Closed pultrusion mold

Abstract

The utility model discloses a closed pultrusion mold which comprises a first mold and a second mold, a pultrusion cavity of the closed pultrusion mold is formed by the first mold and the second mold in a surrounding mode, and the first mold comprises a first mold body and a glue injection part. The glue injection part is communicated with the pultrusion cavity and the outer surface, deviating from the pultrusion cavity, of the first mold main body, and a glue injection channel can be defined by the glue injection part, so that a resin glue solution is injected into the pultrusion cavity through the glue injection channel. Wherein the size of the glue injection channel in the width direction of the pultrusion cavity is gradually increased in the glue injection direction, so that the resin glue liquid can be well diffused in the width direction of the pultrusion cavity when being injected into the pultrusion cavity, the fiber impregnation efficiency is improved, and the yarn drying risk caused by insufficient fiber impregnation and non-uniform impregnation is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pultrusion molding process, in particular to a closed pultrusion molding die. Background Art

[0002] In the molding process of composite materials, pultrusion molding process is widely used due to its advantages such as fast molding speed, high fiber content and excellent unidirectional performance. Traditional pultrusion molding process mostly adopts open dipping tank to impregnate the fiber and then pultrudes it into shape, but this open dipping tank is often difficult to maintain the stability of the resin glue, especially for some resins that are sensitive to moisture (such as polyurethane resin). The open dipping tank exposes the resin glue to the air. The moisture in the air gradually increases the viscosity of the resin glue, which is not conducive to the full impregnation of the fiber, thereby affecting the product quality of the pultruded profile. The use of closed pultrusion molding die can greatly reduce the influence of air on the resin glue, but the existing closed pultrusion molding die still has problems such as low impregnation efficiency and uneven impregnation. Utility Model Content

[0003] The main purpose of the utility model is to provide a closed pultrusion forming die to solve the problems of low impregnation efficiency and uneven impregnation of the existing closed pultrusion forming die.

[0004] To achieve the above-mentioned purpose, the utility model provides a closed pultrusion molding die for producing pultruded profiles, the closed pultrusion molding die comprising a first die and a second die, the first die and the second die together enclose a pultrusion cavity;

[0005] The first mold comprises a first mold body and a glue injection portion, the glue injection portion connects a first surface of the first mold body with the pultrusion cavity, and the first surface is an outer surface of the first mold body away from the pultrusion cavity;

[0006] The glue injection portion defines a glue injection channel, and along the glue injection direction, the size of the glue injection channel in the width direction of the pultrusion cavity gradually increases.

[0007] In some embodiments, the glue injection portion defines a glue injection channel, the glue injection portion has at least one glue inlet on one side connected to the first surface, the glue injection portion has a glue outlet on one side connected to the pultrusion cavity, and the glue injection channel connects the glue inlet and the glue outlet;

[0008] Wherein, along the width direction of the pultrusion cavity, the size of the glue outlet is larger than the size of the glue inlet, and smaller than or equal to the size of the pultrusion cavity.

[0009] In some embodiments, the glue outlet includes a plurality of first glue outlet holes, and the plurality of first glue outlet holes are arranged along the width direction of the pultrusion cavity; or,

[0010] The glue outlet includes at least one second glue outlet hole in an elongated strip shape, and the second glue outlet hole extends along the width direction of the pultrusion cavity.

[0011] In some embodiments, the glue injection portion has a preset cross-section, the preset cross-section is perpendicular to the pultrusion direction, and the projection of the glue injection channel on the preset cross-section is an isosceles trapezoid or a semicircle.

[0012] In some embodiments, along the glue injection direction, the size of the glue injection channel in the pultrusion direction gradually decreases.

[0013] In some embodiments, the glue injection part is detachably mounted on the first mold body.

[0014] In some embodiments, the closed pultrusion die further comprises a yarn threading plate, and the yarn threading plate is connected to the yarn inlet of the pultrusion cavity;

[0015] The portion of the yarn-threading plate corresponding to the yarn-entry port is provided with a plurality of yarn-threading through holes, and the fibers enter the pultrusion cavity through the yarn-threading through holes;

[0016] In the thickness direction of the pultrusion cavity, the spacing between adjacent yarn-threading holes located in the middle is greater than the spacing between adjacent yarn-threading holes located at both ends.

[0017] In some embodiments, the closed pultrusion die further comprises two stripping cloth supporting devices, the stripping cloth supporting devices comprising a bracket and a rotating roller mounted on the bracket, the bracket is fixed to one end of the first die or the second die close to the yarn inlet, and the axial direction of the rotating roller is parallel to the width direction of the pultrusion cavity;

[0018] A first stripping cloth inlet is provided at one end of the first surface close to the yarn inlet, and the first stripping cloth inlet is located at a side of the glue injection portion away from the yarn inlet;

[0019] The yarn threading plate is provided with a second stripping cloth inlet, and the second stripping cloth inlet is located on a side of the plurality of yarn threading through holes away from the first surface.

[0020] In some embodiments, the first mold further comprises a pressing block, and when the pressing block is embedded in the first demolding cloth inlet, at least a partial structure exists on a side of the first demolding cloth inlet close to the glue injection portion that can connect the pultrusion cavity with the first surface.

[0021] In some embodiments, a cooling channel is provided in the first mold and / or the second mold, and the cooling channel runs through the closed pultrusion mold, and the cooling channel is not connected to the pultrusion cavity.

[0022] The beneficial effects of the utility model are:

[0023] In the closed pultrusion molding die provided by the utility model, along the glue injection direction, the size of the glue injection channel in the width direction of the pultrusion cavity gradually increases, so that the resin glue can be well diffused in the width direction when injected into the pultrusion cavity, thereby improving the fiber impregnation efficiency and effectively avoiding the risk of dry yarn caused by insufficient and uneven fiber impregnation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 is a schematic diagram of a closed pultrusion die according to an exemplary embodiment;

[0026] Figure 2 is a longitudinal sectional view of a closed pultrusion die according to an exemplary embodiment;

[0027] Figure 3 for Figure 2 A magnified image of area A;

[0028] Figure 4 is a schematic diagram of a glue injection portion according to an exemplary embodiment;

[0029] Figure 5 is a cross-sectional view of a glue injection portion and a pultrusion cavity at a preset cross section according to an exemplary embodiment;

[0030] Figure 6 It is a front view of a threading plate according to an exemplary embodiment.

[0031] In the figure: 1-first mold; 11-first mold body; 110-first surface; 12-glue injection part; 120-glue injection channel; 121-glue inlet; 122-glue outlet; 1220-first glue outlet hole; 13-pressing block; 2-second mold; 3-pultrusion cavity; 31-yarn inlet; 4-yarn threading plate; 41-yarn threading hole; 5-stripping cloth supporting device; 51-bracket; 52-rotating roller; 61-first stripping cloth entrance; 610-stripping cloth channel; 62-second stripping cloth entrance; 7-cooling channel; 8-temperature measuring hole. DETAILED DESCRIPTION

[0032] In a closed pultrusion die, the fiber undergoes the impregnation process and the pultrusion process in the pultrusion cavity. Therefore, the fiber needs to be fully impregnated within a limited time before entering the pultrusion process to ensure the product quality of the pultruded profile. However, in existing closed pultrusion dies, the injection channel is usually a single-hole structure. After the resin glue is injected into the pultrusion cavity from the single hole, it is difficult to fully diffuse in a short time, resulting in insufficient and uneven fiber impregnation, and the pultruded profile is prone to dry yarn risk.

[0033] In order to solve the problems existing in the related art, the present application provides a closed pultrusion molding die, including a first die and a second die, the pultrusion cavity of the closed pultrusion molding die is formed by the first die and the second die, the first die includes a first die body and a glue injection part, the glue injection part connects the pultrusion cavity and the outer surface of the first die body away from the pultrusion cavity, and the glue injection part can define a glue injection channel, so that the resin glue is injected into the pultrusion cavity through the glue injection channel. Among them, along the glue injection direction, the size of the glue injection channel in the width direction of the pultrusion cavity gradually increases, so that the resin glue can be well diffused in the width direction when injected into the pultrusion cavity, thereby improving the impregnation efficiency of the fiber and effectively avoiding the risk of dry yarn caused by insufficient and uneven fiber impregnation.

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present utility model.

[0035] like Figure 1 and Figure 2 As shown, this embodiment provides a closed pultrusion die for producing pultruded profiles. The closed pultrusion die includes a first die 1 and a second die 2. The first die 1 and the second die 2 together enclose a pultrusion cavity 3. The direction from the yarn inlet 31 to the yarn outlet of the pultrusion cavity 3 is the pultrusion direction of the closed pultrusion die ( Figure 2 The first mold 1 and the second mold 2 can be stacked up and down, wherein the first mold 1 can be located above the second mold 2 (refer to Figure 1 ), or the first mold 1 can also be located below the second mold 2 (not shown in the drawings), there is no limitation on this, and the following text takes the first mold 1 being located above the second mold 2 as an example unless otherwise specified.

[0036] like Figure 1 and Figure 2As shown, the first mold 1 includes a first mold body 11 and a glue injection part 12, the glue injection part 12 connects the first surface 110 of the first mold body 11 with the pultrusion cavity 3, the first surface 110 is the outer surface of the first mold body 11 away from the pultrusion cavity 3, that is, the glue injection part 12 connects the pultrusion cavity 3 with the external environment of the closed pultrusion molding mold, and the resin glue can enter the pultrusion cavity 3 through the glue injection part 12. As an example, refer to Figure 1 and Figure 2 , the first surface 110 is the top surface of the first mold body 11, and the glue injection part 12 can inject glue into the pultrusion cavity 3 from top to bottom. In one embodiment, refer to Figure 2 , in the pultrusion direction ( Figure 2 In the +x direction shown in the figure, the pultrusion cavity 3 gradually narrows, so the glue injection part 12 can be arranged at one end of the first mold 1 close to the yarn inlet 31 to facilitate full impregnation of the fiber.

[0037] like Figure 5 As shown, the glue injection portion 12 defines a glue injection channel 120, along the glue injection direction ( Figure 5 -z direction), the injection channel 120 is in the width direction of the pultrusion cavity 3 ( Figure 5 As an example, refer to Figure 3 and Figure 5 , the injection channel 120 is perpendicular to the pultrusion direction ( Figure 3 +x direction as shown), as the resin glue flows toward the pultrusion cavity, the injection channel 120 gradually widens, so that the resin glue can complete a certain degree of diffusion in the width direction of the pultrusion cavity 3 during the process of flowing through the injection channel 120. Compared with the existing single-hole injection structure, the distribution range of the resin glue when entering the pultrusion cavity is significantly expanded, so that the resin glue can be well diffused in its width direction, thereby improving the impregnation efficiency of the fiber and effectively avoiding the risk of dry yarn caused by insufficient and uneven fiber impregnation.

[0038] In one embodiment, if Figure 5 As shown, the side of the glue injection part 12 connected to the first surface 110 has at least one glue inlet 121, and the side of the glue injection part 12 connected to the pultrusion cavity 3 has a glue outlet 122. The glue injection channel 120 connects the glue inlet 121 and the glue outlet 122. The glue outlet 122 is the entrance for injecting the resin glue into the pultrusion cavity 3. Figure 5 The size of the glue outlet 122 is larger than the size of the glue inlet 121, and smaller than or equal to the size of the pultrusion cavity 3. It should be noted that when there are multiple glue inlets 121 (not shown in the drawings), the size of the glue inlet 121 refers to the sum of the sizes of all the glue inlets 121. When the glue outlet 122 has multiple openings (refer to Figure 4), the size of the glue outlet 122 refers to the vertical distance between the farthest ends of all openings that can connect the glue injection part 12 and the pultrusion cavity 3.

[0039] As an example, refer to Figure 3 and Figure 5 The glue inlet 121 and the glue outlet 122 are respectively located in the glue injection channel 120 in the glue injection direction ( Figure 3 At both ends of the pultrusion cavity 3 (in the -z direction as shown), the resin glue enters the glue injection channel 120 from the glue inlet 121 and then leaves the glue injection channel 120 from the glue outlet 122 to enter the pultrusion cavity 3. At the glue inlet 121, in order to minimize the contact area between the glue injection channel 120 and the external environment and reduce the influence of factors such as moisture in the air on the resin glue, the glue injection part 12 has a glue inlet 121 and the glue inlet 121 is in the shape of a small hole. As the glue injection channel 120 is in the width direction ( Figure 5 The size of the glue outlet 122 in the y direction (as shown in the figure) gradually increases, and the size of the glue outlet 122 is also correspondingly larger than the size of the glue inlet 121. The resin glue directly enters the pultrusion cavity 3 after passing through the glue outlet 122, so the size of the glue outlet 122 is the size of the distribution range of the resin glue when entering the pultrusion cavity 3. In the width direction of the pultrusion cavity 3, the size of the glue outlet 122 can be smaller than the size of the pultrusion cavity 3 (not shown in the figure), so as to avoid the flow dead corner in the glue injection channel 120 as much as possible, or the size of the glue outlet 122 can also be equal to the size of the pultrusion cavity 3 (refer to Figure 5 ), at this time, the resin glue can be evenly distributed in the width direction of the pultrusion cavity 3 during the process of flowing through the glue injection channel 120.

[0040] The shape, size and distribution of the glue outlet can be adjusted according to the product structure requirements. Figure 4 As shown, the glue outlet 122 includes a plurality of first glue outlet holes 1220, and the first glue outlet holes 1220 may be circular or elliptical, for example, and the plurality of first glue outlet holes 1220 are arranged along the width direction of the pultrusion cavity 3 ( Figure 4 The resin glue can be arranged in the y direction as shown, for example, evenly arranged in the width direction of the pultrusion cavity 3, so that the resin glue drips into the pultrusion cavity 3 in the shape of a rain curtain, so as to adjust its content in the pultruded profile by controlling the dripping speed of the resin glue. In another embodiment (not shown in the drawings), the glue outlet includes at least one second glue outlet hole in the shape of a long strip, and the second glue outlet hole extends along the width direction of the pultrusion cavity. At this time, the resin glue can flow into the pultrusion cavity in the shape of a waterfall, so that the resin glue is fully spread in the width direction of the pultrusion cavity, ensuring the uniformity of fiber impregnation.

[0041] In one embodiment, if Figure 5 As shown, the glue injection portion 12 has a preset cross section perpendicular to the pultrusion direction, and the projection of the glue injection channel 120 on the preset cross section is an isosceles trapezoid or a semicircle. Figure 5 , Figure 5 The figure includes a preset cross section of the glue injection part 12 perpendicular to the pultrusion direction and a projection of the glue injection channel on the preset cross section. The glue injection part 12 has a glue inlet 121 and the glue inlet 121 is located in the width direction of the pultrusion cavity ( Figure 5 The projection of the glue injection channel 120 on the preset cross section is an isosceles trapezoid: the projection of one end of the glue injection channel 120 connected to the glue inlet 121 is the upper base of the isosceles trapezoid, and the projection of one end of the glue injection channel 120 connected to the glue outlet 122 is the lower base of the isosceles trapezoid. Figure 5 -z direction as shown), the size of the injection channel 120 in the width direction of the pultrusion cavity 3 increases uniformly and is projected to form two sides of an isosceles trapezoid, so that the resin glue can diffuse to both ends at a relatively stable speed during the flow process.

[0042] In one embodiment (not shown in the drawings), the glue injection portion includes two glue inlets, and the projection of a partial structure of the glue injection channel close to the glue inlets on a preset cross section is two isosceles trapezoids or two semicircles, which will not be described in detail here.

[0043] In one embodiment, if Figure 3 As shown, along the injection direction ( Figure 3 -z direction), the injection channel 120 is in the pultrusion direction ( Figure 3 As an example, refer to Figure 3 , the glue injection channel 120 is perpendicular to the pultrusion direction, and the size of the glue injection channel 120 in the pultrusion direction is the thickness of the glue injection channel 120. Along the direction from the glue inlet 121 to the glue outlet 122, as the width of the glue injection channel 120 gradually increases, when the glue injection channel 120 is always of equal thickness, its volume per unit height will increase accordingly, and the cavity wall of the glue injection channel 120 is also difficult to change the flow direction of the resin glue, resulting in the lack of driving force for the resin glue to diffuse and flow in the width direction of the pultrusion cavity. Therefore, the thickness of the glue injection channel 120 can be set to gradually decrease, reducing the volume difference per unit height at various locations, and at the same time, the front and rear cavity walls of the glue injection channel 120 squeeze the resin glue, driving the resin glue to diffuse and flow towards both ends of the width direction of the pultrusion cavity.

[0044] In one embodiment, if Figure 3 As shown, the glue injection part 12 is detachably mounted on the first mold body 11. As an example, refer to Figures 1 to 5The glue injection part 12 is an embedded module structure. A mounting groove is provided on the first mold body 11. The glue injection part 12 is installed on the first mold body 11 by embedding the mounting groove, so that it is convenient to flexibly replace a new glue injection part 12 when the glue injection part 12 is damaged or production needs change. The glue injection part 12 can be connected to the mounting groove by a pin, a limit structure or other methods, and there is no limitation on this.

[0045] In one embodiment, if Figure 3 As shown, the closed pultrusion die also includes a yarn feeding plate 4, which is connected to the yarn inlet 31 of the pultrusion cavity 3. The portion of the yarn feeding plate 4 corresponding to the yarn inlet 31 is provided with a plurality of yarn feeding holes 41, and the fibers enter the pultrusion cavity 3 through the yarn feeding holes 41. As an example, refer to Figure 1 , Figure 3 and Figure 6 The threading plate 4 is arranged in the opposite direction of the closed pultrusion die ( Figure 3 The end portion on the -x direction as shown in the figure is connected to the yarn inlet 31, and the fiber first passes through the yarn feeding plate 4 and then enters the pultrusion cavity 3 through the yarn feeding port 31. In the pultrusion direction, a partial area of ​​the yarn feeding plate 4 coincides with the pultrusion cavity 3, and the partial area has a plurality of arranged yarn feeding holes 41, and the yarn feeding holes 41 are channels for the fiber to pass through the yarn feeding plate 4.

[0046] Due to the pultrusion process of the pultruded profile, the thickness direction ( Figure 6 The combined force of the upper and lower extrusions on the center portion in the z direction (as shown in FIG. 1 ) is often greater than that on the edge portion, and the resin glue in the center portion is easily squeezed out and transferred to the edge portion, resulting in uneven distribution of fibers and resin in the pultruded profile. Therefore, the center portion can contain more resin glue than the edge portion before pultrusion. In one embodiment, as shown in FIG. Figure 6 As shown, in the thickness direction of the pultrusion cavity, the spacing between adjacent yarn threading holes 41 located in the middle (for example, d2) is greater than the spacing between adjacent yarn threading holes 41 located at both ends (for example, d1), so as to fill relatively more resin between the fibers, thereby making the spacing between the fibers tend to be consistent after the pultrusion process, thereby maintaining the product uniformity of the pultruded profile.

[0047] During the production process, a demoulding cloth is often used between the resin glue and the wall of the pultrusion cavity to prevent the two from sticking together. In addition, the demoulding cloth can also increase the roughness of the pultruded profile surface and improve the interlayer bonding strength of subsequent profile products. Figure 2 and Figure 3 As shown, a first stripping cloth inlet 61 is provided at one end of the first surface 110 close to the yarn inlet 31, and the first stripping cloth inlet 61 is located on the side of the glue injection portion 12 away from the yarn inlet 31. At the same time, a second stripping cloth inlet 62 is provided on the yarn threading plate 4, and the second stripping cloth inlet 62 is located on the side of the plurality of yarn threading holes 41 away from the first surface. As an example, Figure 3 and Figure 6 As shown, along the pultrusion direction ( Figure 3 +x direction as shown), the yarn feeding plate 4, the glue injection part 12 and the first demoulding cloth inlet 61 are arranged in sequence, the upper demoulding cloth enters the pultrusion cavity 3 after the resin glue so that it can be sandwiched between the resin glue and the cavity wall of the pultrusion cavity 3, the first demoulding cloth inlet 61 is close to the yarn inlet 31 to shorten the distance between it and the glue injection part 12 as much as possible, and reduce the direct contact area between the resin glue and the upper cavity wall of the pultrusion cavity 3, the second demoulding cloth inlet 62 is located below the distribution area of ​​the yarn feeding through hole 41, and the lower demoulding cloth enters the pultrusion cavity 3 through the second demoulding cloth inlet 62 and wraps the pultruded profile together with the upper demoulding cloth. In another example (not shown in the figure), the first mold 1 is located below the second mold 2, the upper demoulding cloth enters the pultrusion cavity 3 through the second demoulding cloth inlet 62, and the lower demoulding cloth enters the pultrusion cavity 3 through the first demoulding cloth inlet 61, which will not be repeated here.

[0048] In one embodiment, if Figure 1 and Figure 2 As shown, the closed pultrusion mold further includes two stripping cloth supporting devices 5, which are used to provide support for the upper stripping cloth and the lower stripping cloth respectively. The stripping cloth supporting device 5 includes a bracket 51 and a rotating roller 52 installed on the bracket 51. The bracket 51 is fixed to one end of the first mold 1 or the second mold 2 close to the yarn inlet 31. The axial direction of the rotating roller 52 is aligned with the width direction of the pultrusion cavity 3 ( Figure 1 As an example, refer to Figure 1 and Figure 2 The stripping cloth supporting device 5 includes two rotating rollers 52. The two rotating rollers 52 can be connected through a bracket 51 and the relative setting angle between the two can be adjusted to facilitate the adjustment of the mold entry angle of the stripping cloth.

[0049] In one embodiment, the rotating roller can heat the release cloth. For example, the rotating roller is a heating roller or is connected to a hot air device to remove moisture from the release cloth to prevent the release cloth from affecting the properties of the resin adhesive after contact with the resin adhesive.

[0050] In one embodiment, if Figure 3As shown, since the first stripping cloth inlet 61 is arranged on the first surface 110, the upper stripping cloth needs to be bent at a certain angle to fit the cavity wall of the pultrusion cavity 3 after entering the first stripping cloth inlet 61, so the first stripping cloth inlet 61 can be a square opening with a larger size to facilitate the operator to bend the upper stripping cloth. However, after the upper stripping cloth is arranged, the first stripping cloth inlet 61 causes a certain portion of the resin glue to be exposed to the air. Therefore, a pressing block 13 can be arranged in the first mold 1, and the pressing block 13 can be embedded in the first stripping cloth inlet 61 and fill the first stripping cloth inlet 61. When the pressing block 13 is embedded in the first stripping cloth inlet 61, there is at least a partial structure on the side of the first stripping cloth inlet 61 close to the glue injection part 12 that can connect the pultrusion cavity 3 with the first surface 110, refer to Figure 3 The stripping cloth channel 610 ensures that the upper stripping cloth can always smoothly enter the pultrusion cavity 3 during the pultrusion process.

[0051] In one embodiment, if Figure 1 and Figure 2 As shown, cooling channels 7 can be respectively provided in the first mold 1 and the second mold 2. The cooling channel 7 runs through the closed pultrusion molding mold and is not connected with the pultrusion cavity 3. By introducing a fluid with a lower temperature into the cooling channel 7, the temperature in the pultrusion cavity 3 can be lowered, and the pultrusion process parameters can be adjusted to ensure the low-temperature reaction activity and viscosity uniformity of the resin glue.

[0052] In one embodiment, if Figure 1 and Figure 2 As shown, along the pultrusion direction ( Figure 2 +x direction as shown), at least one temperature measuring hole 8 can be provided in the first mold 1 or the second mold 2. The temperature measuring hole 8 can extend from the first surface 110 toward the pultrusion cavity 3 and is not connected to the pultrusion cavity 3. The temperature measuring hole 8 is used to place temperature measuring equipment such as a temperature sensor to monitor the temperature of the pultrusion cavity 3.

[0053] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the utility model concept. The protection scope of the utility model should not be deemed to be limited to the specific forms described in the embodiments. The protection scope of the utility model also includes equivalent technical means that can be thought of by technical personnel in this field based on the concept of the utility model.

Claims

1. A closed pultrusion die for producing pultruded profiles, characterized in that: The closed pultrusion die comprises a first die and a second die, wherein the first die and the second die are together enclosed to form a pultrusion cavity; The first mold comprises a first mold body and a glue injection portion, the glue injection portion connects a first surface of the first mold body with the pultrusion cavity, and the first surface is an outer surface of the first mold body away from the pultrusion cavity; The glue injection portion defines a glue injection channel, and along the glue injection direction, the size of the glue injection channel in the width direction of the pultrusion cavity gradually increases.

2. The closed pultrusion die according to claim 1, characterized in that: The side of the glue injection part connected to the first surface has at least one glue inlet, the side of the glue injection part connected to the pultrusion cavity has a glue outlet, and the glue injection channel connects the glue inlet and the glue outlet; Wherein, along the width direction of the pultrusion cavity, the size of the glue outlet is larger than the size of the glue inlet, and smaller than or equal to the size of the pultrusion cavity.

3. The closed pultrusion die according to claim 2, characterized in that: The glue outlet includes a plurality of first glue outlet holes, and the plurality of first glue outlet holes are arranged along the width direction of the pultrusion cavity; or, The glue outlet includes at least one second glue outlet hole in an elongated strip shape, and the second glue outlet hole extends along the width direction of the pultrusion cavity.

4. The closed pultrusion die according to claim 1, characterized in that: The glue injection portion has a preset cross section, the preset cross section is perpendicular to the pultrusion direction, and the projection of the glue injection channel on the preset cross section is an isosceles trapezoid or a semicircle.

5. The closed pultrusion die according to claim 1, characterized in that: Along the glue injection direction, the size of the glue injection channel in the pultrusion direction gradually decreases.

6. The closed pultrusion die according to claim 1, characterized in that: The glue injection part is detachably mounted on the first mold body.

7. The closed pultrusion die according to claim 1, characterized in that: The closed pultrusion die also includes a yarn threading plate, which is connected to the yarn inlet of the pultrusion cavity; The portion of the yarn-threading plate corresponding to the yarn-entry port is provided with a plurality of yarn-threading through holes, and the fibers enter the pultrusion cavity through the yarn-threading through holes; In the thickness direction of the pultrusion cavity, the spacing between adjacent yarn-threading holes located in the middle is greater than the spacing between adjacent yarn-threading holes located at both ends.

8. The closed pultrusion die according to claim 7, characterized in that: The closed pultrusion die also includes two stripping cloth supporting devices, the stripping cloth supporting devices include a bracket and a rotating roller installed on the bracket, the bracket is fixed to one end of the first die or the second die close to the yarn inlet, and the axial direction of the rotating roller is parallel to the width direction of the pultrusion cavity; A first stripping cloth inlet is provided at one end of the first surface close to the yarn inlet, and the first stripping cloth inlet is located at a side of the glue injection portion away from the yarn inlet; The yarn threading plate is provided with a second stripping cloth inlet, and the second stripping cloth inlet is located on a side of the plurality of yarn threading through holes away from the first surface.

9. The closed pultrusion die according to claim 8, characterized in that: The first mold further comprises a pressing block. When the pressing block is embedded in the first demoulding cloth inlet, at least a partial structure exists on a side of the first demoulding cloth inlet close to the glue injection portion that can connect the pultrusion cavity with the first surface.

10. The closed pultrusion die according to claim 1, characterized in that: A cooling channel is provided in the first die and / or the second die. The cooling channel runs through the closed pultrusion die, and the cooling channel is not connected to the pultrusion cavity.

Images