Pultrusion device for preparing composite material rib by using thermoplastic prepreg tape

Abstract

The invention discloses a pultrusion device for preparing a composite rib by using a thermoplastic prepreg tape, and belongs to the field of civil engineering, the pultrusion device comprises a pre-forming mechanism, a heating mold, a plurality of groups of cooling shaping molds and a bottom plate, the rear end of the pre-forming mechanism is connected with the front end of the heating mold, the heating mold is fixed on the upper plane of the front part of the bottom plate, and the cooling shaping molds are fixed on the bottom plate. Parallel slideways are formed in the upper plane of the rear part of the bottom plate, the plurality of groups of cooling and shaping molds are sequentially connected in series and mounted on the parallel slideways, and the rear end of the heating mold corresponds to the front end of the first group of cooling and shaping molds in position; the pre-forming mechanism, the heating mold and the cooling shaping mold are each provided with a heating rod and a temperature sensor. According to the invention, the phenomena of large size deviation and high porosity of the pultrusion profile caused by thermal expansion during shaping at the outlet end of the heating mold can be effectively avoided.

Description

Technical Field

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

[0002] Continuous fiber reinforced resin-based composite bars have the characteristics of light weight, high strength, and corrosion resistance. Replacing steel bars in marine engineering construction can effectively solve the corrosion problem and greatly improve the service performance and service life of marine engineering structures, with significant economic benefits. Compared with thermosetting resin-based composite bars, thermoplastic resin-based composite bars have the advantages of repeated molding, high toughness, and good durability, which better meet the application needs of marine engineering.

[0003] At present, 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 with fibers and resins as raw materials, and then preparing a thermoplastic composite material with the thermoplastic prepreg tape as raw materials. 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 wool fibers on both sides of the cut prepreg tape. The continuous accumulation of wool fibers during continuous production 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 outlet end of the mold to shape the pultruded profile will result in a high porosity and large dimensional deviation of 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 purpose, 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 mold, multiple groups of cooling and shaping molds and a bottom plate, the rear end of the preforming mechanism is connected to the front end of the heating mold, the heating mold is fixed on the front upper plane of the bottom plate, the rear upper plane of the bottom plate is provided with parallel slideways, multiple groups of cooling and shaping molds are sequentially installed in series on the parallel slideways, 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;

[0006] The preforming mechanism comprises a first preforming plate, a second preforming plate, a third preforming plate and four support rods and rod nesting, the four support rods are parallel to each other and sequentially pass through the four vertex corners of the first preforming plate, the second preforming plate and the third preforming plate, and 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 central yarn guide hole, the second central yarn guide hole and the third central yarn guide hole are coaxial, and the spacing between the central yarn guide hole on each preformed plate and the adjacent horizontal yarn guide hole 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 central 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 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.

[0012] Furthermore, the cooling mold includes a cooling plate and a shaping wedge block. 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 block is opened in the center of the cooling plate. The shaping wedge block is embedded in the wedge-shaped hole. The shaping wedge block 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:

[0014]

[0015] Where: h 带 is the thickness of the thermoplastic prepreg tape, n 带 The number of prepreg strips 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 satisfy:

[0017]

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

[0023]

[0024] Where: u is the pultrusion rate, t 结晶 The time required for thermoplastic resin to fully crystallize, L 冷 In order to cool the plate thickness, the diameter of the inlet end of the shaping wedge block should be slightly larger than the outlet end diameter of the heating mold wedge groove, and its outlet end diameter is the diameter of the thermoplastic composite rib. The position of the temperature sensor should be close to the shaping wedge block 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 ribs, the equipment used includes the pultrusion molding device as described above, and also uses an existing rib winding device, a rib molding oven, a rib unwinding device and a traction device, and 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, wherein d is the diameter of the prepared thermoplastic composite bar, and 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: turning on the temperature control system of the molding device and the rib molding oven, adjusting the preforming mechanism, heating the mold and cooling the mold to the required temperature;

[0030] Step 3, prepreg tape passing through the mold: first, the number of thermoplastic prepreg tapes [(n1+n2) / 5] is 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 in sequence; the traction device is turned on, and 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 make the thermoplastic resin in the prepreg tape reach a molten state and then adhere to the prepreg tape that has been passed through in advance, and the prepreg tape is passed through the above devices in sequence under the action of the traction device;

[0031] Step 4, winding and unwinding of 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, and 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 on the surface of the composite rod to achieve rib forming;

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

[0033] Furthermore, in the preparation method as described above, the thermoplastic resin matrix of the thermoplastic prepreg tape 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 length of the heat transfer interval 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 wool fibers are produced), which can effectively reduce the influence of wool fiber accumulation on the pultrusion process and the surface morphology of the pultruded profile; in the preparation method, the thermoplastic prepreg is used as the raw material, which solves the problem of difficulty in impregnating the fiber bundle with the high-viscosity thermoplastic resin melt, and improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0037] Figure 3 It is a front view of a 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 It 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 It is an axonometric view of the bottom mold of the heating mold of the present invention;

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

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

[0045] Fig.11 It is a flow chart of a method for preparing thermoplastic composite reinforcement by pultrusion molding of the present invention;

[0046] Among them, 1. the first preformed plate; 2. the second preformed plate; 3. the third preformed plate; 4-1. the first central yarn guide hole; 4-2. the first horizontal yarn guide hole; 4-3. the second central yarn guide hole; 4-4. the second horizontal yarn guide hole; 4-5. the third central yarn guide hole; 5. the vertical yarn guide hole; 6. the support rod; 7. the top mold; 8. the bottom mold; 9. the through hole; 10. the cooling plate; 11. the shaping wedge block; 12. the slide; 13. the fixing bolt; 14. the lifting bolt; 15. the temperature sensor; 16. the heating rod; 17. the mold lifting bolt; 18. the bottom plate. DETAILED DESCRIPTION

[0047] The following will be combined with the 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 in the embodiments can be combined with each other without conflict, and the described embodiments 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 mold, two groups of cooling and shaping molds and a bottom plate, the rear end of the preforming mechanism is connected to the front end of the heating mold, the heating mold is fixed on the front upper plane of the bottom plate 18, the rear upper plane of the bottom plate 18 is provided with a parallel slide 12, the two groups of cooling and shaping molds are sequentially installed in series on the parallel slide 12, the rear end of the heating mold corresponds to the front end position of the first cooling and shaping mold; the preforming mechanism, the heating mold and the two groups of cooling and shaping molds are all installed with a heating rod 16 and a temperature sensor 15;

[0050] The preforming mechanism comprises a first preforming plate 1, a second preforming plate 2, a third preforming plate 3 and four support rods 6 and support rod nesting, 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, and 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 nesting;

[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, and 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, which are arranged in the same row from top to bottom, and 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 at its 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 central yarn guide hole 4-1, the second central yarn guide hole 4-3 and the third central yarn guide hole 4-5 are coaxial, and the cross-sections of all yarn guide holes (including horizontal, central and vertical yarn guide holes) are rectangular, and the inner surfaces should be smooth and flat with rounded corners.

[0055] The opening width of all horizontal yarn guide holes is 12mm; the opening width of all vertical yarn guide holes is 3mm, and the opening height is 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 preformed plate gradually decreases along the pultrusion direction. The position of the temperature sensor 15 on each preformed plate should be close to the upper side of the uppermost horizontal yarn guide hole, and the heating temperature is set to 150°C.

[0056] The heating mold comprises a top mold 7 and a bottom mold 8, and the top mold 7 and the bottom mold 8 are tightly matched with each other through 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 sensors 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 group of cooling molds includes a cooling plate 10 and a shaping wedge 11. The cooling plate 10 is installed on the slide 12 of the bottom plate 18. The cooling plate 10 can move on the slide 12 of the bottom plate 18. The center of the cooling plate 10 is provided with a wedge-shaped hole consistent with the shape of the shaping wedge. The shaping wedge 11 is embedded in the wedge-shaped hole. The shaping wedge 11 on each group of cooling molds is coaxial with the through hole 9 of the heating mold; the inlet and outlet diameters of the shaping wedge 11 are 12mm and 10mm respectively. The position of the temperature sensor 15 should be close to the shaping wedge, and the heating temperature is set to 130℃.

[0058] Example 2

[0059] like Fig.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 winding 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 the GF / PP prepreg tape with a width of 150 mm and a thickness of 0.3 mm into two prepreg tape strips with different widths, wherein the widths of the two prepreg tape strips are 8 mm and 10 mm, respectively, and the numbers of the 8 mm and 10 mm prepreg tape strips are 15 and 14, respectively.

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

[0062] Step 3, prepreg tape passing through the mold: the prepreg tape is passed through the central yarn guide hole and the 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, and the traction device is turned on, and the prepreg tape is passed through the above devices in sequence under the action of the traction device;

[0063]

[0064] Step 4, winding and unwinding of rib material: After the GF / PP prepreg tape is formed into a GF / PP composite rod through the cooling mold, one end of the rib material (such as iron wire, aluminum wire, etc.) is fixed to the surface of the GF / PP composite rod, and the rib winding device is turned on. Under the action of the traction device, the GF / PP composite rod with 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 GF / PP composite rod passes through the rib forming oven, the rib unwinding device is turned on to remove the rib material on the surface of the composite rod to achieve the rib forming.

[0065] Step 5, Reeling: Under the action of the traction device, the GF / PP composite reinforcement is wound onto the reeling device. After the reinforcement 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 molding device for preparing 20mm 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 length of the heating mold is 1000 mm. 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 Fig.11 As shown, this embodiment provides a method for preparing CF / PA6 composite ribs, the equipment used includes the pultrusion molding device as described in Example 3, and also includes an existing rib winding device, a rib molding oven, a rib unwinding device and a traction device, and 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 with different widths, wherein the widths of the two prepreg tape strips are 28 mm and 30 mm, respectively, and the numbers of 28 mm and 30 mm prepreg tape strips are 25 and 29, respectively.

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

[0075] Step 3, prepreg tape passing through the mold: the prepreg tape is passed through the central yarn guide hole and the 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, the traction device is turned on, and the prepreg tape passes through the above devices in sequence under the action of the traction device;

[0076]

[0077]

[0078] Step 4, winding and unwinding of rib material: After the CF / PA6 prepreg tape is formed into a CF / PA6 composite rod through a cooling mold, one end of the rib material (such as iron wire, aluminum wire, etc.) is fixed to the surface of the CF / PA6 composite rod, and the rib winding device is turned on. Under the action of the traction device, the CF / PA6 composite rod with 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 CF / PA6 composite rod passes through the rib forming oven, the rib unwinding device is turned on to remove the rib material on the surface of the composite rod to achieve rib forming.

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

Claims

1. A pultrusion molding device for preparing composite reinforcement using thermoplastic prepreg tape, comprising a preforming mechanism, a heating mold, multiple groups of cooling and shaping molds 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 on 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 slideways, multiple groups of cooling and shaping molds are sequentially installed in series on the parallel slideways, 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 comprises a first preforming plate, a second preforming plate, a third preforming plate and four support rods and rod nesting, the four support rods are parallel to each other and sequentially pass through the four vertex corners of the first preforming plate, the second preforming plate and the third preforming plate, and 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 on each preformed plate and the adjacent horizontal yarn guide hole 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. A pultrusion molding 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. A pultrusion molding device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 2, characterized in that: The cooling mold includes a cooling plate and a shaping wedge block. 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 block is opened in the center of the cooling plate. The shaping wedge block is embedded in the wedge-shaped hole. The shaping wedge block in each group of cooling molds is coaxial with the through hole of the heating mold.

4. A pultrusion molding device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 3, characterized in that: The thickness of the horizontal yarn guide hole on each preformed plate h 单 Should meet: Where: h 带 is the thickness of the thermoplastic prepreg tape, n 带 The number of prepreg strips required to prepare thermoplastic composite reinforcement, n 孔 It is the number of yarn guide holes on the preformed plate.

5. A pultrusion molding 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: Where: T g is the glass transition temperature of thermoplastic resin, T m It is the melting temperature of thermoplastic resin.

6. A pultrusion molding 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: when the pultruded profile reaches the outlet of the heating die, the temperature at the center of the profile cross section reaches the melting temperature of the thermoplastic resin. 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: T m <T2<T d Where: T d It is the decomposition temperature of thermoplastic resin.

7. A pultrusion molding device for preparing composite reinforcement using thermoplastic prepreg tape according to claim 6, characterized in that: Number of cooling molds n 冷 Should meet: Where: u is the pultrusion rate, t 结晶 The time required for thermoplastic resin to fully crystallize, L 冷 In order to cool the plate thickness, the diameter of the inlet end of the shaping wedge block should be slightly larger than the outlet end diameter of the heating mold wedge groove, and its outlet end diameter is the diameter of the thermoplastic composite rib. The position of the temperature sensor should be close to the shaping wedge block 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 ribs, the equipment used includes the pultrusion molding device as claimed in claim 6, and also includes a rib winding device, a rib molding oven, a rib unwinding device and a traction device, characterized in that: Here are the steps: 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, wherein d is the diameter of the prepared thermoplastic composite bar, and the number n1 and n2 of the two prepreg tape strips should satisfy: 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 molding device: turning on the temperature control system of the molding device and the rib molding oven, adjusting the preforming mechanism, heating the mold and cooling the mold to the required temperature; Step 3, prepreg tape passing through the mold: first, the number of thermoplastic prepreg tapes [(n1+n2) / 5] is 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 in sequence; the traction device is turned on, and 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 make the thermoplastic resin in the prepreg tape reach a molten state and then adhere to the prepreg tape that has been passed through in advance, and the prepreg tape is passed through the above devices in sequence under the action of the traction device; Step 4, winding and unwinding of 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, and 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 on the surface of the composite rod to achieve rib forming; Step 5, winding: Under the action of the traction device, the thermoplastic composite reinforcement is wound onto the winding device. After being produced to a 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, and the reinforcing fiber is continuous carbon fiber or continuous glass fiber.

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