JP2017035659A - Coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a rotary atomizing head at a necessary rotation frequency without increasing a pressure loss generated in an exhaust flow passage, even when drive air of an air motor for driving the rotary atomizing head is supplied in large quantities at a high pressure.SOLUTION: A rotary atomizing head (3) is fitted to the tip of a hollow rotary shaft (12) of an air motor (4) built in a coating machine body (2). An air supply channel (6) of a drive air for driving the air motor (4) and an exhaust flow passage (7) for discharging exhaust air are connected to the coating machine body (2), and a suction discharge mechanism (8) for sucking exhaust air from the air motor (4) and discharging it forcibly toward the outside is provided in the exhaust flow passage (7).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating apparatus that atomizes and sprays paint with a rotary atomizing head that is rotationally driven by an air motor.

This type of coating device has a rotary atomizing head attached to the tip of a hollow rotating shaft that is driven to rotate at high speed by an air motor built in the coating machine body, and is supplied via a feed tube inserted into the hollow rotating shaft. The coated paint is sprayed by centrifugal atomization with the rotary atomizing head.
The air motor is formed by integrally forming an air turbine on a hollow rotating shaft, and is driven to rotate by blowing drive air (compressed air) to the air turbine.

In this case, if the exhaust air discharged from the air turbine can be discharged from an exhaust port formed in the side surface of the coating machine main body or the like, the pressure loss can be suppressed and energy efficiency is excellent.
However, in this case, when the exhaust air is discharged from the exhaust port to the atmosphere, the periphery of the exhaust port formed by adiabatic expansion is supercooled, and depending on the season, the peripheral surface of the coater may condense and water drops Drops on the workpiece, causing a problem of poor painting.
For this reason, conventionally, an exhaust passage for guiding exhaust air to a place away from the coating machine is generally formed by an exhaust hose or the like.

On the other hand, recently, it is possible to apply a wide range of discharge rates from a small discharge volume to a large discharge volume with a single coating device. Also, it can be used for coating with different types of paints, from low viscosity paints to high viscosity paints. There is a demand for the development of coating equipment that can cope with this.
When supplying a large amount of paint to paint with a large discharge amount or painting with a high-viscosity paint, if the drive air that drives the air motor is supplied with the conventional pressure, rotation of the rotating atomizing head is caused by the paint load. Since the number decreases and a good atomization state cannot be obtained, it is necessary to supply a large amount of drive air at a higher pressure in order to maintain the rotary atomizing head at the required rotational speed.

  However, when the supply amount of drive air increases, the pressure loss of the exhaust passage increases, the back pressure of the air turbine does not escape, and the pressure in the space in the coating machine main body from the exhaust port of the air motor to the exhaust passage increases. Therefore, not only cannot the rotating atomizing head be maintained at the required number of revolutions, but also leaked air flows into the rotating atomizing head through the hollow rotating shaft, further adversely affecting the atomization state of the paint.

For this reason, providing the exhaust port which connects the inside and outside of a hollow rotating shaft in the side surface of a hollow rotating shaft is proposed (refer patent document 1).
However, according to the experiments of the present inventor, even if the exhaust port is provided in the hollow rotary shaft, the back pressure is not sufficiently reduced, and thus the above-mentioned problem cannot be solved.

International Publication No. 2015/004966 Pamphlet

  Therefore, the present invention can maintain the rotary atomizing head at the required rotational speed without increasing the pressure loss generated in the exhaust passage even when supplying a large amount of drive air at a higher pressure. It is a technical problem to prevent the atomization defect from flowing into the atomizing head.

In order to solve this problem, the present invention provides a coating apparatus in which a rotary atomizing head is attached to the tip of a hollow rotating shaft of an air motor built in a coating machine body.
An air supply passage for drive air that drives an air motor and an exhaust passage for exhausting the exhaust air are connected to the coating machine body,
The exhaust passage is provided with a suction / discharge mechanism that sucks exhaust air of an air motor and forcibly discharges the air toward the outside.

  According to the present invention, the exhaust passage for discharging the exhaust air of the air motor is provided with a suction discharge mechanism such as a pump, an ejector pump, a turbo inhaler, etc., so that the exhaust air discharged from the air motor passes through the exhaust passage. It is sucked and forcibly discharged toward the outside.

Therefore, since the back pressure of the air motor is released and the pressure loss of the exhaust flow path is reduced, even if a large amount of drive air is supplied at a higher pressure, the rotary atomizing head rotates as necessary without increasing the pressure loss generated in the exhaust flow path. Can be maintained in numbers.
Further, since the pressure loss of the exhaust passage can be reduced, the leaked air does not flow into the rotary atomizing head and the paint with poor atomization is not sprayed.

Explanatory drawing which shows an example of the coating device which concerns on this invention. Explanatory drawing which shows the Example. Explanatory drawing which shows the coating device which feedback-controls back pressure. Explanatory drawing which shows the Example which performs back loop control of back pressure. Explanatory drawing which shows the other Example which performs back loop control of back pressure.

The present invention achieves the purpose of maintaining the rotational atomizing head at the required rotational speed without increasing the pressure loss generated in the exhaust passage even when supplying a large amount of drive air at a higher pressure. In the coating device with the rotary atomizing head attached to the tip of the hollow rotary shaft of the air motor built in the machine body,
An air supply passage for drive air that drives an air motor and an exhaust passage for exhausting the exhaust air are connected to the coating machine body,
The exhaust passage is provided with a suction / discharge mechanism that sucks exhaust air from the air motor and forcibly discharges it toward the outside.

  FIG. 1 is an example of a coating apparatus according to the present invention. The coating apparatus 1 includes an air motor 4 that rotates and rotates a rotary atomizing head 3 in a coating machine body 2, and a drive that drives the air motor 4. An air supply / exhaust system 5 is connected.

The air motor 4 is configured such that an air turbine 13 is integrally attached to the rear end side of the hollow rotary shaft 12 supported by a radial bearing 11.
A rotary atomizing head 3 is attached to the tip of the hollow rotating shaft 12, and a feed tube 10 for supplying a coating material or a cleaning fluid to the rotating atomizing head 3 is inserted into the hollow inside of the hollow rotating shaft 12.
The air motor 4 has an air supply port 14 formed on the outer periphery of the air turbine 13 and an exhaust port 15 through which exhaust air flows out on the back side.

  The rotary atomizing head 3 is formed with a paint chamber 22 for receiving the supply of paint from the feed tube 10 on the back side thereof via a bell inner 21 disposed opposite to the opening at the front end of the feed tube 10. A rim 23 having a substantially frustoconical surface is formed.

  In addition, a paint outflow hole 24 is formed in the peripheral portion of the bell inner 21 to allow the paint in the paint chamber 22 to flow out to the rim 23 side by centrifugal force when the rotary atomizing head 3 is rotated. Is formed with a cleaning channel 25 for cleaning the front side of the bell inner 21 by allowing the cleaning liquid supplied into the paint chamber 22 to flow out during cleaning.

  The drive air supply / exhaust system 5 includes an air supply passage 6 that supplies drive air of a predetermined pressure that rotationally drives the air turbine 13 of the air motor 4, and an exhaust passage 7 that discharges the exhaust air.

  The air supply flow path 6 has an upstream side connected to a pressure source C such as a compressor or an air pump, and a downstream side connected to the back side of the coating machine main body 2, and the drive supplied via the air supply flow path 6. Air is blown from the air supply port 14 to the air turbine 13 through the air flow path 16 in the coating machine body 1, and the air turbine is rotationally driven.

  The upstream side of the exhaust passage 7 is connected to the back side of the coating machine main body 2, and the downstream side reaches the outside away from the coating machine main body 2, and the exhaust air discharged from the exhaust port 15 of the air motor 4 is exhausted. The air passes through the air passage 17 in the coating machine body 1 and is discharged to the outside through the exhaust passage 7.

  The exhaust passage 7 is connected to a suction / discharge mechanism 8 that sucks exhaust air from the air turbine 13 and forcibly discharges it toward the outside. As shown in FIG. 2, an ejector pump 31 is used.

The ejector pump 31 includes a nozzle 34 on the inflow side and a diffuser 35 on the outflow side along a primary air flow path 33 that penetrates the vacuum chamber 32. The exhaust passage 7 is connected to the secondary air inlet 36.
A branch flow path 6 a branched from the pressure supply source C from the air supply flow path 6 is connected to the primary air flow path 33 supplied to the nozzle 34 and the diffuser 35.
The primary air flow path 33 may be connected to a compressed air supply flow path supplied from a separate pressure generation source from the pressure generation source C.

The above is one configuration example of the present invention, and the operation thereof will be described next.
If the paint is supplied through the feed tube 10 while driving the air motor 4 by supplying the drive air through the air supply passage 6 and driving the rotary atomizing head 3, the paint is supplied to the rotary atomizing head 3. Centrifugal atomization is performed and sprayed, and the exhaust air of the air motor 4 is discharged to the outside through the exhaust passage 7.

  At this time, if compressed air is supplied from the pressure source C to the primary air flow path 33 of the ejector pump 31 through the branch flow path 6a as necessary, the pressure in the vacuum chamber 32 decreases. Exhaust air from the air motor 4 is sucked through the exhaust passage 7 connected to the secondary air inlet 36 and is forcibly exhausted toward the outside.

  Note that the degree of vacuum in the vacuum chamber 32 can be adjusted by the flow rate of the primary side air, so that the primary side air is supplied at a flow rate that cancels this in accordance with the pressure loss generated on the exhaust flow path 7 side. As a result, the back pressure of the air turbine 13 can be appropriately reduced.

  Therefore, in order to maintain the rotational speed of the rotary atomizing head 3 when supplying paint with a large supply amount or when applying high viscosity paint, a large amount of drive air is supplied from the pressure source C at a higher pressure. Also in the case of supply, if the flow rate of the primary air is increased accordingly, the exhaust air of the air motor 4 is sucked through the exhaust passage 7 and is forcedly discharged to the outside. The back pressure of 13 can be reduced moderately.

In this way, even when a large amount of drive air is supplied at a high pressure, the exhaust air is sucked from the exhaust passage 7 and forcibly discharged, so that the exhaust port 15 of the air motor 4 enters the exhaust passage 7. The pressure in the space inside the main body 2 of the coating machine does not increase.
Therefore, even when the paint is supplied at a large supply amount or when the high-viscosity paint is supplied for coating, not only the rotary atomizing head 3 can be maintained at the necessary rotation speed, but also the leaked air is caused by the hollow rotary shaft 12. It does not flow into the rotary atomizing head 3 through the inside, and the air pressure does not adversely affect the atomization state of the paint.

In this example, a turbo inhaler 41 is used as the suction / discharge mechanism 8 as shown in FIG.
The turbo inhaler 41 is integrally formed by fixing an air supply turbine 43 interposed in the air supply passage 6 and an exhaust turbine 44 interposed in the exhaust passage 7 at both ends of the rotating shaft 42. ing.
The intake turbine 43 is rotationally driven by drive air (compressed air) flowing through the supply air flow path 6, and the exhaust turbine 44 is a direction in which the air in the exhaust flow path 7 is discharged to the outside as the supply air turbine 43 rotates. It is formed so as to be driven to rotate.

  According to this, when drive air is supplied from the pressure generation source C to drive the air motor 4, the turbo inhaler 41 is driven at the same time as the air motor 4 is rotationally driven and discharged from the exhaust port 15 of the air motor 4. Exhaust air can be sucked by the exhaust turbine 44 interposed in the exhaust flow path 7 and forcedly discharged to the outside.

  In addition, since the supply turbine 43 is rotated by the supply pressure of the drive air flowing through the supply air flow path 6 and the exhaust turbine 44 is driven, the rotation speed depends on the supply pressure of the drive air, and the supply pressure of the drive air is If it becomes higher, the exhaust flow rate from the exhaust passage 7 is also automatically increased.

Furthermore, if the suction pump 45 is used as the suction / discharge mechanism 8 as shown in FIG. 2C and the exhaust flow path 7 is connected to the inlet thereof, the drive air is supplied at a higher pressure and a larger flow rate. By driving the suction pump 45, the exhaust air of the air motor 4 is sucked from the exhaust passage 7 and is forcibly discharged to the outside.
Therefore, in this case as well, the rotary atomizing head 3 can be maintained at the required rotational speed, and leaked air flows into the rotary atomizing head 3 through the hollow rotary shaft 12 or by the air pressure. Does not adversely affect the atomization state of the paint.

  FIGS. 3A to 3C are explanatory diagrams illustrating an example in which feedback control is performed to maintain the back pressure (exhaust pressure) of the air turbine 13 at a target pressure, and is common to FIGS. 1 and 2. Parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 3A is a basic configuration diagram, and in this example, a suction / discharge mechanism 8 provided in the exhaust flow path 7 of the electrostatic coating apparatus 1 includes a suction amount adjuster 51 for adjusting the suction amount, A pressure sensor 52 that measures the back pressure (exhaust pressure) of the air motor 4 and a control device 53 that performs feedback control to operate the suction amount adjuster 51 based on the measured pressure and maintain the back pressure at the target pressure. It has.

The pressure sensor 52 is attached to, for example, a back pressure space 9 in the coating machine body 2 formed between the exhaust port 15 of the air motor 4 and the inflow port of the exhaust flow path 7, and is connected to the input terminal of the control device 53. Has been.
The installation location of the pressure sensor 52 is not limited to the back pressure space 54, but may be any location as long as the back pressure is reflected, such as in the exhaust passage 7.

  The control device 53 includes an input device 54 such as a mouse / keyboard, a memory 55 in which target pressure and other necessary data are set in advance, a display 56 for displaying necessary data, and an operation amount of the suction amount adjuster 51. It is comprised with the computer provided with the arithmetic processing unit 57 which outputs the control signal which increases / decreases.

The back pressure measured by the pressure sensor 52 is input to the arithmetic processing unit 57 and compared with the target pressure read from the memory 55.
The arithmetic processing unit 57 outputs a control signal for increasing the suction amount when the back pressure is higher than the target pressure, thereby reducing the back pressure to the target pressure, and when the back pressure is lower than the target pressure, a control signal for decreasing the suction amount. By outputting, the back pressure is increased to the target pressure. When the back pressure is within the allowable range of the target pressure, the current control signal is continuously output to maintain the suction amount and maintain the back pressure.

  The target pressure set in the memory 55 is not limited to a single pressure value that is considered to be the optimum value, but a plurality of pressure values that differ depending on the type of paint, and the discharge amount (supply amount) of the paint. A plurality of pressure values that differ depending on the air motor, a plurality of pressure values that differ depending on the number of revolutions of the air motor, and a plurality of pressure values that differ according to the application site, for example, according to a preset program, It is also possible to read out and control the target pressure according to the above.

FIG. 3B is a configuration diagram when the ejector pump 31 is used as the suction / discharge device 8. In this case, a regulator (pressure regulator) 58 that regulates the supply pressure of compressed air is used as the suction amount regulator 51. The primary air flow path 33 that receives the supply of compressed air is provided on the inflow side.
In the regulator 58, the valve opening degree is adjusted by the control signal output from the control device 51, the supply pressure of the primary air changes, and as a result, the degree of vacuum in the vacuum chamber 32 changes, The amount of suction is adjusted.

Therefore, if the back pressure detected by the pressure sensor 52 is higher than the target pressure, a control signal for opening the valve opening of the regulator 58 is output.
If the valve opening of the regulator 58 is increased, the supply pressure of the primary side air is increased, so that the degree of vacuum of the vacuum chamber 32 is increased and the amount of exhaust air sucked from the exhaust passage 7 is increased. Back pressure decreases.

If the back pressure detected by the pressure sensor 52 is lower than the target pressure, a control signal for closing the valve opening of the regulator 58 is output.
When the valve opening of the regulator 58 is reduced, the supply pressure of the primary air is reduced, so that the degree of vacuum in the vacuum chamber 32 is lowered and the amount of exhaust air sucked from the exhaust passage 7 is reduced. Back pressure rises.
Thus, the valve opening of the regulator 58 is adjusted by the control device 53 in accordance with the back pressure detected by the pressure sensor 52, the amount of exhaust air sucked from the exhaust passage 7 is adjusted, and the back pressure is reduced. Feedback control is performed so as to maintain a preset target pressure.

FIG. 3C is a configuration diagram when an electric suction pump 45 is used as the suction / discharge device 8. In this case, the suction pump 45 is driven by a drive motor 59 having a variable rotation speed, and the motor 59 Is used as the suction amount adjuster 51.
The rotational speed of the drive motor 59 is increased or decreased by a control signal output from the control device 53, and thereby the amount of exhaust air sucked by the suction pump 45 is adjusted.

Therefore, if the back pressure detected by the pressure sensor 52 is higher than the target pressure, a control signal for increasing the rotational speed of the drive motor 59 is output, and the suction amount of the suction pump 45 increases. As a result, the back pressure is increased. descend.
If the back pressure detected by the pressure sensor 52 is lower than the target pressure, a control signal for reducing the rotation speed of the drive motor 59 is output, and the suction amount of the suction pump 45 is reduced. As a result, the back pressure is reduced. To rise.

  As described above, the rotational speed of the drive motor 59 of the suction pump 45 is increased or decreased by the control device 53 in accordance with the back pressure detected by the pressure sensor 52, and the suction amount of the exhaust air from the exhaust passage 7 is adjusted. Therefore, feedback control is performed so that the back pressure is maintained at a preset target pressure.

  FIGS. 4A to 4C are explanatory views showing an embodiment in which the open loop control is performed so that the back pressure (exhaust side pressure) of the air motor 4 becomes the target pressure, and is common to FIGS. Parts are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 4A is a basic configuration diagram. In this example, the suction / discharge mechanism 8 adjusts the back pressure by operating the suction amount adjuster 51 for adjusting the suction amount and the suction amount adjuster 51. Although it is the same as the embodiment of FIG. 3A in that the control device 53 is provided, it is different in that a pressure sensor for detecting a back pressure to be controlled is not provided because open loop control is performed.
Further, in the memory 55 of the control device 53, the control parameter corresponding to the exhaust air suction amount is specified by at least one of “paint type”, “rotation speed of the air motor 4”, and “paint supply amount”. A target value table 61 corresponding to the conditions is set in advance.

In the arithmetic processing unit 57, the coating condition data written in the coating program for coating the workpiece conveyed by the conveyor is read, and the coating condition data is referred to the target value table 61 set in the memory 55. The control parameter corresponding to is read, and the control parameter is output to the suction amount adjuster 51.
The control parameter is a value corresponding to the suction amount of the exhaust air set for each painting condition, and an arbitrary numerical value can be set according to the type of the suction / discharge device 8. In the present example, FIG. When the ejector pump 31 shown in b) is used as the suction / discharge device 8, the supply pressure of the primary air is used as a control parameter.

As a result, the control parameter is output from the control device 53 according to the coating conditions specified by the “type of paint”, “rotation speed of the air motor 4”, “paint supply amount”, etc. at that time, and suction is performed according to the control parameters. The quantity adjuster 51 is operated.
Since the control parameter corresponds to the suction amount of the suction / discharge mechanism 8, by operating the suction amount adjuster 51 with the control parameter, the suction / discharge mechanism 8 exhausts with an appropriate suction amount according to the coating conditions. Since air is sucked, the back pressure is maintained at an appropriate value.

  FIG. 4B is a configuration diagram when the ejector pump 31 is used as the suction / discharge device 8. In this case, the suction amount adjuster 51 adjusts the supply pressure of the compressed air supplied to the primary air flow path. The primary air supply pressure (gauge pressure) is used as a control parameter.

When the rotary atomizing head 3 is rotationally driven by the air motor 4 and the supply of paint is started, the processing of the arithmetic processing unit 57 of the control device 53 is started. First, the coating conditions are read from the coating program or the like, Next, control parameters corresponding to the coating conditions are read from the target value table 61 and output to the regulator 58.
In the regulator 58, a valve opening degree is set according to the supply pressure of the primary side air, which is a control parameter, and when the control parameter is input, the valve opening degree is adjusted according to the parameter.
Accordingly, the primary air is supplied at a supply pressure corresponding to the control parameter, whereby the exhaust air is sucked through the exhaust flow path 7, and the back pressure of the air motor 4 is set to an appropriate value according to the coating conditions. .

  FIG. 4C is a configuration diagram when an electric suction pump 45 is used as the suction / discharge device 8. In this case, a drive motor 59 that controls the rotational speed of the pump 45 is used as the suction amount adjuster 51. The rotation speed of the drive motor 59 is set as a control parameter corresponding to the suction amount of the suction pump 45.

  When the rotary atomizing head 3 is rotationally driven by the air motor 4 and the supply of paint is started, the processing of the arithmetic processing unit 57 of the control device 53 is started. First, the coating conditions are read from the coating program or the like, Next, control parameters corresponding to the coating conditions are read from the target value table 61 and output to the drive motor 59.

When the rotational speed that is a control parameter is input, the drive motor 59 is rotated at the rotational speed specified by the parameter.
Therefore, the exhaust air is sucked with a suction amount corresponding to the coating conditions, and as a result, the back pressure of the air motor 4 is set to an appropriate value.

  The control parameters are not limited to those set in the target value setting table 61, but are set as a function of control factors of coating conditions such as the rotation speed of the air motor and the amount of paint supplied, and control is performed based on the input control factor values. The parameter may be calculated.

For example, FIG. 5 shows a function for determining a control parameter for each paint supply amount on a coordinate 62 with the rotation speed of the air motor as the horizontal axis and the supply pressure of the primary side air as the control parameter as the horizontal axis. It is a graph display.
According to this, for example, the rotation speed of the air motor 4 is detected by the encoder 63, and the paint supply amount (discharge amount) is monitored by the flow rate sensor 65 arranged in the paint supply system 64. The control parameter can be determined according to the function set in the coordinate 62 in accordance with the paint supply amount.

  INDUSTRIAL APPLICABILITY The present invention can be applied to the application of a coating apparatus in which a rotary atomizing head that atomizes paint is rotated by an air motor built in the main body of the coating machine.

DESCRIPTION OF SYMBOLS 1 Coating apparatus 2 Coating machine main body 3 Rotating atomizing head 4 Air motor 5 Drive air supply / exhaust system 6 Air supply flow path 7 Exhaust flow path 8 Suction / discharge mechanism 31 Ejector pump 32 Vacuum chamber 33 Primary side air flow path 34 Nozzle 35 Diffuser 36 Two Secondary side air inlet 41 Turbo suction device 42 Rotating shaft 43 Supply turbine 44 Exhaust turbine 45 Suction pump 51 Suction amount regulator 52 Pressure sensor 53 Control device

Claims (10)

In the coating device where the rotary atomizing head is attached to the tip of the hollow rotating shaft of the air motor built in the coating machine body,
An air supply passage for drive air that drives an air motor and an exhaust passage for exhausting the exhaust air are connected to the coating machine body,
A coating apparatus, wherein a suction / discharge mechanism for sucking exhaust air from an air motor and forcibly discharging it toward the outside is provided in the exhaust flow path.   The paint according to claim 1, wherein the suction / discharge mechanism is an ejector pump that sucks the secondary side air by injecting the primary side air, and the exhaust passage is connected to a secondary side air inlet of the ejector pump. apparatus. The suction / discharge mechanism is composed of a turbo inhaler in which an air supply turbine interposed in an air supply passage and an exhaust turbine interposed in an exhaust passage are integrally formed at both ends of a rotating shaft,
The air supply turbine is rotationally driven by compressed air passing through the air supply flow path,
The coating apparatus according to claim 1, wherein the exhaust turbine is rotationally driven in a direction in which the exhaust in the exhaust passage is discharged to the outside along with the rotation of the supply turbine.   The coating apparatus according to claim 1, wherein the suction / discharge mechanism is a suction pump, and the exhaust passage is connected to an inlet of the suction pump.   A suction amount adjuster for adjusting the suction amount of the suction / discharge mechanism, a pressure sensor for measuring the pressure on the exhaust side of the air motor, and an arithmetic processing unit for operating the suction amount adjuster based on the measured pressure. Item 1. A coating apparatus according to item 1. The suction / discharge mechanism is an ejector pump that sucks the secondary side air by flowing in the primary side air, and the exhaust flow path is connected to the secondary side air inlet of the ejector pump,
The coating apparatus according to claim 5, wherein the suction amount adjuster is a pressure adjuster that variably controls a supply pressure of primary air of the ejector pump.   6. The coating apparatus according to claim 5, wherein the suction / discharge mechanism is a suction pump, the exhaust passage is connected to an inlet of the suction pump, and the suction amount adjuster includes a variable speed motor that drives the suction pump. A suction amount adjuster for adjusting the suction amount of the suction discharge mechanism, and a control device for operating the suction amount adjuster;
In the control device, the control parameter corresponding to the target pressure on the exhaust side of the air motor is preset as a target value depending on the coating condition specified by at least one of the type of paint, the amount of paint supplied, and the number of rotations of the air motor, The coating apparatus according to claim 3, wherein control for operating the suction amount adjuster is performed based on a control parameter read according to the coating condition. The suction / discharge mechanism is an ejector pump that sucks the secondary side air by flowing in the primary side air, and the exhaust flow path is connected to the secondary side air inlet of the ejector pump,
The suction amount regulator is composed of a regulator that controls the supply pressure of the primary air flow path,
The coating apparatus according to claim 8, wherein the control parameter is a supply pressure of primary air. The suction / discharge mechanism is a suction pump, the exhaust flow path is connected to an inlet of the suction pump, and the suction amount adjuster comprises a rotation speed variable motor that drives the suction pump;
The coating apparatus according to claim 8, wherein the control parameter is a rotation speed of a suction pump.

Images