Spray gun assembly

Abstract

The utility model relates to the field of plasma spraying, in particular to a spray gun assembly which comprises a spray gun and a powder feeding frame, the powder feeding frame comprises a frame body and a cleaning assembly, the frame body is detachably arranged on the spray gun, or the frame body and the spray gun are integrally formed; the cleaning assembly comprises a reciprocating power piece and a scraper, and the reciprocating power piece is used for driving the scraper to slide in a reciprocating mode in the mode of being attached to the muzzle end face of the spray gun so as to scrape knots on the muzzle end face of the spray gun. According to the embodiment, the reciprocating power piece drives the scraping plate to reciprocate in the radial direction of the spray gun, the scraping plate can slide on the end face of the muzzle in the radial direction of the spray gun in a reciprocating mode, knots on the end face of the muzzle of the spray gun are scraped, shutdown is not needed, and the spraying effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of plasma spraying, in particular to a spray gun assembly. Background Art

[0002] In the thermal spraying industry, especially in plasma spraying, a spray gun heats a special thermal spray powder with a flame and sprays it onto the workpiece to be sprayed.

[0003] During the plasma spraying process, the extremely high flame temperature and high velocity create a high negative pressure at the nozzle. This causes a small amount of thermal spray powder to be drawn into the nozzle, where it melts and adheres to the nozzle end face, forming a nodule. As spraying continues, the nodule grows larger and may be sprayed with the flame or fall onto the coating on the surface, affecting the spraying effect.

[0004] The current method of removing nodules is to stop the machine for cleaning after a certain period of spraying. However, stopping the machine to clean nodules will lead to poor spraying fluidity and affect the spraying effect. Summary of the Invention

[0005] The embodiment of the utility model provides a spray gun assembly to solve the problem in the prior art of poor spraying smoothness caused by stopping the machine to clean nodules.

[0006] The present invention provides a spray gun assembly, comprising a spray gun and a powder feeding rack, wherein the powder feeding rack comprises a frame body and a cleaning assembly, wherein the frame body is detachably mounted on the spray gun or the frame body and the spray gun are integrally formed.

[0007] The cleaning assembly includes a reciprocating power member and a scraper. The reciprocating power member is used to drive the scraper to slide back and forth in contact with the muzzle end face of the spray gun to scrape off nodules on the muzzle end face of the spray gun.

[0008] Optionally, the scraper is an arc plate, and the radius of the inner arc surface of the scraper is the same as the inner diameter of the muzzle of the spray gun, or the radius of the inner arc surface of the scraper is larger than the inner diameter of the muzzle of the spray gun.

[0009] Optionally, two cleaning assemblies are provided, and the scraper is an arc plate with an arc of 180°. The scrapers of the two cleaning assemblies can be spliced ​​to form a first annular cleaning ring, and the inner diameter of the cleaning ring is the same as the inner diameter of the muzzle of the spray gun or the inner diameter of the cleaning ring is larger than the inner diameter of the muzzle of the spray gun.

[0010] Optionally, the cleaning assembly is provided in plurality, and the scrapers of the plurality of cleaning assemblies can be spliced ​​to form a second annular cleaning ring, the inner diameter of the second cleaning ring is the same as the inner diameter of the muzzle of the spray gun or the inner diameter of the cleaning ring is larger than the inner diameter of the muzzle of the spray gun.

[0011] Optionally, the difference between the inner diameter of the cleaning ring and the inner diameter of the muzzle of the spray gun is less than 3 mm.

[0012] Optionally, a plurality of cleaning assemblies are evenly arranged around the spray gun.

[0013] Optionally, the reciprocating power member is a cylinder.

[0014] Optionally, a powder feeding mechanism is provided on the frame, and the powder feeding mechanism is evenly arranged around the spray gun, and each of the cleaning components is arranged in the circumferential interval between two circumferentially adjacent powder feeding mechanisms.

[0015] Optionally, a plurality of mounting holes are provided on the frame, and the mounting holes are arranged around the spray gun, and a reciprocating power member of the cleaning assembly is fixed in one of the mounting holes.

[0016] Optionally, the powder feeding rack is annular and is fixed on the end face of the muzzle of the spray gun.

[0017] An embodiment of the utility model provides a spray gun assembly. In this embodiment, a scraper is driven to reciprocate radially along the spray gun through a reciprocating power member. The scraper can slide back and forth radially along the end face of the muzzle of the spray gun to scrape off nodules on the end face of the muzzle of the spray gun. This embodiment can clean nodules during the spraying process without stopping the machine, thereby improving the spraying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is a front view of the actual application of the powder feeding frame in one embodiment of the utility model;

[0020] Figure 2 This is a side view of the actual application of the powder feeding rack in one embodiment of the present utility model.

[0021] Reference numerals: 100, flame; 200, nodule;

[0022] 1. Spray gun; 11. Muzzle; 2. Frame; 21. Mounting hole; 22. Powder feeding mechanism; 23. Powder feeding needle; 3. Reciprocating power part; 4. Scraper. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] In the description of the present invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] Reference Figure 1 and Figure 2 An embodiment of the present invention provides a spray gun assembly, including a spray gun and a powder feeding rack. The powder feeding rack and the spray gun are integrally formed, or the powder feeding rack is detachably installed on the spray gun. The powder feeding rack includes a frame 2 and a cleaning assembly. The frame 2 is arranged on the spray gun 1. The cleaning assembly includes a reciprocating power member 3 and a scraper 4, the reciprocating power member 3 is used to drive the scraper 4 to reciprocate along the radial direction of the spray gun 1, the scraper 4 moves between a first preset position and a second preset position, and the scraper 4 slides in contact with the end face of the muzzle 11; when the scraper 4 is in the first preset position, the scraper 4 is away from the inner wall of the muzzle 11, that is, the scraper 4 is located outside the inner wall of the muzzle 11; when the scraper 4 is in the second preset position, the scraper 4 along the radial inner wall of the spray gun 1 and the inner wall of the muzzle 11 are coincident in their orthographic projection on the end face of the muzzle 11, and when the scraper 4 slides back and forth between the first preset position and the second preset position, the scraper 4 can scrape off the nodules 200 on the end face of the muzzle 11.

[0027] The spray gun 1 in this embodiment is a flame spray gun. During the spraying process, part of the special spraying powder is heated and melted and will fall on the end face of the muzzle 11 to form nodules 200. In this embodiment, the reciprocating power part 3 drives the scraper 4 to reciprocate along the radial direction of the spray gun 1 to scrape off the nodules 200 on the end face of the muzzle 11 of the spray gun 1. By regularly starting the reciprocating power part 3, the nodules 200 can be cleaned up without stopping the machine during the spraying process.

[0028] In one embodiment, the frame 2 is detachably mounted on the spray gun 1. The frame 2 and the cleaning assembly can be detachably mounted on the spray gun 1 to achieve modification of the existing spray gun 1 and reduce the cost of modification of the spray gun 1.

[0029] In one embodiment, the frame 2 and the spray gun 1 are integrally formed. Alternatively, the frame 2 and the spray gun 1 can be produced as a whole, so that the frame 2 and the spray gun 1 are integrated, and then the cleaning assembly is mounted on the frame 2.

[0030] As an example, the scraper 4 is an arc plate, and the radius of the inner arc surface of the scraper 4 is 2 mm larger than the inner diameter of the muzzle 11. In this embodiment, a plurality of cleaning assemblies are provided, and when the scrapers 4 of the plurality of cleaning assemblies are in the second preset position, a ring-shaped second cleaning ring is spliced, and the difference between the inner diameter of the cleaning ring and the inner diameter of the muzzle of the spray gun is less than 3 mm. Because the radius of the inner arc surface of the scraper 4 is 2 mm larger than the inner diameter of the muzzle 11, the inner diameter of the second cleaning ring is 2 mm larger than the inner diameter of the muzzle 11, while improving the scraping effect as much as possible, it reduces the burns of the scraper by the plasma flame, and also tries to avoid the occurrence of the phenomenon of interfering with the shape of the flame 100 ejected from the muzzle 11. Specifically, a plurality of cleaning assemblies are evenly arranged around the spray gun 1.

[0031] In this embodiment, the thickness of the second cleaning ring along the radial direction of the spray gun 1 is much smaller than the thickness of the muzzle 11. The inner wall of the second cleaning ring and the inner wall of the muzzle 11, as projected onto the end face of the muzzle 11, overlap. This prevents the cleaning ring from radially extending into the area where the flame 100 is ejected from the muzzle 11, thereby interfering with the flame 100 ejected from the muzzle 11. This minimizes deformation of the flame 100, thereby reducing the impact of the scraper 4 on the spraying effect of the flame 100. The nodules 200 on the end face of the muzzle 11 do not have a specific distribution pattern. Therefore, to ensure that the scraper blades scrape as much area as possible, the second cleaning ring formed by the multiple scrapers 4 at the second preset position is able to cover the end face of the muzzle 11 as much as possible. Conversely, if there is a gap between two adjacent scrapers 4, the nodules 200 in the gap will continue to accumulate on the end face of the muzzle 11. During the spraying process, they may be sprayed onto the surface of the object being sprayed by the flame 100 at any time, affecting the spraying effect.

[0032] As an example, a powder feeding mechanism 22 is provided on the frame 2, and the powder feeding mechanism 22 is evenly arranged around the spray gun 1, and each of the cleaning components is arranged in the circumferential interval of two circumferentially adjacent powder feeding mechanisms 22. As mentioned above, although the second cleaning ring formed by the plurality of scrapers 4 needs to cover the end face of the muzzle 11 as much as possible, the scrapers 4 and the reciprocating power member 3 cannot conflict with the powder feeding needle 23, otherwise it will affect the normal spraying. In order to solve this problem, this embodiment is achieved by arranging each cleaning component in the circumferential interval of two adjacent powder feeding shafts. The powder feeding mechanism 22 includes a powder feeding needle 23, which is used to transport special powder for spraying. The powder feeding mechanism 22 and the powder feeding needle 23 are prior arts in this field and will not be described in detail.

[0033] As an example, the reciprocating power member 3 is a cylinder. The cylinder has the effects of fast action speed and sensitive response, and can immediately drive the scraper 4 to scrape, thereby increasing the speed of the scraping action and avoiding the increase in scraping time due to slow start of the reciprocating power member 3.

[0034] In this embodiment, the frame 2 is provided with a plurality of mounting holes 21, which are arranged around the spray gun 1. The reciprocating power member 3 of the cleaning assembly is fixed in one of the mounting holes 21. The outer wall of the cylinder is fixed in the mounting hole 21, and the telescopic rod of the cylinder reciprocates toward the center of the muzzle 11.

[0035] In one embodiment, two cleaning assemblies are provided, the scraper 4 is an arc plate, the curvature of the scraper 4 is 180°, and when the scrapers 4 of the two cleaning assemblies are in the second preset position, a first annular cleaning ring is spliced ​​out, and the inner diameter of the cleaning ring is 2 mm larger than the inner diameter of the muzzle 11 of the spray gun.

[0036] In other embodiments, the difference between the inner diameter of the cleaning ring and the inner diameter of the muzzle 11 of the spray gun may be one of 0.5 mm, 1 mm, 1.5 mm, and 2.5 mm.

[0037] In this embodiment, the scraper 4 can be simply made into a semicircular arc plate, and two semicircular arc plates can be spliced ​​together to form the entire first cleaning ring. The inner wall of the first cleaning ring and the inner wall of the muzzle 11 are slightly larger at the end face of the muzzle 11, which can improve the scraping effect as much as possible while reducing the burns of the scraper by the plasma flame, and also try to avoid the occurrence of the phenomenon of interfering with the shape of the flame 100 ejected from the muzzle 11.

[0038] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A spray gun assembly, characterized in that: It includes a spray gun and a powder feeding rack, wherein the powder feeding rack includes a frame and a cleaning assembly, wherein the frame is detachably mounted on the spray gun or the frame and the spray gun are integrally formed; The cleaning assembly includes a reciprocating power member and a scraper. The reciprocating power member is used to drive the scraper to slide back and forth in contact with the muzzle end face of the spray gun to scrape off nodules on the muzzle end face of the spray gun.

2. The spray gun assembly according to claim 1, wherein: The scraper is an arc plate, and the radius of the inner arc surface of the scraper is the same as the inner diameter of the muzzle of the spray gun, or the radius of the inner arc surface of the scraper is larger than the inner diameter of the muzzle of the spray gun.

3. The spray gun assembly according to claim 2, wherein: Two cleaning assemblies are provided, and the scraper is an arc plate with an arc of 180°. The scrapers of the two cleaning assemblies can be spliced ​​to form a first annular cleaning ring, and the inner diameter of the cleaning ring is the same as the inner diameter of the muzzle of the spray gun or the inner diameter of the cleaning ring is larger than the inner diameter of the muzzle of the spray gun.

4. The spray gun assembly according to claim 2, wherein: There are multiple cleaning assemblies, and the scrapers of the multiple cleaning assemblies can be spliced ​​into a ring-shaped second cleaning ring. The inner diameter of the second cleaning ring is the same as the inner diameter of the muzzle of the spray gun or the inner diameter of the cleaning ring is larger than the inner diameter of the muzzle of the spray gun.

5. The spray gun assembly according to claim 3 or 4, characterized in that The difference between the inner diameter of the cleaning ring and the inner diameter of the muzzle of the spray gun is less than 3 mm.

6. The spray gun assembly according to claim 4, wherein: A plurality of cleaning components are evenly arranged around the spray gun.

7. The spray gun assembly according to claim 1, wherein: The reciprocating power member is a cylinder.

8. The spray gun assembly according to claim 3 or 4, characterized in that The frame is provided with a powder feeding mechanism, which is evenly arranged around the spray gun, and each of the cleaning components is arranged in the circumferential interval between two circumferentially adjacent powder feeding mechanisms.

9. The spray gun assembly according to claim 3 or 4, characterized in that The frame is provided with a plurality of mounting holes, the mounting holes are arranged around the spray gun, and a reciprocating power member of the cleaning assembly is fixed in one of the mounting holes.

10. The spray gun assembly according to claim 1, wherein: The powder feeding frame is annular and is fixed on the end surface of the muzzle of the spray gun.

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