JPH0127882Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a gun head that constitutes a discharge port of an electrostatic powder gun used in performing electrostatic powder coating.

Prior Art A conventional gun head is formed of a single cylindrical body, which is screwed onto the tip of the barrel of an electrostatic powder gun to form an electrostatic powder gun.

When this electrostatic powder gun is aimed at an object to be coated and sprays powder paint, a portion of the powder paint that is not applied to the object adheres to the outer periphery of the gun head.
There is a risk that this will accumulate and peel off carelessly, and the lumps will adhere to the object to be coated, resulting in defective products.

Furthermore, if the object to be coated has been heated in advance and is to be coated, there is a risk that the powder coating adhering to the outer periphery of the gun head will melt due to the heat and stick to the gun head.

In order to prevent the above-mentioned situation, the applicant of this application first covered the barrel of the electrostatic powder gun with a cooling tube, and fitted the tip of the barrel with a breathable cylindrical cover made of a breathable material. However, I applied for the
(Refer to No. 57-17892) This is because the gun head cannot be attached to or detached from the gun barrel unless the air-permeable cylindrical cover is removed from the cooling tube to expose the gun head. When replacing the gun head due to changes, or when performing maintenance, inspection, and adjustment inside the gun, it takes time to attach and detach the gun head, which significantly reduces work efficiency.

Means for solving the problem: The inner circumferential edges of both ends of an air-permeable outer cylinder are tightly fitted into the outer circumferential edges of both front and rear ends of an inner cylinder, which has a shape suitable for the discharge pattern of the powder coating. A pressurized air chamber is formed between the outer circumferential surface between both ends of the cylinder and the inner circumferential surface between both ends of the air-permeable outer cylinder. It is equipped with a pressurized air supply port that communicates with the pressurized air chamber.

Function The gun head of the present invention is screwed onto the tip of the barrel of an electrostatic powder gun, and charged powder is discharged from the gun head toward the object to be coated. Even if the powder comes close to the outer circumferential surface of the air-permeable outer cylinder, the compressed air sent from the pressurized air supply port remains in the pressure air chamber, and this leaks out toward the entire outer circumferential surface of the air-permeable outer cylinder. Therefore, it does not adhere to the outer peripheral surface of the air-permeable outer cylinder.

Also, when attaching or detaching the proposed gun head to the tip of the gun barrel, with the air-permeable outer tube attached to the outside of the inner tube, grasp the outside of the outer tube with your palm and pull the outer tube and inner tube together. It rotates to unscrew and refit the gun barrel.

Embodiment An air-permeable outer cylinder 2 made of an air-permeable material such as sintered synthetic resin is concentrically covered on the outside of an inner cylinder 1 having a shape that matches the discharge pattern of powder, and the front end of the outer cylinder 2 is An inward facing flange 3 is formed on the inside, and an inner peripheral edge 3a of the flange 3 is tightly fitted to the front end outer peripheral edge 1a of the inner cylinder 1. In addition, the inner peripheral edge 2a of the rear end of the outer cylinder 2 is tightly fitted to the outer peripheral surface of the outward facing flange 4 formed on the outside of the rear end of the inner cylinder 1, and the two are fixed to each other in this fitted part. A pin 5 is provided.

In this way, a pressure air chamber 6 is formed between the outer circumferential surface 1c of the inner cylinder 1 other than the front end and the rear end, and the inner circumferential surface 2c of the outer cylinder 2 other than the front end and the rear end.

Furthermore, a pressurized air supply port 7 communicating with the pressurized air chamber 6 is bored in the outward facing flange 4 at the rear end of the inner cylinder 1,
An air pipe 8 is connected to this, and clean air is supplied from a pressurized air source (not shown).

The pressurized air sent into the pressurized air chamber 6 is exuded outward through small air permeable holes formed on the entire circumferential surface of the air permeable outer cylinder 2.

At this time, the powder that approaches the outer circumferential surface of the outer cylinder 2 is kept away by the clean air exuded from the air holes, and does not adhere to the outer circumferential surface of the outer cylinder 2.

Further, a screw 9 is carved on the rear inner surface of the inner cylinder 1,
It is screwed into the tip of the gun barrel 10.

When inspecting or maintaining the inside of the barrel 10 of the powder coating gun 11, or when replacing the gun head with a gun head of a shape suitable for the type of object to be coated, the outer cylinder 2 is attached to the inner cylinder 1 while the outer cylinder 2 is still attached to the inner cylinder 1. It is gripped from the outside of the outer cylinder 2 and rotated to tighten or loosen the screw 9.

The illustrated powder coating gun 11 is used by being installed in a coating booth (not illustrated), and the powder coating gun 11 is fixed to a holder 12, and a powder supply pipe 14 and a power cord are connected to the gun 11. 15. Connect the clean air pipe 16, and from this, powder,
Electricity and clean air are supplied, and charged powder paint is discharged from the gun head toward the object to be coated in an appropriate pattern, but these are the same as general powder guns. Detailed explanation will be omitted.

Effect Since the main idea is as described above, the powder discharged from the gun head is not deposited on the object to be coated, but the powder close to the outside of the gun head oozes out from the through hole of the air permeable outer cylinder. The pressurized air allows it to be moved away from the outside of the gun head, thereby avoiding powder deposits there and the problems described above.

In addition, the entire gun head can be easily rotated relative to the gun barrel while the air-permeable outer cylinder remains fixed to the inner cylinder, making it extremely easy to attach and remove the gun head. The operation of attaching and detaching the gun head is easier and more efficient than that in which an air-permeable cylinder is screwed onto the tip of the cooling cylinder.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway side view of the gun head of the powder coating gun of the present invention, Figure 2 is a rear view of Figure 1, and Figure 3 is a partially cutaway side view of the powder coating gun with the gun head of the present invention attached. It is. DESCRIPTION OF SYMBOLS 1...Inner cylinder, 2...Air-permeable outer cylinder, 4...Outward flange, 6...Pressure air chamber, 7...Pressure air supply port.

Claims (1)

[Scope of utility model registration request] The inner circumferential edges of both ends of the air-permeable outer cylinder are tightly fitted to the outer circumferential edges of both ends of the inner cylinder, and the outer circumferential surface of the inner cylinder other than both ends and the outer circumferential surface of the air-permeable outer cylinder other than both ends are closely fitted. A gun head for an electrostatic powder gun that has a pressurized air chamber formed between it and a pressurized air supply port that communicates with the pressurized air chamber.