JP6209102B2 - Tip cover and electrostatic coating machine with the cover attached - Google Patents

Description

  The present invention relates to a tip cover and an electrostatic coating machine to which the tip cover is attached.

  As disclosed in, for example, Patent Documents 1 to 3, an electrostatic coating machine is provided with a pin-shaped charging electrode (pin electrode) that extends and projects in the paint ejection direction in the paint ejection nozzle. Has been. A high voltage is generated between the pin electrode and the object to be coated, and the charged paint is applied to the object to be coated.

  In such an electrostatic coating machine, since the pin electrode is extremely thin, it may be deformed by an unexpected little external force. Therefore, damage to the pin electrode is conventionally prevented by attaching a cover extending from the pin electrode to the air cap.

  Further, it is necessary to clean the paint passage with a cleaning liquid such as thinner after finishing the painting or changing the color of the paint. However, since the paint passage is arranged immediately next to the air supply port, it is necessary to take care not to allow the cleaning solution to enter the air supply port when the cleaning solution flows through the paint passage.

JP 2005-224728 A Japanese Patent No. 3335937 JP 2008-36484 A

  The present invention has been made based on such circumstances, and its purpose is to protect the pin electrode from external troubles even during normal time and during cleaning, and intrusion of cleaning liquid or the like into the air supply port during cleaning. It is an object of the present invention to provide a tip cover that can prevent the above and an electrostatic coating machine having the tip cover attached thereto.

The present invention is grasped by the following composition.
(1) The tip cover of the present invention is a tip cover provided on the tip side of the electrostatic coating machine, and includes a cylindrical member having a first opening and a second opening opposite to the first opening, and the second opening side. A second opening side mounting structure for mounting on the outer periphery on the tip side of the electrostatic coating machine body, instead of an air cap provided on the tip side of the electrostatic coating machine body, In the state where the cylindrical member is attached to the outer periphery of the tip end side of the electrostatic coating machine main body in the second opening side mounting structure, the tip opening side of the electrostatic coating machine main body is connected to the first opening. A closing portion is provided that allows the paint spraying portion to communicate and closes the air supply port on the tip side of the electrostatic coating machine main body.
(2) The tip cover according to the present invention is the tip (1), wherein the cylindrical member is provided on an inner periphery on the first opening side, and is on the tip side of the electrostatic coating machine main body. A first opening side mounting structure is provided for mounting on an outer periphery of the air cap connected to the air supply port of the electrostatic coating machine main body.
(3) In the tip cover of the present invention, in the configuration of (2), the first opening side mounting structure is provided on the inner periphery on the first opening side, and grips the outer periphery of the air cap with elastic force. Has an elastic body.
(4) The electrostatic coating machine of the present invention includes an electrostatic coating machine main body having a paint spraying portion and an air supply port on the tip side, an air cap attached to the outer periphery on the tip side of the electrostatic coating machine body, An electrostatic coating machine main body and a tip cover that can be attached to the air cap, and the tip cover is configured as described in any one of (1) to (3) above.

  According to the tip cover configured in this way and the electrostatic coating machine with the cover attached, the pin electrode can be protected from external disturbances during normal and cleaning, and the cleaning liquid can be prevented from entering the air supply port during cleaning. become able to.

It is a side view which shows the whole electrostatic coating machine of this invention. It is sectional drawing which showed the detail of the structure of the pin electrode in the front end side of an electrostatic coating machine main body, a coating material nozzle, and an air cap. It is an enlarged view which shows the front-end | tip cover inserted in the air cap attached to the front end side of the electrostatic coating machine main body. It is the figure which showed the state which attached the front-end | tip cover 70 to this front end side, when wash | cleaning the front end side of an electrostatic coating machine. In the state shown in FIG. 4, the front-end | tip cover is the perspective view which fractured | ruptured one side with respect to the plane containing a central axis.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.

(Embodiment 1)
FIG. 1 is a side view showing the entire electrostatic coating machine of the present invention. In addition, the part of the front-end | tip cover attached to this electrostatic coating machine is shown with sectional drawing.

  An electrostatic coating machine 10 shown in FIG. 1 is, for example, of a gun type, and generally includes a main body (electrostatic coating machine main body) 20 having a paint nozzle 40 built in the tip side (left side in the figure) and a rear side of the main body. Holding part 30 provided on the part (right side in the figure).

  A paint tube 21 is connected to the front portion (left side in the figure) of the main body 20, and paint is supplied to the paint nozzle 40 through the paint tube 21, and the paint is supplied from a paint jet 41 (see FIG. 2) of the paint nozzle 40. It comes to be ejected. The paint tube 21 is fixed to the bottom of the grip portion 30 at the paint supply port 21A.

  An air supply port 30 </ b> A is provided at the bottom of the grip portion 30, and the air supplied through the air supply port 30 </ b> A passes through the grip portion 30 and the body 20, and surrounds the paint nozzle 40 on the front end side of the body 20. It is ejected from the air hole of the air cap 50 attached by the above.

  The paint ejected from the paint nozzle 40 is atomized by the air ejected from the air cap 50 and ejected forward (left side in the figure).

  The ejection of paint from the paint nozzle 40 and the ejection of air from the air cap 50 are controlled by operation of a trigger 25 pivotally supported on the main body 20 in front of the grip portion 30.

  A pin electrode 26, which is a pin-shaped charging electrode disposed on the central axis in the paint nozzle 40, is disposed on the front end side of the main body 20 so as to protrude forward from the paint nozzle 40. Thereby, the coating material from the coating material nozzle 40 is jetted around the pin electrode 26 along the longitudinal direction. The pin electrode 26 is applied with a high voltage by a high voltage generator 23 built in the main body 20. Thereby, the electrostatic coating machine 10 generates a high voltage between the object to be coated (not shown), and the charged paint is applied to the object to be coated.

  FIG. 2 is a cross-sectional view showing details of the configuration of the pin electrode 26, the paint nozzle 40, and the air cap 50 described above on the distal end side of the main body 20. In FIG. 2, the paint nozzle 40 and the air cap 50 are illustrated as being removed from the main body 20 in the axial direction.

  As shown in FIG. 2, a nozzle insertion hole 20 </ b> H for inserting the rear end portion of the paint nozzle 40 is provided on the front end side of the main body 20. In this specification, the vicinity including the nozzle insertion hole 20H may be referred to as a paint ejection portion. A pin electrode 26 is arranged on the central axis of the nozzle insertion hole 20H so that the tip protrudes from the nozzle insertion hole 20H. The paint nozzle 40 is fitted into the nozzle insertion hole 20H of the main body 20 such that the pin electrode 26 is disposed on the central axis of the nozzle hole 40A. As a result, the pin electrode 26 is arranged so as to protrude forward from the paint outlet 41 of the paint nozzle 40.

  The paint nozzle 40 is arranged in the main body 20 so that the paint from the paint tube 21 is supplied to the nozzle hole 40A of the paint nozzle 40, and the paint outlet 41 of the paint nozzle 40 is opened and closed. It is controlled by the axial movement of the needle 20N arranged on the central axis of the nozzle hole 40A of the nozzle 40. The needle 20N is disposed on the central axis of the nozzle insertion hole 20H, and the movement in the axial direction is performed in conjunction with the operation of the trigger 25 (see FIG. 1).

  Further, an air cap 50 is detachably fitted to the distal end side of the main body 20 so as to cover the paint nozzle 40 disposed in the main body 20.

  The air cap 50 has a hole 51 through which the portion of the paint nozzle 41 of the paint nozzle 40 protrudes at the center, and a pair of opposing corners with the hole 51 in between at the tip surface (the left surface in the figure). The (one) part 52 is attached.

  When the air cap 50 is attached to the front end side of the main body 20, air from the air supply port 27 formed around the nozzle insertion hole 20H in the front end surface 20F of the main body 20 is guided into the air cap 50, and each corner. It is made to eject through the hole 54 formed in the surface which the (one) part 52 mutually opposes. The holes 54 are provided such that the axial direction thereof is inclined and intersects with the direction in which the paint is ejected from the paint nozzle 40. As a result, the paint from the paint nozzle 40 is ejected in a state of being atomized by the air from the hole 54 of the air cap 50. In this case, the atomized paint can change the cross-sectional pattern by changing the amount of air from the holes 54 in the corners 52 of the air cap 50. Note that air supplied from the bottom surface of the grip portion 30 (see FIG. 1) is guided to the air supply port 27 formed in the front end surface 20F of the main body 20 through an air passage (not shown) of the main body 20. It has become.

  As shown in FIG. 1, the coating material nozzle 40 (see FIG. 2) and the air cap 50 are sequentially fitted on the front end side of the main body 20, and these are attached to the main body 20 via the cap cover 60. It has become. Further, the tip cover 70 is detachably attached to the air cap 50 so as to sufficiently surround the pin electrode 26.

FIG. 3 is an enlarged view showing the tip cover 70 fitted in the air cap 50 attached to the tip side of the main body 20.
As shown in FIG. 3, the tip cover 70 is made of a cylindrical member, and the side fitted into the air cap 50 is the first opening 70 </ b> A. A first opening side mounting structure for mounting on the outer periphery of the air cap 50 is provided on the inner periphery of the first opening 70A of the tip cover 70, and this first opening side mounting structure is provided in the first opening 70A. An elastic body 72 that holds the outer periphery of the air cap 50 with an elastic force is embedded in a groove 70 </ b> D formed along the circumferential direction on the inner periphery. The elastic body 72 has a circular cross section, for example, and is made of any one resin selected from ethylene resin, nylon resin, and fluorine resin.

  The first opening 70A of the tip cover 70 has an inner diameter that is approximately the same as that of the air cap 50 and can be fitted to the middle portion in the axial direction. From the middle of the direction to the second opening 70B opposite to the first opening 70A, the diameter is small (meaning a diameter smaller than the first opening 70A) and communicates with the second opening 70B. .

  Here, on the surface of the tip cover 70 on the second opening 70B side, an annular recess 75 is formed so as to surround the second opening 70B and be coaxial with the second opening 70B. As will be described later, the recessed portion 75 functions as a closing portion that closes the air supply port 27 exposed to the tip side when the tip side of the electrostatic coating machine 10 is cleaned.

  The electrostatic coating machine 10 to which the tip cover 70 is attached as shown in FIG. 3 can protect the pin electrode 26 from an external failure by the tip cover 70 in a normal state.

  FIG. 4 is a view showing a state in which the tip cover 70 is attached so that the second opening 70 </ b> B is on the tip side of the electrostatic coating machine 10 when the tip side of the electrostatic coating machine 10 is cleaned. . In this case, as shown in FIG. 2, the air cap 50 and the paint nozzle 40 are sequentially removed from the main body 20 of the electrostatic coating machine 10, and the pin electrode 26 and the needle 20N protrude from the nozzle insertion hole 20H toward the front end side of the main body 20. This is done by attaching the tip cover 70.

  As shown in FIG. 4, in the tip cover 70, the screw groove 70 </ b> P formed on the inner peripheral surface of the recessed portion 75 on the second opening 70 </ b> B side is screwed with the screw groove 20 </ b> P formed on the outer periphery on the tip side of the main body 20. Thus, it can be attached to the main body 20. That is, the second opening 70 </ b> B side of the tip cover 70 is attached to the outer periphery on the tip side of the main body 20 by having a second opening side mounting structure including a screw groove 70 </ b> P formed on the inner peripheral surface of the recessed portion 75. It is like that. In this case, the screw groove 20P formed on the outer periphery of the front end side of the main body 20 can also be used as a screw groove for screwing the air cap 50, for example.

  The second opening side mounting structure does not necessarily have to be configured to be used also as the screw groove 20P for screwing the air cap 50, and is separately attached to the outer periphery on the front end side of the main body 20 instead of the air cap. Any structure can be used. However, since it is not necessary to provide a new structure in the main body 20 by being configured to be used also as the screw groove 20P to which the air cap 50 is screwed, the tip cover 70 that can be applied to those already on the market is provided. Is possible.

  In this case, the distal end side of the main body 20 from which the air cap 50 and the paint nozzle 40 (see FIG. 2) are removed is positioned in the recessed portion 75 formed on the second opening 70B side of the distal end cover 70 together with the air supply port 27. Thus, the air supply port 27 is closed by the tip cover 70. That is, the recessed portion 75 has a function as a closing portion that closes the air supply port 27 on the front end side when the front end side of the electrostatic coating machine 10 is cleaned.

  FIG. 5 is a perspective view in which the tip cover 70 is broken on one side with respect to a plane including the central axis in the state shown in FIG. 4. As apparent from FIG. 5, the air supply port 27 exposed to the distal end side of the main body 20 is positioned in the recessed portion 75 of the distal end cover 70 by screwing of the distal end cover 70 and is closed by the distal end cover 70. In this state, the entry of moisture and the like is prevented.

  The nozzle insertion hole 20 </ b> H in which the pin electrode 26 is erected at the center is exposed through the first opening 70 </ b> A and the second opening 70 </ b> B of the tip cover 70 on the tip side of the main body 20. Therefore, sufficient protection of the pin electrode 26 can be achieved even during cleaning, and the cleaning liquid can be prevented from entering the air supply port 27 regardless of the orientation of the electrostatic coating machine 10 during cleaning.

(Embodiment 2)
In the first embodiment, a so-called gun type is described. However, the present invention is not necessarily limited to this, and other types may be used.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

10 Electrostatic coating machine 20 Main body (electrostatic coating machine main body)
20H Nozzle insertion hole 20N Needle 20P Screw groove 21 Fuel tube 23 High voltage generator 25 Trigger 26 Pin electrode 27 Air supply port 30 Grip portion 30A Air supply port 40 Paint nozzle 40A Nozzle hole 41 Paint jet port 50 Air caps 51, 54 Hole 52 Square part 60 Cap cover 70 Tip cover 70A First opening 70B Second opening 70D Groove 70P Screw groove 72 Elastic body 75 Recessed part

Claims (4)

A tip cover provided on the tip side of the electrostatic coating machine,
A tubular member having a first opening and a second opening opposite to the first opening;
A second opening side mounting structure that is provided on the inner periphery of the second opening side and is attached to the outer periphery of the electrostatic coating machine main body on the front end side instead of the air cap provided on the distal end side of the electrostatic coating machine main body And comprising
In the state where the cylindrical member is attached to the outer periphery of the tip end side of the electrostatic coating machine main body in the second opening side mounting structure, the tip opening side of the electrostatic coating machine main body is connected to the first opening. A tip cover, comprising: a closing portion that allows the paint spraying portion to communicate and closes the air supply port on the tip side of the electrostatic coating machine body.   The cylindrical member is provided on the inner periphery on the first opening side, and is on the tip side of the electrostatic coating machine body and connected to the air supply port of the electrostatic coating machine body. The tip cover according to claim 1, further comprising a first opening side attachment structure attached to the outer periphery.   3. The tip cover according to claim 2, wherein the first opening side mounting structure includes an elastic body that is provided on an inner periphery of the first opening side and grips an outer periphery of the air cap with an elastic force. An electrostatic coating machine,
An electrostatic coating machine main body having a paint ejection part and an air supply port on the tip side;
An air cap attached to the outer periphery of the front end side of the electrostatic coating machine body;
A tip cover attachable to the electrostatic coating machine main body and the air cap,
The electrostatic coating machine, wherein the tip cover is the tip cover according to any one of claims 1 to 3.

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