Device and method for collecting plasma spraying molten drops

Abstract

The invention discloses a device and method for collecting plasma spraying molten drops, and the device comprises a base platform which is horizontally arranged; the first rotating disc is horizontally arranged; the first turntable is connected to one end of the top of the base through a central rotating shaft; the molten drop collecting opening is formed in the first rotating disc and is close to the outer circumference of the first rotating disc; the second rotating disc is horizontally arranged; one end of the second turntable is connected to the other end of the top of the base through a rotating shaft; the second turntable is lower than the first turntable, so that the second turntable is positioned between the top of the base station and the first turntable; the mirror surface steel test piece is detachably mounted at the top of the second turntable and is arranged close to the other end of the second turntable; the plasma spray gun is fixedly arranged above the first rotating disc, and a nozzle of the plasma spray gun is vertically arranged downwards; when the second turntable rotates to the position where one end with the mirror surface steel test piece faces the central rotating shaft of the first turntable, the nozzle of the plasma spray gun corresponds to the mirror surface steel test piece in position.

Description

Technical Field

[0001] The invention belongs to the technical field of plasma spraying, and in particular relates to a device and a method for collecting plasma spraying droplets. Background Art

[0002] Plasma spraying is a cost-effective, flexible and industry-scalable manufacturing technology that is now widely used to manufacture protective coatings on the surfaces of parts in the aerospace, shipbuilding and automotive industries. Plasma spraying is essentially a process that uses plasma gas as a heat source to heat metal or ceramic powder into molten droplets with a certain temperature and speed, which impact the surface of the substrate and spread and solidify on it. This process has an important influence on the quality of the coating. By studying the spreading and solidification behavior of the molten droplets and the stacking process, we can clarify the causes of internal defects in the coating, improve our understanding of the coating formation mechanism, and guide the coating quality control more scientifically.

[0003] The collection of plasma spray droplets is divided into single droplet collection and multiple droplet stack collection. The existing droplet collection devices are all that the plasma spray gun arcs and feeds powder at the periphery after the sample is fixed, and the plasma flame flow is quickly moved to sweep across the substrate after the plasma flame flow is stable. The shortcomings of the existing technology are:

[0004] (1) In the process of collecting molten droplets, the spray gun position needs to move back and forth. The collection device needs to rely on the free movement of the spray gun from outside the substrate, in front of the device baffle, and outside the substrate to collect molten droplets. The movement of the spray gun causes the jet instability and other uncertain factors, which increases the inaccuracy of the experimental process.

[0005] (2) It is impossible to accurately determine whether the collected molten droplets are the molten droplets at the required plasma flame position. During the droplet collection process, it is impossible to distinguish whether the collected molten droplets are from the center of the plasma flame or flying out from the edge. Under the same parameters, the powder at different positions in the flame has different melting conditions and flight speeds, which affects the subsequent analysis of the droplet spreading morphology and geometric parameters.

[0006] Figure 7 The schematic diagram of the molten droplet collection process of the existing plasma spray gun molten droplet collection device is as follows: Figure 6 As shown, after the spray gun enters the substrate (test piece), a molten droplet is left on the surface of the substrate (test piece), and there is a layer of edge position molten droplets below the center position of the collected molten droplet stack, resulting in the stacking of molten droplets at different positions.

[0007] (3) The device is relatively complex. During the collection process, any shaking of the baffle or perforated metal plate will affect the quality of the collected droplets. Summary of the invention

[0008] The purpose of the present invention is to overcome the defects of the prior art and provide a device for collecting plasma sprayed molten droplets. During the sprayed molten droplet collection process, the spray gun and the substrate are relatively still, and it is possible to distinguish whether the collected molten droplets are in the center or edge of the plasma flame flow, and the molten droplets located in the center of the flame flow can be accurately collected.

[0009] The present invention also provides a method for collecting plasma spraying droplets, which can realize accurate collection of stacked droplets.

[0010] The present invention also provides a method for collecting plasma spraying droplets, which can realize accurate collection of single droplets.

[0011] The technical solution provided by the present invention is:

[0012] A device for collecting plasma spraying droplets, comprising:

[0013] the abutment, which is set horizontally;

[0014] A first turntable, which is a circular turntable and is arranged horizontally; the first turntable is connected to one end of the top of the base through a central rotating shaft;

[0015] A first motor, used for driving the first rotating disk to rotate;

[0016] A droplet collecting port is provided on the first rotating disk and is arranged close to the outer circumference of the first rotating disk;

[0017] A second turntable is a rectangular turntable and is arranged horizontally; one end of the second turntable is connected to the other end of the top of the base through a rotating shaft;

[0018] Wherein, the height of the second turntable is lower than that of the first turntable, so that the second turntable is located between the top of the base and the first turntable;

[0019] A second motor, used for driving the second rotating disk to rotate;

[0020] A mirror steel test piece, which is detachably mounted on the top of the second turntable and is disposed near the other end of the second turntable;

[0021] When the second turntable rotates to a position where the end with the mirror steel test piece faces the central rotation axis of the first turntable, driving the first turntable to rotate can make the droplet collecting port be located directly above the mirror steel test piece;

[0022] A plasma spray gun, which is fixedly arranged above the first rotating disk, and the nozzle of the plasma spray gun is arranged vertically downward;

[0023] When the second turntable rotates to a position where the end with the mirror steel test piece faces the central rotation axis of the first turntable, the plasma spray gun nozzle corresponds to the position of the mirror steel test piece.

[0024] Preferably, the device for collecting plasma spray droplets further comprises:

[0025] A droplet collecting baffle, which is detachably mounted on the top of the droplet collecting port;

[0026] Wherein, a plurality of through holes are arranged in an array on the droplet collecting baffle, and the array of through holes covers the entire droplet collecting port.

[0027] Preferably, the diameter of the through hole is 0.8 mm, and the interval between the centers of adjacent through holes is 30 mm.

[0028] Preferably, the base has a receiving cavity therein, and the first motor and the second motor are fixedly installed in the receiving cavity.

[0029] A method for collecting plasma spraying droplets, using the plasma spraying droplet device, comprises the following steps:

[0030] Install a mirror steel test piece on top of the second turntable;

[0031] The second rotating disk is driven by a second motor to rotate to a position where one end of the mirror steel test piece faces the central rotating axis of the first rotating disk;

[0032] The first motor drives the first rotating disk to rotate so that the molten droplet collecting port avoids the position of the mirror steel test piece, and the mirror steel test piece is blocked by the first rotating disk;

[0033] Turn on the plasma spray gun, wait for the flame flow to stabilize, and then drive the first turntable to rotate through the first motor so that the droplet collection port is located directly above the mirror steel test piece, so that the droplets sprayed from the plasma spray gun pass through the droplet collection port and impact on the mirror steel test piece, thereby realizing the collection of stacked droplets.

[0034] Preferably, the method for collecting plasma spray droplets further comprises:

[0035] When the collection of the stacked droplets is completed, the first motor drives the first turntable to rotate so that the droplet collection port avoids the position of the mirror steel test piece. After the mirror steel test piece is blocked by the first turntable, the spray gun is closed.

[0036] A method for collecting plasma spraying droplets, using the plasma spraying droplet device, comprises the following steps:

[0037] Install a mirror steel test piece on top of the second turntable;

[0038] The second rotating disk is driven by a second motor to rotate to a position where one end of the mirror steel test piece faces the central rotating axis of the first rotating disk;

[0039] The first motor drives the first rotating disk to rotate, so that the droplet collecting baffle avoids the position of the mirror steel test piece, and the mirror steel test piece is blocked by the first rotating disk;

[0040] Turn on the plasma spray gun, wait for the flame flow to stabilize, and then drive the first rotary disc to rotate continuously through the first motor;

[0041] Whenever the droplet collecting baffle rotates to the position directly above the mirror steel test piece, the droplets sprayed from the plasma spray gun pass through the droplet collecting baffle and impact on the mirror steel test piece, thereby collecting a single droplet.

[0042] The beneficial effects of the present invention are:

[0043] (1) The device for collecting plasma spray droplets provided by the present invention can accurately obtain droplets at different positions of the plasma flame flow; it is used to reduce the movement of the spray gun, and the entire droplet collection process is kept as stable as possible; and the interference of edge droplet splashing on droplet collection is minimized as much as possible.

[0044] (2) The device for collecting plasma spraying droplets provided by the present invention has a simple structure, is easy to operate, and minimizes the influence of process factors on the quality of droplets.

[0045] (3) The device for collecting plasma spray droplets provided by the present invention is simple to operate when replacing the test piece and can strictly ensure the distance between the test piece and the spray gun, which effectively reduces the experimental uncertainty caused by the shaking of the fixture and other devices during the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the overall structure of the device for collecting plasma sprayed droplets (used for collecting stacked droplets) according to the present invention.

[0047] Figure 2 It is a schematic diagram of the overall structure of the device for collecting plasma spraying droplets (used for collecting single droplets) according to the present invention.

[0048] Figure 3 A schematic diagram of the positional relationship between the first turntable and the second turntable when installing a mirror steel test piece in the method for collecting plasma spray droplets described in the present invention.

[0049] Figure 4 The present invention is a schematic diagram of the positional relationship between the first rotating disk and the second rotating disk when the flame flow is not stable in the method for collecting plasma spraying droplets described in the present invention.

[0050] Figure 5The present invention is a schematic diagram of the positional relationship between the first turntable and the second turntable when collecting droplets in the method for collecting plasma spraying droplets of the present invention.

[0051] Figure 6 It is a schematic diagram of the droplet collection process in the method for collecting plasma spraying droplets described in the present invention.

[0052] Figure 7 It is a schematic diagram of the molten droplet collection process of the existing plasma spray gun molten droplet collection device in the background technology of the present invention. DETAILED DESCRIPTION

[0053] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0054] like Figure 1 As shown, the present invention provides a device for collecting plasma sprayed droplets, which is used to collect stacked droplets, and mainly includes: a base 110, a first turntable 120, a second turntable 130, a mirror steel test piece 140 and a plasma spray gun 150.

[0055] The base 110 is a rectangular parallelepiped and is arranged horizontally. The first turntable 120 is a circular turntable and is arranged horizontally. A central rotating shaft 121 is fixedly connected to the center of the lower side of the first turntable 120, and the first turntable 120 is rotatably connected to one end of the top of the base 110 through the central rotating shaft 121. The power output shaft of the first motor is connected to the central rotating shaft 121, and is used to drive the first turntable 120 to rotate.

[0056] The droplet collecting port 122 is opened on the first rotating disk 120 and is disposed close to the outer circumference of the first rotating disk 120 .

[0057] The second turntable 130 is a rectangular turntable, which is arranged horizontally; a rotating shaft 131 is fixedly connected to one end of the lower side of the second turntable 130, and the second turntable 130 is rotatably connected to the other end of the top of the base 110 through the rotating shaft 131. The power output shaft of the second motor is connected to the rotating shaft 131, which is used to drive the second turntable 130 to rotate.

[0058] The height of the second turntable 130 is lower than that of the first turntable 120 , that is, in the vertical direction, the second turntable 130 is located between the top of the base 110 and the first turntable 120 , and the second turntable 130 and the first turntable 120 can rotate independently without interference.

[0059] The mirror steel test piece 140 is detachably mounted on the top of the second turntable 130 by a clamp, and is disposed near the other end of the second turntable 130 (the end away from the rotating shaft 131 ).

[0060] When the second turntable 130 rotates to a position where one end with the mirror steel test piece 140 faces the central rotation axis 121 of the first turntable 120 , driving the first turntable 120 to rotate enables the droplet collecting port 122 to be located directly above the mirror steel test piece 140 .

[0061] The plasma spray gun 150 is fixedly arranged above the first rotating disk 120, and the nozzle of the plasma spray gun 150 is arranged vertically downward. When the second rotating disk 130 rotates to a position where one end of the mirror steel test piece 140 faces the central rotating shaft 121 of the first rotating disk 120, the nozzle of the plasma spray gun 150 corresponds to the position of the mirror steel test piece 140, that is, the mirror steel test piece 140 is located directly below the nozzle of the plasma spray gun 150.

[0062] like Figure 2 As shown, the present invention also provides a device for collecting plasma spray droplets, which is used to collect single droplets. Figure 1 On the basis of the device for collecting stacked molten droplets shown, the device for collecting single molten droplets is further provided with a molten droplet collecting baffle 160, which is detachably mounted on the top of the molten droplet collecting port 122. The molten droplet collecting baffle 160 is provided with a plurality of through holes in an array, and the array area of ​​the through holes covers the entire molten droplet collecting port 122.

[0063] In this embodiment, the plasma spray gun 150 is fixed by a mechanical arm, and the spray gun can be removed after the test is completed. The plasma spray gun 150 can also be fixed by other fixing devices.

[0064] As a preference, the diameter of the through holes is 0.8 mm, and the interval between the centers of adjacent through holes is 30 mm.

[0065] As a preference, the base 140 has a receiving cavity therein, and the first motor and the second motor are fixedly installed in the receiving cavity of the base 140 .

[0066] like Figure 3-5 As shown, the present invention also provides a method for collecting plasma spray droplets, using Figure 1 The plasma spraying droplet device shown is used to collect stacked droplets, and the specific process is as follows.

[0067] (1) The second motor drives the second turntable 130 to rotate to a position where one end of the mirror steel test piece 140 is away from the central rotation axis 121 of the first turntable 120, that is, Figure 3 The mirror steel test piece 140 is mounted on the top of the second turntable 130 by a fixture.

[0068] (2) The second motor drives the second turntable 130 to rotate until one end of the mirror steel test piece 140 faces the central rotation axis 121 of the first turntable 120, that is, Figure 4The first motor drives the first turntable 120 to rotate so that the droplet collecting port 122 avoids the position of the mirror steel test piece 140, that is, Figure 4 At the middle position c, the mirror steel test piece 140 is blocked by the first rotating disk 120 .

[0069] (3) Turn on the plasma spray gun, and the molten droplets ejected from the spray gun hit the first turntable 120; wait for the flame flow ejected from the spray gun to stabilize, and then drive the first turntable 110 to rotate by the first motor so that the molten droplet collection port 122 is directly above the mirror steel test piece 140, that is, Figure 5 At the middle position b, the molten droplets sprayed from the plasma spray gun 150 are made to collide with the mirror steel test piece 140 through the molten droplet collecting port 122, thereby realizing the collection of the stacked molten droplets.

[0070] like Figure 6 As shown, during the process of collecting molten droplets by the plasma spraying molten droplet device provided by the present invention, the plasma spray gun 150 and the mirror steel test piece (substrate) 140 are relatively stationary, and the collected multi-layer molten droplet stack can better distinguish the molten droplets at different positions of the flame flow.

[0071] (4) When the collection of the stacked droplets is completed, the first motor drives the first rotating disk 110 to rotate so that the droplet collection port 122 avoids the position of the mirror steel test piece 140. After the mirror steel test piece is blocked by the first rotating disk, the spray gun is turned off. This ensures that after the collection is completed, no extra unstable flame flow will affect the collected droplets.

[0072] The present invention provides a method for collecting plasma spray droplets, using Figure 2 The plasma spraying droplet device shown is used to collect stacked droplets, and the specific process is as follows.

[0073] (1) The second motor drives the second turntable 130 to rotate to a position where one end with the mirror steel test piece 140 is away from the central rotation axis 121 of the first turntable 120; and the mirror steel test piece 140 is mounted on the top of the second turntable 130 by a clamp.

[0074] (2) The second motor drives the second turntable 130 to rotate to a position where one end of the mirror steel test piece 140 faces the central rotation axis 121 of the first turntable 120. The first motor drives the first turntable 120 to rotate so that the droplet collection port 122 (droplet collection baffle 160) avoids the position of the mirror steel test piece 140, and the mirror steel test piece 140 is blocked by the first turntable 120.

[0075] (3) Turn on the plasma spray gun, and the molten droplets ejected from the spray gun hit the first turntable 120; wait for the flame flow ejected from the spray gun to stabilize, and then drive the first turntable 120 to rotate continuously by the first motor; whenever the molten droplet collecting baffle 160 rotates to the top of the mirror steel test piece 140, the molten droplets ejected from the plasma spray gun hit the mirror steel test piece 140 through the through holes arrayed on the molten droplet collecting baffle 160, thereby realizing the collection of single molten droplets.

[0076] (4) When the collection of the stacked droplets is completed, the first motor drives the first turntable 110 to rotate so that the droplet collection port 122 avoids the position of the mirror steel test piece 140. After the mirror steel test piece 140 is blocked by the first turntable, the spray gun is closed.

[0077] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A device for collecting plasma spray droplets, characterized in that: include: the abutment, which is set horizontally; A first turntable, which is a circular turntable and is arranged horizontally; the first turntable is connected to one end of the top of the base through a central rotating shaft; A first motor, used for driving the first rotating disk to rotate; A droplet collecting port is provided on the first rotating disk and is arranged close to the outer circumference of the first rotating disk; A second turntable is a rectangular turntable and is arranged horizontally; one end of the second turntable is connected to the other end of the top of the base through a rotating shaft; Wherein, the height of the second turntable is lower than that of the first turntable, so that the second turntable is located between the top of the base and the first turntable; A second motor, used for driving the second rotating disk to rotate; A mirror steel test piece, which is detachably mounted on the top of the second turntable and is disposed near the other end of the second turntable; When the second turntable rotates to a position where the end with the mirror steel test piece faces the central rotation axis of the first turntable, driving the first turntable to rotate can make the droplet collecting port be located directly above the mirror steel test piece; A plasma spray gun, which is fixedly arranged above the first rotating disk, and the nozzle of the plasma spray gun is arranged vertically downward; When the second turntable rotates to a position where the end with the mirror steel test piece faces the central rotation axis of the first turntable, the plasma spray gun nozzle corresponds to the position of the mirror steel test piece.

2. The device for collecting plasma spray droplets according to claim 1, characterized in that: Also includes: A droplet collecting baffle, which is detachably mounted on the top of the droplet collecting port; Wherein, a plurality of through holes are arranged in an array on the droplet collecting baffle, and the array of through holes covers the entire droplet collecting port.

3. The device for collecting plasma spray droplets according to claim 2, characterized in that: The diameter of the through holes is 0.8 mm, and the interval between the centers of adjacent through holes is 30 mm.

4. The device for collecting plasma spray droplets according to claim 1 or 3, characterized in that: The base has a receiving cavity therein, and the first motor and the second motor are fixedly installed in the receiving cavity.

5. A method for collecting plasma spray droplets, using the plasma spray droplet collection device as claimed in claim 1, characterized in that: The steps include: Install a mirror steel test piece on top of the second turntable; The second rotating disk is driven by a second motor to rotate to a position where one end of the mirror steel test piece faces the central rotating axis of the first rotating disk; The first motor drives the first rotating disk to rotate so that the molten droplet collecting port avoids the position of the mirror steel test piece, and the mirror steel test piece is blocked by the first rotating disk; Turn on the plasma spray gun, wait for the flame flow to stabilize, and then drive the first turntable to rotate through the first motor so that the droplet collection port is located directly above the mirror steel test piece, so that the droplets sprayed from the plasma spray gun pass through the droplet collection port and impact on the mirror steel test piece, thereby realizing the collection of stacked droplets.

6. The method for collecting plasma spray droplets according to claim 5, characterized in that: Also includes: When the collection of the stacked droplets is completed, the first motor drives the first turntable to rotate so that the droplet collection port avoids the position of the mirror steel test piece. After the mirror steel test piece is blocked by the first turntable, the spray gun is closed.

7. A method for collecting plasma spray droplets, using the plasma spray droplet collection device as claimed in claim 2 or 3, characterized in that: The steps include: Install a mirror steel test piece on top of the second turntable; The second rotating disk is driven by a second motor to rotate to a position where one end of the mirror steel test piece faces the central rotating axis of the first rotating disk; The first motor drives the first rotating disk to rotate, so that the droplet collecting baffle avoids the position of the mirror steel test piece, and the mirror steel test piece is blocked by the first rotating disk; Turn on the plasma spray gun, wait for the flame flow to stabilize, and then drive the first rotary disc to rotate continuously through the first motor; Whenever the droplet collecting baffle rotates to the position directly above the mirror steel test piece, the droplets sprayed from the plasma spray gun pass through the droplet collecting baffle and impact on the mirror steel test piece, thereby collecting a single droplet.

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