Spraying equipment for metal coating on surface layer of steel penetrating plug and preparation method of spraying equipment

Abstract

The invention relates to the technical field of plasma spraying, in particular to spraying equipment for a metal coating on the surface layer of a steel penetrating plug and a preparation method thereof.The spraying equipment comprises a spray head frame, the bottom end of the spray head frame is fixedly connected with an adjusting seat, the steel penetrating plug is arranged at the top end of the adjusting seat, and an annular frame is arranged on the annular side of the steel penetrating plug; a transverse positioning mechanism is arranged at the joint of the attaching adaptation assembly and the equal-distance paint spraying assembly, and the sliding spray gun mechanism keeps the vertical curvilinear motion equal distance between the sliding spray gun mechanism and the curved paint spraying face of the steel penetrating ejector head through the transverse positioning mechanism. And the lifting assembly is arranged on the inner side of the spray head frame, and the lifting assembly drives the annular frame and the equidistant paint spraying assembly to do lifting motion on the paint spraying face of the steel penetrating top head through the connecting ruler frame. Through the structural matching design of the equidistant paint spraying assembly, the spraying distance of the plasma spray gun on the surface layer of the steel penetrating plug is conveniently kept equidistant, the defect of spraying leakage or accumulation in a straight area and a high-curvature transition section is avoided, and the plasma spray gun is particularly suitable for special-shaped structures such as biconical structures and parabola structures, so that the uniformity of a spraying layer on the surface of the steel penetrating plug is conveniently kept, and the service life of the steel penetrating plug is prolonged. The preparation speed is increased, and the service life is further prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma spraying, and specifically, to a spraying device for a surface metal coating of a piercing plug and a preparation method thereof. Background Art

[0002] The piercing plug (i.e., the piercing head) is a key tool in seamless steel pipe production, mainly used for piercing and rolling high-temperature steel billets to form hollow billets. The piercing plug is installed on the piercing machine and directly participates in the deformation process of the steel billet, and is the core component determining the production efficiency and quality of the steel pipe. Since the piercing plug is usually used for piercing and rolling, for the convenience of its function, it is usually designed as a streamlined bullet cylindrical shape with a narrow upper part and a wide lower part. The early piercing plugs were made of molybdenum-based alloys, and their service life was relatively low. In order to improve its service life, the current piercing plugs are usually prepared by spraying a high-strength and high-wear-resistant nickel-chromium alloy layer (containing chromium carbide) on their surfaces, taking into account both cost and service life. However, due to the curved design of the surface of the existing piercing plugs, the complexity of the curved shape of its surface makes it difficult to maintain consistent spraying angles and distances. The limitations of traditional spraying processes are relatively high, it is difficult to plan the spray gun path, the coating thickness is uneven, which affects performance and life, and it is difficult to perform equidistant and efficient spraying preparation of the wear-resistant layer on its surface.

[0003] Based on this, the present invention discloses a spraying device for a surface metal coating of a piercing plug and a preparation method thereof. Summary of the Invention

[0004] To solve the problems in the background art that the current piercing plugs are usually prepared by spraying a high-strength and high-wear-resistant nickel-chromium alloy layer (containing chromium carbide) on their surfaces, taking into account both cost and service life. However, due to the curved design of the surface of the existing piercing plugs, the complexity of the curved shape of its surface makes it difficult to maintain consistent spraying angles and distances. The limitations of traditional spraying processes are relatively high, it is difficult to plan the spray gun path, the coating thickness is uneven, which affects performance and life, and it is difficult to perform equidistant and efficient spraying preparation of the wear-resistant layer on its surface, the present invention provides a spraying device for a surface metal coating of a piercing plug and a preparation method thereof, which includes a spray head frame, the bottom end of the spray head frame is fixedly connected with an adjustment seat, the top end of the adjustment seat is provided with a piercing plug, a circular frame is arranged on the circumferential side of the piercing plug, a connecting ruler frame is fixedly connected to the side of the circular frame close to the spray head frame, and a circular mounting seat is detachably connected to the inner circumferential side of the circular frame close to the piercing plug; The equidistant spraying component is arranged on the side of the annular frame ring. It includes a sliding spray gun mechanism and a fitting and adapting mechanism. The fitting and adapting mechanism is used to drive the sliding spray gun mechanism to move on the equidistant spraying component. A horizontal positioning mechanism is arranged at the connection between the fitting and adapting component and the equidistant spraying component. The sliding spray gun mechanism maintains an equidistant vertical curve movement with the curved spraying surface of the steel-piercing head through the horizontal positioning mechanism. The lifting component is arranged inside the nozzle frame. The lifting component drives the annular frame and the equidistant spraying component to perform lifting movements on the spraying surface of the steel-piercing head through the connecting ruler frame.

[0005] As a further improvement of this technical solution, the equidistant spraying component includes an annular rack, a spraying seat, a transmission column, a transmission gear, a first servo motor, and a balance wheel. An annular rack is fixedly connected to the inner side of the bottom end of the annular frame. A spraying seat is slidably connected to the outer side of one end of the annular frame. A transmission column is rotatably connected to the central position inside the spraying seat. The bottom end of the transmission column extends to a position corresponding to the annular rack. A transmission gear is fixedly connected to the ring side of the bottom end of the transmission column. The transmission gear is meshed with the annular rack. A first servo motor is fixedly connected to the central position of the top end of the spraying seat. The output end of the first servo motor is fixedly connected to the transmission column. Balance wheels are rotatably connected to both sides inside the spraying seat. Guide grooves are formed in the inner sides of the top ends of the annular frame and the annular mounting seat. The bottom ends of the balance wheels are located inside the guide grooves and are slidably connected thereto.

[0006] As a further improvement of this technical solution, the sliding spray gun mechanism includes a moving cross beam, a sliding cross seat, and a sliding seat. Moving cross beams are fixedly connected to both sides of the top end of the spraying seat. A sliding cross seat is slidably connected to the inside of the moving cross beam. A sliding seat is fixedly connected to the top end of the sliding cross seat.

[0007] As a further improvement of this technical solution, the sliding spray gun mechanism further includes a plasma spray gun, a plasma nozzle, and an input pipe seat. A plasma spray gun is fixedly connected to the top end of the sliding seat. A plasma nozzle is fixedly connected to the end of the plasma spray gun close to the steel-piercing head. An input pipe seat is fixedly connected to the end of the plasma spray gun far from the steel-piercing head.

[0008] As a further improvement of the present technical solution, the fitting and adapting mechanism includes an equidistant frame, a horizontal column, a rotating hollow column, a sliding column, a connecting frame and a fitting wheel. The end of the spraying seat far from the steel-piercing plug is fixedly connected with an equidistant frame. The inner side of the equidistant frame close to the bottom end of the steel-piercing plug is fixedly connected with a horizontal column. The inner side of the horizontal column is rotatably connected with a rotating hollow column. The inner side of the rotating hollow column is slidably connected with a sliding column. The end of the sliding column far from the steel-piercing plug is in contact with the equidistant frame. The end of the sliding column close to the steel-piercing plug is fixedly connected with a connecting frame. The inner side of the connecting frame is rotatably connected with a fitting wheel. The fitting wheel is in contact with the painting surface of the steel-piercing plug. The end of the sliding seat far from the steel-piercing plug is rotatably connected with the equidistant frame.

[0009] As a further improvement of the present technical solution, the fitting and adapting mechanism further includes a limiting ring, a top-contact spring and a limiting block. The inner side of the rotating hollow column is slidably connected with a limiting ring. The limiting ring is fixedly connected with the sliding column. Four limiting sliding grooves are axially formed on the circumferential side of the rotating hollow column. The inner side of the limiting sliding groove is slidably connected with a limiting block. The limiting block is fixedly connected with the limiting ring. A top-contact spring is sleeved on the circumferential side of the sliding column inside the rotating hollow column. One end of the top-contact spring is fixedly connected with the rotating hollow column, and the other end of the top-contact spring is fixedly connected with the limiting ring.

[0010] As a further improvement of the present technical solution, the horizontal positioning mechanism includes a horizontal seat, an adjusting gear, a horizontal gear and a second servo motor. The end of the rotating hollow column close to the equidistant frame is fixedly connected with a horizontal seat. The inner side of the horizontal seat is in contact with the sliding column. The outer side of the horizontal seat is fixedly connected with an adjusting gear. A horizontal gear is rotatably connected at a position corresponding to the adjusting gear inside the equidistant frame. The horizontal gear is meshed with the adjusting gear. A second servo motor is fixedly connected at a position corresponding to the horizontal gear inside the equidistant frame. The output end of the second servo motor is fixedly connected with the horizontal gear.

[0011] As a further improvement of the present technical solution, the inner side of the adjusting seat is rotatably connected with an operating table. A plurality of clamping frames are arranged inside the operating table. The clamping frames are clamped and connected with the steel-piercing plug. A rotating gear is fixedly connected on the circumferential side of the operating table inside the adjusting seat. A third servo motor is fixedly connected at a position corresponding to the operating table inside the adjusting seat. The output end of the third servo motor is fixedly connected with a connecting gear. The connecting gear is meshed with the rotating gear.

[0012] As a further improvement of the technical solution, a plasma spraying box is fixedly connected to the bottom end of the spray head frame and on the side far away from the adjusting seat. One end of the plasma spraying box is fixedly connected with a plasma spraying operation body. One end of the bottom end of the spray head frame is fixedly connected with a vertical ring frame. An input hose is arranged inside the vertical ring frame. The bottom end of the input hose is inserted and connected with the plasma spraying operation body, and the top end of the input hose is inserted and connected with an input pipe seat.

[0013] As a further improvement of the technical solution, the lifting assembly includes a lifting seat, a hydraulic cylinder, a hydraulic column, a first stabilizing column, a stabilizing frame and a second stabilizing column. The center inside the top end of the spray head frame is fixedly connected with a lifting seat. A hydraulic cylinder is fixedly connected inside the lifting seat. A hydraulic column is arranged inside the hydraulic cylinder. The bottom end of the hydraulic column is fixedly connected with a connecting ruler frame. Both ends of the connecting ruler frame are slidably connected with a first stabilizing column, and the first stabilizing column is fixedly connected with the spray head frame. A plurality of stabilizing frames are fixedly connected to the end of the connecting ruler frame far away from the annular frame. A second stabilizing column is slidably connected inside the stabilizing frame, and the second stabilizing column is fixedly connected with the spray head frame.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the spraying equipment and its preparation method for the surface metal coating of the steel piercing plug, through the structural cooperation design of the equidistant spraying component, it is convenient to keep the distance between the plasma spray gun and the surface of the steel piercing plug equidistant. The molten particles impact the curved surface at a high speed of 180–480m / s and then spread evenly. The coating thickness deviation rate can be controlled within ±5%, which is significantly better than traditional manual spraying. It avoids missing spraying or accumulation defects in the flat area and the high-curvature transition section, and is especially suitable for special-shaped structures such as double-conical and parabolic shapes. Furthermore, it is convenient to keep the spray coating on the surface of the steel piercing plug uniform, improve its preparation speed, and further improve its service life.

[0015] 2. In the spraying equipment and its preparation method for the surface metal coating of the steel piercing plug, through the structural cooperation design of the horizontal positioning mechanism, after the equidistant component is adjusted to a suitable distance on the steel piercing plug, the horizontal positioning mechanism is started to drive the connecting frame and the fitting wheel to adjust from horizontal to vertical on the steel piercing plug. Then, it is convenient to drive the adjustment of the plasma spray gun to perform circular spraying on the steel piercing plug. Combined with the automated production line design, the circular spraying efficiency is significantly improved compared with the traditional linear spraying efficiency. It improves the effect of uniform deposition of atomized particles in different curvature regions, avoids missing spraying or accumulation, improves the preparation efficiency of the industrial-scale production of this equipment, further improves the coating adhesion of the surface of the steel piercing plug, and improves the service life of the steel piercing plug.

[0016] 3. In the spraying equipment for the surface metal coating of the steel piercing plug and its preparation method, through the structural cooperation design of the vertical ring frame and the input hose, when the plasma spray gun performs equidistant annular spraying on the steel piercing plug, the vertical ring frame reduces the contact between the input hose and the sprayed coating on the surface of the steel piercing plug, improves the service life of the input hose while reducing the impact on the sprayed coating, further improves the efficiency of the device for industrial mass production, reduces the risk of wear of small parts during the production of the device, reduces the production cost, and increases the enterprise profit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the whole invention; Figure 2 is a schematic structural diagram of the connecting ruler frame and the annular frame of the invention; Figure 3 is a schematic structural diagram of the annular mounting seat and the annular rack of the invention; Figure 4 is a schematic structural diagram of the equidistant paint spraying assembly of the invention; Figure 5 is a schematic structural diagram of the annular frame and the annular mounting seat of the invention; Figure 6 is a schematic structural diagram of the balance wheel and the guide groove of the invention; Figure 7 is a schematic structural diagram of the fitting and adapting mechanism of the invention; Figure 8 is a schematic structural diagram of the horizontal positioning mechanism of the invention; Figure 9 is a schematic structural diagram of the lifting seat and the hydraulic cylinder of the invention; Figure 10 is a schematic structural diagram of the 4 and the second stabilizing column of the invention; Figure 11 is a schematic structural diagram of the input hose of the invention; Figure 12 is a schematic sectional view of the adjusting seat of the invention.

[0018] The meanings of the various reference numerals in the figure are as follows: 1. Spray head frame; 2. Adjusting seat; 3. Steel piercing head; 4. Connecting ruler frame; 5. Ring frame; 6. Ring mounting seat; 7. Ring rack; 8. Spraying seat; 9. Driving column; 10. Driving gear; 11. First servo motor; 12. Balance wheel; 13. Moving cross beam; 14. Sliding cross seat; 15. Sliding seat; 16. Plasma spray gun; 17. Plasma spray head; 18. Input pipe seat; 19. Equidistant frame; 20. Horizontal column; 21. Rotating hollow column; 22. Sliding column; 23. Connecting frame; 24. Fitting wheel; 25. Limiting ring; 26. Top spring; 27. Limiting block; 28. Horizontal seat; 29. Adjusting gear; 30. Horizontal gear; 31. Second servo motor; 32. Operating platform; 33. Clamping frame; 34. Rotating gear; 35. Third servo motor; 36. Connecting gear; 37. Plasma spraying box; 38. Plasma spraying operation body; 39. Vertical ring frame; 40. Input hose; 41. Lifting seat; 42. Hydraulic cylinder; 43. Hydraulic column; 44. First stabilizing column; 45. Stabilizing frame; 46. Second stabilizing column. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0020] Therefore, the present invention provides a spraying device for the surface metal coating of a steel piercing head and its preparation method: Example 1, as Figures 1 - 12 shown, it includes a spray head frame 1. The bottom end of the spray head frame 1 is fixedly connected with an adjusting seat 2, which facilitates the support of the device through the spray head frame 1. The top end of the adjusting seat 2 is provided with a steel piercing head 3. In order to facilitate the plasma spraying of the steel piercing head 3, a ring frame 5 is arranged on the ring side of the steel piercing head 3. One side of the ring frame 5 close to the spray head frame 1 is fixedly connected with a connecting ruler frame 4. The inner ring side of the ring frame 5 close to the steel piercing head 3 is detachably connected with a ring mounting seat 6, which facilitates the installation and disassembly of the mechanism parts on the ring frame 5 through the ring mounting seat 6; Equidistant spraying assembly, arranged at the ring side position of the ring frame 5, which includes a sliding spray gun mechanism and a fitting adaptation mechanism. The fitting adaptation mechanism is used to drive the sliding spray gun mechanism to move on the equidistant spraying assembly. A horizontal positioning mechanism is arranged at the connection between the fitting adaptation assembly and the equidistant spraying assembly. The sliding spray gun mechanism maintains an equidistant vertical curve movement with the curved spraying surface of the steel piercing head 3 through the horizontal positioning mechanism; The lifting assembly is arranged inside the spray head frame 1. The lifting assembly drives the annular frame 5 and the equidistant spray painting assembly to move up and down on the spray painting surface of the steel-piercing head 3 through the connecting ruler frame 4, thereby facilitating the vertical spray painting operation of the steel-piercing head 3.

[0021] The equidistant spray painting assembly includes an annular rack 7, a spraying seat 8, a transmission column 9, a transmission gear 10, a first servo motor 11 and a balance wheel 12. The inner side of the bottom end of the annular frame 5 is fixedly connected with the annular rack 7. The outer side of one end of the annular frame 5 is slidably connected with the spraying seat 8. In order to facilitate driving the spraying seat 8 to move on the annular frame 5 and the annular mounting seat 6, the center position of the inner side of the spraying seat 8 is rotatably connected with the transmission column 9. The bottom end of the transmission column 9 extends to a position corresponding to the annular rack 7. The annular side of the bottom end of the transmission column 9 is fixedly connected with the transmission gear 10. The transmission gear 10 is meshed and connected with the annular rack 7. In order to facilitate driving the annular rack 7 to rotate, the center position of the top end of the spraying seat 8 is fixedly connected with the first servo motor 11. The output end of the first servo motor 11 is fixedly connected with the transmission column 9. In order to maintain the stability and balance when the spraying seat 8 moves, both sides of the inner side of the spraying seat 8 are rotatably connected with the balance wheel 12. Guide grooves are formed in the inner sides of the top ends of the annular frame 5 and the annular mounting seat 6. The bottom end of the balance wheel 12 is located inside the guide groove and is slidably connected with it.

[0022] The sliding spray gun mechanism includes a moving cross beam 13, a sliding cross seat 14 and a sliding seat 15. Both sides of the top end of the spraying seat 8 are fixedly connected with the moving cross beam 13. The inner side of the moving cross beam 13 is slidably connected with the sliding cross seat 14. The top end of the sliding cross seat 14 is fixedly connected with the sliding seat 15.

[0023] The sliding spray gun mechanism further includes a plasma spray gun 16, a plasma spray head 17 and an input pipe seat 18. The top end of the sliding seat 15 is fixedly connected with the plasma spray gun 16. The end of the plasma spray gun 16 close to the steel-piercing head 3 is fixedly connected with the plasma spray head 17. The end of the plasma spray gun 16 far from the steel-piercing head 3 is fixedly connected with the input pipe seat 18, thereby facilitating the movement of the plasma spray gun 16 on the spraying seat 8.

[0024] To facilitate driving the plasma spray gun 16 and the plasma spray head 17 to maintain an equal distance from the surface of the steel piercing plug 3 and fit and adapt to it, the fitting and adapting mechanism includes an equal-distance frame 19, a horizontally arranged column 20, a rotating hollow column 21, a sliding column 22, a connecting frame 23 and a fitting wheel 24. The end of the spraying seat 8 far from the steel piercing plug 3 is fixedly connected with the equal-distance frame 19. The inner side of the equal-distance frame 19 close to the bottom end of the steel piercing plug 3 is fixedly connected with the horizontally arranged column 20. The inner side of the horizontally arranged column 20 is rotatably connected with the rotating hollow column 21. To facilitate the sliding column 22 to move and adjust the distance along with the surface of the steel piercing plug 3, the inner side of the rotating hollow column 21 is slidably connected with the sliding column 22. The end of the sliding column 22 far from the steel piercing plug 3 is in contact with the equal-distance frame 19. The end of the sliding column 22 close to the steel piercing plug 3 is fixedly connected with the connecting frame 23. The inner side of the connecting frame 23 is rotatably connected with the fitting wheel 24. The fitting wheel 24 is in contact with the spraying surface of the steel piercing plug 3. The end of the sliding seat 15 far from the steel piercing plug 3 is rotatably connected with the equal-distance frame 19. Thus, it is convenient to drive the plasma spray gun 16 to move simultaneously with the sliding column 22 by moving the cross beam 13.

[0025] The fitting and adapting mechanism further includes a limiting ring 25, a top-contact spring 26 and a limiting block 27. The inner side of the rotating hollow column 21 is slidably connected with the limiting ring 25. The limiting ring 25 is fixedly connected with the sliding column 22. To facilitate the sliding column 22 to make a linear movement in the rotating hollow column 21, four limiting sliding grooves are axially formed on the circumferential side of the rotating hollow column 21. To facilitate the fitting wheel 24 to fit with the surface of the steel piercing plug 3, the inner side of the limiting sliding groove is slidably connected with the limiting block 27. The limiting block 27 is fixedly connected with the limiting ring 25. A top-contact spring 26 is sleeved on the circumferential side of the sliding column 22 located inside the rotating hollow column 21. One end of the top-contact spring 26 is fixedly connected with the rotating hollow column 21, and the other end of the top-contact spring 26 is fixedly connected with the limiting ring 25.

[0026] During operation, the operating steps of a method for preparing a surface metal coating for a steel piercing plug are as follows. When spraying the surface curve of the steel piercing plug 3, when the annular frame 5 moves outward and approaches the adjusting seat 2 in the direction of the steel piercing plug 3, since the circumference of the steel piercing plug 3 in the direction approaching the adjusting seat 2 is larger than the circumference in the direction away from the adjusting seat 2, when the annular frame 5 moves, the movement of the fitting wheel 24 conveniently drives the sliding column 22 to move away from the center of the steel piercing plug 3. Then, the fitting wheel 24 drives the sliding column 22 and the equidistant frame 19 to move away from the center of the steel piercing plug 3 simultaneously. Then, the equidistant frame 19 drives the plasma spray gun 16 to move away from the center of the steel piercing plug 3 simultaneously with the sliding seat 15 and the sliding cross-seat 14 as the reference. Thus, the distance between the plasma nozzle 17 and most parts of the surface curve of the steel piercing plug 3 is always kept equidistant, so that the molten particles sprayed hit the curve at a high speed of 180–480 m / s through the input pipe seat and spread evenly. The coating thickness deviation rate can be controlled within ±5%, which is significantly better than traditional manual spraying, avoiding spraying omission or accumulation defects in the flat area and the high-curvature transition section. It is especially suitable for special-shaped structures such as double-conical and parabolic shapes. Thus, it is convenient to keep the spray coating on the surface of the steel piercing plug uniform, improve its preparation speed, and further improve its service life.

[0027] Example 2, as Figures 1 - 12 shown, to facilitate the circular motion of the plasma spray gun 16 around its center on the annular frame 5, the horizontal positioning mechanism includes a horizontal seat 28, an adjusting gear 29, a horizontal gear 30, and a second servo motor 31. To facilitate driving the fitting wheel 24 to rotate around the center point of the sliding column 22, a horizontal seat 28 is fixedly connected to the end of the rotating hollow column 21 close to the equidistant frame 19. To facilitate driving the rotating hollow column 21 to rotate within the horizontal column 20, the inner side of the horizontal seat 28 is in contact with the sliding column 22. An adjusting gear 29 is fixedly connected to the outer side of the horizontal seat 28. A horizontal gear 30 is rotatably connected to a position corresponding to the adjusting gear 29 inside the equidistant frame 19. To facilitate driving the horizontal seat 28 and the adjusting gear 29 to rotate, the horizontal gear 30 is meshed with the adjusting gear 29. A second servo motor 31 is fixedly connected to a position corresponding to the horizontal gear 30 inside the equidistant frame 19, and the output end of the second servo motor 31 is fixedly connected to the horizontal gear 30.

[0028] During operation, the operating steps of a method for preparing a surface metal coating of a piercing plug are as follows. After spraying is completed at some positions on the piercing plug 3 and the plasma spray gun 16 is driven to a suitable position, by starting the second servo motor 31, the output end of the second servo motor 31 drives the horizontal gear 30 to rotate, so that the horizontal gear 30 drives the adjusting gear 29 and the horizontal seat 28 to rotate. Then, the horizontal seat 28 drives the sliding column 22 and the fitting wheel 24 to rotate from the horizontal position to the vertical position, which facilitates driving the adjusting plasma spray gun 16 to perform circular spraying on the piercing plug 3. Combining with the automated production line design, the circular spraying efficiency is significantly improved compared with the traditional linear spraying efficiency, improving the effect of uniform deposition of atomized particles in different curvature regions, avoiding missed spraying or accumulation, improving the preparation efficiency of industrial-scale production of this equipment, further improving the coating adhesion on the surface of the piercing plug 3, and extending the service life of the piercing plug 3.

[0029] After the position of the fitting wheel 24 is adjusted, by starting the first servo motor 11, the output end of the first servo motor 11 drives the transmission gear 10 to rotate. Then, the transmission gear 10 drives the plasma spray gun 16 and the plasma spray head 17 to rotate around the center point of the circular frame 5 through the circular rack 7, so that it rotates to the position of the connecting ruler frame 4, and sprays a certain distance on the surface of the piercing plug 3.

[0030] Example 3, as Figures 1 - 12 shown, in order to facilitate clamping of the piercing plug 3, since the inside of the piercing plug 3 is semi-hollow, it is fixed by an existing supporting fixture. The inner side of the adjusting seat 2 is rotatably connected with an operating table 32. A plurality of clamping frames 33 are arranged inside the operating table 32. The clamping frames 33 are clamped and connected with the piercing plug 3. In order to facilitate driving the piercing plug 3 to rotate to assist in spraying, a rotating gear 34 is fixedly connected to the inner ring side of the adjusting seat 2 where the operating table 32 is located. A third servo motor 35 is fixedly connected to the position inside the adjusting seat 2 corresponding to the operating table 32. The output end of the third servo motor 35 is fixedly connected with a connecting gear 36. The connecting gear 36 is meshed with the rotating gear 34.

[0031] During operation, the operating steps of a method for preparing a surface metal coating of a piercing plug are as follows. After circular spraying is completed on half of the surface of the piercing plug 3 by the plasma spray gun 16 and the plasma spray head 17, by starting the third servo motor 35, the output end of the third servo motor 35 drives the connecting gear 36 to rotate. Then, the connecting gear 36 drives the connected piercing plug 3 to adjust the spraying angle through the rotating gear 34, so that the remaining parts of the surface of the piercing plug 3 are sprayed through rotation.

[0032] Example 4, as Figures 1 - 12As shown in the figure, in order to facilitate the transportation of the spraying particulate raw materials into the sliding seat 15, a plasma spraying box 37 is fixedly connected to the bottom end of the spray head frame 1 and on the side far away from the adjusting seat 2. One end of the plasma spraying box 37 is fixedly connected to a plasma spraying operation body 38. One end of the bottom end of the spray head frame 1 is fixedly connected to a vertical ring frame 39. An input hose 40 is arranged inside the vertical ring frame 39. The bottom end of the input hose 40 is plugged and connected to the plasma spraying operation body 38, and the top end of the input hose 40 is plugged and connected to the input pipe seat 18.

[0033] In order to facilitate driving the ring frame 5 and the sliding seat 15 to lift and lower, so as to complete the spraying on the surface layer of the piercing plug 3, the lifting and lowering assembly includes a lifting seat 41, a hydraulic cylinder 42, a hydraulic column 43, a first stabilizing column 44, a stabilizing frame 45 and a second stabilizing column 46. The center inside the top end of the spray head frame 1 is fixedly connected to the lifting seat 41. The inside of the lifting seat 41 is fixedly connected to the hydraulic cylinder 42. In order to maintain the stability of the ring frame 5 during lifting and lowering, a hydraulic column 43 is arranged inside the hydraulic cylinder 42. The bottom end of the hydraulic column 43 is fixedly connected to the connecting ruler frame 4. Both ends of the connecting ruler frame 4 are slidably connected to the first stabilizing column 44, and the first stabilizing column 44 is fixedly connected to the spray head frame 1. A plurality of stabilizing frames 45 are fixedly connected to the end of the connecting ruler frame 4 far away from the ring frame 5. The inside of the stabilizing frame 45 is slidably connected to the second stabilizing column 46, and the second stabilizing column 46 is fixedly connected to the spray head frame 1.

[0034] During operation, the operating steps of a method for preparing a metal coating on the surface layer of a piercing plug are as follows. After a certain distance of spraying is completed on the surface layer of the piercing plug 3, by starting the hydraulic cylinder 42, the hydraulic cylinder 42 drives the hydraulic column 43 inside it to drive the connecting ruler frame 4, the ring frame 5 and the plasma spray gun 16 connected thereto to lift and move, thereby facilitating the spraying of the entire surface layer of the piercing plug 3.

[0035] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spraying device for a surface metal coating of a steel plug and a preparation method thereof, which includes a spray head frame (1), and is characterized in that: The bottom end of the nozzle holder (1) is fixedly connected with an adjusting seat (2). The top end of the adjusting seat (2) is provided with a steel-piercing top head (3). An annular frame (5) is arranged on the circumferential side of the steel-piercing top head (3). One side of the annular frame (5) close to the nozzle holder (1) is fixedly connected with a connecting ruler frame (4). The inner circumferential side of the annular frame (5) close to the steel-piercing top head (3) is detachably connected with an annular mounting seat (6). An equidistant spraying component is arranged at the circumferential side position of the annular frame (5). It includes a sliding spray gun mechanism and a fitting and adapting mechanism. The fitting and adapting mechanism is used to drive the sliding spray gun mechanism to move on the equidistant spraying component. A horizontal positioning mechanism is arranged at the connection between the fitting and adapting component and the equidistant spraying component. The sliding spray gun mechanism maintains an equidistant vertical curve movement with the curved spraying surface of the steel-piercing top head (3) through the horizontal positioning mechanism. A lifting component is arranged inside the nozzle holder (1). The lifting component drives the annular frame (5) and the equidistant spraying component to make a lifting movement on the spraying surface of the steel-piercing top head (3) through the connecting ruler frame (4).

2. The spraying device for the surface metal coating of a piercing plug and its preparation method according to claim 1, characterized in that: The equidistant spraying component includes an annular rack (7), a spraying seat (8), a transmission column (9), a transmission gear (10), a first servo motor (11) and a balance wheel (12). The inner side of the bottom end of the annular frame (5) is fixedly connected with the annular rack (7). The outer side of one end of the annular frame (5) is slidably connected with the spraying seat (8). The center position inside the spraying seat (8) is rotatably connected with the transmission column (9). The bottom end of the transmission column (9) extends to a position corresponding to the annular rack (7). The circumferential side of the bottom end of the transmission column (9) is fixedly connected with the transmission gear (10). The transmission gear (10) is meshed and connected with the annular rack (7). The center position of the top end of the spraying seat (8) is fixedly connected with the first servo motor (11). The output end of the first servo motor (11) is fixedly connected with the transmission column (9). Both sides inside the spraying seat (8) are rotatably connected with balance wheels (12). Guide grooves are formed in the inner sides of the top ends of the annular frame (5) and the annular mounting seat (6). The bottom ends of the balance wheels (12) are located inside the guide grooves and are slidably connected with them.

3. The spraying equipment and its preparation method for the surface metal coating of a steel piercing plug according to claim 2, characterized in that: The sliding spray gun mechanism includes a moving cross beam (13), a sliding cross seat (14) and a sliding seat (15). Both sides of the top end of the spraying seat (8) are fixedly connected with the moving cross beam (13). The inner side of the moving cross beam (13) is slidably connected with the sliding cross seat (14). The top end of the sliding cross seat (14) is fixedly connected with the sliding seat (15).

4. A spraying device for a surface metal coating of a piercing plug and a preparation method thereof according to claim 3, characterized in that: The sliding spray gun mechanism further includes a plasma spray gun (16), a plasma spray head (17) and an input pipe seat (18). The top end of the sliding seat (15) is fixedly connected with the plasma spray gun (16). The end of the plasma spray gun (16) close to the steel-piercing top head (3) is fixedly connected with the plasma spray head (17). The end of the plasma spray gun (16) far from the steel-piercing top head (3) is fixedly connected with the input pipe seat (18).

5. The spraying equipment for the surface metal coating of a piercing plug and its preparation method according to claim 4, characterized in that: The fitting and adapting mechanism includes an equidistant frame (19), a horizontal column (20), a rotating hollow column (21), a sliding column (22), a connecting frame (23) and a fitting wheel (24). An equidistant frame (19) is fixedly connected to the end of the spraying seat (8) away from the steel-piercing plug (3). A horizontal column (20) is fixedly connected to the inner side of the equidistant frame (19) close to the bottom end of the steel-piercing plug (3). A rotating hollow column (21) is rotatably connected to the inner side of the horizontal column (20). A sliding column (22) is slidably connected to the inner side of the rotating hollow column (21). The end of the sliding column (22) away from the steel-piercing plug (3) is in contact with the equidistant frame (19). A connecting frame (23) is fixedly connected to the end of the sliding column (22) close to the steel-piercing plug (3). A fitting wheel (24) is rotatably connected to the inner side of the connecting frame (23). The fitting wheel (24) is in contact with the painting surface of the steel-piercing plug (3). The end of the sliding seat (15) away from the steel-piercing plug (3) is rotatably connected to the equidistant frame (19).

6. The spraying equipment for the surface metal coating of a steel piercing plug according to claim 5 and its preparation method are characterized in that: The fitting and adapting mechanism further includes a limiting ring (25), a top-contact spring (26) and a limiting block (27). A limiting ring (25) is slidably connected to the inner side of the rotating hollow column (21). The limiting ring (25) is fixedly connected to the sliding column (22). Four limiting sliding grooves are axially formed on the circumferential side of the rotating hollow column (21). A limiting block (27) is slidably connected to the inner side of the limiting sliding groove. The limiting block (27) is fixedly connected to the limiting ring (25). A top-contact spring (26) is sleeved on the circumferential side of the sliding column (22) inside the rotating hollow column (21). One end of the top-contact spring (26) is fixedly connected to the rotating hollow column (21), and the other end of the top-contact spring (26) is fixedly connected to the limiting ring (25).

7. A spraying device for a surface metal coating of a piercing plug and a preparation method thereof according to claim 6, characterized in that: The horizontal positioning mechanism includes a horizontal seat (28), an adjusting gear (29), a horizontal gear (30) and a second servo motor (31). A horizontal seat (28) is fixedly connected to the end of the rotating hollow column (21) close to the equidistant frame (19). The inner side of the horizontal seat (28) is in contact with the sliding column (22). An adjusting gear (29) is fixedly connected to the outer side of the horizontal seat (28). A horizontal gear (30) is rotatably connected to the position corresponding to the adjusting gear (29) inside the equidistant frame (19). The horizontal gear (30) is meshed with the adjusting gear (29). A second servo motor (31) is fixedly connected to the position corresponding to the horizontal gear (30) inside the equidistant frame (19). The output end of the second servo motor (31) is fixedly connected to the horizontal gear (30).

8. A spraying device for the surface metal coating of a piercing plug and its preparation method according to claim 1, characterized in that: The inner side of the adjusting seat (2) is rotatably connected with an operating table (32). A plurality of clamping frames (33) are arranged inside the operating table (32). The clamping frames (33) are clamped and connected with the steel piercing plug (3). A rotating gear (34) is fixedly connected to the annular side of the operating table (32) located inside the adjusting seat (2). A third servo motor (35) is fixedly connected to the position inside the adjusting seat (2) corresponding to the operating table (32). The output end of the third servo motor (35) is fixedly connected with a connecting gear (36). The connecting gear (36) is meshed with the rotating gear (34).

9. A spraying device for the surface metal coating of a steel piercing plug and a preparation method thereof according to claim 4, characterized in that: One side of the bottom end of the spray head frame (1) far away from the adjusting seat (2) is fixedly connected with a plasma spraying box (37). One end of the plasma spraying box (37) is fixedly connected with a plasma spraying operating body (38). One end of the bottom end of the spray head frame (1) is fixedly connected with a vertical ring frame (39). An input hose (40) is arranged inside the vertical ring frame (39). The bottom end of the input hose (40) is inserted and connected with the plasma spraying operating body (38). The top end of the input hose (40) is inserted and connected with the input pipe seat (18).

10. A spraying device for the surface metal coating of a steel piercing plug and its preparation method according to claim 9, characterized in that: The lifting assembly includes a lifting seat (41), a hydraulic cylinder (42), a hydraulic column (43), a first stabilizing column (44), a stabilizing frame (45) and a second stabilizing column (46). The center inner side of the top end of the spray head frame (1) is fixedly connected with a lifting seat (41). A hydraulic cylinder (42) is fixedly connected to the inside of the lifting seat (41). A hydraulic column (43) is arranged inside the hydraulic cylinder (42). The bottom end of the hydraulic column (43) is fixedly connected with a connecting ruler frame (4). The two ends of the connecting ruler frame (4) are both slidably connected with a first stabilizing column (44). The first stabilizing column (44) is fixedly connected with the spray head frame (1). A plurality of stabilizing frames (45) are fixedly connected to the end of the connecting ruler frame (4) far away from the annular frame (5). The inside of the stabilizing frame (45) is slidably connected with a second stabilizing column (46). The second stabilizing column (46) is fixedly connected with the spray head frame (1).

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