Device and method for producing composite pultrusion pipe with complex molded surface inner wall

Abstract

The invention relates to the technical field of composite material pultrusion, in particular to a device and method for producing a composite material pultrusion pipe with a complex molded surface inner wall, and the device comprises a yarn splitting plate, a glue groove, a pre-forming plate, a forming mold, a rear pre-forming plate, a traction machine and a cutting machine which are arranged in sequence; the yarn splitting plate is used for splitting and finishing continuous fibers; the glue tank is used for impregnating fibers by using resin glue liquid; the pre-forming plate is used for collecting fibers; the rear pre-forming plate is used for carrying out secondary bundling on the fibers; the forming mold is used for shaping and heating fibers between the pre-forming plate and the rear pre-forming plate; the traction machine is used for pulling the fibers penetrating out of the forming mold; the cutting machine is used for cutting the heated and cured fibers; the post-preforming plate is introduced into the pultrusion process and is matched with the preforming plate to correct the fiber trend, so that the distribution of continuous fibers is more matched with the shape and the wall thickness of a product, and the quality and the performance of the product are improved.

Description

Technical Field

[0001] The invention relates to the technical field of cavity composite material pultrusion molding, and in particular to a device and a method for producing a composite material pultrusion tube with a complex profile inner wall. Background Art

[0002] With the widespread application of pultrusion technology, market demanders and designers are increasingly inclined to hollow composite pultruded profile structures for reasons such as product weight reduction and material waste reduction. As a result, the cross-sections of composite pultruded profiles are becoming more and more complex, and the cavity forms are diversified. In addition, since the cavity structure of pultruded cavity composite materials is controlled by a core rod, and the core rods of general cavity pultruded profiles are connected to the mold frame with bolts, it is more difficult to control the wall thickness of the cavity pultruded profile.

[0003] For commonly used cavity-type pultruded products, a common method used in the production process is to pass the fibers through the preformed plate and then heat and cure them in a molding die. During this process, since the fibers are only converged and limited on one side of the preformed plate, and there is no control on the other side, the fibers are prone to twisting and deflection on the inside of the molding die during the curing process, resulting in the resin being unable to fill the molding cavity of the molding die under the guidance of the fibers, causing problems such as uneven wall thickness of the cavity pultruded tube and even lack of glue, resulting in high rework and scrap rates.

[0004] Therefore, in view of the above problems, the present invention urgently needs to provide a device and method for producing a composite material pultruded tube with a complex inner wall. Summary of the invention

[0005] The technical problem solved by the present invention is to provide an apparatus and method for producing a composite material pultruded tube with a complex inner wall profile. The present invention introduces a rear preformed plate to perform secondary shaping on the continuous fibers and then uses a forming mold for heating and curing, thereby avoiding twisting of the continuous fibers during the forming process, which would result in difficulty in controlling the thickness of the vertical ribs of the pultruded product with a complex inner wall profile, while taking into account the convenience of process operation.

[0006] The present invention provides a device for producing a composite material pultruded tube with a complex inner surface, comprising a yarn separation plate, a glue groove, a preformed plate, a forming die, a post-preformed plate, a traction machine and a cutting machine which are sequentially arranged at intervals;

[0007] Among them, the yarn separation plate is used to separate and sort the continuous fibers;

[0008] A glue tank, used for fully impregnating the continuous fibers from the yarn separation plate with resin glue;

[0009] A preformed plate, used to converge the continuous fibers from the glue tank into a desired shape;

[0010] The post-preforming plate is used to perform secondary convergence of the continuous fibers passing through the forming die into a desired shape;

[0011] A forming die located between the preformed plate and the post-preformed plate, used to shape and heat the continuous fibers between the preformed plate and the post-preformed plate;

[0012] A traction machine, used to pull the continuous fibers passing through the forming die;

[0013] A cutting machine, used for cutting the continuous fibers after heating and curing;

[0014] The rear preformed plate includes a rear preformed plate body, the front and rear sides of the rear preformed plate body are symmetrically provided with cavity distribution surfaces, the front and rear sides of the rear preformed plate body are alternately provided with a plurality of rear preformed cavities horizontally penetrating the rear preformed plate body, and the rear preformed cavities are evenly arranged in the cavity distribution surface;

[0015] The forming mold comprises a forming template, and the front and rear sides of the forming template are horizontally penetrated with forming cavities.

[0016] Preferably, it also includes a yarn pressing roller, both ends of which are rotatably connected to the glue groove through a connecting rod, and the continuous fiber passes through between the yarn pressing roller and the glue groove.

[0017] Preferably, the area of ​​the cavity distribution surface is 1.1 to 1.2 times the cross-sectional area of ​​the forming cavity; the edges of the rear preforming cavity in contact with the front and rear end surfaces of the rear preforming plate are both provided with chamfers or rounded corners.

[0018] Preferably, the yarn splitting plate comprises a yarn splitting plate body, and a plurality of yarn splitting holes are horizontally penetrated on the front and rear sides of the yarn splitting plate body; the preformed plate comprises a preformed plate body, and a plurality of preformed holes are horizontally penetrated on the front and rear sides of the preformed plate body.

[0019] Preferably, it also includes a core rod, which is sequentially installed in the yarn separation hole, the preforming hole, the forming cavity, the post-preforming cavity and the traction machine.

[0020] Preferably, the material of the post-preformed plate is one of a laminated epoxy glass fiber reinforced plastic plate, a polytetrafluoroethylene plate and an iron plate.

[0021] Preferably, the thickness of the rear preformed plate is 10 mm.

[0022] Preferably, the upper, lower, left and right surfaces of the forming template are all covered with heating plates.

[0023] The present invention also provides a method for producing a composite material pultruded tube having an inner wall with a complex profile, comprising the following steps:

[0024] A device for preparing and producing composite pultruded tubes with complex inner wall profiles;

[0025] The continuous fibers are drawn out from the yarn group and passed through the yarn separation plate for yarn separation and finishing;

[0026] The continuous fibers after yarn separation and finishing pass through the top of the glue groove and then through the preformed plate for bundling;

[0027] passing continuous fibers from a preformed sheet through a forming cavity of a forming die;

[0028] The continuous fibers from the forming die are respectively passed through the post-preforming cavities of the post-preforming plate for secondary convergence;

[0029] Use glue tank to dip continuous fibers into glue;

[0030] Using a haul-off machine to haul off the continuous fiber;

[0031] Using a molding die to heat and solidify the continuous fibers and the resin glue in the molding cavity;

[0032] After using a cutting machine to cut off the unimpregnated continuous fibers and remove the post-preformed plate, the heated and cured continuous fibers are cut according to a set length to obtain a composite pultruded tube with a complex inner wall.

[0033] Preferably, the cross-sectional area of ​​the post-preforming cavity is 1.1 to 1.2 times the cross-sectional area of ​​the forming cavity of the forming die.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention provides a device and method for producing a composite material pultruded tube with a complex inner wall. A post-preforming plate is added to a common pultrusion process, and the path of the continuous fiber is corrected in conjunction with the preforming plate, so that the continuous fiber is evenly distributed in the forming mold according to the cavity cross-section, so that the distribution of the continuous fiber is more consistent with the product shape and wall thickness, thereby improving the quality and performance of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 1 is a schematic diagram of a first working state of a device for producing a composite material pultruded tube having an inner wall with a complex profile according to an embodiment of the present invention;

[0037] Figure 2 2 is a schematic diagram of a second working state of the device for producing a composite material pultruded tube having an inner wall with a complex profile according to an embodiment of the present invention;

[0038] Figure 3 is a flow chart of a method for producing a composite pultruded tube having an inner wall with a complex profile according to an embodiment of the present invention;

[0039] Figure 4It is a structural schematic diagram (stereoscopic diagram) of a preformed plate and a forming mold according to an embodiment of the present invention;

[0040] Figure 5 It is a structural schematic diagram (stereoscopic diagram) of a rear preformed plate according to an embodiment of the present invention;

[0041] Figure 6 It is a structural schematic diagram (stereoscopic diagram) of a composite material pultruded tube having an inner wall with a complex profile according to an embodiment of the present invention.

[0042] Among them: 1. yarn separation plate; 101. yarn separation plate body; 102. yarn separation hole; 2. glue groove; 3. preformed plate; 301. preformed plate body; 302. preformed hole; 4. forming mold; 401. forming template; 402. forming cavity; 403. heating plate; 5. post-preformed plate; 501. post-preformed plate body; 502. post-preformed cavity; 6. traction machine; 7. cutting machine; 8. yarn pressing roller; 9. core rod; 10. yarn ball; 11. pultrusion tube. DETAILED DESCRIPTION

[0043] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, this embodiment provides a device for producing a composite pultruded tube with a complex inner wall, characterized in that it includes a yarn separation plate 1, a glue groove 2, a preformed plate 3, a forming mold 4, a post-preformed plate 5, a traction machine 6 and a cutting machine 7 which are arranged in sequence;

[0045] Among them, the yarn separation plate 1 is used to separate and sort the continuous fibers;

[0046] The glue tank 2 is used to fully impregnate the continuous fibers from the yarn separation plate 1 with resin glue;

[0047] The preformed plate 3 is used to converge the continuous fibers from the glue tank 2 into a desired shape;

[0048] The post-preforming plate 5 is used to perform secondary convergence of the continuous fibers passing through the forming die 4 according to the desired shape;

[0049] The forming die 4 located between the preformed plate 3 and the rear preformed plate 5 is used to shape and heat the continuous fibers between the preformed plate 3 and the rear preformed plate 5;

[0050] A traction machine 6, used for traction of the continuous fibers passing through the forming die 4;

[0051] A cutting machine 7, used for cutting the continuous fibers after heating and curing;

[0052] The rear preformed plate 5 includes a rear preformed plate body 501, and the front and rear sides of the rear preformed plate body 501 are symmetrically provided with cavity distribution surfaces, and the front and rear sides of the rear preformed plate body 501 are alternately provided with a plurality of rear preformed cavities 502 horizontally penetrating the rear preformed plate body 501, and the rear preformed cavities 502 are evenly arranged in the cavity distribution surface;

[0053] The forming mold 4 includes a forming template 401 , and a forming cavity 402 is horizontally provided through the front and rear sides of the forming template 401 .

[0054] Among them, in the first working state, after the continuous fiber passes through the yarn dividing plate 1, it passes through the top of the glue groove 2, the preforming plate 3, the forming mold 4 and the rear preforming plate 5 in sequence; in the second working state, after the continuous fiber passes through the yarn dividing plate 1, it is pressed into the glue groove 2 by the yarn pressing roller 8 for immersion in glue, and then passes through the preforming plate 3 and the forming mold 4 in sequence, and continues to move forward under the action of the traction machine 6 until it is cut by the cutting machine 7 according to the required length.

[0055] The present invention provides a device for producing a composite pultruded tube with a complex inner wall. A post-preforming plate 5 is added to a conventional pultrusion process, and the path of the continuous fiber is corrected in cooperation with the preforming plate 3, so that the continuous fiber is evenly distributed in the forming mold 4 according to the cross-section of the forming cavity 402, so that the distribution of the continuous fiber is more consistent with the product shape and wall thickness, thereby improving the quality and performance of the final product.

[0056] In the present invention, the fiber orientation in the molding die 4 is corrected by relatively arranged rear preforming plates 5 and preforming plates 3, so that the continuous fibers are evenly distributed inside the molding die 4, and the resin glue attached to the continuous fibers evenly covers the molding gap in the molding cavity 402, thereby avoiding problems such as uneven wall thickness or even lack of glue of the pultruded tube body after heating and curing; at the same time, since the core rod 9 is only fixed at one end of the molding template 401, the far end of the core rod 9 will cause a certain degree of deviation due to gravity, resulting in uneven thickness of the side wall of the obtained pultruded tube 11, and the continuous fibers and the resin glue are gradually cured in the molding cavity 402 under the action of the heating plate 403, and the far end of the core rod 9 can be lifted to a certain extent under the guidance of the continuous fibers, reducing the influence of the bending of the core rod 9 on the wall thickness of the pultruded tube 11.

[0057] like Figure 1 , Figure 2As shown, it also includes a yarn pressing roller 8, both ends of which are rotatably connected to the glue groove 2 through a connecting rod, and the continuous fiber passes through between the yarn pressing roller 8 and the glue groove 2.

[0058] like Figure 1 , Figure 2 , Figure 4 As shown, the upper, lower, left and right surfaces of the forming template 401 are all covered with heating plates 403 .

[0059] In the present invention, the connecting rod is rotatably connected to the glue groove 2 through a rotating motor, the rotating motor is electrically connected to the controller, and the controller is electrically connected to each heating plate 403; during the use of the present invention, after the continuous fiber starts from the yarn ball 10, it passes through the yarn dividing plate 1, the gap between the glue groove 2 and the yarn pressing roller 8, the preforming plate 3, the forming mold 4 and the post-preforming plate 5 in sequence, and then the rotating motor is started first to press the continuous fiber into the glue groove 2, and the rotating motor sends a signal to the controller, and the controller receives the signal and controls the opening of each heating plate 403 to heat and cure the continuous fiber with glue, thereby obtaining a composite material pultruded tube with a complex inner wall.

[0060] like Figure 5 As shown, the area of ​​the cavity distribution surface is 1.1 to 1.2 times the cross-sectional area of ​​the forming cavity 402; the edges of the rear preforming cavity 502 that contact the front and rear end surfaces of the rear preforming plate 5 are both provided with chamfers or rounded corners.

[0061] like Figure 1 , Figure 2 , Figure 4 As shown, the yarn splitting plate 1 includes a yarn splitting plate body 101, and a plurality of yarn splitting holes 102 are horizontally penetrated on the front and rear sides of the yarn splitting plate body 101; the preformed plate 3 includes a preformed plate body 301, and a plurality of preformed holes 302 are horizontally penetrated on the front and rear sides of the preformed plate body 301.

[0062] like Figure 1 , Figure 2 As shown, it also includes a core rod 9, which is sequentially installed in the yarn separation hole 102, the preforming hole 302, the forming cavity 402, the post-preforming cavity 502 and the traction machine 6; the core rod 9 is used to cooperate with the forming cavity 402 to shape the continuous fiber with glue.

[0063] In this embodiment, the core rod 9 is fixed to one end of the forming mold 4 close to the preformed plate 3, and the other end extends into the forming cavity 402. The outer surface of the core rod 9 and the inner wall of the forming cavity 402 form a forming gap for forming a composite material pultruded tube with a complex inner wall.

[0064] In this embodiment, the material of the post-preformed plate 5 is one of a laminated epoxy glass fiber reinforced plastic plate, a polytetrafluoroethylene plate and an iron plate.

[0065] In this embodiment, the thickness of the rear preformed plate 5 is 10 mm.

[0066] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the present invention provides a method for producing a composite pultruded tube with a complex inner wall, characterized in that it comprises the following steps:

[0067] A device for preparing and producing composite pultruded tubes with complex inner wall profiles;

[0068] The continuous fibers are drawn out from the yarn group 10 and passed through the yarn separation plate 1 for yarn separation and finishing;

[0069] The continuous fibers after yarn separation and finishing pass through the top of the glue groove 2 and then pass through the preformed plate 3 for bundling;

[0070] Passing continuous fibers from the preformed sheet 3 through the forming cavity 402 of the forming die 4;

[0071] The continuous fibers from the forming die 4 are respectively passed through the post-preforming cavities 502 of the post-preforming plate 5 for secondary convergence;

[0072] Use glue tank 2 to dip the continuous fiber into glue;

[0073] Drawing the continuous fiber using a drawing machine 6;

[0074] The continuous fibers and the resin glue in the molding cavity 402 are heated and solidified using the molding mold 4;

[0075] After the unimpregnated continuous fibers are cut off by the cutting machine 7 and the post-preformed plate 5 is removed, the heated and cured continuous fibers are cut according to a set length to obtain a composite pultruded tube 11 with a complex inner wall.

[0076] The present invention provides a method for producing a composite pultruded tube with a complex inner wall. A post-preforming plate 5 is added to a conventional pultrusion process, and the path of the continuous fiber is corrected in cooperation with the preforming plate 3, so that the continuous fiber is evenly distributed in the molding die 4 according to the cross-section of the molding cavity 402, so that the distribution of the continuous fiber is more consistent with the product shape and wall thickness, thereby improving the quality and performance of the final product.

[0077] In the present invention, the fiber orientation in the molding die 4 is corrected by relatively arranged rear preforming plates 5 and preforming plates 3, so that the continuous fibers are evenly distributed inside the molding die 4, and the resin glue attached to the continuous fibers evenly covers the molding gap in the molding cavity 402, thereby avoiding problems such as uneven wall thickness or even lack of glue of the pultruded tube body after heating and curing; at the same time, since the core rod 9 is only fixed at one end of the molding template 401, the far end of the core rod 9 will cause a certain degree of deviation due to gravity, resulting in uneven thickness of the side wall of the obtained pultruded tube 11, and the continuous fibers and the resin glue are gradually cured in the molding cavity 402 under the action of the heating plate 403, and the far end of the core rod 9 can be lifted to a certain extent under the guidance of the continuous fibers, reducing the influence of the bending of the core rod 9 on the wall thickness of the pultruded tube 11.

[0078] In this embodiment, the cross-sectional area of ​​the rear preforming cavity 502 is 1.1 to 1.2 times the cross-sectional area of ​​the forming cavity 402 of the forming mold 4 .

[0079] The present invention also provides an embodiment, a method for producing a composite pultruded tube having a complex inner wall comprises the following steps:

[0080] 1) Prepare the device for producing composite material pultruded tube with complex inner wall of the present invention; comprising a yarn dividing plate 1, a glue groove 2, a preforming plate 3, a forming mold 4, a rear preforming plate 5, a tractor 6 and a cutting machine 7 which are arranged in sequence; the rear preforming plate 5 comprises a rear preforming plate body 501, the front and rear sides of the rear preforming plate body 501 are symmetrically provided with cavity distribution surfaces, the front and rear sides of the rear preforming plate body 501 are spaced apart with a plurality of rear preforming cavities 502 which horizontally penetrate the rear preforming plate body 501, and each rear preforming cavity 502 is evenly arranged in the cavity distribution surface; the forming mold 4 comprises a forming template 401, the front and rear sides of the forming template 401 are horizontally penetrated with a forming cavity 402; wherein the area of ​​the cavity distribution surface is 1.1 to 1.2 times the cross-sectional area of ​​the forming cavity 402;

[0081] 2) The continuous fibers are drawn out from the yarn group 10 and then passed through the yarn separation plate 1 in groups for yarn separation and finishing;

[0082] 3) After the continuous fibers are separated and arranged, they pass through the gap between the yarn pressing roller 8 and the glue groove 2, and then pass through the preformed plate 3 to be bundled according to the shape of the composite material pultruded tube with a complex inner wall;

[0083] 4) passing the continuous fibers from the preformed sheet 3 through the forming cavity 402 of the forming mold 4;

[0084] 5) The continuous fibers from the forming die 4 are respectively passed through the post-preforming cavities 502 of the post-preforming plate 5 according to the distribution corresponding to the preforming plates 3 for secondary convergence;

[0085] 6) Using the yarn pressing roller 8 to press the continuous fiber into the glue tank 2, the continuous fiber is dipped in glue;

[0086] 7) Using a traction machine 6 to traction the continuous fiber to move in the direction of the yarn group 10-glue groove 2-yarn separation plate 1-preformed plate 3-forming mold 4-post-preformed plate 5, the traction speed is 0.15 m / min;

[0087] 8) Using the molding die 4 to heat and solidify the continuous fibers and the resin glue in the molding cavity 402, the heating temperature is 130° C. and 146° C.;

[0088] 9) With the traction of the traction machine 6, the solidified continuous fibers push the rear preformed board 5 to move to the front of the cutting machine 7. After the cutting machine 7 cuts off the unimpregnated continuous fibers, the rear preformed board 5 is removed and can be recycled for processing other products;

[0089] 10) After the heated and cured pultruded tube is cut into pieces according to the set length using the cutting machine 7, the following are obtained: Figure 6 A composite pultruded tube with a complex profiled inner wall is shown.

[0090] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A device for producing a composite pultruded tube with a complex inner wall, characterized in that: It comprises a yarn separation plate (1), a glue groove (2), a preforming plate (3), a forming mold (4), a post-preforming plate (5), a traction machine (6) and a cutting machine (7) which are arranged in sequence at intervals; The yarn separation plate (1) is used to separate and arrange the continuous fibers; A glue tank (2) is used to fully impregnate the continuous fibers from the yarn separation plate (1) with a resin glue solution; A preformed plate (3) is used to converge the continuous fibers from the glue tank (2) into a desired shape; A post-preforming plate (5) is used to perform secondary convergence of the continuous fibers passing through the forming die (4) into a desired shape; A forming mold (4) located between the preformed plate (3) and the post-preformed plate (5), used for shaping and heating the continuous fibers between the preformed plate (3) and the post-preformed plate (5); A traction machine (6) for traction of the continuous fibers passing through the forming die (4); A cutting machine (7), used for cutting the continuous fibers after heating and curing; The rear preformed plate (5) comprises a rear preformed plate body (501), the front and rear sides of the rear preformed plate body (501) are symmetrically provided with cavity distribution surfaces, the front and rear sides of the rear preformed plate body (501) are alternately provided with a plurality of rear preformed cavities (502) horizontally penetrating the rear preformed plate body (501), and the rear preformed cavities (502) are evenly arranged in the cavity distribution surface; The molding die (4) comprises a molding template (401), and molding cavities (402) are horizontally provided on the front and rear sides of the molding template (401).

2. The device for producing a composite pultruded tube with a complex inner wall according to claim 1, characterized in that: It also comprises a yarn pressing roller (8), the two ends of which are rotatably connected to the glue groove (2) via a connecting rod, and the continuous fibers pass through between the yarn pressing roller (8) and the glue groove (2).

3. The device for producing a composite pultruded tube with a complex inner wall according to claim 2, characterized in that: The area of ​​the cavity distribution surface is 1.1 to 1.2 times the cross-sectional area of ​​the forming cavity (402); the edges where the rear preforming cavity (502) contacts the front and rear end surfaces of the rear preforming plate (5) are both provided with chamfers or rounded corners.

4. The device for producing a composite pultruded tube with a complex inner wall according to claim 3, characterized in that: The yarn splitting plate (1) comprises a yarn splitting plate body (101), and a plurality of yarn splitting holes (102) are horizontally penetrated on the front and rear sides of the yarn splitting plate body (101); the preformed plate (3) comprises a preformed plate body (301), and a plurality of preformed holes (302) are horizontally penetrated on the front and rear sides of the preformed plate body (301).

5. The device for producing a composite pultruded tube with a complex inner wall according to claim 4, characterized in that: It also includes a core rod (9), which is sequentially installed in the yarn separation hole (102), the preforming hole (302), the forming cavity (402), the post-preforming cavity (502) and the traction machine (6).

6. The device for producing a composite pultruded tube with a complex inner wall according to claim 5, characterized in that: The material of the post-preformed plate (5) is one of a laminated epoxy glass fiber reinforced plastic plate, a polytetrafluoroethylene plate and an iron plate.

7. The device for producing a composite pultruded tube with a complex inner wall according to claim 6, characterized in that: The thickness of the rear preformed plate (5) is 10 mm.

8. The device for producing a composite pultruded tube with a complex inner wall according to claim 7, characterized in that: The upper, lower, left and right surfaces of the forming template (401) are all covered with heating plates (403).

9. A method for producing a composite pultruded tube having a complex inner wall, characterized in that: The steps include: A device for producing a composite pultruded tube having a complex inner wall as described in any one of claims 1 to 8; The continuous fibers are drawn out from the yarn group (10) and passed through a yarn separation plate (1) for yarn separation and finishing; The continuous fibers after yarn separation and arrangement are passed through the top of the glue groove (2) and then through the preformed plate (3) for bundling; Passing continuous fibers from a preformed sheet (3) through a forming cavity (402) of a forming mold (4); The continuous fibers from the forming mold (4) are respectively passed through the post-preforming cavities (502) of the post-preforming plate (5) for secondary convergence; Using a glue tank (2) to dip the continuous fibers into glue; Drawing the continuous fiber using a drawing machine (6); Using a molding die (4) to heat and solidify the continuous fibers and the resin glue in the molding cavity (402); After using a cutting machine (7) to cut off the unimpregnated continuous fibers and remove the post-preformed plate (5), the heated and cured continuous fibers are cut according to a set length to obtain a composite material pultruded tube (11) with a complex inner wall.

10. The method for producing a composite pultruded tube having a complex inner wall according to claim 9, characterized in that: The cross-sectional area of ​​the rear preforming cavity (502) is 1.1 to 1.2 times the cross-sectional area of ​​the forming cavity (402) of the forming mold (4).

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