Pressurization device and system for large-curvature composite sandwich components

Abstract

The application provides a pressurizing device and system for a large-curvature composite sandwich component, and relates to the technical field of composite manufacturing. The device comprises a pressure air bag, a compressed air connecting pipe, a compressed air pressurizer and a fixing assembly. The pressure air bag is arranged at the bottom of the large-curvature composite sandwich component and closely adheres to the bottom of the large-curvature composite sandwich component. One end of the compressed air connecting pipe is connected with the air inlet of the pressure air bag, and the other end is connected with the air outlet of the compressed air pressurizer. The fixing assembly is used for fixing the pressure air bag at the bottom of the large-curvature composite sandwich component. The compressed air of the compressed air pressurizer is introduced into the pressure air bag through the compressed air connecting pipe to pressurize the pressure air bag, so that the pressure air bag is inflated to uniformly apply pressure to the bottom of the large-curvature composite sandwich component. According to the scheme of the application, the bottom cavity or delamination caused by the underpressure of the bottom of the large-curvature composite sandwich component can be eliminated, so that the failure rate and the scrap rate are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite material manufacturing, and in particular to a pressurizing device and system for large-curvature composite sandwich parts. BACKGROUND

[0002] There is a common large-curvature composite sandwich part in the materials used in the fields of aerospace, automobile industry and rail transit. The cross section of this kind of part is U-shaped or V-shaped, so the curvature is large, and in the forming process, the bottom of the U-shaped or V-shaped part is prone to under-pressurization, which leads to bottom cavity or delamination and further leads to part failure or scrap. Therefore, how to eliminate the under-pressurization of the bottom of the U-shaped or V-shaped part to reduce the failure rate and scrap rate of the large-curvature composite sandwich part is a technical problem to be solved. SUMMARY

[0003] The present application provides a pressurizing device and system for large-curvature composite sandwich parts, which can eliminate the bottom cavity or delamination caused by the under-pressurization of the bottom of the large-curvature composite sandwich part by pressurizing the under-pressurized area of the bottom of the large-curvature composite sandwich part, thereby reducing the failure rate and scrap rate of the large-curvature composite sandwich part.

[0004] According to a first aspect of the embodiments of the present application, a pressurizing device for large-curvature composite sandwich parts is provided, comprising: a pressure air bag, a compressed air connecting pipe, a compressed air pressurizer and a fixing assembly;

[0005] The pressure air bag is placed at the bottom of the large-curvature composite sandwich part and tightly adheres to the bottom of the large-curvature composite sandwich part; one end of the compressed air connecting pipe is connected to the air inlet of the pressure air bag, and the other end is connected to the air outlet of the compressed air pressurizer; and the fixing assembly is used to fix the pressure air bag at the bottom of the large-curvature composite sandwich part.

[0006] The compressed air of the compressed air pressurizer is introduced into the pressure air bag through the compressed air connecting pipe to pressurize the pressure air bag, so that the pressure air bag expands and uniformly applies pressure to the bottom of the large-curvature composite sandwich part.

[0007] In an embodiment, a sealing ring and a sealing bolt matched with the sealing ring are respectively arranged at the connection between the compressed air connecting pipe and the air inlet of the pressure air bag and the connection between the compressed air connecting pipe and the air outlet of the compressed air pressurizer; the sealing ring and the sealing bolt are used to seal and connect the pressure air bag and the compressed air connecting pipe, and the compressed air pressurizer and the compressed air connecting pipe.

[0008] In an embodiment, the pressure air bag is introduced into compressed air, and the internal diameter of the expanded pressure air bag ranges from 4mm to 8mm.

[0009] In an embodiment, the fixing assembly comprises: a fixing buckle for fixing the pressure air bag to the bottom of the large-curvature composite sandwich component; one side of the fixing buckle is connected with a fixing rod, and the other side is attached to the pressure air bag; the fixing rod is used for connecting the fixing buckle and a fixing cover plate; one end of the fixing rod is connected with the fixing buckle, and the other end penetrates through the fixing cover plate; the fixing cover plate is used for fixing the fixing buckle and the fixing rod; a hole through which the fixing rod penetrates is arranged at the center of the fixing cover plate; and bolts are arranged on both sides of the fixing cover plate to tightly connect the fixing cover plate with the large-curvature composite sandwich component.

[0010] In an embodiment, the fixing buckle is an arc-shaped component attached to the pressure air bag; and the range of the arc of the fixing buckle is 120°-170°.

[0011] In an embodiment, the large-curvature composite sandwich component with the pressurizing device further comprises: at least two groups of guide assemblies arranged on both sides of the fixing assembly; and the guide assemblies are used for moving the pressure air bag to a target position on the bottom of the large-curvature composite sandwich component.

[0012] In an embodiment, the guide assembly comprises: a linear guide rail, a sliding block, and a motor; the linear guide rail is parallel to the reference surface of the large-curvature composite sandwich component; the sliding block is connected with the fixing buckle and is driven by the motor to move the pressure air bag along the linear guide rail to the target position on the bottom of the large-curvature composite sandwich component.

[0013] In an embodiment, the compressed air presser is provided with a pressure display for displaying the pressure value generated by the compressed air supplied by the compressed air presser to the pressure air bag.

[0014] According to a second aspect of the embodiments of the present application, a pressurizing system for a large-curvature composite sandwich component is provided, comprising:

[0015] The pressurizing device for a large-curvature composite sandwich component as described in the first aspect is used for uniformly applying pressure to the bottom of the large-curvature composite sandwich component to eliminate the cavity or delamination on the bottom caused by the under-pressure of the bottom of the large-curvature composite sandwich component;

[0016] A pressure sensor is used for monitoring the air pressure value in the pressure air bag in real time and transmitting the air pressure value to the computing unit and the controller; the pressure sensor is arranged in the pressure air bag of the pressurizing device for a large-curvature composite sandwich component;

[0017] The computing unit is used for calculating the opening adjustment amount of the electromagnetic control valve of the compressed air presser according to the air pressure value and transmitting the opening adjustment amount to the controller;

[0018] The controller is used for adjusting the opening of the electromagnetic control valve of the compressed air presser according to the opening adjustment amount.

[0019] In one embodiment, the controller is further configured to adjust the opening of the electromagnetic control valve of the compressed air pressurizer to supplement the pressure when the monitored air pressure value decreases.

[0020] According to the scheme of the present application, the bottom cavity or delamination caused by the under-pressure of the large-curvature composite sandwich component can be eliminated by pressurizing the under-pressure area of the bottom of the large-curvature composite sandwich component, thereby reducing the failure rate and scrap rate of the large-curvature composite sandwich component.

[0021] It should be understood that the content described in the summary section is not intended to limit the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0022] The above and other features, advantages and aspects of embodiments of the present application will become more apparent upon reading the following detailed description in conjunction with the accompanying drawings, in which like references refer to like elements. In the drawings:

[0023] Figure 1 is a structural schematic diagram of a pressurizing device for a large-curvature composite sandwich component according to an embodiment of the present application;

[0024] Figure 2 is a sectional schematic diagram of a pressure air bag, a compressed air connection pipe, and a compressed air pressurizer according to an embodiment of the present application;

[0025] Figure 3 is a structural schematic diagram of a guide assembly according to an embodiment of the present application;

[0026] Figure 4 is a structural schematic diagram of a pressurizing system for a large-curvature composite sandwich component according to an embodiment of the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1: pressure air bag;

[0029] 2: compressed air connection pipe;

[0030] 3: compressed air pressurizer;

[0031] 4: fixing buckle;

[0032] 5: fixing rod;

[0033] 6: fixing cover plate;

[0034] 7: honeycomb sandwich;

[0035] 8: prepreg;

[0036] 9: forming tool;

[0037] 10: seal ring;

[0038] 11: seal bolt;

[0039] 12: linear guide rail;

[0040] 13: slider;

[0041] 14: motor. DETAILED DESCRIPTION

[0042] Exemplary embodiments of the present application are described herein with reference to the accompanying drawings, which are meant to be exemplary in nature, and include various details intended to facilitate understanding of the application. Thus, it should be apparent to those skilled in the art that various modifications and changes can be made in the embodiments described without departing from the scope and spirit of the application. Likewise, the description is not to be understood as implying that the application is limited to the particular forms described, but that the application is to be given the broadest possible interpretation in accordance with the appended claims.

[0043] In the related art, there is a common forming tooling (i.e., large-curvature composite sandwich component) in the materials used in the fields of aerospace, automobile industry, and rail transit. The cross section of this type of component is U-shaped or V-shaped, so the curvature is large, and in the forming process, the bottom of the U-shaped or V-shaped part is prone to under-pressing, thereby causing problems such as bottom cavity or delamination, and further causing part failure or scrap. Taking a U-shaped composite honeycomb sandwich component as an example, one of the biggest difficulties in manufacturing this type of component is the pressing problem of the honeycomb sandwich. In particular, the process difficulty increases during the honeycomb sandwich laying process, which is manifested in that the honeycomb sandwich at the bottom (i.e., the large-curvature area) is difficult to be compacted in place during the laying process, and air gaps are easily formed between the honeycomb sandwich and the prepreg, and since the bottom is under-pressed, it is more likely to cause problems such as bottom cavity or delamination after the part is cured. The above defects can lead to a high failure rate and scrap rate of the component.

[0044] In the prior art, the pressing method for U-shaped composite sandwich parts is mainly single vacuum extraction and compaction. In actual production, the vacuum extraction and compaction operation has a large process instability due to the difference in curvature of the parts themselves or the difference in operation methods. This results in the cured parts often having porosity or delamination, and the failure rate and scrap rate of the parts are still high.

[0045] To solve the above technical problems, the application provides a pressurizing device and system for a large-curvature composite sandwich component.

[0046] One embodiment of the application provides a pressurizing device for a large-curvature composite sandwich component, as shown in the figure. Figure 1 The device comprises a pressure air bag 1, a compressed air connecting pipe 2, a compressed air pressurizer 3, and a fixing assembly. The pressure air bag 1 is placed on the bottom of the large-curvature composite sandwich component and tightly adheres to the bottom of the large-curvature composite sandwich component. One end of the compressed air connecting pipe 2 is connected to the air inlet of the pressure air bag 1, and the other end is connected to the air outlet of the compressed air pressurizer 3. The fixing assembly is used to fix the pressure air bag 1 on the bottom of the large-curvature composite sandwich component. The compressed air of the compressed air pressurizer 3 is introduced into the pressure air bag 1 through the compressed air connecting pipe 2 to pressurize the pressure air bag 1, so that the pressure air bag 1 expands and uniformly applies pressure to the bottom of the large-curvature composite sandwich component.

[0047] According to one embodiment of the application, it should be noted that:

[0048] In Figure 1For example, molding fixture 9 (i.e., a high-curvature composite sandwich component) refers to a sandwich structure component made of composite materials with a large curvature (i.e., a large degree of surface bending). High curvature refers to a large degree of bending, such as a "U-shape" or "V-shape". The sandwich structure of a high-curvature composite sandwich component is a structural form in which two relatively thin parallel panels (often called skins) are bonded to a relatively thick, lightweight core material and separated by it. For example, a U-shaped composite honeycomb sandwich component refers to a component with a "U-shaped" cross-sectional shape and made of composite honeycomb sandwich structure. The U-shaped composite honeycomb sandwich component mainly consists of a honeycomb sandwich layer 7 and a prepreg 8; wherein, the honeycomb sandwich layer 7 is located between the two panels and is composed of several hexagonal or other shaped honeycomb units; the prepreg 8 is a composite material composed of fibers and resin, used to make the panels and bonded to the honeycomb sandwich layer 7 by an adhesive.

[0049] by Figure 1 , Figure 3 For example, the pressure airbag 1 is a bag or device made of an expandable material and filled with gas. Preferably, the pressure airbag 1 is made of rubber, which gives it good pressure resistance and elasticity. To meet the requirements during the curing process, the pressure airbag 1 is made of a special material that can withstand temperatures above 230°C. The difference between the coefficient of thermal expansion of the pressure airbag 1 and the coefficient of thermal expansion of the composite prepreg 8 does not exceed 1×10⁻⁵ / °C. Compressed air is introduced into the pressure airbag 1, and the internal diameter of the expanded pressure airbag 1 ranges from 4-8 mm, the outer diameter is designed to be 3-15 mm, and the thickness ranges from 1-2 mm. The airbag is made of rubber or other materials with excellent elasticity, pressure resistance, and fatigue resistance to ensure that its performance remains stable during repeated inflation and deflation, without problems such as rupture, deformation, or elasticity loss. A high-precision pressure sensor is installed inside the airbag to monitor the air pressure value inside the airbag in real time and transmit the data to the controller of the pressurization system for large-curvature composite sandwich components. A sealing ring 10 and a sealing bolt 11 that mates with the sealing ring 10 are respectively provided at the connection points between the compressed air connecting pipe 2 and the air inlet of the pressure bag 1 and the air outlet of the compressed air booster 3; the sealing ring 10 and the sealing bolt 11 are used to seal the connection between the pressure bag 1 and the compressed air connecting pipe 2.

[0050] by Figure 1For example, one end of the compressed air connecting pipe 2 is connected to the pressure bladder 1, and the other end is connected to the compressed air compressor 3. The compressed air connecting pipe 2 can be made of organic materials (such as rubber, plastic, etc.) or metal materials (such as copper, aluminum, stainless steel, etc.). The compressed air connecting pipe 2 is used to transfer compressed air from the compressed air compressor 3 to the pressure bladder 1. Here, the size of the compressed air connecting pipe 2 is not specifically limited; its size can be set according to the distance between the pressure bladder 1 and the compressed air compressor 3.

[0051] by Figure 1 For example, the compressed air booster 3 is used to compress air, output compressed air, and transmit the compressed air to the pressure bladder bag 1 through the compressed air connecting pipe 2. The compressed air booster 3 is equipped with a pressure display, which is used to monitor the pressure value generated by the incoming compressed air. The working principle of the compressed air booster 3 can include:

[0052] 1. Piston type: Gas is compressed by the reciprocating motion of the piston in the cylinder; when the piston moves to one end of the cylinder, the gas in the cylinder is compressed and the pressure increases; when the piston moves to the other end, the gas in the cylinder is discharged, and new gas is drawn into the cylinder.

[0053] 2. Turbine type: It uses the high-speed rotation of a turbine to compress gas; when gas passes through the turbine, the turbine blades convert the kinetic energy of the gas into pressure energy, thereby achieving gas compression.

[0054] 3. Screw type: Gas is compressed by the rotation of two meshing screws inside the housing; as the screws rotate, the space between them gradually decreases, thereby compressing the gas.

[0055] The fixing components include: a fixing buckle 4 for fixing the pressure airbag 1 to the bottom of the high-curvature composite sandwich component; Figure 1 For example, one side of the fixing buckle 4 is connected to the fixing rod 5, and the other side is attached to the pressure airbag 1; the fixing rod 5 is used to connect the fixing buckle 4 and the fixing cover plate 6; one end of the fixing rod 5 is connected to the fixing buckle 4, and the other end passes through the fixing cover plate 6; the fixing cover plate 6 is used to fix the fixing buckle 4 and the fixing rod 5; a hole is provided in the center of the fixing cover plate 6 so that the fixing rod 5 can pass through; bolts are provided on both sides of the fixing cover plate 6 to tightly connect the fixing cover plate 6 to the large curvature composite sandwich component.

[0056] The bottom of the large-curvature composite sandwich component refers to the lower end or lower surface area of the composite sandwich structure component with a large bending degree in the vertical direction. The cross section of the large-curvature composite sandwich component is in the shape of "U" or "V", so the curvature of the bottom of the large-curvature composite sandwich component is large; in the forming process, the "U" or "V" bottom is prone to under-pressing, thereby causing the bottom cavity or delamination and further causing the failure or scrap of the part.

[0057] The use matters of the pressurizing device for the large-curvature composite sandwich component can include:

[0058] (1) The pressure air bag 1 is placed at the target position of the bottom of the large-curvature composite sandwich component through the guide assembly and the fixing assembly, and the pressure air bag 1 is fixed at the target position of the bottom of the large-curvature composite sandwich component through the fixing buckle 4. It should be noted that the fixing buckle 4 does not contact the large-curvature composite sandwich component;

[0059] (2) The fixing cover plate 6 and the large-curvature composite sandwich component are fixed and installed together through the bolt, and the pressure air bag 1 is further locked to prevent the pressure air bag 1 from bouncing up during the pressurization to the large-curvature composite sandwich component;

[0060] (3) The compressed air is introduced into the pressure air bag 1 from the compressed air pressurizer 3 through the compressed air connecting pipe 2; it should be noted that the pressure applied to the pressure air bag 1 does not exceed 300 kPa.

[0061] According to one embodiment of the present application, the under-pressing area of the bottom of the large-curvature composite sandwich component is pressurized by the pressurizing device for the large-curvature composite sandwich component composed of the pressure air bag, the compressed air connecting pipe, the compressed air pressurizer and the fixing assembly, which can eliminate the bottom cavity or delamination caused by the under-pressing of the bottom of the large-curvature composite sandwich component, thereby reducing the failure rate and scrap rate of the large-curvature composite sandwich component.

[0062] In one embodiment, the compressed air connecting pipe 2 is provided with a sealing ring 10 and a sealing bolt 11 matched with the sealing ring 10 at the connection between the air inlet of the pressure air bag 1 and the air outlet of the compressed air pressurizer 3; the sealing ring 10 and the sealing bolt 11 are used to seal the connection between the pressure air bag 1 and the compressed air connecting pipe 2, and the connection between the compressed air pressurizer 3 and the compressed air connecting pipe 2.

[0063] According to the embodiment of the present application, it should be noted that:

[0064] The pressure air bag 1 is placed at the target position of the bottom of the large-curvature composite sandwich component through the guide assembly and the fixing assembly, and the pressure air bag 1 is fixed at the target position of the bottom of the large-curvature composite sandwich component through the fixing buckle 4. It should be noted that the fixing buckle 4 does not contact the large-curvature composite sandwich component; Figure 3For example, the sealing ring 10 is a ring-shaped component. The sealing ring 10 and the sealing bolt 11 cooperate to seal the connection between the pressure bladder 1 and the compressed air connecting pipe 2, and between the compressed air pressurizer 3 and the compressed air connecting pipe 2, to prevent compressed air leakage at the connection. The sealing ring 10 is usually made of an elastic material or a metal material with a certain degree of elasticity to ensure that it can generate sufficient deformation when subjected to the tightening force of the sealing bolt 11, thereby tightly fitting the surface of the connection.

[0065] by Figure 3 For example, the sealing bolt 11 is a special type of bolt. Compared to ordinary bolts, sealing bolts 11 typically have a larger thread diameter and a longer thread length to provide sufficient tightening force and sealing effect. Furthermore, the head and threaded portion of the sealing bolt 11 may undergo special treatment to enhance its sealing performance and corrosion resistance.

[0066] According to one embodiment of the present invention, a sealing ring and a sealing bolt that cooperate with the sealing ring are respectively provided at the connection between the compressed air connecting pipe and the air inlet of the pressure bag and the air outlet of the compressed air compressor, so as to seal the connection between the pressure bag and the compressed air connecting pipe and the compressed air compressor and the compressed air connecting pipe to prevent compressed air from leaking at the connection.

[0067] In one embodiment, the pressure airbag 1 is supplied with compressed air, and the internal diameter of the pressure airbag 1 during expansion ranges from 4 to 8 mm.

[0068] According to one embodiment of the present invention, it should be noted that:

[0069] In practical applications, if the inflatable diameter of the pressure bladder 1 is too large, the additional pressure will be applied to the area above the bottom, resulting in an insignificant pressure difference between the bottom and the area above the bottom, and poor bottom compaction. To ensure that the pressure is fully applied to the under-pressure area at the bottom of the large-curvature composite sandwich component, the following measures are taken: Figure 1 , Figure 3 For example, compressed air is introduced into the pressure airbag 1, and the internal diameter of the pressure airbag 1 when it expands ranges from 4 to 8 mm.

[0070] According to one embodiment of the present invention, by setting the internal diameter range of the inflatable pressure airbag to 4-8 mm, the pressure can be fully applied to the under-pressure area at the bottom of the large-curvature composite sandwich component, thereby improving the pressurization effect on the large-curvature composite sandwich component.

[0071] In one embodiment, the fixing assembly includes: a fixing buckle 4 for fixing the pressure airbag 1 to the bottom of the high-curvature composite sandwich component; one side of the fixing buckle 4 is connected to the fixing rod 5, and the other side is in contact with the pressure airbag 1; the fixing rod 5 is used to connect the fixing buckle 4 and the fixing cover plate 6; one end of the fixing rod 5 is connected to the fixing buckle 4, and the other end passes through the fixing cover plate 6; the fixing cover plate 6 is used to fix the fixing buckle 4 and the fixing rod 5; a hole is provided in the center of the fixing cover plate 6 for the fixing rod 5 to pass through; bolts are provided on both sides of the fixing cover plate 6 to tightly connect the fixing cover plate 6 to the high-curvature composite sandwich component.

[0072] According to one embodiment of the present invention, it should be noted that:

[0073] The fixing buckle 4 is used to fix the pressure airbag 1 to the bottom of the high-curvature composite sandwich component; Figure 1 For example, one side of the fixing buckle 4 is connected to the fixing rod 5, and the other side is attached to the pressure airbag 1. The fixing buckle 4 is made of steel. The fixing buckle 4 adopts a multi-point design, which can be flexibly adjusted according to the different shapes and sizes of the sandwich structure components, ensuring that the pressure airbag 1 can be tightly attached to the bottom of the sandwich component and remain in a fixed position during the pressurization process. Here, the size of the fixing buckle 4 is not specifically limited; its size can be set according to the size of the pressure airbag 1.

[0074] The fixing rod 5 is used to connect the fixing buckle 4 and the fixing cover plate 6; Figure 1 For example, one end of the fixing rod 5 is connected to the fixing buckle 4, and the other end passes through the fixing cover plate 6. The fixing rod 5 needs to have a certain rigidity and strength, and the fixing rod 5 is made of the same material as the fixing buckle 4; the fixing rod 5 connects the fixing buckle 4 and the fixing cover plate 6 together by welding. Preferably, the diameter of the fixing rod 5 is 5mm. The length of the fixing rod 5 is greater than the height of the forming fixture 9 (i.e., the high curvature composite sandwich component). Exemplarily, the fixing assembly includes: a fixing buckle 4, one fixing rod 5, and a fixing cover plate 6, with one end of the fixing rod 5 connected to the fixing buckle 4 and the other end passing through the fixing cover plate 6. Again, exemplarily, the fixing assembly includes: a fixing buckle 4, N fixing rods 5, and a fixing cover plate 6, with one end of each of the N fixing rods 5 connected to the fixing buckle 4 and the other end passing through the fixing cover plate 6. The spacing between the fixing rods 5 ranges from 100-500mm, and N is not less than 2. Preferably, the fixing rod 5 is made of high-strength aluminum alloy, which has the characteristics of high rigidity and lightweight. Here, the length of the fixing rod 5 is not specifically limited; its length can be set according to the height of the forming fixture 9.

[0075] The fixed cover plate 6 is used to fix the fixing buckle 4 and the fixing rod 5; Figure 1For example, the fixed cover plate 6 is provided with a hole through which the fixed rod 5 passes in the center; the fixed cover plate 6 is provided with a bolt on both sides, respectively, to tightly connect the fixed cover plate 6 and the large-curvature composite sandwich component, so that the pressure generated by the pressure air bag 1 can better act on the bottom of the large-curvature composite sandwich component and not be bounced up. The fixed cover plate 6 is made of the same steel material as the fixed buckle 4 and the fixed rod 5. Preferably, the fixed cover plate 6 is made of high-strength aluminum alloy material, which has the characteristics of high rigidity and light weight. Here, the shape and size of the fixed cover plate 6 are not specifically limited, and can be set according to the shape and size of the forming tool 9.

[0076] According to an embodiment disclosed by the present application, the fixed assembly composed of the fixed buckle, the fixed rod and the fixed cover plate can provide a stable support platform for the pressure air bag, which helps to improve the stability of the pressurization of the large-curvature composite sandwich component.

[0077] In one embodiment, the fixed buckle 4 is an arc-shaped component that fits the shape of the pressure air bag 1; the range of the arc of the fixed buckle 4 is 120°-170°.

[0078] According to an embodiment disclosed by the present application, it should be noted that:

[0079] The fixed buckle 4 needs to have a certain rigidity and strength, and the difference between its expansion coefficient and the thermal expansion coefficient of the pressure air bag 1 is not more than 1×10-5 / ℃. Preferably, the fixed buckle 4 can be made of steel material; the arc of the fixed buckle 4 is 120°-170°; the thickness of the fixed buckle 4 is 2-5mm; so as to ensure that the fixed buckle 4 only contacts the pressure air bag 1, and does not contact the large-curvature composite sandwich component, so as to avoid damage to the large-curvature composite sandwich component caused by the two ends of the fixed buckle 4.

[0080] According to an embodiment disclosed by the present application, by setting the fixed buckle to be arc-shaped, the shape of the pressure air bag can be better fitted, and the effect of the fixed assembly in fixing the pressure air bag can be improved.

[0081] In one embodiment, the large-curvature composite sandwich component pressurization device further comprises: at least two groups of guide assemblies, the guide assemblies being respectively arranged on both sides of the fixed assembly; the guide assemblies are used to move the pressure air bag 1 to the target position at the bottom of the large-curvature composite sandwich component.

[0082] According to an embodiment disclosed by the present application, it should be noted that:

[0083] For example, the fixed buckle 4 is an arc-shaped component that fits the shape of the pressure air bag 1; the range of the arc of the fixed buckle 4 is 120°-170°. Figure 3For example, the guide assembly includes: a high-precision linear guide 12, a slider 13, and a motor 14; the linear guide 12 is parallel to the reference plane of the large curvature composite sandwich component; the slider 13 is connected to the fixing buckle 4, and is driven by the motor 14 to move the pressure airbag 1 along the linear guide 12 to the target position at the bottom of the large curvature composite sandwich component.

[0084] According to one embodiment of the present invention, a guiding assembly consisting of a high-precision linear guide, a slider, and a motor can be used to move a pressure airbag to a target position at the bottom of a large-curvature composite sandwich component, thereby improving the accuracy of pressurizing the under-pressure area at the bottom of the large-curvature composite sandwich component.

[0085] In one embodiment, the guide assembly includes: a linear guide rail 12, a slider 13, and a motor 14; the linear guide rail 12 is parallel to the reference plane of the high-curvature composite sandwich component; the slider 13 is connected to the retaining buckle 4 and is driven by the motor 14 to move the pressure airbag 1 along the linear guide rail 12 to the target position at the bottom of the high-curvature composite sandwich component.

[0086] According to one embodiment of the present invention, it should be noted that:

[0087] by Figure 3 For example, the linear slider 12 is a linear transmission mechanism used to support and guide moving parts to perform reciprocating linear motion in a given direction. The linear slider 12 has high guiding performance, a compact structure, and due to the high precision of the lead screw and nut fit, it can achieve high positioning accuracy and high-speed motion performance.

[0088] by Figure 3 For example, slider 13 is a sliding element that cooperates with linear guide rail 12 to support and guide the movement of the fixing components and the pressure airbag 1 on linear guide rail 12. The material of slider 13 itself has appropriate hardness and wear resistance, which is sufficient to withstand the friction of moving on linear guide rail 12.

[0089] by Figure 3 For example, motor 14 provides the power source for the movement of slider 13 in linear guide rail 12, driving slider 13 to perform reciprocating linear motion on linear guide rail 12. Motor 14 can be a DC motor, AC motor, stepper motor, etc. Here, the type of motor 14 is not limited, and its type can be selected according to the requirements.

[0090] The target location refers to the position where undervoltage occurs at the bottom of a high-curvature composite sandwich component.

[0091] According to one embodiment disclosed by the present application, the pressure air bag can be moved to the under-pressure position at the bottom of the large-curvature composite sandwich component by the guide assembly, which helps to improve the accuracy of pressurizing the large-curvature composite sandwich component.

[0092] In one embodiment, the compressed air presser 3 is provided with a pressure display for displaying the pressure value generated by the compressed air introduced into the pressure air bag 1 by the compressed air presser 3.

[0093] According to one embodiment disclosed by the present application, it should be noted that:

[0094] The pressure display is a device for displaying the pressure value; the pressure display is a digital or analog instrument that can display the pressure value generated by the compressed air introduced into the pressure air bag 1 by the compressed air presser 3 in real time. The pressure display usually uses a Light Emitting Diode (LED) digital tube or a liquid crystal display screen, which can clearly display the current air pressure value.

[0095] According to one embodiment disclosed by the present application, the pressure display can display the pressure value generated by the compressed air introduced into the pressure air bag by the compressed air presser in real time and intuitively, which helps to improve the accuracy of the pressurizing device for large-curvature composite sandwich components.

[0096] One embodiment disclosed by the present application provides a pressurizing system for large-curvature composite sandwich components, as shown in Figure 4 The system comprises:

[0097] The pressurizing device for large-curvature composite sandwich components is used to apply uniform pressure to the bottom of the large-curvature composite sandwich component to eliminate the bottom cavity or delamination caused by the under-pressure at the bottom of the large-curvature composite sandwich component;

[0098] The pressure sensor is used to monitor the air pressure value in the pressure air bag 1 in real time and transmit the air pressure value to the computing unit and the controller; the pressure sensor is arranged in the pressure air bag 1 of the pressurizing device for large-curvature composite sandwich components;

[0099] The computing unit is used to calculate the opening adjustment amount of the electromagnetic control valve of the compressed air presser 3 according to the air pressure value and transmit the opening adjustment amount to the controller;

[0100] The controller is used to adjust the opening of the electromagnetic control valve of the compressed air presser 3 according to the opening adjustment amount.

[0101] The pressurizing device for large-curvature composite sandwich components is the pressurizing device for large-curvature composite sandwich components as described above.

[0102] In one embodiment, the pressure sensor is used to monitor the air pressure value in the pressure bag 1 in real time, and transmit the air pressure value to the computing unit and the controller; the distance sensor can be a resonance sensor, an electromagnetic sensor or a piezoelectric sensor, etc. Here, the type of pressure sensor is not specifically limited, and its type can be set according to the needs.

[0103] In one embodiment, the large-curvature composite sandwich component pressurization system is started, and the motor 14 drives the sliding block 13 to move the fixing device and the pressure bag 1 to the target position according to the instruction of the preset target position. The electromagnetic control valve of the compressed air pressurizer 3 starts to slowly open according to the control signal of the controller, and the compressed air gradually fills the pressure bag 1. The pressure sensor monitors the air pressure value in the bag in real time, and transmits the air pressure value to the computing unit and the controller. The controller calculates the opening adjustment amount of the electromagnetic control valve according to the received pressure value, and the computing unit calculates based on the pressure value, so as to realize accurate control of pressurization. When the pressure reaches the preset target pressure value, the electromagnetic control valve maintains the current opening degree, so that the pressure is stabilized in the preset range. During the pressurization process, the pressure bag 1 deforms adaptively with the change of the curvature of the bottom of the large-curvature composite sandwich component, and the pressure is uniformly applied to the bottom of the large-curvature composite sandwich component through the fixing effect of the fixing device, effectively eliminating the bottom cavity or delamination caused by the under-pressurization of the bottom of the large-curvature composite sandwich component.

[0104] According to one embodiment of the present application, by pressurizing the under-pressurized area of the bottom of the large-curvature composite sandwich component, the bottom cavity or delamination caused by the under-pressurization of the bottom of the large-curvature composite sandwich component can be eliminated, thereby reducing the failure rate and scrap rate of the large-curvature composite sandwich component. At the same time, by calculating the opening adjustment amount of the electromagnetic control valve of the compressed air pressurizer according to the air pressure value provided by the pressure sensor, the accuracy of pressurizing the under-pressurized area of the bottom of the large-curvature composite sandwich component can be improved.

[0105] In one embodiment, the controller is also used to adjust the opening of the electromagnetic control valve of the compressed air pressurizer 3 for pressure compensation when the air pressure value is monitored to decrease.

[0106] In one embodiment, the pressure maintaining operation is performed according to a preset pressure maintaining time. During the pressure maintaining, the large-curvature composite sandwich component is continuously monitored by the pressurizing system for pressure value. If a downward trend of the pressure value is found, the electromagnetic control valve opening of the compressed air pressurizer 3 is adjusted to supplement the pressure, so as to ensure the stability of the pressure during the whole pressure maintaining process. Meanwhile, during the pressure maintaining process, the pressure air bag 1 can be driven by the motor 14 to move back and forth or vibrate in a certain range according to the process requirements, so as to further promote the compaction and lamination effect of the material and improve the part quality. When the pressure maintaining time ends, the electromagnetic control valve of the compressed air pressurizer 3 is slowly closed to release the compressed air in the pressure air bag 1. The motor 14 drives the pressure air bag 1 to move to the initial position, so as to take out the processed large-curvature composite sandwich component.

[0107] According to one embodiment disclosed by the present application, the opening of the electromagnetic control valve can be accurately adjusted according to the change of the air pressure value, which helps to avoid the damage to the large-curvature composite sandwich component caused by excessively high or low air pressure, and improves the stability and reliability of the pressurizing system for the large-curvature composite sandwich component.

[0108] In the description of the present application, it should be understood that, unless otherwise explicitly specified and limited, the orientation or positional relationship indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0109] In addition, the terms “first” and “second” are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of “multiple” is two or more, unless otherwise explicitly specified and limited.

[0110] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a communication 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 according to the specific circumstances.

[0111] 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 being 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 being 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.

[0112] The foregoing disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0113] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A pressurizing device for a large-curvature composite sandwich component, characterized by, The device comprises a pressure air bag, a compressed air connecting pipe, a compressed air pressurizer and a fixing assembly. The pressure air bag is placed on the bottom of the large-curvature composite sandwich component and closely adheres to the bottom of the large-curvature composite sandwich component; one end of the compressed air connecting pipe is connected with the air inlet of the pressure air bag, and the other end is connected with the air outlet of the compressed air pressurizer; the fixing assembly is used for fixing the pressure air bag on the bottom of the large-curvature composite sandwich component. The compressed air of the compressed air pressurizer is introduced into the pressure air bag through the compressed air connecting pipe to pressurize the pressure air bag, so that the pressure air bag expands to apply pressure uniformly to the bottom of the large-curvature composite sandwich component. The fixing assembly comprises a fixing buckle, a fixing rod and a fixing cover plate. The fixing buckle is used for fixing the pressure air bag on the bottom of the large-curvature composite sandwich component; one side of the fixing buckle is connected with the fixing rod, and the other side closely adheres to the pressure air bag. The fixing rod is used for connecting the fixing buckle and the fixing cover plate; one end of the fixing rod is connected with the fixing buckle, and the other end penetrates through the fixing cover plate. The fixing cover plate is used for fixing the fixing buckle and the fixing rod; a hole through which the fixing rod penetrates is arranged at the center of the fixing cover plate; and bolts are arranged on both sides of the fixing cover plate to tightly connect the fixing cover plate with the large-curvature composite sandwich component. Sealing gaskets and sealing bolts are arranged at the connection positions of the compressed air connecting pipe with the air inlet of the pressure air bag and the air outlet of the compressed air pressurizer; the sealing gaskets and the sealing bolts are used for sealingly connecting the pressure air bag with the compressed air connecting pipe and the compressed air pressurizer with the compressed air connecting pipe.

2. The apparatus of claim 1, wherein, 3. The device according to claim 1, wherein The pressure air bag is filled with compressed air, and the internal diameter of the expanded pressure air bag ranges from 4 mm to 8 mm. The fixing buckle is an arc-shaped component that closely adheres to the pressure air bag; and the curvature of the fixing buckle ranges from 120° to 170°.

4. The apparatus of claim 1, wherein, The device further comprises at least two groups of guiding assemblies arranged on both sides of the fixing assembly; the guiding assemblies are used for moving the pressure air bag to a target position on the bottom of the large-curvature composite sandwich component.

5. The apparatus of claim 4, wherein, The guiding assembly comprises a linear guide rail, a sliding block and a motor; the linear guide rail is parallel to the reference surface of the large-curvature composite sandwich component; the sliding block is connected with the fixing buckle and is driven by the motor to move the pressure air bag to the target position on the bottom of the large-curvature composite sandwich component along the linear guide rail.

6. The apparatus of claim 5, wherein, The compressed air pressurizer is provided with a pressure display for displaying the pressure value generated by the compressed air introduced into the pressure air bag by the compressed air pressurizer.

7. The apparatus of claim 1, wherein, The system comprises a large-curvature composite sandwich component and a pressurizing device according to any one of claims 1 to 7, wherein the pressurizing device is used for applying pressure uniformly to the bottom of the large-curvature composite sandwich component to eliminate the bottom cavity or delamination caused by the under-pressure of the bottom of the large-curvature composite sandwich component.

8. A pressurization system for a large-curvature composite sandwich component, the pressurization system comprising: ​ ​ A pressure sensor is arranged in the pressure bag of the pressurizing device for the large-curvature composite sandwich component to monitor the air pressure value in the pressure bag in real time and transmit the air pressure value to the computing unit and the controller. The computing unit is configured to calculate the opening adjustment amount of the electromagnetic control valve of the compressed air pressurizer according to the air pressure value and transmit the opening adjustment amount to the controller. The controller is configured to adjust the opening of the electromagnetic control valve of the compressed air pressurizer according to the opening adjustment amount.

9. The system of claim 8, wherein, The controller is further configured to adjust the opening of the electromagnetic control valve of the compressed air pressurizer to supplement the pressure when the air pressure value is monitored to decrease.

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