JPH067799Y2 - Electrostatic painting gun - Google Patents

Description

[Detailed description of the device] 【Technical field】

 The present invention relates to a coating gun for performing electrostatic coating.

[Background technology]

Conventionally, as shown in FIG. 3, the shaft 3 of the coating head 2 is rotatably supported by a pair of ball bearings 4 at the tip of the gun body 1, and the shaft 3 is supported between the ball bearings 4. The rotary blade 5 is attached to the outer periphery, and the air ejected from the air jet nozzle 6 is jetted to the rotary blade 5 to rotate the coating head 2.
Further, the coating head 2 is applied with a negative high voltage and supplies the coating material to the coating head 2 from a paint nozzle 29 arranged on the back surface. Then, the coating material supplied to the coating head 2 is charged and negatively ionized, and the coating head 2
The coating material was applied to the object to be coated while being rotated. However, the paint head 2 is coated by the above operation.
Since the structure is such that the coating head 2 discharges the paint, the paint sticks to the coating head 2, and if it is left as it is, it cannot be used thereafter. Therefore, after the painting work is completed or when the color of the paint is changed, it is necessary to wash the paint stuck to the tip of the painting head 2 or the gun body 1 with a washing solvent such as thinner. The cleaning can be performed by immersing the coating head 2 in a solvent and sending air to the rotary vanes 5 to rotate the coating head 2. However, when cleaning the tip of the gun body 1, the solvent is removed from the shaft 3 There is a problem in that the shaft 3 penetrates into the inside of the gun body 1 and reaches the position of the ball bearing 4 to melt the grease of the ball bearing 4, so that the shaft 3 cannot rotate. In order to prevent the penetration of the solvent, rubber packing or the like may be inserted between the inner circumference of the tip of the gun body 1 and the shaft 3, but the shaft 3
However, since it rotates at a high speed, the wear is severe, and even if grease is applied to the rubber packing in order to reduce the wear and improve the airtightness, the grease dissolves in the solvent, and the solution cannot be solved. Further, although high-pressure air leaked from the inside of the vacant chamber 7, it hit the ball bearing 4 immediately and was decelerated, and there was not enough force to push back the solvent that had entered along the shaft 3.

[The purpose of the device]

The present invention has been made in view of the above technical background, and its purpose is to clean the paint adhering to the coating head, etc. It is to prevent the grease from being melted and washed away.

[Disclosure of device]

In the electrostatic coating gun of the present invention, a shaft 3 of a coating head 2 for spraying fine particles of paint is rotatably supported by a ball bearing 4 at a tip portion of the gun body 1, and the shaft is provided at a tip side of the ball bearing 4. 3 is provided with a rotary vane 5 and the rotary vane 5 is housed in a vacant chamber 7 which is separated from the accommodating portion of the ball bearing 4 in the gun body 1 in the axial direction of the shaft 3 through a partition wall. The rotary blade 5
It is characterized in that it is provided with an air jet nozzle 6 for rotating. Then, the coating head 2 can be rotated by the air by blowing the air from the air jet nozzle 6 to the rotary blade 5, and the shaft 3 is pivotally supported by the ball bearing 4, so that the coating head 2 can be rotated with a small air force. Can be rotated at high speed. Moreover, when the paint adhering to the coating head 2 and the gun body 1 is washed with a solvent such as thinner, even if the solvent enters the gun body 1, there is a rotation between the tip of the gun body 1 and the ball bearing 4. Since the vacant chamber 7 accommodating the blades 5 is provided in the accommodating portion of the ball bearing 4 in the axial direction of the shaft 3 so as to be separated via the partition wall,
Even if the solvent enters from the tip of the gun body 1, the force of solvent invasion is weakened by the empty chamber 7 that is wide inside, and the invaded solvent reaches the ball bearing 4 to stay in the chamber 7. This is difficult and prevents the grease of the ball bearing 4 from being melted and washed away. Further, since the high-pressure driving air in the chamber 7 is vigorously leaking from the front end of the gun body 1, the solvent that has entered the chamber 7 side along the shaft 3 is discharged to the outside of the gun body 1 by the air. It is blown off and the solvent is even less likely to penetrate. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The gun body 1 has a gun shape and includes a gun grip portion 9 and a barrel portion 10, and a trigger 11 is provided so as to face the gun grip portion 9. A hose connecting portion 12 for connecting a hose for supplying the shoveling air is provided at the bottom of the gun holding portion 9, and the air is supplied upward from the hose connecting portion 12 in the gun holding portion 9. The passage 13 is perforated, and the air supply passage 13 runs linearly in the barrel 10 through the air valve 14 at the rear end of the barrel 10 to the front end. At the front end of the barrel portion 10, an empty chamber 7 is formed so as to widen the inner circumference of the air supply passage 13, and a pair of ball bearings 4 are built in behind the empty chamber 7. . The accommodating portion for both ball bearings 4 in the gun body 1 is separated from the empty chamber 7 accommodating the rotary vanes 1 in the arrangement direction of the rotary vanes 1 and the ball bearings 4 via a partition wall. Further, both ball bearings 4 rotatably support a shaft 3 provided at the rear end of the coating head 2 arranged in front of the gun body 1, and a shaft 7 is provided in a space 7 in front of the ball bearing 4. A rotary blade 5 such as a turbo blade provided on the outer periphery of 3 is housed. Furthermore, a cap 16 is attached to the tip of the gun body 1, and a swing-off plate 15 fixed to the outer periphery of the shaft 3 is housed in the gap 25 between the gun body 1 and the cap 16. A discharge hole 26 is bored at the edge of the cap. When a liquid such as paint or a solvent for cleaning enters the gun body 1 along the shaft 3, the paint or the like reaches the shake-off plate 15 and the shake-off plate 15
It is attached to the outer peripheral surface of the cap 16 and is spun off by the centrifugal force in the outer peripheral direction, and is discharged to the outside through the discharge hole 26 of the cap 16. Further, the shaft 3 has a hollow pipe shape, and the air supply path 13
The air supplied from the air passes through the shaft 3 and the coating head 2
Is supplied to. The coating head 2 includes a nozzle 17 provided at the tip of the shaft 3 and a nozzle cap 18 surrounding the outer periphery of the nozzle 17. The bell 19 at the tip of the nozzle 17 has a bell shape, and a cylindrical connecting portion 20 for connecting the tip of the shaft 3 is provided on the back surface of the bell 19, and paint is provided on the outer periphery of the connecting portion 20. An annular groove portion 21 to be supplied is formed. Also,
A through hole 22 for passing paint is bored between the groove 21 and the inner surface of the bell 19, and a lateral hole 2 for passing air between the inner side of the connecting portion 20 and the outer peripheral surface of the bell 19.
3 is perforated. Then, when the trigger 11 is pulled, the air valve 14 is opened to supply the shaving air,
The shaving air supplied from the shaft 3 is discharged from the gap 24 between the inner circumference of the nozzle cap 18 and the outer circumference of the bell 19 through the lateral hole 23, and surrounds the paint discharged from the bell 19 in a cylindrical or conical shape. This prevents the spread and scattering of the paint. An oblique pipe 31 is obliquely provided between the lower surface of the tip of the barrel 10 and the bottom of the gun grip 9.
Is a paint supply path 27 and an electric wire wiring path 28 as shown in FIG.
It consists of The tip of the paint supply passage 28 is the barrel 1
A paint nozzle 29 having a substantially L shape is connected to the tip of the paint supply passage 27, and the tip of the paint nozzle 29 is inserted into the groove portion 21 of the painting head 2. Then, when the trigger 11 is pulled, the needle valve 36 at the tip of the barrel 10 is opened via the rod 30, the paint is supplied from the paint supply passage 27, and the paint is sprayed from the paint nozzle 29 into the groove 21. It flows from the through hole 22 into the bell 19 to form a coating film on the surface of the bell 19, which is atomized and discharged as the coating head 2 rotates. In addition, in the electric wire wiring path 28, the high voltage wire 3
2 is wired, the tip of the high voltage line 32 is connected to the coating head 2, and the coating head 2 is applied with a negative high voltage. Therefore, the coating film on the surface of the bell 19 is negatively charged, and when discharged from the surface of the bell 19, the paint becomes fine particles of negative ions, which are attracted and adhered to the object to be coated at the ground potential. . A space 33 for sending air is formed over the entire length between the inner circumference of the oblique pipe 31 and the high-voltage line 32, and a needle valve 34 is provided at the base end of the oblique pipe 31. High-pressure drive air is being sent in, and the drive air is vigorously ejected from the air ejection nozzle 6 that is opened to the side of the empty chamber 7 at the tip of the gun body 1 through the gap 33 in the diagonal pipe 31. The driving air that has been ejected and ejected causes the rotary blades 5 to rotate, which causes the coating head 2 to rotate. While the coating head 2 rotates, the fine particles of the paint are discharged by centrifugal force and the paint is evenly applied. It is done. Further, the air in the vacant chamber 7 is discharged to the outside through the exhaust passage 35. Then, when the paint adhering to the coating head 2 after use is washed with a solvent for cleaning such as thinner, the coating head 2 is dipped in the solvent and driving air is sent to the rotary vanes. Is sprayed to rotate the coating head 2 for cleaning. At this time, the gun body 1 is transmitted along the shaft 3.
Even if the solvent enters the inside, the internal space is widened at the position of the vacant chamber 7, so the momentum of the solvent infiltration is weakened in this vacant chamber 7, and the invaded solvent is deeper than the inside of the vacant chamber 7. Since it does not enter, it is difficult to reach the ball bearing 4, and it is possible to prevent the grease of the ball bearing 4 from being melted and washed. Moreover, since the high-pressure air for rotating the rotary vanes 5 is supplied into the empty chamber 7, the air pressure in the empty chamber 7 is high, and the air in the empty chamber 7 is the tip portion of the gun body 1. Solvent that has leaked from between the front end of the gun body 1 and the shaft 3 is blown away in the original direction by the air that is vigorously leaking from the chamber 7 and the direction of the ball bearing 4. Are prevented from entering.

[Effect of device]

As described above, the present invention rotatably supports a shaft of a coating head for spraying fine-particle paint by a ball bearing at the tip of the gun body, and a rotary vane is provided on the shaft on the tip side of the ball bearing for rotation. The blades are housed in an empty chamber separated from the ball bearing housing in the gun body in the axial direction of the shaft through a partition wall, and an air jet nozzle for rotating the rotary blades is provided on the side of the empty chamber. Therefore, when cleaning the paint that has adhered to the painting head or gun body with a solvent, even if the solvent penetrates into the gun body, a rotary vane is housed between the tip of the gun body and the ball bearing to protect the gun body. Since there is a vacant chamber that is separated from the ball bearing housing by a partition wall in the axial direction of the shaft, the solvent from the tip of the gun body Even if it penetrates, the wide space inside it weakens the force of solvent infiltration, and the invading solvent stays in the room, so it is difficult to reach the ball bearings and the grease on the ball bearings is washed away. There is an advantage that can prevent. Moreover, since the high-pressure drive air in the chamber is leaking vigorously from the front end of the gun body, the solvent that has penetrated the chamber along the shaft is blown out of the gun body by the air, and the solvent is further dissolved. It is difficult to penetrate. Further, the coating head can be rotated by the air by blowing the air from the air jet nozzle to the rotary blades, and the shaft is pivotally supported by the ball bearing, so that the coating head can be rotated at a high speed with a small air force. It is a thing.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view taken along line XX in FIG. 3, and FIG. 1 ... Gun body, 2 ... Painting head, 3 ... Axis, 4 ...
Ball bearing, 5 ... Rotary blade, 6 ... Air jet nozzle, 7 ... Vacancy.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A shaft of a coating head for spraying fine particle paint is rotatably supported by a ball bearing at a tip portion of a gun body, and a rotary blade is provided on the shaft at a tip side of the ball bearing to provide a rotary blade. The gun bearing body is housed in a cavity separated from the ball bearing compartment in the axial direction of the shaft through a partition wall, and an air jet nozzle for rotating the rotary vanes is provided on the side of the cavity. Electric painting gun.