JP2017087106A - Spray coating apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable automatic coating in a set coating line width.SOLUTION: A spray coating apparatus comprises: a liquid discharge nozzle 51 having a discharge hole 51A supplied with a liquid coating material; a needle 50 inserted to be capable of freely advancing into and retreating out of the discharge hole of the liquid discharge nozzle to adjust the opening of the discharge hole; an actuator 70 that drives the advances and retreat of the needle; a coating material supply unit that includes a liquid pressure adjuster 22 to supply the liquid coating material into the discharge hole under pressurization; an air supply unit that includes an air pressure adjuster 23 to supply atomization air for converging the coating material jetted out of the nozzle hole; an input unit 13 that inputs at least a desired coating width and the viscosity of the liquid coating material; and a control unit 11 that determines liquid pressure and air pressure, respectively, in accordance with at least the coating width and the viscosity inputted from the input unit, to control the liquid pressure adjuster and the air pressure adjuster, and Controls the actuator to adjust the opening of the discharge hole in accordance with at least the input coating width.SELECTED DRAWING: Figure 15

Description

  In the present invention, liquid materials such as a liquid photoresist agent, a moisture-proof insulating agent, a surface protective film, and a functional coating agent are sprayed on the surface of an object to be coated such as a semiconductor silicon chip, a glass substrate, various mounting substrates, and metal members. More particularly, the present invention relates to a spray coating apparatus and method capable of easily changing the spray coating width.

  For semiconductor silicon, glass substrates, and mounted circuit boards, various functional liquid coating agents, moisture-proof insulating materials, and the like are partially applied.

  Also, in recent small circuit boards with high-density mounting, in addition to moisture-proof insulating materials, heat-dissipating heat conductive materials and conductive adhesives are locally applied, and liquids are used to provide various functional effects. There is also a need to apply the material locally.

  In such partial or local application of liquid material, scattering of the liquid material becomes a problem, and in many cases, it is necessary to provide masking in an area where application is not required. It leads to cost increase.

  The present inventor can form a clear coating spray width without producing a foam surface or a layer of coating film that causes a coating film defect, and can be selectively applied to a mounted circuit board that requires masking without masking. A liquid material injection valve that can be coated on the surface has been proposed (Patent Document 1).

Utility Model Registration No. 3191270

  An object of the present invention is to make it possible to easily set the coating line width by using the previously proposed liquid material injection valve or a similar injection valve.

  Another object of the present invention is to provide a spray coating apparatus and method capable of coating a liquid material with a set coating line width.

  A spray coating apparatus according to the present invention includes a liquid discharge nozzle having a discharge hole to which a liquid coating material is supplied, a needle that is movably inserted into the discharge hole of the liquid discharge nozzle and adjusts the opening of the discharge hole, An actuator for driving the needle forward and backward, a liquid pressure regulator, a coating material supply device that pressurizes the liquid coating material and supplies the liquid coating material to the discharge hole, and an air pressure regulator, and a coating material ejected from the nozzle hole Air supply device for supplying atomized air to be converged, input means for inputting at least a desired application width and viscosity of the liquid application material, and liquid pressure and air according to at least the application width and viscosity input from the input means Determine the pressure to control the liquid pressure regulator and the air pressure regulator, and discharge holes according to at least the input coating width In which a control device for controlling the actuator in order to adjust the degree of opening.

  The present invention also provides a spray coating method. That is, a liquid discharge nozzle having a discharge hole to which a liquid application material is supplied, a needle that is inserted into the discharge hole of the liquid discharge nozzle so as to freely advance and retract, and drives the needle forward and backward. An atomizing air that includes an actuator, a liquid pressure regulator, and a coating material supply device that pressurizes the liquid coating material and supplies the liquid coating material to the discharge hole, and an air pressure regulator, and converges the coating material ejected from the nozzle hole In the spray coating apparatus including the air supply device for supplying the liquid, the spray coating method according to the present invention includes at least input means for inputting a desired coating width and viscosity of the liquid coating material, and at least the coating width input from the input means. The fluid pressure regulator and the air pressure regulator are controlled by determining the fluid pressure and the air pressure according to the viscosity. And it is for controlling the actuator in order to adjust the degree of opening of the discharge hole in response to the inputted at least the coating width.

  As a result of the inventor's many experiments and trials and errors, it has been found that the coating width by the spray ejected from the liquid ejection noise in the spray coating apparatus is strongly related to the viscosity of the liquid coating material. In addition, the inventor has found that a liquid having a given viscosity is determined by the liquid pressure for supplying the liquid to the discharge nozzle, the air pressure for atomization, and the opening of the discharge hole. Got. Therefore, if the desired application width and viscosity of the liquid to be used are given from the input means, the liquid pressure, the air pressure and the opening of the discharge hole can be determined. Application of a desired application width can be obtained by controlling the liquid pressure, air pressure, and opening of the application material so as to realize. According to the present invention, it is possible to automatically realize application with an application width set by the user.

  In a preferred embodiment of the present invention, an air pressure value setting condition table for storing an air pressure value corresponding to the coating width range and the viscosity range, and a hydraulic pressure corresponding to the coating width range and the viscosity range are stored. A storage device is further provided for storing a hydraulic pressure value setting condition table and an opening setting condition table for storing the discharge hole opening corresponding to the range of the application width. In this case, the control device can set the air pressure value, the hydraulic pressure value, and the discharge hole opening by referring to the setting condition tables.

  In one embodiment, the spray coating apparatus according to the present invention further includes a coating preparation apparatus including a disposal station.

  In a preferred embodiment, the coating preparation device includes a concentration detection device that detects the concentration of the spray pattern to be discarded. Thereby, it can be confirmed whether it is a coating liquid of a desired density | concentration.

  In a further preferred embodiment, the coating preparation device includes a width detection device that detects the width of the spray pattern to be blown away. Thereby, it can be known in advance whether a desired coating width is realized. The concentration detection device and the width detection device are not limited to the spray coating device according to the present invention, and can be generally used. The concentration detection device can be applied to general liquid concentration detection, and the width detection device can be applied to detection of the width of a solid such as a bar.

  The spray coating apparatus according to the present invention comprises an input means for inputting at least a desired coating width and a viscosity of a liquid coating material, an air pressure value setting condition table for storing an air pressure value corresponding to the coating width range and the viscosity range, Storage device for storing hydraulic pressure value setting condition table for storing hydraulic pressure corresponding to application width range and viscosity range, and opening setting condition table for storing discharge hole opening corresponding to application width range And a control device for determining the liquid pressure, the air pressure and the opening of the discharge hole with reference to each of the set condition tables according to at least the coating width and the viscosity input from the input means.

  According to the present invention, as long as a desired coating width and the viscosity of the liquid coating material to be used are input, the liquid pressure, the air pressure, and the discharge hole opening are automatically determined.

It is a perspective view which shows the outline | summary of the whole structure of a spray coating system. It is a longitudinal cross-sectional view which shows the whole structure of the application | coating valve apparatus, and shows the state which the discharge hole has closed. It is a longitudinal cross-sectional view which shows the whole structure of the application | coating valve apparatus, and shows the state which the discharge hole has opened. It is an enlarged view of a liquid discharge nozzle and an extension part, and shows a liquid discharge state. It is an expanded sectional end view which follows the VV line of FIG. A portion centered on the liquid discharge nozzle is further enlarged to show a liquid discharge operation stop state (corresponding to FIG. 2). The portion centered on the liquid discharge nozzle is further enlarged and shows the liquid discharge state (corresponding to FIG. 3). It is a front view of a screw adapter. It is a top view of a screw adapter. It is a perspective view which shows an application | coating preparation apparatus. The structure of a width | variety detection apparatus (width | variety sensor) and a density | concentration detection apparatus (density | concentration sensor) is shown. The structure of a width | variety detection apparatus (width | variety sensor) and a density | concentration detection apparatus (density | concentration sensor) is shown. The coating liquid material and the air piping system are shown. An electrical control system is shown. (A) shows the setting condition table for the atomizing air pressure value, (B) shows the setting condition table for the opening value, and (C) shows the setting condition table for the hydraulic pressure value. An example of the display screen of the display device is shown. (A) is a preset screen and (B) is an operating condition screen.

  FIG. 1 shows an outline of the overall configuration of a spray coating system.

  A housing 19 of the spray coating system 10 is provided on a machine base 19A and has a work port 10A on the front surface. An object 9 to be painted is placed in the housing 19. A coating valve device 20 is disposed above the object 9, and this coating valve device 20 is supported by the robot device 14 and is movable in the three-dimensional directions of the X, Y, and Z directions. On the upper front surface of the housing 19, a control panel 21, display lamps, operation buttons and the like are arranged. A liquid coating material tank 29, a flow meter 24, and the like are provided slightly above the side surface (right side in FIG. 1) of the housing 19. A control device (computer system) 11 and a CRT display device 12 are provided at an intermediate height position on the side surface of the housing 19.

  2 and 3 are longitudinal sectional views showing the overall configuration of the application valve device 20, and FIG. 2 shows a state in which the discharge hole (nozzle hole) is closed and the application valve device 20 stops the liquid discharge operation. FIG. 3 shows a state where the discharge hole is opened and liquid is discharged. FIG. 4 is an enlarged view of the liquid discharge nozzle and the extension portion, and shows a liquid discharge state (corresponding to FIG. 3). FIG. 5 is an enlarged cross-sectional end view taken along line VV in FIG. 6 and 7 are enlarged views showing a portion around the liquid discharge nozzle. FIG. 6 shows a liquid discharge operation stop state (corresponding to FIG. 2), and FIG. 7 shows a liquid discharge state (corresponding to FIG. 3). Show.

  2 and 3, a fluid body 30 is located slightly below the coating valve device 20, and reaches the liquid discharge nozzle 51 from the fluid body 30 downward through the extension portion 40. The upper part of the fluid body 30 is a drive unit.

  The fluid body 30 and the extension part 40 will be described with reference to FIGS. In the fluid body 30, a liquid coating material introduction hole 31 and a compressed atomized air (air) introduction hole 34 are formed in the lateral direction. A liquid coating material supply pipe 32 is connected to the introduction hole 31. A compressed atomizing air supply pipe 35 is connected to the introduction hole 34. The fluid body 30 is fixed to the cylinder joint 61 thereabove by a plurality of bolts (not shown) penetrating from the bottom to the top of FIG. Has been.

  The liquid coating material introduction hole 31 is bent downward at the center of the fluid body 30 (this portion is referred to as a center hole 33). The cross section of the center hole 33 is circular. The compressed atomizing air introduction hole 34 also bends and extends downward at a position separated from the center hole 33 (this portion is referred to as a communication hole 36). A liquid discharge needle 50 passes through the center hole 33 with a gap between the center hole 33 and the inner surface of the center hole 33. A bearing portion 37 including an O-ring is provided above the center hole 33 of the fluid body 30. The needle 50 is supported by an O-ring of the bearing portion 37 so as to be movable up and down while maintaining airtightness.

  A boss 30A protrudes downward from the lower portion of the fluid body 30, and an upper end portion of an extension outer tube 42 extending downward is fixed to the boss 30A by screwing. A female thread is formed on the lower inner surface of the center hole 33 of the fluid body 30, and the male thread at the upper end of the extension inner tube 41 is screwed to the female thread and fixed thereto. The needle 50 extends downward with a slight gap between it and the inner surface of the extension inner tube 41. A compressed air supply path 43 having an annular cross section is formed between the extension inner pipe 41 and the extension outer pipe. The compressed air supply path 43 is connected to the compressed air introduction hole 34 through the communication hole 36.

  A discharge nozzle 51 is fixed to the lower end portion of the extension inner tube 41 by screwing. The discharge nozzle 51 has a discharge hole 51A having a circular cross section at the center, and the discharge hole 51A becomes thinner toward the tip. On the other hand, the cross section of the liquid discharge needle 50 is circular, and the tip portion 50A becomes thinner toward the tip, and the tip is pointed. The front end portion 50A has a circular cross section. When the needle 50 has advanced, a part of the tip 50A of the needle 50 protrudes outward (downward) from the discharge hole 51A of the nozzle 51, as shown in FIG. The liquid application material is stopped closely (closed state of liquid discharge operation).

  When the needle 50 is retracted, a gap is formed between the outer surface of the tip 50A of the needle 50 and the inner surface of the discharge hole 51A of the discharge nozzle 51, as shown in FIG. Is possible (discharge operation state). The size of the gap between the needle tip 50A and the discharge hole 51A of the nozzle is one of the parameters for controlling the amount of liquid to be discharged (hereinafter referred to as opening).

  An air cap 52 is fixed to the distal end portion (lower end portion) of the extension outer tube 42 by screwing. The air cap 52 covers the entire discharge nozzle 51 with a gap, has a converging inner wall 53 for converging compressed air ejected on the inner surface, and has an opening 52A that is considerably larger than the discharge hole 51A of the nozzle 51 at the tip. Yes. Further, a needle cover 54 is fixed to the air cap 52 by screwing. The needle cover 54 is open outward.

  A screw adapter 45 is housed and fixed (for example, bonded) in a compressed air supply path 43 between the extension inner tube 41 and the outer tube 42. As shown in FIGS. 8 and 9 in an enlarged manner, the screw adapter 45 has five screw grooves 46 formed on the peripheral surface, and these screw grooves 46 have an inclination angle of 15 to 25 degrees in the axial direction. doing. In the center, a hole 47 into which the inner tube 41 fits is formed. The screw adapter 45 forms a swirl flow in the atomized compressed air flowing in the supply passage 43 and promotes atomization of the liquid discharged from the gap between the discharge hole 51A of the nozzle 51 and the tip 51A of the needle 50.

  That is, as will be described later, the pressure-adjusted liquid coating material is supplied to the discharge nozzle 51 through the supply pipe 32, the introduction hole 31, and the center hole 33, through the gap between the needle 50 in the extension inner pipe 41. The On the other hand, the pressure-adjusted compressed atomized air is supplied to the compressed air supply path 43 between the extension inner pipe 41 and the outer pipe 42 through the supply pipe 35, the introduction hole 34, and the communication hole 36, and is supplied by the screw adapter 45. The swirl air is blown into an air cap 52 that covers the discharge nozzle 51. The atomized particles of the liquid discharged from the discharge nozzle 51 are converged to a certain width by the air swirling while converging along the inner wall 53 of the air cap 52, and form a jet flow spray pattern SP. The swirling compressed air prevents scattering of liquid atomized particles ejected from the nozzle 51.

  Next, the drive unit of the liquid discharge needle 50 will be described mainly with reference to FIGS.

  On the cylinder joint 61, a joint 62 and a cylinder 63 thereon are arranged in a straight line, and these are fixedly connected to each other by bolts (not shown). A linear actuator 70 is disposed on the cylinder 63 and is fixed to the cylinder 63 with bolts. The linear actuator 70 controls the opening degree of the discharge nozzle 51. The adjuster shaft 71 that protrudes downward and forward from the linear actuator 70 functions as a kind of stopper, and the position of its lower end surface determines the opening degree.

  A piston 64 is slidably accommodated in the cylinder 63, and a piston rod 65 is fixed to the center of the piston 64. The lower part of the piston rod 65 is fixedly connected (coupled) to the upper part of the needle 50 by a coupling 66. The upper part of the piston rod 65 penetrates the piston 64, and a piston cap 68 is provided at the upper end. The piston cap 68 is in a position where it can contact the lower end surface of the adjuster shaft 71. The coupling 66 can move up and down in a cylindrical hole formed in the cylinder joint 61. A coil spring 69 in the cylinder 63 always urges the piston 64 downward. Compressed air supplied from a compressed air supply pipe 67 provided in the joint 62 is sent through a supply hole in the joint 62 to the inside of the cylinder 63 (a space below the piston 64).

  The linear actuator includes, for example, a motor and a mechanism that converts rotation of the motor into axial movement (movement) of the adjuster shaft 71 (for example, a ball screw rotated by the motor and a nut fitted to the ball screw).

  In a state where compressed air is not supplied into the cylinder 63, the piston 64 is pushed downward by the force of the spring 69 as shown in FIG. 2, and the piston 64 is in contact with the joint 62. In this state, the needle 50 connected to the piston rod 65 fixed to the piston 64 by the coupling 66 is in a lowered position, and the tip 50A of the needle 50 closes the discharge nozzle 51 (the state shown in FIG. 6). ).

  When compressed air is supplied, as shown in FIG. 3, the piston 64 rises against the biasing force of the spring 69, thereby raising the piston rod 65, and the cap 68 is moved to the lower end surface of the adjuster shaft 71. Stop by hitting. Therefore, the rise of the needle 50 is determined by the position of the lower end surface of the adjuster shaft 71. The outer peripheral surface of the lower end portion 50A of the needle 50 is separated from the inner surface of the discharge hole 51A of the discharge nozzle 51, and the liquid is discharged (state shown in FIG. 7). The opening degree of the discharge nozzle 51 is determined by the position of the lower end surface of the adjuster shaft 71. That is, the opening degree of the discharge nozzle 51 is controlled by the linear actuator 70.

  10 to 12 show a coating preparation apparatus. Referring to FIG. 10, the coating preparation device 80 includes a cleaning station 81, a standby station 82, and a disposal blow station 83. In the cleaning station 81, a sponge is fitted in the container. When the application valve device 20 moves in the horizontal direction by the robot device 14, the needle cover 54 is rubbed against the sponge and cleaned (removal of application material). A solvent is placed in a container (solvent box) placed in the standby station 82. The coating valve device 20 descends at this station 82 while waiting, and a portion including the discharge nozzle 51 located under the coating valve device 20 is immersed in the solvent. This prevents the coating material from solidifying. When starting to move from the standby station 82, the coating valve device 20 is moved above the discard blowing station 83 by the robot device 14, and the coating liquid material is discharged from the valve 51 above the container of the discard blowing station 83. The discharged liquid material is stored in the drain 83A. Subsequent uniform application is expected by abandoning.

  The density, width, and direction of the spray pattern SP that is being blown away at the waste blowing station 83 are detected. That is, as shown in FIGS. 11 and 12, the concentration detector 84 includes a pair of a projector 84A and a light receiver 84B. The projector 84A projects the laser light L1, and the light receiver 84B receives the laser light L1 and outputs a signal indicating the intensity thereof. The optical path is determined so as to pass through the center of the spray pattern SP where the laser beam L1 of the density detector 84 is thrown away, and the projectors 84A and 84B are positioned, arranged, and fixed as such. Based on the output signal of the light receiver 84B, when the intensity of the output signal falls outside the allowable range (can be arbitrarily set), it is determined that an error has occurred.

  The width detector 85 includes two pairs of light emitters / receivers 86A, 86B and 87A, 87B, which are positioned, arranged and fixed as follows. That is, as shown in FIGS. 11 and 12, the two laser beams L2 and L3 emitted from the projectors 86A and 87A cross each other, and a gap between the two laser beams L2 and L3 is formed on the disposal station 83. Change gradually. These laser beams L2 and L3 are detected by light receivers 86B and 87B. The painting valve device 20 is moved by the robot device 14 while moving little by little in the direction connecting the light receivers 86B, 87B and the projectors 86A, 87A (the reverse direction of the X direction shown in FIG. 11 or the X direction). Abandoning is performed. The spray pattern at this time is shown by SP1, SP2, SP3, SP4, SP5, SP6, etc. in FIG. When a part of the spray pattern falls within the beam diameters of the laser beams L2 and L3, the received light intensity of these laser beams decreases, so that they move in the opposite direction of the X direction, and the received light intensity of the laser beams L2 and L3 increases. The X position lowered to a predetermined value represents the diameter of the spray pattern, that is, the coating width. When the changes in the received light intensity of the laser beams L2 and L3 are greatly different, the spray pattern is inclined (direction detection). In this case, it is generally handled as an error.

  As described above, the density, width, and direction of the spray pattern can be confirmed in advance before coating.

  FIG. 13 is a diagram mainly showing a coating system of a coating liquid material and air, and FIG. 14 is a diagram mainly showing an electrical control system. The overall control of the spray coating system 10 is controlled by a control device (including a computer system and a memory) 11 (FIG. 14). The control device 11 is accompanied by a display device 12 and an input device 13 (including a keyboard, a mouse, and a display device). The display device 12 also serves as a part of the input device 13. Control of liquid and air is mainly performed by the control panel 21 (FIGS. 13 and 14).

  First, with reference to FIG. 13, the liquid and air control system (regulation system) and the electrical control system will be described with occasional reference to FIG. The liquid coating material is stored in the tank 29 and supplied to the liquid coating material introduction hole 31 of the fluid body 30 through the pipes 92 and 93 at a given pressure. That is, the tank 29 is connected to the supply pipe 32 of the fluid body 30 by the pipes 92 and 93. A Coriolis flow meter 24 is provided between the pipes 92 and 93. The flow rate measured by the flow meter 24 is converted into digital data by the flow meter output AD converter 25 in the control panel 21 and input to the control device 11 (see FIG. 14). A pressure command signal representing a given pressure output from the control device 11 is converted into an air pressure signal by an electropneumatic converter 26 in the control panel 21 to control an air operated hydraulic pressure regulator (regulator) 22. The regulator 22 adjusts the pressure of the liquid coating material in the tank 29 through the pipe 91 to a given pressure. These tank 29, pipes 91, 92, 93, liquid pressure regulator 22, aeroelectric converter 26, etc. constitute a liquid material supply device.

  The compressor 28 generates supply air pressure to be supplied to the electropneumatic converters 26 and 27, the air operated hydraulic pressure regulator 22, the atomizing air pressure regulator 23, the valve 72 (pipe 96), and the like. The atomizing air pressure command signal is output from the control device 11, converted into an air pressure signal by the electropneumatic converter 27, and applied to the atomizing air pressure regulator 27. The compressed air supplied through the pipe 94 is adjusted to have a given air pressure by the regulator 23 and supplied through the pipe 95 to the supply pipe 35 that communicates with the compressed atomizing air introduction hole 34 of the fluid body 30. The aeroelectric converter 27, the air pressure regulator 23, the pipes 94 and 95, etc. constitute an air supply device.

  The supply pipe 96 is connected to the compressed air supply pipe 67. The supply pipe 96 is provided with a valve 72. When the valve 72 is opened, compressed air is supplied to the cylinder 63 and pushes up the piston 64 against the urging force of the spring 69. When the valve 72 is closed, the supply pipes 67 and 96 are released to the atmosphere, the piston 64 is moved by the force of the spring 69, and the discharge nozzle 51 is closed (state shown in FIGS. 2 and 6). The opening and closing of the valve 72 is driven by a driver 73 under the control of the control device 11.

  The motor of the coating width linear actuator 70 that determines the opening degree of the discharge nozzle 51 is driven by the driver 17 under the control of the control device 11.

  Detection signals of the concentration sensor 84 and the width sensor 85 in the coating preparation device 80 are given to the control device 11 via the P / C interface unit 18.

  The robot device 14 is moved by X, Y and Z axis stepping motors (three-axis drive). These stepping motors 15 are driven by drivers (there are three corresponding to each motor) 16 under the control of the control device 11.

  The memory (storage device) of the control device 11 stores an application condition table as shown in FIGS. This application condition table is used to obtain a desired good application width under predetermined standard conditions (for example, an application distance (distance between the nozzle tip and the object) of 10 mm, application speed of 100 m / sec). The above conditions were obtained by repeating the experiment while changing the following parameters.

  The parameters of the spray application device are the pressure value (A) (unit: megapascal Mpas) of the atomizing air supplied to the compressed atomizing air introduction hole 34 in the application valve device 20, and the opening degree (M) of the discharge nozzle (linear It is expressed by the number of revolutions of the motor of the actuator 70. The unit is the number of revolutions) (hereinafter referred to as micro opening) and the liquid pressure (L) of the liquid coating material supplied to the coating material introduction hole 31 (the unit is Mpas) It is three. Since the viscosity (V) of the liquid coating material is an important factor, this viscosity (V) is also used to determine the value of each parameter. The unit of viscosity (V) is centipoise (CPS).

  The desired application width (W) (unit is millimeter mm) and the viscosity (V) of the liquid application material are determined. The values of the three parameters described above depend on one of these application widths and viscosities, or a combination thereof. The atomizing air pressure value (A) depends on the target application width and viscosity. As shown in the setting condition table for atomizing air pressure value in Fig. 15 (A), depending on whether the target application width is 2.5 mm or more or less than 2.5 mm, the atomizing air pressure depends on whether the viscosity is less than 50 CPS or 50 CPS or more. The value is determined. When the coating width is less than 2.5 mm and the viscosity is less than 50 CPS, the air pressure value is a linear function of the viscosity.

  The micro opening degree depends on the target application width. As shown in the setting condition table for the micro-opening value in FIG. 15 (B), the micro-opening value varies depending on whether the target application width is less than 4 mm, 4 mm or more and less than 6 mm, or 6 mm or more. In any case, the micro opening is a linear function of the target application width, and the value of the coefficient varies depending on the range of the target application width.

  The liquid pressure of the coating material depends on the target coating width and viscosity. That is, as shown in the hydraulic pressure setting condition table in Fig. 15 (C), when the viscosity is less than 50 CPS, the fluid pressure takes a constant value (0.24 MPa), and when the viscosity is 50 CPS or more, the fluid pressure Takes different values depending on whether the coating width is less than 2 mm or more than 2 mm. When the coating width is less than 2 mm, the fluid pressure is a function of the target coating width, and when the coating width is 2 mm or more, the fluid pressure is a function of the micro opening.

  The user inputs the target application width and viscosity using the input device 13 of the control device 11. These input values are displayed on the display device 12 as shown in FIG. 16 (A), and the user can confirm them.

  The control device 11 takes in the values of the input target application width and viscosity, and refers to the application condition table shown in FIGS. 15 (A), 15 (B), and 15 (C), and the atomizing air pressure, the micro opening degree, and the liquid level. Determine the pressure. Further, the control device 11 controls the atomizing air pressure regulator 23 for the atomizing air pressure, controls the actuator 70 for the micro opening degree, and controls the liquid pressure for the liquid pressure so that the determined values are as described above. The pressure regulator 22 is controlled.

  When the robot device 14 is started by the input device 13 of the control device 11, the robot device 14 scans the object in accordance with a program incorporated in advance and performs linear coating with a predetermined width. Application may be started by opening the valve 72, supplying compressed air to the cylinder 63, and pushing up the piston 64. Further, at the start of coating, the coating preparation device 80 cleans the needle cover 54 at the cleaning station 81, discards at the discarding blower station 83, confirms the concentration by the concentration sensor 84, and detects the width by the width sensor 85. Confirmation is performed as necessary.

9 Object
10 Spray application system
10A Work port
11 Control unit
12 Display device (input means)
13 Input device (input means)
14 Robotic equipment
15 Motor (Robot motor)
16 Screwdriver
17 Actuator driver
18 I / F
19 Housing
19A machine stand
20 Dispensing valve device
21 Control panel
22 Fluid pressure regulator (Liquid material supply device)
23 Air pressure regulator (air supply device)
24 Flow meter (liquid)
25 A / D
26, 27 Electropneumatic conversion
28 Compressor
29 tanks
30 Fluid body
30A boss
31 Coating material introduction hole
32 Coating material supply pipe
33 Center hole
34 Compressed atomization air (air) introduction hole
35 Compressed atomizing air supply pipe
36 Communication hole
37 Bearing
40 Extension section
41 Extension inner pipe
42 Extension outer tube
43 Compressed air supply path
45 Screw adapter
46 Screw groove
47 holes
50 Liquid discharge needle
50A Needle tip
51 Discharge nozzle
51A Discharge hole
52 Air cap
52A opening
53 Converging inner wall
54 Needle cover
60 Drive unit
61 Cylinder joint
62 Joint
63 cylinders
64 piston
65 piston rod
66 coupling
67 Compressed air supply pipe
68 Piston cap
69 Coil spring
70 Linear actuator
71 Adjuster shaft
72 valves
73 Driver
80 Application preparation equipment
81 cleaning station
82 Standby station
83 Abandoned station
84 Concentration sensor (concentration detector)
85 Width sensor (width detection device)
84A, 86A, 87A Floodlight
84B, 86B, 87B
91-93 Liquid piping
94, 95 Air piping
96 Air piping (actuator)

Claims (7)

A liquid discharge nozzle having a discharge hole to which a liquid coating material is supplied;
A needle that is inserted into the discharge hole of the liquid discharge nozzle so as to freely advance and retract, and adjusts the opening of the discharge hole;
An actuator for driving the needle forward and backward,
A coating material supply device that includes a liquid pressure regulator, pressurizes the liquid coating material, and feeds the liquid coating material to the discharge hole;
An air supply device that includes an air pressure regulator and supplies atomized air to converge the coating material ejected from the nozzle hole;
Input means for inputting at least the desired application width and viscosity of the liquid application material; and determining the liquid pressure and air pressure according to at least the application width and viscosity input from the input means, A control device for controlling the actuator to control the air pressure regulator and adjust the opening of the discharge hole according to at least the input application width;
A spray coating apparatus comprising: An air pressure value setting condition table that stores air pressure values corresponding to the application width range and viscosity range, a hydraulic pressure value setting condition table that stores hydraulic pressure corresponding to the application width range and viscosity range, and A storage device for storing an opening setting condition table for storing the discharge hole opening corresponding to the coating width range;
The control device sets an air pressure value, a hydraulic pressure value, and a discharge hole opening with reference to each setting condition table.
The spray coating apparatus according to claim 1.   The spray coating apparatus according to claim 1, further comprising a coating preparation apparatus including a waste blowing station.   The spray coating apparatus according to claim 3, wherein the coating preparation apparatus includes a density detection device that detects a density of a spray pattern to be blown away.   The spray coating apparatus according to claim 3 or 4, wherein the coating preparation apparatus includes a width detecting device that detects a width of a spray pattern to be blown away. A liquid discharge nozzle having a discharge hole to which a liquid coating material is supplied;
A needle that is inserted into the discharge hole of the liquid discharge nozzle so as to freely advance and retract, and adjusts the opening of the discharge hole;
An actuator for driving the needle forward and backward,
Including a liquid pressure regulator, a coating material supply device that pressurizes and applies liquid coating material to the discharge hole, and an air pressure regulator, and supplies atomized air that converges the coating material ejected from the nozzle hole In a spray coating device equipped with an air supply device,
Provide input means to input at least the desired coating width and the viscosity of the liquid coating material,
According to at least the coating width and viscosity input from the input means, the liquid pressure and the air pressure are respectively determined by controlling the liquid pressure regulator and the air pressure regulator, and according to at least the input coating width. Control the actuator to adjust the opening of the discharge hole,
Spray application method. Input means for inputting at least the desired coating width and the viscosity of the liquid coating material;
An air pressure value setting condition table that stores air pressure values corresponding to the application width range and viscosity range, a hydraulic pressure value setting condition table that stores hydraulic pressure corresponding to the application width range and viscosity range, and A storage device for storing an opening setting condition table for storing the discharge hole opening corresponding to the range of the application width, and referring to each setting condition table according to at least the application width and the viscosity input from the input means A control device for determining the fluid pressure, air pressure and discharge hole opening,
A spray coating apparatus comprising:

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