Fragile cap assembly

Abstract

The application discloses a kind of fragile cover assemblies, the fragile cover assembly includes pressure frame, bottom frame and fragile cover, one end of fragile cover is connected with pressure frame, the other end of fragile cover is connected with bottom frame, groove and support are arranged on fragile cover, and the groove is connected with the support.This application is fixed and locked by assembly stopper to fragile cover assembly, and the circumferential assembly stopper is used for circumferential support and limiting to prevent the turning and sliding of fragile cover assembly.The bottom surface of the bottom plate of the inner cavity of the pressing plate ring and axial limiting can realize the full constraint of fragile cover assembly, and the assembly stopper and the fragile cover assembly can be completely sealed by the bottom surface of the bottom plate of the inner cavity of the pressing plate ring, so as to realize high-precision butt joint and ensure the safe separation of fragile cover and pressing plate.The fragile cover assembly separation device of the application has the advantages of simple structure, manufacturability, low cost, high safety, simple and fast operation, high efficiency and the like, which is beneficial to improve the production test efficiency.

Description

Technical Field

[0001] This invention belongs to the field of fragile lid technology, and particularly relates to a fragile lid assembly. Background Technology

[0002] With the ever-changing international situation, numerous studies on the structure and types of fragile composite covers have been conducted both domestically and internationally. Fragile covers protect aircraft from external damage during storage and transportation, and can also increase reaction time during launch. While fragile covers can be manufactured using rigid polyurethane chemical foaming, offering advantages such as simple operation, short molding cycle, and low cost, disassembly during high-temperature, low-temperature, damp-heat, and airtightness tests is labor-intensive and inefficient. Using tools for disassembly can easily create leakage channels, making precision difficult to guarantee and potentially puncturing and damaging the cover, rendering it unusable. Therefore, a device is needed to safely, conveniently, and accurately eject fragile covers to ensure their functionality and performance meet technical requirements and guarantee their quality.

[0003] Patent document CN116026185A discloses a planar segmented composite material fragile cover with a high external-to-internal load-bearing ratio, comprising a flange frame, a reinforcing frame, separate sub-lobes, segmented weak areas, and circumferential weak areas. The weak areas are formed by bonding composite laminates together. The reinforcing frame is designed to withstand large external loads and separate under smaller internal loads. This invention's fragile cover can withstand significant external pressure without damage when the missile is not launched, and can open in a segmented manner under a smaller load during missile launch, clearing a path for the missile. The weak areas of this invention's fragile cover differ from the grooved structure of this application; the grooves in this application are connected to the center point of the fragile cover, facilitating breakage from the center. This invention does not disclose related ejection components. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention provides a fragile cap assembly.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a fragile cover assembly, including a pressure frame, a bottom frame, and a fragile cover. One end of the fragile cover is connected to the pressure frame, and the other end of the fragile cover is connected to the bottom frame. The fragile cover is provided with a groove and a support portion, and the groove is connected to the support portion.

[0007] Preferably, the pressure frame and the bottom frame are both annular, the fragile cover is arched, and the grooves are symmetrically arranged around the center of the fragile cover.

[0008] Preferably, the pressure frame is provided with screw holes A, screw holes B and screws C.

[0009] Preferably, the method for preparing the fragile cap includes the following steps:

[0010] S1: The fragile lid is formed by foam molding.

[0011] S2: After molding, it is heated and cured, then cooled, demolded, and polished.

[0012] S3: After applying sealant evenly to the contact surfaces of the pressure frame and the bottom frame and allowing it to cure, assemble and tighten them using the sealing pressure plate and locking screws, and then conduct a test.

[0013] S4: After completing the test, use the fragile cover assembly separation device to separate the pressure frame from the bottom frame, and then sort and store them.

[0014] Preferably, the foaming process is chemical or physical foaming, and the fragile cap is made of epoxy foam or rigid polyurethane foam with a density of 0.15-0.8 g / cm³. 3 ;

[0015] In step S2, the molding mold is placed in a constant temperature oven for heating and curing at a temperature of 90-120 ℃ for 1-3 h. After curing, it is allowed to cool naturally to 40-60 ℃. The cover is then demolded, polished, and placed horizontally.

[0016] Preferably, the sealant in step S3 is a single-component silicone sealant, which is cured at an ambient temperature of not less than 25°C and a humidity of not less than 50%RH. The tests include high temperature test, low temperature test, damp heat test and air tightness test.

[0017] A fragile cap assembly separation device includes a screw A, an assembly block, and a pressure plate ring inner cavity. The assembly block is provided with a slot A and an installation groove. The screw A passes through the assembly block through the slot A. The pressure plate ring inner cavity is connected to the assembly block through the installation groove. The assembly block is connected to a pressure frame.

[0018] Preferably, the screw A is provided with a nut, washer A and washer B, the screw A is connected to the top of the assembly block through the washer, the washer A is disposed between the screw A and the washer B, the screw A passes through the assembly block through the slot A and is threadedly connected to the nut, and the screw A is a standard hexagonal head fastener.

[0019] Preferably, the assembly block is provided with a hole A, which communicates with the mounting groove, and a fixing groove is provided on one side of the mounting groove, and a screw B is provided in the fixing groove.

[0020] Preferably, the inner cavity of the pressure plate ring includes a base plate, a threaded sleeve, and a limiting member. The threaded sleeve and the limiting member are both disposed on the base plate. The limiting member is disposed on both sides of the threaded sleeve. The limiting member has a rectangular cross-section. The expansion strength of the inner cavity of the pressure plate ring is 0.5-3 MPa.

[0021] The beneficial effects of this invention are as follows:

[0022] In this invention, the fragile cap assembly is fixed and locked by an assembly stop block. The circumferential assembly stop block provides circumferential support and limitation, preventing the fragile cap assembly from tipping over or sliding. The bottom surface of the base plate of the inner cavity of the pressure plate ring and the axial limiter can achieve full constraint on the fragile cap assembly. The bottom surface of the base plate of the inner cavity of the pressure plate ring allows for high-precision docking between the assembly stop block and the fully sealed fragile cap assembly, ensuring safe separation of the fragile cap from the pressure plate. The fragile cap assembly separation device of this invention has the advantages of simple structure, manufacturability, low cost, high safety, simple and fast operation, and high efficiency, which helps to improve production and testing efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the fragile cap of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the fragile cap assembly separation device of the present invention;

[0026] In the diagram: 1-Screw A, 2-Nut, 3-Washer A, 4-Washer B, 5-Assembly block, 51-Slot A, 52-Mounting slot, 53-Hole A, 54-Fixing slot, 55-Screw B, 6-Inner cavity of pressure plate ring, 61-Base plate, 62-Screw sleeve, 63-Limiting component, 7-Pressure frame, 71-Screw hole A, 8-Base frame, 9-Fragile cap, 91-Groove, 92-Support part. Detailed Implementation

[0027] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0028] Example:

[0029] like Figures 1 to 3 As shown, a fragile cover assembly includes a pressure frame 7, a bottom frame 8, and a fragile cover 9. One end of the fragile cover 9 is connected to the pressure frame 7, and the other end of the fragile cover 9 is connected to the bottom frame 8. The fragile cover 9 has a groove 91 and a support portion 92, with the groove 91 connected to the support portion 92. The groove 91 ensures that the fragile cover 9 fractures directionally and with good flushness under the designed impact load, preventing damage to the projectile. The pressure frame 7, the bottom frame 8, and the fragile cover 9 are locked together with M8X60 screws, and the pressure frame 7 and the bottom frame 8 form a cover frame.

[0030] Both the pressure frame 7 and the bottom frame 8 are circular, and the fragile cover 9 is arched. The concave and convex surfaces of the fragile cover 9 are used to withstand the negative and positive pressure impacts of the gas flow, respectively. Several grooves 91 are symmetrically arranged around the center of the fragile cover 9, and the depth of the grooves 91 is 1-3 mm.

[0031] The pressure frame 7 is provided with a screw hole A71, and the screw A1 is threadedly connected to the screw hole A71 to fix the fragile cover assembly separation device on the pressure frame 7.

[0032] The method for preparing the fragile cap 9 includes the following steps:

[0033] S1: The fragile lid 9 is formed by foaming.

[0034] S2: After molding, it is heated and cured in a forced-air drying oven, then demolded after cooling and polished.

[0035] S3: After applying sealant evenly to the contact surfaces of the pressure frame 7 and the bottom frame 8 and allowing it to cure, assemble and tighten them using the sealing pressure plate and locking screws. Then, conduct a test according to the product technical requirements.

[0036] S4: After the test is completed, use the fragile cover assembly separation device to separate the pressure frame 7 from the bottom frame 8, and then sort and store them.

[0037] The foaming process is either chemical or physical foaming. The fragile cap 9 is made of epoxy foam or rigid polyurethane foam plastic with a density of 0.15-0.8 g / cm³. 3 ;

[0038] In step S2, the molding mold is placed in a constant temperature oven for heating and curing at a temperature of 90-120 ℃ for 1-3 h. After curing, it is allowed to cool naturally to 40-60 ℃. The cover is then demolded, polished, and placed horizontally.

[0039] In step S3, the sealant is a single-component silicone sealant, which is cured at an ambient temperature of not less than 25°C and a humidity of not less than 50%RH. The tests include high temperature test, low temperature test, damp heat test and air tightness test.

[0040] A fragile cap assembly separation device includes a screw A1, an assembly block 5, and a pressure plate ring inner cavity 6. The assembly block 5 is provided with a slot A51 and a mounting groove 52. The screw A1 passes through the assembly block 5 through the slot A51. The pressure plate ring inner cavity 6 is connected to the assembly block 5 through the mounting groove 52. The assembly block 5 is connected to a pressure frame 7.

[0041] The screw A1 is provided with a nut 2, a washer A3 and a washer B4. The screw A1 is connected to the top of the assembly block 5 through the washer. The washer A3 is placed between the screw A1 and the washer B4. The washer A3 has a certain elasticity and can reduce the vibration of the screw A1. The screw A1 passes through the assembly block 5 through the slot A51 and is threaded to the nut 2. The screw A1 is a standard hexagonal head fastener.

[0042] The assembly block 5 has a hole A53 that communicates with the mounting groove 52. A fixing groove 54 is provided on one side of the mounting groove 52, and a screw B55 is installed in the fixing groove 54. The screw B55 is threadedly connected to the threaded sleeve 62. By using a screw to pass through the hole A53 and contact the screw B55, the screw B55 is driven to rotate, thereby controlling the lifting and lowering of the inner cavity 6 of the pressure plate ring.

[0043] The inner cavity 6 of the pressure ring includes a base plate 61, a threaded sleeve 62, and a limiting member 63. Both the threaded sleeve 62 and the limiting member 63 are mounted on the base plate 61. The limiting member 63 is located on both sides of the threaded sleeve 62 and has a rectangular cross-section. The opening strength of the inner cavity 6 of the pressure ring is 0.5-3 MPa, capable of opening the fragile cover 9 from the cover frame by a height of 1-10 mm. The limiting member 63 can slide in the mounting groove 52 to limit the rising height of the inner cavity 6 of the pressure ring. The base plate 61 can contact and connect with the fragile cover 9. As the inner cavity 6 of the pressure ring descends, the fragile cover 9 is ejected and separated from the fragile cover assembly.

[0044] The bottom surface of the base plate of the inner cavity 6 of the pressure plate ring and the axial limit can achieve full constraint on the sealed fragile cover assembly. The feature is that by rotating the screw B55 clockwise with an Allen wrench, it is connected to the threaded sleeve 62. Rotating the Allen wrench through the screw B55 gives the inner cavity 6 of the pressure plate ring a pre-tightening force. At this time, the bottom surface of the base plate 61 is completely and closely attached to the surface of the sealed fragile cover assembly. As the pre-tightening force increases, the base plate 61 extends downward and pushes out the fragile cover 9 to separate it.

Claims

1. A fragile cap assembly, characterized in that: It includes a pressure frame (7), a bottom frame (8), and a fragile cover (9). One end of the fragile cover (9) is connected to the pressure frame (7), and the other end of the fragile cover (9) is connected to the bottom frame (8). The fragile cover (9) is provided with a groove (91) and a support part (92), and the groove (91) is connected to the support part (92). The fragile cap assembly separation device includes a screw A (1), an assembly block (5), and a pressure plate ring inner cavity (6). The assembly block (5) is provided with a slot A (51) and a mounting groove (52). The screw A (1) passes through the assembly block (5) through the slot A (51). The pressure plate ring inner cavity (6) is connected to the assembly block (5) through the mounting groove (52). The assembly block (5) is connected to the pressure frame (7). The pressure frame (7) and the bottom frame (8) are both circular, the fragile cover (9) is arched, and the groove (91) is symmetrically arranged around the center of the fragile cover (9). The pressure frame (7) is provided with screw holes A (71), screw holes B and screws C; The screw A (1) is provided with a nut (2), washer A (3) and washer B (4). The screw A (1) is connected to the top of the assembly block (5) through the washer. The washer A (3) is provided between the screw A (1) and the washer B (4). The screw A (1) passes through the assembly block (5) through the slot A (51) and is threaded to the nut (2). The screw A (1) is a standard hexagonal cylindrical head fastener. The assembly block (5) is provided with a hole A (53), which is connected to the mounting groove (52). A fixing groove (54) is provided on one side of the mounting groove (52), and a screw B (55) is provided in the fixing groove (54). The inner cavity (6) of the pressure plate ring includes a base plate (61), a threaded sleeve (62) and a limiting member (63). The threaded sleeve (62) and the limiting member (63) are both disposed on the base plate (61). The limiting member (63) is disposed on both sides of the threaded sleeve (62). The limiting member (63) has a rectangular cross-section. The expansion strength of the inner cavity (6) of the pressure plate ring is 0.5-3MPa.

2. The fragile cover assembly as described in claim 1, characterized in that, The method for preparing the fragile cap (9) includes the following steps: S1: The fragile lid (9) is formed by foaming; S2: After molding, it is heated and cured, then demolded and polished after cooling; S3: Apply sealant evenly to the contact surfaces of the pressure frame (7) and the bottom frame (8) and cure it. Then assemble and lock it with the sealing pressure plate and locking screws, and then conduct a test. S4: After the test is completed, use the fragile cover assembly separation device to separate the pressure frame (7) from the bottom frame (8), and then sort and store them.

3. A fragile cover assembly as described in claim 2, characterized in that: The foaming process is either chemical or physical foaming. The fragile cap (9) is made of epoxy foam or rigid polyurethane foam with a density of 0.15-0.8 g / cm³. 3 ; In step S2, the molding mold is placed in a constant temperature oven for heating and curing at a temperature of 90-120℃ for 1-3 hours. After curing, the mold is allowed to cool naturally to 40-60℃. The cover is then demolded, polished, and placed horizontally.

4. A fragile cover assembly as described in claim 2, characterized in that: In step S3, the sealant is a single-component silicone sealant, which is cured at an ambient temperature of not less than 25°C and a humidity of not less than 50%RH. The tests include high temperature test, low temperature test, damp heat test and air tightness test.

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