Flexible loading carbon fiber flat actuator

Abstract

This invention discloses a flexible-loading carbon fiber flat actuator, which is generally flat and rectangular, comprising a metal inner liner and a carbon fiber wound armored protective layer. The metal inner liner is used to fill hydraulic oil and pressurize it to generate uniform deformation in the thickness direction to output pressure load. It has upper and lower cover plates on its top and bottom surfaces, with embedded parts distributed on the outer surfaces of the upper and lower cover plates. All four sides are end caps, with the upper and lower edges of the end caps smoothly connected to the upper and lower cover plates via reinforcing ribs. Oil inlet and outlet ports are located on the outer surfaces of the end caps. The upper and lower cover plates are of equal thickness, thicker than the end caps but thinner than the reinforcing ribs. The end caps have a semi-elliptical cross-section when not under load and tend to be a semi-circular cross-section when under load. The carbon fiber wound armored protective layer, composed of several layers of carbon fiber and epoxy resin, is used to wrap and cover the metal inner liner to bear the load and protect it. This actuator can uniformly apply ultra-high pressure loads to large structures within a relatively small height space.

Description

Technical Field

[0001] This invention relates to pressure load loading, and more specifically to a flexible-loaded carbon fiber flat actuator. Background Technology

[0002] Some experiments involve applying pressure loads. For example, deep rock masses are characterized by high ground stress, high ground temperature, and high karst water pressure. As the underground depth increases, the high stress field within the deep rock mass accumulates, making deep geotechnical engineering extremely difficult. Therefore, experimental research is necessary. To simulate the deep multi-field coupled environment and engineering disturbance conditions, and to accurately observe and control the evolution of the discontinuous structure inside the rock mass and the nonlinear behavior outside, many geotechnical engineering disturbance simulation facilities have been developed for experimental research. One very important measure is to apply pressure loads to the samples.

[0003] However, in the field of geotechnical engineering, the general rule is to apply lower pressure loads to large structures and higher pressure loads to small structures. Current simulation facilities generally use rigid loading methods. If ultra-high pressure is to be applied to large structures, the reaction frame structure is huge and will occupy a lot of space, making it impossible to install and construct in a narrow space. For example, in some geotechnical engineering disturbance simulation facilities, the main chamber has a limited volume. After placing the cubic rock sample, there is only a flat space left around the rock sample, and existing actuators cannot be installed. Summary of the Invention

[0004] The purpose of this invention is to provide a flexible-loaded carbon fiber flat actuator that can uniformly apply ultra-high pressure loads to large-sized structures within a relatively small height space.

[0005] The technical solution adopted in this invention is:

[0006] A flexible-loading carbon fiber flat actuator is used to uniformly apply ultra-high pressure loads to large structures within a small height space. The actuator is a flat rectangle, comprising a metal inner liner and a carbon fiber wound armored protective layer. The metal inner liner is filled with hydraulic oil and pressurized to produce uniform deformation in the thickness direction to output the pressure load. It has upper and lower cover plates on its top and bottom surfaces, respectively. Embedded parts are distributed on the outer surfaces of the upper and lower cover plates. All four sides are end caps, and the upper and lower edges of the end caps are connected to the upper cover by reinforcing ribs. The upper and lower cover plates are smoothly connected, and the oil inlet and outlet ports are located on the outer side of the head. The upper and lower cover plates are of equal thickness, thicker than the head and thinner than the reinforcing rib plate. The head has a semi-elliptical cross section when not under stress and tends to be a semi-circular cross section when under stress. The outer side of the reinforcing rib plate has an interface for installing carbon fiber winding fixtures. The embedded part is inverted conical. The carbon fiber winding armor protective layer is used to wrap and cover the metal liner to bear the load and protect the metal liner. It is composed of several layers of carbon fiber and epoxy resin. It is tightened by the embedded part and the oil inlet and outlet ports are exposed.

[0007] Preferably, the metal inner liner is made of austenitic stainless steel.

[0008] Preferably, the carbon fiber used in the carbon fiber wound armor protective layer is of grade TZ700 or higher, and the epoxy resin is a low-viscosity two-component high-temperature resistant epoxy resin system.

[0009] Preferably, the method for determining the size of the end cap is as follows: first, based on the principle that the shape of the end cap tends to be hemispherical when it is deformed, as well as the size of the actuator and the thickness of the carbon fiber wound armor protective layer, the outer contour size of the end cap is obtained; then, based on the strength requirement that the end cap can withstand the tension of the carbon fiber wound armor protective layer and a certain burst pressure, the minimum wall thickness of the end cap is calculated, and the feasibility of the end cap processing technology is considered to determine the thickness of the end cap.

[0010] Preferably, in the metal inner liner, the upper cover plate, lower cover plate, embedded parts, end caps, reinforcing ribs and oil inlet / outlet ports are welded into a whole, and stress relief treatment is performed after welding.

[0011] Preferably, the construction method of the carbon fiber wound armor protective layer is as follows: First, pressurized gas is injected into the metal inner liner through the oil inlet and outlet and sealed to prevent the end cap from being deformed by the external force of the fiber during the subsequent carbon fiber winding and curing process. Then, the carbon fiber winding fixture is installed using the interface on the outer side of the reinforcing rib plate to lift the metal inner liner to a suitable angle. Then, the carbon fiber is wound at the designed angle and number of layers. During the winding process, the carbon fiber is tightened by the embedded parts. After the winding is completed, the flat surfaces on the upper and lower cover plates are polished to remove excess epoxy resin. Then, carbon fiber cloth is laid on the flat surfaces on the upper and lower cover plates and cured. Finally, the gas inside the metal inner liner is released.

[0012] Preferably, the oil inlet and outlet ports are externally connected using fine-pitch threaded holes and sealed by the tapered surface at the rear end of the fine-pitch threaded holes.

[0013] Preferably, the outer side of the upper part of the metal inner liner end cap is provided with a lifting device, which exposes the carbon fiber wound armor protective layer and is not on the same end cap as the oil inlet and outlet.

[0014] Preferably, the edges of the reinforcing ribs and embedded parts are rounded.

[0015] Preferably, two oil inlet and outlet ports are distributed on a pair of end caps.

[0016] The beneficial effects of the present invention are:

[0017] To minimize vertical space requirements, the actuator is designed with a flat overall shape and a flexible loading method. During operation, hydraulic oil is filled into the metal liner through the inlet and outlet ports. A booster is then used to slowly pressurize the liner through the inlet and outlet ports. Under internal pressure, the metal liner deforms in the thickness direction to output the pressure load, eliminating the need for a reaction frame. To ensure that the deformation direction is in the thickness direction and that the entire load output plane remains undeformed, the actuator features upper and lower cover plates of equal thickness, thicker than the end cap but thinner than the reinforcing ribs. The upper and lower edges of the end cap are smoothly connected to the upper and lower cover plates via reinforcing ribs, respectively. This effectively connects the end cap and the upper (and lower) cover plates of different thicknesses while reducing stress concentration at the connection point during pressurization. Therefore, material deformation is concentrated in the thinnest end cap area (i.e., the edge area), and the upper and lower cover plates move as a whole under internal pressure. To prevent arching deformation and ensure the weaker parts of the metal liner can withstand a certain amount of internal pressure, the actuator is designed with a semi-elliptical cross-section when unloaded and a semi-circular cross-section when loaded. The semi-circular cross-section under load is the optimal stress state, reducing stress concentration. This allows the head to withstand internal pressure while achieving a large deformation. To prevent damage to the metal liner from excessive internal pressure, the actuator is equipped with a carbon fiber wound armor protective layer that wraps around the metal liner. This layer bears the load and protects the metal liner, which only serves as a hydraulic oil container. To ensure the carbon fiber wound armor protective layer functions effectively, the actuator incorporates inverted conical embedded parts. For large-sized metal liners, the embedded parts distributed on the upper and lower cover plates create numerous tension points for the carbon fiber wound armor protective layer, reducing the loss of carbon fiber performance. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of a flexibly loaded carbon fiber flat actuator in an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A magnified view of the central area.

[0020] Figure 3 This is a perspective view of the metal inner liner in an embodiment of the present invention.

[0021] Figure 4 This is a front view of the metal inner liner in an embodiment of the present invention.

[0022] Figure 5 This is a top view of a carbon fiber winding fixture installed on a metal inner liner in an embodiment of the present invention.

[0023] Figure 6 This is a cross-sectional schematic diagram of the end cap before and after deformation in an embodiment of the present invention.

[0024] Figure 7 This is a two-dimensional coordinate diagram of the end cap before deformation in an embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the oil inlet and outlet ports in an embodiment of the present invention.

[0026] Figure 9 This is a perspective view of the metal liner in another embodiment of the present invention.

[0027] In the figure: 1-Metal inner liner; 11-Inlet / outlet oil port; 12-End cap; 13-Reinforcing rib plate; 131-Interface; 14-Embedded part; 15-Upper cover plate; 16-Lower cover plate; 17-Lifting component; 2-Carbon fiber wound armor protective layer; 3-Carbon fiber wound tooling. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0031] In the description of this application, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0033] Example 1

[0034] This application discloses a flexible-loaded carbon fiber flat actuator for uniformly applying ultra-high pressure loads to large-sized structures within a relatively small height space, such as... Figure 1 and Figure 2 As shown, it is a flat rectangle, comprising a metal inner liner 1 and a carbon fiber wound armor protective layer 2; wherein:

[0035] The metal inner liner 1 is used to fill the interior with hydraulic oil and pressurize it, thereby producing uniform deformation in the thickness direction to output pressure loads, such as... Figures 1 to 5 As shown, the upper and lower surfaces of the metal inner liner 1 are respectively covered by an upper cover plate 15 and a lower cover plate 16. Embedded parts 14 are distributed on the outer surfaces of the upper cover plate 15 and the lower cover plate 16. All four sides are covered by end caps 12. The upper and lower edges of the end caps 12 are smoothly connected to the upper cover plate 15 and the lower cover plate 16 via reinforcing ribs 13. Oil inlet and outlet ports 11 are located on the outer surfaces of the end caps 12. Figure 2 As shown, the upper cover plate 15 and the lower cover plate 16 are of equal thickness and are thicker than the end cap 12 but thinner than the reinforcing rib plate 13, as... Figure 6 As shown, the end cap 12 has a semi-elliptical cross section when not under stress, and tends to be a semi-circular cross section when under stress, as... Figure 3 and Figure 5 As shown, the outer side of the reinforcing rib plate 13 is provided with an interface 131 for installing the carbon fiber winding fixture 3, such as... Figure 2 As shown, the embedded part 14 is inverted cone shape;

[0036] The carbon fiber wound armor protective layer 2 is used to wrap and cover the metal inner liner 1, thereby bearing the load and protecting the metal inner liner 1, such as... Figure 1 and Figure 2 As shown, it is composed of several layers of carbon fiber and epoxy resin, and is tightened by the embedded part 14 to expose the oil inlet and outlet ports 11.

[0037] In the above scheme, in order to uniformly apply ultra-high pressure loads to large-sized structures within a relatively small height space, the key design points of this actuator are as follows:

[0038] 1) In order to occupy less height space, the actuator is designed to be flat and adopts a flexible loading method. When in use, hydraulic oil can be filled into the metal inner tank 1 through the oil inlet and outlet 11, and then the pressurization equipment can be used to slowly pressurize the metal inner tank 1 through the oil inlet and outlet 11. After being subjected to internal pressure, the metal inner tank 1 deforms in the thickness direction to output pressure load, without the need to set up a reaction frame.

[0039] 2) To ensure that the deformation direction is in the thickness direction and that the entire load output plane does not deform, the actuator is designed with the upper cover plate 15 and the lower cover plate 16 having the same thickness, thicker than the end cap 12 and thinner than the reinforcing rib plate 13. The upper and lower edges of the end cap 12 are smoothly connected to the upper cover plate 15 and the lower cover plate 16 respectively through the reinforcing rib plate 13. In this way, the reinforcing rib plate 13 can effectively connect the end cap 12 and the upper cover plate 15 (lower cover plate 16) with different thicknesses, and also reduce the stress concentration during the pressurization process at the connection. Therefore, the material deformation will be concentrated in the thinnest end cap 12 area (i.e., the edge area). The upper cover plate 15 and the lower cover plate 16 move as a whole under the action of internal pressure without arching deformation.

[0040] 3) In order to enable the weak part of the metal inner liner 1 to withstand a certain internal pressure, the actuator is designed so that the end cap 12 is a semi-elliptical cross section when not under stress and tends to be a semi-circular cross section when under stress. The end cap 12 tends to be a semi-circular cross section when under stress, which is the optimal stress state and can reduce stress concentration. In this way, the end cap 12 can withstand internal pressure while achieving a large amount of deformation.

[0041] 4) In order to prevent the metal inner liner 1 from being damaged by the ultra-high internal pressure, the actuator is equipped with a carbon fiber wound armor protective layer 2 to wrap around the metal inner liner 1. The carbon fiber wound armor protective layer 2 can bear the load and protect the metal inner liner 1. The metal inner liner 1 only serves as a container for hydraulic oil.

[0042] 5) In order to make full use of the carbon fiber wound armor protective layer 2, the actuator is equipped with an inverted conical embedded part 14. For the large-sized metal inner liner 1, the embedded parts 14 distributed on the upper cover plate 15 and the lower cover plate 16 can form many tie points for the carbon fiber wound armor protective layer 2, reducing the loss of carbon fiber performance coefficient.

[0043] Regarding the selection of materials, in this embodiment, preferably: the metal inner liner 1 is made of austenitic stainless steel. Austenitic stainless steel has the advantages of good mechanical properties, high elongation, toughness and corrosion resistance, so that the entire metal inner liner 1 meets the requirements of high temperature resistance and deformation. The carbon fiber wound armor protective layer 2 uses carbon fiber of TZ700 grade or above and epoxy resin of low viscosity two-component high temperature resistant epoxy resin system. The epoxy resin is selected with the characteristics of long working time, high glass transition temperature and rapid gelation in the range of 170°C - 220°C. Under appropriate process conditions, the glass transition temperature Tg ≥ 250°C can meet the temperature requirements of the actuator's operating environment. The thickness of the carbon fiber is not limited, but it should meet the requirements of appearance size and pressure resistance when in contact with rock loading.

[0044] In this embodiment, the actuator dimensions are required to be: length × width × thickness 2000mm × 2000mm × 150mm, the maximum internal pressure of the actuator is 150Mpa, the maximum hydraulic oil temperature is 250℃, and the actuator stroke in the thickness direction is more than 12mm.

[0045] Regarding the method for determining the dimensions of the end cap 12, in this embodiment, preferably: first, based on the principle that the shape of the end cap 12 tends to be hemispherical when deformed, and considering the dimensions of the actuator and the thickness of the carbon fiber wound armor protective layer 2, the outer contour dimensions of the end cap 12 are obtained. Then, based on the strength requirement that the end cap 12 can withstand the tension of the carbon fiber wound armor protective layer 2 and a certain burst pressure, the minimum wall thickness of the end cap 12 is calculated. Finally, considering the feasibility of the processing technology of the end cap 12, the thickness of the end cap 12 is determined. Specifically, as follows:

[0046] like Figure 7 As shown, assume the equation of the ellipsoid of head 12 is: At the angle Below, the coordinate values ​​in the X and Y directions are as follows:

[0047]

[0048]

[0049] When subjected to internal pressure P, the force F generated by internal pressure P is:

[0050]

[0051] In the formula: t is the thickness of the end cap 12. For stress,

[0052] When a=b, the end cap 12 is hemispherical. When a > b, , ;therefore That is, when the material deforms, the shape of the end cap 12 tends to a more stable stress state. The shape of the end cap 12 has changed, tending towards a hemispherical shape;

[0053] Based on the above conclusions, the size requirements of the actuator, and the thickness requirements of the carbon fiber wound armor protective layer 2, the end cap 12 is calculated as follows:

[0054] The actuator requires a thickness of 150mm; the actuator's working pressure is 150MPa, with a safety factor of 1.5 (i.e., a breaking pressure of 225MPa); the carbon fiber stacked on the upper and lower planes is approximately 2.3 times the thickness of a single layer, using T700 grade fiber. Preliminary calculations show that the thickness of a single layer of T700 grade fiber is 6.45mm, meaning the outer diameter of the metal inner liner 1 should be: 150 - 6.45 * 2.3 * 2 = 120.3mm;

[0055] The end cap 12 is initially elliptical, and after pressurization, it deforms into a circle (increasing in thickness by 12mm). At this point, the actuator's thickness is 150 + 12 = 162mm, and its radius is R = 81mm. Therefore, the minor axis before deformation is b = 150 / 2 = 75mm. The major axis of the ellipse is...

[0056]

[0057] Therefore, the outer diameter of the major axis of the inner liner is 84.42 - 6.45 * 2.3 = 69.6 mm, and the outer diameter of the minor axis is 69.6 - 6.45 = 63.15 mm.

[0058] In the actuator design, although the inner liner does not bear load and only serves a sealing function, the carbon fiber has a certain degree of tension during fiber winding. The inner liner should have sufficient strength to withstand the tension of the carbon fiber wound armor protective layer 2 and to withstand a certain burst pressure. The burst pressure is selected for calculation:

[0059]

[0060] In the formula: The burst pressure is set at 4 MPa. The inner diameter of the metal liner is 1. The guaranteed tensile strength of the material is taken as 515 MPa; The welding coefficient is 0.8, and the metal inner liner 1 is a seamless structure.

[0061] Calculations show that at an inner liner burst pressure of 4 MPa, the minimum wall thickness of end cap 12 is [value missing]. Considering the feasibility of the inner liner manufacturing process, the design wall thickness of the inner liner is taken as: At this time, the upper cover plate 15 and the lower cover plate 16 can be made of 4.5mm thick steel plates.

[0062] Regarding the fabrication of the metal inner liner 1, in this embodiment, preferably, the upper cover plate 15, the lower cover plate 16, the embedded part 14, the end cap 12, the reinforcing rib plate 13 and the oil inlet / outlet 11 are welded into a whole in the metal inner liner 1, and stress relief treatment is performed after welding.

[0063] Regarding the construction method of the carbon fiber wound armor protective layer 2, in this embodiment, preferably: first, a certain pressure gas (approximately 0.4 MPa) is injected into the metal inner liner 1 through the oil inlet / outlet 11 and sealed to prevent the end cap 12 from being deformed by external fiber force during the subsequent carbon fiber winding and curing process. Then, the carbon fiber winding fixture 3 is installed using the interface 131 on the outer side of the reinforcing rib plate 13 (see...). Figure 6 This process lifts the metal inner liner 1 to a suitable angle, and then the designed angle and number of layers of carbon fiber are wound around it. During the winding process, the carbon fiber is tightened by the embedded part 14. After the winding is completed, the flat surfaces on the upper cover plate 15 and the lower cover plate 16 are polished to remove excess epoxy resin. Then, carbon fiber cloth is laid on the flat surfaces on the upper cover plate 15 and the lower cover plate 16 and cured. Finally, the gas inside the metal inner liner 1 is released. This method can ensure that the flatness of the upper and lower surfaces of the actuator meets the index requirements.

[0064] Regarding the design of the oil inlet / outlet 11, in this embodiment, preferably: as follows: Figure 8 As shown, the oil inlet / outlet 11 is externally connected using a fine-pitch threaded hole and sealed by the conical surface at the rear end of the fine-pitch threaded hole. The conical surface seal is achieved by generating high contact stress between the metal surfaces through the small plastic deformation between the sealing surfaces to fill the small gap, thereby providing a reliable sealing effect. By setting the sealing structure at the rear end of the thread, the internal pressure on the thread is effectively reduced, and the reliability of the thread connection strength is also improved.

[0065] In this embodiment, preferably, the edges of the reinforcing rib 13 and the embedded part 14 are rounded. The rounded edges of the embedded part 14 can prevent sharp edges from scratching the carbon fiber, and the rounded edges of the reinforcing rib 13 can prevent stress concentration.

[0066] In this embodiment, preferably: Figure 3 As shown, two oil inlet and outlet ports 11 are distributed on a pair of end caps 12, which can be pressurized or depressurized simultaneously.

[0067] Example 2

[0068] This embodiment discloses another flexible-loaded carbon fiber flat actuator, which, based on Embodiment 1, adds a lifting component 17, such as... Figure 9 As shown: The outer side of the upper end cap 12 of the metal inner liner 1 is provided with a lifting component 17. The lifting component 17 exposes the carbon fiber wound armor protective layer 2 and is not on the same end cap 12 as the oil inlet / outlet 11. The actuator has a large length and width dimension, and it needs to be handled during processing and testing. Adding the lifting component 17 can meet the lifting requirements of the actuator under full oil conditions.

[0069] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A flexible-loaded carbon fiber flat actuator, characterized in that: Designed to uniformly apply ultra-high pressure loads to large structures within a relatively small height space, the overall structure is a flat rectangle, comprising a metal inner liner and a carbon fiber wound armor protective layer. The metal inner liner is filled with hydraulic oil and pressurized to produce uniform deformation in the thickness direction to output pressure loads. It has upper and lower cover plates on its top and bottom surfaces, with embedded parts distributed on the outer sides of the upper and lower cover plates. All four sides are end caps, with the upper and lower edges of the end caps smoothly connected to the upper and lower cover plates via reinforcing ribs. The oil inlet and outlet are located on the outer side of the end caps. The upper and lower cover plates are of equal thickness, thicker than the end caps but thinner than the reinforcing ribs. The end caps have a semi-elliptical cross section when not under load and tend to be a semi-circular cross section when under load. The outer side of the reinforcing ribs has an interface for installing carbon fiber wound fixtures, and the embedded parts are inverted conical in shape. The carbon fiber wound armor protective layer is used to wrap and cover the metal inner liner to bear the load and protect the metal inner liner. It is composed of several layers of carbon fiber and epoxy resin, and is tightened by the embedded parts, exposing the oil inlet and outlet.

2. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that: The metal inner liner is made of austenitic stainless steel.

3. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that: The carbon fiber used in the carbon fiber wound armor protective layer is of grade TZ700 or higher, and the epoxy resin is a low-viscosity two-component high-temperature resistant epoxy resin system.

4. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that, The method for determining the size of the end cap is as follows: First, based on the principle that the shape of the end cap tends to be hemispherical when it is deformed, as well as the size of the actuator and the thickness of the carbon fiber wound armor protective layer, the outer contour size of the end cap is obtained. Then, based on the strength requirements that the end cap can withstand the tension of the carbon fiber wound armor protective layer and a certain burst pressure, the minimum wall thickness of the end cap is calculated. Finally, considering the feasibility of the end cap processing technology, the thickness of the end cap is determined.

5. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that: In the metal liner, the upper cover plate, lower cover plate, embedded parts, end caps, reinforcing ribs, and oil inlet / outlet ports are welded together as a whole, and stress relief treatment is performed after welding.

6. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that, The construction method of carbon fiber wound armor protective layer is as follows: First, pressurize the metal inner liner with a certain amount of gas through the oil inlet and outlet and seal it to prevent the end cap from being deformed by the external force of the fiber during the subsequent carbon fiber winding and curing process. Then, install the carbon fiber winding fixture using the interface on the outer side of the reinforcing rib plate to lift the metal inner liner to a suitable angle. Then, install the designed angle and number of layers of carbon fiber for winding. During the winding process, the carbon fiber is tightened by the embedded parts. After the winding is completed, grind the surface of the upper and lower cover plates to remove excess epoxy resin. Then, lay carbon fiber cloth on the surface of the upper and lower cover plates and cure it. Finally, release the gas in the metal inner liner.

7. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that: The oil inlet and outlet ports are externally connected using fine-pitch threaded holes, and sealed by the tapered surface at the rear end of the fine-pitch threaded holes.

8. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that: The upper part of the metal inner liner has a lifting device on the outer side of the end cap. The lifting device exposes the carbon fiber wrapped armor protective layer and is not on the same end cap as the oil inlet and outlet.

9. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that: The edges of the reinforcing ribs and embedded parts are rounded.

10. The flexible-loaded carbon fiber flat actuator as described in claim 1, characterized in that: Two oil inlet and outlet ports are distributed on a pair of end caps.

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