JP2018058016A - Rotary atomization coating equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary atomizing coating apparatus capable of accurately detecting the rotational speed of a rotary atomizing head.
A rotary atomizing coating apparatus 1 includes: a rotary atomizing head 20 that atomizes and discharges paint by rotation; and a detected portion 25 that has magnetism and rotates integrally with the rotary atomizing head 20. And the rotational speed of the rotary atomizing head 20 is detected when the magnetic sensor 30 detects a magnetic field change caused by the detected portion 25 when the rotary atomizing head 20 rotates.
[Selection] Figure 1

Description

  The present invention relates to a rotary atomizing coating apparatus.

  2. Description of the Related Art Conventionally, a rotary atomizing coating machine (hereinafter, also simply referred to as “coating machine”) having a rotary atomizing head that rotates at high speed has been used in a coating process for automobile parts. This coating machine is configured to granulate paint by rotation of a rotary atomizing head and apply it to a surface to be coated of a part using air and static electricity. In this configuration, it is necessary to control the rotational speed of the rotary atomizing head in order to adjust the degree of paint granulation. For this reason, this type of coating machine detects the rotational speed of the rotary atomizing head. It has a detection structure.

  For example, the automatic coating apparatus disclosed in Patent Document 1 includes a detection structure that detects the rotational speed of a rotary atomizing head using an optical fiber cable. Specifically, an optical fiber cable plug is disposed in the vicinity of an air turbine that rotates integrally with the rotary atomizing head, and the rotational speed of the air turbine is detected via the optical fiber cable.

JP 2001-79463 A

  However, it is known that the detection performance of this automatic coating device is deteriorated due to the influence of contamination of the optical fiber cable, contamination by the solvent, bending, etc. There is a problem that the reliability of number detection is low.

  This invention is made | formed in view of this subject, and it aims at providing the rotary atomization coating apparatus which can detect the rotation speed of a rotary atomization head accurately.

One embodiment of the present invention provides:
A rotary atomizing head that atomizes and discharges paint by rotation;
A detected portion having magnetism and rotating integrally with the rotary atomizing head;
With
The rotary atomizing coating apparatus is configured to detect the number of rotations of the rotary atomizing head by detecting a magnetic field change caused by the detected portion when the rotary atomizing head rotates. .

  In the above rotary atomizing coating apparatus, the rotational speed of the rotary atomizing head is detected by a magnetic sensor. Thus, by using the magnetic sensor to detect the rotational speed of the rotary atomizing head, for example, the problem of deterioration in detection performance when using an optical fiber cable does not occur.

  As mentioned above, according to said aspect, the rotation atomization coating apparatus which can detect the rotation speed of a rotation atomization head accurately can be provided.

FIG. 2 is a plan view schematically showing the coating apparatus according to the first embodiment. The side view of the coating apparatus shown by FIG. The figure which shows the cross-section of the coating machine in FIG. The figure which looked at the bell hub in FIG. 3 from the front. It is a flowchart of the rotation speed detection process of a bell. The figure which shows the cross-section of the coating machine of the coating device of Embodiment 2. FIG. The figure which looked at the bell hub in FIG. 6 from the front. The figure which shows the cross-section of the coating machine of the coating device of Embodiment 3. FIG. IX-IX arrow directional cross-sectional view of FIG.

In the above-described rotary atomizing coating apparatus, the rotary atomizing head is provided at a bell cup having a cup shape and a bell hub which is provided at a central portion in the radial direction of the bell cup and forms a paint circulation hole. It is preferable that the detected portion is provided on the bell hub.
Thus, by providing the detected portion on the rotary atomizing head itself, which is the detection target of the rotational speed, the rotational speed of the rotary atomizing head can be detected more accurately by the magnetic sensor. In particular, the detection part is provided on the bell hub by using a bell hub that does not obstruct the coating function of atomizing and discharging the paint as compared with the bell cup of the rotary atomizing head. It is hard to get in the way of function.

In the rotary atomizing coating apparatus, the detected portion is preferably embedded in the bell hub.
Thereby, it is not necessary to change the shape of the bell hub for the detected portion, and the outer diameter of the bell hub can be prevented from increasing. As a result, it is possible to prevent the coating apparatus from becoming large.

Preferably, the rotary atomizing coating apparatus includes a drive unit having an output shaft for rotationally driving the rotary atomizing head, and the detected portion is provided on the output shaft of the drive unit.
Thus, by providing the detected portion on the output shaft of the drive unit which is a separate member from the rotary atomizing head, the coating function that the rotary atomizing head atomizes and discharges the paint is not easily inhibited by the detected portion.

The rotary atomizing coating apparatus includes a holding arm that holds a housing that accommodates the rotary atomizing head and the detected portion, and the magnetic sensor is provided on one of the holding arm and the outer surface of the housing. It is preferably attached.
Thereby, the magnetic sensor can be arranged outside the coating machine, and the internal space is increased by reducing the proportion of the contents accommodated in the housing as compared with the case where the magnetic sensor is arranged in the housing of the painting machine. be able to. In addition, the magnetic sensor can be easily replaced.

  Hereinafter, an embodiment of a rotary atomizing coating apparatus (hereinafter simply referred to as “coating apparatus”) will be described with reference to the drawings.

  In the drawing for explaining the coating apparatus, the axial direction of the rotary atomizing head is indicated by an arrow X, the width direction of the coating apparatus is indicated by an arrow Y, and the height direction of the coating apparatus is indicated by an arrow Z. .

(Embodiment 1)
As shown in FIGS. 1 and 2, the coating apparatus 1 according to the first embodiment includes two coating machines 10 </ b> A and 10 </ b> B, one magnetic sensor 30, an actuator 40, and a control device 50.

  The control device 50 includes a known CPU, memory, input / output unit, and the like. The control device 50 includes a coating machine control unit 51 for controlling the two coating machines 10A and 10B, and an actuator control unit 52 for controlling the actuator 40.

  In the two coating machines 10 </ b> A and 10 </ b> B, the respective housings 11 are integrally held by one holding arm 2. In FIG.1 and FIG.2, two coating machine 10A, 10B is being fixed to the horizontal extension part 2a of the holding arm 2. As shown in FIG. Further, the holding arm 2 is connected to a robot arm (not shown). For this reason, the holding arm 2 is driven by controlling the robot arm when the coating apparatus 1 is used, and the positions and postures of the two coating machines 10A and 10B are changed.

  The two coating machines 10A and 10B are for coating the surface 61 of the workpiece 60 to be coated. In the following description, one of the two coating machines 10A and 10B is also referred to as a first coating machine 10A, and the other is also referred to as a second coating machine 10B.

  The magnetic sensor 30 is attached to the holding arm 2. Thereby, the magnetic sensor 30 can be arrange | positioned outside coating machine 10A, 10B.

  The magnetic sensor 30 has a function of detecting the rotational speeds of the rotary atomizing heads (rotating atomizing heads 20 in FIG. 3) of the two coating machines 10A and 10B. In order to realize this function, the magnetic sensor 30 is configured as an MI sensor (Magneto-Impedance Sensor) having a magnetic impedance element (MI element). This magnetic sensor 30 is also used for the two coating machines 10A and 10B.

  The magnetic sensor 30 is a known sensor, and a detailed description of its structure and principle is omitted here. However, in general, impedance (AC voltage and AC current) of a high-permeability alloy magnetic material such as an amorphous alloy wire is omitted. Ratio) changes sensitively by an external magnetic field, so-called “magnetic impedance effect”.

  Here, the magnetic sensor 30 is a sensor that utilizes the effect that the impedance of the element changes due to an external magnetic field change. The magnetic sensor 30 has directivity with respect to sensitivity to an external magnetic field change, and a direction in which the detection sensitivity of the magnetic field change is high is determined. For example, in a coating machine in which the detection direction D1 (see FIGS. 1 and 2) of the magnetic sensor 30 is directed, the rotational speed of the rotary atomizing head can be accurately detected without contact by the magnetic sensor 30.

  For details of the magnetic sensor 30, for example, a magnetic sensor 150 disclosed in Japanese Patent Laid-Open No. 2002-195854 is referred to.

  The magnetic sensor 30 is fixed with respect to the rotation shaft 41 of the actuator 40. For this reason, the actuator 40 is configured to be able to change the orientation of the magnetic sensor 30 with respect to the two coating machines 10A and 10B by rotating the rotary shaft 41. At this time, the magnetic sensor 30 can turn horizontally around the rotation shaft 41. The actuator 40 is configured as an air-driven motor, and is configured to operate based on a control signal from the actuator control unit 52 of the control device 50.

  The actuator controller 52 makes the first coating machine 10A the target coating machine for the magnetic sensor 30 (hereinafter also referred to as “target coating machine 10T”) so that the magnetic sensor 30 is directed to the first coating machine 10A. The actuator 40 is controlled. That is, the actuator control unit 52 makes the direction of the magnetic sensor 30 in the direction in which the detection sensitivity of the magnetic field change is high with respect to the detected portion 25 of the first coating machine 10A (the detection direction D1 is the same as that of the magnetic sensor 30. Actuator 40 is controlled so as to overlap a virtual straight line D2 passing through coating machine 10A.

  For this purpose, the actuator control unit 52 stores in advance the relationship between the orientation of the magnetic sensor 30 relative to the detected portion 25 of the first coating machine 10A and the rotation angle of the magnetic sensor 30, and based on this relationship. It is preferable to control the rotation angle of the magnetic sensor 30. Thereby, the magnetic sensor 30 is set to the first position P1 (position indicated by the solid line in FIG. 1), and the first coating machine 10A becomes the target coating machine 10T.

  On the other hand, the actuator control unit 52 controls the actuator 40 so that the magnetic sensor 30 is directed to the second coating machine 10B in order to set the second coating machine 10B as the target coating machine T for the magnetic sensor 30. That is, the actuator control unit 52 makes the direction of the magnetic sensor 30 in the direction in which the detection sensitivity of the magnetic field change is high with respect to the detected part 25 of the second coating machine 10B (the detection direction D1 is the second direction with the magnetic sensor 30). Actuator 40 is controlled so as to overlap a virtual straight line D3 passing through coating machine 10B.

  For this purpose, the actuator control unit 52 stores in advance the relationship between the orientation of the magnetic sensor 30 relative to the detected portion 25 of the second coating machine 10B and the rotation angle of the magnetic sensor 30, and based on this relationship. It is preferable to control the rotation angle of the magnetic sensor 30. Thereby, the magnetic sensor 30 is set to the second position P2 (position indicated by a two-dot chain line in FIG. 1), and the second coating machine 10B becomes the target coating machine 10T instead of the first coating machine 10A.

  The actuator control unit 52 is configured to control the actuator 40 so as to switch the orientation of the magnetic sensor 30 with respect to each of the first coating machine 10A and the second coating machine 10B at a preset cycle. According to this configuration, the state of rotation of the bell 20 can be continuously monitored with good balance for the two coating machines 10A and 10B.

Next, the detailed structure of the first coating machine 10A will be described.
In addition, since the 2nd coating machine 10B is the same structure as 10A of 1st coating machines, description about the 2nd coating machine 10B is abbreviate | omitted below.

  As shown in FIG. 3, the first coating machine 10 </ b> A includes a housing 11, an air motor 14, a rotary atomizing head (hereinafter referred to as “bell”) 20, and a detected portion 25.

  The housing 11 houses the air motor 14, the bell 20, and the detected part 25. The housing 11 includes an air flow path 12 connected to an air supply source (not shown) at a portion close to the outer surface 11a. A part of the air flowing in from the inlet 12a of the air flow path 12 is used in the air motor 14 for the thrust direction air bearing and the radial direction air bearing. A part of the air is used for driving air for driving the air motor 14. Furthermore, the remainder of this air is used for shaping air injected from the opening 12b.

  The air motor 14 is built in the housing 11. The air motor 14 is a drive unit having an output shaft 16 for rotationally driving the bell 20, and a turbine 15 is fixed to the output shaft 16. On the outer peripheral surface of the turbine 15, a plurality of blades 15 a that are spaced apart from each other in the circumferential direction are provided.

  The turbine 15 is configured to rotate the output shaft 16 by supplying air to the plurality of blades 15a. The output shaft 16 is fixed to the bell cup 21 of the bell 20. For this reason, the bell 20 is configured to rotate integrally with the air motor 14 around the output shaft 16 as a rotation center.

  For details of the turbine 15 constituting the air motor 14, for example, the turbine 5 disclosed in Japanese Utility Model Laid-Open No. 60-151555 is referred to. Therefore, in this specification, the further detailed description of the turbine 15 is abbreviate | omitted by using this gazette.

  A paint tube 17 is built in the output shaft 16 of the air motor 14. The paint tube 17 is preferably formed of a transparent resin tube so that the degree of paint adhesion can be easily confirmed. The paint pipe 17 includes a flow path 17a through which paint supplied from a paint supply source (not shown) flows, and a discharge port 17b that communicates with the flow path 17a and is disposed in the internal space 23 of the bell 20. Yes. For this reason, the paint is discharged from the discharge port 17 b of the paint pipe 17 into the internal space 23.

  The bell 20 has a function of atomizing and discharging the paint by rotation. The bell 20 includes a cup-shaped bell cup 21 and a disk-shaped bell hub 22 provided at a central portion in the radial direction of the bell cup 21. The bell hub 22 is fastened and fixed to the bell cup 21 by a screw member (not shown). In the bell 20, an internal space 23 is partitioned by a bell cup 21 and a bell hub 22. A paint circulation hole 24 is formed between the bell cup 21 and the outer periphery of the bell hub 22.

  The surface 22 a of the bell hub 22 is configured as a facing surface that faces the surface 61 to be coated of the workpiece 60. The back surface 22 b of the bell hub 22 is configured as a curved surface capable of guiding the paint discharged into the internal space 23 to the paint circulation hole 24 radially outward of the bell hub 22.

  The bell 20 is connected to an external power source through the cable 13. For this reason, the bell 20 is energized by the electric power supplied through the cable 13 during the operation of the first coating machine 10A.

  The paint discharged into the internal space 23 of the bell 20 is atomized in a charged state in the internal space 23 by contacting the back surface 22b of the bell hub 22 in an energized state. Thereafter, the charged paint flows out through the paint circulation hole 24 between the bell cup 21 and the bell hub 22 and is applied to the work 60 in a certain pattern by the shaping air sprayed from the opening 12b of the housing 11. The surface 61 is sprayed.

  At this time, there is a correlation between the rotation speed of the bell 20 and the degree of granulation of the paint. That is, when the rotation speed of the bell 20 increases, the degree of granulation of the paint becomes relatively high, and the degree of granulation of the paint that decreases the rotation speed of the bell 20 becomes relatively low.

  The detected portion 25 is provided on a bell hub 22 that rotates integrally with the bell 20 when the air motor 14 is driven. The bell hub 22 is made of a metal material (aluminum, magnesium, etc.). On the other hand, the detected portion 25 is configured by a permanent magnet (magnetic material) that is magnetic. The detected portion 25 rotates integrally with the bell 20.

  The bell hub 22 may be made of a plastic material instead of a metal material. Further, instead of providing the detected portion 25 which is a magnetic material on the bell hub 22, the bell hub 22 itself is made of a magnetic plastic magnet material (ferrite, neodymium, samakoba, samarium iron nitrogen, etc.) It is also possible to adopt a configuration in which the bell hub 22 is fastened and fixed to the bell cup 21 by a screw member made of a material having Plastic magnet materials have the advantage that high dimensional accuracy and complex shapes are possible.

  As shown in FIGS. 3 and 4, the detected portion 25 is composed of a cylindrical N pole 25 a and S pole 25 b. Both the N pole 25 a and the S pole 25 b of the detected part 25 are embedded in the bell hub 22. The S pole 25b is disposed at a position moved 180 ° in the circumferential direction of the bell hub 22 from the N pole 25a. That is, the N pole 25 a and the S pole 25 b are in point symmetry with respect to the output shaft 16.

  In the detected portion 25, magnetic lines of force are formed from the N pole 25a to the S pole 25b. The direction of the lines of magnetic force becomes the direction of the magnetic field by the detected portion 25. When the bell 20 is rotated by receiving the driving force of the air motor 14, a magnetic field change is generated by the detected portion 25 that rotates integrally with the bell 20. At this time, the magnetic sensor 30 is configured to detect the rotation speed of the bell 20 by detecting a magnetic field change caused by the detected portion 25 when the bell 20 rotates.

Here, the control of the first coating machine 10A by the coating machine control unit 51 of the control device 50 will be described with reference to FIG. This control is executed according to the processing from steps S101 to S104 in FIG.
In addition, another step may be added to these steps as needed.

  Step S101 is a step of performing rotation speed feedback control of the first coating machine 10A. This step S101 can be executed when the magnetic sensor 30 is directed to the first coating machine 10A. Thereby, the magnetic sensor 30 can detect the actual rotational speed of the bell 20 in the first coating machine 10A. At this time, the detection frequency is obtained from the output voltage of the magnetic sensor 30, and the actual rotational speed of the bell 20 is calculated from the detection frequency.

  In step S101, the coating machine control unit 51 controls the first coating machine 10A based on the actual rotational speed of the bell 20 detected by the magnetic sensor 30 so that the rotational speed becomes the target rotational speed. . Specifically, the coating machine control unit 51 feedback-controls the amount of air supplied to the turbine 15 of the air motor 14 so that the rotation speed of the bell 20 matches the target rotation speed. Thereby, the rotation speed of the bell 20 is controlled to the target rotation speed.

  The target rotational speed at this time may be a fixed value set in advance, or may be a variable value that is appropriately changed according to the operating state of the coating apparatus 1 or the operating program. In this case, the coating machine control unit 51 stores in advance a relationship between the degree of paint granulation and the rotational speed of the rotary atomizing head, and based on this relation, the target rotational speed commensurate with the degree of paint granulation. By selecting, it becomes possible to adjust the degree of granulation of the paint to a desired level.

  Step S102 is a step for detecting the rotation speed of the bell 20 in the first coating machine 10A by the magnetic sensor 30 after the end of Step S101. According to this step S101, the actual rotational speed of the bell 20 is detected.

  Step S103 is a step of determining whether or not the detected rotational speed is out of the threshold range by comparing the detected rotational speed detected in step S102 with the threshold range. In this step S103, for example, when the detected rotational speed exceeds the upper limit value of the threshold range and falls below the lower limit value of the threshold range, it is determined that the detected rotational speed is out of the threshold range.

  If it is determined in step S103 that the detected rotational speed is out of the threshold range (in the case of “Yes” in step 103), the process proceeds to step S104. If not (in the case of “No” in step 103), step S103 is performed. Return to.

  Step S104 is a step for performing rotation speed suppression control when it is determined in step S103 that the detected rotation speed is out of the threshold range. In step S104, the coating machine control unit 51 performs control to reduce the amount of air supplied to the turbine 15 of the air motor 14 to a set value. The set value at this time may be zero or a value exceeding zero. The bell 20 stops rotating when the set value is zero, and the bell 20 rotates at a low speed when the set value is other than zero.

  As described above, the coating machine control unit 51 is configured to perform control to reduce the rotation speed of the bell 20 on the condition that the rotation speed of the bell 20 in the first coating machine 10A is out of the threshold range. . Thus, when the first coating machine 10A is the target coating machine 10T, it is determined whether or not the rotation abnormality of the bell 20 has occurred in the target coating machine 10T, and the load on the target coating machine 10T is determined based on the determination result. It can be lowered quickly.

  Next, the function and effect of the first embodiment will be described.

  According to the coating apparatus 1 described above, by using the magnetic sensor 30 to detect the rotation speed of the bell 20 in each coating machine, for example, there is no problem of deterioration in detection performance when using an optical fiber cable. . Therefore, it is possible to provide the coating apparatus 1 that can accurately detect the rotation speed of the bell 20 of each coating machine.

  According to the coating apparatus 1 described above, the rotation speed of the bell 20 can be detected with higher accuracy by the magnetic sensor 30 by providing the detected portion 25 on the bell 20 itself that is the rotation speed detection target. In particular, by using a bell hub 22 that does not hinder the painting function of atomizing and discharging paint compared to the bell cup 21 of the bell 20, the detected portion 25 is provided on the bell hub 22. Less likely to interfere with the above painting function.

  Further, by embedding the N pole 25a and the S pole 25b of the detected portion 25 in the bell hub 22, it is not necessary to change the shape of the bell hub 22 for the detected portion 25, and the outer diameter of the bell hub 22 is increased. Can be prevented. As a result, it is possible to prevent the coating apparatus 1 from becoming large.

  According to the coating apparatus 1 described above, since the magnetic sensor 30 is attached to the holding arm 2, the magnetic sensor 30 is accommodated in the housing 11 as compared with the case where the magnetic sensor 30 is disposed in the housing 11 of each of the coating machines 10A and 10B. The space occupied by the contents can be reduced to increase the internal space. In addition, the magnetic sensor 30 can be easily replaced.

  According to the coating apparatus 1 described above, the direction of one magnetic sensor 30 is changed using the actuator 40 with respect to the detected portions 25 of the two coating machines 10A and 10B, so that the bells of the respective coating machines. A rotational speed of 20 can be detected. At this time, the actuator control unit 52 of the control device 50 controls the actuator 40 in consideration of the directivity of sensitivity to the magnetic field change by the magnetic sensor 30. Thereby, even if it is a case where one magnetic sensor 30 is utilized, the rotation speed of the bell 20 of each coating machine can be detected accurately. Further, by using the magnetic sensor 30, there is no problem of deterioration in detection performance when the rotation speed of the bell 20 is detected using, for example, an optical fiber cable.

  Moreover, the cost of the coating apparatus 1 can be kept low by reducing the number of the magnetic sensors 30 compared with the case where the expensive magnetic sensor 30 is used with respect to each coating machine.

  Hereinafter, another embodiment related to the first embodiment will be described with reference to the drawings. In other embodiments, the same elements as those of the first embodiment are denoted by the same reference numerals, and the description of the same elements is omitted.

(Embodiment 2)
As shown in FIG. 6, the coating apparatus 101 of the second embodiment is different from the first embodiment only in the configuration of the bell hub 122 of the coating machine 110A. That is, in this coating machine 110A, the detected portion 125 is provided on the front surface 122a of the bell hub 122 that rotates integrally with the bell 20 when the air motor 14 is driven. The bell hub 122 is made of the same metal material as the bell hub 22 of the first embodiment. On the other hand, the detected part 125 is configured by a permanent magnet (magnetic material) that is magnetic. The detected portion 125 rotates integrally with the bell 20.

  As shown in FIG. 7, the detected portion 125 has a circular shape by abutting a semicircular and identical N pole 125a and S pole 125b with each other. Both the N pole 125a and the S pole 125b are fixed to the front surface 122a of the bell hub 122 by bonding.

In this detected portion 125, magnetic lines of force are formed from the N pole 125a to the S pole 125b. The direction of the lines of magnetic force becomes the direction of the magnetic field by the detected portion 125. When the bell 20 is rotated by receiving the driving force of the air motor 14, a magnetic field change is generated by the detected portion 125 that rotates integrally with the bell 20. At this time, the magnetic sensor 30 is configured to detect the rotation speed of the bell 20 by detecting a magnetic field change caused by the detected portion 125 when the bell 20 rotates.
Other configurations are the same as those of the first embodiment.

According to the second embodiment, since the detected portion 125 can be fixed to the bell hub 122 by retrofitting, the mounting operation of the detected portion 125 is facilitated.
In addition, the same effects as those of the first embodiment are obtained.

(Embodiment 3)
As shown in FIG. 8, the coating apparatus 201 according to the third embodiment is different from the first embodiment in the target member provided with the detected portion. That is, in the coating machine 210 </ b> A of the coating apparatus 201, the detected portion 225 is provided on the output shaft 16 of the air motor 14 that is located away from the bell 20 in the axial direction X. The detected portion 225 is made of the same metal material as the bell hub 22 of the first embodiment. On the other hand, the to-be-detected part 225 is comprised with the permanent magnet (magnetic body) which magnetizes. The detected portion 225 rotates integrally with the bell 20.

  As shown in FIG. 9, the detected portion 225 has a cylindrical shape by abutting a halved and identical N pole 225a and S pole 225b with each other. Both the N pole 225a and the S pole 225b are fixed to the outer peripheral surface 16a of the output shaft 16 by bonding.

In the detected portion 225, magnetic lines of force are formed from the N pole 225a toward the S pole 225b. The direction of the lines of magnetic force becomes the direction of the magnetic field by the detected portion 225. When the bell 20 is rotated by receiving the driving force of the air motor 14, a magnetic field change is generated by the detected portion 225 that rotates integrally with the bell 20. At this time, the magnetic sensor 30 is configured to detect the rotational speed of the bell 20 by detecting a magnetic field change caused by the detected portion 225 when the bell 20 rotates.
Other configurations are the same as those of the first embodiment.

According to the third embodiment, by providing the detected portion 225 on the output shaft 16 of the air motor 14 which is a separate member from the bell 20 and is away from the bell 20, the bell 20 atomizes and discharges the paint. The painting function is not easily disturbed by the detected part 225.
In addition, the same effects as those of the first embodiment are obtained.

  The present invention is not limited to the above-described embodiment, and various applications and modifications can be considered without departing from the object of the present invention. For example, the following embodiments to which the present embodiment is applied can be implemented.

  In the above-described embodiment, the case where the detected portion for the magnetic sensor 30 is provided on the bell hub 22 of the bell 20 or the output shaft 16 of the air motor 14 has been described. Various members can be employed.

  In the above embodiment, the case where the air motor 14 is used to rotationally drive the bell 20 has been described, but an electric motor can be used instead of the air motor 14.

  In the above-described embodiment, the case where the actuator 40 configured as an air-driven motor is used to change the direction of the magnetic sensor 30 is illustrated. However, as the actuator 40, a solenoid using power obtained by an electromagnet is used. An actuator or a power actuator using hydraulic pressure, water pressure, or electric power can also be used.

  In the above embodiment, the actuator control unit 52 illustrated the case of controlling the actuator 40 so as to switch the orientation of the magnetic sensor 30 with respect to each of the two coating machines 10A and 10B at a preset cycle. It is also possible to set a difference in the monitoring priority between the coating machines 10A and 10B and set the time for which the magnetic sensor 30 is directed to be longer for the higher priority. Or you may make it switch the timing which orient | assigns the magnetic sensor 30 between two coating machine 10A, 10B by switching operation by an operator.

  In the above embodiment, the case where the magnetic sensor 30 is attached to the holding arm 2 that integrally holds the housings 11 of the two coating machines 10A and 10B is illustrated. However, the mounting position of the magnetic sensor 30 is the holding arm 2. For example, the magnetic sensor 30 may be attached to the outer surface 11a of the housing 11 of one of the two coating machines 10A and 10B.

  In the above embodiment, the case where the detected rotational speed of the bell 20 detected by the magnetic sensor 30 is used for the rotational speed feedback control has been exemplified. However, this monitoring rotational speed is not used for the rotational speed feedback control, but is simply monitored. Or may be used for alarm output.

  In each of the above-described embodiments, the case where the detected part for the magnetic sensor 30 is configured by a permanent magnet has been illustrated, but the detected part can also be configured by a magnetic material different from the permanent magnet. For example, an electromagnet that generates a magnetic force by energizing the coil may be used for the detected part.

  In each of the above-described embodiments, a coating apparatus including two coating machines has been illustrated, but the number of coating machines included in the coating apparatus is not limited to two, and three or more as necessary. Also good.

DESCRIPTION OF SYMBOLS 1,101,201 Rotary atomization coating apparatus 2 Holding arm 11 Housing 11a Outer surface 14 Air motor (drive part)
16 Output shaft 20 Rotating atomizing head (bell)
21 Bell cup 22, 122 Bell hub 24 Paint distribution hole 25, 125, 225 Detected part 30 Magnetic sensor (MI sensor)

Claims (5)

A rotary atomizing head that atomizes and discharges paint by rotation;
A detected portion having magnetism and rotating integrally with the rotary atomizing head;
With
A rotary atomizing coating apparatus configured to detect the number of rotations of the rotary atomizing head by a magnetic sensor detecting a magnetic field change caused by the detected portion when the rotary atomizing head rotates.   The rotary atomizing head includes a bell cup having a cup shape, and a bell hub provided at a central portion in the radial direction of the bell cup and forming a paint circulation hole between the bell cup and the bell hub. The rotary atomizing coating apparatus according to claim 1, wherein a detected portion is provided.   The rotary atomizing coating apparatus according to claim 2, wherein the detected part is embedded in the bell hub.   The rotary atomizing coating apparatus according to claim 1, further comprising a drive unit having an output shaft for rotationally driving the rotary atomizing head, wherein the detected portion is provided on the output shaft of the drive unit.   A holding arm that holds a housing that accommodates the rotary atomizing head and the detected portion is provided, and the magnetic sensor is attached to one of the holding arm and the outer surface of the housing. 5. The rotary atomizing coating apparatus according to any one of 4 above.

Images