Rotary sprayer

Abstract

The present invention relates to a rotary sprayer (1) for spraying a coating agent (e.g., paint) using rotating rotors (2, 5), and comprises a fixed magnetic sensor (6) for detecting changes in the pole of a magnet (5) that rotates with the rotating rotors (2, 5). The magnetic sensor (6) is positioned within a detection range around the magnet (5) so that the magnetic sensor (6) can detect the rotating changes in the pole of the magnetic field. In order to avoid interference of induced currents within the detection range, the present invention provides a high resistivity (1 Ω mm) within the detection range around the rotating magnet (5). 2 / m or more, 0.5Ωmm 2 / m or more, or 0.1Ωmm 2 Only electrically low conductive materials with a resistivity of 1 Ω / mm or more are placed, and / or low resistivity (1 Ω / mm). 2 Less than / m, 0.5Ωmm 2 Less than / m, or 0.1Ωmm 2 The invention is characterized in that an electrically conductive material having a length of less than / m is placed only outside the detection range around the rotating magnet (5).

Description

[Technical Field]

[0001] The present invention relates to a rotary sprayer for spraying coating agents, and more particularly to a rotary sprayer for spraying paint for painting automobile body parts. [Background technology]

[0002] In modern automotive painting equipment, rotary sprayers are typically used as the coating device. When using such rotary sprayers, it is desirable to determine the rotational speed and direction of the rotary sprayer so that the rotational speed can be controlled using open-loop or closed-loop control.

[0003] Patent Document 1 discloses a rotary sprayer that allows monitoring of the rotational speed and direction of rotation of the rotary sprayer during operation. For this purpose, known rotary sprayers are equipped with a rotating reflector that is scanned by an optical sensor. However, a drawback of this optical speed detection is that it is susceptible to interference from dirt on the reflector.

[0004] Furthermore, a conventional technique involves acoustically determining the rotational speed of a rotary sprayer by detecting its operating noise. However, this acoustic velocity detection is also susceptible to interference. For example, ambient noise generated while a rotary sprayer is operating within a painting facility can interfere with acoustic velocity measurement.

[0005] Finally, Patent Document 2 describes a method for measuring the rotational speed of a rotary sprayer using a Wiegand sensor (pulse wire sensor) that detects the changing poles of a rotating magnetic disk. However, although the technical and physical reasons for the susceptibility of speed measurement using a Wiegand sensor to interference have not yet been fully elucidated, this speed measurement method using a Wiegand sensor is also susceptible to interference.

[0006] Finally, for a general technical background of the present invention, please refer to Patent Documents 3, 4, and 5. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] German Patent Application Publication No. 10237128 [Patent Document 2] German Patent Application Publication No. 102021101028 [Patent Document 3] International Publication No. 2022 / 157098 [Patent Document 4] Japanese Patent Publication No. 2018-58015 [Patent Document 5] European Patent Publication No. 2383546 [Overview of the project] [Problems that the invention aims to solve]

[0008] Therefore, the present invention is based on the problem of improving speed detection in rotary sprayers. [Means for solving the problem]

[0009] This problem is solved by the rotary sprayer according to the main claim.

[0010] Similar to known rotary sprayers, the rotary sprayer of the present invention first comprises a rotatably mounted rotor that rotates at a predetermined rotational speed during operation around a rotation axis. In a preferred embodiment of the present invention, the rotor comprises a sprayer shaft having a bell cup mounting option at its distal end, for example, a threaded connection for screwing a bell cup onto the sprayer shaft.

[0011] Furthermore, like the conventional rotary sprayer with Wiegand sensor described above, the rotary sprayer of the present invention also includes a magnet (e.g., a magnetic disk) that rotates with the rotor, and this magnet has multiple magnetic poles distributed on its circumference, and therefore the magnetic poles change in the circumferential direction.

[0012] Furthermore, the rotary atomizer according to the present invention also includes a magnetic sensor (e.g., a Weigand sensor) for detecting the change in the poles of the magnetic field of a magnet that rotates together with a rotating rotor. Since the magnetic sensor is disposed within the detection range around the magnet, the magnetic sensor can detect the rotating change in the poles of the magnetic field.

[0013] The present invention is based on newly obtained technical-physical findings that the rotating change in the poles of the magnetic field within the material of the rotary atomizer generates eddy currents and induces a counter magnetic field that interferes with the speed measurement by a magnetic sensor (e.g., a Weigand sensor). Therefore, at the position of the magnetic sensor (e.g., a Weigand sensor), the useful signal resulting from the rotating change in the poles of the rotating magnet is superimposed on the interference signal generated by the induced counter magnetic field. For this reason, the present invention provides for reducing these interfering eddy currents and counter magnetic fields in order to reduce the influence on the interference of speed detection.

[0014] Therefore, in the rotary atomizer of the present invention, within the detection range around the rotating magnet, only a material having a preferably high specific resistance and low electrical conductivity is disposed in order to avoid the interfering induced current within the detection range, and the specific resistance is 1 Ωmm 2 / m or more, 0.5 Ωmm 2 / m or more, or 0.1 Ωmm 2 / m or more.

[0015] On the other hand, outside the detection range, the rotary atomizer according to the present invention can also include a material having a low specific resistance and high electrical conductivity of less than 1 Ωmm 2 / m, less than 0.5 Ωmm 2 / m, or less than 0.1 Ωmm 2 / m.

[0016] Therefore, the rotary atomizer of the present invention is preferably characterized by a mixture of materials, and the mixture of materials within the detection range around the rotating magnet is a material having low electrical conductivity (e.g., ρ > 0.1 Ωmm 2Provides a magnetic field (ρ≦0.1Ωmm) outside the detection range around the rotating magnet, while providing an electrically conductive material (e.g., ρ≦0.1Ωmm) 2 The advantage lies in its ability to provide ( / m). This is the same as with conventional rotary sprayers.

[0017] Examples of electrically low conductive materials mentioned above include plastics, stainless steel, or titanium, but the present invention is not limited to these examples with respect to electrically low conductive materials.

[0018] In a preferred embodiment of the present invention, the stationary magnetic sensor is spatially isolated from the rotating magnet by an air gap, the width of which can be at least 0.1 mm, 0.5 mm, 1 mm, 2 mm, 5 mm, or 10 mm. The air gap completely prevents the induction of current and reverse magnetic fields in the air gap region because air is an electrical insulator.

[0019] Regarding the design of the rotating magnet, there are various possibilities within the scope of the present invention, and two of these modifications are described below.

[0020] In one modification of the present invention, the magnet is formed as a magnetic disk, which is positioned coaxially with the rotation axis and rotates with the rotor. For example, in one example, the magnetic disk of a rotary sprayer can be press-fitted onto the sprayer shaft. The magnetic sensor is preferably positioned near the rear of the magnetic disk in the axial direction and separated from the magnetic disk by the aforementioned air gap. Thus, in this modification, the magnetic field flows axially within the air gap. The axial length of the magnetic disk is much smaller than the radius of the magnetic disk. It should also be noted that at least one magnet should preferably be embedded in the end face of the magnetic disk. If the magnetic sensor is positioned near the front of the magnetic disk (i.e., on the side of the painting robot and away from the bell cup), at least one magnet is also embedded in the proximal end face of the magnetic disk.

[0021] However, in another modification of the present invention, the rotating magnet is formed as a magnet sleeve that can be crimped onto the sprayer shaft. The magnetic sensor (e.g., a Wiegand sensor) is radially separated from the rotating magnet sleeve by the aforementioned air gap. Thus, in this modification, the magnetic field is radial in principle in the air gap between one rotating magnet sleeve and the other stationary magnetic sensor. In this modification, the magnetic sensor is therefore preferably located radially outward from the magnet sleeve. With regard to the design of such a magnet sleeve, it should be noted that the magnet sleeve is hollow and its radial thickness is substantially small compared to the axial length and / or radius of the magnet sleeve.

[0022] In a preferred embodiment of the present invention, the magnetic sensor is positioned in an annular space extending circumferentially. For example, the annular space may extend over the entire circumference around the axis of rotation. However, in a preferred embodiment of the present invention, the annular space includes at least one slotted hole, which is curved circumferentially and extends over only a portion of the circumference. The magnetic sensor is positioned within this slotted hole, preferably centered with respect to the circumferential direction. This ensures that the magnetic sensor is surrounded by the slotted hole from both sides in the circumferential direction. It should also be noted that it is preferable that the magnetic sensor does not completely occupy the annular space (e.g., the slotted hole) in the radial direction, leaving a radial free space inside.

[0023] It is preferable to seal the annular space (e.g., an elongated hole) with an electrically insulating material. This prevents eddy currents from being generated within the electrically insulating material, thereby significantly preventing the induction of eddy currents and reverse magnetic fields around the magnetic sensor. Sealing the annular space (e.g., an elongated hole) with an electrically insulating material is also advantageous in that it avoids airflow turbulence that may occur in the annular space of the cavity and prevents mechanical force loss. For example, the electrically insulating material in the annular space may be plastic.

[0024] Furthermore, the present invention includes further inventive concepts of unique importance worthy of protection. For example, interfering eddy currents and magnetic reverse fields can be reduced by using a metal plate package consisting of a number of metal plates electrically insulated from one another. This prevents eddy currents from flowing in directions perpendicular to the metal plates. Such metal plates are known in transformers and therefore do not require further explanation. For example, the metal plate package may include 10 or more, 20 or more, 50 or more, or 70 or more metal plates electrically insulated from one another.

[0025] Magnetic sensors (e.g., Wiegand sensors) can be placed, at least partially, within a metal plate package, for example, within an axial hole in the metal plate package.

[0026] Furthermore, it should be noted that the individual metal plates constituting the metal plate package are preferably arranged in a plane containing the rotation axis of the rotary sprayer. Therefore, it is preferable that the individual metal plates are distributed circumferentially with respect to the rotation axis. Thus, it is preferable that the entire metal plate package be arranged coaxially and annularly with respect to the rotation axis of the rotor. To optimally suppress eddy current interference, it is also possible to provide slots in at least some of the plates of the metal plate package. The metal plates can be formed from so-called mu-metal, such mu-metal is known in the prior art. In general, it should be noted that adjacent metal plates of a metal plate package may be separated by an air gap, thereby allowing this air gap to be sealed with an electrically insulating material. Furthermore, with respect to the metal plate package, it should be noted that it is preferable that the metal plate package be arranged within the detection range around the magnet.

[0027] As already mentioned above, the present invention aims to minimize interference to velocity measurement due to induced reverse magnetic fields. Therefore, the magnetic field generated by the rotating magnet produces a useful signal with a first maximum magnetic field strength. On the other hand, the interfering reverse magnetic field generated by the induced current produces an interference signal with a second maximum magnetic field strength at the location of the magnetic sensor. The interference suppression means according to the present invention makes it possible to reduce the second maximum magnetic field strength (interference signal) of the interfering reverse magnetic field to preferably 30%, 20%, 10%, 5%, or even as little as 2% of the first maximum magnetic field strength of the useful signal generated by the rotating magnet. As a result, the structural measures according to the present invention improve the useful signal / interference signal ratio in magnetic velocity measurement.

[0028] It should also be noted that various orientations and arrangements of the magnetic sensor within the rotary sprayer are also possible within the scope of the present invention. For example, the magnetic sensor can be made elongated and its longitudinal axis can be positioned parallel to the rotation axis of the rotary sprayer. Alternatively, the magnetic sensor can be made elongated and its longitudinal axis can be positioned radially with respect to the rotation axis of the rotary sprayer.

[0029] Even in the axial arrangement of the magnetic sensor parallel to the rotation axis of the rotary sprayer mentioned above, various arrangements of the magnetic sensor are possible. For example, the magnetic sensor can be positioned close to the front of the magnetic disk in the axial direction, and the magnetic sensor and magnetic disk can be separated in the axial direction by an annular circumferential air gap. However, alternatively, the magnetic sensor can partially overlap the magnetic disk in the axial direction and be arranged radially on the circumference of the magnetic disk, outside the magnetic disk. In this case, the annular circumferential air gap separates the magnetic sensor and magnetic disk radially.

[0030] Even in the radial arrangement of the magnetic sensor described above, there are various possibilities for the arrangement of the magnetic sensor within the scope of the present invention. For example, the magnetic sensor can be placed proximal to the front of the magnetic disk in the axial direction, thereby the air gap separates the magnetic sensor and the magnetic disk in the axial direction. In this case, the magnetic sensor overlaps with the magnetic disk in the radial direction. However, alternatively, the radially arranged magnetic sensor can be placed on the circumference of the magnetic disk, which is arranged radially outside the magnetic disk, thereby the air gap separates the magnetic sensor and the magnetic disk in the radial direction.

[0031] As already mentioned above, the magnetic sensor is preferably a Wiegand sensor, which is known from the prior art (for example, Patent Document 2). Such a Wiegand sensor is also called a pulse wire sensor, and since it is known from the prior art, a detailed explanation is unnecessary. However, with respect to the type of magnetic sensor, the present invention is not limited to Wiegand sensors.

[0032] Furthermore, it should be noted that, generally, the rotor preferably includes a magnetic sensor as a separate component connected to the rotor in a fixed rotational state. For example, the magnetic sensor (e.g., a magnetic disk, a magnetic sleeve) can be press-fitted into the sprayer shaft, to name a few.

[0033] It should also be noted that, like conventional rotary sprayers, rotary sprayers may be equipped with a compressed air turbine to drive the rotor.

[0034] In a preferred embodiment of the rotary sprayer according to the present invention, the rotating magnet has a plurality of pairs of N and S magnetic poles, for example, two pairs, three pairs, or four pairs, arranged alternately on its circumference.

[0035] Regarding the detection range around the magnet as described above, it should also be noted that the detection range along the axis of rotation is preferably extended in the axial direction, and its range may be 5 mm to 5 cm. On the other hand, in the radial direction, the detection range is preferably extended in the radial direction, and its range may be 5 mm to 3 cm.

[0036] As already mentioned at the beginning, it is desirable for a rotary sprayer to detect not only the rotational speed but also the direction of rotation. Therefore, in the rotary sprayer of the present invention, in order to detect both the rotational speed and direction of rotation of the rotor, it is preferable that the distribution of magnetic poles on the circumference of the rotor is not rotationally symmetric. If the magnetic poles are arranged rotationally, the pulse train supplied from the magnetic sensor does not contain information about the rotational direction of the rotary sprayer. If the magnetic poles in the rotor are not arranged rotationally, the pulse train supplied from the magnetic sensor will also contain information about the rotational direction of the rotary sprayer, thus making it different.

[0037] Furthermore, it should be noted that, generally speaking, the rotary sprayer of the present invention is preferably designed for spraying paint when painting automobile body parts. However, with respect to the coating agent to be sprayed, the present invention is not limited to paint and can be implemented with other types of coating agents. Moreover, the rotary sprayer of the present invention is suitable not only for coating automobile body parts but also for coating other types of parts.

[0038] Finally, the present invention also includes a novel use of the rotary sprayer according to the present invention for spraying paint, particularly in the painting of automobile body parts. The paint can be, for example, a wet paint (liquid paint) or a powder paint. It should also be noted that the present invention is not limited to automobile body parts with respect to the parts to be painted, but is also suitable for painting other types of parts.

[0039] Other advantageous embodiments of the present invention are described below in more detail, either as characterized in the dependent claims or in conjunction with the description of preferred embodiments of the present invention with reference to the drawings. [Brief explanation of the drawing]

[0040] [Figure 1A] This shows a cross-sectional view of the rotary sprayer of the present invention. [Figure 1B] This is a detailed enlarged view of Figure 1A. [Figure 2] This shows a perspective view of the magnetic disk used for speed detection in the rotary sprayer of the present invention. [Figure 3] This shows a rear view in the axial direction of the rotary sprayer of the present invention. [Figure 4] Figure 2 shows a magnetic sleeve that replaces the magnetic disk shown. [Figure 5] This is a cross-sectional view of a modified rotary sprayer with a metal plate package for minimizing interference eddy currents. [Figure 6] Figure 5 shows a rear view of the rotary sprayer in the axial direction. [Figure 7] This is a schematic diagram of a modified magnetic disk in which the magnetic poles are arranged asymmetrically to enable the detection of the direction of rotation. [Figure 8] This section shows modified examples of the present invention with different arrangements of magnetic sensors. [Figure 9] This section shows modified examples of the present invention with different arrangements of magnetic sensors. [Figure 10] This section shows modified examples of the present invention with different arrangements of magnetic sensors. [Modes for carrying out the invention]

[0041] The following describes an embodiment of the rotary sprayer 1 according to the invention shown in the drawings. Figure 1A is a cross-sectional view showing a part of the rotary sprayer 1.

[0042] Therefore, the rotary sprayer 1 first includes a sprayer shaft 2 in the conventional manner. This shaft is part of the rotor and rotates around the rotation axis 3 during operation (see Figures 3, 5, and 6). The sprayer shaft 2 is driven conventionally by a compressed air turbine, which is not shown for simplification.

[0043] Since the sprayer shaft 2 is rotatably installed inside the sprayer housing 4 using a conventional method, the bearing for the sprayer shaft 2 is also not shown in the diagram.

[0044] The magnetic disk 5 is press-fitted onto the sprayer shaft 2, and, as shown in Figure 2 in particular, multiple N and S magnetic poles are arranged on its circumference.

[0045] The rotational speed is detected by a Wiegand sensor 6 located inside the sprayer housing 4. This Wiegand sensor 6 is separated from the magnetic disk 5 by an air gap 7. Within the air gap 7, the magnetic field B(→) generated by the magnetic disk 5 flows, in principle, axially, that is, parallel to the rotation axis 3 of the sprayer shaft 2. As the sprayer shaft 2 rotates together with the magnetic disk 5, the direction of the magnetic field B(→) within the air gap 7 changes continuously. That is, a change in pole occurs within the air gap 7, which is detected by the Wiegand sensor 6 as before.

[0046] It should also be noted that the Wiegand sensor 6 is positioned within a detection range 8 around the magnetic disk 5, and is therefore capable of detecting the pole changes occurring in the air gap 7 due to the rotating magnetic disk 5. The detection range 8 is shown only schematically to facilitate understanding of the present invention. In practice, the detection range 8 is not circular or spherical.

[0047] The air gap 7 has an axial gap width of b = 10 mm. This is advantageous because the electrical insulating effect of air prevents eddy currents and reverse magnetic fields from being induced within the air gap 7, thus significantly preventing interference with velocity measurements.

[0048] Furthermore, as shown in Figure 3, it should be noted that the Wiegand sensor 6 is positioned within a circumferentially extending elongated hole 9 in the sprayer housing 4. Since the Wiegand sensor 6 is positioned at the center of the elongated hole 9 with respect to the circumferential direction, it is surrounded on both sides by the elongated hole 9 in the circumferential direction. It should also be noted that the Wiegand sensor 6 does not completely fill the elongated hole 9, leaving a radial free space inside. The placement of the Wiegand sensor 6 within the elongated hole 9 has the advantage of preventing interference-induced currents and reverse magnetic fields from being induced inside the elongated hole 9, and also contributes to reducing sensitivity to interference in speed measurement. It should be noted that the elongated hole 9 can also be sealed with an electrical insulating material such as plastic. This has the advantage of avoiding air turbulence within the elongated hole 9 and preventing mechanical force losses.

[0049] Figure 4 shows a magnetic sleeve 11 that can be press-fitted onto, for example, a sprayer shaft, as an alternative to the magnetic disk 5 shown in Figure 2. Like the magnetic disk 5 in Figure 2, the magnetic sleeve 11 also has multiple N and S magnetic poles distributed circumferentially to cause a change in poles during rotation. However, the associated Wiegand sensor is preferably positioned radially outwards and separated from the magnetic sleeve 11 by an air gap. In this modified configuration using the magnetic sleeve 11, the magnetic field within the air gap between the magnetic sensor and the magnetic sleeve 11 flows primarily radially.

[0050] Figure 5 shows a modified example of the rotary sprayer 1 according to the present invention, which is substantially equivalent to the embodiment described above. Therefore, to avoid repetition, the above description is referenced, and the same reference numerals are used for corresponding details.

[0051] A special feature of this modified embodiment is that, as is particularly evident from Figure 6, a metal plate package 12 is arranged within the sprayer housing 4, and the metal plate package 12 comprises a number of metal plates 13 distributed circumferentially. Thus, each adjacent metal plate 13 is separated from one another by an air gap 14. Therefore, the metal plate package 12 prevents the flow of eddy currents circumferentially because adjacent metal plates 13 are insulated from each other. Thus, the metal plate package 12 also contributes to avoiding interference eddy currents that occur when the magnetic disk 5 rotates. The Wiegand sensor 6 is located in an axial hole 15 that penetrates the metal plate package 12. Figure 6 also shows that each individual metal plate 13 of the metal plate package 12 is arranged on a plane containing the rotation axis 3 of the rotary sprayer 1. Therefore, in the cross-sectional view of Figure 6, each individual metal plate 13 extends radially.

[0052] Furthermore, Figure 7 shows a modified example of the magnetic disk 5 according to Figure 2, and the same reference numerals are used for corresponding details; therefore, to avoid repetition, we will first refer to the above-described explanation of Figure 2.

[0053] A special feature of this embodiment is that the north and south magnetic poles are not rotationally symmetrically arranged on the circumference of the magnetic disk 5. This has the advantage of enabling not only speed measurement but also determination of the direction of rotation. Because the north and south magnetic poles are not rotationally symmetrically arranged, the pulse train supplied from the magnetic sensor contains not only information about the rotational speed but also information about the direction of rotation of the rotary sprayer.

[0054] The present invention is not limited to the preferred embodiments described above. Rather, the present invention also includes variations and modifications that utilize the concept of the invention and are therefore included within the scope of protection. In particular, the present invention claims protection for the subject matter and features of dependent claims independently of the claims referenced in each case, and especially for features of the main claims even without them. Thus, the present invention includes various aspects of the invention that are protected independently of each other. This applies in particular to the idea of ​​using a metal plate package in a rotary sprayer to minimize eddy currents. Therefore, the idea of ​​using a metal plate package in a rotary sprayer to avoid eddy currents without special arrangement of materials with poor or good electrical conductivity outside the detection range is also implementable within the scope of the present invention.

[0055] Finally, Figures 8-10 show various modifications of the present invention with different arrangements of the magnetic sensor 6. Since these modifications mainly correspond to the embodiments described above, refer to the above description to avoid repetition and use the same reference numerals for corresponding details.

[0056] In the embodiment shown in Figure 8, the magnetic sensor 6 is elongated, and its longitudinal axis is positioned parallel to the rotor's rotation axis 3, similar to the embodiment shown in Figure 1A. However, while in the embodiment shown in Figure 1A the magnetic sensor 6 is positioned close to the front of the magnetic disk 5 in the axial direction, in this embodiment the magnetic sensor 6 partially overlaps with the magnetic disk 5 in the axial direction and is positioned radially on the outside of the magnetic disk 5 around its circumference. Therefore, the air gap 7 is circular and separates the magnetic sensor 6 from the magnetic disk 5 in the radial direction.

[0057] In Figure 9, the magnetic sensor 6 also has an elongated shape. However, the magnetic sensor 6 is positioned radially with respect to the axis of rotation 3, with its longitudinal axis aligned with the axis of rotation 3. The magnetic sensor 6 is separated from the magnetic disk 5 radially by an annular air gap 7, and is arranged radially outward on the circumference of the magnetic disk 5.

[0058] Finally, Figure 10 also shows the magnetic sensor 6 positioned radially with respect to the rotor's rotation axis 3. However, the magnetic sensor 6 is positioned close to the front of the magnetic disk 5 in the axial direction and partially overlaps with the magnetic disk 5 in the radial direction. Therefore, the annular circumferential air gap 7 separates the magnetic sensor 6 and the magnetic disk 5 in the axial direction.

[0059] Some of the advantages of this invention are briefly summarized below. This invention enables the detection of the rotational speed and direction of a rotary sprayer without interference, thereby achieving reliable control and reducing downtime. Furthermore, this invention increases the signal margin, enabling more stable control. Furthermore, speed detection becomes less susceptible to external influences. Furthermore, the rotary sprayer according to the present invention is highly efficient, and eddy current losses and air turbulence losses are reduced, resulting in lower air consumption at all operating points. Finally, clearances (e.g., air gaps, elongated holes) allow for a lighter design of the rotary sprayer.

[0060] (Note) (Note 1) A rotary sprayer (1) for spraying a coating agent, in particular a rotary sprayer (1) for spraying paint for painting automobile body parts, a) Rotatably supported rotors (2, 5, 11) that rotate around a rotating shaft (3) at a specific rotational speed during operation, b) A magnet (5, 11) that rotates together with the rotor (2, 5, 11), having multiple magnetic poles (N pole, S pole) dispersed on the circumference, thereby changing its pole in the circumferential direction, c) A magnetic sensor (6) that is disposed at a fixed position within the rotary atomizer (1) and detects a change in the poles of the magnetic field (B(→)) of the rotating magnets (5, 11) that rotate together with the rotors (2, 5, 11). The magnetic sensor (6) is disposed within the detection range (8) around the magnets (5, 11), whereby it is possible to detect the rotating change in the poles of the magnetic field (B(→)). d) In order to avoid induced interference currents within the detection range (8), only materials with low electrical conductivity are disposed around the rotating magnets (5, 11) within the detection range (8). These materials have a high specific resistance of 1 Ωmm 2 / m or more, 0.5 Ωmm 2 / m or more, or 0.1 Ωmm 2 / m or more, and / or e) Materials with high electrical conductivity, these materials have a low specific resistance of less than 1 mm 2 / m, less than 0.5 Ωmm 2 / m, or less than 0.1 Ωmm 2 / m, and are disposed only outside the detection range (8) around the rotating magnets (5, 11). Characterized by Rotary atomizer

[0061] (Appendix 2) a) Materials with low electrical conductivity disposed inside the detection range (8) around the rotating magnets (5, 11), and b) Materials with high electrical conductivity disposed outside the detection range (8) around the rotating magnets (5, 11), Characterized by the combination of materials Rotary atomizer (1) according to Appendix 1

[0062] (Appendix 3) The materials with low electrical conductivity within the detection range (8) around the rotating magnets (5, 11) are plastic, stainless steel or titanium. Characterized by, rotary atomizer (1) according to Appendix 1 or 2

[0063] (Appendix 4) a) The fixed magnetic sensor (6) is spatially separated from the rotating magnet by an air gap, b) The air gap preferably has a gap width (b) of at least 0.1 mm, 0.5 mm, 1 mm, 2 mm, 5 mm, or 10 mm. A rotary sprayer (1) characterized by any one of the appendices 1 to 3.

[0064] (Note 5) a) The magnet (5) is formed as a magnetic disk (5), b) The magnetic sensor (6) is separated axially from the magnetic disk (5) by the air gap (7), c) The magnetic field (B(→)) flows in principle axially within the air gap (7), d) The magnetic sensor (6) is preferably positioned close to the magnetic disk (5) in the axial direction. e) The magnetic disk (5) is preferably arranged coaxially with the rotation axis (3), A rotary sprayer (1) as described in Appendix 4, characterized by the above.

[0065] (Note 6) a) The magnet (11) is formed as a hollow magnet sleeve (11), b) The magnetic sensor is radially separated from the magnet sleeve (11) by the air gap, c) The magnetic field within the air gap is, in principle, radial, d) The magnetic sensor is preferably positioned radially outward of the magnet sleeve (11), A rotary sprayer as described in Appendix 4, characterized by the features described herein.

[0066] (Note 7) a) The magnetic sensor (6) is at least partially located within an annular space (9) extending in the circumferential direction, b) The annular space (9) may optionally extend around the entire circumference of the rotation axis (3), c) The annular space (9) optionally has at least one elongated hole (9) that extends only to a portion of the circumference around the rotation axis (3), d) The magnetic sensor (6) is optionally positioned at the center of the elongated hole (9) in the circumferential direction, so that the magnetic sensor (6) is surrounded on both sides by the elongated hole (9) in the circumferential direction. e) The magnetic sensor (6) is optionally configured not to completely fill the annular space (9) in the radial direction, but to leave a radial free space (10) inside. A rotary sprayer (1) characterized by any one of the appendices 1 to 6.

[0067] (Note 8) a) The annular space (9) is at least partially filled with an electrically insulating material, b) The electrical insulating material in the annular space (9) is preferably plastic, c) The electrical insulating material in the annular space (9) is preferably 10 3 mm 2 / m or more, 10 4 Ωmm 2 / m or more, 10 5 Ωmm 2 / m or more, 10 6 Ωmm 2 / m or more, 10 7 Ωmm 2 / m or more, 10 8 Ωmm 2 / m or more, 10 9 Ωmm 2 / m or more, 10 10 Ωmm 2 Having a resistivity of / m or more, A rotary sprayer (1) characterized by any one of the appendices 1 to 7.

[0068] (Note 9) The metal plate package (12) comprises a number of metal sheets (13) for reducing eddy current losses caused by the rotating pole change of the magnetic field (B(→)) of the rotating magnets (5, 11), A rotary sprayer (1) characterized by any one of the appendices 1 to 8.

[0069] (Note 10) a) The magnetic sensor (6) is at least partially located within the metal plate package (12), and / or b) The magnetic sensor (6) is located in an axial hole (15) within the metal plate package (12). The rotary sprayer (1) described in Appendix 9, characterized by the above.

[0070] (Note 11) a) Each of the metal plates (13) of the metal plate package (12) is flat and arranged in a plane including the rotation axis (3), and / or b) Each of the metal plates (13) is distributed circumferentially with respect to the rotation axis (3), and / or c) The metal plate package (12) is arranged in an annular manner coaxially with respect to the rotation axis (3) of the rotor (2, 5, 11), and / or d) At least a portion of the metal plate (13) of the metal plate package (12) is slotted, and / or e) The metal plate (13) is made of mu-metal and / or f) The adjacent metal plates (13) of the metal plate package (12) are separated by an air gap (14), and / or g) The metal plate package (12) is preferably located within the detection range (8) around the magnets (5, 11). A rotary sprayer (1) as described in Appendix 9 or 10, characterized by the above.

[0071] (Note 12) a) The magnetic field (B(→)) generated by the rotating magnets (5, 11) has a first maximum magnetic field strength at the position of the magnetic sensor (6) as a useful signal. b) The inverse magnetic field, as an interference signal generated by the induced current, has a second maximum magnetic field strength at the position of the magnetic sensor (6). c) The second maximum magnetic field strength of the interference signal is 30%, 20%, 10%, 5%, or 2% of the first maximum magnetic field strength of the useful signal at the position of the magnetic sensor (6). A rotary sprayer (1) characterized by any one of the appendices 1 to 11.

[0072] (Note 13) The magnetic sensor (6) is elongated, and its longitudinal axis is arranged parallel to the rotation axis (3) of the rotor. A rotary sprayer (1) characterized by any one of the appendices 1 to 12.

[0073] (Note 14) a) The magnetic sensor (6) is positioned in close proximity to the front of the magnetic disk (5) in the axial direction, and is separated from the magnetic disk (5) by the air gap (7) in the axial direction, and / or b) The magnetic field (B(→)) within the air gap (7) flows in the axial direction in principle, and / or c) The magnetic sensor (6) is positioned at least partially within the maximum diameter of the magnetic disk (5), A rotary sprayer (1) as described in Appendix 13, characterized by the above.

[0074] (Note 15) a) The magnetic sensor (6) overlaps with the magnetic disk (5) at least partially in the axial direction, and / or b) The magnetic sensor (6) is located radially outside the magnetic disk (5) and is separated from the magnetic disk (5) by the air gap (7) which extends radially in an annular manner from the magnetic disk (5), and / or c) The magnetic field (B(→)) within the air gap (7) is, in principle, radial, and / or d) The magnetic disk (6) is magnetized on its circumference, A rotary sprayer (1) as described in Appendix 13, characterized by the above.

[0075] (Note 16) The magnetic sensor (6) is formed to be elongated, and its longitudinal axis is positioned radially with respect to the rotation axis (3) of the rotor. A rotary sprayer (1) characterized by any one of the appendices 1 to 12.

[0076] (Note 17) a) The magnetic sensor (6) is positioned on the circumference of the magnetic disk (5), radially outward from the magnetic disk (5), and axially overlapping with the magnetic disk (5), and is separated from the magnetic disk (5) by the radially annular air gap (7), and / or b) The magnetic field (B(→)) within the air gap (7) is, in principle, radial, and / or c) The magnetic disk (6) is magnetized on its circumference, The rotary sprayer (1) described in Appendix 16, characterized by the above.

[0077] (Note 18) a) The magnetic sensor (6) is positioned in close proximity to the front of the magnetic disk (5) in the axial direction, and is separated from the magnetic disk (5) by the air gap (7) in the axial direction, and / or b) The magnetic field (B(→)) within the air gap (7) is, in principle, axial. The rotary sprayer (1) described in Appendix 16, characterized by the above.

[0078] (Note 19) a) The magnetic sensor (6) is a Wiegand sensor (6) and / or b) The rotor (2, 5, 11) includes the magnetic sensor (6) as a separate component connected to the rotor (2, 5, 11) in a rotationally fixed state, and / or c) The rotor (2, 5, 11) comprises a sprayer shaft (2) having an option for attaching a bell cup at its distal end, which in particular is configured as a thread for screwing the bell cup onto the sprayer shaft, and / or d) The rotating atomizer (1) comprises a compressed air turbine for driving the rotors (2, 5, 11), and / or e) The rotating magnet (5, 11) has multiple pairs of N magnetic poles (N) and S magnetic poles (S) alternately on its circumference, and in particular has more than two, three, or four pairs, and / or f) The detection range (8) around the magnets (5, 11) has an axial extension of a maximum of 5 cm, 3 cm, 2 cm, 1 cm and / or a minimum of 1 mm, 2 mm, 3 mm, 4 mm or 5 mm along the rotation axis (3), and / or g) The detection range (8) around the magnets (5, 11) has a radial extension of a maximum of 3 cm, 2 cm, 1 cm, and 5 mm in the radial direction with respect to the rotation axis (3), and / or a minimum of 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, and / or h) In order to enable detection of both the rotational speed and direction of the rotor (2, 5, 11), the distribution of the magnetic poles (N pole, S pole) on the circumference of the rotor (2, 5, 11) is not rotationally symmetric, and / or i) The magnetic sensor (6) can detect rotational speed only within the detection range (8), and cannot detect outside the detection range (8). A rotary sprayer (1) as described in any one of the appendices 1 to 18, characterized by the above.

[0079] (Note 20) In particular, the use of a rotary sprayer (1) described in any one of the appendices 1 to 19 for spraying liquid or powder paint in the painting of automobile body parts. [Explanation of Symbols]

[0080] 1 Rotary sprayer 2 Sprayer shaft 3. Rotor axis 4. Sprayer housing 5 Magnetic disks 6 Wiegand Sensor 7. Air gap between magnetic disk and Wiegand sensor 8. Detection range 9. Elongated holes for mounting Wiegand sensor 10. Inner radius clearance of the Wiegand sensor 11 Magnetic sleeve 12 Metal plate package 13 Metal plate 14. Air gap between adjacent plates in a metal plate package. 15 Axial holes in the metal plate package for housing the Wiegand sensor b. Width of the air gap between the magnetic disk and the Wiegand sensor NN magnetic pole SS magnetic pole B(→) Magnetic field in the air gap

Claims

1. A rotary sprayer (1) for spraying a coating agent, in particular a rotary sprayer (1) for spraying paint for painting automobile body parts, a) Rotatably mounted rotors (2, 5, 11) that rotate around the rotating shaft (3) at a specific rotational speed during operation, b) A magnet (5, 11) that rotates together with the rotor (2, 5, 11), having a plurality of magnetic poles (N pole, S pole) distributed on the circumference, thereby changing the pole in the circumferential direction, c) A magnetic sensor (6) is fixedly positioned within the rotary sprayer (1) and detects a change in the pole of the magnetic field (B(→)) of the magnets (5, 11) that rotate together with the rotor (2, 5, 11), wherein the magnetic sensor (6) is positioned within a detection range (8) around the magnets (5, 11) and is thereby capable of detecting the rotating change in the pole of the magnetic field (B(→)), d) In order to avoid interference-induced currents within the detection range (8), only electrically low conductive materials are placed around the rotating magnets (5, 11) within the detection range (8), and these materials have a conductivity of 1 Ω mm. ２ / m or more, 0.5Ωmm ２ / m or more, or 0.1Ωmm ２ High resistivity of / m or more, and / or e) Materials with high electrical conductivity, these materials have a resistivity of 1 mm². ２ Less than / m, 0.5Ωmm ２ Less than / m, or 0.1Ωmm ２ The resistivity is low, less than / m, and is positioned only outside the detection range (8) around the rotating magnets (5, 11), Characterized by, Rotary sprayer.

2. a) A material with low electrical conductivity placed inside the detection range (8) around the rotating magnets (5, 11), b) A highly electrically conductive material placed outside the detection range (8) surrounding the rotating magnets (5, 11), Characterized by the combination of materials, The rotary sprayer (1) according to claim 1.

3. The electrically less conductive material within the detection range (8) around the rotating magnets (5, 11) is plastic, stainless steel, or titanium. A rotary sprayer (1) according to claim 1 or 2, characterized in that...

4. a) The fixed magnetic sensor (6) is spatially separated from the rotating magnet by an air gap, b) The air gap preferably has a gap width (b) of at least 0.1 mm, 0.5 mm, 1 mm, 2 mm, 5 mm, or 10 mm. A rotary sprayer (1) according to any one of claims 1 to 3, characterized in that

5. a) The magnet (5) is formed as a magnetic disk (5), b) The magnetic sensor (6) is separated axially from the magnetic disk (5) by the air gap (7), c) The magnetic field (B(→)) flows in principle axially within the air gap (7), d) The magnetic sensor (6) is preferably positioned close to the magnetic disk (5) in the axial direction. e) The magnetic disk (5) is preferably arranged coaxially with the rotating shaft (3), The rotary sprayer (1) according to claim 4, characterized in that

6. a) The magnet (11) is formed as a hollow magnet sleeve (11), b) The magnetic sensor is radially separated from the magnet sleeve (11) by the air gap, c) The magnetic field within the air gap is, in principle, radial, d) The magnetic sensor is preferably positioned radially outward of the magnet sleeve (11). The rotary sprayer according to claim 4, characterized in that...

7. a) The magnetic sensor (6) is at least partially located within an annular space (9) that extends in the circumferential direction, b) The annular space (9) may optionally extend around the entire circumference of the rotation axis (3), c) The annular space (9) optionally has at least one elongated hole (9) that extends only to a portion of the circumference around the rotation axis (3), d) The magnetic sensor (6) is optionally positioned at the center of the elongated hole (9) in the circumferential direction, so that the magnetic sensor (6) is surrounded on both sides by the elongated hole (9) in the circumferential direction. e) The magnetic sensor (6) is optionally configured not to completely fill the annular space (9) in the radial direction, but to leave a radial free space (10) inside. A rotary sprayer (1) according to any one of claims 1 to 6, characterized in that

8. a) The annular space (9) is at least partially sealed with an electrically insulating material, b) The electrical insulating material in the annular space (9) is preferably plastic, c) The electrical insulating material in the annular space (9) preferably has a resistivity of 10 ３ mm ２ / m or more, 10 ４ Ω·mm ２ / m or more, 10 ５ Ω·mm ２ / m or more, 10 ６ Ω·mm ２ / m or more, 10 ７ Ω·mm ２ / m or more, 10 ８ Ω·mm ２ / m or more, 10 ９ Ω·mm ２ / m or more, 10 １０ Ω·mm ２ / m or more. A rotary sprayer (1) according to any one of claims 1 to 7, characterized in that

9. The metal plate package (12) comprises a number of metal sheets (13) for reducing eddy current losses caused by the rotating pole change of the magnetic field (B(→)) of the rotating magnets (5, 11), A rotary sprayer (1) according to any one of claims 1 to 8, characterized in that

10. a) The magnetic sensor (6) is at least partially located within the metal plate package (12), and / or b) The magnetic sensor (6) is positioned in an axial hole (15) within the metal plate package (12). The rotary sprayer (1) according to claim 9, characterized in that

11. a) Each of the metal plates (13) of the metal plate package (12) is flat and arranged in a plane including the rotation axis (3), and / or b) The individual metal plates (13) are distributed circumferentially with respect to the rotation axis (3), and / or c) The metal plate package (12) is arranged in an annular manner coaxially with respect to the rotation axis (3) of the rotor (2, 5, 11), and / or d) At least a portion of the metal plate (13) of the metal plate package (12) is slotted, and / or e) The metal plate (13) is made of mu-metal and / or f) The adjacent metal plates (13) of the metal plate package (12) are separated by an air gap (14), and / or g) The metal plate package (12) is preferably positioned within the detection range (8) around the magnets (5, 11), A rotary sprayer (1) according to claim 9 or 10, characterized in that...

12. a) The magnetic field (B(→)) generated by the rotating magnets (5, 11) has a first maximum magnetic field strength at the position of the magnetic sensor (6) as a useful signal. b) The inverse magnetic field, as an interference signal generated by the induced current, has a second maximum magnetic field strength at the position of the magnetic sensor (6). c) The second maximum magnetic field strength of the interference signal is a maximum of 30%, 20%, 10%, 5%, or 2% of the first maximum magnetic field strength of the useful signal at the position of the magnetic sensor (6). A rotary sprayer (1) according to any one of claims 1 to 11, characterized in that

13. The magnetic sensor (6) is elongated, and its longitudinal axis is arranged parallel to the rotation axis (3) of the rotor. A rotary sprayer (1) according to any one of claims 1 to 12, characterized in that

14. a) The magnetic sensor (6) is positioned in close proximity to the front of the magnetic disk (5) in the axial direction, and is separated from the magnetic disk (5) by the air gap (7) in the axial direction, and / or b) The magnetic field (B(→)) within the air gap (7) flows primarily in the axial direction, and / or c) The magnetic sensor (6) is positioned at least partially within the maximum diameter of the magnetic disk (5), The rotary sprayer (1) according to claim 13, characterized in that...

15. a) The magnetic sensor (6) overlaps with the magnetic disk (5) at least partially in the axial direction, and / or b) The magnetic sensor (6) is located radially outside the magnetic disk (5) and is separated from the magnetic disk (5) by the air gap (7) which extends radially in an annular manner from the magnetic disk (5), and / or c) The magnetic field (B(→)) within the air gap (7) is, in principle, radial, and / or d) The magnetic disk (6) is magnetized on its circumference, The rotary sprayer (1) according to claim 13, characterized in that...

16. The magnetic sensor (6) is formed to be elongated, and its longitudinal axis is positioned radially with respect to the rotation axis (3) of the rotor. A rotary sprayer (1) according to any one of claims 1 to 12, characterized in that

17. a) The magnetic sensor (6) is positioned on the circumference of the magnetic disk (5), radially outward from the magnetic disk (5), and axially overlapping with the magnetic disk (5), and is separated from the magnetic disk (5) by the radially annular air gap (7), and / or b) The magnetic field (B(→)) within the air gap (7) is, in principle, radial, and / or c) The magnetic disk (6) is magnetized on its circumference, The rotary sprayer (1) according to claim 16, characterized in that...

18. a) The magnetic sensor (6) is positioned in close proximity to the front of the magnetic disk (5) in the axial direction, and is separated from the magnetic disk (5) by the air gap (7) in the axial direction, and / or b) The magnetic field (B(→)) within the air gap (7) is, in principle, axial. The rotary sprayer (1) according to claim 16, characterized in that...

19. a) The magnetic sensor (6) is a Wiegand sensor (6) and / or b) The rotor (2, 5, 11) includes the magnetic sensor (6) as a separate component connected to the rotor (2, 5, 11) in a rotationally fixed state, and / or c) The rotor (2, 5, 11) comprises a sprayer shaft (2) having an option for attaching a bell cup at its distal end, which in particular is configured as a thread for screwing the bell cup onto the sprayer shaft, and / or d) The rotary atomizer (1) comprises a compressed air turbine for driving the rotors (2, 5, 11), and / or e) The rotating magnet (5, 11) has multiple pairs of N magnetic poles (N) and S magnetic poles (S) alternately on its circumference, and in particular has more than two, three, or four pairs, and / or f) The detection range (8) around the magnets (5, 11) has an axial extension of a maximum of 5 cm, 3 cm, 2 cm, 1 cm and / or a minimum of 1 mm, 2 mm, 3 mm, 4 mm or 5 mm along the rotation axis (3), and / or g) The detection range (8) around the magnets (5, 11) has a radial extension of a maximum of 3 cm, 2 cm, 1 cm, and 5 mm with respect to the rotation axis (3), and / or a minimum of 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, and / or h) In order to enable detection of both the rotational speed and rotational direction of the rotor (2, 5, 11), the distribution of the magnetic poles (N pole, S pole) on the circumference of the rotor (2, 5, 11) is not rotationally symmetric, and / or i) The magnetic sensor (6) can detect rotational speed only within the detection range (8), and cannot detect outside the detection range (8). A rotary sprayer (1) according to any one of claims 1 to 18.

20. In particular, the use of a rotary sprayer (1) according to any one of claims 1 to 19 for spraying liquid or powder paint in the painting of automobile body parts.

Images