A head thermal insulation layer forming device, a forming method and an engine head thermal insulation layer

Abstract

This invention relates to the field of solid rocket head insulation layer technology, and discloses a head insulation layer forming device, forming method, and engine head insulation layer. The head insulation layer forming device includes a forming module and a spraying module. The forming module includes a turntable and a mold. The turntable can rotate around its axis, and the mold can be supported on the turntable and rotate coaxially with the turntable. A head insulation layer forming surface is formed on the mold. The spraying module includes a drive mechanism and a spraying component. The spraying component is connected to the output end of the drive mechanism. The drive mechanism can drive the spraying component to move along a preset trajectory. The spraying component can spray a preset insulation coating onto the head insulation layer forming surface to form the insulation layer. The head insulation layer forming method includes: setting the parameters of the spraying component and the rotation speed of the turntable; forming an elastic layer; forming a heat insulation layer; forming an erosion-resistant layer; forming an adapting layer; and curing to obtain the head insulation layer. The engine head insulation layer is obtained by the above method. The forming efficiency is high, and the quality consistency is good.

Description

Technical Field

[0001] This invention relates to the field of solid rocket head insulation layer technology, and in particular to a head insulation layer forming device, forming method and engine head insulation layer. Background Technology

[0002] The thermal insulation layer of a solid rocket motor is located between the propellant and the engine casing, providing excellent thermal protection for the engine casing and ensuring the normal operation of the spacecraft. Existing solid rocket motor head insulation structures are simple. Engines operating in harsh ablation environments typically increase the thickness of the insulation structure to improve reliability; however, this reduces the internal propellant loading space and also increases the negative mass of the insulation structure, shortening the missile's range. Furthermore, existing solid rocket motor head insulation structures are usually formed using a manual application process, where insulation sheets are laid into a mold. This process is characterized by low automation, low forming efficiency, and poor quality consistency.

[0003] Therefore, there is an urgent need for a head insulation layer forming device, forming method, and engine head insulation layer to solve the above problems. Summary of the Invention

[0004] Based on the above, the purpose of this invention is to provide a head insulation layer forming device, forming method, and engine head insulation layer, which has high forming efficiency, good quality consistency, and good thermal protection effect while ensuring missile range.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for forming a heat insulation layer for a head, comprising:

[0007] A molding module includes a turntable and a mold. The turntable can rotate around its axis, and the mold can be supported on the turntable and rotate coaxially with the turntable. A head insulation layer molding surface is formed on the mold.

[0008] The spraying module includes a drive mechanism and a spraying component. The spraying component is connected to the output end of the drive mechanism. The drive mechanism can drive the spraying component to move along a preset trajectory. The spraying component can spray a preset heat-insulating coating onto the heat insulation layer forming surface of the end cap to form a heat insulation layer.

[0009] As a preferred embodiment of a head insulation layer forming device, the driving mechanism includes:

[0010] A bracket is located on one side of the molding module. The bracket includes a base and a support rod. The support rod is movably mounted on the base and can move closer to or further away from the molding module.

[0011] A robotic arm is mounted on the support rod, and the sprayed part is connected to the drive end of the robotic arm.

[0012] As a preferred embodiment of a head insulation layer forming device, it also includes:

[0013] A thickness gauge is connected to the output end of the drive mechanism and can move synchronously with the sprayed part. The thickness gauge can measure the thickness of the insulation layer at a preset position.

[0014] A method for forming a heat insulation layer for a head, based on the head heat insulation layer forming apparatus described in any of the above technical solutions, the method comprising the following steps:

[0015] The parameters of the sprayed part and the rotation speed of the turntable are set according to the size of the insulation layer to be formed;

[0016] The elastic insulating slurry is sprayed onto the forming surface of the end cap insulation layer through the spraying component to a first preset thickness to form an elastic layer.

[0017] The heat insulation slurry is sprayed onto the elastic layer by the spraying component to a second preset thickness to form a heat insulation layer;

[0018] The anti-erosion insulation slurry is sprayed onto the heat insulation layer by the spraying component to a third preset thickness to form an anti-erosion layer.

[0019] The heat-insulating slurry is applied to the anti-erosion layer by the spraying component to a fourth preset thickness to form an adaptation layer.

[0020] The curing process yields the end cap insulation layer.

[0021] In a preferred embodiment of a method for forming a heat insulation layer for a head, the thickness of the elastic layer accounts for 2% to 5% of the thickness of the heat insulation layer, the heat insulation layer accounts for 20% to 50% of the thickness of the heat insulation layer, the erosion-resistant layer accounts for 40% to 60% of the thickness of the heat insulation layer, and the adapting layer accounts for 2% to 5% of the thickness of the heat insulation layer.

[0022] As a preferred embodiment of the end cap insulation layer forming method, the application of the elastic insulation slurry, the thermal insulation slurry, the erosion-resistant insulation slurry, and the adaptable insulation slurry is divided into multiple sprayings. After each spraying, the thickness is measured by a thickness gauge. If the thickness at a certain point is found to be less than the preset thickness, the coating is applied by the spraying tool.

[0023] In a preferred embodiment of a method for forming a heat insulation layer on a head, when the turntable drives the mold to rotate at a preset speed, the drive mechanism drives the sprayed part to move along the generatrix of the mold and sprays the preset heat insulation coating. The spraying pattern of the sprayed part is determined according to the following formula:

[0024]

[0025] Wherein, S is the spray mist width of the sprayed part, in mm; V1 is the travel speed of the sprayed part along the generatrix of the mold, in mm / s; D is the diameter of the forming surface of the end cap insulation layer at the spraying position, in mm; and V2 is the rotational linear velocity of the mold at the spraying position, in mm / s.

[0026] As a preferred embodiment of a method for forming a heat insulation layer for a head, the elastic heat insulation slurry is prepared by mixing a base adhesive, reinforcing filler, and tackifier; the thermal insulation slurry is prepared by mixing a base adhesive, reinforcing filler, and lightweight filler; the erosion-resistant heat insulation slurry is prepared by mixing a base adhesive, reinforcing filler, special fibers, and erosion-resistant filler; and the adaptable heat insulation slurry is prepared by mixing a base adhesive, reinforcing filler, low-modulus additive, and tackifier.

[0027] As a preferred embodiment of the end cap insulation layer forming method, the base adhesives in the elastic insulation slurry, the thermal insulation slurry, the erosion-resistant insulation slurry, and the adaptable insulation slurry are of the same type.

[0028] An engine head insulation layer is prepared by the head insulation layer forming method described in any of the above technical solutions.

[0029] The beneficial effects of this invention are as follows:

[0030] This invention provides a device for forming a heat insulation layer on a head. The device includes a forming module and a spraying module. A turntable rotates, driving a mold to rotate, and a spraying component moves along a preset trajectory, allowing the heat insulation coating sprayed from the component to coat the mold and form a heat insulation layer. Furthermore, the spraying component does not need to continuously rotate around the mold to spray the heat insulation coating circumferentially, improving spraying convenience and reliability. Forming the heat insulation layer on the mold by spraying results in a high degree of automation, high forming efficiency, and good quality consistency.

[0031] This invention also provides a method for forming a heat insulation layer on a head. By setting the parameters of the sprayed part and the rotation speed of the turntable, the heat insulation coating sprayed from the sprayed part can form a uniform heat insulation layer on the mold. Different slurries are applied layer by layer to form an elastic layer, a heat insulation layer, an anti-erosion layer, and an adapting layer. The elastic layer facilitates good adhesion to the engine casing; the heat insulation layer has good heat insulation performance and can resist the transmission of high temperatures to the casing; the anti-erosion layer has good erosion resistance and can resist the erosion of high-temperature, high-speed particle streams generated by propellant combustion; the adapting layer has good adhesion performance, can form good adhesion to the propellant, and can avoid stress concentration problems caused by propellant shrinkage. The heat insulation layer formed by this method can achieve thermal protection for the engine without increasing the total thickness of the heat insulation layer, avoiding the problems of reduced internal propellant loading space and increased negative weight caused by existing methods, which could shorten missile range.

[0032] The present invention also provides an engine head insulation layer, which is made by the above-mentioned head insulation layer forming method. The layered arrangement gives the engine head insulation layer a number of advantages and can achieve thermal protection of the engine without increasing the total thickness of the insulation layer. This avoids the problems of reduced internal propellant space and increased negative weight caused by existing methods, which in turn shorten the missile range. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the head insulation layer forming device provided in an embodiment of the present invention from a first perspective.

[0035] Figure 2 This is a schematic diagram of the head insulation layer forming device provided in an embodiment of the present invention from a second perspective.

[0036] Figure 3 This is the flow chart of the head insulation layer forming method provided in the embodiments of the present invention. Figure 1 ;

[0037] Figure 4 This is the flow chart of the head insulation layer forming method provided in the embodiments of the present invention. Figure 1 .

[0038] In the picture:

[0039] 1. Molding module; 11. Turntable; 12. Mold;

[0040] 2. Spraying module; 21. Drive mechanism; 211. Support; 212. Robotic arm; 22. Sprayed part;

[0041] 3. Thickness measuring parts. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0046] The thermal insulation layer of a solid rocket motor is located between the propellant and the engine casing, providing excellent thermal protection for the engine casing and ensuring the normal operation of the spacecraft. Existing solid rocket motor head insulation structures are typically formed using a manual application process. This process involves laying the insulation sheet into a mold, which suffers from low automation, low forming efficiency, and inconsistent quality.

[0047] Based on the above-mentioned technical problems, this embodiment provides a device for forming a heat insulation layer for a head, such as... Figure 1 and Figure 2 As shown, the end cap insulation layer forming device includes a forming module 1 and a spraying module 2. The forming module 1 includes a turntable 11 and a mold 12. The turntable 11 can rotate around its axis, and the mold 12 can be supported on the turntable 11 and can rotate coaxially with the turntable 11. The mold 12 forms the end cap insulation layer forming surface. The spraying module 2 includes a driving mechanism 21 and a spraying component 22. The spraying component 22 is connected to the output end of the driving mechanism 21. The driving mechanism 21 can drive the spraying component 22 to move along a preset trajectory. The spraying component 22 can spray a preset insulation coating onto the end cap insulation layer forming surface to form an insulation layer. By rotating the turntable 11, the mold 12 rotates, and by the spraying component 22 moving along the preset trajectory, the insulation coating sprayed by the spraying component 22 is coated on the mold 12 to form an insulation layer. Moreover, the spraying component 22 does not need to rotate around the mold 12 continuously to spray the insulation coating in the circumferential direction of the mold 12, improving the convenience and reliability of spraying. The process of forming an insulating layer by spraying onto the mold 12 results in a high degree of automation, high molding efficiency, and good quality consistency. It should be noted that the mold 12 can be either a male or female mold. For example, when it is a female mold, the coating material 22 is sprayed onto the inner surface of the mold 12 to form the insulating layer. Preferably, the mold 12 is made of metal, which is not easily deformed and has high structural strength.

[0048] Preferably, a release layer is provided on the molding surface of the end heat insulation layer on the mold 12 to facilitate the release of the molded heat insulation layer from the mold 12 and ensure the integrity of the heat insulation layer after demolding. For example, the release layer is a polytetrafluoroethylene release coating.

[0049] Specifically, the drive mechanism 21 includes a bracket 211 and a robotic arm 212. The bracket 211 is located on one side of the molding module 1 and includes a base and a support rod. The support rod is movably mounted on the base and can move closer to or further away from the molding module 1. The robotic arm 212 is mounted on the support rod, and the spraying part 22 is connected to the drive end of the robotic arm 212. In this embodiment, the support rod is movably mounted on the base along the radial direction of the turntable 11. The movement of the support rod drives the robotic arm 212 to move closer to or further away from the mold 12 along the radial direction of the turntable 11, thereby causing the spraying part 22 driven by the robotic arm 212 to move closer to or further away from the mold 12, so as to adjust the distance between the spraying part 22 and the mold 12, increase the adjustment range of the spraying part 22, and facilitate the removal of the insulation layer after molding. Preferably, the robotic arm 212 is a three-degree-of-freedom or six-degree-of-freedom robotic arm 212, capable of driving the spraying part 22 to translate and rotate in the X-axis, Y-axis, and Z-axis directions, thereby enabling the spraying part 22 to align with the mold 12 as required and move along a preset trajectory to ensure spraying accuracy. The spraying part 22 may be, but is not limited to, a spray gun.

[0050] For example, a guide rail is provided on the base along the radial direction of the turntable 11. The support rod is moved on the guide rail by a slider. The sliding cooperation between the guide rail and the slider makes the position adjustment of the support rod relatively stable and smooth, ensuring the positional accuracy of the sprayed part 22. A driving component is provided on the base. The driving component drives the connected slider or the support rod to drive the support rod to move radially along the turntable 11. The driving component can be, but is not limited to, a driving cylinder, or it can be a motor and a lead screw structure, etc., depending on the actual needs. Since the motor-driven lead screw structure is a relatively mature existing technology, it will not be described in detail here.

[0051] More specifically, the spraying module 2 also includes a storage tank and a delivery pump. The storage tank is used to hold the insulation slurry, and its outlet is connected to the inlet of the spray gun via a pipe. The delivery pump is installed in the pipe and is used to pump the insulation slurry into the spray gun. Preferably, the delivery pump is equipped with a pressure gauge to monitor the pressure in the pipe so as to adjust the pumping speed of the delivery pump in a timely manner.

[0052] Preferably, the storage tank is equipped with a stirring element, which is used to stir the insulating slurry in the storage tank to prevent the insulating slurry from clumping and affecting normal transportation and spraying. The stirring element can be a stirring rod with stirring spiral blades.

[0053] Furthermore, the molding module 1 also includes a power source, which drives the turntable 11 to rotate. For example, the power source is a motor, the turntable 11 is connected to the drive end of the motor, and a positioning post is protruding on the turntable 11. The positioning post extends along the central axis of the turntable 11, and a positioning hole is provided on the mold 12. The positioning post can pass through the positioning hole. The positioning post and the positioning hole cooperate to realize the limiting connection between the mold 12 and the turntable 11, so as to avoid the mold 12 from shifting position on the turntable 11 and affecting the molding yield of the insulation layer.

[0054] Preferably, the turntable 11 is provided with multiple limiting members, which are spaced apart along the circumference of the mold 12 and can clamp or release the mold 12 to limit and fix the mold 12 on the turntable 11, thus ensuring that the mold 12 rotates synchronously with the turntable 11. For example, the limiting members include a drive cylinder and a clamping plate. The drive cylinder can drive the clamping plate to move along the turntable 12 to abut against or move away from the mold 12. At least one limiting member is provided on each of the opposite sides of the mold 12. The clamping of the mold 12 can be achieved through the relatively arranged limiting members, ensuring that the mold 12 rotates synchronously with the turntable 11. That is, the rotational speed of the mold 12 can be controlled by controlling the output speed of the motor, making the thickness of the insulation layer controllable during spraying.

[0055] Furthermore, the end cap insulation layer forming device also includes a thickness gauge 3, which is connected to the output end of the drive mechanism 21 and can move synchronously with the spraying component 22. The thickness gauge 3 can measure the thickness of the insulation layer at a preset position. After the insulation slurry is sprayed onto the mold 12, the thickness gauge 3 is driven to move by the robotic arm 212, so that the thickness gauge 3 can detect the thickness at the preset measurement position, for example, measuring the thickness at preset distances along the circumference or at preset distances along the generatrix of the mold 12. If the thickness at the measured position is not up to standard, the spraying component 22 is activated to re-coat the position. Each re-coat is applied in small amounts, and multiple measurements are taken until the thickness at the re-coated position meets the standard. The thickness gauge and the spraying component 22 are both located at the drive end of the robotic arm 212 and can move synchronously, making re-coating convenient and highly accurate.

[0056] Preferably, the thickness measuring element 3 is a photothermal non-contact thickness gauge to avoid damage to the insulation layer during measurement.

[0057] In this embodiment, the turntable 11 rotates, and the sprayed part 22 travels along the generatrix of the mold 12. It is necessary to control the traveling speed of the sprayed part 22, the rotation speed of the mold 12, and the spray mist width to match. Based on multiple spraying experiences, the following rules have been summarized:

[0058]

[0059] Wherein, S is the spray mist width of the sprayed part 22, in mm; V1 is the travel speed of the sprayed part along the generatrix of the mold 12, in mm / s; D is the diameter of the forming surface of the insulation layer of the end cap at the spraying position, in mm; and V2 is the rotational linear velocity of the mold 12 at the spraying position, in mm / s.

[0060] In this embodiment, the end cap insulation layer forming device also includes a control module. The control module is communicatively connected to the drive unit, robotic arm 212, spraying component 22, conveying pump, motor driving the turntable 11, and thickness measuring component 3. The control module controls the start and stop of the drive unit, the position of the robotic arm 212, the start and stop of the spraying component 22, the pumping speed of the conveying pump, the rotation speed of the turntable 11, and the start and stop of the thickness measuring component 3. This is convenient, fast, and highly accurate. The control module includes a PLC programmable controller and a display. The display shows the thickness measurement data of the thickness measuring component 3 and the operating data of each component, allowing operators to intuitively understand the operating status and make timely adjustments. It should be noted that the controller can be a centralized or distributed controller. For example, the controller can be a single microcontroller or composed of multiple distributed microcontrollers, and the microcontroller can run the control program.

[0061] like Figure 3 and Figure 4 As shown, this embodiment also provides a method for forming a head insulation layer, based on the above-mentioned head insulation layer forming device, which specifically includes the following steps:

[0062] S100: Set the parameters of the sprayed part 22 and the rotation speed of the turntable 11 according to the size of the insulation layer to be formed. When the turntable 11 rotates, the sprayed part 22 travels and sprays along the generatrix direction of the mold 12, so that a uniform insulation layer is formed on the end heat insulation layer forming surface of the mold 12, specifically according to the following rules:

[0063]

[0064] Wherein, S is the spray mist width of the sprayed part 22, in mm; V1 is the travel speed of the sprayed part along the generatrix of the mold 12, in mm / s; D is the diameter of the forming surface of the insulation layer of the end cap at the spraying position, in mm; and V2 is the rotational linear velocity of the mold 12 at the spraying position, in mm / s.

[0065] S200: An elastic insulating slurry is sprayed onto the forming surface of the end cap insulation layer through the spraying component 22 to a first preset thickness, forming an elastic layer. The thickness of the elastic layer accounts for 2% to 5% of the thickness of the end cap insulation layer. The elastic layer is composed of a base adhesive, reinforcing filler, and tackifier, possessing high strength and good adhesion, and can form a good bond with the engine housing, thus improving the connection strength between the insulation layer and the engine housing. For example, the base adhesive can be one or more of liquid silicone rubber, liquid polyurethane rubber, liquid nitrile rubber, liquid EPDM rubber, liquid butadiene rubber, and liquid polysulfide rubber, and can be diluted with a solvent to a coating state, suitable for automatic spraying processes; the reinforcing material can be one or more of fumed silica, precipitated silica, and light calcium carbonate; the tackifier is one or more of silane coupling agents, titanate coupling agents, and borosilicate tackifiers.

[0066] S300: A heat-insulating slurry is sprayed onto the elastic layer using the spraying component 22 to a second preset thickness, forming a heat-insulating layer. The heat-insulating layer comprises 20% to 50% of the thickness of the end cap's heat-insulating layer. The heat-insulating layer is made by mixing a base adhesive, reinforcing filler, and lightweight filler, and has the advantages of low density and good heat insulation performance, resisting the transfer of high temperatures to the shell. Exemplarily, the lightweight filler is one or more of the following: glass hollow microspheres, ceramic hollow microspheres, phenolic microspheres, vitrified microspheres, and carbon spheres.

[0067] S400: An anti-erosion insulation slurry is sprayed onto the insulation layer through the spraying component 22 to a third preset thickness, forming an anti-erosion layer. This anti-erosion layer comprises 40% to 60% of the thickness of the head insulation layer. It is composed of a base adhesive, reinforcing filler, and special fibers, possessing advantages such as ablation resistance and erosion resistance, and can withstand the erosion caused by the high-temperature, high-speed particle flow generated by propellant combustion. Exemplarily, the special fibers are one or more of carbon fiber, quartz fiber, high-silica fiber, mullite fiber, polyimide fiber, aramid fiber, and polybenzimidazole fiber.

[0068] S500: An insulating slurry is applied to the erosion-resistant layer using the spraying component 22 to a fourth preset thickness, forming an adapter layer. This adapter layer comprises 2% to 5% of the head's insulating layer thickness. It is composed of a base adhesive, reinforcing filler, low-modulus additive, and tackifier, offering advantages such as low modulus and good adhesion. It can form a good bond with the propellant and avoid stress concentration problems caused by propellant shrinkage. For example, the low-modulus additive includes polydimethylsiloxane.

[0069] S600: Curing yields the end cap insulation layer. For example, curing at room temperature for 72 hours or more, or at 150°C for 4 hours, depending on the material properties.

[0070] By setting the parameters of the sprayed part 22 and the rotation speed of the turntable 11, the heat-insulating coating sprayed by the sprayed part 22 can form a uniform heat-insulating layer on the mold 12. Furthermore, by applying different slurries layer by layer through the sprayed part 22 to form an elastic layer, a heat-insulating layer, an erosion-resistant layer, and an adapting layer, thermal protection of the engine can be achieved without increasing the total thickness of the heat-insulating layer. This avoids the problems of reduced internal propellant space and increased negative weight associated with existing methods, which could shorten missile range. Simultaneously, the thickness ratio of each layer can be adjusted according to actual needs to meet different design requirements. For example, if better heat insulation is required, the thickness of the heat insulation layer can be appropriately increased while the thickness of other layers is reduced. If better erosion resistance is required, the thickness of the erosion-resistant layer can be appropriately increased while the thickness of other layers is reduced. This provides good flexibility and practicality.

[0071] Preferably, the base adhesives in the elastic insulating grout, thermal insulation grout, erosion-resistant insulating grout, and compatible insulating grout are of the same type, which can improve the compatibility between the functional layers and thus improve the overall quality of the insulation layer.

[0072] like Figure 4 As shown, specifically, in step S100, after setting the parameters of the sprayed part 22 and the rotation speed of the turntable 11, the method further includes step S101: installing the mold 12 onto the turntable 11 and installing the metal connector of the engine head into the mold 12, for example by bolt connection, and then starting the motor that drives the turntable 11 to rotate, so that the turntable 11 rotates and drives the mold 12 to rotate.

[0073] More specifically, step S200 includes:

[0074] Step S201: Add elastic insulating slurry to the storage tank, drive the agitator to stir, and start the robotic arm 212 and the spraying component 22. Preferably, the spraying process is divided into multiple sprays, that is, each spray is a small thickness, and the spraying thickness is achieved through multiple sprays, avoiding the scrapping due to excessive spraying thickness in a single spray, and making it easier to control the thickness accuracy.

[0075] Step S202: After each two coats, start the thickness measuring device 3 and the thickness measuring program to measure the thickness of the elastic layer until the thickness of the elastic layer reaches the preset thickness. In areas where the preset thickness has not been reached, apply additional coating to make the area reach the preset thickness.

[0076] Step S300 specifically includes:

[0077] Step S301: Add heat-insulating slurry to the storage tank, drive the agitator to stir, and start the robotic arm 212 and the spraying component 22. Preferably, the spraying process is divided into multiple sprays, that is, each spray is a small thickness, and the spraying thickness is achieved through multiple sprays, avoiding the scrapping due to excessive spraying thickness in a single spray, and making it easier to control the thickness accuracy.

[0078] Step S302: After each two coats, start the thickness measuring part 3 and the thickness measuring program to measure the thickness until the thickness reaches the preset thickness. Then, apply a touch-up coat to areas where the preset thickness has not been reached to make the preset thickness reach that area.

[0079] Step S400 specifically includes:

[0080] Step S401: Add anti-erosion and heat-insulating slurry to the storage tank, drive the agitator to stir, and start the robotic arm 212 and the spraying component 22. Preferably, the spraying process is divided into multiple sprays, that is, each spray is a small thickness, and the spraying thickness is achieved through multiple sprays, avoiding the scrapping due to excessive spraying thickness in a single spray, and making it easier to control the thickness accuracy.

[0081] Step S402: After each two coats, start the thickness measuring part 3 and the thickness measuring program to measure the thickness until the thickness reaches the preset thickness. In areas where the preset thickness has not been reached, apply additional coating to make the area reach the preset thickness.

[0082] Step S500 specifically includes:

[0083] Step S501: Add suitable insulating slurry to the storage tank, drive the agitator to stir, and start the robotic arm 212 and the spraying component 22. Preferably, the spraying process is divided into multiple sprays, that is, each spray is a small thickness, and the spraying thickness is achieved through multiple sprays, avoiding the scrapping due to excessive spraying thickness in a single spray, and making it easier to control the thickness accuracy.

[0084] Step S502: After each two coats, start the thickness measuring part 3 and the thickness measuring program to measure the thickness until the thickness reaches the preset thickness. Then, apply a touch-up coat to areas where the preset thickness has not been reached to make the preset thickness reach that area.

[0085] In this embodiment, for engine heads of different diameters, when forming the insulation layer of the head, it is only necessary to change the mold 12 and run the corresponding spraying and thickness measurement program.

[0086] This embodiment also provides an engine head insulation layer, which is made by the above-mentioned head insulation layer forming method. The layered arrangement gives the engine head insulation layer a variety of advantages and can achieve thermal protection of the engine without increasing the total thickness of the insulation layer. This avoids the problems of reduced internal propellant space and increased negative weight caused by existing methods, which in turn shorten the missile range.

[0087] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for forming a head insulation layer based on a head insulation layer forming device, characterized in that, The end cap insulation layer forming device includes: A molding module includes a turntable and a mold. The turntable can rotate around its axis, and the mold can be supported on the turntable and rotate coaxially with the turntable. A head insulation layer molding surface is formed on the mold. The spraying module includes a drive mechanism and a spraying component. The spraying component is connected to the output end of the drive mechanism. The drive mechanism can drive the spraying component to move along a preset trajectory. The spraying component can spray a preset heat-insulating coating onto the heat insulation layer forming surface of the end cap to form a heat insulation layer. The method for forming the end cap insulation layer includes the following steps: The parameters of the sprayed part and the rotation speed of the turntable are set according to the size of the insulation layer to be formed; The elastic insulating slurry is sprayed onto the forming surface of the end cap insulation layer through the spraying component to a first preset thickness to form an elastic layer. The heat insulation slurry is sprayed onto the elastic layer by the spraying component to a second preset thickness to form a heat insulation layer; The anti-erosion insulation slurry is sprayed onto the heat insulation layer by the spraying component to a third preset thickness to form an anti-erosion layer. The heat-insulating slurry is applied to the anti-erosion layer by the spraying component to a fourth preset thickness to form an adaptation layer. The end cap insulation layer is obtained after curing; When the turntable drives the mold to rotate at a preset speed, the drive mechanism drives the sprayed part to move along the generatrix of the mold and sprays the preset heat-insulating coating. The spraying pattern of the sprayed part is determined according to the following formula: ， Wherein, S is the spray mist width of the sprayed part, in mm; V1 is the travel speed of the sprayed part along the generatrix of the mold, in mm / s; D is the diameter of the forming surface of the end cap insulation layer at the spraying position, in mm; V2 is the rotational linear velocity of the mold at the spraying position, in mm / s. The elastic layer accounts for 2% to 5% of the thickness of the end cap insulation layer, the heat insulation layer accounts for 20% to 50% of the thickness of the end cap insulation layer, the erosion-resistant layer accounts for 40% to 60% of the thickness of the end cap insulation layer, and the adapter layer accounts for 2% to 5% of the thickness of the end cap insulation layer; The elastic thermal insulation mortar is made by mixing a base adhesive, reinforcing filler, and tackifier; the thermal insulation mortar is made by mixing a base adhesive, reinforcing filler, and lightweight filler; the erosion-resistant thermal insulation mortar is made by mixing a base adhesive, reinforcing filler, special fibers, and erosion-resistant filler; the adaptable thermal insulation mortar is made by mixing a base adhesive, reinforcing filler, low-modulus additive, and tackifier. The base rubber includes one or more of liquid silicone rubber, liquid polyurethane rubber, liquid nitrile rubber, liquid EPDM rubber, liquid butadiene rubber, and liquid polysulfide rubber; the reinforcing filler includes one or more of fumed silica, precipitated silica, and light calcium carbonate; the tackifier includes one or more of silane coupling agents, titanate coupling agents, and borosilicate tackifiers; the lightweight filler includes one or more of glass hollow microspheres, ceramic hollow microspheres, phenolic microspheres, vitrified microspheres, and carbon spheres; the special fibers include one or more of carbon fibers, quartz fibers, high-silica fibers, mullite fibers, polyimide fibers, aramid fibers, and polybenzimidazole fibers; and the low-modulus additive includes polydimethylsiloxane.

2. The method for forming the end cap insulation layer according to claim 1, characterized in that, The drive mechanism includes: A bracket is located on one side of the molding module. The bracket includes a base and a support rod. The support rod is movably mounted on the base and can move closer to or further away from the molding module. A robotic arm is mounted on the support rod, and the sprayed part is connected to the drive end of the robotic arm.

3. The method for forming the end cap insulation layer according to claim 1, characterized in that, The end cap insulation layer forming device also includes: A thickness gauge is connected to the output end of the drive mechanism and can move synchronously with the sprayed part. The thickness gauge can measure the thickness of the insulation layer at a preset position.

4. The method for forming the end cap insulation layer according to claim 1, characterized in that, When spraying the elastic thermal insulation slurry, the thermal insulation slurry, the erosion-resistant thermal insulation slurry, and the adaptable thermal insulation slurry, each is sprayed in multiple coats. After each coat, the thickness is measured using a thickness gauge. If the thickness at a certain point is found to be less than the preset thickness, the coating is applied again using the sprayed part.

5. The method for forming the end cap insulation layer according to claim 4, characterized in that, The base adhesives in the elastic thermal insulation grout, the thermal insulation grout, the erosion-resistant thermal insulation grout, and the adaptable thermal insulation grout are of the same type.

6. An engine head insulation layer, characterized in that, It is prepared by the head insulation layer forming method according to any one of claims 1-5.

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