Mold core positioning method and positioning jig

Abstract

The application provides a core positioning method and positioning jig, and the method comprises the following steps: providing a core-pulling mold, at least one core limiting part and a core positioning structure. The core-pulling mold comprises an upper mold, a lower mold and an elongated core. The core limiting part is positioned and matched with at least the cavity wall of the lower cavity of the lower mold, and the elongated core is matched with the core limiting part to accurately limit the position of the elongated core. The fixed part of the elongated core is fixed through the core fixing structure, and the core limiting part is removed, so that the core-pulling mold cavity is formed between the core and the upper mold and the lower mold. The core positioning method is convenient to operate, can effectively improve the core positioning efficiency, reduce the labor cost, improve the accuracy of core positioning, and effectively control the uniformity of the wall thickness of the pultrusion product.

Description

Technical Field

[0001] This invention relates to the field of pultrusion composite material molding, and more specifically, to a mold core positioning method and positioning fixture. Background Technology

[0002] In the pultrusion process of composite materials, core-pulling molds are often used. The accuracy of the core positioning in the core-pulling mold is related to the uniformity of the wall thickness of the produced product.

[0003] Currently, the commonly used core positioning method requires two operators. One operator adjusts the fixing screws of the core positioning structure to adjust the position of the core in the core-pulling mold, while the other operator measures the offset of the core during the adjustment process. However, this method has the problem of excessive adjustment range and inaccurate core positioning, resulting in uneven wall thickness in products produced using this core-pulling mold. In addition, this core positioning method consumes a lot of the operators' time, which is not conducive to reducing labor costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned deficiencies in the prior art and to provide a mold core positioning method and positioning fixture.

[0005] To achieve the above objectives, the present invention employs the following technical methods:

[0006] A first aspect of the present invention provides a mold core positioning method, the mold core positioning method comprising:

[0007] A core-pulling mold, at least one core limiting part, and a core fixing structure are provided. The core-pulling mold includes an upper mold, a lower mold, and an elongated core. The upper mold has an upper cavity, and the lower mold has a lower cavity. The elongated core includes a core portion and a fixing part connected to one end of the core portion. The core limiting part includes a limiting structure for limiting the core portion in a first plane, which is perpendicular to the extension direction of the elongated core.

[0008] The mold core limiting part is positioned and engaged with the cavity wall of the lower cavity at least at both ends of the lower mold;

[0009] The elongated mold core is fitted with the mold core limiting part so that the limiting structure limits the elongated mold core;

[0010] The fixing part is fixed by the core fixing structure, and the core limiting part is moved out to form the cavity of the core-pulling mold between the core part and the upper mold and the lower mold.

[0011] In this design, the mold core limiting part is positioned and fitted with the cavity wall of the lower chamber. After the mold core limiting part is moved out, the upper mold and the lower mold are fixedly connected to form a cavity; or,

[0012] The mold core limiting part is positioned and fitted with the cavity walls of both the upper and lower cavities.

[0013] When the mold core limiting part is positioned and engaged with the cavity wall of the lower cavity, the mold core limiting part is an integrated sleeve, and the mold core limiting part is moved out from the outlet end of the lower mold.

[0014] When the mold core limiting part is positioned and fitted with the cavity walls of the upper and lower cavities, there are two mold core limiting parts, namely an integrated sleeve and a two-part sleeve. The integrated sleeve is moved out from the exit end of the lower mold, and the upper and lower parts of the two-part sleeve are moved out from the entrance end of the lower mold respectively.

[0015] The fixing part is fixed by the mold core fixing structure, including:

[0016] After tightening the two screws that are opposite each other in the same direction on the mold core fixing structure, tighten the screws that are opposite each other in other directions in turn.

[0017] A second aspect of the present invention provides a positioning fixture for positioning an elongated mold core in a core-pulling mold. The core-pulling mold includes an upper mold, a lower mold, and an elongated mold core. The upper mold has an upper cavity, the lower mold has a lower cavity, and the elongated mold core includes a mold core portion and a fixing portion connected to one end of the mold core portion. The positioning fixture includes:

[0018] The mold core limiting part is at least used for positioning and engaging with the cavity wall of the lower cavity and is separable from the core-pulling mold. When the mold core limiting part is positioned and engaged with the cavity wall of the lower cavity, the mold core limiting part is located at least at both ends of the lower mold. The mold core limiting part includes a limiting structure for limiting the mold core part in a first plane, which is perpendicular to the extension direction of the elongated mold core.

[0019] The mold core fixing structure is used to fix the fixing part.

[0020] The mold core limiting part is provided in two parts, with the two mold core limiting parts located at opposite ends of the lower mold; or...

[0021] There is one mold core limiting part, which extends from one end of the lower mold to the other end of the lower mold.

[0022] When there are two mold core limiting parts, the first mold core limiting part is an integrated sleeve structure located at the outlet end of the lower mold, and the inner surface of the first mold core limiting part is adapted to the elongated mold core. The second mold core limiting part is a two-half structure located at the inlet end of the lower mold, and the inner surface of the second mold core limiting part is adapted to the elongated mold core.

[0023] When there is only one mold core limiting part, the mold core limiting part is an integrated sleeve structure, and the inner surface of the mold core limiting part is adapted to the elongated mold core.

[0024] The mold core fixing structure includes a mold core fixing frame and a mold core fixing component. The mold core fixing component is installed on the mold core fixing frame and abuts against the fixing part of the elongated mold core to fix the fixing part of the elongated mold core.

[0025] The mold core fixing component includes screws, and the mold core fixing frame is an elongated sleeve with four sides. Each side has multiple threaded holes, and the positions of the threaded holes on two opposite sides correspond one-to-one. Each threaded hole contains a screw, which passes through the threaded hole and abuts against the mold core fixing part.

[0026] The positioning fixture also includes a mold fixing frame, the first end of which is connected to the mold core fixing structure, and the second end of which is connected to one end of the core-pulling mold.

[0027] The beneficial effects of this invention are as follows: In the mold core positioning method provided by this invention, the mold core limiting part is at least disposed at both ends of the lower mold and at least positioned and engaged with the cavity wall of the lower chamber. The elongated mold core is engaged with the mold core limiting part, so that the limiting structure on the limiting part defines the position of the elongated mold core, thereby achieving precise positioning of the elongated mold core. The fixing part of the elongated mold core is fixed by the mold core fixing structure, and the mold core limiting part is moved out to form a cavity for the core-pulling mold between the mold core and the upper and lower molds. Using this mold core positioning method to define the mold core position is simple, convenient to operate, and can quickly and accurately determine the mold core position, which is beneficial to improving the mold core positioning efficiency and reducing labor costs. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a mold positioning device in related technologies;

[0030] Figure 2 This is a schematic diagram of a mold core positioning method according to an exemplary embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of a mold core positioning fixture according to an exemplary embodiment of the present invention;

[0032] Figure 4 This is an exploded view of the core positioning fixture structure of an exemplary embodiment of the present invention;

[0033] Figure 5 This is an exploded view of the upper mold, lower mold, first mold core limiting part, and second mold core limiting part structures, which are exemplary embodiments of the present invention.

[0034] In the picture:

[0035] 1-Mold positioning device; 11-Mold core; 12-Mold core positioning structure; 13-Positioning screw; 131-First positioning screw; 132-Second positioning screw; 21-Mold core fixing structure; 211-Mold core fixing frame; 212-Mold core fixing part; 23-Mold core limiting part; 231-First mold core limiting part; 232-Second mold core limiting part; 3-Core pulling mold; 31-Upper mold; 311-Upper cavity; 32-Lower mold; 321-Lower cavity; 33-Long mold core; 331-Fixing part; 332-Mold core part; 34-Inlet; 35-Outlet; 4-Mold fixing frame; 41-Rectangular connecting plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0037] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In related technologies, refer to Figure 1The mold core 11 is positioned using the mold core positioning structure 12. Specifically, the mold core positioning structure 12 includes four side walls, on which eight positioning screws 13 are provided, with corresponding positioning screws 13 on opposite side walls. The mold core positioning method is as follows: when the mold core 11 needs to be adjusted upwards, the second positioning screw 132 is kept stationary, and one operator screws down the first positioning screw 131 to press down one end of the mold core 11, causing the other end of the mold core 11 to lift up; or, the first positioning screw 131 is kept stationary, and one operator pushes up the screw opposite to the second positioning screw 132 (not shown in the figure), thereby achieving the purpose of adjusting the mold core upwards. However, this method of adjusting the mold core 11 requires the cooperation of two operators. During the adjustment of the mold core 11, one operator is responsible for adjusting the position of the positioning screws 13, while the other operator needs to measure the offset distance of the mold core 11 each time it is adjusted to accurately fix the position of the mold core 11. In addition, in this method of adjusting the mold core 11, the offset distance of the mold core 11 is too large, making it difficult to adjust the mold core 11 to the correct position. Therefore, the positioning of the mold core 11 takes a long time and the labor cost is high.

[0039] Based on this, the present invention provides a method for positioning a mold core and a positioning fixture.

[0040] The following is combined with Figures 2 to 5 The embodiments of the present invention will be further described below.

[0041] To facilitate understanding, the structure of the core-pulling mold and positioning fixture using this core positioning method will be introduced first. For example... Figures 3 to 5 As shown, the core-pulling mold 3 includes an upper mold 31, a lower mold 32, and an elongated mold core 33. The upper mold 31 has an upper cavity 311; the lower mold 32 has a lower cavity 321; and the elongated mold core 33 includes a mold core portion 332 and a fixing portion 331 connected to one end of the mold core portion 332. The positioning fixture includes a mold core limiting portion 23 and a mold core fixing structure 21. The limiting structure is used to limit the mold core portion 332 within a first plane, which is perpendicular to the extending direction of the elongated mold core 33.

[0042] like Figure 2 As shown, an exemplary embodiment of the present invention provides a mold core positioning method, comprising the following steps:

[0043] S100: Provides a core-pulling mold, at least one core limiting part and a core fixing structure;

[0044] S200: The mold core limiting part is positioned and engaged with the cavity wall of the lower cavity at least at both ends of the lower mold;

[0045] S300: The elongated mold core is fitted with the mold core limiting part so that the limiting structure limits the elongated mold core;

[0046] S400: The fixing part is fixed by the core fixing structure, and the core limiting part is moved out to form the cavity of the core-pulling mold between the core part and the upper mold and the lower mold.

[0047] Reference Figures 2 to 4 In the core positioning method provided in this embodiment, a core-pulling mold 3, at least one core limiting part 23, and a core fixing structure 21 are first provided. The core limiting part 23 is positioned and engaged with at least the lower cavity 321 of the lower mold 32. The core limiting part 23 is located at least at both ends of the lower mold 32, thereby providing effective support for the elongated core 33, ensuring the stability of the elongated core 33, and facilitating the determination of the position of the elongated core 33. After determining the position of the elongated core 33, the fixing part 331 of the elongated core 33 is fixed by the core fixing structure 21 to prevent the position of the elongated core 33 from moving. Then, the core limiting part 23 is moved out, so that the core part 332 and the upper mold 31 and lower mold 32 can form a cavity of the core-pulling mold 3, so that the raw material can enter the cavity for molding.

[0048] Reference Figure 3 In step S100, the core-pulling mold 3 includes an upper mold 31, a lower mold 32, and an elongated core 33. The lower mold 32 has a lower cavity 321, which is formed by a recess in the upper surface of the lower mold 32. The upper mold 31 has an upper cavity 311, which is formed by a recess in the lower surface of the upper mold 31. Both the upper cavity 311 and the lower cavity 321 are used to contain the composite material to achieve pultrusion molding of the composite material, thereby preparing the corresponding product.

[0049] The elongated mold core 33 includes a mold core portion 332 and a fixing portion 331 connected to one end of the mold core portion 332. The mold core portion 332 forms a cavity for the core-pulling mold 3 between the upper mold 31 and the lower mold 32 to accommodate the composite material for pultrusion molding. The fixing portion 331 connected to one end of the mold core portion 332 cooperates with the mold core fixing structure 21 to fix the position of the elongated mold core 33 in a plane perpendicular to its extension direction, preventing the elongated mold core 33 from shifting during the composite material pultrusion molding process, thereby avoiding uneven wall thickness of the molded product caused by misalignment of the elongated mold core 33.

[0050] Reference Figure 5 In step S200, the upper surface of the lower mold 32 has a groove structure, and the space formed by the groove structure is the lower cavity 321 of the lower mold 32. The groove structure includes two side walls and a lower wall. The outer surface shape of the mold core limiting part 23 is adapted to the shape of the lower cavity 321 and can fit with the side walls and the lower wall.

[0051] Reference Figure 4In step S300, the limiting structure of the mold core limiting part 23 cooperates with the mold core part 332, so that the limiting structure can accurately limit the position of the mold core part 332 relative to the lower mold 32, and thus the limiting structure can limit the position of the elongated mold core 33 relative to the lower mold 32.

[0052] In step S400, the core fixing structure 21 is installed at one end of the inlet 34 of the lower mold 32 to fix the elongated core 33 after its position is determined, preventing external forces from causing the elongated core 33 to shift and thus ensuring the uniformity of the wall thickness of the molded product. After fixing, the core limiting part 23 needs to be removed to prevent it from affecting the pultrusion molding of the composite material, allowing the composite material to directly enter the cavity formed between the core part 332, the upper mold 31, and the lower mold 32, so as to obtain a pultruded product with uniform wall thickness.

[0053] In one embodiment, the core limiting part 23 may only engage with the cavity wall of the lower chamber 321 to position the elongated core 33. In this embodiment, the core limiting part 23 is an integrated sleeve. After positioning, the core limiting part 23 is moved out from the outlet 35 end of the lower mold 32. The upper mold 31 and the lower mold 32 are fixedly connected, thereby forming the cavity of the core-pulling mold 3 between the upper cavity 311 of the upper mold 31, the lower cavity 321 of the lower mold 32, and the elongated core 33.

[0054] In this embodiment, the inlet 34 of the lower mold 32 is the end of the lower mold 32 connected to the preforming device, and the outlet 35 of the lower mold 32 is the end of the lower mold 32 away from the preforming device. When the core limiting part 23 can position the elongated core 33 simply by engaging with the cavity wall of the lower chamber 321, the core limiting part 23 is an integrated sleeve. The length of the sleeve can be from the inlet 34 to the outlet 35 of the lower mold 32, or the length of the sleeve can be the same as the length of the core part 332 of the elongated core 33. After the positioning of the elongated core 33 is completed, the integrated sleeve is moved out from the outlet 35 of the lower mold 32, and then the upper mold 31 is fixed to the lower mold 32, so that the cavity of the core-pulling mold 3 can be formed between the upper chamber 311 of the upper mold 31, the lower chamber 321 of the lower mold 32, and the elongated core 33.

[0055] Reference Figure 3In another embodiment, the core limiting part 23 is positioned and engaged with the cavity wall of the lower chamber 321, and then the upper mold 31 and the lower mold 32 are fixedly connected, so that the core limiting part 23 is positioned and engaged with both the upper chamber 311 and the lower chamber 321. In this embodiment, there are two core limiting parts 23, namely an integrated sleeve and a two-part sleeve. After positioning, the integrated sleeve is moved out from the outlet 35 end of the lower mold 32, and the upper and lower parts of the two-part sleeve are moved out from the inlet 34 end of the lower mold 32, so that the cavity of the core-pulling mold 1 can be formed between the upper chamber 311 of the upper mold 31, the lower chamber 321 of the lower mold 32, and the elongated core 33.

[0056] For example, the length of the integrated sleeve is the same as the length of the two-part sleeve, and the sum of the lengths of the integrated sleeve and the two-part sleeve is less than the length from the inlet 34 to the outlet 35 of the lower mold 32. After the elongated mold core 33 is positioned, the integrated sleeve is moved out of the outlet 35 of the lower mold 32, then the upper part of the two-part sleeve is moved out of the inlet 34 of the lower mold 32, and finally the lower part of the two-part sleeve is moved out of the inlet 34 of the lower mold 32. The mold core limiting part 23 located at the inlet 34 of the lower mold 32 is set as a two-part sleeve structure, which facilitates the separation and removal of the mold core limiting part 23 after the elongated mold core 33 is positioned, and avoids the mold core fixing structure 21 or other structures on the outlet 35 side of the lower mold 32 affecting the removal of the mold core limiting part 23.

[0057] In one embodiment of the present invention, fixing the fixing part 331 by the mold core fixing structure 21 includes: simultaneously tightening two screws of the mold core fixing structure 21 that are opposite each other in the same direction, and then simultaneously tightening the screws that are opposite each other in other directions in sequence.

[0058] In this embodiment, the elongated mold core 33 includes four side walls. The mold core fixing structure 21 consists of an elongated sleeve that can mate with the elongated mold core 33 and eight screws disposed on the four side walls of the elongated sleeve. There are four sets of screws, with two sets disposed on each side, and each set of screws is disposed on two opposite sides. After determining the position of the elongated mold core 33, the two corresponding screws in the same direction of the mold core fixing structure 21 are tightened simultaneously, and then the corresponding screws in the other directions are tightened in sequence, thereby fixing the position of the elongated mold core 33.

[0059] The following is combined with Figure 3 and Figure 4The specific process of the core positioning method of the present invention is as follows: First, the entrance 34 side of the lower mold 32 of the core-pulling mold 3 is fixedly installed on the mold fixing frame 4. The core fixing structure 21 cooperates with the fixing part 331 of the elongated core 33. The screws on each side of the core fixing structure 21 are loosened to give the elongated core 33 a certain amount of room to move. The core limiting part 23 is positioned and cooperates with the cavity wall of the lower chamber 321 of the lower mold 32 to limit the elongated core 33. The two screws on the core fixing structure 21 that are opposite each other in the same direction are tightened to prevent the elongated core 33 from moving. Then, the screws on the other opposite sides in each direction are tightened in sequence to position the elongated core 33 that has been limited. After the elongated core 33 is positioned, the core limiting part 23 is removed. Thus, the cavity of the core-pulling mold 3 is formed between the core part 332, the upper mold 31, and the lower mold 32.

[0060] In this embodiment, the core limiting part 23 consists of an integrated sleeve and a two-part sleeve. The core limiting part 23 cooperates with the cavity walls of the lower cavity 321 and the upper cavity 311 respectively to limit the position of the elongated core 33. After tightening the core fixing member 212 of the core fixing structure 21, the integrated sleeve is removed from the outlet 35 of the lower mold 32, and the upper part of the two-part sleeve is removed from the inlet 34 of the lower mold 32 first, and then the lower part of the two-part sleeve is removed from the inlet 34 of the lower mold 32, so that the core part 332 forms a cavity of the core-pulling mold 3 between the upper mold 31 and the lower mold 32.

[0061] Reference Figures 3 to 5 An exemplary embodiment of the present invention also provides a positioning fixture for positioning an elongated core 33 in a core-pulling mold 3. This positioning fixture can be positioned using the method described above. The core-pulling mold 3 includes an upper mold 31, a lower mold 32, and an elongated core 33. The upper mold 31 has an upper cavity 311 formed by a recess in its lower surface; the lower mold 32 has a lower cavity 321 formed by a recess in its upper surface. The upper cavity 311 and the lower cavity 321 can be used to accommodate composite materials in a pultrusion molding process. The elongated core 33 includes a core portion 332 and a fixing portion 331 connected to one end of the core portion 332. Exemplarily, the cross-sectional area of ​​the fixing portion 331 is smaller than the cross-sectional area of ​​the core portion 332, thereby reducing the size of the fixing portion 331 and facilitating its fixed connection with the core fixing structure 21.

[0062] In this embodiment, the positioning fixture includes a core limiting part 23, which at least positions and cooperates with the cavity wall of the lower chamber 321 to define the position of the elongated core 33. After the elongated core 33 is fixed in the position defined by the core limiting part 23, the core limiting part 23 can be separated from the core-pulling mold 3. When the core limiting part 23 positions and cooperates with the cavity wall of the lower chamber 321, the end of the core limiting part 23 is located at at least at both ends of the lower mold 32. The core limiting part 23 includes a limiting structure for defining the position of the core part 332 in a first plane to accurately define the position of the elongated core 33. The first plane is a plane perpendicular to the extension direction of the elongated core 33. The core fixing structure 21 is used to fix the fixing part 331 of the elongated core 33, thereby preventing the elongated core 33 from moving after the position of the elongated core 33 is defined.

[0063] In one embodiment, reference is made to Figure 4 There are two mold core limiting parts 23, which are located at the two ends of the lower mold respectively. For example, the length of each mold core limiting part 23 is 30% of the length of the lower mold 32. The length of the mold core limiting part 23 can be determined according to actual needs, and this embodiment does not impose any restrictions.

[0064] In another embodiment, the core limiting part 23 is a single part (not shown in the figure), the length of which can be equal to the length of the lower mold 32, that is, extending from one end of the lower mold 32 to the other end of the lower mold 32. The length of the core limiting part 23 can also exceed the length of the lower mold 32, so as to facilitate the removal of the core limiting part 23 after the core limiting part 23 is positioned.

[0065] In one embodiment, reference is made to Figure 4 and Figure 5 The two mold core limiting parts 23 are a first mold core limiting part 231 and a second mold core limiting part 232. The first mold core limiting part 231 is an integrated sleeve structure, its inner surface adapting to the elongated mold core 33, located at one end of the outlet 35 of the lower mold 32. The integrated sleeve structure provides greater stability and facilitates precise positioning of the elongated mold core 33. The second mold core limiting part 232 is a two-part structure, its inner surface adapting to the elongated mold core 33, located at one end of the inlet 34 of the lower mold 32. Since the elongated mold core 33 needs to extend from the inlet 34 of the lower mold 32 for fixation, a two-part structure is adopted to prevent the second mold core limiting part 232 from being difficult to move out.

[0066] In one embodiment, both mold core limiting parts 23 are two-half sleeve structures, and their inner surfaces are adapted to the elongated mold core 33. The two mold core limiting parts 23 are respectively located at one end of the outlet 35 of the lower mold 32 and one end of the inlet 34 of the lower mold 32, so that each mold core limiting part 23 can be taken out in two parts.

[0067] In another embodiment, there is one core limiting part 23. In this case, the core limiting part 23 is an integrated sleeve structure, and its inner surface is adapted to the elongated core 33. The length of the core limiting part 23 can be the same as the length of the lower mold 32, so that only one core limiting part 23 is needed to accurately define the position of the elongated core 33. For example, the core is a cuboid with four sides, and the core limiting part 23 adapted to the elongated core 33 is an elongated sleeve, which also has four sides, so that the inner surface of the core limiting part 23 can fit against the outer surface of the elongated core 33.

[0068] Reference Figure 3 In one embodiment, the mold core fixing structure 21 includes a mold core fixing frame 211 and a mold core fixing member 212. The mold core fixing frame 211 is an elongated sleeve that matches the elongated mold core 33, and has four sides. Its longitudinal section is rectangular. The mold core fixing frame 211 can also be an elongated sleeve with a trapezoidal, triangular, circular, or hexagonal longitudinal section; this embodiment does not impose any limitation. The mold core fixing member 212 is installed on the mold core fixing frame 211. Each mold core fixing member 212 passes through a through hole in the mold core fixing frame 211 and abuts against the fixing part 331 of the elongated mold core 33 to fix the elongated mold core 33, thereby preventing the elongated mold core 33 from moving.

[0069] Reference Figure 4 In one embodiment, the mold core fixing member 212 is, exemplarily, a screw, but it can also be a bolt or rivet. The mold core fixing frame 211 is a cuboid sleeve that matches the elongated mold core 33. Multiple threaded holes are provided on each of the four sides of the mold core fixing frame 211. Exemplarily, two threaded holes are provided on each side, but three or four can also be provided to improve the fixing effect of the mold core fixing structure 21. The positions of the threaded holes on opposite sides of the mold core fixing frame 211 correspond one-to-one, and a screw passes through each threaded hole. Each screw can abut against the fixing part 331 of the elongated mold core 33, thereby effectively defining the position of the elongated mold core 33 and securing it.

[0070] Reference Figure 3 and Figure 4In one embodiment, the positioning fixture includes a mold fixing frame 4, which is used to fix the upper mold 31 and the lower mold 32, preventing the upper mold 31 or the lower mold 32 from moving during the positioning of the elongated mold core 33 and the pultrusion molding process, and avoiding uneven product wall thickness caused by the movement of the upper mold 31 or the lower mold 32. Exemplarily, the mold fixing frame 4 is a cuboid frame. The first end of the mold fixing frame 4 is fixedly connected to the mold core fixing structure 21. The mold fixing frame 4 is located in the middle of the mold core fixing structure 21, avoiding the position of the threaded hole, so that the operator can easily adjust the screws located on the mold core fixing structure 21. The upper and lower parts of the second end of the mold fixing frame 4 are respectively provided with rectangular connecting plates 41. The rectangular connecting plates 41 are used to fix and connect to the outer surfaces of the lower mold 32 and the upper mold 31, which helps to increase the stability of the core-pulling mold 3 and avoid the core-pulling mold 3 from shifting position.

[0071] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this invention should not be considered as limited to the specific forms stated in the embodiments. The scope of protection of this invention also includes equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A method of positioning a mold core, comprising: The core positioning method comprises: providing a core-pulling mold (3), at least one core limiting part (23) and a core fixing structure (21), the core-pulling mold comprising an upper mold (31), a lower mold (32) and an elongated core (33), the upper mold (31) having an upper cavity (311), the lower mold (32) having a lower cavity (321), the elongated core (33) comprising a core part (332) and a fixing part (331) connected to one end of the core part (332), the core limiting part (23) comprising a limiting structure for limiting the core part (332) in a first plane perpendicular to the extension direction of the elongated core (33); positioning the core limiting part (23) with the cavity wall of the lower cavity (321) at least, the core limiting part (23) being located at least at both ends of the lower mold (32); cooperating the elongated core (33) with the core limiting part (23) so that the limiting structure limits the elongated core (33); fixing the fixing part (331) by the core fixing structure (21) and moving the core limiting part (23) out to form a cavity of the core-pulling mold (3) between the core part (332) and the upper mold (31) and the lower mold (32).

2. The core positioning method of claim 1, wherein The core limiting part (23) is positioned with the cavity wall of the lower cavity (321), after moving the core limiting part (23) out, the upper mold (31) and the lower mold (32) are fixedly connected to form the cavity; or, The core limiting part (23) is positioned with the cavity wall of the upper cavity (311) and the lower cavity (321).

3. The core positioning method of claim 2, wherein, When the core limiting part (23) is positioned with the cavity wall of the lower cavity (321), the core limiting part (23) is an integrated sleeve, and the core limiting part (23) is moved out from one end of the outlet (35) of the lower mold (32); When the core limiting part (23) is positioned with the cavity wall of the upper cavity (311) and the lower cavity (321), the core limiting part (23) is two, which are an integrated sleeve and a two-piece sleeve, the integrated sleeve is moved out from one end of the outlet (35) of the lower mold (32), and the upper part and the lower part of the two-piece sleeve are moved out from one end of the inlet (34) of the lower mold (32) respectively.

4. The core positioning method of claim 1 wherein, Fixing the fixing part (331) by the core fixing structure (21) comprises: After tightening the two screws arranged in the same direction on the core fixing structure (21) at the same time, tighten the screws arranged in other directions at the same time in sequence.

5. A positioning jig for positioning of an elongated core (33) in a core-drawing mold (3), characterized in that, The core-pulling mold (3) comprises an upper mold (31) having an upper cavity (311), a lower mold (32) having a lower cavity (321), and the elongated mold core (33) comprising a mold core part (332) and a fixed part (331) connected to one end of the mold core part (332), and the positioning jig comprises: A mold core limiting part (23) is used at least for positioning cooperation with the cavity wall of the lower cavity (321) and can be separated from the core-pulling mold (3), and when the mold core limiting part (23) is positioned and cooperated with the cavity wall of the lower cavity (321), the mold core limiting part (23) is located at least at both ends of the lower mold (32), and the mold core limiting part (23) comprises a limiting structure for limiting the mold core part in a first plane perpendicular to the extension direction of the elongated mold core. A mold core fixing structure (21) is used for fixing the fixed part (331).

6. The positioning fixture of claim 5, wherein The mold core limiting part (23) is provided with two, and the two mold core limiting parts (23) are located at both ends of the lower mold (32); or, The mold core limiting part (23) is one, and the mold core limiting part (23) extends from one end of the lower mold (32) to the other end of the lower mold (32).

7. The positioning fixture of claim 5, wherein When the mold core limiting part (23) is provided with two, the first mold core limiting part (231) is an integrated sleeve structure located at one end of the outlet (35) of the lower mold (32), the inner surface of the first mold core limiting part (231) is matched with the elongated mold core (33), and the second mold core limiting part (232) is a two-half structure located at one end of the inlet (34) of the lower mold (32), the inner surface of the second mold core limiting part (232) is matched with the elongated mold core (33); When the mold core limiting part (23) is one, the mold core limiting part (23) is an integrated sleeve structure, and the inner surface of the mold core limiting part (23) is matched with the elongated mold core (33).

8. The positioning fixture of claim 5, wherein, The mold core fixing structure (21) comprises a mold core fixing frame (211) and a mold core fixing piece (212), the mold core fixing piece (212) is installed on the mold core fixing frame (211), and the mold core fixing piece (212) abuts against the fixed part (331) of the elongated mold core (33) to fix the fixed part (331) of the elongated mold core (33).

9. The positioning fixture of claim 8, wherein, The mold core fixing piece (212) comprises a screw, the mold core fixing frame (211) is an elongated sleeve provided with four sides, a plurality of threaded holes are arranged on each side, the positions of the threaded holes on the opposite two sides correspond one by one, the screw is arranged in each threaded hole, and the screw passes through the threaded hole and abuts against the fixed part (331) of the elongated mold core (33).

10. The positioning fixture according to any one of claims 5 to 9, wherein The positioning jig further comprises a mold fixing frame (4), a first end of the mold fixing frame (4) is connected with the mold core fixing structure (21), and a second end of the mold fixing frame (4) is connected with one end of the core-pulling mold (3).

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