Pultrusion profile rotating cylinder and forming method thereof

Abstract

The pultrusion profile rotating cylinder is characterized by comprising pultrusion profiles of at least one specification, the multiple pultrusion profiles are sequentially spliced end to end to form the rotating cylinder, the splicing faces of the adjacent pultrusion profiles are bonded together, the length of the pultrusion profiles is equal to the length of the rotating cylinder, the inner side faces and the outer side faces of the pultrusion profiles are arc faces, and the outer side faces of the pultrusion profiles are arc faces. The arc radius of the inner side face of each pultrusion profile is equal to the inner diameter of the rotating cylinder, the arc radius of the outer side face of each pultrusion profile is equal to the outer diameter of the rotating cylinder, and the outer side faces of the multiple pultrusion profiles are sequentially connected to form a flat rotating cylinder outer wall. The rotary cylinder is stable and reliable in structure, free of axial splicing, low in production cost and high in efficiency, the structural strength and the mechanical property of a product are effectively improved, the weight of the rotary cylinder is effectively reduced, the size precision and the surface flatness are improved, the mass uniformity of the rotary cylinder can be effectively improved, and counterweight treatment after forming is omitted. The invention further provides a forming method of the pultrusion profile rotating cylinder.

Description

Technical Field

[0001] The present invention relates to a pultruded profile rotating cylinder and a forming method thereof, belonging to the technical field of cylinder forming. Background Art

[0002] The main working component of a rotating cylinder sail is a rotating cylinder (rotor body). To reduce application costs, lightweight design is generally adopted, and currently, glass fiber composite materials are mainly used. For example, the rotor tube of patent CN 117120247 A is formed by winding. The first fiber is wound around a mandrel to form a tubular first skin, the second fiber forms a plurality of strips, the strips are attached to the surface of the first skin, and the third fiber is wound around the strips to form a second skin. The biggest disadvantage of the winding process is that the fiber direction is limited, and it is difficult to fully exert the performance of the fiber material. Moreover, its outer surface is a free surface, and its quality and appearance are difficult to control, requiring subsequent processing and weight balancing. The arc-shaped panel of patent CN 106103269 is formed by vacuum infusion molding, and then the rotor body is formed by splicing multiple arc-shaped panels in the circumferential and axial directions. The vacuum infusion molding has the characteristic of flexible design, but it also has disadvantages such as high mold cost, complex process flow, much manual participation, long production cycle, etc. Moreover, the inner surface of the rotor body is a free surface, and its size and shape are difficult to control, and the quality characteristics are difficult to control, requiring subsequent processing and weight balancing. Therefore, the current forming process of the rotating cylinder has the following problems: 1. Both the winding forming process and the vacuum infusion molding process have free surfaces, and their sizes and surface qualities are difficult to control, requiring subsequent processing and weight balancing.

[0003] 2. Large equipment or molds are required for the rotor body, and the requirements for the production site and investment are relatively high.

[0004] 3. The axial connection of the rotor body uses bonding and fasteners, which affects the structural strength and mechanical properties.

[0005] 4. The cylinder walls of the rotor body are all of sandwich structures, with complex structures. The foam in the vacuum infusion process is mainly used for forming, rather than carrying the main material, increasing the weight of the rotor body; the addition of strips in the winding forming is mainly to replace the foam in the vacuum infusion process, and it can also increase the number of fibers in the axial direction and enhance the axial performance, but at the same time, it also increases the weight of the rotor body. Summary of the Invention

[0006] The pultruded profile rotating cylinder provided by the present invention has a stable and reliable structure, does not require axial splicing, effectively improves the structural strength and mechanical properties of the product, effectively reduces the weight of the rotating cylinder, improves the dimensional accuracy and surface flatness, can effectively improve the mass uniformity of the rotating cylinder, eliminates the weight balancing treatment after forming, has low production cost and high efficiency. The present invention also provides a forming method of a pultruded profile rotating cylinder.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: A pultruded profile rotating cylinder, characterized in that it comprises at least one specification of pultruded profiles, and a plurality of pultruded profiles are spliced end to end in sequence to form a rotating cylinder. The splicing surfaces of adjacent pultruded profiles are bonded together. The length of the pultruded profile is equal to the length of the rotating cylinder. The inner and outer sides of the pultruded profile are both arc surfaces. The inner arc radius of the pultruded profile is equal to the inner diameter of the rotating cylinder, and the outer arc radius is equal to the outer diameter of the rotating cylinder. The outer sides of a plurality of pultruded profiles are sequentially connected to form a flat outer wall of the rotating cylinder.

[0008] Preferably, the rotating cylinder is spliced by pultruded profiles of one specification, and the inner sides of a plurality of pultruded profiles are sequentially connected to form a flat inner wall of the rotating cylinder.

[0009] Preferably, the head and tail ends of adjacent pultruded profiles are spliced in a concave-convex fit, and the cross-section of the pultruded profile includes at least one polygon.

[0010] Preferably, the protruding end of the pultruded profile is a solid structure, or the protruding end of the pultruded profile is a hollow structure and the wall thicknesses of the two ends in concave-convex fit are equal.

[0011] Preferably, the cross-section of the pultruded profile is in a zigzag shape with a plurality of corners, and adjacent pultruded profiles overlap each other to enclose a polygon.

[0012] Preferably, the rotating cylinder is spliced by pultruded profiles of two specifications. The head and tail ends of one specification of pultruded profile both protrude outward, and the head and tail ends of the other specification of pultruded profile both recess inward. The rotating cylinder is formed by alternately splicing pultruded profiles of two specifications.

[0013] Preferably, both the inner and outer surfaces of the pultruded profile adopt multi-directional fiber fabrics.

[0014] The forming method of the above-mentioned pultruded profile rotating cylinder is characterized in that: first, according to the mechanical properties, load-bearing and weight requirements of the rotating cylinder, select the fiber composite material used for the pultruded profile and determine the specifications and quantities of the pultruded profiles. Determine the length, arc angle, inner arc radius and outer arc radius of the pultruded profile according to the length, inner diameter and outer diameter of the rotating cylinder. Then, the fiber composite material is made into a pultruded profile through a pultrusion process. After that, a plurality of pultruded profiles are spliced end to end in sequence and bonded with an adhesive to form a rotating cylinder.

[0015] Preferably, according to the structural strength requirements of the rotating cylinder, rivets or screws are used to connect at the splicing joints of adjacent pultruded profiles.

[0016] The beneficial effects of the invention are: The pultruded rotating cylinder of the present invention is formed by successively splicing a plurality of pultruded profiles end to end. The pultruded profile has a simple structure, stable performance, and high production automation. Omitting the sandwich layer can effectively reduce the weight of the rotating cylinder. Moreover, the surfaces of the pultruded profiles are all die surfaces, and the dimensional accuracy and flatness of the inner and outer surfaces of the spliced rotating cylinder are higher, enabling the outer sides of the plurality of pultruded profiles to be successively connected into a flat outer wall of the rotating cylinder, effectively reducing the subsequent processing amount and difficulty. The mass distribution of the pultruded profiles is uniform, which can effectively improve the mass uniformity of the rotating cylinder and eliminate the need for weight balancing treatment after forming.

[0017] The mold scale required for pultruding profiles is much smaller than that of winding or vacuum infusion molding processes, which can effectively reduce the production site requirements. There is no need for a dedicated large mold site, and a simple production site can meet the production requirements of the rotating cylinder. The production line maintenance and mold storage costs are lower. For rotating cylinders of different diameter specifications, only a new pultrusion mold needs to be opened, with low production costs and high efficiency.

[0018] A plurality of pultruded profiles are successively spliced end to end, and the splicing surfaces of adjacent pultruded profiles are bonded together, with a stable and reliable structure. There is no need for splicing in the axial direction, effectively improving the structural strength and mechanical properties of the product. For rotating cylinders of different axial lengths, there is no need to adjust or separately manufacture production molds, and only the length of the profile needs to be cut to a fixed length, saving mold investment and its site occupation. Brief Description of the Drawings

[0019] Figure 1 It is a cross-sectional schematic view of the pultruded profile rotating cylinder of the present invention.

[0020] Figure 2 It is a schematic view of the splicing of pultruded profiles with only one polygon in the cross-section in Embodiment 1.

[0021] Figure 3 It is a schematic view of the splicing of solid pultruded profiles at the protruding end in Embodiment 1.

[0022] Figure 4 It is a schematic view of the splicing of pultruded profiles with multiple polygons in the cross-section in Embodiment 1.

[0023] Figure 5 It is a schematic view of the splicing of pultruded profiles in Embodiment 2.

[0024] Figure 6 It is a schematic view of the alternating splicing of two specifications of pultruded profiles in Embodiment 3.

[0025] Figure 7 It is another schematic view of the alternating splicing of two specifications of pultruded profiles in Embodiment 3. Detailed Description of the Embodiments

[0026] The following is combined with Figures 1-7A detailed description of the embodiments of the present invention will be given. Embodiment 1:

[0027] The pultruded profile rotating cylinder is characterized in that it includes at least one specification of pultruded profile 1. A plurality of pultruded profiles 1 are sequentially spliced end to end to form a rotating cylinder 2. The splicing surfaces of adjacent pultruded profiles 1 are bonded together. The length of the pultruded profile 1 is equal to the length of the rotating cylinder. The inner and outer sides of the pultruded profile 1 are both arc surfaces. The inner arc radius of the pultruded profile is equal to the inner diameter of the rotating cylinder, and the outer arc radius is equal to the outer diameter of the rotating cylinder. The outer sides of a plurality of pultruded profiles 1 are sequentially connected to form a flat outer wall of the rotating cylinder.

[0028] The above-mentioned pultruded profile rotating cylinder is formed by sequentially splicing a plurality of pultruded profiles 1 end to end. The pultruded profile has a simple structure, stable performance, and high degree of production automation. Omitting the sandwich layer can effectively reduce the weight of the rotating cylinder. Moreover, the surfaces of the pultruded profiles are all die surfaces, and the dimensional accuracy and flatness of the inner and outer surfaces of the spliced rotating cylinder are higher, enabling the outer sides of a plurality of pultruded profiles to be sequentially connected to form a flat outer wall of the rotating cylinder, effectively reducing the subsequent processing amount and difficulty. The mass distribution of the pultruded profile is uniform, which can effectively improve the mass uniformity of the rotating cylinder and eliminate the need for weight balancing treatment after forming. The mold scale required for pultruded profile forming is much smaller than that of winding or vacuum infusion molding processes, which can effectively reduce the production site requirements. There is no need for a large dedicated mold site, and a simple production site can meet the production requirements of the rotating cylinder. The production line maintenance and mold storage costs are lower. For rotating cylinders of different diameter specifications, only a new pultruded mold needs to be opened, with low production costs and high efficiency. A plurality of pultruded profiles 1 are sequentially spliced end to end, and the splicing surfaces of adjacent pultruded profiles 1 are bonded together, with a stable and reliable structure. There is no need for splicing in the axial direction, effectively improving the structural strength and mechanical properties of the product. For rotating cylinders of different axial lengths, there is no need to adjust or manufacture additional production molds, and only the length of the profile needs to be cut to a fixed length, saving mold investment and its site occupation.

[0029] Among them, the rotating cylinder 2 is formed by splicing pultruded profiles 1 of one specification. The inner sides of a plurality of pultruded profiles 1 are sequentially connected to form a flat inner wall of the rotating cylinder. The head and tail ends of adjacent pultruded profiles 1 are spliced with concave-convex cooperation. The cross-section of the pultruded profile 1 includes at least one polygon. The protruding end of the pultruded profile 1 is a solid structure, or the protruding end of the pultruded profile is a hollow structure and the wall thicknesses of the two ends with concave-convex cooperation are equal. The inner and outer surfaces of the pultruded profile 1 both adopt multi-directional fiber fabrics.

[0030] As Figures 2-4As shown, only one specification of pultruded profiles is used, reducing the number of molds for pultruded profiles. For pultruded profiles of the same specification, the dimensional error is smaller, and the surface flatness of the spliced rotating cylinder 2 is higher. Multiple pultruded profiles are spliced to form the rotating cylinder 2. The inner and outer walls of the rotating cylinder 2 are respectively formed by connecting the inner and outer sides of the pultruded profiles. The inner and outer walls of the rotating cylinder 2 are both complete cylindrical surfaces, which can improve the structural strength of the rotating cylinder 2 and meet the assembly structure requirements for the integrity of the inner and outer walls of the rotating cylinder 2. The head and tail ends of the pultruded profiles are respectively concave and convex in shape. Multiple pultruded profiles are sequentially spliced end to end, and adjacent pultruded profiles form a concave-convex fit, increasing the splicing area and improving the structural strength at the splicing position. As Figure 3 shown, in order to further improve the structural strength at the splicing position of adjacent pultruded profiles, the protruding end of the pultruded profile is set as a solid structure, or as Figure 2 and 4 shown, when the protruding end of the pultruded profile is a hollow structure, the ends of the concave-convex fit of adjacent pultruded profiles are set to have equal wall thicknesses, increasing the thickness at the splicing position. In this way, connecting rivets or screws can be provided at the splicing position of adjacent pultruded profiles, improving the structural strength at the splicing position and ensuring that the splicing position will not be deformed or damaged due to the insertion of rivets and screws, thereby improving the structural reliability of the rotating cylinder 2; the cross-section of the pultruded profile is set as one or more polygons. As Figure 5 shown, there are two polygons in the cross-section of the pultruded profile, which can improve the structural strength of the pultruded profile. The structure of the cross-section of the pultruded profile can be set according to the mechanical property requirements of the rotating cylinder to ensure that the rotating cylinder 2 formed by splicing multiple pultruded profiles meets the requirements for axial and radial load bearing. The inner and outer surfaces of the pultruded profile 1 both adopt multi-directional fiber fabrics, which can enhance the mechanical properties in the circumferential direction of the rotating cylinder, improve the torsional stiffness of the rotating cylinder during circumferential load bearing, and meet the requirements for circumferential load bearing of the rotating cylinder 2. Embodiment 2:

[0031] The difference from Embodiment 1 is that the cross-section of the pultruded profile 1 is in a zigzag shape with multiple corners, and adjacent pultruded profiles overlap and enclose a polygon. As Figure 5 shown, multiple pultruded profiles 1 are sequentially overlapped end to end, and adjacent pultruded profiles enclose a polygon. The mold for the pultruded profile is simpler. Although the structural strength of a single pultruded profile is lower, adjacent pultruded profiles 1 enclose a polygon, which can also ensure the structural strength of the rotating cylinder 2. Embodiment 3:

[0032] The difference from Embodiment 1 is that the rotating cylinder 2 is spliced from two specifications of pultruded profiles 1. As Figure 6 and 7As shown, both the head and the tail ends of the pultruded profile of one specification bulge outwards, while both the head and the tail ends of the pultruded profile of another specification indent inwards. The rotating cylinder is formed by alternately splicing the pultruded profiles of the two specifications. The pultruded profiles of the two specifications are alternately spliced to form the rotating cylinder 2, increasing the splicing area and improving the connection strength of the splicing area.

[0033] The present invention also protects a method for forming the rotating cylinder of the pultruded profile described above, which is characterized in that: First, according to the mechanical properties, load-bearing and weight requirements of the rotating cylinder, select the fiber composite material used for the pultruded profile and determine the specifications and quantities of the pultruded profiles 1. Determine the length, arc angle, arc radius of the inner side and arc radius of the outer side of the pultruded profile according to the length, inner diameter and outer diameter of the rotating cylinder. Then, the fiber composite material is made into the pultruded profile through the pultrusion process. After that, multiple pultruded profiles are spliced end to end in sequence and bonded with an adhesive to form the rotating cylinder 2.

[0034] For the forming method described above, first select the forming raw material of the pultruded profile according to the performance requirements of the rotating cylinder, and determine the specifications and quantities of the pultruded profiles 1, that is, determine the cross-sectional structure, size and quantity of the pultruded profiles, so that the rotating cylinder 2 formed by splicing multiple pultruded profiles can meet the requirements of size, strength and weight. Then, the pultruded profile is formed by the pultrusion process, and then the pultruded profiles are spliced. When splicing, an umbilical adhesive is used to bond the splicing surfaces of adjacent pultruded profiles to form a rotating cylinder 2 with a flat surface, qualified size and weight meeting the requirements. Compared with the winding and vacuum infusion forming processes in the prior art, the process of forming by splicing pultruded profiles is simpler, the dimensional accuracy and flatness of the inner and outer surfaces of the spliced rotating cylinder are higher, and the die scale required for forming the pultruded profile is much smaller than that of the winding or vacuum infusion forming process, which can effectively reduce the demand for production sites. There is no need for a special site for large-scale dies, and a simple production site can meet the production requirements of the rotating cylinder. The production line maintenance and die storage costs are lower.

[0035] Among them, according to the structural strength requirements of the rotating cylinder, rivets or screws are used to connect at the splicing points of adjacent pultruded profiles 1. The structural strength at the splicing points of the pultruded profiles is improved, thereby improving the overall structural stability of the rotating cylinder 2.

[0036] The technical solutions of the embodiments of the present invention are completely described above in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

Claims

1. Pultrusion profile rotating cylinder, characterized by: It comprises a pultruded profile of at least one specification, a plurality of pultruded profiles are spliced ​​end to end in sequence to form a rotating cylinder, the splicing surfaces of adjacent pultruded profiles are bonded together, the length of the pultruded profile is equal to the length of the rotating cylinder, the inner side surface and the outer side surface of the pultruded profile are both arc surfaces, the arc radius of the inner side surface of the pultruded profile is equal to the inner diameter of the rotating cylinder, the arc radius of the outer side surface is equal to the outer diameter of the rotating cylinder, and the outer side surfaces of the plurality of pultruded profiles are sequentially connected to form a flat outer wall of the rotating cylinder.

2. The pultruded profile rotating cylinder according to claim 1, characterized in that: The rotating cylinder is formed by splicing pultruded profiles of one specification, and the inner side surfaces of a plurality of pultruded profiles are sequentially connected to form a flat inner wall of the rotating cylinder.

3. The pultruded profile rotating cylinder according to claim 2, characterized in that: The ends of adjacent pultruded profiles are spliced ​​in a concave-convex manner, and the cross section of the pultruded profile includes at least one polygon.

4. The pultruded profile rotating cylinder according to claim 3, characterized in that: One protruding end of the pultruded profile is a solid structure, or one protruding end of the pultruded profile is a hollow structure and the wall thickness of the two ends of the concave and convex matching is equal.

5. The pultruded profile rotating cylinder according to claim 2, characterized in that: The cross section of the pultruded profile is in a zigzag shape with multiple corners, and adjacent pultruded profiles overlap and surround each other to form a polygon.

6. The pultruded profile rotating cylinder according to claim 1, characterized in that: The rotating cylinder is formed by splicing two specifications of pultruded profiles, one specification of the pultruded profile has both ends protruding outward, and the other specification of the pultruded profile has both ends concave inward. The rotating cylinder is formed by alternately splicing the two specifications of the pultruded profiles.

7. The pultruded profile rotating cylinder according to claim 1, characterized in that: The inner surface and the outer surface of the pultruded profile are both made of multi-directional fiber fabrics.

8. The method for forming a rotating drum of a pultruded profile according to any one of claims 1 to 6, characterized in that: Firstly, according to the mechanical properties, load-bearing and weight requirements of the rotating cylinder, the fiber composite material used for the pultruded profile is selected and the specifications and quantity of the pultruded profile are determined. According to the length, inner diameter and outer diameter of the rotating cylinder, the length, arc angle, arc radius of the inner side and arc semi-arc of the outer side of the pultruded profile are determined. Then, the fiber composite material is made into a pultruded profile through the pultrusion process. After that, multiple pultruded profiles are spliced ​​end to end in sequence and bonded with adhesive to form a rotating cylinder.

9. The method for forming a rotating drum of a pultruded profile according to claim 8, characterized in that: According to the structural strength requirements of the rotating cylinder, adjacent pultruded profiles are connected with rivets or screws.

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