A multi-cavity composite profile forming device and assembly method

Abstract

The application is a kind of multi-cavity composite material profile forming device and assembly method. For a kind of multi-cavity composite material profile forming device, including mould frame, one end of mould frame is fixedly connected with forming mould body, core rod is inserted in the inner cavity of forming mould body, left steel belt is arranged on one side of mould frame, horizontal direction tension is applied to core rod; right steel belt is arranged on the other side of mould frame, horizontal direction tension is applied to core rod; adjusting bolt is further arranged on both sides of mould frame, threaded end of adjusting bolt abuts against steel belt, the size of tension and the horizontal position of core rod are adjusted by driving steel belt deformation, the horizontal tension of steel belt to core rod is accurately changed, so that the horizontal position of single core rod is adjusted. Compared with the complex assembly and alignment operation of traditional rigid top wire adjusting structure, the core rod position correction can be completed by simply rotating adjusting bolt, and the adjustment operation process is simple.

Description

Technical Field

[0001] This invention relates to the field of multi-cavity composite material profile preparation technology, specifically a multi-cavity composite material profile molding device and assembly method. Background Technology

[0002] Multi-cavity hollow pultruded profiles made of fiber-reinforced composite materials are widely used in new energy, rail transportation, and construction applications, such as... Figure 12 and Figure 13 As shown, this type of profile consists of multiple cavities arranged densely and spaced along the width direction of the profile.

[0003] Existing pultrusion dies have the following defects when producing this type of profile: 1. Designing an independently adjustable mandrel structure results in some mandrels being excessively long, leading to severe deflection and deformation. Due to the limited space for densely packed mandrels, traditional rigid set screw adjustment supports cannot be placed in the middle of the mandrels, necessitating the extension of the mandrels outwards from the mold. Each mandrel requires an independent adjustment mechanism to adjust its horizontal position; therefore, to provide sufficient installation space for the adjustment mechanism, the extended length of the mandrel is relatively long; moreover, the more cavities there are, the longer the mandrels need to be designed. This causes the mandrel's own weight to generate continuous downward deflection. Simultaneously, the continuous traction of the fiberglass yarn applies lateral tension to the mandrel, causing continuous skewing and shaking in the middle of the mandrel, resulting in uneven wall thickness on the four sides of each cavity and a high rate of product dimensional defects and scrap.

[0004] 2. The spacing between the mandrels is small. If each mandrel is equipped with multiple sets of rigid set screw adjustment seats, physical interference will occur between the supports and bolts. It is impossible to achieve independent fine adjustment of a single mandrel. Only the whole can be adjusted uniformly, and it is impossible to correct local dimensional deviations of a single cavity.

[0005] Therefore, how to overcome the above-mentioned defects has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] To address the technical problems in the background art, this invention discloses a multi-cavity composite material profile forming device and assembly method.

[0007] The present invention provides a multi-cavity composite material profile forming device, including a mold frame, a forming mold body fixedly connected to one end of the mold frame, a plurality of mandrels evenly distributed and spaced apart are inserted in the inner cavity of the forming mold body, a plurality of annular left steel strips are provided on one side of the mold frame, and one end of each left steel strip is wrapped around one side of a mandrel for applying a horizontal tensile force to the mandrel. On the other side of the mold frame, there are multiple annular right steel strips, each of which is wrapped around the other side of a mandrel to apply horizontal tension to the mandrel. The tension forces exerted on the mandrel by the left and right steel strips are in opposite directions; Each mandrel is equipped with a left steel strip and a right steel strip; The mold frame is also equipped with adjusting bolts on both sides that correspond one-to-one with the left and right steel strips and are threadedly connected. The threaded end of the adjusting bolt abuts against the side of the left or right steel strip away from the mandrel. The tension and the horizontal position of the mandrel are adjusted by driving the deformation of the left or right steel strip.

[0008] Furthermore, adjustment blocks are provided on both sides of the mold frame; The adjusting block has a mounting groove that opens towards the mandrel; The adjusting block also has through holes in the upper and lower walls of the through mounting groove. The left or right steel strip is inserted into the hole on the side opposite to the mandrel.

[0009] Furthermore, both the left and right steel strips are sheet-like and each has multiple fixing holes; The two ends of the left or right steel strip overlap to form a ring structure, and the overlap is fixed by fasteners inserted into two fixing holes.

[0010] Furthermore, the vertical dimension of the adjusting block is larger than that of the mandrel, so that the upper and lower sides of the left and right steel strips form an outwardly opening wedge structure.

[0011] Furthermore, the mold frame is also provided with a first preforming plate, a second preforming plate and a third preforming plate arranged at intervals along the length of the mandrel; The yarn and felt pass through the first preforming plate, the second preforming plate and the third preforming plate in sequence and then enter the molding cavity inside the molding mold; Limiting holes are provided on both the first and second preforming plates; the shape of the limiting holes is similar to the cross-sectional shape of the mandrel.

[0012] Furthermore, the portion of the mandrel located inside the molding mold is defined as the molding section, and the portion located outside the molding mold is defined as the pre-forming section; the end cross-sectional area of ​​the pre-forming section is smaller than the end cross-sectional area of ​​the molding section.

[0013] Furthermore, the forming section and the pre-forming section are connected by a connecting section; the top view projection of the connecting sections on both sides is a right trapezoid, with the inclined surface located on the inside; the top view projection of the connecting sections in the middle and other positions is an isosceles trapezoid.

[0014] Furthermore, the left and right steel strips are located between the second and third preforming plates and are wound around the preforming section.

[0015] Furthermore, the first preformed plate is fixedly connected to the end of the mold frame; the four edges of the second and third preformed plates are fixedly connected to the mold frame by bolts.

[0016] The present invention also provides an assembly method for the multi-cavity composite material profile forming device as claimed in the claims, comprising the following steps: S1. Fix the molding body to one end of the mold frame; S2. Install the second preformed plate and the third preformed plate onto the mold frame; S3. Insert the mandrel from the outlet end of the molding die until the preformed section is inserted into the limiting hole of the first preformed plate. S4. Manually adjust the position of the mandrel inside the molding mold to bring it close to the preset position. S5. Install the adjusting blocks on both sides of the mold frame; S6. Connect the adjusting bolt to the adjusting block from the outside to the inside thread; S7. After the left and right steel strips are wrapped around the mandrel and passed through the perforation, the two ends are overlapped to achieve pre-tightening of the mandrel. S8. Tighten the adjusting bolt so that its threaded end abuts against the outside of the left or right steel strip; S9. Continue to tighten the adjusting bolt located on one side of the mold frame to adjust the mandrel to the preset position; S10. Tighten the adjusting bolt located on the other side of the mold frame to lock and secure the mandrel.

[0017] The beneficial effects of this invention are: 1. This invention provides each mandrel with its own independent left and right steel strips and adjusting bolts. By turning the corresponding adjusting bolts, the steel strips are compressed and deformed, precisely changing the horizontal tension of the steel strips on the mandrel, thereby adjusting the horizontal position of a single mandrel individually. Compared to the complex assembly and alignment operations of traditional rigid set screw adjustment structures, this invention only requires a simple rotation of the adjusting bolts to complete the mandrel position correction, making the adjustment process simple.

[0018] 2. This invention uses an annular steel strip to replace the traditional rigid adjustment support. The steel strip is a thin and flexible structure, which occupies very little installation space. There is no need to reserve a large installation area on the outside of the mold, nor is it necessary to extend the mandrel to an excessive length to complete the independent adjustment of a single mandrel. This effectively solves the problem of large space occupation of traditional rigid adjustment structures, and can significantly shorten the overall design length of each mandrel. Moreover, the more cavities there are, the more prominent the effect of space optimization and mandrel length reduction becomes.

[0019] 3. This invention effectively shortens the overall length of the mandrel, significantly reducing the downward deflection caused by the mandrel's own weight. Simultaneously, the shortened mandrel exhibits greater overall rigidity, preventing the problems of mid-section skewing and continuous vibration inherent in traditional long mandrels under the lateral tension generated by continuous yarn traction. The mandrel's installation position within the molding die is more fixed, and its posture is more stable, completely resolving the issue of uneven wall thickness on the four sides of each cavity caused by mandrel deformation and vibration. This improves the dimensional accuracy of multi-cavity profile molding, effectively reduces the rate of product dimensional deviations and scrap, and ensures the stability of product quality in mass production.

[0020] 4. The steel strip used to adjust the horizontal position of the mandrel in this invention is small in size and simple in structure. Multiple sets of steel strips and matching adjusting bolts can be densely arranged on both sides of the mold frame without interfering with each other. Each mandrel can achieve independent and individual fine adjustment of its horizontal position, and can be specifically corrected according to the molding size error of a single cavity. This makes up for the technical shortcomings of traditional overall adjustment methods that cannot correct local deviations in a single cavity, and greatly improves the overall dimensional consistency of multi-cavity profile molding. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is the front view of the steel strip adjusting mandrel; Figure 4 yes Figure 3 Sectional view of AA; Figure 5 This is a schematic diagram of the adjusting block; Figure 6 This is a structural schematic diagram of the adjustment block from another perspective; Figure 7 This is a structural diagram showing the overlap of the left and right steel strips; Figure 8 This is the front view when the left steel strip (right steel strip) is unfolded; Figure 9 This is the front view of the first preform; Figure 10 This is the front view of the second preform; Figure 11 This is the front view of the third preform; Figure 12 This is a structural diagram of the finished profile; Figure 13 This is the left view of the finished profile; In the diagram: 1. Mold frame; 2. Molding mold body; 3. Mandrel; 4. Left steel strip; 5. Right steel strip; 6. Adjusting bolt; 7. Adjusting block; 8. First preforming plate; 9. Second preforming plate; 10. Third preforming plate; 11. Limiting hole; 12. Transition block; 31. Molding section; 32. Preforming section; 33. Connecting section; 41. Fixing hole; 71. Mounting groove; 72. Through hole; 81. Round hole; 82. First elongated hole; 91. Bundling hole; 92. Second elongated hole; 101. Through hole; 102. Third elongated hole; 121. Fixing block; 122. Rotating block; 123. Ball head; 124. Slot. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0024] Example 1: This invention discloses a multi-cavity composite material profile forming device for forming multi-cavity composite material profiles. For example... Figure 12 and Figure 13 As shown, the multi-cavity composite profile has a rectangular plate structure with multiple evenly spaced cavities inside. The cavities extend along the length of the profile and are spaced apart along the width of the profile.

[0025] like Figure 1 and Figure 2 As shown, the present invention includes a cuboid mold frame 1. The inlet end of the forming mold 2 is installed at one end of the mold frame 1 and fixed by bolts. A first pre-forming plate 8 perpendicular to the extension direction of the inner hole of the forming mold 2 is fixedly provided at the other end of the mold frame 1. Figure 9 As shown, the first preform plate 8 is provided with multiple sets of circular holes 81, the position of each set of circular holes 81 corresponding to the partition layer of the outer surface and inner cavity of the profile. Each set is provided with multiple circular holes 81 for multiple strands of yarn to pass through. The first preform plate 8 is also provided with multiple first elongated holes 82, including straight structures and U-shaped structures with downward openings, for felt to pass through, so that the outer and inner surfaces of the profile are made of felt, and the interior is filled with yarn. It is connected and fixed by glue and dried within the molding mold 2.

[0026] The mold frame 1 also has a second preforming plate 9 and a third preforming plate 10 arranged parallel to and spaced apart from the first preforming plate 8 along the yarn movement direction. Each of the four sides of the second preforming plate 9 and the third preforming plate 10 has threaded holes. Bolts pass through the mold frame 1 and are threaded into these holes, thus securing the second preforming plate 9 and the third preforming plate 10. This not only limits the positioning of the second preforming plate 9 and the third preforming plate 10 but also facilitates disassembly and assembly.

[0027] like Figure 10 As shown, the second preformed plate 9 is provided with a plurality of bundle holes 91, each bundle hole 91 corresponding to a set of circular holes 81, which gathers the yarn passing through each set of circular holes 81 into the corresponding bundle hole 91. The second preformed plate 9 is also provided with a plurality of second elongated holes 92, including straight structures and U-shaped structures with downward openings, for the felt to pass through.

[0028] like Figure 11 As shown, the third preform plate 10 has a rectangular through hole 101 extending horizontally in the length direction. A downward-opening, U-shaped third elongated hole 102 is provided on the upper side of the through hole 101, and a straight third elongated hole 102 is provided on the lower side of the through hole 101. The upper felt fabric passes through the upper U-shaped third elongated hole 102, and the lower felt fabric passes through the lower straight third elongated hole 102. The remaining felt fabric and yarn all pass through the through hole 101.

[0029] Both the first preforming plate 8 and the second preforming plate 9 are provided with limiting holes 11, the shape of which is similar to the cross-section of the mandrel 3, in order to limit the mandrel 3.

[0030] Multiple mandrels 3 are evenly spaced and inserted into the inner cavity of the molding mold 2. One end of the mandrel 3 extends outward from the molding mold 2, passes through the through hole 101 and the limiting hole 11 of the second preforming plate 9 in sequence, and is inserted into the limiting hole 11 of the first preforming plate 8.

[0031] Adjusting blocks 7 are also provided on both sides of the mold frame 1, and are fixed by bolts. The two ends of the adjusting blocks 7 are respectively close to the second preforming plate 9 and the third preforming plate 10. Figure 3 As shown, a long strip-shaped left steel strip 4 is provided on one side of the mold frame 1, and a long strip-shaped right steel strip 5 is provided on the other side. The left steel strip 4 and the right steel strip 5 have the same structure, and their number is the same as the number of mandrels 3. Figure 5 and Figure 6 As shown, the adjusting block 7 has an installation groove 71 opening towards the mandrel 3 in the area between the second preforming plate 9 and the third preforming plate 10, and multiple evenly spaced through holes 72 penetrating the upper and lower walls of the installation groove 71. The left steel strip 4 passes through two corresponding through holes 72 on one side of the adjusting block 7, and overlaps at both ends to form a ring structure around one side of the mandrel 3, completing the pre-tightening and applying a tensile force towards the mold frame 1 to the mandrel 3. The right steel strip 5 passes through two corresponding through holes 72 on the other side of the adjusting block 7, and overlaps at both ends to form a ring structure around the other side of the mandrel 3, completing the pre-tightening and applying a tensile force towards the other side of the mold frame 1 to the mandrel 3.

[0032] The specific structure of the overlap at both ends of the left steel strip 4 and the right steel strip 5 is as follows: Figure 7 and Figure 8 As shown, multiple fixing holes 41 are provided at intervals along the length of the steel strip. When overlapping, the fixing holes 41 at both ends are coaxially arranged, and the bolts pass through these two fixing holes 41 and are locked in place by nuts.

[0033] The adjusting block 7 has a threaded adjusting bolt 6 on its outer side, with its threaded end abutting against the area of ​​the steel strip located between the upper and lower through holes 72. By turning the adjusting bolt 6, the portion of the steel strip located between the upper and lower through holes 72 can be driven to bend inward. This not only fixes the mandrel 3 with the steel strip but also adjusts the tension of the steel strip on the mandrel 3. Furthermore, by loosening or tightening the left steel strip 4 or the right steel strip 5 on a mandrel 3, the horizontal position of the mandrel 3 can be adjusted.

[0034] When adjusting bolt 6 is tightened, relative slippage will occur between the threaded end of adjusting bolt 6 and the steel strip, causing the steel strip to wear and break. Therefore, if... Figure 4 As shown, the threaded end of the adjusting bolt 6 is connected to a transition block 12. When the adjusting bolt 6 rotates, the transition block 12 does not rotate. The transition block 12 consists of a fixed block 121 and a rotating block 122. One end of the rotating block 122 is threadedly connected and fixed to the adjusting bolt 6, and the other end of the rotating block 122 is provided with a ball head 123. One end of the fixed block 121 is provided with a groove 124 for engaging the ball head 123, allowing the fixed block 121 and the rotating block 122 to rotate omnidirectionally. The other end of the fixed block 121 abuts against the steel strip, keeping it relatively stationary with respect to the steel strip.

[0035] Because the yarn and felt need to pass through the steel belt, there is a risk that the steel belt's inner cavity may be insufficient, causing the yarn or felt to come into contact with the steel belt and be cut or torn. Therefore, if Figure 4 As shown, the vertical dimension of the adjusting block 7 is larger than that of the mandrel 3, causing the upper and lower sides of the left steel strip 4 and the right steel strip 5 to form an outwardly opening wedge-shaped structure. The part of the steel strip near the mandrel 3 opens up in both the upper and lower directions to increase the space for the yarn and felt to pass through the steel strip.

[0036] In the pultrusion process, yarn and felt need to be smoothly and steadily introduced from outside the molding die and wrapped around the mandrel 3 before finally entering the narrow molding cavity. If the cross-sectional area of ​​the mandrel 3 remains unchanged from the outside to the inside, the dense fiber bundles are prone to congestion, folding, and crossing when they reach the narrow gap between the surface of the mandrel 3 and the inner wall of the mold cavity, resulting in disordered fiber arrangement and uneven stress. Therefore, in this embodiment, the part of the mandrel 3 located inside the molding die 2 is defined as the molding section 31, and the part located outside the molding die 2 is defined as the pre-forming section 32. The end cross-sectional area of ​​the pre-forming section 32 is smaller than that of the end cross-sectional area of ​​the molding section 31, thus reserving the necessary space for fiber passage and preliminary forming, realizing the active guidance and orderly compression of the fiber material, thereby solving the problems of fiber compression and disordered arrangement.

[0037] The forming section 31 and the pre-forming section 32 are connected by a connecting section 33, which is located between the second pre-forming plate 9 and the third pre-forming plate 10, and close to the third pre-forming plate 10. The top view projection of the connecting sections 33 on both sides is a right-angled trapezoid, with the inclined surface on the inside; the top view projection of the connecting sections 33 in the middle and other positions is an isosceles trapezoid. The inclined surface design of the connecting section 33 can guide the fiber yarn to transition smoothly before entering the forming section 31, avoiding sharp bending or accumulation of the yarn at the connection of the mandrel 3. In particular, the inward-facing right-angled trapezoidal inclined surfaces on both sides can guide the yarn in the edge cavity more smoothly inward, reduce the yarn tension concentration in the edge area, and thus improve the uniformity of fiber distribution across the entire profile cross-section.

[0038] Compared to existing technologies, the advantages of this embodiment are: 1. In this invention, each mandrel 3 is independently equipped with a corresponding left steel strip 4, right steel strip 5, and adjusting bolt 6. By turning the corresponding adjusting bolt 6, the steel strip is pressed to produce deformation, precisely changing the horizontal tension of the steel strip on the mandrel 3, thereby adjusting the horizontal position of a single mandrel 3 individually. Compared to the complex assembly and alignment operations of traditional rigid set screw adjustment structures, this invention only requires simple rotation of the adjusting bolt 6 to complete the position correction of the mandrel 3, making the adjustment operation process simple. 2. This invention uses an annular steel strip to replace the traditional rigid adjustment support. The steel strip is a thin and flexible structure, occupying very little installation space. There is no need to reserve a large installation area on the outside of the mold, nor is it necessary to extend the mandrel 3 excessively to complete the independent adjustment of a single mandrel 3. This effectively solves the problem of large space occupation in traditional rigid adjustment structures, significantly shortening the overall design length of each mandrel 3. Moreover, the more cavities there are, the more prominent the effect of space optimization and shortening the length of the mandrel 3 becomes. 3. This invention effectively shortens the overall length of the mandrel 3, significantly reducing the downward deflection caused by the mandrel 3's own weight. Simultaneously, the shortened mandrel 3 exhibits greater overall rigidity, preventing the skewing and continuous shaking issues common with traditional long mandrels 3 under the lateral tension generated by continuous yarn traction. The mandrel 3's installation position within the molding die 2 is more fixed, and its posture is more stable, completely resolving the problem of uneven wall thickness on all four sides of each cavity caused by mandrel 3 deformation and shaking. This improves the dimensional accuracy of multi-cavity profile molding, effectively reducing the product dimensional deviation scrap rate and ensuring the stability of product quality in mass production. 4. The steel strips used to adjust the horizontal position of the mandrel 3 in this invention are small in size and simple in structure. Multiple sets of steel strips and matching adjusting bolts 6 can be densely arranged on both sides of the die frame 1 without interference between them. Each mandrel 3 can achieve independent and individual horizontal position fine-tuning, enabling targeted correction based on the molding dimensional error of a single cavity. This overcomes the technical shortcomings of traditional overall adjustment methods that cannot correct local deviations in a single cavity, significantly improving the overall dimensional consistency of multi-cavity profile molding.

[0039] Example 2: This invention discloses an assembly method for a multi-cavity composite material profile forming device as claimed in claims 1, employing the multi-cavity composite material profile forming device of embodiment 1, comprising the following steps: S1. Fix the molding mold 2 to one end of the mold frame 1; S2. Install the second preformed plate 9 and the third preformed plate 10 onto the mold frame 1; S3. Insert the mandrel 3 from the outlet end of the molding mold body 2 until the pre-forming section 32 is inserted into the limiting hole 11 of the first pre-forming plate 8. S4. Manually adjust the position of the mandrel 3 inside the molding mold 2 so that the mandrel 3 is close to the preset position; S5. Install the adjusting blocks 7 on both sides of the mold frame 1; S6. Connect the adjusting bolt 6 to the adjusting block 7 from the outside to the inside thread; S7. Wrap the left steel strip 4 and the right steel strip 5 around the mandrel 3 in sequence, pass them through the through hole 72, and then overlap the two ends to achieve pre-tightening of the mandrel 3. S8. Tighten the adjusting bolt 6 so that its threaded end abuts against the outside of the left steel strip 4 or the right steel strip 5; S9. Continue to tighten the adjusting bolt 6 located on one side of the mold frame 1 to adjust the mandrel 3 to the preset position; S10. Tighten the adjusting bolt 6 located on the other side of the mold frame 1 to lock and fix the core rod 3.

[0040] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A multi-cavity composite material profile molding device, comprising a mold frame (1), one end of which is fixedly connected to a molding mold body (2), wherein a plurality of evenly distributed and spaced mandrels (3) are inserted into the inner cavity of the molding mold body (2), characterized in that: The mold frame (1) has multiple annular left steel strips (4) on one side. One end of each left steel strip (4) is wrapped around one side of a core rod (3) to apply horizontal tension to the core rod (3). On the other side of the mold frame (1), there are multiple annular right steel strips (5), and the right steel strips (5) are respectively wrapped around the other side of a mandrel (3) to apply horizontal tension to the mandrel (3); The left steel strip (4) and the right steel strip (5) exert opposite directions of tension on the mandrel (3); Each of the mandrels (3) is equipped with a left steel strip (4) and a right steel strip (5); The mold frame (1) is also provided with adjusting bolts (6) on both sides, which correspond one-to-one with the left steel strip (4) and the right steel strip (5) and are threadedly connected. The threaded end of the adjusting bolt (6) abuts against the side of the left steel strip (4) or the right steel strip (5) away from the mandrel (3). The tension and the horizontal position of the mandrel (3) are adjusted by driving the left steel strip (4) or the right steel strip (5) to deform.

2. The multi-cavity composite material profile forming device according to claim 1, characterized in that: Adjustment blocks (7) are provided on both sides of the mold frame (1); The adjusting block (7) has an installation groove (71) that opens toward the core rod (3); The adjusting block (7) is also provided with a through hole (72) that runs through the upper and lower walls of the mounting groove (71). The left steel strip (4) or the right steel strip (5) is inserted into the perforation (72) on the side away from the mandrel (3).

3. The multi-cavity composite material profile forming device according to claim 2, characterized in that: The left steel strip (4) and the right steel strip (5) are both sheet-shaped and each has multiple fixing holes (41). The two ends of the left steel strip (4) or the right steel strip (5) overlap to form a ring structure, and the overlap is connected and fixed by fasteners inserted into the two fixing holes (41).

4. The multi-cavity composite material profile forming device according to claim 2, characterized in that: The vertical dimension of the adjusting block (7) is greater than that of the mandrel (3), so that the upper and lower sides of the left steel strip (4) and the right steel strip (5) form an outwardly opening wedge structure.

5. The multi-cavity composite material profile forming device according to claim 2, characterized in that: The mold frame (1) is also provided with a first preforming plate (8), a second preforming plate (9) and a third preforming plate (10) arranged at intervals along the length direction of the mandrel (3). The yarn and felt pass through the first preforming plate (8), the second preforming plate (9) and the third preforming plate (10) in sequence and then enter the molding cavity inside the molding mold (2); Both the first preform plate (8) and the second preform plate (9) have limiting holes (11); the shape of the limiting holes (11) is similar to the cross-sectional shape of the mandrel (3).

6. The multi-cavity composite material profile forming device according to claim 5, characterized in that: The portion of the mandrel (3) located inside the molding mold (2) is defined as the molding section (31), and the portion located outside the molding mold (2) is defined as the pre-molding section (32); the end cross-sectional area of ​​the pre-molding section (32) is smaller than the end cross-sectional area of ​​the molding section (31).

7. The multi-cavity composite material profile forming device according to claim 6, characterized in that: The forming section (31) and the pre-forming section (32) are connected by a connecting section (33); the top view projection of the connecting section (33) located on both sides is a right trapezoid, and the inclined surface is located on the inside; the top view projection of the connecting section (33) located in the middle and other positions is an isosceles trapezoid.

8. The multi-cavity composite material profile forming device according to claim 6, characterized in that: The left steel strip (4) and the right steel strip (5) are located between the second preformed plate (9) and the third preformed plate (10) and are wound around the preformed section (32).

9. The multi-cavity composite material profile forming device according to claim 5, characterized in that: The first preformed plate (8) is fixedly connected to the end of the mold frame (1); the edges of the second preformed plate (9) and the third preformed plate (10) are fixedly connected to the mold frame (1) by bolts.

10. An assembly method for a multi-cavity composite material profile forming device, characterized in that, The multi-cavity composite material profile forming device according to claim 6 includes the following steps: S1. Fix the molding mold (2) to one end of the mold frame (1); S2. Install the second preformed plate (9) and the third preformed plate (10) on the mold frame (1); S3. Insert the mandrel (3) from the outlet end of the molding body (2) until the preformed section (32) is inserted into the limiting hole (11) of the first preformed plate (8); S4. Manually adjust the position of the mandrel (3) within the molding mold (2) so that the mandrel (3) is close to the preset position; S5. Install the adjusting block (7) on both sides of the mold frame (1); S6. Connect the adjusting bolt (6) to the adjusting block (7) from the outside to the inside thread; S7. The left steel strip (4) and the right steel strip (5) are wrapped around the mandrel (3) in sequence, passed through the through hole (72), and then the two ends are overlapped to achieve pre-tightening of the mandrel (3); S8. Tighten the adjusting bolt (6) so that its threaded end abuts against the outside of the left steel strip (4) or the right steel strip (5); S9. Continue to tighten the adjusting bolt (6) located on one side of the mold frame (1) to adjust the mandrel (3) to the preset position; S10. Tighten the adjusting bolt (6) located on the other side of the mold frame (1) to lock and fix the mandrel (3).

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