of a closed enclosure (1), characterized in that it comprises at least one work station (2), a single overpressure ventilation group (3), at least one lifting table (4), at least one satellite (5) for energy distribution and control for the tools necessary for carrying out the various operations, per workstation (2), by at least one disconnectable painting equipment (6) and by at least one radiation drying means (7). Cabin according to claim 5, characterized in that the single overpressure ventilation group (3) is connected to the enclosure (1), on the one hand, via blowing ducts (8) to at least a plenum (9) extending above the work station (2) and, on the other hand, by means of extraction ducts (10) to at least one box (11) provided with a grating (12), the blowing (8) and extraction (10) conduits each being provided with a corresponding valve (8 'and 10'). Cabin according to claim 6, characterized in that each energy distribution and control satellite (5) for the tools necessary for carrying out the various operations is in the form of a box mounted on the wall of the enclosure (1) and connected to the means of distributing electrical and pneumatic energy, this box comprising on the front face the necessary connection means, namely at least one electrical outlet (13), a regulated air outlet (14) , an unregulated air intake (15), a device (16) for adjusting the air pressure of the regulated air intake (14), a pressure gauge (17), a suction outlet (18) sanding dust, a set (19 to 22) of air intakes (19, 20) for spraying and controlling a disconnectable paint equipment (6), regulating (21) of the spraying pressure and manometer (22) for controlling the spraying pressure and by a control valve (23) from the sanding dust intake (18). Cabin according to claim 5, characterized in that the single overpressure ventilation group (3) is further provided, in the case of construction of the enclosure with several work stations, of a reversing valve (24) control of the suction circuit, intended to allow operation with total air renewal or recirculated air in cold periods, as well as to make a preferred operating choice of the single overpressure ventilation group (3) in connection with a work station (2). Cabin according to either of Claims 5 and 8, characterized in that the ventilation unit (3), which is essentially constituted by a heating means (25), by a box (26) for blowing air to the plenum, by prefilters (27) and by ducts (28 and 29), respectively for the intake of fresh air and the rejection of stale air, each equipped with a means of ventilation with drive motor (28 "and 29"), is provided, at the conduits (28 and 29) with closing valves (28 'and 29') and, on the conduits (28 and 29), respectively with fresh air suction and rejection of stale air, distribution boxes (30 and 31) and, between said conduits (28 and 29), a bypass conduit (32) provided with a bypass valve (33). Cabin according to either of Claims 5 and 8, characterized in that the ventilation unit (3), which is essentially constituted by a heating means (25), by a blowing box (26) d air to the plenum, by prefilters (27) and by conduits (28 and 29), respectively of intake of fresh air and rejection of stale air, each equipped with a means of ventilation with motor drive (28 "and 29"), has ducts (28 and 29) for air intake (9) and exhaust air respectively, which are connected to distribution boxes (30 and 31), these boxes being provided with valves (30'-31 'and 30 "-31") opening respectively on the side of the inlet of the suction duct (28) and on the side of the air intake which is connected to the work station through the grating (12) of the box (11). Cabin according to claim 10, characterized in that the distribution box (30) is integrated in the fresh air intake duct (28) and the distribution box (31) is associated with the exhaust duct (29) stale air, said distribution box (31) being connected, by its end opposite to that of stale air intake, to the inlet of the duct (28) for sucking in fresh air, via 'a connection conduit (34), with interposition of a valve (31'). Cabin according to either of Claims 5 and 8, characterized in that the ventilation unit (3), which is essentially constituted by a heating means (25), by a blowing box (26) d air to the plenum, by prefilters (27) and by conduits (28 and 29), respectively of intake of fresh air and rejection of stale air, each equipped with a means of ventilation with motor drive (28 "and 29"), has ducts (28 and 29), respectively for fresh air suction and exhaust air discharge, which are completely independent by construction and each integrate a distribution box (30 and 31) provided at its ends with valves (30'-30 "and 31'-31"), the exhaust air discharge duct being devoid of ventilation means. Cabin according to claim 5, characterized in that the radiation drying means (7) consists of at least one ramp with infrared or ultraviolet radiation and is mounted in the enclosure (1) in a movable manner along a horizontal through axis the whole enclosure (1) under the plenum (9). Cabin according to claim 13, characterized in that the radiation drying means (7) is adjustable in position relative to the plenum (9). Cabin according to claim 5, characterized in that the enclosure (1) proper is produced in the form of a fully closed sheet steel carcass and provided with rigid or flexible access doors in the form of curtains made of a material with fire resistance of M0 quality. Cabin according to claim 15, characterized in that the enclosure (1) is further provided with multiple light sources, a pre-filter on the air intake and diffusing filters in the plenum (s) (9) to stop the introduction of dust into the enclosure (1) and of an extraction filter under the grating (s) (12), in order to retain the primer or paint pigments before rejection of the air to the atmosphere. Cabin according to claim 8, characterized in that each satellite (5) is provided, at the air intakes (19 and 20) for connection of the disconnectable paint equipment (6), with flow detectors. air connected to a command to interrupt all of the other means of energy distribution to the accessories of all the satellites (5), with the exception of the overpressure ventilation group (3), and to the command valves (8 ') of the plenums (9). Cabin according to claim 15, characterized in that the prefilters of the plenums (9) and the filters of the gratings (12) are each connected to a pressure switch or to a pressure gauge allowing, by monitoring the air pressure prevailing at these elements, to detect their degree of clogging and thus to plan any interventions that may be necessary.

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