A training target frame plasma spraying device

Abstract

The application discloses a kind of training target frame plasma spraying device, it is related to coating spraying equipment technical field, gun body is fixedly arranged on mechanical arm by base, gun body can spray plasma jet from its end by inputting plasma gas, several powder feeding pieces can simultaneously inject spraying powder into plasma jet, mounting block is rotationally connected with the end of gun body, powder feeding piece is fixedly connected on mounting block, drive assembly is set on base, and drive assembly is used to drive several mounting blocks to rotate around the axis of blowing-out cavity.The application discloses a kind of training target frame plasma spraying device, three independent molten particle dense regions are three dislocations and overlapping continuous cycloids in the moving path of material surface, and net-like interlaced coating structure is formed on the surface of stick material, the net-like structure can disperse the torsional load borne to multiple cross paths, so as to effectively improve the stress distribution state of the surface of stick material and improve the torsional fracture resistance of thin-walled hollow tube.

Description

Technical Field

[0001] This invention relates to the field of coating spraying equipment technology, and in particular to a plasma spraying device for a training target frame. Background Technology

[0002] Plasma spraying technology improves the structural strength of materials by forming a coating on the material surface. Existing plasma spraying can be automated by using a plasma spray gun mounted on a robotic arm. The plasma spray gun generates an electric arc through positive and negative electrodes, which sprays the input plasma gas to form a high-speed plasma jet. The spraying powder is injected into the jet, and the powder forms molten particles in the jet, which then strike and adhere to the material surface to form a coating.

[0003] In order to achieve a complete and uniform coating when spraying a rod-shaped object, the existing technology causes the rod-shaped object to undergo relative displacement and deflection along the axis of the rod-shaped object at the same time as the molten particles are sprayed out by the spray gun, so that the spraying area is spirally coated on the surface of the rod-shaped object along the axis of the rod-shaped object.

[0004] However, because the spraying areas need to overlap to ensure the integrity of the coating, stress concentration occurs on the surface of the rod-shaped object. The continuous spiral coating structure formed by spiral coating causes the stress to be concentrated along the spiral path when the rod-shaped object is subjected to torsional load, which aggravates the local stress level. The above stress concentration phenomenon is particularly prominent for the thin-walled hollow tubes required for assembling training target frames. Surface stress concentration can easily cause the thin-walled hollow tubes to twist and break along the spiral line of the overlapping area of ​​the spraying area when under force, affecting the safety and service life of the training target frame. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a plasma spraying device for a training target frame.

[0006] This application provides a plasma spraying apparatus for a training target frame, comprising: The gun body is fixedly mounted on the robotic arm via a base. The gun body can eject a plasma jet from its end by inputting plasma gas. The maximum diameter of the gun body's end is N. There are several powder feeding components, and several of the powder feeding components can simultaneously inject spray powder into the plasma jet; There are several mounting blocks. The mounting blocks are rotatably connected to the end of the gun body through connectors. The mounting blocks form a blow-out cavity around the extension line of the axis of the end of the gun body. The blow-out cavity is flared and has a minimum diameter of M. The powder feeding component is fixedly connected to the mounting block, and the output end of the powder feeding component forms a circle with a diameter of R, where R is greater than M and less than N. A drive assembly, disposed on the base, is used to drive a plurality of mounting blocks to rotate about the axis of the blow-out chamber.

[0007] In one embodiment, the connector includes a sleeve and a plurality of balls. An upper groove wall is formed on the periphery of the gun body, and a lower groove wall is formed on the inner wall of the mounting block. The upper groove wall and the plurality of lower groove walls combine to form a closed annular groove. A plurality of balls roll in the annular groove. The sleeve is connected to a plurality of mounting blocks by a plurality of first bolts. One of the mounting blocks has an opening that communicates with the annular groove. The opening can be closed by a second bolt.

[0008] In one embodiment, the drive assembly includes a driving gear, a driven gear, and a drive source. The drive source is mounted on a base, and its output end is coaxially fixed with the driving gear. The drive source is used to drive the driving gear to rotate. The driving gear meshes with the driven gear, and the driven gear is fixedly connected to a sleeve.

[0009] In one embodiment, the drive assembly further includes a protective cover assembled by a plurality of third bolts, the protective cover covering the drive gear and the driven gear.

[0010] In one embodiment, a rotating mechanism is further included, which drives the material to rotate around the material's axis, and the end of the robotic arm guides the gun body to translate at a constant speed along the material's axis.

[0011] In one embodiment, a plurality of the powder feeding components are evenly distributed around the periphery of the blowing chamber.

[0012] In one embodiment, the flare of the blow-out cavity faces the direction in which the plasma jet is ejected from the end of the gun body.

[0013] Compared with the prior art, the above-mentioned technical solution provided in this application has the following advantages: by setting the powder feeding component on the mounting block and making its output end surround the plasma jet with a diameter R greater than M and less than N, the amount of molten particles on the periphery of the plasma jet is greater than that in the central region. With the mounting block driving the powder feeding component to rotate, the movement paths of the three independent dense areas of molten particles on the material surface are three staggered and overlapping continuous cycloids, forming a mesh-like interwoven coating structure on the surface of the rod-shaped material. The mesh structure can disperse the torsional load it bears to multiple intersecting paths, thereby effectively improving the stress distribution state on the surface of the rod-shaped material and improving the anti-torsional fracture performance of the thin-walled hollow tube. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a cross-sectional view of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 Structural explosion of the present invention Figure 1 ; Figure 6 Structural explosion of the present invention Figure 2 ; Figure 7 This is a path diagram showing the movement of the point with the highest thickness of the molten particle accumulation. Figure 8 This is a diagram showing the spraying path of the coating on the material.

[0015] The following are the labels in the diagram: 1. Powder feeding component; 2. Base; 3. Gun body; 31. Upper trough wall; 4. Mounting block; 41. Blowout chamber; 42. Lower trough wall; 5. Sleeve; 6. Protective cover; 7. Drive assembly; 71. Drive source; 72. Drive gear; 73. Driven gear; 8. Ball bearing; 9. Robotic arm. Detailed Implementation

[0016] To provide a clearer understanding of the technical features, objectives, and effects of this invention, the specific embodiments of this invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0017] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0018] Plasma spraying technology is widely used for surface coating reinforcement of rod-shaped objects, such as forming wear-resistant or corrosion-resistant coatings on the surface of thin-walled hollow tubes of training target frames. Although the existing spiral coating method can achieve coating coverage, stress concentration is easily formed in the overlapping area of ​​the coating and spreads along the spiral path, causing the thin-walled hollow tube to twist and break under stress.

[0019] A plasma spraying device for a training target frame, such as Figures 1 to 8As shown, the device includes a gun body 3, a base 2, a powder feeding component 1, a mounting block 4, and a drive assembly 7. The gun body 3 is fixedly mounted on the robotic arm 9 via the base 2. The gun body 3 can eject a plasma jet from its end by inputting plasma gas. The maximum diameter of the end of the gun body 3 is N. There are several powder feeding components 1, which can simultaneously inject spray powder into the plasma jet. There are several mounting blocks 4, which are rotatably connected to the end of the gun body 3 via connectors. Several mounting blocks 4 form a blow-out cavity 41 around the extension line of the axis of the end of the gun body 3. The blow-out cavity 41 is flared and has a minimum diameter of M. The powder feeding component 1 is fixedly connected to the mounting block 4, and the diameter of the circle formed by the output ends of several powder feeding components 1 is R, which is greater than M and less than N. The drive assembly 7 is mounted on the base 2 and is used to drive several mounting blocks 4 to rotate around the axis of the blow-out cavity 41. like Figure 3 as well as Figure 4 As shown, the connector includes a sleeve 5 and several balls 8. An upper groove wall 31 is formed on the periphery of the gun body 3, and a lower groove wall 42 is formed on the inner wall of the mounting block 4. The upper groove wall 31 and the several lower groove walls 42 combine to form a closed annular groove. Several balls 8 roll within the annular groove. The sleeve 5 is connected to several mounting blocks 4 by several first bolts. One of the mounting blocks 4 has an opening communicating with the annular groove. The opening can be closed by a second bolt. The sleeve 5 is fitted onto the outer periphery of the mounting block 4, and the sleeve 5 is fixedly connected to each mounting block 4 by the first bolts, so that... Each mounting block 4 is assembled into a complete ring structure. At the same time, the rolling of the ball bearing 8 in the annular groove enables the mounting block 4 to rotate freely relative to the end of the gun body 3. An opening is set on one of the mounting blocks 4. During assembly, the ball bearing 8 is inserted into the annular groove through the opening. After insertion, the opening is sealed with a second bolt to prevent the ball bearing 8 from falling out. When disassembly is required, the second bolt is removed and the opening is opened, allowing the ball bearing 8 to be poured out of the annular groove. Then, the first bolt is removed to separate the sleeve 5 from each mounting block 4, thus separating the mounting block 4 from the gun body 3.

[0020] like Figure 7 as well as Figure 8As shown, in order to further ensure that the sprayed powder can be uniformly injected into the plasma jet, several powder feeding parts 1 are evenly distributed around the periphery of the blow-out cavity 41. Specifically, in this embodiment, there are three powder feeding parts 1. The three powder feeding parts 1 are evenly distributed around the periphery of the blow-out cavity 41 at an angle of 120 degrees. The output end of each powder feeding part 1 faces the central region of the plasma jet. Since R is greater than M and less than N, that is, the diameter of the circle formed by the output end of the powder feeding part 1 is between the minimum diameter of the blow-out cavity 41 and the maximum diameter of the end of the gun body 3, the amount of sprayed powder output by the powder feeding part 1 injected into the periphery of the plasma jet is greater than that in the central region of the plasma jet. As a result, the accumulation thickness of molten particles in the periphery of the plasma jet is higher than that in the central region. The output ends of the three powder feeding parts 1 correspond to three independent dense regions of molten particles. As the mounting block 4 rotates, the three dense regions form three interwoven continuous paths on the material surface. like Figure 5 and Figure 6 As shown, the drive assembly 7 includes a drive gear 72, a driven gear 73, and a drive source 71. The drive source 71 is mounted on the base 2, and its output end is coaxially fixed with the drive gear 72. The drive source 71 drives the drive gear 72 to rotate. The drive gear 72 meshes with the driven gear 73, which is fixedly connected to the sleeve 5. The drive source 71 is a servo motor, and its housing is fixed to one side of the base 2. The output shaft of the servo motor passes through a through hole on the base 2 and is coaxially keyed to the drive gear 72. The drive gear 72 is located on the other side of the base 2. The driven gear 73 is sleeved on the outer periphery of the sleeve 5 and is connected to the sleeve 5 by a key or weld. When the servo motor drives the active gear 72 to rotate, the active gear 72 drives the driven gear 73 to rotate. The driven gear 73 drives the sleeve 5 and several mounting blocks 4 fixedly connected to the sleeve 5 to rotate synchronously around the axis of the blow-out cavity 41. In order to protect the active gear 72 and the driven gear 73, the drive assembly 7 also includes a protective cover 6 spliced ​​by several third bolts. The protective cover 6 covers the active gear 72 and the driven gear 73. The protective cover 6 is oblong. One side of the protective cover 6 has a through hole for the sleeve 5 to pass through, and the other side of the protective cover 6 has a through hole for the output end of the drive source 71 to pass through. The protective cover 6 is composed of two half shells spliced ​​by third bolts. The device also includes a rotating mechanism, which drives the material to rotate around the material's axis. The robotic arm 9 guides the end of the gun body 3 to move at a constant speed along the material's axis. The rotating mechanism is located on the opposite side of the gun body 3. It can use a chuck or ejector pin structure to clamp one end of the rod-shaped material and drive the material to rotate at a constant speed around its own axis. The robotic arm 9 carries the gun body 3 to move at a constant speed along the material's axis. The flaring direction of the blow-out chamber 41 is towards the direction of the plasma jet ejection at the end of the gun body 3. That is, the large opening of the blow-out chamber 41 faces the material surface, and the small opening is close to the end of the gun body 3, so that the plasma jet is sprayed towards the material in a diffused form after being guided by the flaring of the blow-out chamber 41.

[0021] Usage: Clamp the rod-shaped material to be sprayed onto the rotating mechanism. Start the rotating mechanism to make the material rotate at a constant speed around its own axis. At the same time, start the robotic arm 9 to make the end of the gun body 3 translate at a constant speed along the axis of the material. Start the gun body 3 to input plasma gas and generate a plasma jet. Simultaneously, inject the spraying powder into the plasma jet through three powder feeding parts 1. Start the drive source 71. The drive source 71 drives the sleeve 5 and the mounting block 4 to rotate at a constant speed around the axis of the blow-out chamber 41 through the drive gear 72 and the driven gear 73. The mounting block 4 drives the three powder feeding parts 1 to rotate synchronously. The spraying powder output by the three powder feeding parts 1 forms three independent dense areas of molten particles around the plasma jet. The movement path of the highest point of the accumulation thickness of each dense area follows a cycloidal trajectory with the rotation of the mounting block 4 and the rotation and translation of the material. The three cycloidal trajectories are staggered along the axis of the material and have overlapping paths, forming three interwoven spiral lines on the surface of the material. The spiral lines intersect to form a mesh coating structure.

[0022] Beneficial effects: By setting the powder feeding component 1 on the mounting block 4 and making its output end surround the plasma jet with a diameter R greater than M and less than N, the amount of molten particles on the periphery of the plasma jet is greater than that in the central area. With the mounting block 4 driving the powder feeding component 1 to rotate, the movement paths of the three independent dense areas of molten particles on the material surface are three staggered and overlapping continuous cycloids, forming a mesh-like interwoven coating structure on the surface of the rod-shaped material. The mesh structure can disperse the torsional load it bears to multiple intersecting paths, thereby effectively improving the stress distribution state on the surface of the rod-shaped material and improving the torsional fracture resistance of the thin-walled hollow tube.

[0023] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A plasma spraying device for a training target frame, characterized in that, include: The gun body (3) is fixedly mounted on the robotic arm (9) via the base (2). The gun body (3) can eject a plasma jet from its end by inputting plasma gas. The maximum diameter of the end of the gun body (3) is N. There are several powder feeding components (1), and several of the powder feeding components (1) can simultaneously inject spray powder into the plasma jet; There are several mounting blocks (4). The mounting blocks (4) are rotatably connected to the end of the gun body (3) through connectors. Several mounting blocks (4) form a blow-out cavity (41) around the extension line of the axis of the end of the gun body (3). The blow-out cavity (41) is flared and has a minimum diameter of M. The powder feeding component (1) is fixedly connected to the mounting block (4). The diameter of the circle formed by the output ends of several powder feeding components (1) is R, where R is greater than M and less than N. A drive assembly (7) is disposed on the base (2) and is used to drive a plurality of mounting blocks (4) to rotate about the axis of the blow-out cavity (41).

2. The plasma spraying device for a training target frame according to claim 1, characterized in that: The connector includes a sleeve (5) and several balls (8). An upper groove wall (31) is formed on the periphery of the gun body (3), and a lower groove wall (42) is formed on the inner wall of the mounting block (4). The upper groove wall (31) and several lower groove walls (42) are combined to form a closed annular groove. Several balls (8) roll in the annular groove. The sleeve (5) is connected to several mounting blocks (4) by several first bolts. One of the mounting blocks (4) has an opening that communicates with the annular groove. The opening can be closed by a second bolt.

3. The plasma spraying device for a training target frame according to claim 1, characterized in that: The drive assembly (7) includes a drive gear (72), a driven gear (73), and a drive source (71). The drive source (71) is mounted on the base (2). The output end of the drive source (71) is coaxially fixed with the drive gear (72). The drive source (71) is used to drive the drive gear (72) to rotate. The drive gear (72) meshes with the driven gear (73). The driven gear (73) is fixedly connected to the sleeve (5).

4. The plasma spraying device for a training target frame according to claim 3, characterized in that: The drive assembly (7) also includes a protective cover (6) assembled by a number of third bolts, which covers the drive gear (72) and the driven gear (73).

5. The plasma spraying device for a training target frame according to claim 1, characterized in that: It also includes a rotating mechanism, which drives the material to rotate around the material's axis, and the robotic arm (9) guides the end of the gun body (3) to move at a constant speed along the material's axis.

6. The plasma spraying device for a training target frame according to claim 1, characterized in that: Several powder feeding components (1) are evenly distributed around the periphery of the blowing cavity (41).

7. The plasma spraying device for a training target frame according to claim 1, characterized in that: The flare of the blow-out chamber (41) is directed toward the direction in which the plasma jet is ejected from the end of the gun body (3).

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