Abstract: An electrostatic coating apparatus includes a coating gun that sprays a coating material toward a coated matter, a high-voltage application apparatus that applies a high voltage to the coating gun, a bell-side current calculation unit that calculates a bell-side current to flow from the coating gun to the coated matter, an earth-side current measurement unit that measures an earth-side current to flow from the coated matter to the earth, and an earth check unit that detects an abnormal earth state of the coated matter, depending on a magnitude relation between the bell-side current calculated at the time of electrostatic coating and the bell-side current when the earth is properly connected, and a magnitude relation between the earth-side current measured at the time of the electrostatic coating and the earth-side current when the earth is properly connected.

Abstract: An electrostatic coating apparatus includes: a spray gun configured to spray a coating material onto a coating object; a voltage application device configured to apply a high voltage to the spray gun; and a current measurement device configured to measure electric current flowing through the spray gun. When the spray gun, which is in a state of not spraying the coating material onto the coating object and is under application of the high voltage from the voltage application device, is located at a distance from the coating object, the electric current flowing through the spray gun is measured by the current measurement device. A grounded state of the coating object is checked, based on the measured electric current. This shortens the time required for checking the grounded state, while allowing for downsizing and simplified configuration of production equipment and reduction of equipment cost.

Abstract: An electrostatic coating apparatus includes a coating gun that sprays a coating material toward a coated matter, a high-voltage application apparatus that applies a high voltage to the coating gun, a bell-side current calculation unit that calculates a bell-side current to flow from the coating gun to the coated matter, an earth-side current measurement unit that measures an earth-side current to flow from the coated matter to the earth, and an earth check unit that detects an abnormal earth state of the coated matter, depending on a magnitude relation between the bell-side current calculated at the time of electrostatic coating and the bell-side current when the earth is properly connected, and a magnitude relation between the earth-side current measured at the time of the electrostatic coating and the earth-side current when the earth is properly connected.

Abstract: An electrostatic coating apparatus includes: a spray gun configured to spray a coating material onto a coating object; a voltage application device configured to apply a high voltage to the spray gun; and a current measurement device configured to measure electric current flowing through the spray gun. When the spray gun, which is in a state of not spraying the coating material onto the coating object and is under application of the high voltage from the voltage application device, is located at a distance from the coating object, the electric current flowing through the spray gun is measured by the current measurement device. A grounded state of the coating object is checked, based on the measured electric current. This shortens the time required for checking the grounded state, while allowing for downsizing and simplified configuration of production equipment and reduction of equipment cost.

Abstract: An electrostatic painting apparatus (1) includes: a paint gun (4) that has a bell cup (4a) serving as an atomization portion that atomizes a paint, and an air nozzle (7) serving as an air discharge portion that discharges shaping air for controlling a diffusion pattern of the atomized paint; a high-voltage generator (5) that applies a high voltage to the paint gun (4); and a controller (6) that controls the high voltage to be applied from the high-voltage generator (5), wherein the high-voltage generator (5) generates a high positive voltage.

Abstract: A coating gun includes: a high-voltage generating device that is used to generate high voltage; an air motor that is a motor portion to which the high voltage is applied; a bell cup that is supported on a rotary shaft of the air motor and to which the high voltage is applied; a CCV unit that selectively supplies a plurality of types of coatings to the bell cup; a gun body that is a casing and that contains the high-voltage generating device, the air motor and the CCV unit; and a coupling portion that is used to couple the gun body to a robot arm and that is grounded. The air motor and the CCV unit are electrically connected to each other via a first resistor, and the coupling portion and the CCV unit are electrically connected to each other via a second resistor.

Abstract: A method of detecting a wire break in a high voltage generating device that is configured to detect a wire breakage in a low-voltage cable is disclosed. The method of a wire break includes: detecting whether a wire break has occurred in each of the lines in accordance with a combination pattern of whether the time differential value of an IM signal value of a CW circuit obtained when an operating voltage is boosted is positive, negative, or 0, and whether the time differential value of a VM signal value obtained after the operating voltage is boosted by the CW circuit is positive, negative, or 0; and identifying which of the lines is broken.

Abstract: A coating gun includes: a high-voltage generating device that is used to generate high voltage; an air motor that is a motor portion to which the high voltage is applied; a bell cup that is supported on a rotary shaft of the air motor and to which the high voltage is applied; a CCV unit that selectively supplies a plurality of types of coatings to the bell cup; a gun body that is a casing and that contains the high-voltage generating device, the air motor and the CCV unit; and a coupling portion that is used to couple the gun body to a robot arm and that is grounded. The air motor and the CCV unit are electrically connected to each other via a first resistor, and the coupling portion and the CCV unit are electrically connected to each other via a second resistor.

Abstract: An electrostatic coating system includes a coating robot (1) and an electrostatic atomizer (6) attached to a polyarticular wrist portion (5) of the robot (1). The atomizer (6) includes an end plate (45), metallic connector (50) fixed to the end plate (45) in electric conduction, high voltage generator (20) and bell head (18). Electric power is supplied to the high voltage generator (20) through the connector (50). Wires (53) are connected to the connector (50) to take out high voltage leak caused by contamination like a deposition of paint on outer surfaces of the atomizer (6) through the wires 53 to control the high voltage generator (20) to lower the value of the high voltage applied to the bell head (18) of high voltage leak detected through the wires (53) is larger than a predetermined threshold value.

Abstract: An electrostatic painting apparatus (1) includes: a paint gun (4) that has a bell cup (4a) serving as an atomization portion that atomizes a paint, and an air nozzle (7) serving as an air discharge portion that discharges shaping air for controlling a diffusion pattern of the atomized paint; a high-voltage generator (5) that applies a high voltage to the paint gun (4); and a controller (6) that controls the high voltage to be applied from the high-voltage generator (5), wherein the high-voltage generator (5) generates a high positive voltage.

Abstract: Intended is to enable an electrostatic coating apparatus including a plurality of needle electrodes formed in an annular shape and having a blot preventing function, to prevent the generation of a spark discharge reliably, in case an arbitrary needle electrode approaches an earth element, and to keep the intensity of a generated electrostatic field properly. A coating gun comprises a blot preventing device including a ring-shaped electrode unit having a plurality of needle electrodes protruding radially at a substantially equal spacing radially outward from an annular base member, and a high-voltage generator for applying a high voltage to the electrode unit. The needle electrodes are connected in parallel with the high-voltage generator through individual resistors, block-by-block resistors and built-in resistors.

Abstract: A method of detecting a wire break in a high voltage generating device that is configured to detect a wire breakage in a low-voltage cable is disclosed. The method of a wire break includes: detecting whether a wire break has occurred in each of the lines in accordance with a combination pattern of whether the time differential value of an IM signal value of a CW circuit obtained when an operating voltage is boosted is positive, negative, or 0, and whether the time differential value of a VM signal value obtained after the operating voltage is boosted by the CW circuit is positive, negative, or 0; and identifying which of the lines is broken.

Abstract: An electrostatic coating system (1) comprising a coating gun (2) for spraying a coating material toward an article (9) to be coated, and a robot arm (3) for moving the coating gun (2) with respect to the article (9) to be coated wherein a voltage is applied to the coating gun (2). A needle-like electrode (11) which is an electrostatic electrode having a pointed end applied with a voltage having the same polarity as that of the voltage applied to the coating gun (2), is attached to the coating gun (2) or the robot arm (3).

Abstract: Intended is to enable an electrostatic coating apparatus including a plurality of needle electrodes formed in an annular shape and having a blot preventing function, to prevent the generation of a spark discharge reliably, in case an arbitrary needle electrode approaches an earth element, and to keep the intensity of a generated electrostatic field properly. A coating gun comprises a blot preventing device including a ring-shaped electrode unit having a plurality of needle electrodes protruding radially at a substantially equal spacing radially outward from an annular base member, and a high-voltage generator for applying a high voltage to the electrode unit. The needle electrodes are connected in parallel with the high-voltage generator through individual resistors, block-by-block resistors and built-in resistors.

Abstract: Total supplied current (I2) and high voltage (Vm) supplied to a rotary atomizer head (5) are detected by a total current sensor (115) and a high voltage sensor (116). Total leak current (I2) in paint paths, thinner paths and air paths inside an electrostatic atomizer (2) is detected via a metal back plate (40) of the electrostatic atomizer (2). When the total leak current value (I2) exceeds a threshold value (Ia), the level Vm of the high voltage applied to the rotary atomizer head (5) is lowered stepwise.

Abstract: An electrostatic coating system includes a coating robot (1) and an electrostatic atomizer (6) attached to a polyarticular wrist portion (5) of the robot (1). The atomizer (6) includes an end plate (45), metallic connector (50) fixed to the end plate (45) in electric conduction, high voltage generator (20) and bell head (18). Electric power is supplied to the high voltage generator (20) through the connector (50). Wires (53) are connected to the connector (50) to take out high voltage leak caused by contamination like a deposition of paint on outer surfaces of the atomizer (6) through the wires 53 to control the high voltage generator (20) to lower the value of the high voltage applied to the bell head (18) of high voltage leak detected through the wires (53) is larger than a predetermined threshold value.

Abstract: An electrostatic coating system (1) comprising a coating gun (2) for spraying a coating material toward an article (9) to be coated, and a robot arm (3) for moving the coating gun (2) with respect to the article (9) to be coated wherein a voltage is applied to the coating gun (2). A needle-like electrode (11) which is an electrostatic electrode having a pointed end applied with a voltage having the same polarity as that of the voltage applied to the coating gun (2), is attached to the coating gun (2) or the robot arm (3).

Abstract: A rotary atomizer (1) has a rotary atomizing head (4) driven by an air motor (2) at a rotational speed of 4,000˜5,000 rpm, for example. A coating material is supplied to a central portion of the rotary atomizing head (4) through a paint supply pipe (5). The atomizer (1) further includes a supersonic horn (6) having a vibration plane (6a) located adjacent to the outer circumferential perimeter of the rotary atomizing head (4). The vibration plane (6a) is an inclined plane gradually increasing its diameter forward. The coating material immediately after spattered from the outer circumferential perimeter of the rotary atomizing head (4) is exposed to supersonic vibration from the vibration plane (6a), and it is atomized by the supersonic vibration to particles of a uniform grain size. At the same time, the atomized coating material is driven forward.

Abstract: A coating machine 3 serving as a rotary atomizer comprises a hollow unrotary paint nozzle shaft 5 provided in the center of a motor shaft 10 serving as its rotary shaft. The paint nozzle shaft 5 is provided at a tip thereof with a gun-spray paint nozzle 5g and a gun-spray air nozzle 5f on the outside of the gun-spray paint nozzle 5g in the diametrical direction, and a needle shaft 21 is disposed in a paint passage 5b in the paint nozzle shaft 5 so as to serve as a valve mechanism for selectively supplying paint to either a bell cup 4 or the gun-spray paint nozzle 5g.

Abstract: To prevent contamination by abnormal discharge in direct-charging electrostatic atomizers, a new electrostatic atomizer uses a main external electrode (13) and an auxiliary external electrode (17) located radially outward of an atomizer main body (4). A high-voltage supply line (15) for supplying a high voltage to the main external electrode (13) is connected to a head member (5) of the atomizer main body (4) by an additional conductor line (18), in which an auxiliary external electrode (17) is connected between a first and a second resistors (19, 20). When water paint is supplied to the rotary atomizing head (2) through a paint supply passage (10), the rotary atomizing head (2) is connected to the ground potential by the water paint itself, and automatically configured to operate as an indirect-charging electrostatic atomizer.