JP4779422B2 - Painting equipment - Google Patents

Description

  The present invention relates to a technique for uniformly applying a paint to the inner surface of a hollow sphere.

Conventionally, it is known to apply a coating containing phosphor or the like to the inner surface of a hollow sphere such as an outer bulb of a lamp, thereby forming a coating containing the phosphor or the like on the inner surface of the hollow sphere. . As a coating device for forming a film in the hollow sphere, the liquid paint is allowed to flow into the hollow sphere and flow over the entire inner surface. A method of discharging the paint is proposed (see Patent Document 1). However, in the above-described coating apparatus, there is a problem that a step of discharging the paint flowing into the hollow sphere is required and it is difficult to uniformly apply the paint to the entire inner surface.
JP 2004-063284 A

  The present invention has been invented in view of the above-described problems, and provides a coating apparatus capable of uniformly applying a paint to the inner surface of a hollow spherical body such as an outer tube valve with fewer steps. This is a problem.

In order to solve the above problems, the present invention provides a coating apparatus for applying a paint to the inner surface of a hollow sphere having an opening, and a rod-shaped support member whose tip is inserted into the hollow sphere through the opening; A paint spray nozzle supported by the tip of the support member, a drive mechanism for rotating the nozzle relative to the inner surface of the hollow spherical body, an advance / retreat mechanism for moving the support member back and forth in the direction of its central axis, and A driving mechanism and a controller that interlocks the advance / retreat mechanism . The drive mechanism includes a turning mechanism for turning the nozzle portion with respect to the support member about a rotation axis extending in a direction orthogonal to the center axis direction of the support member, and a support member and a hollow spherical body. A rotation mechanism that relatively rotates about a central axis, and the rotation mechanism swivels so that the spray direction of the nozzle portion is directed to a part of the inner surface of the hollow spherical body that is long from the central axis. The more the nozzle part is swung by the mechanism , the smaller the rotation speed is controlled, and the turning mechanism and the advance / retreat mechanism are the distance between the nozzle part and the inner surface of the hollow sphere in the spray direction from the nozzle part. There that are controlled to be kept constant. In the coating apparatus having the above-described configuration, the coating material can be applied to the entire inner surface of the hollow sphere by spraying the coating while rotating the nozzle portion by the drive mechanism. On the other hand, it is possible to apply the paint uniformly with fewer steps. In addition, the drive mechanism for rotating the nozzle portion with respect to the hollow spherical body can be realized with a simple and effective structure in which a turning mechanism and a rotation mechanism are combined.

  Further, in the coating apparatus, the advancing / retreating mechanism for advancing and retracting the support member in the central axis direction and the distance between the nozzle part and the inner surface of the hollow sphere in the spraying direction from the nozzle part are maintained constant. It is preferable to comprise a drive mechanism and a controller that links the advance / retreat mechanism. By doing in this way, even if the hollow spherical body has various shapes having an elliptical cross section, it is possible to uniformly apply the coating material to the entire inner surface corresponding to this.

  The present invention has an effect that a paint can be uniformly applied with few steps to the inner surface of a hollow spherical body such as an outer tube valve.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. FIG. 1 shows an example of a coating apparatus according to an embodiment of the present invention. The coating apparatus of this example is an inner surface 1a of the hollow spherical body 1 of an outer tube valve 3 formed by extending a cylindrical cylinder 2 outward from the opening edge of the hollow spherical body 1 having an opening. A rod-like support member 5 inserted into the hollow sphere 1 from the outside through the inside of the cylindrical body 2 and the opening of the hollow sphere 1, and a support member 5 and a nozzle portion 6 connected to the tip portion in the insertion direction (upward direction in the figure).

  Connected to the nozzle section 6 are a tube 8 for connecting the coating liquid tank 7 as a paint supply section and the nozzle section 6 and a tube 9 for supplying spray air to the nozzle section 6. , 9 and the paint 4 and the spray air fed through the discharge pump unit 10 are mixed in the nozzle unit 6 and then sprayed from the spray port 6a at the tip of the nozzle unit 6 with a predetermined range of spread. . Reference numeral 40 in the figure is a rotary joint installed on the support member 5 and is provided so as to be interposed in the middle of the flow path of both tubes 8 and 9.

  The nozzle portion 6 is pivotally connected to the distal end portion of the support member 5 around a rotation axis B extending in a direction orthogonal to the central axis A direction (vertical direction in the drawing) of the support member 5. A first turning pulley 11 is fixed to the nozzle portion 6 so that the rotation axis B passes through the center thereof, and a second turning pulley 12 is rotatably installed on the base end side of the support member 5. The turning motor 14 that rotates the second turning pulley 12 while the turning belt 13 is wound around is disposed in the vicinity of the support member 5. In this example, a turning mechanism 15 for turning the nozzle portion 6 is configured by the above-described configurations. By this turning mechanism 15, the nozzle portion 6 rotates the direction of the spray port 6a about the rotation axis B. Thus, the spraying direction of the paint 4 from the spraying port 6a can be freely changed.

  A spline shaft portion 5a having a groove 16 extending in the direction of the central axis A on the outer peripheral surface is formed at a position on the base end side of the support member 5 where the second turning pulley 12 is provided. The spline shaft portion 5a is fitted with a first rotation pulley 17 having a concave and convex shape (not shown) that slidably engages with the groove 16 in the direction of the central axis A on the inner peripheral surface. A rotation belt 20 is wound around the second rotation pulley 19 that is rotationally driven by the motor 18 and the first rotation pulley 17. With each of the above-described configurations, a rotation mechanism 21 that rotates the support member 5 and the nozzle portion 6 about the center axis A of the support member 5 is configured. By this rotation mechanism 21, the nozzle portion 6 rotates about the center axis A. However, the spraying direction can be freely changed.

  Further, a feed screw shaft portion 5b in which a male screw 22 is cut on the outer peripheral surface is formed at a location closer to the base end side than a location where the spline shaft portion 5a is formed. The feed screw shaft portion 5b is fitted with a first advancing / retreating pulley 23 in which a female screw (not shown) screwed to the male screw 22 is cut on the inner peripheral surface. An advancing / retreating belt 26 is wound around the second advancing / retreating pulley 25 and the first advancing / retreating pulley 23. Since the first advancing / retreating pulley 23 is installed so as to be immovable in the direction of the central axis A, the advancing / retreating motor 24 rotates the first advancing / retreating pulley 23 via the second advancing / retreating pulley 25 and the advancing / retreating belt 26. Then, the screw shaft portion 5b, that is, the entire support shaft portion 5 moves forward and backward in the direction of the central axis A according to the rotation direction and the rotation amount.

  With each of the above-described configurations, an advance / retreat mechanism 27 for advancing / retreating the support member 5 in the direction of the central axis A is configured, and the position of the nozzle unit 6 is moved in the direction of the central axis A by the advance / retreat mechanism 27. At this time, the spline shaft portion 5a of the rotation mechanism 21 and the first rotation pulley 18 change their relative positions in the direction of the central axis A, but the spline shaft portion 5a and the first rotation pulley 18 change regardless of the change of the relative position. Since the rotation pulley 18 is engaged with the rotation pulley 18 so that power can be transmitted, the rotation driving force of the rotation motor 18 is transmitted to the support member 5 without any problem.

  Reference numeral 28 in the drawing is a holder for holding the outer tube valve 3, and is fixed to a portion on the outer surface of the hollow spherical body 1 on the side opposite to the opening. The holder 28 is rotationally driven around the central axis A of the support member 5 by the rotation motor 29, and the hollow spherical body 1 itself is rotationally driven around the central axis A via the holder 28. Is possible.

  In this example, the spherical body-side rotation mechanism 30 configured to rotate the hollow spherical body 1 having the above-described configurations, and the above-described rotation mechanism 21 that rotationally drives the support member 5 in the opposite direction to the spherical body-side rotation mechanism 30. Is a rotation mechanism 31 that relatively rotates the support member 5 and the hollow sphere 1 around the central axis A of the support member 5, but one of the spherical-body-side rotation mechanism 30 and the rotation mechanism 21. Only the rotation mechanism 31 may be configured.

  In this example, as described above, the rotation mechanism 31 that relatively rotates the support member 5 and the hollow sphere 1 around the center axis A, and the nozzle about the rotation axis B that is orthogonal to the center axis A. The turning mechanism 15 that turns the portion 6 with respect to the support member 5 constitutes a drive mechanism 32 that turns the nozzle portion 6 in all directions with respect to the inner surface 1a of the hollow sphere 1.

  Each of the motors 14, 18, 24, and 29 described above is PLC-controlled by the control unit 33, and the advance / retreat mechanism 27 driven by the advance / retreat motor 24 is turned according to various shapes of the hollow spherical body 1. The distance between the nozzle portion 6 and the inner surface 1a of the hollow sphere 1 is set to be constant in the spraying direction from the nozzle portion 6 in conjunction with the turning mechanism 15 driven by the nozzle 14. That is, for example, when the hollow sphere 1 has an elliptical cross section in which the vertical direction in the drawing is the major axis direction, the spray port 6a is provided when the upper portion of the inner surface 1a of the hollow sphere 1 is painted. The nozzle portion 6 is turned so as to face upward, and the nozzle portion 6 is moved upward integrally with the support member 5. At this upper position, the nozzle portion 6 and the hollow sphere 1 are relatively centered on the center axis A. Rotate. When painting the lower part of the inner surface 1a, the nozzle part 6 is turned so that the spray port 6a faces downward, and the nozzle part 6 is moved downward, and the nozzle part 6 turns here. Control and advance / retreat control may be appropriately set according to the shape of the hollow sphere 1.

Further, the turning mechanism 15 driven by the turning motor 14 and the rotating mechanism 31 driven by the rotation motor 18 and the rotation motor 29 have a coating speed of the nozzle portion 6 on the inner surface 1a of the hollow spherical body 1. Regardless of the direction, it is linked so that it is always constant. That is, when coating a portion having a long distance from the central axis A, such as the upper portion or the lower portion of the inner surface 1a of the hollow sphere 1, the nozzle portion 6 is set so that the spray port 6a faces upward or downward. While rotating, the nozzle portion 6 and the hollow sphere 1 are driven to rotate about the central axis A at a relatively small rotational speed, and conversely, the central axis is like the central portion in the vertical direction of the inner surface 1a of the hollow sphere 1. When painting a portion with a short distance from A, the nozzle portion 6 is turned so that the spray port 6a faces sideways, and the nozzle portion 6 and the hollow sphere 1 are centered at a relatively high rotational speed. It is driven to rotate about the axis A. Thereby, the application | coating speed with respect to the inner surface 1a of the hollow sphere 1 can be kept constant, and rotation control and rotation control here are set suitably according to the shape of the hollow sphere 1.

  Specifically, the peripheral speed around the central axis A of the portion where the paint 4 on the inner surface 1a of the hollow sphere 1 is sprayed is 90 mm / sec, and the spray on the inner surface 1a of the hollow sphere 1 is performed. The position is automatically adjusted so that the moving speed at which the position moves in the direction of the central axis A by turning the nozzle portion 6 is 5 mm / sec. Here, it is desirable that the moving speed is 1/14 or less of the peripheral speed.

  That is, by the PLC control in the control unit 33, the distance from the nozzle unit 6 and the coating speed are kept constant at any location on the inner surface 1a of the hollow sphere 1, and the shape of the hollow sphere 1 Regardless, the paint 4 can be uniformly applied to the entire inner surface 1a.

  In the coating apparatus of the present example having the above-described configuration, the outer tube valve 3 is fixed by the holding tool 28 with the opening of the hollow spherical body 1 facing downward, and is hollowed from the opening through the cylindrical body 2. The support member 5 is inserted into the spherical body 1, and the nozzle portion 6 connected to the distal end portion of the support member 5 is positioned at the central portion of the hollow spherical body 1. Here, the rotation mechanism 31 including the rotation mechanism 21 and the spherical body side rotation mechanism 30 causes the nozzle portion 6 and the support member 5 and the inner surface 1a of the hollow spherical body 1 to be rotationally driven about the center axis A and swivel. The paint 4 can be applied to the entire inner surface 1 a of the hollow sphere 1 by controlling the nozzle portion 6 to rotate about the rotation axis B with respect to the support member 5 by the mechanism 15.

  In addition, at this time, the support member 5 and the nozzle portion 6 are centered by the advancing / retreating mechanism 27 so that the distance between the nozzle portion 6 and the inner surface 1a of the hollow spherical body 1 in the spraying direction is constant by PLC control of the control portion 33. Since the turning mechanism 15 and the rotating mechanism 31 are driven so that the coating 4 is applied to the inner surface 1a of the hollow sphere 1 at a constant speed while being advanced and retracted in the A direction, the shape of the hollow sphere 1 is increased. Regardless, the coating 4 is uniformly applied to the entire inner surface 1a.

  Next, another example of the coating apparatus according to the embodiment of the present invention will be described with reference to FIG. Since the basic configuration of this example is the same as the configuration of the above-described example, the same reference numerals are given to the configuration that matches the example, and detailed description is omitted, and the characteristic configuration that is different from the example Only is described in detail below.

  In the coating apparatus of this example, a support piece 34 curved in an arc shape along the inner surface 1a of the hollow sphere 1 is fixed to the tip of the support member 5, and a plurality of (see FIG. In the illustrated example, the three nozzle portions 6 are arranged so that the spray ranges are different. The arrangement of each nozzle portion 6 is set so that the distance between the spray port 6a and the inner surface 1a of the hollow sphere 1 is the same, and the spray ranges on the inner surface 1a partially overlap.

  That is, in the coating apparatus of this example, instead of including the turning mechanism 15 as in the example, a plurality of nozzle parts 6 are arranged radially at the tip of the support member 5, so that the same rotation mechanism as in the example While rotating the support member 5 and each nozzle part 6 around the central axis A with respect to the hollow spherical body 1 by a rotation mechanism 31 comprising 21 (this constitutes the drive mechanism 32 in this example) By spraying the paint 4 from the nozzle portion 6, the paint 4 can be uniformly applied to the entire inner surface 1 a of the hollow sphere 1.

  Next, still another coating apparatus in the embodiment of the present invention will be described with reference to FIG. Since the basic configuration of this example is the same as the configuration of the above-described example, the same reference numerals are given to the configuration that matches the example, and detailed description is omitted, and the characteristic configuration that is different from the example Only is described in detail below.

  In the coating apparatus of this example, a slit nozzle portion 35 for spraying paint is connected to the tip of the support member 5 inserted into the hollow sphere 1, and the slit nozzle portion 35 is formed of the hollow sphere 1. It is provided so as to be located in the central part. The slit nozzle portion 35 has a side surface 35a curved in an arc shape along the inner surface 1a of the hollow spherical body 1, and a plurality of spray ports (not shown) are formed in the side surface 35a. The distances from the spray ports to the inner surface 1a are the same, and the spray ranges on the inner surface 1a are partially overlapped. Moreover, in this example, it is set as the structure sent from the tube 37 to the slit nozzle part 35 in the state with which the coating material 4 sent from the coating liquid refinement | miniaturization apparatus 36 which is a coating material supply part, and spraying air were mixed. . FIG. 3A shows a case where one semicircular slit nozzle portion 35 having an arcuate side surface 35a is provided, and FIG. 3B shows the slit nozzle portion 35 facing in opposite directions. However, it may be provided with three or more slit nozzle portions 35.

  That is, in the coating apparatus of this example, instead of including the nozzle unit 6 and the turning mechanism 15 as in the example, the slit nozzle unit 35 provided with a number of spray ports so as to spray the paint 4 radially is provided. Since it is connected to the tip of the support member 5, the support member 5 and the slit nozzle portion are constituted by a rotation mechanism 31 (which in this example constitutes the drive mechanism 32) composed of the same rotation mechanism 21 as in the example. The paint 4 can be uniformly applied to the entire inner surface 1a of the hollow sphere 1 by spraying the paint 4 from each jet port while rotating the 35 around the hollow sphere 1 around the central axis A. It is a thing.

It is explanatory drawing which shows an example coating apparatus in embodiment of this invention. It is explanatory drawing which shows the coating apparatus of the other example same as the above. It is explanatory drawing which shows the coating apparatus of the other example same as the above, (a) has shown the case where one slit nozzle part is provided, (b) has shown the case where a pair of slit nozzle part is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow spherical body 1a Inner surface 3 Outer tube valve 4 Paint 5 Support member 6 Nozzle part 15 Turning mechanism 21 Autorotation mechanism 27 Advance / retreat mechanism 30 Spherical body side rotation mechanism 31 Rotation mechanism 32 Drive mechanism 33 Control part 35 Slit nozzle part A Center axis B Rotation axis

Claims (1)

A coating apparatus for applying paint to the inner surface of a hollow sphere having an opening, a rod-like support member having a tip inserted into the hollow sphere through the opening, and a paint spray supported by the tip of the support member Nozzle section, a drive mechanism for rotating the nozzle section with respect to the inner surface of the hollow sphere, an advance / retreat mechanism for moving the support member back and forth in the central axis direction, and a control section for interlocking the drive mechanism and the advance / retreat mechanism And the drive mechanism includes a turning mechanism for turning the nozzle portion with respect to the support member about a rotation axis extending in a direction orthogonal to the central axis direction of the support member, and the support member and the hollow spherical body. A rotation mechanism that relatively rotates about the central axis of the support member, and the rotation mechanism has a spray direction of the nozzle portion at a portion of the inner surface of the hollow sphere having a long distance from the central axis. To face As when to pivot the nozzle part in the turning mechanism is controlled to rotate at a small rotational speed, the turning mechanism and the reciprocating mechanism, the inner surface of the nozzle portion and the hollow spheres in a spray direction of the nozzle portion distance painting apparatus according to claim Rukoto is controlled to be kept constant.

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