Pressurizing device and system for large-curvature composite sandwich component

Abstract

The invention 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 interlayer component and tightly attached to the bottom of the large-curvature composite interlayer component. One end of the compressed air connecting pipe is connected with an air inlet of the pressure air bag, and the other end is connected with an air outlet of the compressed air pressurizer; the fixing assembly is used for fixing the pressure air bag to the bottom of the large-curvature composite interlayer component. 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 uniformly apply pressure to the bottom of the large-curvature composite interlayer component. According to the scheme, bottom cavities or layering caused by underpressure of the bottom of the large-curvature composite interlayer component can be eliminated, and therefore the fault rate and the rejection rate are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of composite material manufacturing, and in particular to a pressurizing device and system for large-curvature composite sandwich components. Background Art

[0002] There is a common type of large curvature composite sandwich parts in the materials used in the aerospace, automotive industry, and rail transit fields. The cross-section of this type of parts is U-shaped or V-shaped, so the curvature is large. During the molding process, it is easy to have U-shaped or V-shaped bottom underpressure, resulting in bottom cavity or delamination and other problems, which in turn lead to part failure or scrap. Therefore, how to eliminate the U-shaped or V-shaped bottom underpressure that causes bottom cavity or delamination, thereby reducing the failure rate and scrap rate of large curvature composite sandwich parts is a technical problem that needs to be solved. Summary of the invention

[0003] The present invention provides a pressurizing device and system for a large-curvature composite sandwich component. By pressurizing the underpressure area at the bottom of the large-curvature composite sandwich component, the bottom cavity or delamination caused by underpressure at 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.

[0004] According to a first aspect of an embodiment of the present application, there is provided a pressurizing device for a large curvature composite sandwich component, comprising: a pressure airbag, a compressed air connecting pipe, a compressed air pressurizer, and a fixing assembly; The pressure airbag is placed at the bottom of the large curvature composite sandwich component and is closely attached to the bottom of the large curvature composite sandwich component; one end of the compressed air connecting pipe is connected to the air inlet of the pressure airbag, and the other end is connected to the air outlet of the compressed air pressurizer; the fixing assembly is used to fix the pressure airbag to the bottom of the large curvature composite sandwich component; The compressed air of the compressed air compressor is passed into the pressure airbag through the compressed air connecting pipe to pressurize the pressure airbag so that the pressure airbag expands and applies pressure evenly to the bottom of the large curvature composite sandwich component.

[0005] In one embodiment, a sealing pressure ring and a sealing bolt matching the sealing pressure ring are respectively provided at the connection between the compressed air connecting pipe and the air inlet of the pressure air bag and the air outlet of the compressed air pressurizer; the sealing pressure ring and the sealing bolt are used to seal the pressure air bag and the compressed air connecting pipe, and the compressed air pressurizer and the compressed air connecting pipe.

[0006] In one embodiment, compressed air is introduced into the pressure bag, and the inner diameter of the pressure bag when inflated is in the range of 4-8 mm.

[0007] In one embodiment, the fixing assembly includes: a fixing buckle, used to fix the pressure airbag bag to the bottom of the large curvature composite sandwich component; one side of the fixing buckle is connected to the fixing rod, and the other side is in contact with the pressure airbag bag; a fixing rod, used to connect the fixing buckle and the fixing cover plate; one end of the fixing rod is connected to the fixing buckle, and the other end passes through the fixing cover plate; a fixing cover plate, used to fix the fixing buckle and the fixing rod; a hole for passing the fixing rod is provided in the center of the fixing cover plate; bolts are provided on both sides of the fixing cover plate to tightly connect the fixing cover plate to the large curvature composite sandwich component.

[0008] In one embodiment, the fixing buckle is an arc-shaped component that fits the shape of the pressure airbag; the arc range of the fixing buckle is 120°-170°.

[0009] In one embodiment, the pressurizing device for the large curvature composite sandwich component further includes: at least two sets of guide components, which are respectively arranged on both sides of the fixing component; the guide components are used to move the pressure airbag bag to the target position at the bottom of the large curvature composite sandwich component.

[0010] In one embodiment, the guide assembly includes: a linear guide rail, a slider and a motor; the linear guide rail is parallel to the reference plane of the large curvature composite sandwich component; the slider is connected to the fixing buckle, and is driven by the motor to move the pressure airbag bag along the linear guide rail to the target position at the bottom of the large curvature composite sandwich component.

[0011] In one embodiment, the compressed air pressurizer is provided with a pressure display, and the pressure display is used to display the pressure value generated by the compressed air introduced into the pressure airbag by the compressed air pressurizer.

[0012] According to a second aspect of an embodiment of the present application, a pressurizing system for a large-curvature composite sandwich component is provided, comprising: The pressurizing device for the large curvature composite sandwich component as described in the first aspect is used to apply pressure evenly to the bottom of the large curvature composite sandwich component to eliminate the bottom cavity or delamination caused by underpressure at the bottom of the large curvature composite sandwich component; A pressure sensor is used to monitor the air pressure value in the pressure airbag in real time and transmit the air pressure value to the calculation unit and the controller; the pressure sensor is deployed in the pressure airbag of the pressurizing device for the large curvature composite sandwich component; A calculation unit, used to calculate according to the air pressure value, obtain the opening adjustment amount of the electromagnetic control valve of the compressed air pressurizer, and transmit the opening adjustment amount to the controller; The controller is used to adjust the opening of the electromagnetic control valve of the compressed air booster according to the opening adjustment amount.

[0013] In one embodiment, the controller is also used to adjust the opening of the electromagnetic control valve of the compressed air booster to replenish the pressure when it is monitored that the air pressure value drops.

[0014] According to the solution of the present invention, by pressurizing the underpressure area at the bottom of the large curvature composite sandwich component, the bottom cavity or delamination caused by underpressure at 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.

[0015] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features, advantages and aspects of the embodiments of the present invention will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein: Figure 1 2 is a schematic structural diagram of a pressurizing device for a large-curvature composite sandwich component according to an embodiment of the present invention; Figure 2 It is a cross-sectional schematic diagram of a pressure air bag and a compressed air connecting pipe, and a compressed air pressurizer and a compressed air connecting pipe according to an embodiment of the present invention; Figure 3 is a schematic structural diagram of a guide assembly according to an embodiment of the present invention; Figure 4 It is a schematic structural diagram of a pressurizing system for a large-curvature composite sandwich component according to an embodiment of the present invention.

[0017] Description of reference numerals: 1: Pressure air bag; 2: Compressed air connecting pipe; 3: Compressed air booster; 4: Fixed buckle; 5: Fixed rod; 6: Fix the cover; 7: Honeycomb interlayer; 8: Prepreg; 9: Molding tooling; 10: Sealing ring; 11: Sealing bolt; 12: Linear guide; 13: Slider; 14: Motor. DETAILED DESCRIPTION

[0018] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0019] In the related art, there is a common type of molding tooling (i.e., large curvature composite sandwich components) 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 relatively large. During the molding process, it is easy for the U-shaped or V-shaped bottom to be under-pressurized, resulting in bottom cavities or delamination, and other problems, which in turn lead to part failure or scrap. Taking U-shaped composite honeycomb sandwich components as an example, one of the biggest difficulties in the manufacture of such components is the pressurization problem of the honeycomb sandwich. In particular, the process difficulty increases during the laying of the honeycomb sandwich, which is manifested in that the honeycomb sandwich located at the bottom (i.e., the large curvature area) is difficult to compact in place during the laying process, and it is easy to form gaps between the honeycomb sandwich and the prepreg. Due to the under-pressure at the bottom, it is more likely to cause problems such as bottom cavities or delamination after the parts are cured. The above defects may lead to high failure rates and scrap rates of components.

[0020] In the prior art, the main pressurization method for U-shaped composite sandwich parts is the relatively simple vacuum compaction. In the actual production process, the vacuum compaction operation will be affected by the curvature difference of the part itself or the difference in operation techniques, resulting in great process instability in the vacuum compaction operation. As a result, pores or delamination often appear in the parts after curing, and the failure rate and scrap rate of parts are still high.

[0021] In order to solve the above technical problems, the embodiment of the present invention provides a pressurizing device and system for large curvature composite sandwich components. The pressurizing device for large curvature composite sandwich components includes: a pressure airbag bag, a compressed air connecting pipe, a compressed air pressurizer and a fixing assembly; the pressure airbag bag is placed at the bottom of the large curvature composite sandwich component and is tightly attached to the bottom of the large curvature composite sandwich component; one end of the compressed air connecting pipe is connected to the air inlet of the pressure airbag bag, and the other end is connected to the air outlet of the compressed air pressurizer; the fixing assembly is used to fix the pressure airbag bag to the bottom of the large curvature composite sandwich component; the compressed air of the compressed air pressurizer is passed into the pressure airbag bag through the compressed air connecting pipe to pressurize the pressure airbag bag, so that the pressure airbag bag expands and evenly applies pressure to the bottom of the large curvature composite sandwich component. By pressurizing the underpressure area at the bottom of the large curvature composite sandwich component through any embodiment of the present invention, the bottom cavity or delamination caused by underpressure at 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.

[0022] An embodiment disclosed in the present invention provides a pressurizing device for a large curvature composite sandwich component, such as Figure 1 As shown, the device includes: a pressure airbag bag 1, a compressed air connecting pipe 2, a compressed air pressurizer 3 and a fixing assembly; the pressure airbag bag 1 is placed at the bottom of the large curvature composite sandwich component and is tightly attached 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 airbag 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 airbag bag 1 to the bottom of the large curvature composite sandwich component; the compressed air of the compressed air pressurizer 3 is passed into the pressure airbag bag 1 through the compressed air connecting pipe 2 to pressurize the pressure airbag bag 1, so that the pressure airbag bag 1 expands and applies pressure evenly to the bottom of the large curvature composite sandwich component.

[0023] According to an embodiment disclosed in the present invention, it should be noted that: by Figure 1 For example, the forming tool 9 (i.e., large curvature composite sandwich component) refers to a sandwich structure component made of composite material and having a large curvature (i.e., a large degree of surface curvature). Large curvature refers to a large degree of curvature, such as "U-shaped" or "V-shaped". The sandwich structure of a large curvature composite sandwich component is a structural form in which two relatively thin parallel panels (usually 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 having a "U-shaped" cross-sectional shape and made of a composite honeycomb sandwich structure. The U-shaped composite honeycomb sandwich component is mainly composed of a honeycomb sandwich 7 and a prepreg 8; wherein the honeycomb sandwich 7 is located between two layers of panels and is composed of a number of hexagonal or other shaped honeycomb units; the prepreg 8 is a composite material composed of fibers and resins, and the prepreg 8 is used to make panels and is combined with the honeycomb sandwich 7 by an adhesive.

[0024] by Figure 1 , Figure 3For example, the pressure airbag 1 is a bag or device made of expandable material filled with gas. Preferably, the pressure airbag 1 can be made of rubber material, and the use of rubber material can make the pressure airbag 1 have good pressure resistance and elasticity. In order to meet the use requirements during the curing process, the pressure airbag 1 is made of a special material that can withstand high temperatures above 230°C. The difference between the thermal expansion coefficient of the pressure airbag 1 and the thermal expansion coefficient of the composite prepreg 8 does not exceed 1×10-5 / °C. Compressed air is passed into the pressure airbag 1, and the internal diameter of the pressure airbag 1 is expanded to a range of 4-8mm, the outer diameter is designed to be 3-15mm, and the thickness range is 1-2mm. 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 and contraction, and there will be no problems such as rupture, deformation or elastic attenuation. A high-precision pressure sensor is provided inside the airbag, which can monitor the air pressure value in the airbag in real time and transmit the data to the controller of the pressurization system for large curvature composite sandwich components. A sealing pressure ring 10 and a sealing bolt 11 matching the sealing pressure ring 10 are respectively provided at the connection between the compressed air connecting pipe 2 and the air inlet of the pressure air bag 1 and the air outlet of the compressed air pressurizer 3; the sealing pressure ring 10 and the sealing bolt 11 are used to seal the pressure air bag 1 and the compressed air connecting pipe 2.

[0025] by Figure 1 For example, one end of the compressed air connecting pipe 2 is connected to the pressure air bag 1, and the other end is connected to the compressed air pressurizer 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 transmit compressed air from the compressed air pressurizer 3 to the pressure air bag 1. Here, the size of the compressed air connecting pipe 2 is not specifically limited, and its size can be set according to the distance between the pressure air bag 1 and the compressed air pressurizer 3.

[0026] by Figure 1 For example, the compressed air pressurizer 3 is used to compress the air, output the compressed air, and transmit the compressed air to the pressure airbag 1 through the compressed air connecting pipe 2. The compressed air pressurizer 3 is provided with a pressure display, which is used to monitor the pressure value generated by the introduced compressed air. The working principle of the compressed air pressurizer 3 may include: 1. Piston type: The 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 sucked into the cylinder.

[0027] 2. Turbine type: Use the high-speed rotation of the turbine to compress the gas; when the gas passes through the turbine, the blades of the turbine convert the kinetic energy of the gas into pressure energy, thereby achieving gas compression.

[0028] 3. Screw type: The gas is compressed by the rotation of two intermeshing screws in the shell; when the screws rotate, the space between them gradually decreases, thereby compressing the gas.

[0029] The fixing assembly includes: a fixing buckle 4, which is used to fix the pressure airbag bag 1 to the bottom of the large 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 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 through which the fixing rod 5 can pass is provided in the center of the fixing cover plate 6; bolts are respectively 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.

[0030] The bottom of a large curvature composite sandwich component refers to the lower end or lower surface area of ​​a composite sandwich structure component with a large curvature in the vertical direction. The cross-section of a large curvature composite sandwich component is "U-shaped" or "V-shaped", so the curvature of the bottom of a large curvature composite sandwich component is relatively large; during the molding process, it is easy for the "U-shaped" or "V-shaped" bottom to be under-pressurized, resulting in problems such as bottom cavity or delamination, which in turn leads to part failure or scrap.

[0031] The use of the pressurizing device for large curvature composite sandwich components may include: (1) The pressure airbag 1 is placed at the target position at the bottom of the large curvature composite sandwich component through the guide component and the fixing component, and the pressure airbag 1 is fixed at the target position at 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; (2) The fixed cover plate 6 and the large curvature composite sandwich component are fixedly installed together by bolts, so as to further lock the pressure airbag bag 1 and prevent the pressure airbag bag 1 from bouncing up during the process of pressurizing the large curvature composite sandwich component; (3) Compressed air is passed from the compressed air booster 3 into the pressure air bag 1 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.

[0032] According to an embodiment disclosed in the present invention, by pressurizing the underpressure area at the bottom of the large curvature composite sandwich component using a pressurizing device composed of a pressure airbag, a compressed air connecting pipe, a compressed air pressurizer and a fixing assembly, the bottom cavity or delamination caused by underpressure at 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.

[0033] In one embodiment, a sealing pressure ring 10 and a sealing bolt 11 matching the sealing pressure ring 10 are respectively provided at the connection between the compressed air connecting pipe 2 and the air inlet of the pressure air bag 1 and the air outlet of the compressed air pressurizer 3; the sealing pressure ring 10 and the sealing bolt 11 are used to seal the pressure air bag 1 and the compressed air connecting pipe 2, and the compressed air pressurizer 3 and the compressed air connecting pipe 2.

[0034] According to the embodiments of the present invention, it should be noted that: by Figure 3 For example, the sealing ring 10 is an annular component, and the sealing ring 10 and the sealing bolt 11 cooperate to seal the pressure airbag 1 and the compressed air connecting pipe 2, and the compressed air booster 3 and the compressed air connecting pipe 2 to prevent compressed air from leaking at the connection. The sealing ring 10 is usually made of an elastic material or a metal material with a certain elasticity to ensure that it can produce sufficient deformation when subjected to the tightening force of the sealing bolt 11, so as to fit closely to the surface of the connection.

[0035] by Figure 3 For example, the sealing bolt 11 is a special bolt. Compared with ordinary bolts, the sealing bolt 11 generally has a larger thread diameter and a longer thread length to provide sufficient tightening force and sealing effect. In addition, the head and threaded portion of the sealing bolt 11 may be specially treated to enhance its sealing performance and corrosion resistance.

[0036] According to an embodiment disclosed in the present invention, sealing rings and sealing bolts matching with the sealing rings are respectively provided at the connection points between the compressed air connecting pipe and the air inlet of the pressure air bag and the air outlet of the compressed air pressurizer, so as 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, so as to prevent compressed air leakage at the connection points.

[0037] In one embodiment, compressed air is introduced into the pressure airbag bag 1, and the inner diameter of the pressure airbag bag 1 is expanded to a range of 4-8 mm.

[0038] According to an embodiment disclosed in the present invention, it should be noted that: In practical applications, if the inflatable diameter of the pressure airbag 1 is too large, additional pressure will be applied to the upper part of the bottom, resulting in an unclear pressure difference between the bottom and the upper part of the bottom, and a poor bottom compaction effect; in order to allow the pressure to fully act on the underpressure area at the bottom of the large curvature composite sandwich component; Figure 1 , Figure 3 For example, compressed air is introduced into the pressure airbag bag 1, and the inner diameter of the pressure airbag bag 1 is expanded to a range of 4-8 mm.

[0039] According to an embodiment disclosed in the present invention, by setting the internal diameter range of the expanded pressure airbag to 4-8 mm, the pressure can be fully applied to the underpressure area at the bottom of the large curvature composite sandwich component, thereby improving the pressurization effect on the large curvature composite sandwich component.

[0040] In one embodiment, the fixing assembly includes: a fixing buckle 4, used to fix the pressure airbag bag 1 to the bottom of the large 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 bag 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 through which the fixing rod 5 can pass is provided at the center of the fixing cover plate 6; 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.

[0041] According to an embodiment disclosed in the present invention, it should be noted that: The fixing buckle 4 is used to fix the pressure airbag bag 1 to the bottom of the large 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 in contact with the pressure airbag bag 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 sandwich structural parts of different shapes and sizes, ensuring that the pressure airbag bag 1 can fit tightly to the bottom of the sandwich part and remain in a fixed position during the pressure application process. Here, the size of the fixing buckle 4 is not specifically limited, and its size can be set according to the size of the pressure airbag bag 1.

[0042] The fixing rod 5 is used to connect the fixing buckle 4 and the fixing cover plate 6; Figure 1For 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 tool 9 (i.e., the large curvature composite sandwich component). Exemplarily, the fixing assembly includes: a fixing buckle 4, a fixing rod 5 and a 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. Another exemplary embodiment, the fixing assembly includes: a fixing buckle 4, N fixing rods 5 and a fixing cover plate 6, one end of the N fixing rods 5 is connected to the fixing buckle 4, and the other end passes through the fixing cover plate 6. The spacing distance between the fixing rods 5 ranges from 100 to 500mm, and N is not less than 2. Preferably, the fixing rod 5 is made of high-strength aluminum alloy, and the aluminum alloy material has the characteristics of strong rigidity and light weight. Here, there is no specific limitation on the length of the fixing rod 5 , and the length can be set according to the height of the forming tool 9 .

[0043] The fixing cover plate 6 is used to fix the fixing buckle 4 and the fixing rod 5; Figure 1 For example, a hole through which the fixing rod 5 can pass is provided in the center of the fixed cover plate 6; bolts are provided on both sides of the fixed cover plate 6 to tightly connect the fixed cover plate 6 with the large curvature composite sandwich component, so that the pressure generated by the pressure airbag bag 1 can better act on the bottom of the large curvature composite sandwich component and will not bounce upward. The fixed cover plate 6 is made of the same steel material as the fixing buckle 4 and the fixing rod 5. Preferably, the fixed cover plate 6 is made of high-strength aluminum alloy, which has the characteristics of strong rigidity and light weight. Here, the shape and size of the fixed cover plate 6 are not specifically limited, and its shape and size can be set according to the shape and size of the forming tooling 9.

[0044] According to an embodiment disclosed in the present invention, a fixing assembly consisting of a fixing buckle, a fixing rod and a fixing cover plate can provide a stable support platform for the pressure airbag bag, which helps to improve the stability of pressurization of large curvature composite sandwich components.

[0045] In one embodiment, the fixing buckle 4 is an arc-shaped component that fits the shape of the pressure airbag 1; the arc range of the fixing buckle 4 is 120°-170°.

[0046] According to an embodiment disclosed in the present invention, it should be noted that: The fixing buckle 4 needs to have certain rigidity and strength, and the difference between its expansion coefficient and the thermal expansion coefficient of the pressure airbag bag 1 does not exceed 1×10-5 / °C. Preferably, the fixing buckle 4 can be made of steel material; the curvature of the fixing buckle 4 is 120°-170°; the thickness of the fixing buckle 4 is 2-5mm; so as to ensure that the fixing buckle 4 only contacts the pressure airbag 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 fixing buckle 4.

[0047] According to an embodiment disclosed in the present invention, by setting the fixing buckle to an arc shape, it can better fit the shape of the pressure airbag bag, thereby improving the effect of the fixing assembly in fixing the pressure airbag bag.

[0048] In one embodiment, the pressurizing device for the large curvature composite sandwich component further includes: at least two sets of guide components, which are respectively arranged on both sides of the fixing component; the guide components are used to move the pressure airbag bag 1 to the target position at the bottom of the large curvature composite sandwich component.

[0049] According to an embodiment disclosed in the present invention, it should be noted that: by Figure 3 For 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.

[0050] According to an embodiment disclosed in the present invention, a guide assembly composed of a high-precision linear guide rail, a slider and a motor can be used to move the pressure airbag bag to the target position at the bottom of the large-curvature composite sandwich component, thereby improving the accuracy of pressurizing the underpressure area at the bottom of the large-curvature composite sandwich component.

[0051] 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 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 rail 12 to the target position at the bottom of the large curvature composite sandwich component.

[0052] According to an embodiment disclosed in the present invention, it should be noted that: by Figure 3 For example, a 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, compact structure, and because the screw nut has high matching accuracy, it can achieve high positioning accuracy and high-speed motion performance.

[0053] by Figure 3 For example, the slide block 13 is a sliding element matched with the linear guide rail 12, and is used to support and guide the fixed assembly and the pressure airbag 1 to move on the linear guide rail 12. The material of the slide block 13 itself has appropriate hardness and wear resistance, which is sufficient to withstand the friction of moving on the linear guide rail 12.

[0054] by Figure 3 For example, the motor 14 is used to provide a power source for the slider 13 to move in the linear guide 12, and drives the slider 13 to perform reciprocating linear motion on the linear guide 12. The motor 14 can be a DC motor, an AC motor, a stepper motor, etc. Here, the type of the motor 14 is not limited, and its type can be selected according to needs.

[0055] The target position is where underpressure occurs at the bottom of the composite sandwich component with large curvature.

[0056] According to an embodiment disclosed in the present invention, the pressure airbag can be moved to the underpressure position at the bottom of the large curvature composite sandwich component through the guide assembly, which helps to improve the accuracy of pressurizing the large curvature composite sandwich component.

[0057] In one embodiment, the compressed air pressurizer 3 is provided with a pressure display, and the pressure display is used to display the pressure value generated by the compressed air introduced into the pressure airbag bag 1 by the compressed air pressurizer 3 .

[0058] According to an embodiment disclosed in the present invention, it should be noted that: The pressure display is a device for displaying pressure values; the pressure display is a digital or analog instrument that can display in real time the pressure value generated by the compressed air introduced by the compressed air pressurizer 3 into the pressure airbag 1. 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.

[0059] According to an embodiment disclosed in the present invention, the pressure value generated by the compressed air introduced into the pressure airbag by the compressed air pressurizer can be displayed in real time and intuitively through a pressure display, which helps to improve the accuracy of the pressurizing device for large-curvature composite sandwich components.

[0060] An embodiment disclosed in the present invention provides a pressurizing system for a large curvature composite sandwich component, such as Figure 4 As shown, the system includes: A pressurizing device for a large curvature composite sandwich component, used to apply pressure evenly to the bottom of the large curvature composite sandwich component to eliminate the bottom cavity or delamination caused by underpressure at the bottom of the large curvature composite sandwich component; A pressure sensor is used to monitor the air pressure value in the pressure airbag bag 1 in real time and transmit the air pressure value to the calculation unit and the controller; the pressure sensor is deployed in the pressure airbag bag 1 of the pressurizing device for the large curvature composite sandwich component; A calculation unit, used to calculate according to the air pressure value, obtain the opening adjustment amount of the electromagnetic control valve of the compressed air pressurizer 3, and transmit the opening adjustment amount to the controller; The controller is used to adjust the opening of the electromagnetic control valve of the compressed air booster 3 according to the opening adjustment amount.

[0061] The pressurizing device for large-curvature composite sandwich components is the pressurizing device for large-curvature composite sandwich components described above.

[0062] In one embodiment, the pressure sensor is used to monitor the air pressure value in the pressure airbag bag 1 in real time and transmit the air pressure value to the calculation unit and the controller; the distance sensor can be a resonant sensor, an electromagnetic sensor or a piezoelectric sensor, etc. Here, the type of the pressure sensor is not specifically limited, and its type can be set according to needs.

[0063] In one embodiment, the pressurizing system for the large curvature composite sandwich component is started, and the motor 14 drives the slider 13 according to the command of the preset target position to drive the fixing device and the pressure airbag 1 to move to the target position. The electromagnetic control valve of the compressed air pressurizer 3 begins to open slowly according to the control signal of the controller, and the compressed air gradually fills the pressure airbag 1. The pressure sensor monitors the air pressure value in the airbag in real time and transmits the air pressure value to the calculation unit and the controller. The controller calculates the opening adjustment amount of the electromagnetic control valve based on the received pressure value and the calculation unit based on the pressure value to achieve precise control of the pressurization. When the pressure reaches the preset target pressure value, the electromagnetic control valve maintains the current opening to stabilize the pressure within the preset range. During the pressurization process, the pressure airbag 1 deforms adaptively as the curvature of the bottom of the large curvature composite sandwich component changes. Through the fixing effect of the fixing device, the pressure is evenly applied to the bottom of the large curvature composite sandwich component, effectively eliminating the bottom cavity or delamination caused by underpressure at the bottom of the large curvature composite sandwich component.

[0064] According to an embodiment disclosed by the present invention, by pressurizing the underpressure area at the bottom of the large curvature composite sandwich component, the bottom cavity or delamination caused by underpressure at 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 air pressure value provided by the pressure sensor to obtain the opening adjustment amount of the electromagnetic control valve of the compressed air pressurizer, the accuracy of pressurizing the underpressure area at the bottom of the large curvature composite sandwich component can be improved.

[0065] In one embodiment, the controller is also used to adjust the opening of the electromagnetic control valve of the compressed air booster 3 to supplement the pressure when it is monitored that the air pressure value drops.

[0066] In one embodiment, the pressure holding operation is performed according to a preset pressure application time. During the pressure holding period, the pressure value is continuously monitored by the pressurizing system of the large curvature composite sandwich component. If a downward trend is found in the pressure value, the opening of the electromagnetic control valve of the compressed air pressurizer 3 is adjusted to supplement the pressure to ensure that the pressure is stable during the entire pressure holding process. At the same time, during the pressure holding process, according to the process requirements, the motor 14 can be used to drive the pressure airbag 1 to perform a small reciprocating movement or vibration within a certain range, so as to further promote the compaction and bonding effect of the material and improve the quality of the parts. When the pressure holding time is over, the electromagnetic control valve of the compressed air pressurizer 3 is slowly closed to release the compressed air in the pressure airbag 1. The motor 14 drives the pressure airbag 1 to move to the initial position so that the processed large curvature composite sandwich component can be taken out.

[0067] According to an embodiment disclosed in the present invention, the opening of the electromagnetic control valve can be accurately adjusted according to the change of the air pressure value, which helps to avoid damage to large-curvature composite sandwich components caused by excessively high or low air pressure, and improves the stability and reliability of pressurization of large-curvature composite sandwich components using a pressurization system.

[0068] In the description of this specification, it should be understood that, unless otherwise expressly specified and limited, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0072] The disclosure above provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0073] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressurizing device for large curvature composite sandwich components, characterized in that: include: Pressure air bag, compressed air connecting pipe, compressed air booster and fixing components; The pressure airbag is placed at the bottom of the large curvature composite sandwich component and is closely attached to the bottom of the large curvature composite sandwich component; one end of the compressed air connecting pipe is connected to the air inlet of the pressure airbag, and the other end is connected to the air outlet of the compressed air pressurizer; the fixing assembly is used to fix the pressure airbag to the bottom of the large curvature composite sandwich component; The compressed air from the compressed air compressor is passed through the compressed air connecting pipe into the pressure airbag bag to pressurize the pressure airbag bag, so that the pressure airbag bag expands and applies pressure evenly to the bottom of the large-curvature composite sandwich component.

2. The device according to claim 1, characterized in that The connection between the compressed air connecting pipe and the air inlet of the pressure air bag and the air outlet of the compressed air pressurizer are respectively provided with a sealing pressure ring and a sealing bolt matching the sealing pressure ring; the sealing pressure ring and the sealing bolt are used to seal the pressure air bag and the compressed air connecting pipe, and the compressed air pressurizer and the compressed air connecting pipe.

3. The device according to claim 2, characterized in that Compressed air is introduced into the pressure airbag, and the inner diameter of the pressure airbag is expanded to a range of 4-8 mm.

4. The device according to claim 1, characterized in that The fixing assembly comprises: A fixing buckle, used to fix the pressure airbag bag to the bottom of the large curvature composite sandwich component; one side of the fixing buckle is connected to the fixing rod, and the other side is in contact with the pressure airbag bag; The fixing rod is used to connect the fixing buckle and the fixing cover plate; one end of the fixing rod is connected to the fixing buckle, and the other end passes through the fixing cover plate; A fixed cover plate is used to fix the fixing buckle and the fixing rod; a hole through which the fixing rod can pass is arranged at the center of the fixed cover plate; bolts are arranged on both sides of the fixed cover plate to tightly connect the fixed cover plate with the large curvature composite sandwich component.

5. The device according to claim 4, characterized in that The fixing buckle is an arc-shaped component that fits the shape of the pressure airbag; the arc range of the fixing buckle is 120°-170°.

6. The device according to claim 5, characterized in that The device further comprises: at least two groups of guide assemblies, which are respectively arranged on both sides of the fixing assembly; the guide assemblies are used to move the pressure airbag bag to a target position at the bottom of the large curvature composite sandwich component.

7. The device according to claim 6, characterized in that The guide assembly includes: a linear guide rail, a slider and a motor; the linear guide rail is parallel to the reference plane of the large curvature composite sandwich component; the slider is connected to the fixing buckle, and is driven by the motor to move the pressure airbag bag along the linear guide rail to the target position at the bottom of the large curvature composite sandwich component.

8. The device according to claim 1, characterized in that The compressed air pressurizer is provided with a pressure display, and the pressure display is used to display the pressure value generated by the compressed air introduced into the pressure airbag by the compressed air pressurizer.

9. A pressurizing system for large curvature composite sandwich components, characterized in that: The system comprises: The pressurizing device for a large curvature composite sandwich component according to any one of claims 1 to 8, used to apply pressure evenly to the bottom of the large curvature composite sandwich component to eliminate the bottom cavity or delamination caused by underpressure at the bottom of the large curvature composite sandwich component; A pressure sensor is used to monitor the air pressure value in the pressure airbag in real time and transmit the air pressure value to the calculation unit and the controller; the pressure sensor is deployed in the pressure airbag of the pressurizing device for the large curvature composite sandwich component; The calculation unit is used to calculate according to the air pressure value to obtain the opening adjustment amount of the electromagnetic control valve of the compressed air pressurizer, and transmit the opening adjustment amount to the controller; The controller is used to adjust the opening of the electromagnetic control valve of the compressed air pressurizer according to the opening adjustment amount.

10. The system according to claim 9, characterized in that The controller is also used to adjust the opening of the electromagnetic control valve of the compressed air booster to replenish the pressure when it is monitored that the air pressure value drops.

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