A pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape

Abstract

The present invention discloses a pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape. The device belongs to the field of civil engineering and includes a preforming mechanism, a heating die, multiple sets of cooling and shaping dies, and a base plate. The rear end of the preforming mechanism is connected to the front end of the heating die, and the heating die is fixed to the upper plane of the front portion of the base plate. The upper plane of the rear portion of the base plate is provided with parallel slideways. Multiple sets of cooling and shaping dies are sequentially mounted in series on the parallel slideways, with the rear end of the heating die corresponding to the front end of the first set of cooling and shaping dies. The preforming mechanism, heating die, and cooling and shaping die are all equipped with heating rods and temperature sensors. The present invention can effectively avoid the phenomenon of large dimensional deviation and high porosity of pultruded profiles caused by thermal expansion during shaping at the outlet end of the heating die.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering, and in particular relates to a pultrusion device for preparing composite reinforcement by utilizing thermoplastic prepreg tape. Background Art

[0002] Continuous fiber-reinforced resin-based composite bars are lightweight, high-strength, and corrosion-resistant. Replacing steel bars in marine engineering construction effectively addresses corrosion issues, significantly improving the performance and service life of marine engineering structures, and generating significant economic benefits. Compared to thermosetting resin-based composite bars, thermoplastic resin-based composite bars offer advantages such as reproducible molding, high toughness, and excellent durability, making them more suitable for marine engineering applications.

[0003] Currently, the two-step molding method is the main method for preparing thermoplastic composite materials. The two-step molding method refers to first preparing a thermoplastic prepreg tape using fibers and resin as raw materials, and then preparing a thermoplastic composite material using the thermoplastic prepreg tape as raw material. This is because the thinner fiber bundles in the thermoplastic prepreg tape shorten the impregnation path of the resin melt, greatly reducing the difficulty of uniformly impregnating the fiber bundles with the high-viscosity thermoplastic resin melt. However, the pultrusion molding process requires the prepreg tape to be cut into narrow strips. There are cut hair fibers on both sides of the cut prepreg tape. During the continuous production process, the continuous accumulation of hair fibers can easily cause blockage and affect the surface morphology of the pultruded profile. In addition, the melting point of thermoplastic resin is relatively high. Heating the die outlet end to shape the pultruded profile will result in a high porosity and large dimensional deviation in the prepared profile. Therefore, it is urgent to propose an efficient pultrusion molding device and method for preparing composite reinforcement with low porosity, low dimensional deviation, and low surface roughness using thermoplastic prepreg tape. Summary of the Invention

[0004] Based on the above shortcomings, the present invention proposes a pultrusion molding device for preparing composite reinforcement using thermoplastic prepreg tape, aiming to solve the problems of high porosity, large dimensional deviation, high surface roughness and low production efficiency of pultruded profiles caused by existing equipment and methods.

[0005] To achieve the above-mentioned object, the technical solution of the present invention is implemented as follows: a pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape, comprising a preforming mechanism, a heating die, multiple groups of cooling and shaping dies, and a base plate, wherein the rear end of the preforming mechanism is connected to the front end of the heating die, the heating die is fixed to the upper plane of the front portion of the base plate, the upper plane of the rear portion of the base plate is provided with parallel slideways, multiple groups of the cooling and shaping dies are sequentially mounted in series on the parallel slideways, and the rear end of the heating die corresponds to the front end position of the first group of cooling and shaping dies; the preforming mechanism, heating die, and cooling and shaping die are all equipped with heating rods and temperature sensors;

[0006] The preforming mechanism includes a first preforming plate, a second preforming plate, a third preforming plate and four support rods and a rod nesting. The four support rods are parallel to each other and sequentially pass through the four corners of the first preforming plate, the second preforming plate and the third preforming plate. The three groups of preforming plates can slide freely along the four groups of support rods. The ends of the four support rods are equipped with support rod nesting.

[0007] The first preformed plate is provided with a first central yarn guide hole and four first horizontal yarn guide holes, the first central yarn guide hole and the four first horizontal yarn guide holes are arranged in the same row from top to bottom, the first central yarn guide hole is located in the middle of the four first horizontal yarn guide holes, and a group of vertical yarn guide holes are respectively provided on the left and right sides of the first central yarn guide hole;

[0008] The second preformed plate is provided with a second central yarn guide hole and two second horizontal yarn guide holes, the second central yarn guide hole and the two second horizontal yarn guide holes are arranged in the same row from top to bottom, the second central yarn guide hole is located between the two second horizontal yarn guide holes, and a group of vertical yarn guide holes are respectively provided on the left and right sides of the second central yarn guide hole.

[0009] The third preformed plate has a third central yarn guide hole at its center, and a group of vertical yarn guide holes are respectively opened on the left and right sides of the third central yarn guide hole.

[0010] The first center yarn guide hole, the second center yarn guide hole and the third center yarn guide hole are coaxial, and the distance between the center yarn guide hole and the adjacent horizontal yarn guide hole on each preformed plate gradually decreases along the pultrusion direction. The positions of the temperature sensors on the first and second preformed plates are close to the uppermost horizontal yarn guide hole, and the position of the temperature sensor on the third preformed plate is close to the third center yarn guide hole.

[0011] Furthermore, the heating mold includes a top mold and a bottom mold, and the top mold and the bottom mold are tightly fitted with each other through bolts to form an integral heating mold. The support rod is nested in the front end of the heating mold, and a through hole is opened along the axis of the heating mold. The cross-section of the through hole is conical, and the through hole is coaxial with the central horizontal yarn guide holes on the three groups of preformed plates; the position of the temperature sensors on the top mold and the bottom mold should be close to the through hole.

[0012] Furthermore, the cooling mold includes a cooling plate and a shaping wedge. The cooling plate is installed on the slide of the base plate. The cooling plate can move on the slide of the base plate. A wedge-shaped hole consistent with the shape of the shaping wedge is opened in the center of the cooling plate. The shaping wedge is embedded in the wedge-shaped hole. The shaping wedge in each group of cooling molds is coaxial with the through hole of the heating mold.

[0013] Furthermore, the thickness H of the horizontal yarn guide hole on each preformed plate 单 Should meet the following requirements:

[0014]

[0015] Where: h 带 is the thickness of thermoplastic prepreg tape, n 带 The number of prepreg tapes required to prepare thermoplastic composite reinforcement, n 孔 It is the number of yarn guide holes on the preformed plate.

[0016] Furthermore, the heating setting temperature T1 on each preformed plate should meet the following requirements:

[0017]

[0018] Where: T g is the glass transition temperature of thermoplastic resin, T m is the melting temperature of thermoplastic resin.

[0019] Furthermore, the heating setting temperature T2 of the heating mold should satisfy:

[0020] T m <T2<T d

[0021] Where: T d It is the decomposition temperature of thermoplastic resin.

[0022] Furthermore, the number of cooling molds n 冷 Should meet the following requirements:

[0023]

[0024] Where: u is the pultrusion rate, t 结晶 The time required for the thermoplastic resin to fully crystallize, L 冷 In order to cool the thickness of the cooling plate, the diameter of the inlet end of the shaping wedge should be slightly larger than the diameter of the outlet end of the wedge groove of the heating mold. The diameter of the outlet end is the diameter of the thermoplastic composite reinforcement. The position of the temperature sensor should be close to the shaping wedge and its heating temperature should be set to the temperature corresponding to the maximum crystallization rate of the thermoplastic resin.

[0025] A method for preparing thermoplastic composite reinforcement, using equipment including the pultrusion device described above, and also using an existing rib wrapping device, a rib forming oven, a rib unwinding device, and a traction device, the method steps are as follows:

[0026] Step 1, prepreg tape cutting: Cut the wide thermoplastic prepreg tape into two prepreg tape strips of different widths, wherein the width L1 of one prepreg tape strip should satisfy: L1 = d, and the width L2 of the other prepreg tape strip should satisfy: L2 = d-2, where d is the diameter of the prepared thermoplastic composite bar. The number n1 and n2 of the two prepreg tape strips should satisfy:

[0027]

[0028] The purpose of this step is to achieve a reasonable combination of two prepreg strips of different widths so that they can fully fill the pultrusion molding device and reduce the porosity of the prepared thermoplastic composite reinforcement;

[0029] Step 2: Preheating the molding device: Turn on the temperature control system of the molding device and the rib molding oven, adjust the preforming mechanism, heating mold, and cooling mold to the required temperature;

[0030] Step 3: Prepreg tape threading: First, [(n1+n2) / 5] thermoplastic prepreg tapes are sequentially passed through the central horizontal yarn guide hole on the preforming mechanism, the heating mold, the cooling mold, the rib winding device, the rib forming oven, the rib unwinding device, and the traction device. The traction device is turned on. Then, one thermoplastic prepreg tape is passed through each of the vertical yarn guide holes on both sides of the central horizontal yarn guide hole, and the remaining thermoplastic prepreg tapes are evenly passed through the remaining horizontal yarn guide holes. Finally, the temperature of the heating mold is used to melt the thermoplastic resin in the prepreg tapes, which are then attached to the prepreg tapes that have been threaded previously. Under the action of the traction device, the prepreg tapes are sequentially passed through the above devices.

[0031] Step 4: Winding and unwinding the rib material: After the thermoplastic prepreg tape is formed into a thermoplastic composite rod through a cooling mold, one end of the rib material is fixed to the surface of the thermoplastic composite rod. The rib winding device is turned on. Under the action of the traction device, the thermoplastic composite rod with the rib material on the surface enters the rib forming oven. Under the action of the oven temperature field, the rib material is squeezed into the resin on the surface of the thermoplastic composite rod. After the thermoplastic composite rod passes through the rib forming oven, the rib unwinding device is turned on to remove the rib material from the surface of the composite rod, thereby completing the rib forming.

[0032] Step 5, Winding: Under the action of the traction device, the thermoplastic composite reinforcement is wound onto the winding device. After it is produced to the specified length, the thermoplastic composite reinforcement is cut and tied into a coil;

[0033] Furthermore, in the preparation method described above, the thermoplastic resin matrix of the thermoplastic prepreg is nylon 6, nylon 12, polypropylene, polymethyl methacrylate or polyethylene, and the reinforcing fiber is continuous carbon fiber or continuous glass fiber.

[0034] Compared with the prior art, the beneficial effects and advantages of the present invention are: the heating mold of the molding device adopts an integrated structure, and the cooling mold adopts a separate structure, taking into account the advantages of high heat transfer efficiency of the integral structure and easy adjustment of the heat transfer interval length of the separate structure; the molding device shapes the pultruded profile at the cooling mold, which can effectively avoid the large size deviation and high porosity of the pultruded profile caused by thermal expansion when shaping at the outlet end of the heating mold; the molding device uses the thermoplastic prepreg in the vertical yarn guide hole to cover the two sides of the thermoplastic prepreg in the horizontal yarn guide hole (where the hair fibers are produced), which can effectively reduce the influence of hair fiber accumulation on the pultrusion process and the surface morphology of the pultruded profile; the preparation method uses thermoplastic prepreg as raw material, which solves the problem of difficulty in impregnating fiber bundles with high-viscosity thermoplastic resin melt, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural axonometric diagram of a thermoplastic composite reinforcement pultrusion molding device of the present invention;

[0036] Figure 2 is an axonometric view of three sets of preformed panels of the present invention;

[0037] Figure 3 This is a front view of the first preformed plate of the present invention;

[0038] Figure 4 A side view of a second preformed plate of the present invention;

[0039] Figure 5 A top view of a third preformed plate of the present invention;

[0040] Figure 6 This is an axonometric view of the top mold of the heating mold of the present invention;

[0041] Figure 7 This is a front view of the top mold of the heating mold of the present invention;

[0042] Figure 8 This is an axonometric view of the bottom mold of the heating mold of the present invention;

[0043] Figure 9 This is a front view of the bottom mold of the heating mold of the present invention;

[0044] Figure 10 It is an axonometric view of the cooling mold of the present invention;

[0045] Figure 11 This is a flow chart of a method for preparing thermoplastic composite reinforcement pultrusion according to the present invention;

[0046] Among them, 1. First preformed plate; 2. Second preformed plate; 3. Third preformed plate; 4-1. First center yarn guide hole; 4-2. First horizontal yarn guide hole; 4-3. Second center yarn guide hole; 4-4. Second horizontal yarn guide hole; 4-5. Third center yarn guide hole; 5. Vertical yarn guide hole; 6. Support rod; 7. Top mold; 8. Bottom mold; 9. Through hole; 10. Cooling plate; 11. Shaping wedge; 12. Slide; 13. Fixing bolt; 14. Lifting bolt; 15. Temperature sensor; 16. Heating rod; 17. Lifting bolt; 18. Bottom plate. DETAILED DESCRIPTION

[0047] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0048] Example 1

[0049] like Figures 1 to 10 As shown, a pultrusion molding device for preparing 10mm GF / PP composite reinforcement using GF / PP prepreg tape includes a preforming mechanism, a heating die, two sets of cooling and shaping dies, and a base plate. The rear end of the preforming mechanism is connected to the front end of the heating die. The heating die is fixed to the upper surface of the front portion of the base plate 18. The upper surface of the rear portion of the base plate 18 is provided with parallel slideways 12. The two sets of cooling and shaping dies are sequentially mounted in series on the parallel slideways 12. The rear end of the heating die corresponds to the front end of the first cooling and shaping die. The preforming mechanism, the heating die, and the two sets of cooling and shaping dies are all equipped with heating rods 16 and temperature sensors 15.

[0050] The preforming mechanism includes a first preforming plate 1, a second preforming plate 2, a third preforming plate 3 and four support rods 6 and a support rod nest. The four support rods 6 are parallel to each other and sequentially pass through the four vertex corners of the first preforming plate 1, the second preforming plate 2, and the third preforming plate 3. The three groups of preforming plates can slide freely along the four groups of support rods 6; the ends of the four support rods 6 are equipped with support rod nests;

[0051] The first preformed plate 1 is provided with a first central yarn guide hole 4-1 and four first horizontal yarn guide holes 4-2. The first central yarn guide hole 4-1 and the four first horizontal yarn guide holes 4-2 are arranged in the same row from top to bottom. The first central yarn guide hole 4-1 is located in the middle of the four first horizontal yarn guide holes 4-2. A group of vertical yarn guide holes 5 are respectively provided on the left and right sides of the first central yarn guide hole 4-1.

[0052] The second preformed plate 2 is provided with a second central yarn guide hole 4-3 and two second horizontal yarn guide holes 4-4. The second central yarn guide hole 4-3 and the two second horizontal yarn guide holes 4-4 are arranged in the same row from top to bottom. The second central yarn guide hole 4-3 is located between the two second horizontal yarn guide holes 4-4. A group of vertical yarn guide holes 5 are respectively provided on the left and right sides of the second central yarn guide hole 4-4.

[0053] The third preformed plate 3 has a third central yarn guide hole 4-5 in the center, and a group of vertical yarn guide holes 5 are respectively opened on the left and right sides of the third central yarn guide hole 4-5.

[0054] The first center yarn guide hole 4-1, the second center yarn guide hole 4-3 and the third center yarn guide hole 4-5 are coaxial. The cross-section of all yarn guide holes (including horizontal, center and vertical yarn guide holes) is rectangular, and the inner surface should be smooth and flat with rounded corners.

[0055] All horizontal yarn guide holes have an opening width of 12mm; all vertical yarn guide holes have an opening width of 3mm and an opening height of 12mm. The opening heights of the first central yarn guide hole 4-1 and the four first horizontal yarn guide holes 4-2 are 3mm, the opening heights of the second central yarn guide hole 4-3 and the two second horizontal yarn guide holes 4-4 are 6mm, and the opening height of the third central yarn guide hole 4-5 is 12mm. The spacing between the central yarn guide hole and the adjacent horizontal yarn guide holes on each preform plate gradually decreases along the pultrusion direction. The temperature sensor 15 on each preform plate should be located close to the upper side of the uppermost horizontal yarn guide hole, and the heating temperature should be set to 150°C.

[0056] The heating mold includes a top mold 7 and a bottom mold 8. The top mold 7 and the bottom mold 8 are tightly fitted together by multiple groups of bolts to form an integral heating mold. The spacing between adjacent bolts should not be greater than 100 mm. The support rod is nested in the front end of the heating mold, and a through hole 9 is opened along the axis of the heating mold. The cross-section of the through hole 9 is conical, and the through hole 9 is coaxial with the central horizontal yarn guide holes on the three groups of preformed plates; the length of the heating mold is 500 mm; the inlet and outlet diameters of the through hole 9 are 13 mm and 11 mm respectively; the position of the temperature sensor on the top mold 7 and the bottom mold 8 should be close to the through hole 9, and the heating temperature is set to 240°C.

[0057] Each set of cooling molds includes a cooling plate 10 and a shaping wedge 11. The cooling plate 10 is mounted on a slideway 12 on a base plate 18 and is movable on the slideway 12. A wedge-shaped hole, identical in shape to the shaping wedge, is defined in the center of the cooling plate 10. The shaping wedge 11 is inserted into the hole. The shaping wedge 11 on each cooling mold set is coaxial with the through-hole 9 of the heating mold. The inlet and outlet diameters of the shaping wedge 11 are 12 mm and 10 mm, respectively. The temperature sensor 15 should be located close to the shaping wedge, and the heating temperature should be set to 130°C.

[0058] Example 2

[0059] like Figure 11 As shown, this embodiment provides a method for preparing GF / PP composite reinforcement, the equipment used includes the pultrusion molding device as described in Example 1, and also includes an existing rib wrapping device, a rib molding oven, a rib unwinding device and a traction device, and the method steps are as follows:

[0060] Step 1: Prepreg tape cutting: Cut a GF / PP prepreg tape with a width of 150 mm and a thickness of 0.3 mm into two prepreg tape strips of different widths. The widths of the two prepreg tape strips are 8 mm and 10 mm, respectively. The number of 8 mm and 10 mm prepreg tape strips is 15 and 14, respectively.

[0061] Step 2, preheating the forming device and the rib forming oven: Turn on the temperature control system of the forming device and the rib forming oven of Example 1, and adjust the temperatures of the preforming mechanism, heating mold, cooling mold and rib forming oven to 150°C, 240°C, 130°C and 150°C, respectively.

[0062] Step 3: Prepreg through the mold: Pass the prepreg through the central yarn guide hole and horizontal yarn guide hole on the preforming mechanism, the heating mold, the cooling mold, the rib winding device, the rib forming oven, the rib unwinding device, and the traction device in sequence according to the arrangement shown in the table below. Turn on the traction device and allow the prepreg to pass through the above devices in sequence under the action of the traction device;

[0063]

[0064] Step 4: Winding and Unwinding the Rib Material: After the GF / PP prepreg tape passes through the cooling mold to form a GF / PP composite rod, secure one end of the rib material (such as iron wire or aluminum wire) to the surface of the GF / PP composite rod, and activate the rib wrapping device. Under the action of a traction device, the GF / PP composite rod with the rib material on its surface enters the rib forming oven. Under the influence of the oven's temperature field, the rib material is squeezed into the resin on the surface of the thermoplastic composite rod. After the GF / PP composite rod passes through the rib forming oven, activate the unwinding device to remove the rib material from the composite rod surface, completing the rib formation.

[0065] Step 5: Winding: Under the action of the traction device, the GF / PP composite reinforcement is wound onto the winding device. After it is produced to the specified length, the GF / PP composite reinforcement is cut and tied into a coil.

[0066] Example 3

[0067] like Figures 1 to 10 As shown, a pultrusion device for preparing 20 mm CF / PA6 composite reinforcement using CF / PA6 prepreg tape has the same structure as that of Example 1, except that:

[0068] The opening width of all horizontal yarn guide holes is 32mm; the opening width of all vertical yarn guide holes is 5mm and the opening height is 32mm.

[0069] The opening heights of the first central yarn guide hole 4-1 and the four first horizontal yarn guide holes 4-2 are both 5 mm, the opening heights of the second central yarn guide hole 4-3 and the two second horizontal yarn guide holes 4-4 are both 10 mm, and the opening height of the third central yarn guide hole 4-5 is 20 mm.

[0070] The heating die has a length of 1000 mm and the diameters of the inlet and outlet ends of the through hole 9 are 33 mm and 22 mm respectively.

[0071] Example 4

[0072] like Figure 11 As shown, this embodiment provides a method for preparing CF / PA6 composite reinforcement bars. The equipment used includes the pultrusion molding device described in Example 3, and also includes an existing rib wrapping device, a rib molding oven, a rib unwinding device, and a pulling device. The method steps are as follows:

[0073] Step 1: Prepreg tape cutting: Cut the CF / PA6 prepreg tape with a width of 150 mm and a thickness of 0.2 mm into two prepreg tape strips of different widths. The widths of the two prepreg tape strips are 28 mm and 30 mm, respectively. The number of 28 mm and 30 mm prepreg tape strips is 25 and 29, respectively.

[0074] Step 2, preheating the forming device and the rib forming oven: Turn on the temperature control system of the forming device and the rib forming oven of Example 3, and adjust the temperatures of the preforming mechanism, heating mold, cooling mold and rib forming oven to 180°C, 280°C, 150°C and 180°C, respectively.

[0075] Step 3: Prepreg through the mold: The prepreg is passed through the central yarn guide hole and horizontal yarn guide hole on the preforming mechanism, the heating mold, the cooling mold, the rib winding device, the rib forming oven, the rib unwinding device, and the traction device in the order shown in the table below. The traction device is turned on and the prepreg is passed through the above devices in sequence under the action of the traction device;

[0076]

[0077]

[0078] Step 4: Rib Material Winding and Unwinding: After the CF / PA6 prepreg tape passes through the cooling mold to form a CF / PA6 composite rod, one end of the rib material (such as iron wire or aluminum wire) is secured to the surface of the CF / PA6 composite rod, and the rib winding device is activated. Under the action of a traction device, the CF / PA6 composite rod with the rib material on its surface enters the rib forming oven. Under the influence of the oven's temperature field, the rib material is squeezed into the resin on the thermoplastic composite rod surface. After the CF / PA6 composite rod passes through the rib forming oven, the unwinding device is activated to remove the rib material from the composite rod surface, completing the rib formation.

[0079] Step 5: Winding: Under the action of the traction device, the CF / PA6 composite reinforcement is wound onto the winding device. After it is produced to the specified length, the CF / PA6 composite reinforcement is cut and tied into a coil.

Claims

1. A pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape, comprising a preforming mechanism, a heating die, multiple sets of cooling and shaping dies, and a base plate, characterized in that: The rear end of the preforming mechanism is connected to the front end of the heating mold, the heating mold is fixed to the upper plane of the front part of the bottom plate, the upper plane of the rear part of the bottom plate is provided with parallel slides, multiple groups of cooling and shaping molds are sequentially installed in series on the parallel slides, and the rear end of the heating mold corresponds to the front end position of the first group of cooling and shaping molds; the preforming mechanism, the heating mold and the cooling and shaping mold are all equipped with heating rods and temperature sensors; The preforming mechanism includes a first preforming plate, a second preforming plate, a third preforming plate and four support rods and a support rod nesting. The four support rods are parallel to each other and sequentially pass through the four corners of the first preforming plate, the second preforming plate and the third preforming plate. The three groups of preforming plates can slide freely along the four groups of support rods. The ends of the four support rods are equipped with support rod nesting. The first preformed plate is provided with a first central yarn guide hole and four first horizontal yarn guide holes, the first central yarn guide hole and the four first horizontal yarn guide holes are arranged in the same row from top to bottom, the first central yarn guide hole is located in the middle of the four first horizontal yarn guide holes, and a group of vertical yarn guide holes are respectively provided on the left and right sides of the first central yarn guide hole; The second preformed plate is provided with a second central yarn guide hole and two second horizontal yarn guide holes, the second central yarn guide hole and the two second horizontal yarn guide holes are arranged in the same row from top to bottom, the second central yarn guide hole is located between the two second horizontal yarn guide holes, and a group of vertical yarn guide holes are respectively provided on the left and right sides of the second central yarn guide hole. The third preformed plate has a third central yarn guide hole at its center, and a group of vertical yarn guide holes are respectively opened on the left and right sides of the third central yarn guide hole. The first center yarn guide hole, the second center yarn guide hole and the third center yarn guide hole are coaxial. The first center yarn guide hole, the second center yarn guide hole and the third center yarn guide hole are coaxial. The spacing between the center yarn guide hole and the adjacent horizontal yarn guide hole on each preformed plate gradually decreases along the pultrusion direction. The positions of the temperature sensors on the first and second preformed plates are close to the uppermost horizontal yarn guide hole, and the position of the temperature sensor on the third preformed plate is close to the third center yarn guide hole.

2. The pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 1, characterized in that: The heating mold includes a top mold and a bottom mold, and the top mold and the bottom mold are tightly matched with each other through bolts to form an integral heating mold. The support rod is nested in the front end of the heating mold, and a through hole is opened along the axis of the heating mold. The cross-section of the through hole is conical, and the through hole is coaxial with the central horizontal yarn guide holes on the three groups of preformed plates; the position of the temperature sensors on the top mold and the bottom mold should be close to the through hole.

3. The pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 2, characterized in that: The cooling and shaping mold includes a cooling plate and a shaping wedge. The cooling plate is installed on the slide of the base plate. The cooling plate can move on the slide of the base plate. A wedge-shaped hole consistent with the shape of the shaping wedge is opened in the center of the cooling plate. The shaping wedge is embedded in the wedge-shaped hole. The shaping wedge in each group of cooling and shaping molds is coaxial with the through hole of the heating mold.

4. The pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 3, characterized in that: Thickness of horizontal yarn guide holes on each preformed plate Should meet the following requirements: ， in: is the thickness of the thermoplastic prepreg tape, The number of prepreg tapes required to prepare thermoplastic composite reinforcement, It is the number of yarn guide holes on the preformed plate.

5. The pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 4, characterized in that: The heating setting temperature T1 on each preformed plate should meet the following requirements: ， in: is the glass transition temperature of thermoplastic resin, is the melting temperature of thermoplastic resin.

6. The pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 5, characterized in that: The length of the heating die should meet the following requirements: the temperature at the center of the cross section of the pultruded profile reaches the melting temperature of the thermoplastic resin when the profile reaches the outlet of the heating die. The inlet and outlet diameters of the through hole should be larger than the diameter of the thermoplastic composite rib. The heating setting temperature T2 of the heating die should meet the following requirements: ， in: It is the decomposition temperature of thermoplastic resin.

7. The pultrusion device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 6, characterized in that: Number of cooling and shaping molds Should meet the following requirements: ， Where: u is the pultrusion rate, The time required for thermoplastic resin to fully crystallize. In order to cool the thickness of the cooling plate, the diameter of the inlet end of the shaping wedge should be slightly larger than the diameter of the outlet end of the wedge groove of the heating mold. The diameter of the outlet end is the diameter of the thermoplastic composite reinforcement. The position of the temperature sensor should be close to the shaping wedge and its heating temperature should be set to the temperature corresponding to the maximum crystallization rate of the thermoplastic resin.

8. A method for preparing thermoplastic composite reinforcement, the apparatus comprising the pultrusion device according to claim 6, further comprising a rib wrapping device, a rib forming oven, a rib unwinding device, and a pulling device, wherein: Here are the steps: Step 1: Cutting the prepreg tape: Cut the wide thermoplastic prepreg tape into two prepreg tape strips of different widths, one of which is Should meet the following requirements: , another prepreg with narrow width Should meet the following requirements: , where d is the diameter of the prepared thermoplastic composite bar, and the number of the two prepreg strips is and Should meet the following requirements: ， The purpose of this step is to achieve a reasonable combination of two prepreg strips of different widths so that they can fully fill the pultrusion molding device and reduce the porosity of the prepared thermoplastic composite reinforcement; Step 2: Preheating the forming device: Turn on the temperature control system of the forming device and the rib forming oven, adjust the preforming mechanism, heating mold and cooling setting mold to the required temperature; Step 3: Prepreg tape through the mold: First, The thermoplastic prepreg tape is sequentially passed through the central horizontal yarn guide hole on the preforming mechanism, the heating mold, the cooling and setting mold, the rib winding device, the rib forming oven, the rib unwinding device, and the traction device; the traction device is turned on, and then a wide strip of thermoplastic prepreg tape is passed through each of the vertical yarn guide holes on both sides of the central horizontal yarn guide hole, and the remaining thermoplastic prepreg tapes are evenly passed through the remaining horizontal yarn guide holes. Finally, the temperature of the heating mold is used to melt the thermoplastic resin in the prepreg tape, and then it is attached to the prepreg tape that has been passed through previously, and is sequentially passed through the above devices under the action of the traction device; Step 4: Winding and unwinding the rib material: After the thermoplastic prepreg tape is formed into a thermoplastic composite rod through a cooling and shaping mold, one end of the rib material is fixed to the surface of the thermoplastic composite rod. The rib winding device is turned on. Under the action of the traction device, the thermoplastic composite rod with the rib material on the surface enters the rib forming oven. Under the action of the oven temperature field, the rib material is squeezed into the resin on the surface of the thermoplastic composite rod. After the thermoplastic composite rod passes through the rib forming oven, the rib unwinding device is turned on to remove the rib material from the surface of the composite rod, thereby completing the rib forming. Step 5: Winding: Under the action of the traction device, the thermoplastic composite reinforcement is wound onto the winding device. After it is produced to the specified length, the thermoplastic composite reinforcement is cut and tied into a coil.

9. The preparation method according to claim 8, characterized in that: The thermoplastic resin matrix of the thermoplastic prepreg tape is nylon 6, nylon 12, polypropylene, polymethyl methacrylate or polyethylene.

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