Composite material clamp and manufacturing method thereof

Abstract

The invention relates to the field of emergency repair of leaked pipelines, in particular to a composite material clamp and a manufacturing method thereof, and aims to relieve the technical problem that the sealing performance of a traditional sleeve clamp is reduced under high pressure. The composite material clamp comprises two arc-shaped shells, and the two arc-shaped shells can define a containing channel matched with a pipeline under the butt joint working condition. The arc-shaped shell sequentially comprises a base layer, a framework layer and a reinforcing layer from inside to outside. The base layer comprises biaxial high-modulus glass cloth which is stacked layer by layer; the framework layer is clamped on the base layer; the reinforcing layer comprises biaxial high-modulus glass cloth and carbon fiber biaxial fabric which are stacked layer by layer and laid on the framework layer and the base layer, and the reinforcing layer, the framework layer and the base layer are connected through resin curing. According to the composite material clamp, the advantages of two materials are combined, meanwhile, the framework layer serves as a prefabricated part to serve as a keel of the whole clamp, through the design, the strength and sealing performance of the clamp are improved, inevitable deformation can be reduced, and the composite material clamp can meet the requirement for higher pressure.

Description

Technical Field

[0001] This invention relates to the field of emergency repair of leaking pipelines, and in particular to a composite material clamp and its manufacturing method. Background Technology

[0002] In the repair of leaks in oil pipelines, traditional casing clamps are generally used for sealing. The main types of traditional casing clamps are steel clamps, cast iron clamps, and alloy steel clamps. The common feature of these clamps is that they can provide necessary support and sealing in the rapid repair of pipelines.

[0003] However, traditional casing clamps still have many shortcomings in practical use, such as: under high pressure, the casing clamp will bear greater pressure and deformation due to the greater load force inside the pipeline, resulting in a decrease in its clamping force and thus reducing the sealing performance; high pressure inside the pipeline will cause elastic deformation of the casing clamp, especially under long-term high pressure load, which may cause the casing clamp to change shape and lose its original tight fit, resulting in leakage; under high pressure, the casing clamp may be compressed, causing its volume to shrink, thus reducing the sealing effect; pressure and pressure load may cause the leakage path between the casing clamp and the surface of the adjacent pipeline to expand or deform, resulting in more media leakage and further reducing the sealing performance. Summary of the Invention

[0004] The purpose of this invention is to provide a composite material clamp and its manufacturing method to alleviate the technical problem of reduced sealing performance of traditional sleeve clamps under high pressure in related technologies.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] In a first aspect, the composite material clamp provided by the present invention includes: two arc-shaped shells, which can be enclosed to form a receiving channel adapted to the pipeline under docking conditions;

[0007] From the inside out, the arc-shaped shell sequentially comprises a base layer, a skeleton layer, and a reinforcing layer;

[0008] The base layer comprises multiple stacked biaxial high-modulus glass cloths;

[0009] The skeleton layer is snapped onto the base layer;

[0010] The reinforcing layer comprises layers of stacked biaxial high-modulus glass cloth and biaxial carbon fiber fabric, and is laid on the skeleton layer and the base layer. The reinforcing layer, the skeleton layer and the base layer are connected by resin curing.

[0011] Furthermore, the base layer has a sealing groove on its surface that encloses the receiving channel, and the sealing groove extends along the axial direction of the arc-shaped shell;

[0012] The composite material fixture also includes a sealing ring, which is embedded in the sealing groove.

[0013] Furthermore, the sealing ring is made of TPU material and has a double-layer sealing structure.

[0014] Furthermore, flanges are provided at both ends of the base layer.

[0015] Furthermore, in the base layer, multiple pieces of the biaxial high-modulus glass cloth are laid in the order of (0°, 90°)G3 layer and (±45°)G1 layer, and are laid at least once.

[0016] Furthermore, the skeleton layer includes longitudinal ribs and multiple arc-shaped ribs;

[0017] The longitudinal reinforcement extends axially along the base layer, with its two ends extending to the flange respectively;

[0018] Along the length of the longitudinal rib, a plurality of the arc-shaped ribs are distributed in parallel and are all fixed to the longitudinal rib.

[0019] Furthermore, biaxial carbon fiber cloth is filled between both ends of the longitudinal rib and the two flanges.

[0020] The space between the arc-shaped rib and the surface of the base layer is filled with unidirectional carbon fiber cloth.

[0021] Furthermore, the reinforcing layer is provided with a reserved groove, which is adapted to the skeleton layer;

[0022] In the reinforcing layer, the biaxial high-modulus glass cloth and the carbon fiber biaxial fabric are laid in the order of (0°, 90°)G, (±45°)G, (0°, 90°)C, and are laid at least once.

[0023] Furthermore, the arc-shaped shell is provided with two sets of mounting holes symmetrically distributed about its axis, and in each set, multiple mounting holes are distributed at intervals along the axis of the arc-shaped shell and all penetrate the base layer, the skeleton layer and the reinforcing layer;

[0024] The base layer, the skeleton layer, and the reinforcing layer are fixedly connected by bolts passing through the mounting holes.

[0025] Secondly, the composite material fixture manufacturing method provided by the present invention is used to manufacture the composite material fixture described above, and includes the following steps;

[0026] Prepare the mold: Install a sealing strip on the outer edge of the upper surface of the mold, install a spiral air extraction pipe on the upper surface of the mold inside the sealing strip, and set an air extraction port at one end of the spiral air extraction pipe. Then install a vacuum bag on the upper surface of the mold, and the vacuum bag covers the area surrounded by the sealing strip. At the same time, apply a release agent to the upper surface of the mold inside the sealing strip.

[0027] Material laying: The biaxial high modulus glass cloth is laid in the order of (0°, 90°)G3 layer and (±45°)G1 layer, and the cycle is repeated every four layers. Then, the skeleton layer is placed, followed by the laying of biaxial high modulus glass cloth, uniaxial high modulus glass cloth, biaxial carbon fiber fabric and uniaxial carbon fiber fabric. Biaxial carbon fiber cloth is laid on the end face of the longitudinal ribs in the order of (0°, 90°)G, (±45°)G, (0°, 90°)C. Uniaxial carbon fiber cloth is laid at the contact position between the arc rib and the upper end face of the base layer in the order of 0°G, 0°c. Then, the biaxial high modulus glass cloth and biaxial carbon fiber fabric are laid in the order of (0°, 90°)G, (±45°)G, (0°, 90°)C, and the cycle is repeated every three layers.

[0028] Resin injection: Vacuuming is performed between the vacuum bag and the mold through the vacuum port and the spiral vacuum tube using a vacuuming device. After vacuuming is completed, resin is injected. The injection environment is room temperature, and the operation time is ≥120min.

[0029] Demolding and finishing: After resin injection and cooling, the finished product is taken out and a sealing ring is embedded in the sealing groove of the finished product. Mounting holes are opened on the finished product and bolt sleeves are embedded in the mounting holes.

[0030] In summary, the technical effects achieved by the composite material fixture provided by this invention are as follows:

[0031] In this composite material fixture, the arc-shaped shell that makes up the fixture is divided into three layers, from the inside out: a base layer, a skeleton layer, and a reinforcing layer. The base layer is made of multiple layers of biaxial high-modulus glass cloth, the reinforcing layer is made of multiple layers of biaxial high-modulus glass cloth and biaxial carbon fiber fabric, and the skeleton layer is located between the base layer and the reinforcing layer, serving as a supporting framework. Taking advantage of the good wettability of resin to the reinforcing material, the base layer and the reinforcing layer form a skin, and the base layer, skeleton layer, and reinforcing layer are molded into a single unit under the action of resin.

[0032] As can be seen, compared with the existing technology, this composite material fixture combines the advantages of two materials: biaxial high modulus glass cloth and carbon fiber biaxial fabric. At the same time, the skeleton layer is used as a prefabricated part to form the keel of the entire fixture. This design improves the strength and sealing performance of the composite material fixture, reduces unavoidable deformation, and enables it to meet the requirements of higher pressure. Attached Figure Description

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

[0034] Figure 1 This is a schematic diagram of the composite material fixture provided in an embodiment of the present invention;

[0035] Figure 2 A cross-sectional schematic diagram of the composite material fixture provided in an embodiment of the present invention;

[0036] Figure 3 for Figure 2 Enlarged view of point I;

[0037] Figure 4 and Figure 5 These are schematic diagrams of the basic layer provided in the embodiments of the present invention at different angles;

[0038] Figure 6 This is a schematic diagram of the skeleton layer provided in an embodiment of the present invention;

[0039] Figure 7 and Figure 8 These are schematic diagrams of the reinforcing layer provided in the embodiments of the present invention at different angles;

[0040] Figure 9 Information infographics related to glass fiber and carbon fiber;

[0041] Figure 10 This is a schematic diagram of the loading conditions of the composite material fixture provided in an embodiment of the present invention;

[0042] Figure 11 The total deformation cloud diagram of the composite material fixture provided in the embodiment of the present invention;

[0043] Figure 12 Vertical displacement cloud diagram and vertical displacement cloud diagram at the interface of the composite material fixture provided in the embodiments of the present invention;

[0044] Figure 13 The maximum stress cloud diagram and the local stress cloud diagram at the maximum value of the composite material fixture provided in the embodiments of the present invention are shown.

[0045] Icons: 1-Base layer; 11-Sealing groove; 12-Flange;

[0046] 2-Skeleton layer; 21-Longitudinal reinforcement; 22-Arched reinforcement;

[0047] 3-Reinforcing layer; 31-Reserved slot;

[0048] 4-Sealing ring; 5-Mounting hole; 6-Bolt sleeve. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0051] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0052] Traditional casing clamps have several shortcomings in practical use, such as: under high pressure, the casing clamps will be subjected to greater pressure and deformation due to the greater load force inside the pipeline, resulting in a decrease in clamping force and thus reducing sealing performance; high pressure inside the pipeline will cause elastic deformation of the casing clamps, especially under prolonged high pressure loads, which may lead to changes in the shape of the casing clamps, losing their original tight fit and causing leakage; under high pressure, the casing clamps may compress, causing their volume to shrink, thus reducing the sealing effect; pressure and pressure loads may cause the leakage path between the casing clamp and the adjacent pipeline surface to expand or deform, resulting in more media leakage and further reducing sealing performance.

[0053] In view of this, the present invention provides a composite material clamp, comprising two arc-shaped shells, which can be closed to form a receiving channel adapted to the pipeline under docking conditions; from the inside to the outside, the arc-shaped shells sequentially comprise a base layer 1, a skeleton layer 2, and a reinforcing layer 3; the base layer 1 comprises multiple stacked biaxial high modulus glass cloths; the skeleton layer 2 is snapped onto the base layer 1; the reinforcing layer 3 comprises stacked biaxial high modulus glass cloths and carbon fiber biaxial fabrics, and is laid on the skeleton layer 2 and the base layer 1, and the reinforcing layer 3, the skeleton layer 2, and the base layer 1 are connected by resin curing.

[0054] In this composite material fixture, the arc-shaped shell that makes up the fixture is divided into three layers, from the inside out: a base layer 1, a skeleton layer 2, and a reinforcing layer 3. The base layer 1 is made of multiple layers of biaxial high-modulus glass cloth, the reinforcing layer 3 is made of multiple layers of biaxial high-modulus glass cloth and biaxial carbon fiber fabric, and the skeleton layer 2 is located between the base layer 1 and the reinforcing layer 3, serving as a keel support. Taking advantage of the good wettability of resin to the reinforcing material, the base layer 1 and the reinforcing layer 3 form a skin, and the base layer 1, skeleton layer 2, and reinforcing layer 3 are molded into one piece under the action of resin.

[0055] As can be seen, compared with the existing technology, this composite material fixture combines the advantages of two materials: biaxial high modulus glass cloth and carbon fiber biaxial fabric. At the same time, the skeleton layer 2 is used as a prefabricated part to form the keel of the entire fixture. This design improves the strength and sealing performance of the composite material fixture, reduces unavoidable deformation, and enables it to meet the requirements of higher pressure.

[0056] The following combination Figures 1 to 8 The structure and shape of the composite material fixture provided in this embodiment are described in detail below:

[0057] Regarding the basic layer 1, specifically:

[0058] refer to Figures 1 to 5 Flanges 12 are provided at both ends of the base layer 1. This design increases the strength of both ends of the base layer 1, prevents the ends from warping after the upper and lower molds are closed, and reduces the possibility of deformation by utilizing the arc-shaped stress distribution.

[0059] As mentioned above, the outer edge of the arc-shaped groove of the base layer 1 is provided with a sealing groove 11, and a sealing ring 4 is embedded in the sealing groove 11; more preferably, the sealing ring 4 is made of TPU (thermoplastic polyurethane elastomer) material and has a double-layer sealing structure, that is, compared with the traditional O-shaped cross section, its cross section can be regarded as "8" shaped.

[0060] In the above design, the double-layer sealing structure can form a sealed space between the two sealing strips, effectively preventing the leakage of the medium and increasing the pressure resistance of the sealing ring 4. At the same time, combined with the durability and anti-aging properties of TPU material, the service life and reliability of the sealing ring 4 can be improved.

[0061] Continuing from the above, when laying the base layer 1, multiple pieces of biaxial high-modulus glass cloth are laid in the order of (0°, 90°) G3 layer and (±45°) G1 layer, with each cycle consisting of four layers. The specific number of cycles can be determined according to the preset thickness of the base layer 1. Optionally, except for the sealing groove 11, the thickness of the base layer 1 is 36 mm.

[0062] By adopting the above layup sequence, the performance of the composite material can be optimized, so that it has good strength and stiffness in different directions, that is, the base layer 1 has good strength and stiffness in different directions.

[0063] Regarding skeleton layer 2, specifically:

[0064] refer to Figure 6 The skeleton layer 2 includes longitudinal ribs 21 and multiple arc-shaped ribs 22; the longitudinal ribs 21 extend along the axial direction of the base layer 1, and their two ends extend to the flange 12 respectively; in the length direction of the longitudinal ribs 21, multiple arc-shaped ribs 22 are distributed in parallel and are all fixed to the longitudinal ribs 21.

[0065] Specifically, in combination Figures 1 to 3 As shown, both the longitudinal rib 21 and the arc rib 22 are made of metal, such as iron, steel or alloy steel; optionally, the longitudinal rib 21 is 25 mm thick and the length of the longitudinal rib 21 matches the spacing between the two flanges 12 on the base layer 1; optionally, there are three arc ribs 22, each 28 mm thick, which are welded equidistantly to the longitudinal rib 21.

[0066] As mentioned above, biaxial carbon fiber cloth is filled between both ends of the longitudinal rib 21 and the two flanges 12. The biaxial carbon fiber cloth is laid in the order of (0°, 90°)G, (±45°)G, and (0°, 90°)C. Unidirectional carbon fiber cloth is filled between the arc rib 22 and the surface of the base layer 1. The unidirectional carbon fiber cloth is laid in the order of 0°G and 0°C.

[0067] In the above design, welding can provide good connection strength, enabling the longitudinal ribs 21 and arc ribs 22 to withstand external loads and stresses, thereby enhancing the structural stability and strength of the fixture and effectively improving its mechanical properties; the longitudinal ribs 21 and arc ribs 22 are fixed in the fixture, which can increase the overall stability and rigidity of the fixture; the laying of biaxial carbon fiber cloth and unidirectional carbon fiber cloth between the skeleton layer 2 and the base layer 1 can effectively improve the bonding performance between the two.

[0068] Regarding reinforcement layer 3, specifically:

[0069] refer to Figures 7 to 8 The reinforcing layer 3 is provided with a reserved groove 31, which is adapted to the skeleton layer 2. In the reinforcing layer 3, the biaxial high modulus glass cloth and the carbon fiber biaxial fabric are laid in the order of (0°,90°)G, (±45°)G, (0°,90°)C, and are laid at least once.

[0070] Specifically, when laying the reinforcing layer 3, every three layers constitute one cycle, and the specific number of cycles can be determined according to the preset thickness of the reinforcing layer 3. Optionally, the thickness of the reinforcing layer 3 is 16 mm. This design can optimize the performance of the biaxial high-modulus glass cloth and the carbon fiber biaxial fabric, so that the reinforcing layer 3 has good strength and stiffness in different directions.

[0071] Furthermore, in combination Figures 1 to 8 As shown, mounting holes 5 are provided on both sides of the base layer 1, at both ends of the arc-shaped rib 22, and on both sides of the reinforcing layer 3; bolt sleeves 6 are embedded in the mounting holes 5, and M30 bolts are inserted into the bolt sleeves 6.

[0072] In the above design, the mutual matching of mounting holes 5 and the embedding of bolt sleeves 6 ensure the overall structural connection between the base layer 1, the arc rib 22 and the reinforcing layer 3; bolt sleeves 6 provide reliable fixing points, and the components of different layers are tightly connected together by bolts, which enhances the overall stability and rigidity of the fixture; by using bolt sleeves 6 and matching M30 bolts, the fixture can be easily disassembled and reinstalled; bolt sleeves 6 and bolts on the base layer 1, arc rib 22 and reinforcing layer 3 provide multiple fixing points, which can distribute the load and reduce the bearing pressure of welded joints or single connection points.

[0073] The present invention also provides a method for manufacturing a composite material fixture, the method comprising the following steps:

[0074] Prepare the mold: Install a sealing strip on the outer edge of the upper surface of the mold, install a spiral air extraction pipe on the upper surface of the mold inside the sealing strip, and set an air extraction port at one end of the spiral air extraction pipe. Then install a vacuum bag on the upper surface of the mold, and the vacuum bag covers the area surrounded by the sealing strip. At the same time, apply a release agent to the upper surface of the mold inside the sealing strip.

[0075] Material Laying: The biaxial high-modulus glass cloth is laid in the order of (0°, 90°)G3 layer, (±45°)G1 layer, and repeated every four layers. Then, the skeleton layer 2 is placed. On the skeleton layer 2, biaxial high-modulus glass cloth, uniaxial high-modulus glass cloth, biaxial carbon fiber fabric, and uniaxial carbon fiber fabric are laid. Biaxial carbon fiber cloth is laid on the end face of the longitudinal rib 21 in the order of (0°, 90°)G, (±45°)G, (0°, 90°)C. The laying process involves laying unidirectional carbon fiber cloth at the contact position between the arc-shaped rib 22 and the upper end face of the base layer 1. The unidirectional carbon fiber cloth is laid in the order of 0°G and 0°C. Then, biaxial high modulus glass cloth and biaxial carbon fiber fabric are laid in the order of (0°, 90°)G, (±45°)G, and (0°, 90°)C, and the cycle is repeated every three layers. After the reinforcing layer 3 is laid, a reserved groove 31 is formed on the inner side of the reinforcing layer 3. The size of the reserved groove 31 matches the size of the skeleton layer 2.

[0076] Resin injection: Vacuuming is performed between the vacuum bag and the mold through the vacuum port and the spiral vacuum tube using a vacuuming device. After vacuuming is completed, resin is injected. The injection environment is room temperature, and the operation time is ≥120min.

[0077] Demolding and finishing: After resin injection and cooling, the finished product is taken out and a sealing ring 4 is embedded in the sealing groove 11 of the finished product. An installation hole 5 is opened on the finished product and a bolt sleeve 6 is embedded in the installation hole 5.

[0078] As mentioned above, in the material laying process, the fibers need to meet the following basic requirements: a laying method using a mixture of glass fiber and carbon fiber should be adopted. For specific information, please refer to [link / reference needed]. Figure 9 Preferably, high-modulus glass fiber, T700 grade carbon fiber biaxial fabric, and uniaxial fabric are selected for laying and applied to different structural parts. During the resin injection step, the resin needs to meet the following basic requirements: the resin viscosity at room temperature should be 100-300 mPas; too high or too low a resin viscosity may cause poor fiber wetting; depending on the size of the product and the injection process, the resin must have a certain working time, requiring a working time of ≥120 min at room temperature (25℃); the resin shrinkage rate should be low, as excessive shrinkage will increase porosity and the probability of product cracking.

[0079] By employing the above steps and the working principle of vacuum bag laying and resin injection, composite material jigs can be manufactured. The vacuum bag extraction operation removes air and creates a compaction effect, while the resin injection fills the gaps in the fiber material and cures, ultimately forming a jig structure with both strength and rigidity. This manufacturing method ensures uniform density inside the jig and allows for control over the resin filling and curing process.

[0080] As mentioned above, this manufacturing method, by selecting high-modulus glass fiber and carbon fiber cloth for laying, combines the advantages of the two materials, improves the strength and sealing performance of the composite material clamp, can meet the requirements of higher pressure, can solve the shortcomings of traditional sleeve clamps in terms of materials, and can achieve a balance in terms of strength, stiffness, weight, corrosion resistance and cost-effectiveness of composite material clamps, and provides good impact resistance.

[0081] refer to Figures 10 to 13 For the composite material clamps manufactured using the above method, when analyzing their stress conditions, the internal design pressure of the sealing ring 4 is >15MPa, indicating its applicability to a wider range of pipelines; the total deformation cloud diagram of the clamp under operating conditions is shown below. Figure 11 As shown, the maximum deformation is 2.35 mm; the maximum vertical deformation is 2.34 mm; the strain at position 4 of the sealing ring is between 0.8415 and 1.0548 mm. (Specific details are as follows...) Figure 12 As shown; the maximum value of the maximum principal stress is 374.99 MPa, as... Figure 13As shown, it is located at the connection between the wall and flange 12.

[0082] It should be noted that the mold used in this composite material fixture manufacturing method is an existing structure, and the VARI (Vacuum Assisted Resin Infusion) process is adopted for the one-piece molding process. For any deficiencies in the mold preparation step, please refer to the existing technology.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite material clamp, characterized in that, include: Two arc-shaped shells, which can be closed together to form a receiving channel adapted to the pipeline under docking conditions; From the inside out, the arc-shaped shell sequentially includes a base layer (1), a skeleton layer (2), and a reinforcing layer (3); The base layer (1) comprises multiple layers of biaxial high-modulus glass cloth stacked together; The skeleton layer (2) is snapped onto the base layer (1); The reinforcing layer (3) comprises layers of biaxial high modulus glass cloth and carbon fiber biaxial fabric, which are stacked and laid on the skeleton layer (2) and the base layer (1). The reinforcing layer (3), the skeleton layer (2) and the base layer (1) are connected by resin curing.

2. The composite material clamp according to claim 1, characterized in that, The base layer (1) has a sealing groove (11) on its surface for enclosing the receiving channel, and the sealing groove (11) extends along the axial direction of the arc-shaped shell; The composite material fixture also includes a sealing ring (4), which is embedded in the sealing groove (11).

3. The composite material clamp according to claim 2, characterized in that, The sealing ring (4) is made of TPU material and has a double-layer sealing structure.

4. The composite material clamp according to claim 1, characterized in that, Flanges (12) are provided at both ends of the base layer (1).

5. The composite material clamp according to claim 4, characterized in that, In the base layer (1), multiple pieces of the biaxial high modulus glass cloth are laid in the order of (0°, 90°) G3 layer and (±45°) G1 layer, and are laid at least once.

6. The composite material clamp according to claim 5, characterized in that, The skeleton layer (2) includes longitudinal ribs (21) and multiple arc-shaped ribs (22); The longitudinal rib (21) extends along the axial direction of the base layer (1), and its two ends extend to the flange (12); Along the length of the longitudinal rib (21), a plurality of the arc-shaped ribs (22) are distributed in parallel and are all fixed to the longitudinal rib (21).

7. The composite material clamp according to claim 6, characterized in that, Biaxial carbon fiber cloth is filled between both ends of the longitudinal rib (21) and the two flanges (12); The space between the arc-shaped rib (22) and the surface of the base layer (1) is filled with unidirectional carbon fiber cloth.

8. The composite material clamp according to claim 6, characterized in that, The reinforcing layer (3) is provided with a reserved groove (31), which is adapted to the skeleton layer (2); In the reinforcing layer (3), the biaxial high modulus glass cloth and the carbon fiber biaxial fabric are laid in the order of (0°, 90°)G, (±45°)G, (0°, 90°)C, and are laid at least once.

9. The composite material clamp according to any one of claims 1 to 8, characterized in that, The arc-shaped shell is provided with two sets of mounting holes (5) symmetrically distributed about its axis. In each set, multiple mounting holes (5) are distributed at intervals along the axis of the arc-shaped shell and all penetrate the base layer (1), the skeleton layer (2) and the reinforcing layer (3). The base layer (1), the skeleton layer (2), and the reinforcing layer (3) are fixedly connected by bolts passing through the mounting holes (5).

10. A method for manufacturing a composite material fixture, characterized in that, The steps for manufacturing the composite material fixture include: Prepare the mold: Install a sealing strip on the outer edge of the upper surface of the mold, install a spiral air extraction pipe on the upper surface of the mold inside the sealing strip, and set an air extraction port at one end of the spiral air extraction pipe. Then install a vacuum bag on the upper surface of the mold, and the vacuum bag covers the area surrounded by the sealing strip. At the same time, apply a release agent to the upper surface of the mold inside the sealing strip. Material laying: The biaxial high modulus glass cloth is laid in the order of (0°,90°)G3 layer and (±45°)G1 layer, and the cycle is repeated every four layers. Then, the skeleton layer is placed, and the biaxial high modulus glass cloth, uniaxial high modulus glass cloth, biaxial carbon fiber fabric and uniaxial carbon fiber fabric are laid. Biaxial carbon fiber cloth is laid on the end face of the longitudinal rib (21). The biaxial carbon fiber cloth is laid in the order of (0°,90°)G, (±45°)G, (0°,90°)C. Uniaxial carbon fiber cloth is laid at the contact position between the arc rib (22) and the upper end face of the base layer (1). The uniaxial carbon fiber cloth is laid in the order of 0°G, 0°c. Then, the biaxial high modulus glass cloth and the biaxial carbon fiber fabric are laid in the order of (0°,90°)G, (±45°)G, (0°,90°)C, and the cycle is repeated every three layers. Resin injection: Vacuuming is performed between the vacuum bag and the mold through the vacuum port and the spiral vacuum tube using a vacuuming device. After vacuuming is completed, resin is injected. The injection environment is room temperature, and the operation time is ≥120min. Demolding and finishing: After resin injection and cooling, the finished product is taken out and a sealing ring (4) is embedded in the sealing groove (11) of the finished product. An installation hole (5) is opened on the finished product and a bolt sleeve (6) is embedded in the installation hole (5).

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