HVOF processing apparatus

Abstract

The application discloses a kind of supersonic flame spraying processing equipment, including installation base, the workbench is rotatably installed on the installation base, the workbench is annularly equipped with several installation stations, the installation station is equipped with positioning tooling, the workbench outside is equipped with several spraying robots, and the spraying robot execution end is fixedly assembled supersonic flame spraying nozzle;Workpiece is fixed and positioned by positioning tooling on the workbench, and when it is rotated and transported to the nozzle corresponding spraying station, the spraying robot drives the supersonic flame spraying nozzle to carry out flame spraying operation on the workpiece, and after spraying is completed, the workbench continues to index rotation, and the workpiece is transported to the next cooling station.The present application cooperates with multiple spraying robots through carousel workbench to work collaboratively, without disassembling and transporting workpiece, multiple coating alternate spraying processing can be completed, which greatly improves the continuity of workpiece spraying processing, production efficiency and product quality consistency.

Description

Technical Field

[0001] This invention relates to the field of surface treatment technology, and in particular to supersonic flame spraying equipment. Background Technology

[0002] Supersonic flame spraying, with its advantages of dense coating, high bonding strength, and excellent wear and corrosion resistance, has become the mainstream processing technology for surface strengthening of the ball sealing surface of hard-seal ball valves. It is widely used in the production and processing of high-pressure wear-resistant ball valve parts in petrochemical, coal chemical and other fields.

[0003] Patent CN120460186B relies on a clamp to hold the edge of the ball valve body for positioning. However, the clamping area is completely covered and blocked by the clamp, preventing the spray gun's flame from reaching the clamped and covered position. This results in a blank area on the sealing surface of the ball valve clamping edge, where there is no wear-resistant protective coating. Subsequent manual re-spraying and repair are required, making the processing steps cumbersome. Patent CN118835191B uses a fixed installation structure for the spray head and tooling, making it impossible to replace the spray head independently and quickly. When the workpiece needs to be sprayed with different types of wear-resistant coatings, the equipment cannot complete the spraying switch at the same station. The entire workpiece must be disassembled and transferred to the spraying station matching the corresponding coating for processing. This changeover process is cumbersome and time-consuming, significantly reducing the continuity and production efficiency of workpiece spraying. At the same time, multiple disassembly and reassembly can easily cause deviations in workpiece positioning accuracy, affecting the consistency of coating quality. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art by proposing a supersonic flame spraying treatment device that can solve the above problems.

[0005] To achieve the above objectives, this invention proposes a supersonic flame spraying treatment device, including a mounting base on which a worktable is rotatably mounted. Several installation stations are arranged around the worktable, and positioning fixtures are provided at each installation station. Several spraying robots are arranged outside the worktable, and supersonic flame spraying nozzles are fixedly mounted on the execution ends of the spraying robots. After the workpiece is fixedly positioned by the positioning fixtures on the worktable, it is transported to the corresponding spraying station as the worktable rotates. The spraying robot drives the supersonic flame spraying nozzle to align with the workpiece and perform flame spraying. After spraying, the worktable continues to rotate, and the workpiece is transported to the next cooling station for cooling treatment. After cooling, it enters the next spraying station.

[0006] Preferably, the positioning fixture includes two symmetrically arranged upright plates, which are slidably installed on both sides of the installation position. The two upright plates are connected to a driving mechanism, and the two upright plates move towards or away from each other under the drive of the driving mechanism. A fixed rod is rotatably installed on the upright plate, and a telescopic rod is slidably installed on the fixed rod. The fixed rod and the telescopic rod are circumferentially fixed. A fixed ring is fixedly provided on the outer side of the fixed rod. A plurality of first connecting rods are provided on the fixed ring. A movable ring is fixedly provided at the end of the telescopic rod away from the fixed rod. A plurality of second connecting rods are provided on the movable ring. One end of the first connecting rod is hinged to the fixed ring, and the other end is hinged to one end of the second connecting rod. The other end of the second connecting rod is hinged to the movable ring. A positioning block is installed at the hinge of the first connecting rod and the second connecting rod.

[0007] Preferably, a return spring is provided between the fixed ring and the moving ring. In its natural state, the return spring keeps the fixed ring and the moving ring at a certain distance, and the positioning block at the hinge is in an inwardly contracted state. When the moving ring is squeezed by an external force, the distance between the fixed ring and the moving ring is compressed, and the positioning block at the hinge expands radially.

[0008] Preferably, the workbench is provided with a slide groove, the upright plate is slidably installed in the slide groove, a drive gear is rotatably installed under the workbench, the bottom of the two upright plates are respectively connected to an upper rack and a lower rack, the two sides of the drive gear are meshed with the upper rack and the lower rack, and the drive gear is driven to rotate by a moving motor.

[0009] Preferably, a rotating shaft is rotatably mounted below the worktable, and sliding rods are slidably mounted on both sides of the rotating shaft. The sliding rods are circumferentially fixed to the rotating shaft. The end of the fixed rod away from the telescopic rod is connected to a transmission rod through a first bevel gear set. The transmission rod is connected to the sliding rod through a second bevel gear set. The rotating shaft is driven to rotate by a rotating motor.

[0010] Preferably, a worm gear is installed in the middle of the rotating shaft, the worm gear meshes with a worm, and the worm is driven by a rotating motor.

[0011] Preferably, the outer side of the upright plate is provided with a transmission housing, and the transmission rod, the first bevel gear set and the second bevel gear set are all installed in the transmission housing.

[0012] The beneficial effects of the present invention are as follows: The present invention uses a rotary worktable in conjunction with multiple sets of spraying robots to work together, and can complete the alternating spraying of multiple coatings without disassembling and transferring workpieces, which greatly improves the continuity of workpiece spraying, production efficiency and consistency of finished product quality. After the positioning fixture completes the docking through the relative movement of the vertical plate, it squeezes the telescopic rod, compresses the return spring between the fixed ring and the moving ring, changes the hinge angle between the first connecting rod and the second connecting rod, so that the positioning blocks on both sides can achieve radial uniform outward expansion, complete the self-centering clamping and fixing of the ball valve workpiece, avoids clamping contact with the ball valve surface, and avoids the formation of spraying dead angles. The symmetrical double-plate structure facilitates automated loading and unloading of ball valve workpieces. The two plates can move towards each other and extend into the inner cavity of the ball valve from both sides of the workpiece to complete the internal support positioning and clamping. The clamping process is simple and smooth. The positioning fixture is driven by two motors to move the vertical plate and rotate the ball valve respectively. The two motors are centrally located and the positioning fixture is symmetrically arranged from left to right. The worktable is subjected to more balanced forces during rotation, which improves rotational stability, counteracts the asymmetrical stress generated during rotation, reduces the shaking caused by centrifugal force, and makes the positioning accuracy of the positioning fixture more stable.

[0013] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the painting robot of the present invention; Figure 3 This is a schematic diagram of the positioning fixture of the present invention; Figure 4 This is a schematic diagram of the docking of the present invention; Figure 5 This is a schematic diagram of the ball valve fixing according to the present invention; Figure 6 This is a schematic diagram of the installation of the positioning block of the present invention.

[0015] In the diagram: 1. Workbench; 2. Installation station; 3. Spraying robot; 4. Supersonic flame spraying nozzle; 5. Vertical plate; 6. Fixed rod; 7. Telescopic rod; 8. Fixed ring; 9. Moving ring; 10. Positioning block; 11. Slide groove; 12. Drive gear; 13. Rotating shaft; 14. Slide rod; 15. First bevel gear set; 16. Transmission rod; 17. Second bevel gear set; 18. Worm gear; 19. Worm; 50. Transmission housing; 51. Upper rack; 52. Lower rack; 81. First connecting rod; 82. Return spring; 91. Second connecting rod. Detailed Implementation

[0016] See Figures 1 to 6A supersonic flame spraying treatment device includes a mounting base, on which a worktable 1 is rotatably mounted. Several mounting stations 2 are arranged around the worktable 1, and positioning fixtures are provided at each mounting station 2. Several spraying robots 3 are arranged outside the worktable 1, and supersonic flame spraying nozzles 4 are fixedly mounted at the execution ends of the spraying robots 3. After the workpiece is fixedly positioned by the positioning fixtures on the worktable 1, it is transported to the corresponding spraying station with the rotation of the worktable 1. The spraying robot 3 drives the supersonic flame spraying nozzle 4 to perform flame spraying on the workpiece. After spraying, the worktable 1 continues to rotate, and the workpiece is transported to the next cooling station for cooling treatment. After cooling, it enters the next spraying station.

[0017] The positioning fixture includes two symmetrically arranged upright plates 5, which are slidably installed on both sides of the installation station 2. The two upright plates 5 are connected to a driving mechanism, and the two upright plates 5 move towards or away from each other under the drive of the driving mechanism. A fixed rod 6 is rotatably installed on the upright plate 5, and a telescopic rod 7 is slidably installed on the fixed rod 6. The fixed rod 6 and the telescopic rod 7 are circumferentially fixed. A fixed ring 8 is fixedly provided on the outer side of the fixed rod 6. A plurality of first connecting rods 81 are provided on the fixed ring 8. A movable ring 9 is fixedly provided on the end of the telescopic rod 7 away from the fixed rod 6. A plurality of second connecting rods 91 are provided on the movable ring 9. One end of the first connecting rod 81 is hinged to the fixed ring 8, and the other end is hinged to one end of the second connecting rod 91. The other end of the second connecting rod 91 is hinged to the movable ring 9. A positioning block 10 is installed at the hinge of the first connecting rod 81 and the second connecting rod 91.

[0018] At least three positioning blocks 10 should be set.

[0019] A return spring 82 is provided between the fixed ring 8 and the moving ring 9. In its natural state, the return spring 82 keeps the fixed ring 8 and the moving ring 9 at a certain distance, and the positioning block 10 at the hinge is in an inwardly contracted state. When the moving ring 9 is squeezed by external force, the distance between the fixed ring 8 and the moving ring 9 is compressed, and the positioning block 10 at the hinge expands radially.

[0020] The movable ring 9 at the end of the telescopic rod is equipped with a docking block. The docking blocks on both sides adopt a tongue and groove mating structure. When the two upright plates move closer to each other, the two docking blocks are interlocked and the telescopic rods on both sides are coaxially aligned.

[0021] The telescopic rod and the fixed rod can withstand the gravity load and tension reaction force brought by the ball valve's own weight by their own structural strength. They are not easy to bend under pressure and can stably support and fix the workpiece.

[0022] The workbench 1 is provided with a slide groove 11, and the upright plate 5 is slidably installed in the slide groove 11. A drive gear 12 is rotatably installed below the workbench 1. The bottom of the two upright plates 5 are respectively connected to an upper rack 51 and a lower rack 52. The two sides of the drive gear 12 are meshed with the upper rack 51 and the lower rack 52. The drive gear 12 is driven to rotate by a moving motor.

[0023] A rotating shaft 13 is rotatably mounted below the workbench 1. Sliding rods 14 are slidably mounted on both sides of the rotating shaft 13. The sliding rods 14 are circumferentially fixed to the rotating shaft 13. The end of the fixed rod 6 away from the telescopic rod 7 is connected to a transmission rod 16 through a first bevel gear set 15. The transmission rod 16 is connected to the sliding rod 14 through a second bevel gear set 17. The rotating shaft 13 is driven to rotate by a rotating motor.

[0024] A worm gear 18 is installed in the middle of the rotating shaft 13. The worm gear 18 meshes with a worm 19, which is driven by a rotating motor.

[0025] The outer side of the upright plate 5 is provided with a transmission housing 50, and the transmission rod 16, the first bevel gear set 15 and the second bevel gear set 17 are all installed in the transmission housing 50.

[0026] In this embodiment, the ball valve is supported laterally. In other embodiments, the positioning fixture can also be designed as a vertical support.

[0027] Work process: First, the ball valve is clamped between the two vertical plates. Then, the moving motor is driven to rotate, causing the upper rack 51 and the lower rack 52 to move relative to each other, and the two vertical plates to move towards each other. The moving ring 9 completes the docking. The clamping force of the vertical plates moving forward is transmitted to the moving ring 9 through the docking block, compressing the return spring 82 between the fixed ring 8 and the moving ring 9. The distance between the fixed ring 8 and the moving ring 9 is shortened, causing the hinge angle of the first connecting rod 81 and the second connecting rod 91 to shrink. The multiple sets of positioning blocks 10 at the hinge point expand radially outward in sync, supporting the ball valve from multiple points on the inner wall of the inner hole, so as to realize the self-centering and internal support fixation of the inner diameter of the ball valve.

[0028] After the workpiece is clamped, the worktable 1 rotates by indexing, transferring the pre-installed ball valves to the spraying station in sequence. Upon arrival at the spraying station, the rotating motor is started. The motor drives the rotating shaft 13 to rotate synchronously via the worm gear 19 and worm wheel 18. The rotating shaft 13 drives the sliding rods 14 on both sides to rotate together. The power is transmitted to the fixed rod 6 via the second bevel gear set 17, the transmission rod 16, and the first bevel gear set 15. The fixed rod 6 drives the circumferentially limited telescopic rod 7 to rotate synchronously as a whole, so that the clamped ball valve rotates at a uniform speed.

[0029] The spraying robot 3 drives the supersonic flame spraying nozzle 4 to approach the outer wall of the rotating ball valve to perform spraying operations. After a single layer of coating is sprayed, the worktable 1 continues to rotate and clamp the workpiece to the cooling station for further cooling. After the workpiece is cooled, the worktable rotates again and sends it to the next spraying station, and the remaining coating is sprayed in a cycle. After all coatings are processed, the moving motor drives the drive gear 12 in reverse, the two side plates 5 separate in opposite directions, the return spring 82 rebounds and opens the fixed ring 8 and the moving ring 9, and each positioning block 10 retracts radially inward to release the workpiece constraint, so the finished ball valve can be removed and the unloading is completed.

[0030] This invention employs a three-layer gradient transition coating structure consisting of a NiCrAlY bonding underlayer, a WC-10Co4Cr main wear-resistant layer, and a nano-rare earth sealing layer, which is then sprayed in stages. A spraying robot with three stations sprays different coatings sequentially, with strict control over the thickness of each layer: the NiCrAlY bonding underlayer has a thickness of 50–100 μm, the main wear-resistant layer uses WC-10Co4Cr powder doped with 1–3 wt% nano-Y2O3 or CeO2, with a thickness of 200–400 μm, and the outermost nano-rare earth sealing layer has a thickness of 5–10 μm.

[0031] The spraying operation uses a mixture of hydrogen and kerosene fuel, with a volume ratio controlled at 1:10 to 1:20, and helium gas with a flow rate of 50 to 150 L / min as an auxiliary gas. With the help of helium to assist combustion, the flame velocity is increased to over 2200 m / s, and the powder particle impact velocity on the substrate can reach 800 m / s. The equipment is equipped with a real-time online particle monitoring and parameter feedback closed-loop control system to precisely control key process parameters: spraying distance is limited to 320 to 380 mm, powder feed rate is 60 to 100 g / min, and oxygen to fuel ratio is 4.2 to 4.8. The processing is combined with CO2 gas cooling temperature control to keep the ball valve substrate temperature below 150℃. The porosity of the formed coating is guaranteed to be less than 0.5% by relying on full parameter closed-loop control. The gradient coating is sprayed layer by layer in the order of base layer, main wear-resistant layer, and sealing layer.

[0032] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A supersonic flame spraying treatment device, characterized in that: The system includes a mounting base on which a workbench (1) is rotatably mounted. Several installation stations (2) are arranged around the workbench (1). Positioning fixtures are provided on the installation stations (2). Several spraying robots (3) are arranged on the outside of the workbench (1). The execution end of the spraying robot (3) is fixedly equipped with a supersonic flame spraying nozzle (4). After the workpiece is fixedly positioned by the positioning fixture on the workbench (1), it is transported to the corresponding spraying station of the nozzle as the workbench (1) rotates. The spraying robot (3) drives the supersonic flame spraying nozzle (4) to perform flame spraying on the workpiece. After the spraying is completed, the workbench (1) continues to rotate and the workpiece is transported to the next cooling station. The workpiece is cooled down at the next cooling station. After the cooling is completed, it enters the next spraying station.

2. The supersonic flame spraying equipment as described in claim 1, characterized in that: The positioning fixture includes two symmetrically arranged upright plates (5). The two upright plates (5) are slidably installed on both sides of the installation station (2). The two upright plates (5) are connected to a driving mechanism. The two upright plates (5) move towards each other or away from each other under the drive of the driving mechanism. A fixed rod (6) is rotatably installed on the upright plate (5). A telescopic rod (7) is slidably installed on the fixed rod (6). The fixed rod (6) and the telescopic rod (7) are circumferentially fixed. A fixing ring (8) is fixed on the outer side of the fixed rod (6). The upper ring is provided with several first connecting rods (81). The telescopic rod (7) is fixedly provided with a movable ring (9) at one end away from the fixed rod (6). The movable ring (9) is provided with several second connecting rods (91). One end of the first connecting rod (81) is hinged to the fixed ring (8), and the other end is hinged to one end of the second connecting rod (91). The other end of the second connecting rod (91) is hinged to the movable ring (9). A positioning block (10) is installed at the hinge of the first connecting rod (81) and the second connecting rod (91).

3. The supersonic flame spraying equipment as described in claim 2, characterized in that: A return spring (82) is provided between the fixed ring (8) and the moving ring (9). In its natural state, the return spring (82) keeps the fixed ring (8) and the moving ring (9) at a certain distance, and the positioning block (10) at the hinge is in an inwardly contracted state. When the moving ring (9) is squeezed by external force, the distance between the fixed ring (8) and the moving ring (9) is compressed, and the positioning block (10) at the hinge expands radially.

4. The supersonic flame spraying equipment as described in claim 3, characterized in that: The workbench (1) is provided with a slide groove (11), and the upright plate (5) is slidably installed in the slide groove (11). A drive gear (12) is rotatably installed below the workbench (1). The bottom of the two upright plates (5) are respectively connected to an upper rack (51) and a lower rack (52). The two sides of the drive gear (12) are meshed with the upper rack (51) and the lower rack (52). The drive gear (12) is driven to rotate by a moving motor.

5. The supersonic flame spraying equipment as described in claim 4, characterized in that: A rotating shaft (13) is rotatably mounted below the workbench (1). Slide rods (14) are slidably mounted on both sides of the rotating shaft (13). The slide rods (14) are circumferentially fixed to the rotating shaft (13). The end of the fixed rod (6) away from the telescopic rod (7) is connected to a transmission rod (16) through a first bevel gear set (15). The transmission rod (16) is connected to the slide rod (14) through a second bevel gear set (17). The rotating shaft (13) is driven to rotate by a rotating motor.

6. The supersonic flame spraying equipment as described in claim 5, characterized in that: A worm gear (18) is installed in the middle of the rotating shaft (13), and the worm gear (18) meshes with a worm (19), which is driven by a rotating motor.

7. The supersonic flame spraying equipment as described in claim 6, characterized in that: The outer side of the upright plate (5) is provided with a transmission housing (50), and the transmission rod (16), the first bevel gear set (15) and the second bevel gear set (17) are all installed in the transmission housing (50).

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