Three-dimensional braided plate spring for supporting a curved rail of a carding machine and a method for manufacturing the same

Abstract

This invention provides a three-dimensional braided leaf spring for supporting the curved rail of a carding machine and its manufacturing method, relating to the field of three-dimensional braiding technology. The three-dimensional braided leaf spring for supporting the curved rail of a carding machine includes an inner core mold, an outer carbon fiber covering layer, and a bonding layer. The outer carbon fiber covering layer covers the surface of the inner core mold, and the bonding layer fills the interface gap between the inner core mold and the outer carbon fiber covering layer, forming an integrated structure with the inner core mold and the outer carbon fiber covering layer. In this invention, the outer carbon fiber covering layer is made of woven carbon fiber, reducing the overall weight of the leaf spring, lowering the inertia of the curved rail of the carding machine, and improving the accuracy of roller movement. Furthermore, the bonding layer forms an integrated structure, eliminating interlayer defects in traditional laminated structures, significantly improving interlayer shear strength and anti-peeling ability, adapting to the load requirements of the reciprocating vibration of the curved rail of the carding machine, and extending the service life and load-bearing stability of the leaf spring for supporting the curved rail of the carding machine.

Description

Technical Field

[0001] The present invention relates to the technical field of three-dimensional braiding, and particularly relates to a three-dimensional braided leaf spring for supporting the curved rail of a carding machine and a preparation method thereof. Background Art

[0002] The leaf spring for supporting the curved rail of a carding machine is the core supporting component of the roller motion system. Its core function is to provide stable elastic support for the curved rail, accurately adapt to the reciprocating vibration load generated by the high-speed rotation of the roller at more than a thousand revolutions per minute, and at the same time, it needs to meet the three core requirements of light weight, high fatigue resistance, and stiffness adaptability, which directly affects the evenness of fiber carding and the continuous operation stability of the equipment.

[0003] The current mainstream leaf springs for supporting the curved rail in the market are mainly divided into two categories: metal springs and traditional laminated composite material leaf springs. Both have significant performance shortcomings and are difficult to match the efficient and accurate production requirements of modern carding machines: First, the metal spring has a large material density, resulting in a relatively high self-weight, which not only increases the running inertia of the equipment but also affects the starting and stopping response speed and motion accuracy of the roller. Plastic deformation is likely to occur due to fatigue during long-term operation, which may further lead to the offset of the curved rail support; Second, the traditional laminated composite material leaf spring is formed by a two-dimensional laying process, and the interfacial bonding strength between layers is weak. Under the action of the high-frequency reciprocating vibration load of the curved rail, interlayer cracking and peeling failure are likely to occur, and the service life is short; Third, the stiffness characteristics of both types of leaf springs are fixed values and cannot flexibly adapt to the load changes according to the carding working conditions of different fibers such as cotton, hemp, and chemical fibers, which is likely to lead to insufficient running stability of the curved rail and further affect the fabric forming quality. Summary of the Invention

[0004] The present invention provides a three-dimensional braided leaf spring for supporting the curved rail of a carding machine and a preparation method thereof to solve at least one of the technical problems mentioned in the above background art.

[0005] To solve the above technical problems, the present invention discloses a three-dimensional braided leaf spring for supporting the curved rail of a carding machine, including: an inner core mold, an outer carbon fiber coating layer, and a bonding layer. The outer carbon fiber coating layer is coated on the surface of the inner core mold, the bonding layer fills the interfacial gap between the inner core mold and the outer carbon fiber coating layer, and the bonding layer forms an integrated structure with the inner core mold and the outer carbon fiber coating layer.

[0006] Preferably, the inner core mold is a three-dimensional woven hard structure, and the inner core mold is in a "U" shape.

[0007] Preferably, the outer carbon fiber coating layer is a carbon fiber three-dimensional braided layer.

[0008] Preferably, the material of the bonding layer is a thermosetting resin.

[0009] It also includes a method for preparing a three-dimensional braided leaf spring for supporting the curved track of a carding machine, which includes the following steps: Step 1: The core mold blank is processed using three-dimensional weaving technology, and then cured to form the inner core mold. Step 2: Fix the inner core mold to the three-dimensional braiding machine station, use continuous carbon fiber thread as the braiding material, and perform three-dimensional wrapping braiding along the surface of the inner core mold to make the carbon fiber thread evenly interwoven and tightly attached to the inner core mold. After the braiding is completed, an outer carbon fiber wrapping layer is formed. The outer carbon fiber wrapping layer covers the surface of the inner core mold to form the core mold assembly. Step 3: Move the core mold assembly into the resin transfer molding mold, seal it, inject thermosetting resin into the resin transfer molding mold and pressurize and cure it, so that the thermosetting resin fully wets the inner core mold and the outer carbon fiber coating layer, and fills the interface gap between the inner core mold and the outer carbon fiber coating layer to form a bonding layer. The bonding layer, the inner core mold and the outer carbon fiber coating layer are co-cured to form an integrated structure. After demolding, the leaf spring product is obtained.

[0010] Preferably, in step 1, the curing temperature is 120-150℃ and the holding time is 2-4 hours.

[0011] Preferably, in step 1, the inner core mold formed after curing is placed in a plasma treatment device, and the surface of the inner core mold is bombarded with plasma.

[0012] Preferably, plasma bombardment of the inner core mold surface includes: Obtain the actual surface roughness of the area to be processed on the inner core mold surface; Calculate the deviation between the actual roughness and the preset roughness; The target bombardment duration is determined based on the deviation value; Plasma bombardment is performed on the surface of the inner core mold to be processed based on the target bombardment duration.

[0013] Preferably, determining the target bombardment duration based on the deviation value includes: Set the baseline value for bombardment duration; If the deviation between the actual roughness and the preset roughness is positive, that is, the actual roughness is greater than the preset roughness, the bombardment time reference value is adjusted by decreasing according to the ratio of the deviation value to the reference deviation. If the deviation between the actual roughness and the preset roughness is not positive, that is, the actual roughness is less than or equal to the preset roughness, the bombardment duration reference value is adjusted incrementally according to the ratio of the absolute value of the deviation to the reference deviation.

[0014] Preferably, the target bombardment duration is not less than a preset minimum threshold and does not exceed a preset maximum threshold.

[0015] The technical solution of this invention has the following advantages: This invention provides a three-dimensional braided leaf spring for supporting the curved rail of a carding machine and its preparation method, relating to the field of three-dimensional braiding technology. The three-dimensional braided leaf spring for supporting the curved rail of a carding machine includes an inner core mold, an outer carbon fiber covering layer, and a bonding layer. The outer carbon fiber covering layer covers the surface of the inner core mold, and the bonding layer fills the interface gap between the inner core mold and the outer carbon fiber covering layer, forming an integrated structure with the inner core mold and the outer carbon fiber covering layer. In this invention, the outer carbon fiber covering layer is made of woven carbon fiber, which reduces the overall weight of the leaf spring, reduces the inertia of the curved rail of the carding machine, and improves the accuracy of the roller movement. Furthermore, the bonding layer can fill the interface gap between the inner core mold and the outer carbon fiber covering layer, forming an integrated structure, eliminating the interlayer defects of traditional laminated structures, significantly improving the interlayer shear strength and anti-peeling ability, avoiding cracking and peeling failure during use, adapting to the load requirements of the reciprocating vibration of the curved rail of the carding machine, and significantly extending the service life and load-bearing stability of the leaf spring for supporting the curved rail of the carding machine.

[0016] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the means particularly pointed out in the written description and the accompanying drawings.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the finished leaf spring structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the finished leaf spring of the present invention.

[0019] In the diagram: 1. Inner core mold; 2. Outer carbon fiber coating layer; 3. Bonding layer; 4. Finished leaf spring. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only, and do not particularly refer to the order or sequence, nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between various embodiments may be combined with each other, but it must be based on what can be achieved by those of ordinary skill in the art. When the combination of technical solutions results in contradictions or cannot be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] An embodiment of the present invention provides a three-dimensional woven leaf spring for supporting a curved rail of a carding machine, as Figure 1 , Figure 2 shown, including: an inner core mold 1, an outer carbon fiber coating layer 2, and a bonding layer 3. The outer carbon fiber coating layer 2 is coated on the surface of the inner core mold 1. The bonding layer 3 fills the interface gap between the inner core mold 1 and the outer carbon fiber coating layer 2, and the bonding layer 3 forms an integral structure with the inner core mold 1 and the outer carbon fiber coating layer 2; The inner core mold 1 is a three-dimensional woven rigid structure, and the inner core mold 1 is in a "U" shape; The outer carbon fiber coating layer 2 is a carbon fiber three-dimensional woven layer; The material of the bonding layer 3 is a thermosetting resin, and the thermosetting resin is an epoxy resin or a phenolic resin.

[0023] The working principle and beneficial effects of the above technical solution are as follows: First, a "J"-shaped inner core mold 1 with both support stiffness and deformation ability is prepared by three-dimensional weaving technology, thereby providing the core mechanical support for the leaf spring and adapting to the support installation angle of the curved rail of the carding machine. Then, using three-dimensional braiding technology, continuous carbon fibers are arranged in a directional manner along the force direction of the leaf spring and tightly wrapped and braided on the surface of the inner core mold 1. T700 carbon fiber wire can be used as the braiding raw material to form an outer carbon fiber coating layer 2 that closely adheres to the inner core mold 1, and the force transmission path is optimized through the outer carbon fiber coating layer 2. Next, a thermosetting resin is injected into the interface gap between the inner core mold 1 and the outer carbon fiber coating layer 2 through the RTM (resin transfer molding) process. The resin fully infiltrates the surfaces of both and co-cures to form an integrated composite structure without delamination defects. When the curved rail of the carding machine is supported, the "J"-shaped inner core mold 1 and the outer carbon fiber coating layer 2 cooperate in elastic deformation to absorb the vibration energy generated by the rotation of the roller, provide stable support for the curved rail, and ensure the uniformity of yarn carding. The energy absorption efficiency is significantly improved compared with the leaf spring of conventional materials. In the present invention, the outer carbon fiber coating layer 2 is woven from continuous carbon fibers with high strength and low density. Combined with the lightweight design of the three-dimensional woven inner core mold 1, the overall weight is significantly reduced compared with the traditional metal leaf spring or multi-leaf spring combination structure, effectively reducing the running inertia of the curved rail of the carding machine and improving the motion accuracy of the roller. At the same time, the carbon fibers are arranged in a directional manner along the core force direction of the curved rail support of the carding machine, making the leaf spring have both excellent bearing stiffness and flexible elastic deformation ability, and can accurately adapt to the reciprocating vibration load under the high-speed operation of more than a thousand revolutions per minute of the curved rail, ensuring uniform force and controllable deformation during the support process, and stably matching the load fluctuation requirements of different fiber carding conditions. The three-dimensional integral braiding method eliminates the hidden danger of interlayer slip of the traditional laminated structure. The thermosetting resin bonding layer 3 fully fills the interface gap and realizes co-curing, so that the bonding layer 3 and the inner core mold 1 and the outer carbon fiber coating layer 2 form an integrated structure, greatly improving the interlayer shear strength and anti-peeling ability, avoiding cracking and peeling failure during use, and adapting to the 5-10 MPa reciprocating vibration load brought by the roller of the curved rail of the carding machine at more than a thousand revolutions per minute, and significantly extending the service life and bearing stability of the leaf spring for supporting the curved rail of the carding machine.

[0024] The embodiment of the present invention also provides a preparation method for a three-dimensional braided leaf spring for supporting the curved rail of a carding machine, which is used to prepare a three-dimensional braided leaf spring for supporting the curved rail of a carding machine, and includes the following steps: Step 1: Process a core mold blank by three-dimensional weaving technology, and perform a curing treatment on the core mold blank to form an inner core mold 1. The temperature of the curing treatment is 120-150 °C, and the heat preservation time is 2-4 hours; Step 2: Fix the inner core mold 1 at the three-dimensional braiding machine station, use continuous carbon fiber thread as the braiding material, and perform three-dimensional wrapping braiding along the surface of the inner core mold 1 so that the carbon fiber thread is evenly interwoven and tightly attached to the inner core mold 1. After the braiding is completed, an outer carbon fiber wrapping layer 2 is formed. The outer carbon fiber wrapping layer 2 wraps around the surface of the inner core mold 1 to form a core mold assembly. Step 3: Move the core mold assembly into the resin transfer molding mold, seal it, inject thermosetting resin into the resin transfer molding mold and pressurize and cure it, so that the thermosetting resin fully wets the inner core mold 1 and the outer carbon fiber covering layer 2, and fills the interface gap between the inner core mold 1 and the outer carbon fiber covering layer 2 to form a bonding layer 3. The bonding layer 3, the inner core mold 1 and the outer carbon fiber covering layer 2 are co-cured to form an integrated structure. After demolding, the leaf spring finished product 4 is obtained.

[0025] The working principle and beneficial effects of the above technical solution are as follows: When preparing the leaf spring, the core mold blank is first processed using three-dimensional weaving technology. The core mold blank is then cured at a temperature controlled at 120-150℃ for 2-4 hours to form an inner core mold 1 with basic support stiffness. Next, the inner core mold 1 is fixed at the three-dimensional weaving machine station. Using T700 grade 12K carbon fiber yarn as the weaving material, three-dimensional overall weaving is performed along the surface of the inner core mold 1, ensuring that the T700 grade 12K carbon fiber yarn is evenly interwoven and tightly adhered to the inner core mold 1, ensuring no gap between the outer carbon fiber covering layer 2 and the inner core mold 1, thus producing the core mold assembly. The core mold assembly is then transferred into a resin transfer molding mold. After closing the mold, thermosetting resin is injected. The thermosetting resin can be epoxy resin. A pressure of 0.3MPa is applied through a pressure device, while the mold temperature is raised to 130℃ and cured for 3 hours until the thermosetting resin completely impregnates the carbon fiber. After the fiber and core mold are cured and formed, the mold is opened and the product is taken out to obtain the finished leaf spring 4. In the above scheme, the tight arrangement of the outer carbon fiber and the wetting effect of the bonding layer 3 improve the bonding effect between the bonding layer 3 and the inner core mold 1 and the outer carbon fiber covering layer 2, avoiding the defects of interlayer gaps in traditional molding processes, greatly improving the consistency and pass rate of the finished leaf spring 4. The interlayer bonding strength of the finished leaf spring 4 is improved, which can effectively transfer and disperse the reciprocating vibration stress of the carding machine curved track, avoid failure problems such as interlayer slippage and cracking, and ensure the load-bearing durability and service life of the leaf spring. The preparation process adopts a three-dimensional weaving and resin transfer molding integrated molding process. The resin transfer molding integrated molding process can realize mass production. Combined with the automated operation of three-dimensional weaving, compared with the traditional multi-step assembly process, it greatly improves production efficiency, reduces process loss, increases raw material utilization, and reduces industrial production costs.

[0026] Further, in step 1, the inner core mold 1 formed after curing is placed in a plasma treatment device, and the surface of the inner core mold 1 is bombarded with plasma. Plasma bombardment of the inner core mold 1 surface includes: Obtain the actual surface roughness of the area to be processed on the surface of the inner core mold 1; Calculate the deviation between the actual roughness and the preset roughness; The target bombardment duration is determined based on the deviation value; Plasma bombardment is performed on the surface of the inner core mold 1 at the location to be processed based on the target bombardment duration.

[0027] The working principle and beneficial effects of the above technical solution are as follows: After placing the inner core mold 1 in the plasma processing equipment, the actual roughness of the area to be processed on the inner core mold 1 is first obtained. Then, the deviation between the actual roughness and the preset roughness is calculated, and the target bombardment time is determined based on the deviation. Then, the plasma processing equipment bombards the area to be processed on the surface of the inner core mold 1 with plasma based on the target bombardment time. During bombardment, the gas supply system of the plasma processing equipment delivers an argon-oxygen mixture at a volume ratio of 3:1. The plasma bombarder is adjusted to the preset power (100-120W) and pressure (0.1-0.3MPa), moves along the planned path to each area to be processed, and starts the plasma emission head according to the determined target bombardment time. After completion, the equipment is turned off. After processing, the actual roughness of the inner core mold 1 approaches the target roughness, where the target roughness is twice the preset roughness. For example, if the target roughness is 0.8μm, the preset roughness is 0.4μm. Through the above scheme, the bombardment time can be precisely matched according to the actual roughness of the surface of different inner core mold 1 locations to be treated. By utilizing the etching and activation effects of plasma, on the one hand, the actual roughness of the inner core mold 1 surface is brought closer to the target roughness, thereby constructing an interface structure suitable for subsequent braiding and covering; on the other hand, the molecular bonds on the surface of the inner core mold 1 are broken, active groups are introduced, and the surface wettability and adhesion are improved. The surface of the inner core mold 1 after bombardment modification forms a stronger interface bond with the outer carbon fiber covering layer 2 and the bonding layer 3, enhancing the chemical adhesion between the inner core mold 1 and the thermosetting resin bonding layer 3, further improving the overall interlaminar shear strength and anti-peeling ability of the leaf spring. Furthermore, by accurately determining the target bombardment time, it is ensured that the inner core molds 1 with different initial roughness can all achieve a uniform target surface state after treatment, avoiding problems such as uneven resin wetting and defects in the bonding layer 3 caused by differences in surface state, and significantly improving the consistency and mechanical performance stability of the finished leaf spring 4.

[0028] Furthermore, determining the target bombardment duration based on the deviation value includes: Set the baseline value for bombardment duration; If the deviation between the actual roughness and the preset roughness is positive, that is, the actual roughness is greater than the preset roughness, the bombardment time reference value is adjusted by decreasing according to the ratio of the deviation value to the reference deviation. If the deviation between the actual roughness and the preset roughness is not positive, that is, the actual roughness is less than or equal to the preset roughness, the bombardment duration reference value is adjusted incrementally according to the ratio of the absolute value of the deviation to the reference deviation. The target bombardment duration shall not be less than the preset minimum threshold and shall not exceed the preset maximum threshold.

[0029] The working principle and beneficial effects of the above technical solution are as follows: First, a bombardment duration reference value is set, which is 45 seconds; When the deviation value is positive, the target bombardment duration is calculated using the following formula (1): (1); in, Target bombardment duration, As a baseline value for bombardment duration, Adjust the duration in units. This is the deviation value. This is the baseline deviation; When the deviation value is non-positive, the target bombardment duration is calculated using the following formula (2): (2); in, Target bombardment duration, As a baseline value for bombardment duration, Adjust the duration in units. This is the deviation value. This is the baseline deviation; Specifically, the baseline bombardment duration is 45 seconds, the unit adjustment duration is 5 seconds, and the baseline deviation is 0.1μm. When the deviation is 0.2μm, the target bombardment duration is calculated using formula (1), and the target bombardment duration is 35 seconds. When the deviation is -0.3μm, the target bombardment duration is calculated using formula (2), and the target bombardment duration is 60 seconds. Furthermore, the target bombardment duration is not less than the preset minimum threshold and does not exceed the preset maximum threshold. The minimum threshold is 30 seconds and the maximum threshold is 60 seconds. By setting the maximum threshold, the upper limit of plasma bombardment duration can be limited, avoiding problems such as excessive etching, micro-cracks, or substrate degradation on the surface of the inner core mold 1 due to prolonged bombardment. This ensures that the three-dimensional woven rigid structure of the inner core mold 1 maintains stable support stiffness and mechanical properties, laying a reliable structural foundation for subsequent carbon fiber coating and integrated molding. In addition, it can avoid ineffective bombardment for too long, reducing equipment energy consumption and production time waste, and lowering the processing cost per unit product. By setting the minimum threshold, it can be ensured that the bombardment duration is not less than the critical value for effective activation, avoiding insufficient activation of the core mold surface and insufficient introduction of active groups due to insufficient processing time. This prevents insufficient interfacial adhesion between the subsequent bonding layer 3 and the surface of the inner core mold 1, avoiding the need for secondary rework due to insufficient activation, and further improving the economy and efficiency of the process. The above scheme can reduce the deviation between the actual roughness and the target roughness of the inner core mold 1, making the actual roughness closer to the target roughness. In the optimal case, the deviation between the actual roughness and the target roughness is ≤0.05μm, which provides a stable foundation for the subsequent braiding and wrapping fit and the uniformity of the resin bonding layer 3, improves the interfacial shear strength, further ensures the stability of the mechanical properties of the finished leaf spring 4, and avoids the problem of large differences in the effect after the inner core mold 1 is treated with different actual roughness by focusing on the target roughness, so that the surface activation effect is uniform and stable, and the product consistency is improved.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A three-dimensional braided leaf spring for supporting the curved track of a carding machine, characterized in that, It includes: An inner core mold (1), an outer carbon fiber coating layer (2), and a bonding layer (3). The outer carbon fiber coating layer (2) is coated on the surface of the inner core mold (1). The bonding layer (3) fills the interface gap between the inner core mold (1) and the outer carbon fiber coating layer (2), and the bonding layer (3) and the inner core mold (1), the outer carbon fiber coating layer (2) form an integrated structure.

2. The three-dimensional braided leaf spring for supporting the curved track of a carding machine according to claim 1, characterized in that, The inner core mold (1) is a three-dimensional woven rigid structure, and the inner core mold (1) is in a "U" shape.

3. A three-dimensional braided leaf spring for supporting the curved track of a carding machine according to claim 1, characterized in that, The outer carbon fiber coating layer (2) is a carbon fiber three-dimensional braided layer.

4. A three-dimensional braided leaf spring for supporting the curved track of a carding machine according to claim 1, characterized in that, The material of the bonding layer (3) is a thermosetting resin.

5. A method for preparing a three-dimensional braided leaf spring for supporting the curved track of a carding machine, used to prepare a three-dimensional braided leaf spring for supporting the curved track of a carding machine as described in any one of claims 1-4, characterized in that, It includes the following steps: Step 1: Process a core mold blank by three-dimensional weaving technology, and perform curing treatment on the core mold blank to form the inner core mold (1); Step 2: Fix the inner core mold (1) on the three-dimensional braiding machine station, use continuous carbon fiber yarn as the braiding raw material, and perform three-dimensional covering braiding along the surface of the inner core mold (1) to make the carbon fiber yarns uniformly interweave and closely adhere to the inner core mold (1). After braiding, an outer carbon fiber coating layer (2) is formed. The outer carbon fiber coating layer (2) is coated on the surface of the inner core mold (1) to form a core mold assembly; Step 3: Move the core mold assembly into a resin transfer molding mold, seal it, inject a thermosetting resin into the resin transfer molding mold and pressurize it for curing, so that the thermosetting resin fully infiltrates the inner core mold (1) and the outer carbon fiber coating layer (2), and at the same time fills the interface gap between the inner core mold (1) and the outer carbon fiber coating layer (2) to form a bonding layer (3). The bonding layer (3) and the inner core mold (1), the outer carbon fiber coating layer (2) are co-cured to form an integrated structure, and the finished leaf spring (4) is obtained after demolding.

6. The method for preparing a three-dimensional braided leaf spring for a carding machine curved track support according to claim 5, characterized in that, In Step 1, the temperature of the curing treatment is 120 - 150 °C, and the heat preservation time is 2 - 4 hours.

7. The method for preparing a three-dimensional braided leaf spring for a carding machine curved track support according to claim 5, characterized in that, In Step 1, place the inner core mold (1) formed after the curing treatment in a plasma treatment device, and perform plasma bombardment on the surface of the inner core mold (1).

8. The method for preparing a three-dimensional braided leaf spring for a carding machine curved track support according to claim 7, characterized in that, Performing plasma bombardment on the surface of the inner core mold (1) includes: Obtain the actual roughness of the position to be treated on the surface of the inner core mold (1); Calculate the deviation value between the actual roughness and the preset roughness; Determine the target bombardment duration according to the deviation value; Perform plasma bombardment on the position to be treated on the surface of the inner core mold (1) based on the target bombardment duration.

9. A method for preparing a three-dimensional braided leaf spring for a carding machine curved track support according to claim 8, characterized in that, Determining the target bombardment duration according to the deviation value includes: Set a reference value for the bombardment duration; If the deviation value between the actual roughness and the preset roughness is positive, that is, the actual roughness is greater than the preset roughness, then decrease and adjust the reference value of the bombardment duration according to the ratio of the deviation value to the reference deviation; If the deviation value between the actual roughness and the preset roughness is non-positive, that is, the actual roughness is less than or equal to the preset roughness, then increase and adjust the reference value of the bombardment duration according to the ratio of the absolute value of the deviation value to the reference deviation.

10. A method for preparing a three-dimensional braided leaf spring for a carding machine curved track support according to claim 9, characterized in that, The target bombardment duration is not less than the preset minimum threshold and does not exceed the preset maximum threshold.

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