Injection device

Abstract

The utility model discloses an injection device which is used for producing pultrusion products and comprises a glue injection machine and an injection mold, and the injection device injects resin glue liquid into the injection mold through the glue injection machine so that yarn can be infiltrated through the injection mold and cured to form the pultrusion products; the injection mold is of a long straight tubular structure and 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, the glue injection section is used for containing resin glue liquid and infiltrating yarn, the glue extrusion section is used for extruding redundant resin glue liquid on the passing yarn, and the forming section is used for curing the yarn infiltrated with the resin glue liquid to form a pultrusion product. The inner diameter of the glue injection section is larger than the inner diameter of the glue extrusion section and the inner diameter of the forming section, and a detachable yarn threading plate is arranged at an inlet of the glue injection section. The injection device can control the pressure needed by the resin glue solution to pass through the threading plate, 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 molding equipment, and in particular to an injection device. Background Art

[0002] In the field of pultrusion technology, an open impregnation device is usually used to contain resin glue and impregnate 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 impregnation effect of the yarn and thus affecting the product quality. The injection pultrusion technology can be used to impregnate the yarn in a closed environment, but the existing injection mold has a complex structure and irregular shape, which is difficult to process. In addition, the yarn inlet size of the injection mold is too large to form a good closed impregnation cavity, resulting in excess resin glue overflowing and dripping from the yarn inlet, causing waste and pollution. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide an injection device with a simple structure and easy manufacturing. By replacing the yarn threading plates with different thicknesses, the leakage pressure of the resin glue in the injection section can be controlled, thereby effectively avoiding the waste and pollution caused by the leakage of the resin glue from the yarn threading holes.

[0004] In order to solve the above technical problems, the technical solution adopted in this application is: to provide an injection device for producing pultruded products, including a glue injection machine and an injection mold, the injection device injects resin glue into the injection mold through the glue injection machine, so that the yarn is infiltrated and solidified into a pultruded product through the injection mold; the injection mold is a long straight tubular structure, along the pultrusion forward direction, the injection mold includes a glue injection section, a glue extrusion section and a molding section that are sealed and connected to each other in sequence, 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, and the molding section is used to solidify the yarn infiltrated with the resin glue to form a pultruded product, the inner diameter of the glue injection section is larger than the inner diameter of the glue extrusion section and the molding section, and a detachable yarn feeding plate is provided at the entrance of the glue injection section. By installing yarn feeding plates of different thicknesses, the leakage pressure required for the resin glue to pass through the yarn feeding plate is controlled, so that the resin glue in the glue injection section can meet the yarn infiltration requirements while not leaking through the yarn feeding hole, which can minimize the leakage of the resin glue and reduce waste.

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

[0006] The concave-convex structure includes a groove and a convexity, and a sealing ring is arranged between the groove and the convexity, so as to further improve the sealing effect of the connection between the injection section, the extrusion section and the molding section.

[0007] The threading board is provided with evenly distributed threading holes. The yarn passes through the threading holes, so that the yarn is evenly distributed and enters the injection section to be infiltrated with resin glue, effectively avoiding the problem of insufficient infiltration caused by disordered yarns. At the same time, it is also convenient for the subsequent yarn to maintain a regular state and enter the extrusion section and molding section to ensure product quality.

[0008] The diameter of the threading hole is 1.1 to 1.3 times the diameter of the yarn passing through the threading hole. On the one hand, the injection section can maintain a relatively closed environment to form a better infiltration cavity; on the other hand, the leakage of the resin glue along the threading hole can be minimized without affecting the movement of the yarn in the threading hole, thereby improving the utilization rate of the resin glue.

[0009] The injection section is connected to a temperature control device, which adopts a dual temperature control mode to control the temperature of the resin glue in the injection section. The dual temperature control mode can realize real-time monitoring and precise control of the temperature of the resin glue in the injection section, so that the resin glue is in a state of good fluidity and no invariance.

[0010] The glue injection section is provided with at least one injection port, and the glue injection machine injects resin glue into the glue injection section through the injection port. The injection port is connected to a pressure sensor for detecting the pressure of the resin glue in the glue injection section and feeding it back to the control system of the glue injection machine.

[0011] The injection section is provided with at least one discharge port for recovering the resin glue remaining in the injection section after the production is completed, thereby improving the material utilization rate.

[0012] Among them, the glue injection machine includes: a frame, a driving mechanism and a glue storage container. The glue storage container is arranged on the frame, and the driving mechanism is retractably arranged in the receiving cavity of the glue storage container. The glue storage container is connected with a feed valve and a discharge valve. The driving mechanism can be partially extended or extended into the receiving cavity, and is used to absorb the resin glue into the receiving cavity through the feed valve, or inject the resin glue in the receiving cavity into the injection mold through the discharge valve.

[0013] Among them, the glue injection machine adopts a constant pressure or constant speed mode to inject the resin glue into the injection mold, so that the resin glue in the injection section can achieve a better infiltration effect.

[0014] The beneficial effects of the present application are as follows: different from the prior art, the injection device of the present application includes a glue injection machine and an injection mold, the overall structure is simple and easy to manufacture; 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 through a concave-convex structure, and the sealed 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 wetting effect of the yarn, thereby ensuring the quality of the pultruded product.

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

[0016] In addition, the installation port of the injection section is provided with a detachable yarn threading plate. By installing yarn threading plates of different thicknesses, the injection device of the present application can control the leakage pressure required for the resin glue to pass through the yarn threading plate, so that the resin glue in the injection section can meet the yarn infiltration requirements while not being able to leak through the yarn threading hole, thereby minimizing the leakage of the resin glue and reducing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

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

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

[0020] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

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

[0022] Figure 5 is a front view of the threading plate 113 in one embodiment of the present application;

[0023] Figure 6 It is a structural schematic diagram of a glue injection machine 200 in one embodiment of the present application. DETAILED DESCRIPTION

[0024] 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 application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] See also Figures 1 to 6The present application provides an injection device for producing pultruded products. The injection device includes an injection mold 100 and a glue injection machine 200. The injection device injects resin glue into the injection mold 100 through the glue injection machine 200, so that the yarn is infiltrated and solidified through the injection mold 100 to form a pultruded product; the injection mold 100 is a long straight tubular structure, which has a regular shape, is easy to process, and reduces the processing cost. Along the pultrusion forward direction, that is, Figure 1 In the X direction marked in the figure, the injection mold 100 includes a glue injection section 110, a glue extrusion section 120 and a molding section 130 which are sealed and connected to each other. The glue injection section 110, the glue extrusion section 120 and the molding section 130 are sealed and connected to each other, so that the injection mold 100 can maintain a relatively closed environment, avoid the resin glue in the injection mold 100 from being exposed to the air and deteriorating, and keep the resin glue excellent. The quality of the pultruded product can also be guaranteed. At the same time, the resin glue can be prevented from leaking from the connection between the glue injection section 110, the glue extrusion section 120 and the molding section 130, thereby increasing the utilization rate of the resin glue and reducing waste. The glue injection section 110 is used to contain the resin glue and infiltrate the yarn, the glue extrusion section 120 is used to squeeze out the excess resin glue on the yarn, and the molding section 130 is used to solidify the yarn infiltrated with the resin glue to form a pultruded product. The inner diameter of the injection section 110 is larger than the inner diameters of the extrusion section 120 and the molding section 130, so that the yarn can squeeze out excess resin glue when entering the extrusion section 120 after being soaked in resin glue through the injection section 110, and can be formed into a pultruded product after being preformed in the extrusion section 120 and being cured at high temperature when entering the molding section 130. A detachable threading plate 113 is provided at the entrance of the injection section 110, so that the leakage pressure required for the resin glue to pass through the threading plate 113 can be controlled by installing threading plates 113 of different thicknesses, so that the resin glue in the injection section 110 can meet the yarn soaking requirements while not leaking through the threading holes 114, which can minimize the leakage of the resin glue and reduce waste.

[0026] See also Figures 1 to 4In this embodiment, the injection section 110, the extrusion section 120 and the molding section 130 are all long straight tubular structures, and are all round tubes, and their outer diameters are roughly equal, which is convenient for the processing and assembly of the injection mold 100. The three are coaxially arranged, which is convenient for the yarn to pass smoothly without bending and damage, and can effectively ensure the quality of the finished pultruded product. The extrusion section 120 and the molding section 130 are used for preforming and heat curing pultruded products, respectively, and their inner diameters are set to be equal to the outer diameter of the pultruded product of the corresponding specifications of the injection mold 100. The inner diameter of the injection section 110 is set to be larger than the inner diameters of the extrusion section 120 and the molding section 130, that is, the inner diameter of the injection section 110 is larger than the outer diameter of the pultruded product produced, which can ensure that the injection section 110 can accommodate enough resin glue to fully infiltrate all the yarns passing through the injection section 110, so that the yarns obtain a good infiltration effect, thereby ensuring product quality. The inner diameters of the glue extrusion section 120 and the molding section 130 are set equal to the outer diameter of the pultruded product to be produced. On the one hand, the inner diameter of the glue extrusion section 120 is smaller than the glue injection section 110, so that when the yarn soaked in resin glue enters the glue extrusion section 120, the excess resin glue on the yarn can be squeezed out and the bubbles brought into the yarn can be discharged, thereby ensuring that the resin content of the pultruded product meets the requirements while avoiding the presence of bubbles inside the product, which affects the product performance; on the other hand, the inner diameters of the glue extrusion section 120 and the molding section 130 are equal, and the soaked yarn can be directly cured at high temperature to form a pultruded product when it enters the molding section 130 after being preformed by the glue extrusion section 120, thereby improving production efficiency. In other embodiments, the glue injection section, the glue extrusion section and the molding section can also be square tubes or tubular structures of other shapes, and the size of their inner diameters and outer diameters can also be adjusted according to the production requirements of the pultruded product, which is not limited here.

[0027] In this embodiment, the glue injection section 110 is provided with an injection port 111, which is located on the top wall of the glue injection section 110. The injection port 111 is connected to the glue injection machine 200 through a glue delivery pipe (not shown in the figure), and is used to inject the resin glue in the glue injection machine 200 into the glue injection section 110 through the glue delivery pipe. The injection port 111 is located on the top wall of the glue injection section 110 to facilitate filling the resin glue in the glue injection section 110, and can effectively prevent the resin glue from overflowing from the injection port 111 during the injection process. In other embodiments, the glue injection section can also be provided with two, three or more injection ports, and the number and setting position of the injection ports can be adjusted according to the production requirements of the pultruded products, and are not limited here.

[0028] In this embodiment, the injection section 110 is provided with a discharge port 112, which is located on the bottom wall of the injection section 110. The discharge port 112 is connected to a resin glue recovery device (not shown in the figure) through a discharge pipe (not shown in the figure), and is used to recover the resin glue remaining in the injection section 110 after the production is completed, thereby improving the material utilization rate. The discharge port 112 is located on the bottom wall of the injection section 110, so that the resin glue remaining in the injection section 110 after the production is completed can be discharged smoothly from the discharge port 112, which is convenient for emptying the injection section 110. In other embodiments, the injection section can also be provided with two, three or more discharge ports, and the number and setting position of the discharge ports can be adjusted according to the production requirements of the pultruded products, and there is no limitation here.

[0029] The injection section 110, the extrusion section 120 and the molding section 130 are all connected by a concave-convex structure 140, and the concave-convex structure 140 includes a groove 141 and a protrusion 142. The concave-convex structure 140 at the connection between the extrusion section 120 and the molding section 130 is used as an example for description. Figure 3 A groove 141 is provided at one end of the glue extrusion section 120 close to the forming section 130. The groove 141 is an annular groove and is coaxially arranged with the glue extrusion section 120. A protrusion 142 is provided at one end of the forming section 130 close to the glue extrusion section 120. The protrusion 142 is an annular protrusion and is coaxially arranged with the forming section 130. The groove 141 on the glue extrusion section 120 and the protrusion 142 on the forming section 130 match in shape and size, thereby ensuring 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 product quality.

[0030] A fastener is also provided at the periphery of the connection between the extruding section 120 and the forming section 130. The fastener includes two first flanges 144. The two first flanges 144 are respectively sleeved on the ends of the extruding section 120 and the forming section 130 that are close to each other and then matched and connected to fix the extruding section 120 and the forming section 130 together. An annular groove is provided at the periphery of the ends of the extruding section 120 and the forming section 130 that are close to each other. The annular groove is provided with an external thread. The inner walls of the two first flanges 144 are correspondingly provided with internal threads. The two first flanges 144 are respectively connected to the annular grooves of the periphery of the extruding section 120 and the forming section 130 by threads, and the two first flanges 144 are closely arranged; a plurality of flange holes 145 are provided on the first flange 144. The two first flanges 144 are fixedly connected by fasteners such as bolts inserted through the corresponding flange holes 145 on the two first flanges 144, thereby fastening the extruding section 120 and the forming section 130. Compared with the external thread being directly provided on the periphery of the injection mold, the external thread being provided in the annular groove of the injection mold 100 can prevent the external thread from being damaged during transportation or disassembly of the injection mold 100, thereby affecting the connection between the first flanges 144 and further affecting the assembly of the injection mold 100. In other embodiments, a protrusion may be provided on the extrusion section and a groove may be provided on the molding section, as long as the extrusion section and the molding section can be firmly connected, and no limitation is made here.

[0031] Furthermore, in order to improve the sealing effect between the glue extrusion section 120 and the molding section 130, a sealing ring 143 is arranged between the groove 141 and the protrusion 142, that is, the sealing ring 143 is arranged between the end surfaces of the groove 141 and the protrusion 142 that contact each other, and the sealing ring 143 abuts against the side wall of the groove 141, so that when the glue extrusion section 120 and the molding section 130 are fastened by the first flange 144, the sealing ring 143 can be fully squeezed, thereby further improving the sealing effect at the connection between the glue extrusion section 120 and the molding section 130. During assembly, firstly, the two first flanges 144 are connected to the external threads in the annular grooves on the outer peripheries of the glue extrusion section 120 and the molding section 130 respectively; then, a 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 molding section 130 are matched and connected; finally, bolts and other connecting parts are used to pass through the flange holes 145 on the two first flanges 144 to fasten the two together, thereby fastening the glue extrusion section 120 and the molding section 130 together.

[0032] Continue reading Figures 1 to 4 The glue injection section 110 and the glue extrusion section 120 are also connected by the concave-convex structure 140. The specific structure, connection method and assembly process of the concave-convex structure 140 are as described above and will not be repeated here.

[0033] A heating device is provided on the periphery of the forming section 130, which is used to heat the yarn soaked with resin glue in the forming section 130 and solidify it to form a pultruded product. The heating device includes a plurality of heating plates 131, which can be arranged adjacently and sequentially on the periphery of the forming section 130, each of which includes a first heating plate and a second heating plate, the middle shape of the first heating plate and the second heating plate matches the shape of the outer peripheral surface of the forming section 130, that is, the middle of the first heating plate and the second heating plate can match and fit the periphery of the forming section 130, improve the heat conduction efficiency, and quickly provide the heating temperature required for solidifying the pultruded product; the ends of the first heating plate and the second heating plate that are not in contact with the forming section 130 are provided with mutually matching 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 fix the ends of the first heating plate and the second heating plate, so that the heating plate 131 is installed and fixed on the periphery of the forming section 130.

[0034] In this embodiment, the number of heating plates 131 is three, and the three heating plates 131 are of the same size and shape, and the forming section 130 is divided into three heating zones, each of which can be heated independently, so as to accurately control the temperature of each heating zone according to the curing and forming process requirements of the pultruded product, ensure the curing effect of the pultruded product, and improve the product performance. In other embodiments, the number of heating plates is not limited to three, and can be one, two, or more, and the size of the heating plates can also be different, and can be adjusted accordingly according to the forming process requirements of the pultruded product, and no specific restrictions are made here.

[0035] The first baffle 132 and the second baffle 133 are respectively provided at both ends of the molding section 130, which are used to fix the injection mold 100 on the pultrusion equipment. The first baffle 132 and the second baffle 133 are both hollow square plate structures, which can be matched and sleeved on the outer periphery of the molding section 130. The first baffle 132 and the second baffle 133 are respectively arranged at the two 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 consistent, and it is not easy to roll, which effectively prevents the injection mold 100 from being displaced when pulling the yarn and affecting the product quality. Furthermore, the first baffle 132 and the second baffle 133 can respectively abut the two ends of all the heating plates 131, and can also play the role of fixing the heating plates 131 to prevent the heating plates 131 from being displaced and affecting the curing molding effect of the pultruded product.

[0036] In this embodiment, the first baffle 132 and the second baffle 133 are connected to the outer periphery of the molding section 130 by threads, and an annular groove is provided at the outer periphery of the end of the molding section 130 close to the glue extrusion section 120. The first baffle 133 is composed of two plates of the same shape, and the two plates are matched and connected in the annular groove at the outer periphery of the end of the molding section 130 close to the glue extrusion section 120. The two plates are provided with through holes that match each other, and the first baffle 132 is fixed to the outer periphery of the molding section 130 by inserting fasteners such as bolts through the corresponding through holes on the two plates. An annular groove is provided at the outer periphery of the end of the molding section 130 away from the glue extrusion section 120, and an external thread is provided in the annular groove. The inner wall of the hollow part of the second baffle 133 is correspondingly provided with an internal thread. The second baffle 133 is connected to the annular groove at the outer periphery of the end of the molding section 130 away from the glue extrusion section 120 by threads. The external thread is provided in the annular groove to reduce the damage of the external thread during transportation or disassembly of the injection mold 100. During assembly, firstly, the two plates of the same shape of the first baffle 133 are buckled into the annular groove on the end of the forming section 130 close to the glue extrusion section 120, the bolts are passed through the through holes on the two plates and tightened with the nuts to fix the first baffle 132 to the outer periphery of the forming section 130, and then the second baffle 133 is threadedly connected to 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.

[0037] Furthermore, an extension section 134 is provided between the molding section 130 and the glue extrusion section 120, so that there is a sufficient distance between the molding section 130 and the glue extrusion section 120, ensuring that the heat generated by the heating device outside the molding section 130 will not be transferred to the glue extrusion section 120 and the glue injection section 110, thereby preventing the yarn soaked in the resin glue in the glue extrusion section 120 from solidifying prematurely before the excess resin glue is squeezed out, thereby affecting the product quality; and preventing the resin glue in the glue injection section 110 from reacting due to heat, causing denaturation and being unable to soak the yarn, thereby causing the production line to stop, reducing production efficiency and increasing manufacturing costs.

[0038] The glue 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 to control the temperature of the resin glue in the glue 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 to 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 glue injection section 110 to measure the actual temperature of the resin glue in the glue 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, thereby controlling whether the heater is heated; the heater is connected to the second temperature sensor through the internal circuit. The second temperature sensor is arranged in the heater 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 upper temperature limit of the heater, thereby achieving 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 liquid; 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 liquid from being overheated and causing denaturation; and when the temperature inside the heater measured by the second temperature sensor exceeds the upper temperature limit of the heater, the internal circuit of the temperature control device is disconnected, and the heater stops heating to prevent the heater from being overheated and causing malfunction. The temperature control device adopts a dual temperature control mode. On the one hand, by controlling the on-off of the external circuit, it can realize real-time monitoring and precise control of the temperature of the resin glue liquid in the injection section 110, so that the resin glue liquid is always in a state of good fluidity and no invariance, so that the yarn passing through the injection section 110 can be fully infiltrated to ensure 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.

[0039] See also Figure 2 and Figure 5, along the pultrusion forward direction, a detachable threading plate 113 is provided at the entrance of the injection section 110, that is, the end of the injection section 110 that is not connected to the extrusion section 120 is provided with a threading plate 113, and the threading plate 113 is a circular plate structure with a certain thickness. When the thickness of the threading plate 113 is small, it is a circular thin plate structure, and when the thickness of the threading plate 113 is large, it is a cylindrical structure. The diameter of the threading plate 113 matches the inner diameter at the entrance of the injection section 110, so that the threading plate 113 is convenient to be installed at the entrance of the injection section 110. The threading plate 113 is provided with a plurality of threading holes 114, which penetrate the axial plate surface of the threading plate 113, and the plurality of threading holes 114 are evenly distributed along the circumferential direction of the threading plate 113. When threading, after being drawn out from the yarn rack, a number of yarns evenly pass through the threading holes 114 on the threading plate 113 and enter the glue injection section 110 to be infiltrated with the resin glue. The reasonable setting of the threading holes 114 can make the yarns evenly distributed to enter the glue injection section 110 to be infiltrated with the resin glue, effectively avoiding the problem of insufficient infiltration caused by the disorder of the yarns, and at the same time, it is convenient for the subsequent yarns to maintain a regular state to enter the glue squeezing section 120 and the molding section 130, thereby ensuring product quality.

[0040] An installation opening 115 is provided at the entrance of the injection section 110 for installing the threading plate 113. An annular groove is provided on the inner wall at the entrance of the injection section 110 to form an installation opening 115 of a cylindrical structure, that is, the diameter of the installation opening 115 is larger than the inner diameter of the main structure of the injection section 110 and smaller than the outer diameter of its main structure, and matches the outer diameter of the threading plate 113. A fastener is also provided at the outer periphery of the entrance of the injection section 110, and the fastener includes a second flange 116 and a third flange 117, which are used to cooperate and connect to fix the threading plate 113 at the entrance of the injection section 110, wherein the structure of the second flange 116 is similar to that of the first flange 144, and the third flange 117 includes a connecting portion and a sealing end portion, the connecting portion is used to be sleeved on the outer periphery of the end of the injection section 110, and the sealing end portion is used to partially cover the entrance of the injection section 110 to prevent the threading plate 113 from falling. An annular groove is provided at the outer periphery of the entrance of the injection section 110, and an external thread is provided in the annular groove. An internal thread is correspondingly provided on the inner wall of the second flange 116. The second flange 116 is connected to the outer periphery of the injection section 110 by threads, and the connecting portion of the third flange 117 is sleeved on the outer periphery of the entrance end of the injection section 110, so that the sealing end of the third flange 117 abuts against the entrance end face of the injection section 110; a plurality of flange holes are provided on the connecting portions of the second flange 116 and the third flange 117, and bolts and other connecting members are inserted into the corresponding flange holes on the second flange 116 and the third flange 117 to match and connect the second flange 116 and the third flange 117, so as to fix the threading plate 113 in the injection section 110. Compared with the external thread being directly provided on the outer periphery of the injection mold 100, the external thread being provided in the annular groove can reduce the damage of the external thread during transportation or disassembly of the injection mold 100.

[0041] 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 plate surface of the yarn threading plate 113 away from the entrance of the glue injection section 110 and the contact surface of the glue injection section 110, and a sealing ring is also provided between the plate surface of the yarn threading plate 113 close to the entrance of the glue injection section 110 and the contact surface of 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, thereby ensuring the fastening effect of the yarn threading plate 113 and the glue injection section 110. During assembly, firstly, the second flange 116 is connected to the outer periphery of the entrance of the injection section 110 through threads, then the sealing ring is placed in the injection section 110, and then the threading plate 113 is installed in the installation port 115 in the injection section 110, so that the threading plate 113 is away from the plate surface at the entrance of the injection section 110 and abuts against the sealing ring; then, the sealing ring is placed in the third flange 117 and its sealing end is pressed against the entrance end face of the injection section 110, so that the threading plate 113 is close to the plate surface at the entrance of the injection section 110 and abuts against the sealing ring; finally, the flange holes on the second flange 116 and the third flange 117 are penetrated by bolts and other connecting parts, and the two are fastened together, thereby fixing the threading plate 113 in the injection section 110.

[0042] Since the threading plate 113 is detachably connected to the glue injection section 110, threading plates 113 of different thicknesses can be replaced at the entrance of the glue injection section 110. During the production process, the yarn will continue to 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 threading hole 114, that is, the resin glue needs a certain pressure to drive it to overflow from the threading hole 113. By controlling the thickness of the threading plate 113, the pressure required for the resin glue to pass through the threading hole 114 can be controlled. This pressure is defined as the leakage pressure. The greater the thickness of the threading plate 113, the greater the leakage pressure of the resin glue in the glue injection section 110, and vice versa, the smaller the leakage pressure. The thickness of the threading plate 113 can be designed and adjusted according to the pultrusion speed in the production process. If the pultrusion speed is low, the movement of the yarn along the pultrusion forward direction has a weak inhibitory effect on the overflow of the resin glue from the threading hole 114. Selecting a threading plate 113 with a larger thickness can increase the leakage pressure of the resin glue in the injection section 110 to avoid leakage; if the pultrusion speed is high, the movement of the yarn along the pultrusion forward direction has a strong inhibitory effect on the overflow of the resin glue from the threading hole 114. Selecting a threading plate 113 with a smaller thickness can avoid leakage of the resin glue and reduce costs. By controlling the thickness of the threading plate 113 to adjust the leakage pressure of the resin glue, the resin glue in the injection section 110 can be prevented from leaking through the threading hole 114 while meeting the yarn infiltration requirements, thereby minimizing the leakage of the resin glue and reducing waste.

[0043] The diameter of the yarn threading hole 114 is 1.1 to 1.3 times the diameter of the yarn passing through the yarn threading hole 114. In this way, after the yarn is respectively passed through all the yarn threading holes 114 of the yarn threading plate 113, on the one hand, the glue injection section 110 can maintain a relatively closed environment to form a better infiltration cavity; on the other hand, it can also minimize the leakage of resin glue along the yarn threading hole 114 without affecting the movement of the yarn in the yarn threading hole 114, thereby improving the utilization rate of the resin glue.

[0044] In addition, the threading plate 113 is detachably connected, so that in actual production, a threading plate 113 with a corresponding threading hole 114 structure can be selected according to the specifications of the pultruded product, thereby expanding the application range of the injection mold 100 and reducing production costs.

[0045] See also Figure 6 The glue injection machine 200 includes a frame 210, a driving mechanism 220 and a glue storage container 230. The glue storage container 230 is arranged on the frame 210 and is used to store the resin glue to be injected into the injection mold 100. The driving mechanism 220 is retractably arranged in a receiving cavity 231 (the mark in the figure is only for reference) of the glue storage container 230. The driving mechanism 220 and the glue storage container 230 form a piston structure. The glue storage container 230 is connected to a feed valve 232 through a glue input pipe (not shown in the figure). When the feed valve 232 is opened, the external resin glue can enter the glue storage container 230 through the glue input pipe; when the feed valve 232 is closed, the resin glue stops entering the glue storage container 230. The glue storage container 230 is connected to the discharge valve 233 through a glue delivery pipe (not shown in the figure). When the discharge valve 233 is opened, the resin glue in the glue storage container 230 enters the injection mold 100 through the glue delivery pipe; when the discharge valve 233 is closed, the resin glue stops entering the injection mold 100. The driving mechanism 220 can partially extend out or extend into the accommodating chamber 231 to provide the driving force required for feeding or discharging the resin glue. When feeding, the feed port of the glue input pipe is set in the external resin glue, and the feed valve 232 is opened. At this time, the driving mechanism 220 partially extends out of the accommodating chamber 231, so that a negative pressure is formed in the accommodating chamber 231. The external resin glue enters the accommodating chamber 231 through the glue input pipe under the action of atmospheric pressure until the feeding is completed and the feed valve 232 is closed; when discharging, the discharge port of the glue delivery pipe is connected to the injection port 111 of the glue injection section 110, and the discharge valve 233 is opened. The driving mechanism 220 partially extends into the accommodating chamber 231, and the resin glue in the accommodating chamber 231 can be driven to enter the glue injection section 110 until the glue injection is completed and the discharge valve 233 is closed. In actual production, the amount of resin glue injected by the glue injection machine 200 into the injection mold 100 can be controlled according to the production data of the corresponding specification product. Transporting the resin glue liquid through the glue liquid input pipe and the glue liquid delivery pipe can prevent the external environment from contaminating the resin glue liquid, causing the resin glue liquid to deteriorate, thereby affecting product quality.

[0046] The glue injection machine 200 injects resin glue into the glue injection section 110 through the injection port 111. The injection port 111 is connected to a pressure sensor for detecting the pressure of the resin glue in the glue injection section 110 and feeding it back to the control system of the glue injection machine 200. The glue injection machine 200 can adjust the pressure of the resin glue in the glue injection section 110 by adjusting the glue injection speed. The glue injection machine 200 uses a constant pressure or constant speed mode to inject resin glue into the injection mold 100. During the injection process in the constant pressure mode, the pressure of the resin glue in the glue injection section 110 fluctuates around the set pressure value according to a certain tolerance, so that the resin glue in the glue injection section 110 can achieve a better infiltration effect on the yarn. During injection, the set pressure value of the glue injection is first input into the control system of the glue injection machine 200, and then the pressure of the resin glue in the glue injection section 110 is adjusted according to the feedback pressure value of the pressure sensor and the set pressure value. When the feedback pressure value is greater than the set pressure value, the glue injection machine 200 reduces the speed of the driving mechanism 220 extending into the accommodating chamber 231 to reduce the glue injection speed, thereby reducing the pressure of the resin glue in the glue injection section 110; when the feedback pressure value is less than the set pressure value, the glue injection machine 200 increases the speed of the driving mechanism 220 extending into the accommodating chamber 231 to increase the glue injection speed, thereby increasing the pressure of the resin glue in the glue injection section 110, so that the pressure of the resin glue in the glue injection section 110 always meets the yarn impregnation requirement. In the constant speed mode injection process, the set speed value of the glue injection is first input into the control system of the glue injection machine 200, and then the glue injection machine 200 extends the driving mechanism 220 into the accommodating chamber 231 at a constant speed according to the set speed value, so that the glue enters the glue injection section 110 at a constant speed, which can always keep a sufficient amount of resin glue in the glue injection section 110 to ensure the yarn impregnation effect.

[0047] The injection device of the present application can be used in a pultrusion production line to produce pultruded products. The injection pultrusion molding method of the present application comprises the following steps:

[0048] S1: Lead a number of yarns from the creel and thread them into the injection mold.

[0049] In this step, the yarn on the yarn rack is led out and uniformly passes through a plurality of yarn passing holes 114 on the yarn passing plate 113 to enter the injection mold 100, and passes through the injection section 110, the extrusion section 120 and the molding section 130 in sequence.

[0050] Before this step, it is necessary to select a threading plate 113 of appropriate thickness and install it at the entrance of the injection section 110, that is, select a threading plate 113 of appropriate thickness according to the pultrusion speed required for production to ensure that the leakage of resin glue along the threading hole 114 can be minimized and its leakage pressure can be controlled. Specifically, first, the second flange 116 is connected to the outer periphery of the entrance of the glue injection section 110 through threads, and then the sealing ring is placed in the glue injection section 110, and then the threading plate 113 is installed in the installation port 115 in the glue injection section 110, so that the threading plate 113 is away from the plate surface at the entrance of the glue injection section 110 and abuts against the sealing ring; then, the sealing ring is placed in the third flange 117 and its sealing end is pressed against the entrance end face of the glue injection section 110, so that the threading plate 113 is close to the plate surface at the entrance of the glue injection section 110 and abuts against the sealing ring; finally, the flange holes on the second flange 116 and the third flange 117 are penetrated by bolts and other connecting parts, and the two are fastened together, thereby realizing the installation of the threading plate 113.

[0051] S2: using the injection machine of the injection device to inject resin glue into the injection section of the injection mold.

[0052] Prior to this step, the control system of the glue injection machine 200 obtains production data of the pultruded product, including parameters such as the composition of the resin glue, the pulling speed of the yarn, the heating temperature of the resin glue, and the injection mode.

[0053] Before this step, a sufficient amount of resin glue liquid needs to be stored in the glue injection machine 200, that is, the resin glue liquid needs to be sucked in advance. Specifically, the control system of the glue injection machine 200 controls the feed valve 232 to open according to the obtained production data, and controls the drive mechanism 220 to partially extend out of the accommodating chamber 231, so that a negative pressure is formed in the accommodating chamber 231. Under the action of atmospheric pressure, the external resin glue liquid enters the accommodating chamber 231 through the glue liquid input pipe and the feed valve 232 in sequence, until the resin glue liquid stored in the glue injection machine 200 meets the requirements; after the feeding is completed, the drive mechanism 220 is controlled to partially extend into the accommodating chamber 231, and the gas in the accommodating chamber 231 is pushed out and the feed valve 232 is closed.

[0054] In this step, the glue injection machine 200 injects the resin glue into the glue injection section 110 during the yarn pulling process. Specifically, the control system of the glue injection machine 200 controls the discharge valve 233 to open according to the obtained production data, and controls the driving mechanism 220 to partially extend into the accommodating chamber 231, and drives the resin glue in the accommodating chamber 231 to be injected into the glue injection section 110 in a constant speed mode or a constant pressure mode through the discharge valve 233, the glue delivery pipe, and the injection port 111 in sequence, until the resin glue in the glue injection section 110 can fully infiltrate the yarn, the glue injection is completed, and the control system controls the discharge valve 233 to close. During the production process, if the resin glue in the glue injection section 110 is insufficient, the control system repeats the aforementioned steps, which will not be repeated.

[0055] S3: The yarn is soaked in resin liquid in the injection section and then enters the extrusion section to form a preform of the pultruded product.

[0056] In this step, the temperature control device provides the temperature in the production data to keep the resin glue liquid in a state of good fluidity and no invariance, thereby ensuring the wetting effect of the yarn. The yarn soaked with the resin glue liquid enters the glue extrusion section 120, where the excess resin glue liquid on the yarn is squeezed out and initially formed to form a preform of the pultruded product.

[0057] Before this step, the temperature control device needs to control the temperature of the resin glue in the injection section 110 to meet the infiltration requirements. Specifically, the heater of the temperature control device is connected to the first temperature sensor through an external circuit, and the temperature control device controls the heater to heat the resin glue in the injection section 110. The first temperature sensor measures the actual temperature of the resin glue in the injection section 110. When the actual temperature measured by the first temperature sensor is lower than the set temperature, the heater is controlled to continue to heat the resin glue; when the actual temperature measured by the first temperature sensor is greater than or equal to the set temperature, the heater is controlled to stop heating. During the heating process, the heater and the second temperature sensor are always connected through an internal circuit. The second temperature sensor measures the actual temperature inside the heater. When the second temperature sensor measures that the temperature inside the heater exceeds the upper temperature limit of the heater, the heater is controlled to stop heating.

[0058] S4: The preform enters the forming section and is cured at high temperature to form a pultruded product, and the pultruded product is pulled by a traction device to move along the pultrusion forward direction, and the pultruded product is continuously formed.

[0059] In this step, the preform enters the molding section 130, that is, the yarn soaked in resin glue is passed through the tubular inner cavity of the molding section 130, and is cured and molded at high temperature to obtain a pultruded product. The traction device continuously pulls the pultruded product, so that the soaked yarn continuously enters the molding section 130, and the cured pultruded product is continuously pulled out of the molding section 130 and moves forward, and production is uninterrupted.

[0060] The beneficial effects of the present application are as follows: different from the prior art, the injection device of the present application includes a glue injection machine and an injection mold, the overall structure is simple and easy to manufacture; 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 through a concave-convex structure, and the sealed 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 wetting effect of the yarn, thereby ensuring the quality of the pultruded product.

[0061] At the same time, the injection section is connected to a temperature control device with dual temperature control modes, which can control the internal circuit and the external circuit at the same time, and can realize real-time monitoring and precise control of the temperature of the resin glue in the injection section, and can also protect the heating device, with good safety.

[0062] In addition, the installation port of the injection section is provided with a detachable yarn threading plate. By installing yarn threading plates of different thicknesses, the injection device of the present application can control the leakage pressure required for the resin glue to pass through the yarn threading plate, so that the resin glue in the injection section can meet the yarn infiltration requirements while also being unable to leak through the yarn threading hole, thereby minimizing the leakage of the resin glue and reducing waste.

[0063] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An injection device for producing pultruded products, characterized in that: It comprises a glue injection machine and an injection mold, wherein the injection device injects resin glue into the injection mold through the glue injection machine, so that the yarn is infiltrated through the injection mold and solidified to form the pultruded product; The injection mold is a long straight tubular structure. Along the forward direction of pultrusion, the injection mold includes a glue injection section, a glue extrusion section and a molding section which are sealed and connected to each other in sequence. 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.

2. The injection device 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 device according to claim 2, characterized in that The concave-convex structure includes a concave groove and a convexity, and a sealing ring is arranged between the concave groove and the convexity.

4. The injection device according to claim 1, characterized in that The yarn threading plate is provided with yarn threading holes which are evenly distributed.

5. The injection device according to claim 4, characterized in that The diameter of the yarn threading hole is 1.1 to 1.3 times the diameter of the yarn passing through the yarn threading hole.

6. The injection device 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.

7. The injection device according to claim 1, characterized in that The glue injection section is provided with at least one injection port, and the glue injection machine injects the resin glue liquid into the glue injection section through the injection port. The injection port is connected to a pressure sensor for detecting the pressure of the resin glue liquid in the glue injection section and feeding back to the control system of the glue injection machine.

8. The injection device according to claim 1, characterized in that The glue injection section is provided with at least one discharge port.

9. The injection device according to claim 1, characterized in that The glue injection machine includes: a frame, a driving mechanism and a glue storage container, the glue storage container is arranged on the frame, the driving mechanism is telescopically arranged in the accommodating cavity of the glue storage container, the glue storage container is connected with a feed valve and a discharge valve, and the driving mechanism can partially extend out of or into the accommodating cavity, and is used to absorb the resin glue into the accommodating cavity through the feed valve, or inject the resin glue in the accommodating cavity into the injection mold through the discharge valve.

10. The injection device according to claim 1, characterized in that The glue injection machine injects the resin glue into the injection mold in a constant pressure or constant speed mode.

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