Switching device of pneumatic spray gun

Abstract

A switch device of a pneumatic spray gun comprises a gun body, a switch rod capable of being movably installed in a switch channel of the gun body back and forth, a material adjusting screw seat screwed at the rear end of the switch channel and a material needle inserted in a middle hole of the switch rod, a rear sealing ring is arranged at the rear end of the switch rod, and a front sealing ring and a switch sleeve are arranged at the front end of the switch rod. An air valve spring is arranged between the seasoning screw seat and the switch rod, the front end of the air valve spring abuts against the switch rod, the rear end of the air valve spring is connected with the seasoning screw seat through a flat gasket and an O-shaped sealing ring, a seasoning screw plug is screwed on the seasoning screw seat, and a seasoning spring is arranged in the seasoning screw plug. The seasoning spring is elastically supported at the shoulder position of the seasoning needle; the switch device is simple in structure, few in parts, convenient to machine and form, simple and rapid in overall assembly, and beneficial to improving the assembly efficiency and guaranteeing the qualified rate of assembled products; and the sealing surface of the rear sealing ring is a plane, so that better sealing performance can be achieved.

Description

Technical Field

[0001] The utility model relates to a switch device for a pneumatic spray gun. Background Art

[0002] A pneumatic spray gun is a type of spraying equipment that uses the rapid release of compressed air as power. Compressed air is supplied to the gun body through the air inlet pipe. When the high-pressure compressed air is ejected from the air cap in front of the gun muzzle, a negative pressure area lower than the atmospheric pressure is generated in front of the paint nozzle. The pressure difference generated at the gun muzzle sucks the paint out of the paint storage tank, and under the action of the high-speed jet force of the compressed air, it is atomized into fine particles and sprayed onto the surface of the object to be coated.

[0003] In the existing technology, the switch device that constitutes the pneumatic spray gun has many parts, which is inconvenient to assemble, and the processing accuracy requirements for the parts are relatively high, and the scrap rate of the assembled finished product is relatively high; in particular, the rear end of the switch rod and the gun body are usually a sealed assembly structure between metal and metal, which places high requirements on roundness and coaxiality. The product has air leakage problems caused by factors such as processing and assembly, which is a difficulty and pain point that has always existed in the industry. Summary of the Invention

[0004] In view of the shortcomings existing in the above problems, the utility model provides a switch device for a pneumatic spray gun.

[0005] To achieve the above-mentioned purpose, the utility model provides a switch device of a pneumatic spray gun, comprising a gun body, a switch rod movably installed in a switch channel of the gun body, a seasoning screw seat screwed at the rear end of the switch channel and a material needle inserted in the middle hole of the switch rod, the rear end of the switch rod is provided with a rear sealing ring, the front end of the switch rod is provided with a front sealing ring and a switch sleeve, the switch sleeve presses the front sealing ring, an air valve spring is provided between the seasoning screw seat and the switch rod, the front end of the air valve spring abuts against the switch rod, the rear end of the air valve spring is connected to the seasoning screw seat by a flat gasket and an O-ring, a seasoning screw plug is screwed on the seasoning screw seat, a seasoning spring is built into the seasoning screw plug, and the seasoning spring is elastically supported on the shoulder position of the material needle.

[0006] Furthermore, the gun body is provided with a rotatable trigger.

[0007] Furthermore, the front sealing ring and the rear sealing ring are both made of acid-resistant plastic, and the sealing surface between the rear sealing ring and the gun body is a plane.

[0008] The beneficial effects of the present invention compared to the prior art are:

[0009] 1. The switch device has a simple structure, few parts and is easy to process and form. The overall assembly is simple and quick, which is conducive to improving assembly efficiency and ensuring the qualified rate of assembled products.

[0010] 2. Both the front sealing ring and the rear sealing ring are made of acid-resistant plastic. Even if the pneumatic spray gun is immersed in acid solution for a long time, the air path inside the spray gun is not easily corroded, ensuring the normal function of the spray gun.

[0011] 3. The sealing surface of the rear sealing ring is flat, which can achieve better sealing and is less likely to cause air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a three-dimensional diagram of a switch device for a pneumatic spray gun according to the present invention;

[0013] Figure 2 This is a cross-sectional view of a switch device for a pneumatic spray gun according to the present invention.

[0014] In the figure: 1. Gun body; 2. Trigger; 3. Switch sleeve; 4. Front sealing ring; 5. Switch rod; 6. Feed needle; 7. Rear sealing ring; 8. Air valve spring; 9. Flat gasket; 10. O-ring; 11. Seasoning screw seat; 12. Seasoning spring; 13. Seasoning screw plug; a. Switch channel. DETAILED DESCRIPTION

[0015] like Figure 1 、 Figure 2 As shown, a switch device of a pneumatic spray gun according to an embodiment of the present invention comprises a gun body 1, a switch rod 5 movably mounted in a switch channel a of the gun body 1, a seasoning screw seat 11 screwed at the rear end of the switch channel a, and a material needle 6 inserted into the middle hole of the switch rod 5. The rear end of the switch rod 5 is provided with a rear sealing ring 7, the front end of the switch rod 5 is provided with a front sealing ring 4 and a switch sleeve 3, the switch sleeve 3 presses the front sealing ring 4, and an air valve spring is provided between the seasoning screw seat 11 and the switch rod 5. 8. The front end of the gas valve spring 8 abuts against the switch rod 5, and the rear end of the gas valve spring 8 is connected to the seasoning screw seat 11 by a flat gasket 9 and an O-ring 10. A seasoning screw plug 13 is screwed on the seasoning screw seat 11, and the seasoning screw plug 13 has a seasoning spring 12 built in. The seasoning spring 12 is elastically supported on the shoulder position of the material needle 6; a rotatable trigger 2 is also provided on the gun body 1; the front sealing ring 4 and the rear sealing ring 7 are made of acid-resistant plastic, and the sealing surface of the rear sealing ring 7 and the gun body 1 is flat.

[0016] The switch device has a simple structure, few parts and is easy to process and form. The overall assembly is simple and quick, which is conducive to improving assembly efficiency and ensuring the qualified rate of assembled products. The front sealing ring and the rear sealing ring are both made of acid-resistant plastic. Even if the pneumatic spray gun is immersed in an acid solution for a long time, the air path inside the spray gun is not easily corroded, ensuring the normal function of the spray gun. The sealing surface of the rear sealing ring is flat, which can achieve better sealing and is not prone to air leakage.

[0017] In order to facilitate understanding of the present invention, the following description will be given in conjunction with the accompanying drawings.

[0018] During the operation of the pneumatic spray gun, the material supply lags behind the air supply. In this patent solution, the trigger 2 first pushes the switch rod 5 to move and overcome the elastic force of the air valve spring 8. The air path from the air inlet of the pneumatic spray gun to the air cap is connected to realize air supply. The trigger 2 continues to rotate, and the switch rod 5 drives the material needle 6 to move. The paint port at the front end of the material needle 6 opens, and paint spraying is realized.

[0019] The assembly process of the switch device of the pneumatic spray gun involved in this patent is as follows: first, install the rear sealing ring 7 on the rear end of the switch rod 5, then install the front sealing ring 4 on the front end of the switch rod 5, and finally press the switch sleeve 3 into the switch rod 5 to fix the front sealing ring 4, and install the above-mentioned components into the switch channel a of the gun body 1, install the air valve spring 8, flat washer 9, O-ring 10, and seasoning screw seat 11, then insert the material needle 6, install the seasoning spring 12 and seasoning screw plug 13, and finally install and lock the trigger 2; because the installation is more convenient and quick, the overall product qualification rate is also higher.

[0020] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A switch device for a pneumatic spray gun, characterized in that: The invention comprises a gun body (1), a switch rod (5) movably mounted in a switch channel (a) of the gun body (1), a seasoning screw seat (11) screwed at the rear end of the switch channel (a), and a material needle (6) inserted into the middle hole of the switch rod (5), wherein the rear end of the switch rod (5) is provided with a rear sealing ring (7), and the front end of the switch rod (5) is provided with a front sealing ring (4) and a switch sleeve (3), wherein the switch sleeve (3) presses the front sealing ring (4), and the seasoning screw seat An air valve spring (8) is arranged between (11) and the switch rod (5), the front end of the air valve spring (8) is in contact with the switch rod (5), and the rear end of the air valve spring (8) is connected to the seasoning screw seat (11) by a flat gasket (9) and an O-ring (10). A seasoning screw plug (13) is screwed on the seasoning screw seat (11), and the seasoning screw plug (13) has a seasoning spring (12) built in. The seasoning spring (12) is elastically supported at the shoulder position of the material needle (6).

2. A switch device for a pneumatic spray gun according to claim 1, characterized in that: The gun body (1) is also provided with a rotatable trigger (2).

3. The switch device for a pneumatic spray gun according to claim 1, characterized in that: The front sealing ring (4) and the rear sealing ring (7) are both made of acid-resistant plastic, and the sealing surface between the rear sealing ring (7) and the gun body (1) is a plane.

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