Injection mold

Abstract

The utility model discloses an injection mold which is used for producing pultrusion products, the injection mold is of a long straight tubular structure, the injection mold sequentially comprises a glue injection section, a glue extrusion section and a forming section which are connected in a sealed mode in the pultrusion advancing direction, and the glue injection section is used for containing resin glue liquid and infiltrating yarn; the glue extruding section is used for extruding redundant resin glue on passing yarns, the forming section is used for curing the yarns soaked with the resin glue to form a pultrusion product, the inner diameter of the glue injecting section is larger than that of the glue extruding section and that of the forming section, and a detachable yarn threading plate is arranged at an inlet of the glue injecting section. According to the injection mold, the pressure required by the resin glue solution to pass through the threading plate can be controlled, the leakage amount of the resin glue solution can be reduced to the maximum extent, and waste is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of composite material forming equipment, and particularly to an injection mold. Background Art

[0002] In the field of pultrusion forming technology, an open wetting device is usually used to accommodate resin glue and wet the yarn. However, since the resin glue in such a device is in the air environment for a long time, it is easy to deteriorate, affecting the wetting effect of the yarn and thus the product quality. The injection pultrusion technology can wet the yarn in a closed environment. However, the existing injection molds have complex structures, irregular shapes, are difficult to process, and the yarn inlet size of the injection mold is too large, unable to form a good closed wetting cavity, resulting in the overflow and dripping of excess resin glue from the yarn inlet, causing waste and pollution. Utility Model Content

[0003] Aiming at the deficiencies of the prior art, the purpose of the present application is to provide an injection mold with a simple structure, easy to manufacture, and capable of controlling the leakage pressure of the resin glue in the glue injection section by replacing the yarn-passing plates with different thicknesses, effectively avoiding the waste and pollution caused by the leakage of resin glue from the yarn-passing holes.

[0004] To solve the above technical problems, the technical solution adopted by the present application is: to provide an injection mold for producing pultruded products. The injection mold is a long straight tubular structure. Along the pultrusion forward direction, the injection mold successively includes a glue injection section, a glue extrusion section, and a forming section that are hermetically connected to each other. The glue injection section is used to accommodate resin glue and wet the yarn. The glue extrusion section is used to extrude the excess resin glue on the passing yarn. The forming section is used to cure and form the yarn wet with resin glue into a pultruded product. The inner diameter of the glue injection section is larger than the inner diameters of the glue extrusion section and the forming section. A detachable yarn-passing plate is provided at the inlet of the glue injection section.

[0005] Among them, the glue injection section, the glue extrusion section, and the forming section are all connected by a concave-convex structure.

[0006] Among them, sealing rings are provided at both axial ends of the yarn-passing plate.

[0007] Among them, an installation port is provided at the inlet of the glue injection section for installing the yarn-passing plate, and the diameter of the installation port matches the outer diameter of the yarn-passing plate.

[0008] Among them, the glue injection section is connected to a temperature control device, and the temperature control device adopts a dual temperature control mode to control the temperature of the resin glue in the glue injection section.

[0009] Among them, the temperature control device includes a heater, a first temperature sensor, and a second temperature sensor. The heater is connected to the first temperature sensor through an external circuit. The first temperature sensor is used to measure the actual temperature of the resin glue in the glue injection section. The heater is connected to the second temperature sensor through an internal circuit. The second temperature sensor is used to measure the actual temperature inside the heater.

[0010] Among them, the glue injection section is provided with at least one injection port, and the injection port is located on the top wall of the glue injection section.

[0011] Among them, the glue injection section is provided with at least one feeding port, and the feeding port is located on the bottom wall of the glue injection section.

[0012] Among them, a heating device is provided on the outer periphery of the forming section, and the heating device includes a plurality of heating plates.

[0013] Among them, an extended section is provided between the forming section and the glue extrusion section.

[0014] The beneficial effects of this application are as follows: Different from the prior art, the injection mold of this application successively includes a glue injection section, a glue extrusion section, and a forming section that are hermetically connected to each other through concave-convex structures. The hermetic connection can prevent the resin glue in the injection mold from being exposed to the air and deteriorating, enabling the resin glue to always maintain excellent performance to ensure the infiltration effect of the yarn, and thus ensuring the quality of the pultruded product.

[0015] At the same time, the glue injection section is connected to a temperature control device with a dual temperature control mode, which can control both the internal circuit and the external circuit simultaneously. It can achieve real-time monitoring and precise control of the temperature of the resin glue in the glue injection section, and can also protect the heating device, with good safety.

[0016] In addition, a detachable yarn-passing plate is provided at the installation port of the glue injection section. By installing yarn-passing plates with different thicknesses, the injection mold of this application can control the leakage pressure required for the resin glue to pass through the yarn-passing plate. Thus, while the resin glue in the glue injection section meets the yarn infiltration requirements, it cannot leak through the yarn-passing holes, which can minimize the leakage amount of the resin glue and reduce waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0018] Figure 1 is a schematic structural diagram of an injection mold 100 in an embodiment of this application;

[0019] Figure 2It is a sectional view of an injection mold 100 in an embodiment of the present application;

[0020] Figure 3 is Figure 2 an enlarged view of part A in

[0021] Figure 4 It is a sectional view of a glue injection section 110 in an embodiment of the present application;

[0022] Figure 5 It is a front view of a yarn-passing plate 113 in an embodiment of the present application. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0024] Refer to Figures 1 to 5 , the present application provides an injection mold 100 for producing pultruded products. The injection mold 100 and a glue injection machine form an injection device. The injection device injects resin glue into the injection mold 100 through the glue injection machine, so that the yarn is infiltrated and cured through the injection mold 100 to form a pultruded product; the injection mold 100 is a long straight tubular structure, and this kind of structural shape is regular, which is beneficial to processing and reduces the processing cost. Along the pultrusion forward direction, that is Figure 1In the X direction marked, the injection mold 100 sequentially includes a glue injection section 110, a glue extrusion section 120, and a forming section 130 that are hermetically connected to each other. The sealed connection between the glue injection section 110, the glue extrusion section 120, and the forming section 130 can keep the injection mold 100 in a relatively airtight environment, prevent the resin glue solution in the injection mold 100 from being exposed to the air and deteriorating, keep the resin glue solution in excellent performance, thereby ensuring the quality of the pultruded product. At the same time, it can also prevent the resin glue solution from leaking from the connection between the glue injection section 110, the glue extrusion section 120, and the forming section 130, increase the utilization rate of the resin glue solution, and reduce waste. The glue injection section 110 is used to accommodate the resin glue solution and infiltrate the yarn. The glue extrusion section 120 is used to extrude the excess resin glue solution on the yarn. The forming section 130 is used to cure and form the yarn infiltrated with the resin glue solution into a pultruded product. The inner diameter of the glue injection section 110 is larger than the inner diameters of the glue extrusion section 120 and the forming section 130, so that when the yarn enters the glue extrusion section 120 after being infiltrated with the resin glue solution in the glue injection section 110, the excess resin glue solution can be extruded, and after being preformed by the glue extrusion section 120 and entering the forming section 130, it can be cured at high temperature to form a pultruded product. A detachable yarn-passing plate 113 is provided at the entrance of the glue injection section 110. Thus, by installing yarn-passing plates 113 with different thicknesses, the leakage pressure required for the resin glue solution to pass through the yarn-passing plate 113 can be controlled, so that the resin glue solution in the glue injection section 110 can meet the yarn infiltration requirements and cannot leak through the yarn-passing holes 114, which can minimize the leakage amount of the resin glue solution and reduce waste.

[0025] Refer to Figures 1 to 4, in this embodiment, the resin injection section 110, the resin extrusion section 120, and the forming section 130 are all straight tubular structures and are all circular tubes with approximately equal outer diameters, which is convenient for the processing and assembly of the injection mold 100. The three are coaxially arranged, facilitating the smooth passing of the yarn without bending and damage, and can effectively ensure the finished product quality of the pultruded product. The resin extrusion section 120 and the forming section 130 are respectively used for preforming and heat-curing and forming the pultruded product, and their inner diameters are set equal to the outer diameter of the pultruded product corresponding to the specification of the injection mold 100. The inner diameter of the resin injection section 110 is set larger than the inner diameters of the resin extrusion section 120 and the forming section 130, that is, the inner diameter of the resin injection section 110 is larger than the outer diameter of the produced pultruded product, which can ensure that enough resin glue can be accommodated in the resin injection section 110 to fully infiltrate all the yarns passing through the resin injection section 110, enabling the yarns to obtain a good infiltration effect, thereby ensuring the product quality. The inner diameters of the resin extrusion section 120 and the forming section 130 are set equal to the outer diameter of the produced pultruded product. On the one hand, the inner diameter of the resin extrusion section 120 is smaller than that of the resin injection section 110, which is convenient for the resin glue on the infiltrated yarn to extrude the excess resin glue on the yarn and discharge the air bubbles brought into the yarn when entering the resin extrusion section 120, so as to ensure that the resin content of the pultruded product meets the requirements and avoid the presence of air bubbles inside the product, which may affect the product performance. On the other hand, the inner diameters of the resin extrusion section 120 and the forming section 130 are equal, and the infiltrated yarn can be directly heat-cured and formed into a pultruded product when entering the forming section 130 after being preformed in the resin extrusion section 120, improving the production efficiency. In other embodiments, the resin injection section, the resin extrusion section, and the forming section can also be square tubes or tubular structures of other shapes, and the sizes of their inner and outer diameters can also be adjusted according to the production requirements of the pultruded product, which is not limited here.

[0026] In this embodiment, the resin injection section 110 is provided with an injection port 111, which is located on the top wall of the resin injection section 110. The injection port 111 is connected to a resin injection machine through a glue delivery pipe (not shown in the figure) and is used to inject the resin glue in the resin injection machine into the resin injection section 110 through the glue delivery pipe. The injection port 111 being located on the top wall of the resin injection section 110 is convenient for filling the resin injection section 110 with resin glue and can effectively prevent the resin glue from overflowing from the injection port 111 during the injection process. In other embodiments, the resin injection section can also be provided with two, three or more injection ports, and the number and setting positions of the injection ports can be adjusted according to the production requirements of the pultruded product. The resin injection machine can adopt existing technologies, which is not limited here.

[0027] In this embodiment, the glue injection section 110 is provided with a material discharge port 112, which is located on the bottom wall of the glue injection section 110. The material discharge port 112 is connected to a resin glue liquid recovery device (not shown in the figure) through a material discharge pipe (not shown in the figure), and is used to recover the remaining resin glue liquid in the glue injection section 110 after the production is completed, so as to improve the material utilization rate. The material discharge port 112 being located on the bottom wall of the glue injection section 110 enables the remaining resin glue liquid in the glue injection section 110 to be smoothly discharged from the material discharge port 112 after the production is completed, facilitating the emptying of the glue injection section 110. In other embodiments, the glue injection section may also be provided with two, three or more material discharge ports, and the number and setting positions of the material discharge ports can be adjusted according to the production requirements of the pultruded product, which are not limited herein.

[0028] The glue injection section 110, the glue extrusion section 120 and the forming section 130 are all connected by a concave-convex structure 140 in a matching manner. The concave-convex structure 140 includes a groove 141 and a protrusion 142. The following takes the concave-convex structure 140 at the connection between the glue extrusion section 120 and the forming section 130 as an example for illustration. Refer to Figure 3 , one end of the glue extrusion section 120 close to the forming section 130 is provided with a groove 141. The groove 141 is an annular groove and is coaxially arranged with the glue extrusion section 120. One end of the forming section 130 close to the glue extrusion section 120 is provided with a protrusion 142. The protrusion 142 is an annular protrusion and is coaxially arranged with the forming section 130. The shapes and sizes of the groove 141 on the glue extrusion section 120 and the protrusion 142 on the forming section 130 are matched, so as to ensure that the glue extrusion section 120 and the forming section 130 are firmly connected after the groove 141 and the protrusion 142 are correspondingly assembled, and no relative displacement will occur to affect the product quality.

[0029] An outer periphery at the connection between the glue extrusion section 120 and the forming section 130 is also provided with fasteners. The fasteners include two first flange plates 144. The two first flange plates 144 are respectively sleeved on the end parts of the glue extrusion section 120 and the forming section 130 that are close to each other and then are connected in a matching manner to fix the glue extrusion section 120 and the forming section 130 together. An annular groove is provided on the outer periphery of the end parts of the glue extrusion section 120 and the forming section 130 that are close to each other. External threads are provided in the annular groove. Internal threads are correspondingly arranged on the inner walls of the two first flange plates 144. The two first flange plates 144 are respectively connected to the annular grooves on the outer peripheries of the glue extrusion section 120 and the forming section 130 through threads, and the two first flange plates 144 are arranged in a closely attached manner; a plurality of flange holes 145 are provided on the first flange plates 144. Bolts and other fasteners are passed through the corresponding flange holes 145 on the two first flange plates 144 to fixedly connect the two first flange plates 144, so as to tightly connect the glue extrusion section 120 and the forming section 130. Compared with directly arranging external threads on the outer periphery of the injection mold, arranging the external threads in the annular groove of the injection mold 100 can prevent the external threads from being damaged during the transportation or disassembly of the injection mold 100, affecting the connection between the first flange plates 144, and further affecting the assembly of the injection mold 100. In other embodiments, a protrusion may also be provided on the glue extrusion section and a groove may be provided on the forming section, as long as the glue extrusion section and the forming section can be firmly connected, which is not limited herein.

[0030] Further, in order to improve the sealing effect between the glue extrusion section 120 and the forming section 130, a sealing ring 143 is provided between the groove 141 and the protrusion 142, that is, the sealing ring 143 is arranged between the end faces where the groove 141 and the protrusion 142 are in contact with each other, and the sealing ring 143 abuts against the side wall of the groove 141. Thus, when the glue extrusion section 120 and the forming section 130 are fastened through the first flange plates 144, the sealing ring 143 can be fully squeezed, further enhancing the sealing effect at the connection between the glue extrusion section 120 and the forming section 130. During assembly, first, the two first flange plates 144 are respectively connected to the external threads in the annular grooves on the outer peripheries of the glue extrusion section 120 and the forming section 130; then, the sealing ring 143 is placed in the groove 141 of the glue extrusion section 120, and then the groove 141 of the glue extrusion section 120 and the protrusion 142 of the forming section 130 are connected in a matching manner; finally, bolts and other connecting pieces are correspondingly passed through the flange holes 145 on the two first flange plates 144 to tightly connect the two, so as to tightly connect the glue extrusion section 120 and the forming section 130.

[0031] Continue to refer to Figures 1 to 4 , the glue injection section 110 and the glue extrusion section 120 also adopt a concave-convex structure 140 for fitting connection. The specific structure, connection method and assembly process of the concave-convex structure 140 are as described above and will not be elaborated herein.

[0032] A heating device is provided on the outer periphery of the forming section 130 for heating the yarn impregnated with resin glue in the forming section 130 and curing it to form a pultruded product. The heating device includes a number of heating plates 131, and the number of heating plates 131 can be successively and adjacently covered and arranged on the outer periphery of the forming section 130. Each heating plate 131 includes a first heating plate and a second heating plate. The middle shapes of the first heating plate and the second heating plate match the shape of the outer peripheral surface of the forming section 130, that is, the middles of the first heating plate and the second heating plate can be matched and attached to the outer periphery of the forming section 130 to improve the heat conduction efficiency and quickly provide the heating temperature required for curing and forming the pultruded product; the ends of the first heating plate and the second heating plate that do not fit the forming section 130 are provided with mating mounting holes, and bolts and other fasteners are inserted into the corresponding mounting holes on the first heating plate and the second heating plate to fixedly connect the ends of the first heating plate and the second heating plate, thereby mounting and fixing the heating plate 131 on the outer periphery of the forming section 130.

[0033] In this embodiment, the number of heating plates 131 is three, and the three heating plates 131 have the same size and shape. The forming section 130 is divided into three heating zones, and each heating zone can be heated independently, which is convenient for accurately controlling the temperature of each heating zone according to the curing and forming process requirements of the pultruded product, ensuring the curing effect of the pultruded product and improving the product performance. In other embodiments, the number of heating plates is not limited to three, and can be one, two, or more. The sizes of the heating plates can also be different, and can be adjusted correspondingly according to the forming process requirements of the pultruded product, and no specific limitation is made here.

[0034] A first baffle 132 and a second baffle 133 are respectively provided at both ends of the forming section 130 for fixing the injection mold 100 on the pultrusion equipment. Both the first baffle 132 and the second baffle 133 are hollow square plate-like structures and can be matched and sleeved on the outer periphery of the forming section 130. The first baffle 132 and the second baffle 133 are respectively arranged at both ends of the heating device, so that when the injection mold 100 is installed on the pultrusion equipment, the axis height of the injection mold 100 is the same and it is not easy to roll, effectively preventing the injection mold 100 from generating displacement when pulling the yarn and affecting the product quality. Further, the first baffle 132 and the second baffle 133 can respectively abut against both ends of all the heating plates 131, and can also play a role in fixing the heating plates 131, avoiding the displacement of the heating plates 131 and affecting the curing and forming effect of the pultruded product.

[0035] In this embodiment, the first baffle 132 and the second baffle 133 are threadedly connected to the outer periphery of the forming section 130. An annular groove is provided on the outer periphery of the end of the forming section 130 close to the glue extrusion section 120. The first baffle 133 is composed of two plate members with the same shape. The two plate members are correspondingly and matingly connected in the annular groove on the outer periphery of the end of the forming section 130 close to the glue extrusion section 120. Through holes that cooperate with each other are provided on the two plate members. The first baffle 132 is fixed to the outer periphery of the forming section 130 by passing fasteners such as bolts through the corresponding through holes on the two plate members. An annular groove is provided on the outer periphery of the end of the forming section 130 away from the glue extrusion section 120. External threads are provided in the annular groove. The inner wall of the hollow part of the second baffle 133 is correspondingly provided with internal threads. The second baffle 133 is threadedly connected in the annular groove on the outer periphery of the end of the forming section 130 away from the glue extrusion section 120. Providing the external threads in the annular groove can reduce the damage to the external threads during the transportation or disassembly of the injection mold 100. During assembly, first, the two plate members of the first baffle 133 are buckled on the annular groove on the end of the forming section 130 close to the glue extrusion section 120. Bolts correspondingly pass through the through holes on the two plate members and are tightened in cooperation with nuts to fix the first baffle 132 to the outer periphery of the forming section 130. Then, the second baffle 133 is threadedly connected in the annular groove on the end of the forming section 130 away from the glue extrusion section 120, thereby realizing the installation of the first baffle 132 and the second baffle 133.

[0036] Furthermore, an extension section 134 is provided between the forming section 130 and the glue extrusion section 120, so that there is enough distance between the forming section 130 and the glue extrusion section 120 to ensure that the heat generated by the heating device outside the forming section 130 will not be transferred to the glue extrusion section 120 and the glue injection section 110, preventing the yarn infiltrated with resin glue in the glue extrusion section 120 from curing prematurely before the excess resin glue is extruded, which affects the product quality; and preventing the resin glue in the glue injection section 110 from reacting due to heat and denaturing, making it impossible to infiltrate the yarn, which may further lead to the shutdown of the production line, reducing the production efficiency and increasing the manufacturing cost.

[0037] The resin injection section 110 is connected to a temperature control device (not shown in the figure). The temperature control device adopts a dual temperature control mode and is used to control the temperature of the resin glue in the resin injection section 110. The temperature control device includes a heater (not shown in the figure), a first temperature sensor, and a second temperature sensor. The heater of the temperature control device is connected with an external circuit and an internal circuit. The heater is connected to the first temperature sensor through the external circuit. The first temperature sensor is fixedly arranged in the resin injection section 110 and is used to measure the actual temperature of the resin glue in the resin injection section 110. The temperature control device controls the on-off of the external circuit by comparing the actual temperature measured by the first temperature sensor with the set temperature, and further controls whether the heater heats; the heater is connected to the second temperature sensor through the internal circuit. The second temperature sensor is arranged in the heater and is used to measure the actual temperature inside the heater. The temperature control device controls the on-off of the internal circuit by comparing the actual temperature measured by the second temperature sensor with the temperature upper limit value of the heater, so as to achieve the purpose of protecting the heater. When the actual temperature measured by the first temperature sensor is lower than the set temperature, the external circuit of the temperature control device is closed, and the heater heats the resin glue; when the actual temperature measured by the first temperature sensor is greater than or equal to the set temperature, the external circuit of the temperature control device is disconnected, and the heater stops heating to prevent the resin glue from denaturing due to excessive temperature; and when the temperature measured by the second temperature sensor inside the heater exceeds the temperature upper limit value of the heater, the internal circuit of the temperature control device is disconnected, and the heater stops heating to prevent the heater from malfunctioning due to excessive temperature. The temperature control device adopts a dual temperature control mode. On the one hand, by controlling the on-off of the external circuit, the real-time monitoring and precise control of the temperature of the resin glue in the resin injection section 110 can be realized, so that the resin glue is always in a state with good fluidity and no denaturation, and then the yarn passing through the resin injection section 110 can be fully infiltrated, ensuring the product quality; on the other hand, by the on-off of the internal circuit, the heater can be effectively protected, and the safety is good.

[0038] Refer to Figure 2 and Figure 5, along the pultrusion advancing direction, a detachable yarn threading plate 113 is provided at the entrance of the resin injection section 110, that is, the yarn threading plate 113 is provided at the end of the resin injection section 110 that is not connected to the resin extrusion section 120. The yarn threading plate 113 is a circular plate structure with a certain thickness. When the thickness of the yarn threading plate 113 is small, it is a circular thin plate structure. When the thickness of the yarn threading plate 113 is large, it is a cylindrical structure. The diameter of the yarn threading plate 113 matches the inner diameter of the entrance of the resin injection section 110, facilitating the installation of the yarn threading plate 113 at the entrance of the resin injection section 110. A number of yarn threading holes 114 are provided on the yarn threading plate 113. The yarn threading holes 114 penetrate the axial plate surface of the yarn threading plate 113, and a number of yarn threading holes 114 are evenly distributed along the circumferential direction of the yarn threading plate 113. When threading the yarn, after a number of yarns are led out from the yarn rack, they evenly pass through the yarn threading holes 114 on the yarn threading plate 113 and enter the resin injection section 110 to soak the resin glue. The reasonable setting of the yarn threading holes 114 can enable the yarns to enter the resin injection section 110 evenly to soak the resin glue, effectively avoiding the problem of insufficient soaking caused by the disorder of the yarns. At the same time, it also facilitates the subsequent yarns to enter the resin extrusion section 120 and the forming section 130 in a regular state, ensuring the product quality.

[0039] An installation opening 115 is provided at the entrance of the resin injection section 110 for installing the yarn threading plate 113. An annular groove is formed on the inner wall of the entrance of the resin injection section 110 to form the cylindrical installation opening 115, that is, the diameter of the installation opening 115 is larger than the inner diameter of the main structure of the resin injection section 110 and smaller than the outer diameter of its main structure, and matches the outer diameter of the yarn threading plate 113. A fastener is further provided on the outer periphery of the entrance of the resin injection section 110. The fastener includes a second flange 116 and a third flange 117, which are used for cooperating and connecting to fix the yarn threading plate 113 at the entrance of the resin injection section 110. Among them, the structure of the second flange 116 is similar to that of the first flange 144. The third flange 117 includes a connecting portion and a sealing end portion. The connecting portion is used for sleeving on the outer periphery of the end of the resin injection section 110, and the sealing end portion is used for partially covering the entrance of the resin injection section 110 to prevent the yarn threading plate 113 from falling off. An annular groove is provided on the outer periphery of the entrance of the resin injection section 110, and an external thread is provided in the annular groove. The inner wall of the second flange 116 is correspondingly provided with an internal thread. The second flange 116 is connected to the outer periphery of the resin injection section 110 by a thread. The connecting portion of the third flange 117 is sleeved on the outer periphery of the entrance end of the resin injection section 110, so that the sealing end portion of the third flange 117 abuts against the entrance end face of the resin injection section 110; a number of flange holes are provided on both the connecting portion of the second flange 116 and the third flange 117. By passing bolts and other connecting pieces through the corresponding flange holes on the second flange 116 and the third flange 117, the second flange 116 and the third flange 117 are matched and connected to fix the yarn threading plate 113 in the resin injection section 110. Compared with directly setting the external thread on the outer periphery of the injection mold 100, setting the external thread in the annular groove can reduce the damage of the external thread during the transportation or disassembly of the injection mold 100.

[0040] Furthermore, in order to improve the fastening effect between the yarn threading plate 113 and the glue injection section 110, sealing rings are provided at both axial ends of the yarn threading plate 113. That is, a sealing ring is provided between the contact surface of the plate surface of the yarn threading plate 113 away from the inlet of the glue injection section 110 and the glue injection section 110, and a sealing ring is also provided between the contact surface of the plate surface of the yarn threading plate 113 close to the inlet of the glue injection section 110 and the third flange 117. The sealing ring is coaxially arranged with the yarn threading plate 113 to prevent the yarn threading plate 113 from loosening in the glue injection section 110 and ensure the fastening effect between the yarn threading plate 113 and the glue injection section 110. During assembly, first, the second flange 116 is threadedly connected to the outer periphery of the inlet of the glue injection section 110, then the sealing ring is placed into the glue injection section 110, and then the yarn threading plate 113 is installed into the installation opening 115 in the glue injection section 110, so that the plate surface of the yarn threading plate 113 away from the inlet of the glue injection section 110 abuts against the sealing ring; afterwards, a sealing ring is placed in the third flange 117 and its sealing end presses against the inlet end surface of the glue injection section 110, so that the plate surface of the yarn threading plate 113 close to the inlet of the glue injection section 110 abuts against the sealing ring; finally, bolts and other connecting parts pass through the flange holes on the second flange 116 and the third flange 117 to tightly connect the two, and further fix the yarn threading plate 113 in the glue injection section 110.

[0041] Since the yarn threading plate 113 and the glue injection section 110 are detachably connected, different thicknesses of the yarn threading plate 113 can be replaced at the inlet of the glue injection section 110. During the production process, the yarn will continuously move along the pultrusion forward direction, and the movement of the yarn can inhibit the resin glue in the glue injection section 110 from overflowing from the yarn threading holes 114. That is, the resin glue needs a certain pressure to drive it to overflow from the yarn threading holes 113. By controlling the thickness of the yarn threading plate 113, the pressure required for the resin glue to pass through the yarn threading holes 114 can be controlled. This pressure is defined as the leakage pressure. The greater the thickness of the yarn threading plate 113, the greater the leakage pressure of the resin glue in the glue injection section 110. Conversely, the leakage pressure is smaller. The thickness of the yarn threading plate 113 can be designed and adjusted according to the pultrusion speed during the production process. If the pultrusion speed is small, the inhibitory effect of the movement of the yarn along the pultrusion forward direction on the overflow of the resin glue from the yarn threading holes 114 is weak. Selecting a yarn threading plate 113 with a larger thickness can increase the leakage pressure of the resin glue in the glue injection section 110 and avoid leakage; if the pultrusion speed is large, the inhibitory effect of the movement of the yarn along the pultrusion forward direction on the overflow of the resin glue from the yarn threading holes 114 is strong. Selecting a yarn threading plate 113 with a smaller thickness can avoid the leakage of the resin glue and reduce costs. By controlling the thickness of the yarn threading plate 113 to adjust the leakage pressure of the resin glue, the resin glue in the glue injection section 110 can be prevented from leaking through the yarn threading holes 114 while meeting the yarn wetting requirements, minimizing the leakage amount of the resin glue and reducing waste.

[0042] The diameter of the yarn-passing hole 114 is 1.1 to 1.3 times the diameter of the yarn passing through the yarn-passing hole 114. In this way, after the yarns are respectively arranged in all the yarn-passing holes 114 of the yarn-passing plate 113, on the one hand, a relatively airtight environment can be maintained in the glue injection section 110 to form a better infiltration cavity; on the other hand, without affecting the movement of the yarns in the yarn-passing holes 114, the leakage amount of the resin glue along the yarn-passing holes 114 can be minimized, thereby improving the utilization rate of the resin glue.

[0043] In addition, the yarn-passing plate 113 is detachably connected, so that the yarn-passing plate 113 with a corresponding yarn-passing hole 114 structure can be selected according to the specifications of the pultruded products during actual production, expanding the application range of the injection mold 100, thereby reducing the production cost.

[0044] The beneficial effect of this application is: different from the prior art, the injection mold of this application successively includes a glue injection section, a glue extrusion section and a molding section that are hermetically connected to each other through concave-convex structures. The hermetic connection can prevent the resin glue in the injection mold from being exposed to the air and deteriorating, so that the resin glue always maintains excellent performance to ensure the infiltration effect of the yarns, and further ensure the quality of the pultruded products.

[0045] At the same time, the glue injection section is connected to a temperature control device with a dual temperature control mode, which can control the internal circuit and the external circuit at the same time, can realize the real-time monitoring and precise control of the temperature of the resin glue in the glue injection section, and can also protect the heating device, with good safety.

[0046] In addition, a detachable yarn-passing plate is provided at the installation port of the glue injection section. By installing yarn-passing plates with different thicknesses, the injection mold of this application can control the leakage pressure required for the resin glue to pass through the yarn-passing plate, so that the resin glue in the glue injection section can meet the yarn infiltration requirements and cannot leak through the yarn-passing holes, minimizing the leakage amount of the resin glue and reducing waste.

[0047] The above are only the embodiments of this application, and do not limit the patent scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of this application by the same token.

Claims

1. An injection mold for producing pultruded products, characterized in that: The injection mold is a long straight tubular structure. Along the forward direction of pultrusion, the injection mold sequentially includes a glue injection section, a glue extrusion section and a molding section which are sealed and connected to each other. The glue injection section is used to contain the resin glue and infiltrate the yarn. The glue extrusion section is used to squeeze out the excess resin glue on the passing yarn. The molding section is used to solidify the yarn infiltrated with the resin glue to form the pultruded product. The inner diameter of the glue injection section is larger than the inner diameters of the glue extrusion section and the molding section. A detachable yarn threading plate is provided at the entrance of the glue injection section. A mounting port is provided at the entrance of the glue injection section for installing the yarn threading plate. The diameter of the mounting port matches the outer diameter of the yarn threading plate.

2. The injection mold according to claim 1, characterized in that The glue injection section, the glue extrusion section and the molding section are all connected by using a concave-convex structure.

3. The injection mold according to claim 1, characterized in that Sealing rings are arranged at both axial ends of the yarn threading plate.

4. The injection mold according to claim 1, characterized in that The glue injection section is connected to a temperature control device, and the temperature control device adopts a dual temperature control mode to control the temperature of the resin glue in the glue injection section.

5. The injection mold according to claim 4, characterized in that The temperature control device includes a heater, a first temperature sensor, and a second temperature sensor. The heater is connected to the first temperature sensor via an external circuit. The first temperature sensor is used to measure the actual temperature of the resin glue in the injection section. The heater is connected to the second temperature sensor via an internal circuit. The second temperature sensor is used to measure the actual temperature inside the heater.

6. The injection mold according to claim 1, characterized in that The glue injection section is provided with at least one injection port, and the injection port is located on the top wall of the glue injection section.

7. The injection mold according to claim 1, characterized in that The glue injection section is provided with at least one discharge port, and the discharge port is located on the bottom wall of the glue injection section.

8. The injection mold according to claim 1, characterized in that A heating device is arranged on the periphery of the forming section, and the heating device comprises a plurality of heating plates.

9. The injection mold according to claim 1, characterized in that An extension section is provided between the forming section and the rubber extrusion section.

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