An injection molding mold

Abstract

The application discloses an injection molding mold fixedly connected to an injection machine, comprising an upper mold assembly, a lower mold assembly, a guide assembly and a runner system; the upper mold assembly and the lower mold assembly jointly form a mold cavity after clamping, and a rubber material enters the mold cavity through the runner system; the runner system comprises a nozzle, the nozzle comprises an upper nozzle and a lower nozzle connected to each other, the upper nozzle comprises an upper cavity, the lower nozzle comprises a lower cavity, the diameter of the upper cavity gradually decreases along the direction of the rubber material flowing in, the diameter of the lower cavity gradually increases, and the minimum diameter of the upper cavity is equal to the minimum diameter of the lower cavity. The injection molding mold of the application can form an insulating protective cover of a power transmission tower through an injection process, has high dimensional precision, can avoid problems such as edge damage of the insulating protective cover, and guarantees the integrity and appearance quality of the insulating protective cover.

Description

Technical Field

[0001] This application relates to the field of silicone rubber injection molding, and in particular to an injection molding die. Background Technology

[0002] With the continuous expansion of power systems both domestically and internationally, transmission line towers, as key carriers of power transmission, face severe challenges to their safe operation. In recent years, transmission line faults caused by bird activity have become the third leading cause of power outages after lightning strikes and external damage, seriously threatening the stability of the power grid. Therefore, insulating protective covers installed at the top of the tower can effectively prevent such incidents. These insulating protective covers are typically large in size (some exceeding 1 meter) and have complex structures.

[0003] Traditional large-size insulating protective covers are usually made using compression molding. Although the cost is low, the compression molding process has low vulcanization efficiency and poor dimensional accuracy, making it difficult to meet the complex curved surface requirements of large-size insulating protective covers. In addition, the compression molding process involves manual intervention, which tests the operator's skills. Improper operation can easily cause air holes to be generated inside the insulating protective cover, so it is not suitable for mass production. Utility Model Content

[0004] In view of the shortcomings of the prior art, the main purpose of this application is to provide an injection molding mold that can form the insulation protective cover of the transmission tower through the injection process. It has high dimensional accuracy and can avoid problems such as edge damage of the insulation protective cover, thus ensuring the integrity and appearance quality of the insulation protective cover.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is: an injection molding die, fixedly connected to an injection molding machine, including an upper mold assembly, a lower mold assembly, a guide assembly, and a runner system; the upper mold assembly and the lower mold assembly together form a cavity after mold closing, and the rubber material enters the cavity through the runner system; the upper mold assembly includes an upper mold core body and an upper mold core protrusion, the upper mold core body has a cuboid structure, and has a first parting surface and a first mounting surface arranged opposite to each other along its height direction, and the outer surface of the upper mold core protrusion is a first molding surface; the lower mold assembly includes a lower mold core body, a lower mold core cavity, and an overflow groove, the lower mold core body has a cuboid structure, and has a second parting surface and a second mounting surface arranged opposite to each other along its height direction, and the outer surface of the upper mold core protrusion is a first molding surface; the lower mold assembly includes a lower mold core body, a lower mold core cavity, and an overflow groove, the lower mold core body has a cuboid structure, and has a second parting surface and a second mounting surface arranged opposite to each other along its height direction, and the outer surface of the lower mold core cavity is a first molding surface; The concave surface is the second forming surface; after the upper mold assembly and the lower mold assembly are closed, the first parting surface and the second parting surface are in close contact, and the first forming surface and the second forming surface cooperate to form a cavity; the guide assembly includes guide pillars and guide sleeves, the guide pillars are set on the first parting surface, and the guide sleeves are correspondingly set on the second parting surface. The guide pillars and guide sleeves correspond one-to-one and are inserted into the guide sleeves to guide the opening and closing of the upper mold assembly and the lower mold assembly; the flow channel system includes a nozzle, which includes an upper nozzle and a lower nozzle connected to each other. The upper nozzle includes an upper cavity with a columnar structure, and the lower nozzle includes a lower cavity with a columnar structure. Along the direction of material flow, the diameter of the upper cavity gradually decreases, and the diameter of the lower cavity gradually increases. The minimum diameter of the upper cavity is equal to the minimum diameter of the lower cavity.

[0006] The distance between the end of the guide post furthest from the first parting surface and the first parting surface is greater than the distance between the end of the upper mold core protrusion furthest from the first parting surface and the first parting surface.

[0007] The guide component also includes a positioning block and a positioning groove. The positioning groove is set on the first parting surface, and the positioning block is set on the second parting surface. The positioning groove and the positioning block are matched and installed in a one-to-one correspondence.

[0008] Both the upper mold assembly and the lower mold assembly are equipped with insulation boards on their outer periphery, which cover the sides of the upper mold core body and the lower mold core body.

[0009] The flow channel system includes a feed inlet, a connecting groove, and several flow channels. The feed inlet is a groove set on the first mounting surface, and the flow channel is a through hole set vertically on the first mounting surface. The flow channel connects the upper mold assembly and the cavity, and the connecting groove connects the feed inlet and the flow channel.

[0010] The connecting groove is provided with a threaded hole, the axis of which is perpendicular to the first mounting surface. An adjusting screw is installed in the threaded hole to adjust the effective cross-sectional area of ​​the connecting groove.

[0011] The flow channel system includes a fixed block with a channel running through its axis in the middle. The inner circumferential cross-sectional shape of the channel matches the outer circumferential cross-sectional shape of the feed nozzle.

[0012] The lower mold assembly is provided with an overflow groove, which extends from the second parting surface to the outer edge of the lower mold core body. An expansion groove is provided at the connection between the overflow groove and the cavity, and the cross-sectional area of ​​the overflow groove is smaller than that of the expansion groove.

[0013] The expansion slot is a square slot of 6×6×6mm.

[0014] The rubber compound is silicone rubber.

[0015] The beneficial effects of this application are: This application uses injection molding to form the insulation protective cover of the transmission tower, which has high dimensional accuracy and can meet the complex curved surface requirements of the insulation protective cover of the transmission tower. Moreover, no manual intervention is required during the injection molding process, making it suitable for mass production.

[0016] In this application, the diameter at the connection between the upper cavity of the feed nozzle and the lower cavity of the discharge nozzle in the injection molding mold is minimized. After curing, the fracture point of the rubber material is guided to the interface between the feed nozzle and the discharge nozzle, avoiding fracture in the connection area between the discharge nozzle and the cavity. At the same time, an expansion groove is provided at the connection between the overflow groove and the cavity. The cross-sectional area of ​​the overflow groove is smaller than that of the expansion groove. After curing, the fracture point of the rubber material is guided to the interface between the overflow groove and the expansion groove, avoiding fracture in the connection area between the overflow groove and the cavity. This avoids problems such as edge damage to the insulating protective cover and ensures the integrity and appearance quality of the insulating protective cover.

[0017] Furthermore, the injection molding mold of this application utilizes the dual positioning of guide pillars and guide sleeves, positioning blocks and positioning grooves, which can significantly improve the positioning accuracy of the injection molding mold during mold closing, avoid the flash phenomenon of the insulating protective cover, and reduce production costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0019] Figure 1 This is a schematic diagram of the upper mold assembly 200 in one embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the lower mold assembly 300 in one embodiment of this application;

[0021] Figure 3 This is a top view of the upper mold assembly 200 in one embodiment of this application;

[0022] Figure 4 This is a cross-sectional view of the upper mold assembly 200 in one embodiment of this application;

[0023] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0024] Figure 6 middle Figure 2 Enlarged view of point B in the middle. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] See Figures 1 to 2 An injection molding die is fixedly connected to an injection molding machine. The die is used to integrally injection mold an insulating protective cover for a transmission tower. It offers high dimensional accuracy, meets the complex curved surface requirements of the protective cover, and requires no manual intervention during injection molding, making it suitable for mass production. The specific structure of the injection molding machine is not shown in this application. Specifically, the injection molding die includes an upper mold assembly 200, a lower mold assembly 300, a guide assembly 400, and a runner system 500. When the upper mold assembly 200 and the lower mold assembly 300 are closed, they are guided and positioned by the guide assembly 400. After closing, the upper mold assembly 200 and the lower mold assembly 300 together form a cavity. The runner system 500 forms a material channel within the upper mold assembly 200. The material enters the cavity through the runner system 500 and, after heating and pressurization, forms the insulating protective cover. The material is a silicone rubber compound, and the silicone rubber insulating protective cover is formed through integral injection.

[0027] The upper mold assembly 200 includes an upper mold core 210 and an upper mold mounting plate 220. The upper mold core 210 includes an upper mold core body 211 and an upper mold core protrusion 212. The upper mold core body 211 has a cuboid structure and has a first parting surface 2111 and a first mounting surface 2112 arranged opposite to each other along its height direction. A first mounting groove is provided on the first mounting surface 2112 on the side of the upper mold core body 211 along its length direction. The upper mold mounting plate 220 is fixedly connected to the first mounting groove, and the surface of the upper mold mounting plate 220 away from the first mounting groove is flush with the first mounting surface 2112. There are two opposite sides of the upper mold core body 211 along its length direction, and two upper mold mounting plates 220 are provided on each side along its length direction. The upper mold mounting plates 220 correspond to and match the mounting structure on the injection molding machine, and also match the first mounting surface 2112, for matching and fixing the upper mold assembly 200 to the injection molding machine to ensure that the upper mold assembly 200 does not shift or loosen during the injection process. In other embodiments, the first mounting groove may also be located on the side of the upper mold core body 211 in the width direction, which is not limited here. The upper mold core protrusion 212 protrudes from the first parting surface 2111. The outer surface of the upper mold core protrusion 212 away from the first parting surface 2111 is the first forming surface of the upper mold core 210. The outer contour shape of the first forming surface is consistent with the inner contour shape of the insulating protective cover. The first forming surface is used to form the inner surface shape of the insulating protective cover.

[0028] The lower mold assembly 300 includes a lower mold core 310 and a lower mold mounting plate 320. The lower mold core 310 includes a lower mold core body 311 and a lower mold core cavity 312. The lower mold core body 311 has a cuboid structure and has a second parting surface 3111 and a second mounting surface 3112 arranged opposite to each other along its height direction. The second mounting surface 3112 is used to match and fix the lower mold assembly 300 with the injection molding machine. A second mounting groove is provided on the second mounting surface 3112 on the side of the lower mold core body 311 in the width direction. The lower mold mounting plate 320 is fixedly connected in the second mounting groove, and the surface of the lower mold mounting plate 320 away from the second mounting groove is flush with the second mounting surface 3112. The lower mold core body 311 has two opposite sides in the width direction, and each side in the width direction is provided with two lower mold mounting plates 320. The lower mold mounting plates 320 correspond to and match the mounting structure on the injection molding machine, and also match the second mounting surface 3112, which is used to match and fix the lower mold assembly 300 to the injection molding machine to ensure that the lower mold assembly 300 does not shift or loosen during the injection process. In other embodiments, the second mounting groove may also be located on the side in the length direction of the lower mold core body 311, which is not limited here. The lower mold core cavity 312 is formed by the second parting surface 3111 of the lower mold core body 311 being recessed in the direction of the second mounting surface 3112. The concave surface of the lower mold core cavity 3112 is the second molding surface. The inner contour shape of the second molding surface is consistent with the outer contour shape of the insulating protective cover. The second molding surface is used to form the outer surface shape of the insulating protective cover. After the upper mold assembly 200 and the lower mold assembly 300 are closed, the first parting surface 2111 and the second parting surface 3111 are in close contact, the upper mold core protrusion 212 and the lower mold core cavity 312 are matched accordingly, the first molding surface and the second molding surface cooperate to form a cavity, and then the rubber material can fill the cavity and be heated and molded into a silicone rubber insulating protective cover.

[0029] The upper mold assembly 200 and the lower mold assembly 300 are positioned and guided by a guide assembly 400 to ensure precise alignment of the upper mold assembly 200 and the lower mold assembly 300 during the mold opening and closing process of the injection molding mold, and to prevent misalignment and damage to the cavity. The guide assembly 400 includes guide posts 410, guide sleeves 420, positioning blocks 430 and positioning grooves 440. There are four guide posts 410, which are fixedly set on the upper mold assembly 200. Specifically, the four guide posts 410 are set approximately vertically at the four apex corners of the first parting surface 2111 to achieve uniform force distribution between the upper mold assembly 200 and the lower mold assembly 300. The distance between the end of the guide post 410 furthest from the first parting surface 2111 and the first parting surface 2111 is greater than the distance between the end of the upper mold core protrusion 212 furthest from the first parting surface 2111 and the first parting surface 2111. This prevents the upper mold core protrusion 212 and the lower mold core cavity 312 from colliding and causing wear during mold closing, thereby improving the lifespan of the injection molding mold and the product precision. Guide sleeves 420 are disposed on the second parting surface 3111. Specifically, the second parting surface 3111 has four guide holes that correspond to and match the guide posts 410, roughly distributed at the four apex corners of the second parting surface 3111, corresponding to the guide posts 410. Four guide sleeves 420 are also provided, each installed in one of the four guide holes. The guide posts 410 correspond one-to-one with the guide sleeves 420 and are inserted into the guide sleeves 420. Meanwhile, the guide sleeve 420 has an inner hole with a diameter slightly larger than the outer diameter of the guide post 410, allowing the guide post 410 to be inserted into the inner hole. This guides the upper mold assembly 200 to open and close smoothly relative to the lower mold assembly 300, and withstands lateral forces to prevent misalignment and damage to the cavity. In other embodiments, the number of guide posts and guide sleeves can also be set to 3, 6, or other numbers, which is not limited here.

[0030] Four positioning blocks 430 are also provided, fixedly set on the second parting surface 3111 of the lower mold assembly 300, and the positioning blocks 430 are roughly located at the four apex corners of the second parting surface 3111. The four positioning blocks 430 are respectively set adjacent to the four corresponding guide holes. Four positioning slots 440 are also provided, set on the first parting surface 2111 of the upper mold assembly 200, roughly distributed at the four apex corners of the first parting surface, corresponding to the positioning blocks 430. During the mold closing process, as the upper mold assembly 200 and the lower mold assembly 300 close, the four positioning blocks 430 and the four positioning slots 440 are matched and installed one by one, eliminating the fitting gap between the guide post 410 and the guide sleeve 420, and realizing the final precise positioning of the injection molding mold 100. In other embodiments, the number of positioning blocks and positioning slots can also be set to 3, 6 or other numbers, which is not limited here.

[0031] In this embodiment, the positioning block 430 and the positioning groove 440 adopt TBL or TBS standard positioning block components. TBL or TBS standard positioning block components are standardized precision positioning elements with high manufacturing precision, good interchangeability, and excellent wear resistance. This helps reduce movement and vibration between components of the injection molding mold, improving the overall stability of the injection molding mold. Utilizing the dual positioning of the guide post 410 and guide sleeve 420, and the positioning block 430 and positioning groove 440, the positioning accuracy of the injection molding mold during mold closing can be significantly improved, avoiding flash on the insulating protective cover and reducing production costs. In other embodiments, the positioning block and positioning groove can also use other matching positioning components, as long as precise positioning of the injection molding mold can be achieved; no limitation is imposed here.

[0032] To reduce heat loss during injection molding, both the upper mold assembly 200 and the lower mold assembly 300 are equipped with insulation plates 110 on their outer peripheries. Specifically, several insulation plates 110 cover the sides of the upper mold core body 211 and several insulation plates 110 cover the sides of the lower mold core body 311. The insulation plates 110 are fixed to the upper mold core body 211 and the lower mold core body 311 with screws, ensuring a reliable connection. By setting the insulation plates 110, the heat exchange between the injection molding mold and the surrounding environment is effectively reduced, heat loss is minimized, and the temperature stability within the cavity is maintained, ensuring that the plastic material is heated evenly within the cavity.

[0033] Combination Figure 3 and Figure 4 The runner system 500 guides the rubber material from the rubber material inlet of the injection molding machine to the cavity of the injection mold. The runner system 500 includes a feed port 510 and several runners 520. The feed port 510 is an elliptical groove provided on the first mounting surface 2112 of the upper mold assembly 200. The runners 520 are through holes vertically provided on the first mounting surface 2112, connecting the first mounting surface 2112 of the upper mold assembly 200 and the cavity. The several runners 520 are circumferentially distributed along the feed port 510. At the same time, a connecting groove 530 is provided between the feed port 510 and each runner 520 on the first mounting surface 2112. The connecting groove 530 connects the feed port 510 and each runner 520 respectively. After entering from the feed port 510, the rubber material enters the runners 520 along the several connecting grooves 530, thereby filling the cavity.

[0034] In this embodiment, two flow channels 520 and two corresponding connecting grooves 530 are symmetrically distributed on both sides of the inlet 510. Each connecting groove 530 is provided with a threaded hole, the axis of which is perpendicular to the first mounting surface 2112. The diameter of the threaded hole is slightly larger than the diameter of the connecting groove 530. A suitable adjusting screw 531 is installed in the threaded hole, specifically a hexagonal flat-end set screw. The adjusted screw 531 after installation should not protrude from the first mounting surface 2112 to ensure that the upper mold assembly 200 can achieve a reliable sealing fit with the injection molding machine. By adjusting the depth of the adjusting screw 531 screwed into the threaded hole, the height of the adjusting screw 531 protruding from the bottom of the connecting groove 530 is changed, thereby changing the effective cross-sectional area of ​​the connecting groove 530, and thus adjusting the flow rate of the adhesive in the connecting groove 530. Specifically, when the adjusting screw 531 is fully screwed into the threaded hole, the end face of the adjusting screw 531 is flush with the bottom of the connecting groove 530, and the effective cross-sectional area of ​​the connecting groove 530 is not changed. At this time, the flow rate of the adhesive in the connecting groove 530 is at its maximum. As the adjusting screw 531 is gradually screwed out of the threaded hole, the height of the adjusting screw 531 protruding from the bottom of the connecting groove 530 gradually increases, causing the effective cross-sectional area of ​​the connecting groove 530 to gradually decrease, thereby regulating the flow rate of the adhesive in the connecting groove 530. By adjusting the depth of the adjusting screw 531 screwed into the threaded hole, the flow rate of the adhesive in each flow channel 520 can be flexibly adjusted according to actual production needs. For example, when a certain part of the cavity is underfilled or overfilled, the filling state of the adhesive in the cavity can be balanced by adjusting the adjusting screw 531 on the corresponding connecting groove 530, reducing adhesive waste. In other embodiments, three or more flow channels can be provided, as long as they can meet the requirements of injection molding, and there is no limitation here.

[0035] Combination Figure 5 The flow channel system 500 also includes nozzles, which are disposed on the inner wall of the flow channel 520 and connect the first mounting surface 2112 of the upper mold assembly 200 and the mold cavity. The nozzles include an upper nozzle 540 and a lower nozzle 550 connected to each other, forming a channel for the flow of the adhesive material. The upper nozzle 540 connects to a connecting groove 530, and the lower nozzle 550 connects to the mold cavity. The adhesive material enters each connecting groove 530 from the inlet 510, then flows into the upper nozzle 540, and subsequently into the lower nozzle 550 to enter the mold cavity. In other words, within the flow channel 520, the direction from the upper nozzle 540 to the lower nozzle 550 is the adhesive material flow direction. The upper nozzle 540 includes a columnar upper cavity with a diameter that gradually decreases along the adhesive material flow direction. The lower nozzle 520 includes a columnar lower cavity with a diameter that gradually increases along the adhesive material flow direction, enabling smooth diffusion of the adhesive material before entering the mold cavity and buffering the pressure of the adhesive material entering the mold cavity. The minimum diameter of the upper cavity is equal to the minimum diameter of the lower cavity, ensuring a seamless transition of the rubber material at the junction of the feed nozzle 540 and the discharge nozzle 550, avoiding defects such as eddies caused by abrupt changes in cross-section, and improving the stability of the rubber material flow.

[0036] Furthermore, the length of the discharge nozzle 550 is set to 40mm, while the length of the loading nozzle 540 is set according to actual production needs. Since the discharge nozzle 550 is shorter, the length of the loading nozzle 540 is generally much greater than that of the discharge nozzle 550. After the injection molding process is completed, the resin material solidifies within the cavity and runner system 500. During demolding, due to the longer length of the upper cavity, its inner wall exerts a greater clamping force on the solidified resin material; while the lower cavity is shorter, its inner wall exerts a smaller clamping force on the solidified resin material. Simultaneously, the diameter at the connection between the upper and lower cavities is the smallest, forming the weakest structural area at this connection. Therefore, during ejection or manual removal of the insulating protective cover, the solidified resin material tends to fracture at this smallest diameter connection, i.e., the fracture location is guided to the interface between the loading nozzle 540 and the discharge nozzle 550, avoiding fracture in the connection area between the discharge nozzle 550 and the cavity. This prevents edge damage to the insulating protective cover and ensures its integrity and appearance quality. In other embodiments, the length of the nozzle can also be set to 20mm, 30mm or 50mm, as long as it can prevent breakage from occurring in the connection area between the nozzle and the cavity, and there is no limitation here.

[0037] The inlet of the runner 520 connecting to the cavity is defined as the gate, and the nozzle 550 is installed from the gate of the cavity. To facilitate the installation of the nozzle 550, the cross-sectional dimension of the gate is set to be larger than that of the nozzle 520. To prevent the nozzle 550 from falling into the cavity during injection, the runner system 500 also includes a fixing block 560, which is used to axially limit and support the nozzle 550. In this embodiment, the fixing block 560 is cylindrical for easy processing. The fixing block 560 has a channel extending through it axially in the middle, and the inner circumferential cross-sectional shape of the channel matches the outer circumferential cross-sectional shape of the nozzle 550, which can prevent the nozzle 550 from axially shifting during injection. One end of the nozzle 550 has an outwardly extending boss 551 on its outer periphery, and the boss 551 is located at the end of the nozzle 550 near the feed nozzle 540. The fixing block 560 is fixedly connected to the upper mold assembly 200 by fasteners. After the fixing block 560 is installed in place, one end face is flush with the surface where the gate is located, and the other end face abuts against the boss 551. Thus, the boss 551 is clamped between the fixing block 560 and the upper mold assembly 200 by axial pressing, thereby realizing the snap-fit ​​fixing of the nozzle 550. In other embodiments, the fixing block can also be set to other shapes, such as square or shapes that match the injection molding mold, as long as it can snap-fit ​​the nozzle, and there is no limitation here.

[0038] Combination Figure 6The lower mold assembly 300 is also provided with an overflow groove 330, which extends from the second parting surface 3111 in one direction to the outer edge of the lower mold core body 311, forming a venting and overflow channel connecting the cavity with the outside. The location of the overflow groove 330 is determined based on a precise analysis of the flow behavior of the adhesive. Specifically, by establishing a three-dimensional digital model of the runner system 500 and the insulating protective cover, and using simulation software to numerically simulate the filling process of the adhesive in the runner system 500 and the cavity, the dynamic flow information of the adhesive in the cavity from initial filling to final filling is obtained. Through simulation analysis, the area where the adhesive is finally filled in the cavity is identified, and the overflow groove 330 is set in the area of ​​the second parting surface 3111 corresponding to this final filling position, so as to effectively vent the gas in the cavity during the injection process and guide the excess adhesive to overflow outward, making it easy to observe whether the adhesive completely fills the cavity, thereby determining whether the injection is complete.

[0039] After the injection molding process is completed, the rubber compound solidifies within the cavity and runner system 500. During demolding, since the rubber compound also solidifies within the overflow groove 330 and is connected to the molded product body, it is necessary to break the solidified rubber compound within the overflow groove 330. To prevent breakage from occurring in the connection area between the overflow groove 330 and the cavity, an expansion groove 331 is provided at the connection point between the overflow groove 330 and the cavity. The cross-sectional area of ​​the overflow groove 330 is smaller than that of the expansion groove 331. In this embodiment, the expansion groove 331 is a 6×6×6mm square groove, and the overflow groove 330 is a semi-circular groove with an inner diameter of less than 6mm. The breakage location is guided to the interface between the overflow groove 330 and the expansion groove 331, avoiding breakage in the connection area between the overflow groove 330 and the cavity. This avoids problems such as edge damage to the insulating protective cover, ensuring the integrity and appearance quality of the insulating protective cover. In other embodiments, the expansion groove can also be set as a circular groove, an irregularly shaped groove, etc., as long as it can prevent the breakage from occurring in the connection area between the overflow groove and the cavity, and there is no limitation here.

[0040] During injection molding mold assembly, the feeding nozzle 540, the unloading nozzle 550, and the fixing block 560 are first installed into the upper mold assembly 200. The fixing block 560 is then fixedly connected to the upper mold assembly 200 using fasteners, thereby limiting the unloading nozzle 550 and preventing it from falling into the cavity when the upper mold assembly 200 and lower mold assembly 300 close. Next, the adjusting screw 531 on the connecting groove 530 is adjusted to regulate the flow rate of the resin in each runner 520 according to actual production needs. Afterwards, the upper mold assembly 200 and lower mold assembly 300 are placed into the injection molding machine, and the upper mold mounting plate 220 and lower mold mounting plate 320 are then installed in conjunction with the injection molding machine. Finally, the guide post 410 is inserted into the guide sleeve 420, and the positioning block 430 and the positioning groove 440 are pressed together. The first parting surface 2111 and the second parting surface 3111 are in close contact. The first molding surface and the second molding surface cooperate to form a complete cavity, so as to achieve precise mold closing between the upper mold assembly 200 and the lower mold assembly 300.

[0041] During the injection process, the rubber material is injected from the injection molding machine into the flow channel system 500 of the injection molding mold. It then enters the cavity between the upper mold assembly 200 and the lower mold assembly 300 through the inlet 510, the connecting groove 530, the upper cavity of the loading nozzle 540, and the lower cavity of the unloading nozzle 550. When the rubber material completely fills the cavity, the excess rubber material flows out of the injection molding mold through the overflow groove 330 under continuous pressure, at which point the injection stops.

[0042] After curing, the injection molding mold is opened for demolding to obtain the insulating protective cover. Specifically, when the molded product separates from the upper mold assembly 200, the cured adhesive breaks at the interface between the feed nozzle 540 and the discharge nozzle 550, without affecting the insulating protective cover itself. The broken area can then be smoothed out. When the molded product separates from the lower mold assembly 300, the cured adhesive located in the overflow groove 330 is connected to the molded product body. When it is broken, the cured adhesive breaks at the interface between the overflow groove 330 and the expansion groove 331, without affecting the insulating protective cover itself. The broken area can then be smoothed out.

[0043] The beneficial effects of this application are: This application uses injection molding to form the insulation protective cover of the transmission tower, which has high dimensional accuracy and can meet the complex curved surface requirements of the insulation protective cover of the transmission tower. Moreover, no manual intervention is required during the injection molding process, making it suitable for mass production.

[0044] In this application, the diameter at the connection between the upper cavity of the feed nozzle and the lower cavity of the discharge nozzle in the injection molding mold is minimized. After curing, the fracture point of the rubber material is guided to the interface between the feed nozzle and the discharge nozzle, avoiding fracture in the connection area between the discharge nozzle and the cavity. At the same time, an expansion groove is provided at the connection between the overflow groove and the cavity. The cross-sectional area of ​​the overflow groove is smaller than that of the expansion groove. After curing, the fracture point of the rubber material is guided to the interface between the overflow groove and the expansion groove, avoiding fracture in the connection area between the overflow groove and the cavity. This avoids problems such as edge damage to the insulating protective cover and ensures the integrity and appearance quality of the insulating protective cover.

[0045] Furthermore, the injection molding mold of this application utilizes the dual positioning of guide pillars and guide sleeves, positioning blocks and positioning grooves, which can significantly improve the positioning accuracy of the injection molding mold during mold closing, avoid the flash phenomenon of the insulating protective cover, and reduce production costs.

[0046] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An injection molding die, fixedly connected to an injection molding machine, characterized in that, The injection molding die includes an upper mold assembly, a lower mold assembly, a guide assembly, and a runner system. The upper mold assembly and the lower mold assembly together form a cavity after the mold is closed, and the rubber material enters the cavity through the runner system. The upper mold assembly includes an upper mold core body and an upper mold core protrusion. The upper mold core body has a cuboid structure and has a first parting surface and a first mounting surface arranged opposite to each other along its height direction. The outer surface of the upper mold core protrusion is a first forming surface. The lower mold assembly includes a lower mold core body and a lower mold core cavity. The lower mold core body has a cuboid structure and has a second parting surface and a second mounting surface arranged opposite to each other along its height direction. The concave surface of the lower mold core cavity is a second forming surface. After the upper mold assembly and the lower mold assembly are closed, the first parting surface and the second parting surface are in close contact, and the first forming surface and the second forming surface cooperate to form the cavity. The guiding component includes a guide post and a guide sleeve. The guide post is disposed on the first parting surface, and the guide sleeve is disposed on the second parting surface. The guide post and the guide sleeve correspond one-to-one and are inserted into the guide sleeve to guide the opening and closing of the upper mold component and the lower mold component. The flow channel system includes a nozzle, which includes an upper nozzle and a lower nozzle connected to each other. The upper nozzle includes an upper cavity with a columnar structure, and the lower nozzle includes a lower cavity with a columnar structure. Along the direction of rubber material flow, the diameter of the upper cavity gradually decreases, and the diameter of the lower cavity gradually increases. The minimum diameter of the upper cavity is equal to the minimum diameter of the lower cavity.

2. The injection molding die as described in claim 1, characterized in that, The distance between the end of the guide post furthest from the first parting surface and the first parting surface is greater than the distance between the end of the upper mold core protrusion furthest from the first parting surface and the first parting surface.

3. The injection molding die as described in claim 1, characterized in that, The guide component further includes a positioning block and a positioning groove. The positioning groove is disposed on the first parting surface, and the positioning block is disposed on the second parting surface. The positioning groove and the positioning block are matched and installed in a one-to-one correspondence.

4. The injection molding die as described in claim 1, characterized in that, Both the upper mold assembly and the lower mold assembly are provided with insulation plates on their outer peripheries, and the insulation plates cover the sides of the upper mold core body and the lower mold core body.

5. The injection molding die as described in claim 1, characterized in that, The flow channel system includes a feed inlet, a connecting groove, and several flow channels. The feed inlet is a groove provided on the first mounting surface. The flow channels are through holes vertically provided on the first mounting surface. The flow channels connect the upper mold assembly and the cavity. The connecting groove connects the feed inlet and the flow channels.

6. The injection molding die as described in claim 5, characterized in that, The connecting groove is provided with a threaded hole, the axis of which is perpendicular to the first mounting surface. An adjusting screw is installed in the threaded hole to adjust the effective cross-sectional area of ​​the connecting groove.

7. The injection molding die as described in claim 1, characterized in that, The flow channel system also includes a fixing block, the fixing block having a channel running through its axis in the middle, the inner circumferential cross-sectional shape of the channel matching the outer circumferential cross-sectional shape of the feed nozzle.

8. The injection molding die as described in claim 1, characterized in that, The lower mold assembly is provided with an overflow groove, which extends from the second parting surface to the outer edge of the lower mold core body. An expansion groove is provided at the connection between the overflow groove and the cavity, and the cross-sectional area of ​​the overflow groove is smaller than the cross-sectional area of ​​the expansion groove.

9. The injection molding die as described in claim 8, characterized in that, The expansion slot is a square slot of 6×6×6mm.

10. The injection molding die as described in claim 1, characterized in that, The adhesive material is silicone rubber.

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