298 results about "Pultrusion" patented technology

The invention discloses a composite material barrel shell, a spliced buoy and a floating mat structure, the composite material barrel shell comprises a barrel shell body which is continuously formed by adopting a fiber reinforced material through a pultrusion process, and a mounting plane of a plane structure is formed at the top of the barrel shell body; the two sides, in the width direction of the barrel shell body, of the installation plane protrude to form installation turned-over edges. The spliced buoy comprises a plurality of composite barrel shells and spliced plugs, and barrel shell bodies are linearly arranged in the length direction. Due to the fact that the whole top face of the barrel shell body is the installation plane of the plane structure, assembling connection with an upper structure is facilitated, all the installation planes and the installation turnups can support the upper structure, and the splicing type floating barrel can be conveniently and flexibly spliced to obtain the splicing type floating barrel with the needed length according to actual requirements. And meanwhile, the splicing operation is simple, and the splicing efficiency is high. The floating mat structure can be used as various water platforms and is good in universality, high in structural strength and good in weather resistance.

The invention discloses a multi-source data-driven intelligent optimization method for a composite material pultrusion process. The method comprises the following steps: forming a multi-source process database by collecting process parameters and multi-working-condition simulation data obtained by simulation in real time; constructing a technological process LSTM prediction model based on a long short-term memory network, predicting quality, energy consumption and efficiency parameters of the product, and performing multi-target autonomous optimization to obtain a collaborative optimal solution set of the quality, energy consumption and efficiency of the product; according to the collaborative optimal solution set, a process scheme is generated, and an instruction is formed and issued; and according to the data of the staged multi-source process database, constructing a continuously learned data sample, updating and optimizing the process LSTM prediction model, and updating and optimizing the process decision-making scheme library. Compared with the prior art, the method has the advantages that autonomous decision, accurate control and continuous optimization of pultrusion process parameters are realized, so that the production efficiency is remarkably improved and the energy consumption is reduced on the premise of ensuring stable and reliable product quality.

The invention relates to the technical field of composite material preparation, and discloses a high-load composite material telegraph pole and a pultrusion preparation method thereof.The method comprises the steps of fiber configuration, resin matrix preparation, dipping, preforming, pultrusion and aftertreatment. Wherein the proportion of fibers for direct yarn feeding accounts for a high proportion of the total mass of the fibers, the fibers are distributed in the longitudinal direction of a product, the longitudinal reinforcing effect of the telegraph pole is guaranteed, the loading capacity and mechanical strength of the product are improved, meanwhile, the tension of the fibers is controlled through a tension control system, the stability of the fibers before dipping is guaranteed, and a fiber reinforcing system is optimized; the functional additive is added, and the functional additive comprises nano silicon dioxide subjected to plasma surface treatment and a silane coupling agent, so that the uniformity and dispersity of a resin matrix are improved, the interface bonding of fibers and resin is enhanced, and the overall performance of the composite material is improved.

The invention relates to the field of automobile part manufacturing, in particular to an automobile seat cross beam reinforcing framework and a manufacturing method. The structure comprises a framework beam structure arranged between an automobile chassis and a seat cross beam, the structure is in a hollow beam shape with an inner cavity with two open ends, coating grooves are formed in the two sides of the upper end face and the lower end face, and SNS polystyrene foam is arranged in the grooves; the skeleton beam structure is provided with a first electrophoresis liquid tank, a second electrophoresis liquid tank and corresponding electrophoresis liquid holes, and is internally provided with a reinforcing beam; the framework beam structure is formed by a continuous fiber reinforced composite material containing polyurethane resin and a fiber reinforced body through mold closing pultrusion. The manufacturing method of the reinforced framework comprises the steps of fiber material arrangement, resin injection, pultrusion curing and the like. According to the application, the effects of reducing the weight of the seat, improving the comfort and torsion resistance of the seat, improving the electrophoresis quality, reducing the noise and vibration, realizing automatic production and improving the production efficiency and the product quality stability are achieved.

The invention relates to the technical field of transmission shaft machining, in particular to a kinetic energy transmission shaft body and a machining process integrating pultrusion, weaving, winding and glue injection, the kinetic energy transmission shaft body comprises a shaft body, the shaft body is formed by winding a continuous composite material reinforced thermosetting resin prepreg tape, and a composite material comprises a reinforcing material, a base material, a functional additive and filler; a plurality of limiting grooves are formed in the inner wall of the shaft body, the limiting grooves extend in the axial direction of the shaft body, the length of the limiting grooves is consistent with that of the shaft body, and pultrusion, weaving, winding and glue injection processes are organically integrated, so that the manufactured kinetic energy transmission shaft body has high specific strength, high torsional rigidity, excellent interlayer bonding performance and good dynamic stability; meanwhile, a limiting groove can be precisely machined in the inner wall of the shaft body, the high-precision torque transmission requirement is met, and the defects that a traditional metal shaft body is heavy and prone to corrosion and layers of a single composite material shaft body are prone to layering are overcome.

A laying structure of and a laying implementation method for a thick-walled multi-cavity pultruded beam in the shape of a Chinese character "目" for a vehicle body, relating to the technical field of rail transit. The laying structure comprises a first cavity region (1), a second cavity region (2), a third cavity region (3), and an outer skin region (4) that are all formed by laying multi-axial fabrics. The second cavity region (2) is located between the first cavity region (1) and the third cavity region (3), and the first, second and third cavity regions are collectively wrapped by the outer skin region (4) to form a rectangular structure in the shape of the Chinese character "目". In the laying structure of a thick-walled multi-cavity pultruded beam in the shape of the Chinese character "目" for a vehicle body, quasi-isotropic mechanical properties of the thick-walled multi-cavity pultruded beam in the shape of the Chinese character "目" for a vehicle body are achieved by laying multi-axial fabrics; moreover, the laying structure is adapted to a pultrusion process, and optimizes the structural design, improving the overall rigidity and strength.

The invention provides a high-temperature-resistant optical fiber intelligent rib and a manufacturing method of an intelligent rib and a steel strand thereof, and the manufacturing method of the high-temperature-resistant optical fiber intelligent rib comprises the following steps: 1, forming a high-molecular polymer loose tube outside an optical fiber, and placing the loose tube in a pre-forming mold; the method comprises the following steps of 1, preparing a high-molecular polymer loose tube, 2, paving the carbon fibers mixed with a small amount of S-shaped glass fibers outside the high-molecular polymer loose tube, and finally, placing basalt fibers on the outermost layer, and 3, forming an optical fiber composite fiber rib by utilizing a pultrusion process, and placing the basalt fibers on the outermost layer to form the fiber composite fiber rib. The intelligent steel strand can be directly stranded together with a steel wire and subjected to high-temperature stabilization treatment.

The invention relates to continuous and efficient plant fiber yarn processing equipment and an automatic control method. The method comprises the following steps: setting parameters; constant tension establishment: the PLC realizes constant tension conveying based on tension feedback and speed feedforward; pre-infiltration is carried out; performing total immersion modification: running the yarns in a modification tank along a Z-shaped path, and starting ultrasonic oscillation at the same time; performing infrared preheating; washing and liquid squeezing: guiding the yarns into a washing unit to remove residual modified liquid, and then performing secondary liquid squeezing by a liquid squeezing unit to stabilize the moisture content; partitioned drying: performing roller surface contact heating and forced air drying; the tension and the temperature are monitored on line, and when the tension or the temperature exceeds the limit, a PLC conducts automatic linkage correction; cooling and rolling; and linkage control: performing master-slave or synchronous control with downstream pultrusion equipment according to the speed / tension signal. Compared with the prior art, the device has the advantages of realizing efficient and continuous automatic production, improving the efficiency, improving the modification uniformity and penetration depth, improving the product performance and the like.

The invention discloses a glass fiber pultrusion material density non-contact detection method, electronic equipment and a medium, and the glass fiber pultrusion material density non-contact detection method comprises the following steps: establishing a glass fiber pultrusion material density detection model based on a near infrared spectrum; and obtaining the original near-infrared diffuse reflection spectrum of the glass fiber pultrusion material to be detected and obtaining the density value of the glass fiber pultrusion material to be detected. By adopting the non-contact detection method for the density of the glass fiber pultrusion material, the electronic equipment and the medium, the non-destructive off-line detection of the glass fiber pultrusion material can be realized, the non-contact detection method is particularly suitable for the on-line detection of the glass fiber pultrusion material, and the non-contact detection of the density of the glass fiber pultrusion material can be realized by directly carrying out rapid and efficient non-destructive detection on a product at a production line outlet. A density detection result can be reflected to a production end in real time, so that real-time online optimization and adjustment of production process parameters are realized, and the production stability and the quality stability of the glass fiber pultrusion material are improved.

The invention relates to a method for manufacturing a reinforcement structure for a wind turbine blade (10), the method comprising the steps of: 1) arranging a plurality of strips (63) of fibrous reinforcement material into adjacent stacks (65a, b, c) of strips forming a layered structure (61) having a plurality of fibrous reinforcement layers (67) wherein adjacent ones of the plurality of fibrous reinforcement layers are separated by an intermediate layer (66), according to the invention, at least one separator comb (70) is provided for the resin (1, 2), the at least one separator comb comprising: a base region (71) and a tooth region (73) comprising a plurality of teeth (74) extending from the base region (71), where the plurality of teeth (74) are arranged with a linear array of gaps (79) between adjacent teeth (74), the gaps (79) being configured for allowing the resin to flow from one side of the separator comb (70) to the other side of the separator comb (70), and wherein the plurality of teeth (74) are configured for penetrating the intermediate layer (66), 3) inserting the at least one separating comb (70) between two adjacent stacks (65a, b, c) of strips and penetrating the plurality of intermediate layers (66) with the plurality of teeth (74) such that a plurality of strips (63) of the adjacent stacks (65a, b, c) of strips are separated by the at least one separating comb (70), 4) after inserting the at least one separating comb (70) between the adjacent stacks (65a, b, c) of strips, the method includes (1) optionally moving the layered structure (61) into a desired position, such as into a wind turbine blade shell mold, (5) optionally removing the at least one divider comb (70), and (6) infusing the layered structure with a resin to form a reinforcing structure (78).

Technical Description of Basalt Fibers as Reinforcement Basalt fibers can be processed into reinforcement in concrete in a wide variety of forms. The starting point for all reinforcement products considered here is continuous basalt fibers. Short-fiber concretes, which are subject to separate considerations, are therefore not included in this compilation. Following production, the filaments are generally bundled into rovings and processed either by pultrusion into one-dimensional rods, profiles, or lamellae, or by textile manufacturing processes such as embroidery or knitting into two- or multi-dimensional textiles [1]. Reinforcement products manufactured by pultrusion are always a two-component system consisting of the fibers and an impregnation of a (polymeric) matrix. These are called fiber-reinforced plastics (FRP).Textiles can, in principle, be manufactured without impregnation, as the sewing thread provides a certain degree of stabilization. However, this comes at the cost of reduced strength and stiffness, since only the outer filaments are in direct contact with the concrete, while the inner filaments are activated solely through friction. Furthermore, impregnation protects the filaments from the alkaline environment of the concrete. Therefore, according to current technological standards, textiles are also impregnated. The chemical composition of the fibers and the matrix, as well as the fiber volume ratio, significantly determine the properties of the reinforcement product.

The utility model discloses a heating plate thermal insulation device for pultrusion, which comprises a heating plate, a pultrusion mold matched with the heating plate is fixedly connected onto the inner wall of the heating plate, heat conduction pipes are mounted on the outer walls of two ends of the heating plate, and a thermal insulation device matched with the heating plate is fixedly connected onto the outer wall of the heating plate. The heating plate heat preservation device for pultrusion is characterized in that the heat preservation device is of a multi-layer composite structure, the multi-layer composite structure comprises a heat preservation plate outer layer, a heat preservation plate middle layer and a heat preservation plate inner layer, and a heating plate plug port is formed in the outer wall of one end of the heating plate. The heat preservation layer is completely attached to the outer wall of the heating plate, the problems of heat preservation dead corners, serious heat loss and the like of the heating plate are solved, the heat preservation layer is of a multi-layer composite structure, heat conduction, convection and radiation loss are effectively prevented, the energy utilization rate is increased, and the pultrusion quality is guaranteed.

The invention discloses a preparation and test method of a pultrusion plate splicing seam tensile spline for a wind power blade. The preparation tool comprises an electric heating platform, a spline pouring forming area and a vacuum exhaust hood. The sample strip pouring forming area is arranged in an area covered by the vacuum exhaust hood on the electric heating platform, and is formed by splicing pultrusion plates between the two pultrusion plates in a surrounding manner; a cushion block for preventing the two pultrusion plates from moving oppositely is arranged at each of the two ends of the pultrusion plate abutted seam, so that the pultrusion plate abutted seam can always meet the size requirement of a target abutted seam sample strip. Therefore, the technical problem that the gap of the splicing seam between existing pultrusion plates is not accurate can be solved.

This invention relates to the field of centralized feeding equipment technology, and discloses a centralized feeding device for pultrusion line glue injection, including a feeding hopper. A suction pipe is fixedly connected to the top of the feeding hopper, and a one-way valve is installed on the outer wall of the suction pipe. A connecting cylinder is fixedly connected to the top of the suction pipe, and an exhaust pipe is fixedly connected to the bottom of the connecting cylinder. A two-way valve is installed on the outer wall of the exhaust pipe. A piston rod is slidably connected to the top of the connecting cylinder, and a piston plate is fixedly connected to the bottom of the piston rod. A connecting plate is fixedly connected to the top of the piston rod, and the bottom of the actuating rod is fixedly connected to the output end of a cylinder. By extending and retracting the cylinder, the connecting plate drives the piston rod to slide within the connecting cylinder. The piston plate moves accordingly, and the piston rod drives the piston plate to move upwards. Gas in the feeding hopper enters the connecting cylinder. When moving downwards, the gas is discharged through the exhaust pipe, achieving auxiliary air bubble discharge from the feeding hopper and effectively reducing air bubbles generated during mixing in the feeding hopper.

The invention discloses a high-speed pultrusion optical cable reinforcing core and a production process thereof, and the core comprises an outer sheath, the outer surface of the outer sheath is provided with a directional diameter, the interior of the outer sheath is fixedly connected with an aluminum-plastic composite layer, the outer surface of the aluminum-plastic composite layer is provided with a ring groove, the interior of the aluminum-plastic composite layer is provided with a vertical groove, and the vertical groove is provided with an annular groove. A wrapping layer and a cable core filling layer are fixedly connected in the aluminum-plastic composite layer, an embedding groove is formed in the cable core filling layer, a center reinforcing rib is fixedly connected in the embedding groove, the center reinforcing rib is provided with three sets of supporting plates, and deformation grooves are formed in the outer surfaces of the three sets of supporting plates. According to the utility model, through the arrangement of the central reinforcing rib and the deformation grooves formed in the supporting plates connected with the central reinforcing rib, the optical cable has the bending characteristic while the passing strength of the optical cable is improved.

The utility model discloses pultrusion equipment with a noise reduction function, which belongs to the field of glass fiber reinforced plastic processing and comprises a pultrusion frame, pultrusion main rollers are rotatably connected to the tops and the bottoms of two sides of inner cavities at two ends of the pultrusion frame, and a plurality of pultrusion auxiliary rollers are arranged among the four pultrusion main rollers. Sound insulation plates are fixedly connected to the two sides, the top and the bottom of an inner cavity of the pultrusion frame, and side plates are fixedly connected to the tops and the bottoms of a feeding port and a discharging port of the pultrusion frame; according to the pultrusion equipment with the noise reduction function, noise reduction cavities are formed in the side plates, conduction plates are arranged to make direct contact with glass fiber reinforced plastics, the noise reduction effect of the equipment is further enhanced, guide rails and guide grooves are formed in the noise reduction cavities, stable sliding of the conduction plates is ensured, and the stability and durability of the equipment are improved; and the noise reduction cavity is internally provided with the sound absorption cotton and the arc-shaped elastic piece, the noise reduction performance of the equipment is further improved, the design of the arc-shaped elastic piece is optimized, and the equipment can better adapt to noise fluctuation.

The application provides a core positioning method and positioning jig, and the method comprises the following steps: providing a core-pulling mold, at least one core limiting part and a core positioning structure. The core-pulling mold comprises an upper mold, a lower mold and an elongated core. The core limiting part is positioned and matched with at least the cavity wall of the lower cavity of the lower mold, and the elongated core is matched with the core limiting part to accurately limit the position of the elongated core. The fixed part of the elongated core is fixed through the core fixing structure, and the core limiting part is removed, so that the core-pulling mold cavity is formed between the core and the upper mold and the lower mold. The core positioning method is convenient to operate, can effectively improve the core positioning efficiency, reduce the labor cost, improve the accuracy of core positioning, and effectively control the uniformity of the wall thickness of the pultrusion product.

The invention provides a composite pultrusion product tracing and marking device, a production system and a method, and relates to the technical field of composite pultrusion product production, the composite pultrusion product tracing and marking device comprises a printing roller and an ink storage box, the printing roller is suitable for being connected with a pultrusion unit, and the pultrusion unit is used for pultrusion a composite into a composite pultrusion product to be output; the composite pultrusion product is provided with a printing face facing the peripheral face of the printing roller, the peripheral face of the printing roller can make rolling contact with the printing face, and when the composite pultrusion product moves in the conveying direction of the printing roller, the printing roller rotates relative to the composite pultrusion product under the action of friction force between the printing roller and the printing roller; printing patterns are arranged on the peripheral face of the printing roller, the ink storage box is provided with a first containing cavity used for containing ink, the first containing cavity is connected with the printing roller to guide the ink to the printing patterns, and the printing patterns can print marks on the printing face. The labor cost, bar code label wrong pasting and identification error risks are effectively reduced, and the identification efficiency is improved.

This invention discloses a CFC composite material skeleton, a molding method, and a vehicle reinforcement skeleton, relating to the field of CFC composite material technology. It includes a CFC skeleton body, SNS covering grooves formed on the CFC skeleton body, and SNS foam filling the SNS covering grooves. The CFC skeleton body is adapted to be installed in the cavity of an automotive sheet metal. The SNS foam can foam under the electrophoretic heating effect of the vehicle. This invention uses a material combination of polyurethane and high-strength, high-modulus glass fiber, molded through an online pultrusion weaving process. The use of continuous fibers gives the skeleton excellent mechanical properties in the 0° and 90° directions, significantly improving the tensile and bending strength of the automotive sheet metal, effectively enhancing the vehicle's resistance to external loads and bending deformation, and solving the problem of poor bending and load-bearing capacity of traditional structures.

The application provides a composite material plate for a ship and a preparation method thereof. The composite material plate for the ship comprises a surface layer and a core layer, the surface layer and the core layer are arranged in a bonded mode, the core layer is a honeycomb structure formed by bonding a plurality of polygonal tubes, and the polygonal tubes are composite material members formed by pultrusion. The polygonal tubes formed by pultrusion are used to form the honeycomb core layer, fibers are arranged continuously along the length direction, the load-carrying capacity is high, the density is low, the high load-carrying and lightweight requirements of the ship are met, the pultrusion process has high production efficiency and low cost, and is suitable for batch production in the field of the ship.

The present application relates to the technical field of pultrusion plate production, and discloses a production equipment for pultrusion plate. The production equipment comprises a pultrusion plate production device, a winding device, a cutting device and an online detection device. The pultrusion plate production device and the winding device are respectively used for manufacturing and winding the pultrusion plate. The online detection device comprises a rack and a detection component. The detection component is electrically connected with a controller. The detection component is used for detecting whether the pultrusion plate has defects. The controller can change the working parameters of the pultrusion plate production device. The cutting device can cut off the defective part of the pultrusion plate. The production equipment for pultrusion plate provided by the present application comprises an online detection device. The defects of the pultrusion plate can be detected in real time through the online detection device. The working parameters of the pultrusion plate production device can be adjusted according to the detection results through the controller. The production of a large number of defective products can be avoided. The material cost is saved. The detection method does not need manual participation. The labor cost is reduced.

The invention belongs to the technical field of photovoltaic modules, and particularly relates to a resin-based composite material applied to a photovoltaic module and a preparation method of the resin-based composite material. The preparation method of the resin-based composite material comprises the following steps: S1, dispersing a mixture of a cyclic olefin material, a curing agent and a coupling agent to obtain a blend; s2, mixing the blend obtained in the step S1 with fibers, and carrying out pultrusion to obtain a pre-cured molded body; and S3, carrying out secondary processing on the pre-cured molded body obtained in S2 to obtain the composite material. The bending strength, ultraviolet resistance and salt spray corrosion resistance of the composite material prepared by the method provided by the invention are greatly improved.

The invention relates to the technical field of protective fence manufacturing, in particular to a seaside protective fence and a pulling and aligning preparation method thereof. The fiber bundles subjected to surface treatment are drawn for the first time and soaked in a resin glue solution, and after forming, the material is drawn for the second time and continuously drawn out; the speed of the first traction and the speed of the second traction are both 0.5-2 m / min. According to the method, corrosion-resistant thermosetting resin and a fiber material are selected and combined with an added weather-resistant additive, so that the protective fence can effectively resist corrosion of seawater, sea wind and the like, the service life is greatly prolonged, and the maintenance cost is reduced; the pultrusion process can enable the fibers to be uniformly distributed in a resin matrix and increase the content, so that the strength and the impact resistance of the protective fence are improved, and the protective fence can bear external forces such as strong wind and sea wave impact on the seaside; by means of the connecting structure and the wavy baffle structure of the seaside protective fence, the protective fence can keep good structural stability in the complex seaside environment, and normal exertion of the protective function is guaranteed.

The present invention belongs to the technical field of core rods for composite insulating crossarms, and particularly relates to a core rod for a composite insulating crossarm and a preparation method therefor. The core rod for a composite insulating crossarm comprises a polymer resin-hollow microsphere composite core and a fiber-cloth-reinforced polymer-resin-based composite layer, wherein the fiber-cloth-reinforced polymer-resin-based composite layer is laid on the outer surface of the polymer resin-hollow microsphere composite core in a directional manner, and the fiber-cloth-reinforced polymer-resin-based composite layer and the polymer resin-hollow microsphere composite core are integrated into one body by means of vacuum infiltration with a resin and curing; and the polymer resin-hollow microsphere composite core is a composite material core formed by curing the resin and hollow microspheres. Compared with a solid composite core, the core rod for a composite insulating crossarm in the present invention has a relatively low weight. Moreover, the composite core rod prepared by means of a vacuum infiltration process has a dense structure, and exhibits better dye penetration into materials, better water diffusion and a better dielectric strength as compared with a composite core rod formed by means of a pultrusion process.

The invention provides an auxiliary traction method applied to a pultrusion process. The auxiliary traction method comprises the following steps: calculating a traction force required by a to-be-extruded finished product; if the required traction force is smaller than the strength of the guide rope, the guide rope is used for being connected with the end of the to-be-extruded finished product, and traction of the to-be-extruded finished product is executed through the guide rope; otherwise, the finished product to be extruded and pulled, the high-strength traction belt and the traction rope are sequentially connected, and traction of the finished product to be extruded and pulled is executed through the high-strength traction belt; the guide rope is arranged in the auxiliary traction device, and the auxiliary traction device is used for tensioning the guide rope and winding the guide rope. The traction device has the beneficial effects that according to different application scenes, two schemes are designed to meet the requirements of different product sections and pultrusion speeds, and the labor cost is saved while waste of glass fiber dry yarn raw materials in the pultrusion starting stage is reduced; and the auxiliary traction device provides continuous pulling force and automatically rolls, and the starting speed of the composite material pultrusion process can be matched.

The utility model relates to the technical field of pultrusion material production of glass fiber and carbon fiber etc. especially relates to a pneumatic yarn joining device, including pneumatic drive arrangement, still include: axial closed -loop chamber device, including main frame, limit block, the sliding block is arranged between main frame and limit block and slides, the air hole is set up along its axial in main frame, main frame sets up U type groove, the slide hole is set up in limit block, the connecting rod is arranged in the slide hole and slides, the spring is set up in connecting rod sleeve, the slide hole is located and sets up the limit ring, manual back -and -forth device is used for pulling the sliding block to move, the utility model has the following beneficial effect: high degree of automation: can automatically complete the joint of yarn, improves production efficiency, the reliability is strong: adopts pneumatic drive, and the action is stable and reliable, is applicable to the particularity of glass fiber and carbon fiber, simple operation: single hand can pull the trigger of the pull rod and buckle pressure air gun, therefore convenient for the operation of manual control device, simple and easy to use.

The present invention relates to a method for producing a tubular composite structure with longitudinal axis (AX), the method comprising successively: - a step of forming a raw material (10) by means of constructing by stacking material at least one tubular sandwich (S) with longitudinal axis (AX), said tubular sandwich (S) comprising two layers of filament winding (11, 14) based on raw resin and carbon fibers, and a series of pultruded spacers (13) based on carbon fibers and resin at least partially cured, the pultruded spacers (13) being arranged radially to the longitudinal axis (AX) between the two layers of filament winding (11, 14); and - a step of curing the raw material (10) to obtain the composite tubular structure.

This invention discloses a composite material trench cover and its preparation method. The method employs a continuous pultrusion molding process, in which continuous glass fiber roving is oriented according to a continuous profile pre-formed structure via a guide plate, and combined with dry surface felt and dry continuous filament felt to form a mixed reinforcement. The mixed reinforcement is then fed into the injection chamber of a molding die, where a corrosion-resistant resin matrix is ​​injected to complete in-mold impregnation. After heating and cross-linking curing, a continuous profile with a multi-cavity structure is formed, which is then drawn and cut to a fixed length to obtain the finished product. This invention solves the problems of poor surface quality, difficulty in balancing high load-bearing capacity and lightweight design, and high customization costs associated with existing processes. The resulting product combines high flatness, strong corrosion resistance, and excellent load-bearing performance, adapting to various application scenarios.

The invention relates to the technical field of composite material preparation, in particular to a spandex and polyimide fiber mixed felt cloth and a preparation method and application thereof. The preparation method comprises the following steps: S1, preparing a spandex polyimide fiber; s2, carrying out surface etching; s3, weaving and mixed weaving; and S4, immersing the blended fabric obtained in the step S3 into a coating solution for dip-coating for 30 seconds, and drying at 120 DEG C for 20 minutes to obtain the spandex polyimide fiber blended felt fabric. According to the preparation method disclosed by the invention, through strict spinning and heat treatment processes, the obtained spandex polyimide fiber has high heat resistance, high strength and stability, and is suitable for a high-temperature environment of pultrusion.

This invention relates to a polyurethane reactive system for producing pultruded parts containing reinforcing fibers and its uses.