SE527892C2 - Forming air flow - Google Patents

Abstract

Arrangement for coating a surface with particles comprising a housing (3) with a spindle shaft (4) bearing a means delivering the particles in the form of a conical bell (8) with a charging potential higher than that of the object to be coated with the particles, a shaping airflow (10) being established to sweep over the outside of the bell (8) essentially axially in the direction of the object. The arrangement is characterized by that a guide vane element (28) is arranged so as partly to surround at a distance the bell (8) and the housing (3) adjacent to outlets (9) of the housing (3), from which the shaping airflow (10) is blown out.

Description

0 '! N) * Q G) \ O k) 2 avmuuunmruaumspuueumnuwum al AOH al hnbhfßfdewcawvl al lw mmounmaguanaeneffomefmmmmifwnavuyaanmovawaam aewmwauespuwumwnnnaummpsenmumumpawmwomm kapacletclcavßw-in fl wodnüntämmvsensñmifaal al mrbrnmvlfetav pmldblædülmumlslærgonoma fi øiuatyddaletlwmhenjndielaavde al alrm mwsemunbnwmmgerenumuwmummwununmmapsmmæ bnpuihßstvn al læirmdßr fi shnføra flfl ïiduaomhu al ohlbnka al enæmrnm nuymvummmmnnmmpawmnæmmuunanuvæsafalmmpuu- tnmmhgunlvmfmdßrnhblühgiodnlrwfnbnavhlbiumvlætlanâwl flfi dsumpn al ñaow al nIGuLFNalædlmradesßa avsphd0h. Manmmauummmummamnwuasammønuuuunpuwfmmm ochhomhordmsuu al unmdvmë al YWE al gaæunblunnndmvämnhgavmußw fumrmuunummnbaumafwagvummmdunuwuynummumuw »denenuglaomiall al hairy al lmutlålar.

Motb al qrumavdepmbbmæmarßrhüppadonndmàhkmwl al hrddvmav hmmrbhharßnbkgjomaübtàldd al wsådaæsgü al hrmoddddrbknubr al urmßàrm màhhgsnphddavtwweeüdaguudmdv al ylhnñmm al mmbctmmvletnndfbr aünñiniusspündehrrádagørassáibrvodwlüaomnnñ fi gtibrdtñlaà al wnmoda uuvmøemavu rnaung. Deesum nam màlmwvlvden van om: nu manen. utiderhällaodihandfu.

As mentioned to be the forming Iu fi strómmcn high speed hizvudsakligen - 'f mdalmdnihingsßodam iralisuiwuimmeddmebwodddæhdbnwhmade avmaumuuumfargmmmmøupmeommmmomiumunaem wummmm al nhnmdalnldunw fi Nwar al damnutobieh fi àrqheke al ewmmmupp- stkalvbsvhwbildlüqlzhr al rtbdwuñrdmblmudà al lmshbunnnlpådess utídaodlüwnndabdmm fi vmdal flfl nenwwbldünlømliarmhlldußn fi LVM dnmdsigßmpartldansomdáwldlcarnavsâhsigpåammhuuuutsida.

Fómbgafldemp fi mhgaweraüe fl elcßvtamindadefafuwandelllsuñmnnßr aünhdueßuehhuanavndavweb fi nimße fl atnßløtgunma fi upplimiugm erhà fi deiplhn fl uavuxangiwxaalrdlngm. lßflvdlaanduymmnnrmmhrmsphdundafoqanueuumsmhenm beak fi vasnâmnloldøhlunderhârnvhnlvgtldmhwgemsomvlsart Hwuamn fl mmmmvuanaenavmmmmumuppwuuem måhiwnhdel. fl lllrie fl sdsenualisßmlügenomennaàhmssplfndelmhtuppfhxnivguv, * hur Menmálnhgsldodaaedd fi àrwdessuautmæharxshatazadesidaoclw fl lwßeülil fl diütgumnnüülgddodunodlspiddndmddda fl. 10 15 20 25 II OOII ID O '0 0 oo U UIQ D! Q o o n. o nu one b) 0 00 o figure 4 a section along the line N-N in figure 2, but only of rotor and stator. tiga.- 5 and 5 two. different embodiments of one housing end of the painting spider. figure 7 schematic vortex formation of air outside the grinding spindle, in its use, figure 8 a design for damping the vortex formation, figure 9 another design for damping the vortex formation, figure 10 schematic transfer of necessary energy and control information to the grinding spindle, figure 11 an external pile in place of a protective transformer, Figure 12 schematically shows another design of the transmission of single control information to the grinding spindle, Figure 13 combined mounting bolt and electrical connection, Figure 14 combined air connection and electrical connection, Figure 15 shows a cross-section through the grinding spindle slightly outside a spindle 16 resp. 17 two different positions for a rotary axle member of the spindle shaft. Figure 1 schematically shows a robot 1 with a mesh spindle 2 mounted at the outer end of the outer robot arm, as is currently known in the art.

In Fig. 2, 3 denotes the spindle housing of a painting spindle, receiving a rotating shaft 4, which in turn receives a non-rotating tube 5. The rotating shaft 4 is mounted in the housing 3 with two radial air bearings 6 and in the example shown two axial outlet bearings 7 and supporting at one end. the left in the figure, a frustoconstricted funnel 8, so-called painting ball, which rotates together with the shaft 4. The stationary tube 5, which via a channel 5 a leads paint to the funnel 8, opens at the end of the rotating shaft 4 and inside at 8 o'clock, as shown by the clock. The shaft 4 normally rotates today between 6,000 and 130,000 rpm. 9 denotes lye channels arranged in the spindle housing, which generate a forming lute current 10, which causes the color particles ejected from the clock 8, upon its rotation, to deviate in the axial direction towards the object (not shown) to be painted. The object has a ground potential and the spindle with the color particles has a voltage potential relative to the object, lying in the range 30,000 to 130,000 volts, meaning that the color particles are attracted to the object to be painted.

The shaft 4 is driven by an electric motor consisting of stator shaft 11, stator winding 12 and a rotor 13 attached to the shaft 4. What has now been described belongs to known technology and should therefore need a more detailed explanation. In addition to mains connection via a protective transformer, which creates the required galvanic section between the different potential levels (30,000 to 13,000 volts), energy storage or energy creation can also be used as an energy source for the electrical generator. 0 U '' lk) \ JO) \ D h) Å oq din än; ... G I. I. 9 .nu .nu units, such as, for example, batteries, capacitors or fuel cells, galvanically separated from the 'clean, which should !! Feeding of a needle clock at the spindle shaft 1 Figure 38 shows in section the rotating spindle shaft 4 with the color tube 5 fixed therein. The painting claw 8 further has a sub-short-formed surface 16, cooperating with the sub-conjoined surface 14, and an external thread 17, cooperating with the threads 15 of the spindle shaft.

In order to prevent the grinding clock 8 from unintentionally detaching from the spindle shaft 4 at high rotational speeds, in accordance with the present invention, the threaded part 17 of the grinding clock 8 has been provided with axial slots 18 forming segments 19, in the case shown six segments. This meant that when the grinding clock is threaded onto the shaft 4, the threaded segments 19 of the watch 8 will spring radially inwards towards the threads and the gang edges of the threaded part 15 of the shaft 4, which meant that when the shaft 4 rotates, due to the centrifugal force the segments 19 to be forced outwards or to expand and the segments 19 of the grinding clock 8 to create a radially outwardly directed force, which in turn is transmitted to the cooperating gears 4 and 16, which also meant that an axial force is formed which causes the decompressed surfaces 14 and 16, respectively. locks' at each other.

The expansion due to the centrifugal force on the stepped segments 19 will hereby lock the painting bell 8 to the shaft 4 and prevent the painting bell 8 from coming loose during operation. The resilient properties of the threaded segments 19 will also ensure that the painting bell 8 is controlled in the locked position by the cone 16 resp. 14 and ei of the passages 15, 17, which reduces the tolerance requirements between the respective cone and thread of both the painting bell 8 and the spindle shaft 4.

Cooling of the stator When using an electric motor 11, 12, 13 (see figure 2), as the driving source for the spindle shaft 4, loss water is formed in the stator iron 11 of the motor, stator winding 12 and rotor 13, in addition to the heat generated by the friction losses. In order to e] risk the function of the spindle shaft 4, for example due to excessive heating and thus an e] manageable expansion, it is necessary to transport away a sufficiently large part of the formed loss lust, ie. cooling spider 4.

This is done by discharging the excess heat by means of the compressed air intended for the forming air streams 10 and supplied to the device. This compressed air, or at least a part thereof, is led according to the example shown in figure 2 through one or more channels 9 in the housing 3 to contact with the stator winding 12 of the electric motor. channels 20 thereof. Figure 4 shows a cross-section IV-N through the stator of Figure 2, wherein its windings are designated 12. Windings are provided with connecting through channels 20 for the passage of compressed air (molded air) through the stator and arranged, in accordance with this figure. , on the side of the windings facing away from the rotor 13, channels 20 can of course be located on the inside of the winding or between the winding wires in the respective winding sheath in $ W ° m ~. However, in order for the cooling air to leak out to the gap between the rotor and the stator, the stator is covered with a leak-preventing liner 21 (see Figures 2 and 4).

The forming air stream 10 leaves the channels 20 in the stator 11 winding ends, indicated by the arrows at the ends of the phaloric winding 12 in Figure 2.

Proximity of the spindle shaft to the spindle housing without the formation of undefined radial loads on the spindle shaft 4, for which a torque is required during disassembly and reassembly of the watch, meaning that a counter torque is applied to the spindle shaft. This countermeasure is achieved today by applying a momerrtarrn - a pin - in spirdelaxefn. normally at its clockwise end, which pin is used manually or by means of a stop as an abutment. This means that during the applied torque of the removal and installation, the spindle shaft 4 will be subjected to a radial force fi during this work, which means that the spindle shaft 4 will support the bearing surfaces uncontrolled with uncontrolled bearing loads, which can thus cause damage to the bearings. Figs. 15-17 show a device in which the bearing surfaces will not be radially loaded uncontrollably by the spindle shaft 4 when applying the torque for the on or off clock 8, since the device is so shaped that the counter torque is transmitted to the radial plane XY but the path IJܧ §G between the rotation of the spindle housing 3 with the permission of free translation of the spindle shaft 4 in preventing rotation of the spindle shaft 4 relative to the spindle housing 3.

Said device comprises a locking washer 53 in the form of a ring, the inner diameter of which is slightly larger than the surface diameter of the spindle shaft 4. The lock washer 53 is provided with a first pair of interiors. diametrically opposed drive pins 54 and a pair of other diarnetrally relative outwardly directed drive pins 55, which are arranged perpendicular to the drive pins 54. The end of the spindle shaft 4 is provided with a number of grooves 56 (in the example shown in the figure eight grooves are provided). The grooves 56 are dimensioned so that they can receive the driver pins 54, while the other driver pins 55 are received in grooves 57 in the spindle housing 3. The lock washer 53 is limited to move in axial direction relative to the spindle shaft 4 in such a way that the driver pins 54 can be brought into and out of engagement in the grooves 56 while the carrier pins 55 are displaced in the grooves 57, compare Figures 16 and 17. Axially outside the lock washer 53 a semicircular strip-increasing yoke 58 is provided (yoke 58 is for clarifying the cut in tiger 16 and 1.7), fi kaså limited mobility in shoulder joint. The free ends of the yoke 58 engage on the outside of the lock washer 53, and according to the example shown on top of the other driver pins 55. By means of the yoke 58 the lock washer 53 can thus be moved axially between a position (see figure 16), in which the lock washer 53 of countersunk springs 59 are displaced so that the drive pins 54 are out of engagement with the spindle shaft, and a second position (see Figure 17) in which the lock washer 53 is kept depressed against the action of the springs 59 by the drive pins 54 and 55 in engagement with the spindle shaft grooves 56 and grooves 57 of the spindle housing 3 are actuated by means of an axial member displaceable towards a spring 60 by means of an axial member 61. 63.

When the actuator 61 of the breath 62 is held in the performed position according to Fig. 16, the locking washer 53 of the springs 59 is performed in the position in which the lowering pins go free from the grooves in the spindle shaft.

By pushing the actuator 61 towards the bead of the air 60, the lug 63 will be pressed upwards. while the yoke 58 pivots about an abutment 64 of the spindle housing, which abutment means that the yoke 58 acts as a lever, with the pivot point in the abutment 64, and thereby will press down the lock washer 53 so that the driver pins 54 engage in the grooves 56. The spindle axis is hereby prevented to rotate relative to the spindle housing but can move freely in the radial direction. If the actuator 61 is released, this is pushed out and the yoke with the locking jib 53 is moved by the force of the springs 59 out of engagement with said groove. The outward movement of the actuator 61 is, of course, appropriately limited. Protecting the outlet for radial bearings from being contaminated by paint A major problem today is that paint accumulates on the spindle shaft 4 (see Figures 2, 5, 6) at one or both radial air bearings 6, 6. This means that after a while it in the air acting on the radial bearing is prevented from freely meshing the bearing gap, which adversely affects the bearing capacity of the bearing as well as cooling, reducing the function and service life of the reducing spindle 2 in a decisive manner.

In order to prevent this accumulation of paint on the spindle shaft 4, interfering front and / or rear radial air bearings 6 resp. 6 function, is immediately outside the bearing or bearings and in connection with the bearing gap a chamber 22 is arranged, running around and with a gap 23 open towards the spindle shaft 4. The pressurized bearing air, which leaves the bearing gap and flows into the chamber 22, forms a certain overpressure therein, causing a smaller portion of the bearing air to act as barrier air and outflow into the gap between the spindle shaft 4 and the adjacent lip between the chamber 22 and a space 25, preventing paint from entering the chamber, while the bulk of the bearing air is diverted from the chamber to accepted manner (not shown), despite the fact that a harmful back pressure occurs at the bearings. 10 15 20 25 I I O 01 i \ J \ J G3 V) N) It is also conceivable to arrange an additional one outside the chamber 22 shown. as shown in frg. 6. Shielding air is supplied to the chamber 26 with a supernatant 26, pressure. This shielding air is drained partly to chamber 22 and partly to the space 25 (duct for supplying shielded air to chamber 26 is not shown).

In the embodiments where the spindle housing is elongated and encloses the grinding bell and a gap is formed between the outer periphery of the grinding bell and the spindle housing (see Figure 6), separate additional channels (not shown) can lead to the space 25, in order to achieve a desired pressure in space 25.

Surface treatment of the spindle shaft Another way than the one described above, or a complement to it, to alleviate that paint adheres and accumulates on the spindle shaft 4 (see figure 2) in connection with one or both radial air bearings 8, is that the spindle shaft 4 at least partially of its axial extent is coated with a surface coating, reducing the ability of the paint to adhere to the spindle shaft, which otherwise affects the outflow of the bearing air from the bearings 6, reducing the load capacity of the bearings as well as its cooling.

An example of a surface coating is tea fl on®.

Control of the Forming Air Pipe Tube (Figures 7, 8 and 9) According to the Invention Ili fl aßll ) arranged extending on the outside of the grinding spindle 2 and in connection with the clock 8 and the outlet 9 of the exhaust air 10 (cf. also Fig. 6) from the device. The guide rail means, shown as an example in Figure 8, controls the ambient air entrained by the flowing air 10 in a substantially laminar air flow over the bell 8, whereby the vortex bond 27 (Fig. 7) in connection with the outside of the bell 8 is damped or absent. The guide member 28 may have the shape of a continuous "ring" or be divided into several sections. 29 denotes support flanges for the guide rail member 28, which may suitably be two or more in number. The guide rail member 28 with its support flanges 29 'is mounted and disassembled from the spindle housing 3 in the axial direction, the support lugs 29 are snapped onto the spindle housing 3 in the recesses which are in connection with the spindle mounting screws (not shown).

Figure 9 shows an embodiment, in which a filling 30 is arranged as an integrated extension of the spindle housing 3 extending over the periphery of the bell 8. whereby a more even air radiation of the air entrained by the flowing air stream is obtained in the transition from house to doll, in comparison with the design according to Figure 8. The filling 30 has an outer shape which is suitably shaped to connect to the inside of the guide rail member 28. 10 15 20 25 .O. .no. oss: .oo 0 l I o Ina we. 'z- ä. ooo 0:00:' g-'ê ëà G1 N) \ J OD Arrangement of axial air bearings In order to achieve as short and compact a painting spire part and thus painting equipment as possible, which is of great importance for facilitating its use, the location of the usually two axial air layers is of great importance.

An optimal solution is to arrange the two thrust bearings 7 (see figure 2) on each side of and in connection with the rotor 13 on the spindle shaft 4. At the same time as the installation of the thrust bearings 7 becomes compact, the rotor will offer a natural support for the thrust bearings in the axial Special, spindle shaft 4 extending installation measures for the axial alloy bearings are not necessary.

By using single-acting axial bearings, where the axial opposing force is produced by a magnetic field (design not shown). When the axial air bearing is not in operation, the surface against which the shaft is pressed by the magnetic field can be used as a friction surface, in order to slow down the rotation of the spindle shaft.

Coding of target components Increasingly, it is common practice to use pirated components together with an original product. This is in some cases difficult and can have devastating consequences if the pirated component does not maintain the quality (dimensions, choice of materials, etc.) required of an original product.

In order to prevent the use of a pirated painting spindle 2 (see Figure 2), for example when replacing an original original spindle of an original device according to the invention, it is provided that the cleaning spindles manufactured are provided with a code which is read by the device's control equipment and it is possible that only a correctly coded painting spindle 2 can be used in the original device. Lack of code or incorrect code means that the control spindle's control equipment reacts and makes the device unusable, for example by disconnecting the electric motor's power supply.

By coding the grinding spindle, it is also possible to follow and collect data during the operation of the device and from this data obtain one in order to increase the product's reliability and performance. This can be done, for example, by identifying each painting spider individual and via a control system, included in the device, and data is sent to a spire monitoring system at the supplier, whereby historical operating data for this spider individual can be collected.

Speed control of the spindle, see figures 10, 11, 12 An electric motor-driven spindle of the type referred to here is normally supported at the outer end of the amine of a painting robot, as shown in Figure 1. With regard to the rapid movement of the robot arm and associated torques , there is an effort to minimize the weight of the grinding spindle 2. 10 15 20 01 l \> \ Il '231. e 9 geo 0_o_e 3 _ I fi g. 12 denotes 32 an alternating current cold source, the frequency of which is changeable.

Den frán. the current source 32 supplied with the alternating current is led to a protection transformer 33, in which the alternating current is converted into a low-voltage direct current, for example 40 V, which direct current will contain a superimposed frequency which is proportional to the frequency at which the motor is to be speed controlled. This frequency is detected by a control electronics 34 integrated in the milling spindle (see also Figures 13, 14), where the direct current is converted using the superimposed alternating voltage to the desired supply frequency, which brings the electric motor (11, 12, 13) of the pinioning coil part 2 (see to rotate at the desired speed.

The advantage of connecting the protection transformer 33 in the network before the control unit 34 is that the cloud transformer as can be wired at a certain frequency than the desired one. This in turn means that the transformer atom can be made compact, ie. with less volume and less weight, then as shown in Figure 11 it is desirable to place the protective transformer 33 in the robot. Of course, it is also possible to assemble the transformer 33 and the control unit 32 into a single unit if desired. Information between the current source and the motor control, in order to achieve the desired driving characteristics, such as acceleration, deceleration and speed, takes place by communication with units connected to the transformer's primary resp. secondary side via information transmitted via light, sound, radio communication or information in the transmitted energy or a combination thereof. The rotational speed can, for example, be read optically or via sound impulses, which can be used without affecting the requirement for electrical insulation.

The protective transformer 33 is suitably supplied with an alternating voltage, the frequency of which is a multiple of the desired speed on the spindle shaft 4, for example 12-9 times the speed.

This makes it possible to minimize the physical size and weight of the transponder. The alternating voltage obtained in the control electronics (indicated by reference 34 in Figure 12) must have a frequency which is a factor lower than the frequency at which the protection transformer 33 is fed, in order to constitute the desired frequency for driving the spindle shaft 4 with the desired the speed.

By varying the frequency of the growth current supplied from the current source 32 to the protection transformer 33, the speed of the spindle shaft 4 can thus be changed.

Figure 10 schematically shows a configuration which, in contrast to that shown in Figure 12, has the control electronics 35 and the power supply unit 32 located next to the robot, while the three protection transformers 33 are located in the robot and which in this embodiment will operate at the desired frequency of the motor and thereby become significantly heavier.

Figure 12 shows an embodiment in which the control electronics 34 are built into the housing itself of the grinding spindle 2. The current source 32 shown in the figure and the protective transformer 33 can of course be built into a unit. 10 15 20 25 O: coon: çäz (å) Use of connection means for electrical connection An electric motor-driven spindle requires for its functional electrical connections for motor operation (usually 3-phase and thus three connections, for control electronics integrated in the spindle 2 connections for direct current ), as well as connections for cooling air and forming air. In addition, bolts are required for mounting the grinding spindle to the spirit of a robot tooth. In the case of three mounting bolts, the manipulation of three electrical connections, a cable for control information, two cable connections and three bolt connections is thus required when renovating or replacing the grinding spindle.

These eight, separate connections meant that when removing and dismantling the installation mirror on the single-robot, it was unnecessary. time consuming work. The intention is therefore to reduce the number of connections and allow the mounting bolts to also serve as electrical connections or the air connections to also serve as electrical connections or a combination where both the mounting bolt and the wiring harness can serve as simultaneous electrical connection.

Figure 13 schematically shows a painting spindle, which by means of, for example, three mounting bolts 36 (only one shown) is mounted at, for example, a robot arm via a mounting flange 31 attached to the arm. a bronze nut 38 is received, by means of an insulation 39 galvanically separated from the cradles 37 of the recess 37 and formed from the mounting flange 31. With its skull 40 in a shoulder of the paint spindle housing 3 supporting mounting screw 36 extends insulated through the housing 3 and is fixed in the bronze nut 38. With the nut 38, an electrical cable 41 (one of the conductors) is electrically connected. By 34 is indicated sohemically in the drawing the motor control electron, which in the example shown receives its current by means of an electrically conductive bridge 42, which is electrically insulated (indicated by reference numeral 44 in Figure 13) from the grinding spindle housing 3 but which on the one hand is electrically conductive the head 40 of the mounting bolt 36 and on the other side by means of a screw 43 which, in the example shown, extends through the control electronics 34 and threaded electrically conductively holds the bridge 42.

In case the mounting bolts of the paint spindle 3 are formed in the manner described, it will be readily appreciated that mounting and disassembly of the needle spigot from the mounting lance 3 is easily accomplished by loosening only the bolts 36, or the air connection rigs (not shown) being flat surfaces tatt. Figure 14 shows how, in a corresponding manner, an air connection also constitutes the electrical connection to the control electronics' control electronics and motor. The lead in the grinding spindle is denoted by 45. As described in connection with Figure 1.4, the mounting shaft 31 is also provided with a recess 37. The recess 37 is fitted with a first bushing 39. The bushing 39 is insulated and the electrically conductive first sleeve 46 insulates from the mounting.

To this sleeve 46 is electrically connected an electrical cable 47. 10 15 20 25 (31 N) \ J 00 \ O N) n a I 0 q now I 0 0 0 e 00 I 0 I I 1 a I ao 0000, a o e. o an: e I co de ae 000: ett a -Q .A ae U 'a noget conductive sleeve 49, which by means of an electric cable 50 is electrically connected to the control electronics 34 or motor of the grinding spindle.

The air line 45 as well as the air line 51 connected to the mounting shaft 3 consist of, for example, electrically non-conductive hoses, which respectively partially extend into a hole through a bushing 46, 49, as shown in figure 14. Between the respective hose 51 and 45 spirits in the bushes 46 and 49 the through hole of the bushings has a smaller diameter, which corresponds to the inner diameters of the hoses and thus the bushings 46 and 49 themselves form part of the discharge line. Between the conductive contact surface of the bushings 46 and 49 with each other, around the curved hole, a sealing ring is arranged, holding air lacquer. The l-thigh shows that as soon as the measuring spindle is mounted on the mounting shaft 31, the simultaneous connection of the painting spindle to air and electricity is automatically obtained. n en en 0 I n ae q n o e e o noe en

Claims (4)

10 15 Claims 1 \> \ J OO \ O I \> 12 Patent claims A device for coating a surface on particles comprising a housing (3) a spindle shaft (4) rotating therein supporting a particle emitting member in the form of a convex bell (8) with a charging potential higher than that of the object to be coated with particles. wherein a forming air stream (10) is arranged to substantially axially coat the outside of the bell (8) in the direction of the object, characterized in that a guide rail element (28) is fixedly arranged on the housing (3) to partially enclose the bell ( 8) and the housing (3) in connection with the outlet (9) of the housing (3), from which the forming air flow (10) is blown out. Device according to claim 1, characterized in that the guide rail element (28) is continuously formed. Device according to claim 1, characterized in that the guide rail element (28) is divided into segments, annularly distributed around the device (20). Device according to one of the preceding claims, characterized in that the housing (3) partially axially encloses the outside of the paint bell (8) and has a shape extension which, at a radial distance, substantially connects to the inner dimension extension of the guide rail element (28).