Ceramic radome protective coating spraying device and method

Abstract

The invention discloses a ceramic radome protective coating spraying device and method. The spraying device comprises a rotary fixing unit, a spraying unit and a cover body internal negative pressure control unit. The rotary fixing unit comprises a supporting device and a first power device; during spraying, the ceramic antenna housing is arranged outside the supporting device in a sleeving manner; the interior of the ceramic radome and the supporting device form a first closed accommodating space; the spraying unit comprises an injection system and a second transmission device connected with the injection system; the injection system comprises an injection device; an outlet of the spraying device is arranged opposite to the antenna housing arranged outside the supporting device in a sleeving manner; the negative pressure control unit in the cover body comprises an air outlet pipeline, and an air outlet of the air outlet pipeline is located in the first closed containing space. And the coating quantitatively enters the surface layer of the ceramic radome, and the coating does not deeply enter the ceramic radome.

Description

Technical Field

[0001] The present invention relates to the field of radomes, and in particular to the field of a protective coating spraying device and method for a ceramic radome. Background Art

[0002] Ceramic radomes are mostly made of porous ceramic materials such as quartz ceramics, quartz fiber composite quartz ceramics and silicon nitride ceramics. They are located at the front end of the hypersonic vehicle, on the outside of the antenna, and play the role of conformal protection, heat insulation and wave transmission. They are one of its key components. A radome protective coating is attached to the outer surface of the radome, which protects the radome from dust, rain, etc.

[0003] During the spraying process of the protective coating on the antenna cover, there are problems such as low efficiency and poor spraying effect, that is, the protective coating is uneven, which leads to thick local coating, affecting the wave transmission performance of the ceramic components and bringing the risk of easy cracking of the coating. At the same time, due to the porous structure inside the ceramic antenna cover, the coating will enter too deeply into the ceramic antenna cover, resulting in reduced thermal insulation performance of the ceramic antenna cover; or the coating cannot enter the surface of the ceramic antenna cover, resulting in coating falling off.

[0004] Therefore, how to achieve high spraying efficiency of the ceramic radome coating, uniform adhesion of the protective coating, and quantitative penetration of the coating into the surface of the ceramic radome without deep penetration of the coating into the ceramic radome; that is, how to achieve high bonding strength between the protective coating and the ceramic radome and avoid the problem of reduced thermal insulation performance of the ceramic radome, has become an urgent problem to be solved in this field. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, a ceramic radome protective coating spraying device and method are provided to achieve high ceramic radome coating spraying efficiency, uniform adhesion of the protective coating, and quantitative penetration of the coating into the surface of the ceramic radome and the shallow penetration of the coating into the ceramic radome; that is, high bonding strength between the protective coating and the ceramic radome is achieved and the problem of reduced thermal insulation performance of the ceramic radome is avoided.

[0006] According to one aspect of the present invention, a ceramic radome protective coating spraying device is provided, comprising: a rotating fixing unit, a spraying unit, and a negative pressure control unit inside the radome;

[0007] The rotating and fixing unit comprises a supporting device and a first power device;

[0008] During spraying, the ceramic antenna cover is sleeved on the outside of the supporting device; the inside of the ceramic antenna cover and the supporting device form a first closed accommodating space;

[0009] The spraying unit includes a spraying system and a second transmission device connected to the spraying system;

[0010] The injection system includes an injection device; the outlet of the injection device is arranged opposite to the antenna cover sleeved on the outside of the supporting device;

[0011] The negative pressure control unit inside the cover body comprises an air outlet pipeline, and the air outlet of the air outlet pipeline is located in the first closed accommodating space;

[0012] Preferably, it also includes a PLC control system, which controls the first power device to drive the ceramic antenna cover to rotate through the PLC control system; controls the second transmission device to drive the injection system to move along a preset route; and controls the injection system to automatically start and spray; and controls the negative pressure control unit inside the cover through the PLC control system to automatically achieve the negative pressure inside the antenna cover to reach the preset pressure.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: a ceramic antenna cover protective coating spraying device includes: a rotating fixing unit, a spraying unit, and a negative pressure control unit inside the cover; the ceramic antenna cover is fixed by the rotating fixing unit, and the ceramic antenna cover is driven to rotate at a preset rate; the coating slurry is sprayed out through the spray gun outlet by the spraying unit, and the spray gun outlet reciprocates in the vertical direction at a preset rate; thereby, the coating slurry is evenly sprayed onto the surface of the ceramic antenna cover;

[0014] A first closed accommodating space is formed by the interior of the ceramic antenna cover and the supporting device, and the negative pressure control unit inside the cover includes an air outlet pipeline, and the air outlet of the air outlet pipeline is located in the first closed accommodating space, so that the inner surface of the ceramic antenna cover is in a negative pressure environment, so that the paint slurry sprayed on the outer surface of the ceramic antenna cover can be uniformly infiltrated into the outer surface of the ceramic antenna cover under the negative pressure of the inner surface of the ceramic antenna cover, and the depth of the paint slurry infiltrating into the outer surface of the ceramic antenna cover is controlled by the size of the negative pressure according to the penetration amount;

[0015] This achieves high spraying efficiency for the ceramic radome coating, uniform adhesion of the protective coating, and the coating quantitatively penetrates into the surface of the ceramic radome and does not penetrate deeply into the ceramic radome; that is, the protective coating and the ceramic radome have a high bonding strength and the problem of reduced thermal insulation performance of the ceramic radome is avoided.

[0016] Further, the support device includes a first profiling tool, a second profiling tool, and a transmission connecting rod;

[0017] The first profiling device comprises a first tooling body and a first elastic profiling support portion sleeved outside the first tooling body; the first elastic profiling support portion is made of elastic material, and the outer surface of the first elastic profiling support portion is designed to be profiling with the outer surface of the large end of the ceramic antenna cover opening;

[0018] The second profiling device includes a second tooling body and a second elastic profiling support portion sleeved on the outside of the second tooling body; the second elastic profiling support portion is made of elastic material, and the outer surface of the contact portion between the ceramic antenna cover and the second elastic profiling support portion is designed to be contoured with the outer surface of the second elastic profiling support portion.

[0019] The beneficial effect of adopting the above step is that the ceramic antenna cover is fixed to the outside of the first profiling tooling and the second profiling tooling by the supporting device including the first profiling tooling and the second profiling tooling;

[0020] By means of the contour design of the outer surface of the first elastic contoured support portion and the outer surface of the large end portion of the opening of the ceramic antenna cover, the ceramic antenna cover and the first contoured tooling can be connected without forcing the ceramic antenna cover to be mounted on the outer surface of the first contoured tooling. The ceramic antenna cover is mounted on the outer surface of the first contoured tooling, with the axis of the ceramic antenna cover being perpendicular to the horizontal plane as a standard, and then a vacuum is drawn in the first closed accommodating space formed inside the ceramic antenna cover and the support device, thereby expanding the first elastic contoured support portion to achieve an interference connection between the inner wall of the ceramic antenna cover and the support device, and the antenna cover is kept installed at a preset height and position without causing damage to the ceramic antenna cover.

[0021] Furthermore, the first profiling tooling and the second profiling tooling are arranged in parallel, and the transmission connecting rod is arranged perpendicular to the first profiling tooling; the first profiling tooling and the second profiling tooling are sleeved outside the transmission connecting rod;

[0022] One end of the transmission connecting rod away from the first profiling tooling and the second profiling tooling is connected to the first power device through the first transmission device or directly.

[0023] The beneficial effect of adopting the previous step is that the first contour tooling and the second contour tooling are driven to rotate through the transmission connecting rod, thereby driving the ceramic antenna cover to rotate at a preset speed.

[0024] Furthermore, the spray unit also includes an air source, a pressure reducing valve, and a first control valve;

[0025] The gas source is connected to the pressure reducing valve through the gas pipeline, the pressure reducing valve is connected to the first control valve through the gas pipeline, and the first control valve is connected to the injection device through the gas pipeline;

[0026] The spraying device includes a spray gun and a paint storage device connected to the spray gun inlet;

[0027] The first control valve is connected to the paint storage device through an air delivery pipeline.

[0028] The beneficial effect of adopting the previous step is that the gas source controls the outlet pressure at a preset pressure through the pressure reducing valve, and controls the release and shutoff of the gas in the gas source through the first control valve; thereby controlling the gas of the preset pressure to enter or not enter the paint storage device, controlling the mixing of the paint slurry and the gas in the paint storage device, and spraying the paint slurry through the spray gun under the drive of the gas.

[0029] Furthermore, the negative pressure control unit inside the cover body also includes a vacuum pump, a second control valve, a frequency converter, and a negative pressure sensor;

[0030] The negative pressure sensor is arranged in the first closed accommodating space;

[0031] The gas outlet pipeline is connected to the second control valve through the gas supply pipeline, and the second control valve is connected to the vacuum pump through the gas supply pipeline; the frequency converter is electrically connected to the vacuum pump.

[0032] The beneficial effect of adopting the previous step is that the negative pressure value in the first enclosed space is detected by the negative pressure sensor and transmitted to the control system, and the control system controls the frequency converter to adjust the vacuum pump to control the negative pressure in the first enclosed space within a preset range.

[0033] Another aspect of the present invention is to invent a method for spraying a protective coating on a ceramic radome, wherein the ceramic radome is sprayed with a protective coating spraying device for the ceramic radome; the method specifically comprises the following steps:

[0034] preparing a coating slurry;

[0035] adding the coating slurry into a coating storage device;

[0036] The ceramic antenna cover is sleeved on the outside of the supporting device of the rotating and fixing unit, and the ceramic antenna cover is interference-connected with the supporting device;

[0037] The negative pressure inside the first closed accommodating space formed by the interior of the ceramic antenna cover and the supporting device is set within a preset negative pressure range by means of a negative pressure control unit inside the cover body;

[0038] The ceramic radome is controlled to rotate by a rotating fixing unit;

[0039] The spraying device of the spraying system is controlled to reciprocate in the vertical direction by the second transmission device of the spraying system of the spraying unit, and the spraying device sprays the coating slurry onto the surface of the ceramic radome;

[0040] A coating slurry is applied to the surface of the ceramic radome.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows: by sleeve-arranging the ceramic antenna cover on the outside of the supporting device of the rotating and fixing unit, the ceramic antenna cover and the supporting device are interference-connected, so that the antenna cover body is fixed and no obstacles are generated when the protective coating is sprayed on the outer surface, and at the same time, the deviation between the actual installation position of the ceramic antenna cover body and the preset installation position is avoided, and no damage is caused to the antenna cover body; the rotation of the ceramic antenna cover is controlled by the rotating and fixing unit, which is conducive to spraying the coating slurry on the surface of the ceramic antenna cover more evenly;

[0042] The negative pressure inside the first closed accommodating space formed by the interior of the ceramic antenna cover and the supporting device is set within a preset negative pressure range through a negative pressure control unit inside the cover body, so that the inner surface of the ceramic antenna cover is in a negative pressure environment, thereby achieving that the paint slurry sprayed on the outer surface of the ceramic antenna cover is uniformly infiltrated into the outer surface of the ceramic antenna cover under the negative pressure on the inner surface of the ceramic antenna cover, and the depth of the paint slurry infiltrating into the outer surface of the ceramic antenna cover is controlled by the size of the negative pressure according to the penetration amount;

[0043] The second transmission device of the spray system of the spray unit controls the spray device of the spray system to reciprocate in the vertical direction, so that the paint slurry sprayed on the outer surface of the ceramic antenna cover is relatively uniform;

[0044] This achieves high spraying efficiency for the ceramic radome coating, uniform adhesion of the protective coating, and the coating quantitatively penetrates into the surface of the ceramic radome and does not penetrate deeply into the ceramic radome; that is, the protective coating and the ceramic radome have a high bonding strength and the problem of reduced thermal insulation performance of the ceramic radome is avoided.

[0045] Furthermore, the coating slurry comprises a silicon-containing resin, a binder resin, a solvent, and a ceramic powder in a mass ratio of (20-50):(10-20):(10-30):(20-30);

[0046] The silicon-containing resin includes one or two of methyl silicone resin and phenyl silicone resin;

[0047] The bonding resin includes one or more of epoxy resin and acrylic resin;

[0048] The solvent includes one or more of ethanol, propanol, ethyl acetate, and toluene;

[0049] The ceramic powder includes one or two of silicon micropowder and boron nitride powder;

[0050] The particle size of the ceramic powder is ≤6 microns;

[0051] The coating slurry has a viscosity of 30-150 mPa.s.

[0052] The beneficial effect of adopting the previous step is that the solvent content in the coating slurry is not high, and the viscosity of the coating slurry is 30-150mPa.s, which is conducive to achieving that the coating slurry does not flow when it reaches the surface of the ceramic antenna cover and can adhere to the surface, and the negative pressure on the inner surface of the ceramic antenna cover allows the coating slurry on the surface to penetrate into a certain depth, thereby achieving a high bonding strength between the protective coating and the ceramic antenna cover without affecting the thermal insulation performance of the ceramic antenna cover;

[0053] The coating slurry includes ceramic powder with a particle size of ≤6 microns, thereby enabling the ceramic powder to enter the interior of the ceramic antenna cover, and facilitating the coating slurry to stay inside the ceramic antenna cover and not penetrate too deeply into the ceramic antenna cover under negative pressure.

[0054] Furthermore, the interference connection process of the ceramic antenna cover and the supporting device includes the following steps:

[0055] The ceramic radome is sleeved on the outside of the first profiling tooling and the second profiling tooling, the ceramic radome is vertically arranged, and the first profiling tooling is located at the end opening of the ceramic radome; the interior of the ceramic radome and the supporting device form an accommodating space;

[0056] Turning on the vacuum pump and the second control valve to extract the gas in the accommodating space through the gas outlet of the gas outlet pipeline in the accommodating space to reduce the gas pressure in the accommodating space;

[0057] The first elastic contour support portion sleeved on the outside of the first tooling body expands under a negative pressure environment to achieve interference connection between the first contouring tooling and the inner wall of the ceramic antenna cover;

[0058] A first enclosed accommodation space formed by the interior of the ceramic antenna cover and the supporting device;

[0059] The vacuum pump is controlled by a frequency converter to control the negative pressure in the first closed accommodating space to be -0.05MPa to -0.04MPa.

[0060] The beneficial effect of adopting the previous step is that the negative pressure in the first enclosed accommodation space is controlled to -0.05MPa to -0.04MPa by controlling the vacuum pump through the frequency converter, thereby achieving an interference fit between the ceramic antenna cover and the supporting device without causing damage to the ceramic antenna cover. At the same time, under this pressure, the paint slurry just applied to the surface of the ceramic antenna cover will not enter too deeply into the ceramic antenna cover.

[0061] Furthermore, during the process of reciprocating the spray device of the spray system in the vertical direction by controlling the second transmission device of the spray system of the spray unit, the negative pressure inside the first enclosed accommodating space is controlled at -0.08MPa to -0.07MPa.

[0062] The beneficial effect of adopting the previous step is that when the paint slurry is sprayed onto the surface of the ceramic antenna cover by the injection device, the negative pressure inside the first enclosed accommodation space is controlled at -0.08MPa to -0.07MPa, so that the negative pressure increases when the paint slurry on the surface of the ceramic antenna cover begins to penetrate into the ceramic antenna cover, thereby avoiding the increase in the penetration resistance of the paint slurry, which leads to the inability to penetrate and does not penetrate deeply.

[0063] Furthermore, the second transmission device of the spray system of the spray unit controls the spray gun outlet movement trajectory of the spray device to reciprocate from top to bottom along a direction parallel to the outer surface of the radome, and the spray gun outlet movement speed v, the ceramic radome rotation speed ω, and the height h of the spray gun outlet from the large end of the ceramic radome are controlled according to the equation curve;

[0064] The specific equation curve formula is: v = 0.5*ω*(h / H+a);

[0065] ω is set to 5-20r / min; H is the height of the antenna cover; a is the adjustment coefficient, and a is set between 0.5-3;

[0066] The outlet pressure of the spray gun is 0.08-0.3MPa.

[0067] The beneficial effect of adopting the previous step is that, through the equation curve formula: v = 0.5*ω*(h / H+a), the coating slurry sprayed on the surface of the ceramic antenna cover is uniform and can be automatically controlled, the operation is simple, and there will be no problem of excessive thickness in some places;

[0068] The outlet pressure of the spray gun is 0.08-0.3MPa, that is, the paint slurry will reach the surface of the ceramic antenna cover and will not be directly sprayed into the interior of the ceramic antenna cover due to excessive injection pressure, thereby achieving controllable depth of penetration of the paint slurry into the interior of the ceramic antenna cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 This is a schematic diagram of the ceramic antenna cover protective coating spraying device of Example 1.

[0070] Numbers shown in the figure: 1, air source; 2, pressure reducing valve; 3, first control valve; 4, second transmission device; 5, spray gun; 6, ceramic antenna cover; 7, first profiling tooling; 8, second profiling tooling; 9, transmission connecting rod; 10, air outlet of the air outlet pipeline; 11, first power device; 12, second control valve; 13, vacuum pump; 14, inverter; 15, negative pressure sensor. DETAILED DESCRIPTION

[0071] In order to better understand the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0072] Embodiment 1:

[0073] One aspect of the present embodiment provides a ceramic antenna cover protective coating spraying device comprising: a rotating fixing unit, a spraying unit, a negative pressure control unit inside the cover body, and a PLC control system;

[0074] The rotating and fixing unit comprises a supporting device and a first power device 11, wherein the first power device 11 is a rotating servo motor;

[0075] The supporting device comprises a first profiling tool 7, a second profiling tool 8, and a transmission connecting rod 9;

[0076] The first profiling device comprises a first tooling body and a first elastic profiling support portion sleeved outside the first tooling body; the first elastic profiling support portion is made of elastic material, and the outer surface of the first elastic profiling support portion is designed to be profiling with the outer surface of the large end of the opening of the ceramic antenna cover 6;

[0077] The second profiling device comprises a second tool body and a second elastic profiling support portion sleeved outside the second tool body; the second elastic profiling support portion is made of elastic material, and the outer surface of the contact portion between the ceramic antenna cover 6 and the second elastic profiling support portion is designed to be profiling with the outer surface of the second elastic profiling support portion;

[0078] The first profiling tool 7 and the second profiling tool 8 are arranged in parallel, and the transmission connecting rod 9 is arranged perpendicular to the first profiling tool 7; the first profiling tool 7 and the second profiling tool 8 are sleeved outside the transmission connecting rod 9;

[0079] One end of the transmission connecting rod 9 away from the first profiling tool 7 and the second profiling tool 8 is connected to the first power device 11 through the first transmission device or directly.

[0080] During spraying, the ceramic antenna cover 6 is sleeved on the outside of the supporting device; the inside of the ceramic antenna cover 6 and the supporting device form a first closed accommodation space;

[0081] The spraying unit includes a spraying system and a second transmission device 4 connected to the spraying system, wherein the second transmission device 4 is a robot arm, and the robot arm is electrically connected to the PLC control system;

[0082] The injection system includes an injection device; the outlet of the injection device is arranged opposite to the antenna cover sleeved on the outside of the supporting device;

[0083] The spraying unit also includes an air source 1, a pressure reducing valve 2, and a first control valve 3;

[0084] The gas source 1 is connected to the pressure reducing valve 2 through the gas pipeline, the pressure reducing valve 2 is connected to the first control valve 3 through the gas pipeline, and the first control valve 3 is connected to the injection device through the gas pipeline;

[0085] The spraying device comprises a spray gun 5 and a paint storage device connected to the inlet of the spray gun 5;

[0086] The first control valve 3 is connected to the paint storage device through an air delivery pipeline.

[0087] The negative pressure control unit inside the housing includes an air outlet pipeline, a vacuum pump 13, a second control valve 12, a frequency converter 14, and a negative pressure sensor 15. The air outlet 10 of the air outlet pipeline is located in the first enclosed accommodation space; the negative pressure sensor 15 is arranged in the first enclosed accommodation space;

[0088] The gas outlet pipeline is connected to the second control valve 12 through the gas supply pipeline, and the second control valve 12 is connected to the vacuum pump 13 through the gas supply pipeline; the frequency converter 14 is electrically connected to the vacuum pump 13.

[0089] The first power device 11 is controlled by the PLC control system to drive the ceramic antenna cover 6 to rotate; the second transmission device 4 is controlled to drive the injection system to move along a preset route; at the same time, the injection system is controlled to automatically start and spray; at the same time, the negative pressure control unit inside the cover is controlled by the PLC control system to achieve the automatic negative pressure inside the antenna cover reaching the preset pressure.

[0090] On the other hand, the present embodiment discloses a method for spraying a protective coating on a ceramic radome, wherein a ceramic radome protective coating spraying device is used to spray the ceramic radome 6; the method specifically comprises the following steps: preparing a coating slurry; the coating slurry comprises a silicone-containing resin, a bonding resin, a solvent, and a ceramic powder in a mass ratio of 35:15:20:25; the silicone-containing resin comprises a methyl silicone resin;

[0091] The bonding resin includes epoxy resin; the solvent includes ethanol; the ceramic powder includes silicon powder;

[0092] The particle size of the ceramic powder is ≤6 microns; the viscosity of the coating slurry is 90mPa.s.

[0093] adding the coating slurry into a coating storage device;

[0094] The ceramic antenna cover 6 is sleeved on the outside of the support device of the rotating fixed unit, and the ceramic antenna cover 6 is interference-connected with the support device; the interference-connection process of the ceramic antenna cover 6 and the support device includes the following steps:

[0095] The ceramic antenna cover 6 is sleeved on the outside of the first profiling tooling 7 and the second profiling tooling 8, the ceramic antenna cover 6 is vertically arranged, and the first profiling tooling 7 is located at the end opening of the ceramic antenna cover 6; the interior of the ceramic antenna cover 6 and the supporting device form an accommodating space;

[0096] Open the vacuum pump 13 and the second control valve 12 to extract the gas in the accommodating space through the gas outlet 10 of the gas outlet pipeline in the accommodating space to reduce the gas pressure in the accommodating space;

[0097] The first elastic contour support portion sleeved on the outside of the first tooling body expands under negative pressure to achieve interference connection between the first contouring tooling 7 and the inner wall of the ceramic antenna cover 6;

[0098] A first enclosed accommodation space formed by the interior of the ceramic antenna cover 6 and the supporting device;

[0099] The frequency converter 14 controls the vacuum pump 13 to control the negative pressure in the first closed accommodating space to be -0.045 MPa.

[0100] The negative pressure control unit inside the cover body sets the negative pressure inside the first closed accommodation space formed by the interior of the ceramic antenna cover 6 and the supporting device to a preset negative pressure range; the rotation of the ceramic antenna cover 6 is controlled by the rotating fixing unit;

[0101] The spraying device of the spraying system is controlled by the second transmission device 4 of the spraying system of the spraying unit to reciprocate in the vertical direction, and the spraying device sprays the coating slurry onto the surface of the ceramic antenna cover 6; the second transmission device 4 of the spraying system of the spraying unit controls the spray gun 5 outlet movement trajectory of the spraying device to reciprocate from top to bottom along a direction parallel to the outer surface of the antenna cover, and the spray gun 5 outlet movement speed v, the ceramic antenna cover 6 rotation speed ω, and the height h of the spray gun 5 outlet from the large end of the ceramic antenna cover 6 are controlled according to the equation curve;

[0102] The specific equation curve formula is: v = 0.5*ω*(h / H+a);

[0103] ω is set to 13r / min; H is the height of the radome; a is the adjustment coefficient, and a is set to between 1.8;

[0104] The outlet pressure of the spray gun 5 is 0.12 MPa; the negative pressure inside the first closed accommodating space is controlled at -0.075 MPa.

[0105] The coating slurry is coated on the surface of the ceramic radome 6 .

[0106] Embodiment 2:

[0107] The same contents as those in Example 1 are not described in detail here. The differences between this embodiment and Example 1 are as follows:

[0108] On the other hand, the present embodiment discloses a method for spraying a protective coating on a ceramic radome, wherein a ceramic radome protective coating spraying device is used to spray a ceramic radome 6; the method specifically comprises the following steps: preparing a coating slurry; the coating slurry comprises a silicone-containing resin, a bonding resin, a solvent, and a ceramic powder in a mass ratio of 45:18:28:28; the silicone-containing resin comprises a phenyl silicone resin;

[0109] The bonding resin includes acrylic resin;

[0110] The solvent includes ethanol and propanol; the ceramic powder includes boron nitride powder;

[0111] The coating slurry viscosity is 146 mPa.s.

[0112] The first elastic contoured support portion sleeved on the outside of the first tooling body expands under negative pressure, thereby achieving interference fit between the first contoured tooling 7 and the inner wall of the ceramic antenna cover 6; the first enclosed accommodating space is formed between the interior of the ceramic antenna cover 6 and the supporting device; the vacuum pump 13 is controlled by the frequency converter 14 to control the negative pressure in the first enclosed accommodating space to -0.048MPa.

[0113] The specific equation curve formula is: v = 0.5*ω*(h / H+a);

[0114] ω is set to 10r / min; H is the height of the radome; a is the adjustment coefficient, and a is set between 2.6;

[0115] The outlet pressure of the spray gun 5 is 0.08-0.3 MPa; the negative pressure inside the first closed accommodating space is controlled at -0.078 MPa.

[0116] Embodiment 3:

[0117] The same contents as those in Example 1 are not described in detail here. The differences between this embodiment and Example 1 are as follows:

[0118] On the other hand, this embodiment invents a method for spraying a protective coating on a ceramic radome, in which a ceramic radome protective coating spraying device is used to spray the ceramic radome 6; specifically, the following steps are included: preparing a coating slurry; the coating slurry includes a silicone-containing resin, a bonding resin, a solvent, and a ceramic powder in a mass ratio of 22:12:15:22; the silicone-containing resin includes methyl silicone resin and phenyl silicone resin; the bonding resin includes epoxy resin and acrylic resin; the solvent includes ethyl acetate and toluene; the ceramic powder includes silicon micropowder and boron nitride powder; the coating slurry has a viscosity of 135mPa.s.

[0119] The first elastic contour support portion sleeved on the outside of the first tooling body expands under negative pressure to achieve interference connection between the first contouring tooling 7 and the inner wall of the ceramic antenna cover 6;

[0120] A first enclosed accommodation space formed by the interior of the ceramic antenna cover and the supporting device;

[0121] The frequency converter 14 controls the vacuum pump 13 to control the negative pressure in the first closed accommodating space to -0.046 MPa.

[0122] The specific equation curve formula is: v = 0.5*ω*(h / H+a);

[0123] ω is set to 18r / min; H is the height of the radome; a is the adjustment coefficient, and a is set between 1.2;

[0124] The outlet pressure of the spray gun 5 is 0.09 MPa; the negative pressure inside the first closed accommodating space is controlled at -0.076 MPa.

[0125] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A ceramic radome protective coating spraying device, characterized in that: include: Rotating fixing unit, spraying unit, and negative pressure control unit inside the cover; The rotating and fixing unit comprises a supporting device and a first power device; During spraying, the ceramic antenna cover is sleeved on the outside of the supporting device; the inside of the ceramic antenna cover and the supporting device form a first closed accommodating space; The spraying unit includes a spraying system and a second transmission device connected to the spraying system; The injection system includes an injection device; the outlet of the injection device is arranged opposite to the antenna cover sleeved on the outside of the supporting device; The negative pressure control unit inside the cover body comprises an air outlet pipeline, and the air outlet of the air outlet pipeline is located in the first closed accommodating space.

2. The ceramic radome protective coating spraying device according to claim 1 is characterized in that: The supporting device comprises a first profiling tool, a second profiling tool, and a transmission connecting rod; The first profiling device comprises a first tooling body and a first elastic profiling support portion sleeved outside the first tooling body; the first elastic profiling support portion is made of elastic material, and the outer surface of the first elastic profiling support portion is designed to be profiling with the outer surface of the large end of the ceramic antenna cover opening; The second profiling device includes a second tooling body and a second elastic profiling support portion sleeved on the outside of the second tooling body; the second elastic profiling support portion is made of elastic material, and the outer surface of the contact portion between the ceramic antenna cover and the second elastic profiling support portion is designed to be contoured with the outer surface of the second elastic profiling support portion.

3. The ceramic radome protective coating spraying device according to claim 1, characterized in that: The first profiling tool and the second profiling tool are arranged in parallel, and the transmission connecting rod is arranged perpendicular to the first profiling tool; the first profiling tool and the second profiling tool are sleeved outside the transmission connecting rod; One end of the transmission connecting rod away from the first profiling tooling and the second profiling tooling is connected to the first power device through the first transmission device or directly.

4. The ceramic radome protective coating spraying device according to claim 1, characterized in that: The spraying unit also includes an air source, a pressure reducing valve, and a first control valve; The gas source is connected to the pressure reducing valve through the gas pipeline, the pressure reducing valve is connected to the first control valve through the gas pipeline, and the first control valve is connected to the injection device through the gas pipeline; The spraying device includes a spray gun and a paint storage device connected to the spray gun inlet; The first control valve is connected to the paint storage device through an air delivery pipeline.

5. The ceramic radome protective coating spraying device according to claim 1, characterized in that: The negative pressure control unit inside the cover body also includes a vacuum pump, a second control valve, a frequency converter, and a negative pressure sensor; The negative pressure sensor is arranged in the first closed accommodating space; The gas outlet pipeline is connected to the second control valve through the gas supply pipeline, and the second control valve is connected to the vacuum pump through the gas supply pipeline; the frequency converter is electrically connected to the vacuum pump.

6. A method for spraying a protective coating on a ceramic radome, characterized in that: Spraying the ceramic radome with the ceramic radome protective coating spraying device according to any one of claims 1 to 5; The specific steps include: preparing a coating slurry; adding the coating slurry into a coating storage device; The ceramic antenna cover is sleeved on the outside of the supporting device of the rotating and fixing unit, and the ceramic antenna cover is interference-connected with the supporting device; The negative pressure inside the first closed accommodating space formed by the interior of the ceramic antenna cover and the supporting device is set within a preset negative pressure range by means of a negative pressure control unit inside the cover body; The ceramic radome is controlled to rotate by a rotating fixing unit; The spraying device of the spraying system is controlled to reciprocate in the vertical direction by the second transmission device of the spraying system of the spraying unit, and the spraying device sprays the coating slurry onto the surface of the ceramic radome; A coating slurry is applied to the surface of the ceramic radome.

7. The method for spraying a protective coating on a ceramic radome according to claim 6, characterized in that: The coating slurry comprises a silicon-containing resin, a bonding resin, a solvent, and a ceramic powder in a mass ratio of (20-50):(10-20):(10-30):(20-30); The silicon-containing resin includes one or two of methyl silicone resin and phenyl silicone resin; The bonding resin includes one or more of epoxy resin and acrylic resin; The solvent includes one or more of ethanol, propanol, ethyl acetate, and toluene; The ceramic powder includes one or two of silicon micropowder and boron nitride powder; The particle size of the ceramic powder is ≤6 microns; The coating slurry has a viscosity of 30-150 mPa.s.

8. The method for spraying a protective coating on a ceramic radome according to claim 6, characterized in that: The process of interference connecting the ceramic radome and the supporting device comprises the following steps: The ceramic radome is sleeved on the outside of the first profiling tooling and the second profiling tooling, the ceramic radome is vertically arranged, and the first profiling tooling is located at the end opening of the ceramic radome; the interior of the ceramic radome and the supporting device form an accommodating space; Turning on the vacuum pump and the second control valve to extract the gas in the accommodating space through the gas outlet of the gas outlet pipeline in the accommodating space to reduce the gas pressure in the accommodating space; The first elastic contour support portion sleeved on the outside of the first tooling body expands under a negative pressure environment to achieve interference connection between the first contouring tooling and the inner wall of the ceramic antenna cover; A first enclosed accommodation space formed by the interior of the ceramic antenna cover and the supporting device; The vacuum pump is controlled by a frequency converter to control the negative pressure in the first closed accommodating space to be -0.05MPa to -0.04MPa.

9. The method for spraying a protective coating on a ceramic radome according to claim 6, characterized in that: When the second transmission device of the spray system of the spray unit controls the spray device of the spray system to reciprocate in the vertical direction, the negative pressure inside the first closed accommodating space is controlled at -0.08 MPa to -0.07 MPa.

10. The method for spraying a protective coating on a ceramic radome according to claim 6, characterized in that: The second transmission device of the spray system of the spray unit controls the spray gun outlet movement trajectory of the spray device to reciprocate from top to bottom along the outer surface of the antenna cover parallel to the antenna cover, and the spray gun outlet movement speed v, the ceramic antenna cover rotation speed ω, and the height h of the spray gun outlet from the large end of the ceramic antenna cover are controlled according to the equation curve; The specific equation curve formula is: v = 0.5*ω*(h / H+a); ω is set to 5-20r / min; H is the height of the antenna cover; a is the adjustment coefficient, and a is set between 0.5-3; The outlet pressure of the spray gun is 0.08-0.3MPa.

Images