Needle rod and needle plug structure for spray gun

Abstract

The utility model discloses a needle bar and needle plug structure for a spray gun, which comprises a gun body, a needle bar, a nozzle, an atomizing cap and a trigger, and a coating channel is arranged in the nozzle. A mounting cavity for mounting the nozzle is formed in the gun body, a needle plug is arranged at the end, corresponding to the nozzle, of the needle rod, the needle plug synchronously and axially moves along with the needle rod to abut against or be separated from the side face of the nozzle, so that a coating channel in the nozzle is opened and closed, and the needle plug cannot be located in the coating channel of the nozzle when abutting against or being separated from the side face of the nozzle. The needle plug moves along with the needle rod to abut against or separate from the side face of the nozzle and open and close the coating channel in the nozzle, the needle plug cannot be located in the coating channel of the nozzle when abutting against or separating from the side face of the nozzle, and the needle plug cannot block the coating channel of the nozzle, so that discharging is smoother, a gun is not blocked, and the service life of the gun is prolonged. And the spraying effect is not influenced. For different coatings, only the nozzles of the coating channels with different calibers need to be replaced, and replacement and use are very convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of spray guns, and particularly relates to a needle rod and needle plug structure for a spray gun. Background Technique

[0002] A spray gun is a tool for paint spraying. The spray gun sprays the paint from the nozzle by using the rapid release of compressed air as power. The design between the nozzle and the needle rod is particularly important for the spraying effect.

[0003] In the existing spray gun, the needle rod is positioned and connected through a guiding screw and a sealing seat and penetrates through the gun body, and is linked with the trigger. When in use, pressing the trigger drives the needle rod to move to generate a paint gap between the needle rod and the nozzle. At the same time, the compressed gas is opened to carry the paint out through the nozzle from the atomizing cap for atomization use; however, during the use process, the needle rod is still in the nozzle. Therefore, the channel in the nozzle is smaller than the actual design, which will cause blockage to the paint passing through the nozzle, affect the discharge and easily block the gun, especially when spraying various paints such as water-in-water, water-in-sand, crystal paint, and flake paint containing particles, thus affecting the spraying effect; at the same time, when aiming at different paints, such as water-in-water, water-in-sand, crystal paint, flake paint, etc., different nozzles need to be replaced. Due to the limitation of the existing design structure, it is not as simple as just replacing the nozzle. Multiple accessories such as the nozzle, atomizing cap, the needle rod matching the nozzle, the guiding screw and the sealing seat matching the needle rod all need to be replaced, which is very troublesome to replace; therefore, it is very necessary to improve the defects existing in the above existing structure. Summary of the Invention

[0004] The purpose of the utility model is to solve the problems raised in the above background technique, and provide a needle rod and needle plug structure for a spray gun.

[0005] To achieve the above purpose, the technical solution of the utility model is: a needle rod and needle plug structure for a spray gun, including a gun body, a needle rod, a nozzle, an atomizing cap, and a trigger. A paint channel is arranged in the nozzle, and the needle rod is positioned and connected through a guiding screw and a sealing seat and penetrates through the gun body; an installation cavity for installing the nozzle is arranged on the gun body. A needle plug is arranged at the end of the needle rod corresponding to the nozzle. The needle plug moves axially synchronously with the needle rod to realize abutting against or separating from the side of the nozzle, thereby realizing the opening and closing of the paint channel in the nozzle. When the needle plug abuts against or separates from the side of the nozzle, it will not be in the paint channel of the nozzle.

[0006] In the above needle rod and needle plug structure for a spray gun, a feed regulating valve is arranged on the gun body. A feed channel is arranged in the feed regulating valve. The feed channel is correspondingly communicated with the installation cavity, and their axes L1 are perpendicular. In the fully opened state of the spray gun when the needle plug separates from the side of the nozzle, and the needle plug and the end of the nozzle are respectively on both sides of the axis L1 of the feed channel.

[0007] In the above-mentioned needle rod and needle plug structure for a spray gun, an auxiliary sealing step is provided at the end of the nozzle corresponding to the needle plug, and the needle plug forms a butt against the auxiliary sealing step in the closed state of the spray gun.

[0008] In the above-mentioned needle rod and needle plug structure for a spray gun, the needle plug is fixedly screwed to the end of the needle rod.

[0009] In the above-mentioned needle rod and needle plug structure for a spray gun, the feed regulating valve includes a feed joint, an adjusting screw, and an adjusting screw seat. By rotating the adjusting screw clockwise or counterclockwise, the position of its end in the feed channel can be adjusted.

[0010] In the above-mentioned needle rod and needle plug structure for a spray gun, the end of the adjusting screw corresponding to the feed channel is designed with an arc-shaped transition.

[0011] In the above-mentioned needle rod and needle plug structure for a spray gun, a groove that can be matched with the end of the adjusting screw is provided on the inner wall of the feed channel.

[0012] Adopting the above technical solutions, the present utility model has the following beneficial effects:

[0013] A needle plug is provided at the end of the needle rod of the present utility model. The needle plug moves axially synchronously with the needle rod to realize the butt against or separation from the side of the nozzle, thereby realizing the opening and closing of the paint channel in the nozzle; when the needle plug butts against or separates from the side of the nozzle, it will not be in the paint channel of the nozzle. In the use state of the spray gun, the needle plug will not cause any blockage to the paint channel of the nozzle, so the material discharge is smoother and the gun is not blocked, and the spraying effect will not be affected.

[0014] For water-in-water, water-in-sand, crystal paint, flake paint, etc., different nozzles need to be replaced. Since the opening and closing state of the spray gun is realized by the butt against or separation of the needle plug from the side of the nozzle, only the nozzle with a different caliber paint channel needs to be replaced. Compared with the existing structure, for example, multiple accessories such as the needle rod supporting the nozzle, the guiding screw and the sealing seat cooperating with the needle rod do not need to be replaced, so it is very convenient to replace and use.

[0015] At the same time, a feed regulating valve is provided. The feed channel in the feed regulating valve is communicated with the paint channel in the nozzle. During the spraying process, if it is necessary to adjust the size of the material discharge of the spray gun, the function of adjusting the feed size can be directly realized by rotating the adjusting screw clockwise or counterclockwise. However, in the existing structure, if it is necessary to adjust the feed size, it is necessary to return to the position of the pressure barrel to adjust the pressure of the paint barrel to adjust the material discharge, which is time-consuming and laborious and very troublesome. The design of adjusting the feed size of this structure is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a sectional structure diagram of the present utility model. Detailed implementation manners

[0017] The present utility model will be further described in conjunction with the accompanying drawings.

[0018] Please refer to Figure 1 , the present utility model provides a needle rod and needle plug structure for a spray gun, including a gun body 1, a needle rod 2, a nozzle 3, an atomizing cap 4, and a trigger 5. A paint passage 6 is provided in the nozzle 3. The needle rod 2 is positioned and connected through a guiding screw 7 and a sealing seat 8 and penetrates through the gun body 1. An installation cavity 9 for installing the nozzle 3 is provided on the gun body 1. A needle plug 10 is provided at the end of the needle rod 2 corresponding to the nozzle 3. Preferably, the needle plug 10 is screwed and fixed to the end of the needle rod 2.

[0019] During use, pressing the trigger 5 will drive the needle rod 2 to move for spraying. The needle plug 10 moves axially synchronously with the needle rod 2, and the needle plug 10 separates from the side of the nozzle 3, so as to open the paint passage 6 in the nozzle 3. When the trigger 5 is released, the needle plug 10 moves back with the needle rod 2, and the needle plug 10 is in sealing contact with the side of the nozzle 3, so as to close the paint passage 6 in the nozzle 3. During the use of the spray gun, when the needle plug 10 moves synchronously with the needle and abuts against or separates from the side of the nozzle 3, it will not be in the paint passage 6 of the nozzle 3. In the use state of the spray gun, the needle plug 10 will not cause any blockage to the paint passage of the nozzle 3. In this way, the material discharge is smoother and the gun is not blocked, and the spraying effect will not be affected.

[0020] For water-in-water, water-in-sand, crystal paint, flake paint, etc., different nozzles need to be replaced. Since the opening and closing state of the spray gun is realized by the abutment or separation of the needle plug 10 and the side of the nozzle 3, only the nozzle with a paint passage of different diameters needs to be replaced. Compared with the existing structure, for example, multiple accessories such as the needle rod matching the nozzle, the guiding screw and the sealing seat matching the needle rod do not need to be replaced. Therefore, it is very convenient to replace and use.

[0021] Further, a feed regulating valve 11 is provided on the gun body 1. A feed passage 12 is provided in the feed regulating valve 11. The feed passage 12 communicates with the installation cavity 9 correspondingly and their axes L1 are perpendicular. In the fully open state of the spray gun when the needle plug 10 separates from the side of the nozzle 3, and the needle plug 10 and the end of the nozzle 3 are respectively on both sides of the axis L1 of the feed passage 12; thus ensuring that the needle plug 10 will not cause any blockage to the feed in the feed passage 12 and ensuring smooth feed.

[0022] Further, an auxiliary sealing step 13 is provided at the end of the nozzle 3 corresponding to the needle plug 10. In the closed state of the spray gun, the needle plug 10 abuts against the auxiliary sealing step 13, so as to improve the sealing performance of the abutment and closing of the needle plug and the side of the nozzle in the closed state.

[0023] Specifically, the feed regulating valve 11 includes a feed joint 14, an adjusting screw 15, and an adjusting screw seat 16. By rotating the adjusting screw 15 clockwise or counterclockwise, the position of its end in the feed channel 12 can be adjusted. During the spraying process, if it is necessary to adjust the size of the paint output from the spray gun, the function of adjusting the feed size can be directly achieved by rotating the adjusting screw clockwise or counterclockwise.

[0024] Further, the end of the adjusting screw 15 corresponding to the feed channel 12 is designed with an arc transition. The head of the adjusting screw adopts an arc transition structure, so that the paint will not be scratched and the gun will not be blocked when opening and closing; furthermore, a groove 17 that can be matched with the end of the adjusting screw 15 is provided on the inner wall of the feed channel 12. The groove 17 cooperates with the arc-shaped head of the adjusting screw 15, making it more reliable when closing the feed.

[0025] At the same time, a feed regulating valve is provided, and the feed channel in the feed regulating valve communicates with the paint channel in the nozzle, thereby realizing the function of adjusting the feed size.

[0026] The above has introduced in detail a needle rod and needle plug structure for a spray gun provided by an embodiment of the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the technical solution disclosed by the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A needle bar and needle plug structure for a spray gun, comprising a gun body (1), a needle bar (2), a nozzle (3), an atomizing cap (4), and a trigger (5), wherein a paint channel (6) is provided in the nozzle (3), and the needle bar (2) is inserted into the gun body (1) by being positioned and connected with a sealing seat (8) through a guide screw (7); the characteristics are: The gun body (1) is provided with a mounting cavity (9) for mounting the nozzle (3); the ends of the needle rod (2) corresponding to the nozzle (3) are provided with needle plugs (10); the needle plug (10) moves axially synchronously with the needle rod (2) to abut against or separate from the side of the nozzle (3), thereby realizing the opening and closing of the paint channel (6) in the nozzle (3); when the needle plug (10) abuts against or separates from the side of the nozzle (3), it will not be in the paint channel (6) of the nozzle (3).

2. The needle bar and needle plug structure for a spray gun according to claim 1, characterized in that: The gun body (1) is provided with a feed regulating valve (11), and a feed channel (12) is provided in the feed regulating valve (11). The feed channel (12) is correspondingly connected to the mounting cavity (9), and the axes L1 of the two are perpendicular. When the needle plug (10) and the nozzle (3) are separated from each other and the spray gun is in a fully opened state, the needle plug (10) and the ends of the nozzle (3) are respectively located on both sides of the axis L1 of the feed channel (12).

3. A needle bar and needle plug structure for a spray gun according to claim 1 or 2, characterized in that: An auxiliary sealing step (13) is provided at the end of the nozzle (3) corresponding to the needle plug (10); when the spray gun is in a closed state, the needle plug (10) and the auxiliary sealing step (13) are in abutment with each other.

4. The needle bar and needle plug structure for a spray gun according to claim 3, characterized in that: The needle plug (10) is threadably screwed and fixed to the end of the needle rod (2).

5. The needle bar and needle plug structure for a spray gun according to claim 2, characterized in that: The feed regulating valve (11) comprises a feed joint (14), an adjusting screw (15), and an adjusting screw seat (16); the adjusting screw (15) can be rotated clockwise or counterclockwise to adjust the position of its end in the feed channel (12).

6. The needle bar and needle plug structure for a spray gun according to claim 5, characterized in that: The end of the adjusting screw (15) corresponding to the feed channel (12) is designed to be an arc-shaped transition.

7. The needle bar and needle plug structure for a spray gun according to claim 6, characterized in that: The inner wall of the feed channel (12) is provided with a groove (17) that can match the end of the adjusting screw (15).

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