Injection molding apparatus for hybrid insulators

Abstract

The application relates to a kind of injection molding equipment of hybrid insulator, including injection unit, mould unit, electric control unit, temperature control unit, hydraulic control unit, rack and safety protection unit, injection unit includes feeding mechanism, plasticizing mechanism and injection mechanism, feeding mechanism is used to receive high-temperature vulcanized solid silicone rubber and output after high-temperature vulcanized solid silicone rubber is compacted and exhausted, plasticizing mechanism is used to receive high-temperature vulcanized solid silicone rubber sent by feeding mechanism and output after high-temperature vulcanized solid silicone rubber is once plasticized, injection mechanism is used to receive high-temperature vulcanized solid silicone rubber sent by plasticizing mechanism and output after high-temperature vulcanized solid silicone rubber is twice plasticized.The application is more compact by setting two-stage plasticizing, and high-temperature vulcanized solid silicone rubber is injected into mould in better flowability, and the performance of the covering layer of the finally formed hybrid insulator is more excellent, and the product quality of hybrid insulator is improved.

Description

Technical Field

[0001] This invention relates to the field of hybrid insulator production technology, and in particular to an injection molding device for hybrid insulators. Background Technology

[0002] Ultra-high voltage (UHV) transmission lines have outstanding advantages such as large transmission capacity, long distance, low loss, and small land area. They have become a major issue in solving the problems of grid connection of high proportion of renewable energy and large-scale inter-provincial and inter-regional power allocation in my country.

[0003] Insulators, as key components of ultra-high voltage (UHV) transmission lines, have an annual output value exceeding tens of billions of yuan. The first-generation ceramic insulators used in traditional high-voltage lines, a technological solution first proposed by Japan, have a service life of approximately 50 years. However, due to numerous drawbacks such as fragility, flashover susceptibility, surface adhesion, and high maintenance costs, they are no longer sufficient to meet the construction requirements of UHV lines. The second-generation insulator, a composite insulator first developed by Europe and the United States, suffers from the relatively soft silicone rubber material, high price, and a service life of only about 10 years, also failing to meet the needs of large-scale construction. The "new generation (third generation) hybrid insulator" technology, a third technological solution distinct from those of Japan and Europe, was first proposed by our team. Its core lies in developing specialized molds and molding equipment for overmolding, and innovating injection molding processes to achieve hybrid overmolding of ceramic and glass insulators. The new generation of hybrid insulators has an expected lifespan of approximately 70 years, with 40-50 years of maintenance-free operation. The profit per unit is 400-500 yuan higher than traditional insulators, resulting in significant economic value.

[0004] Currently, most insulator manufacturers in the international power industry produce traditional porcelain and glass insulators, which suffer from uncontrollable structure, large dimensional deviations, and high quality variability. This is especially true for large insulators; even within the same model and batch, radial and axial dimensional deviations can reach 10mm or more, and shape errors are difficult to control. Furthermore, the fragility of porcelain and glass materials themselves poses significant challenges to the overmolding process of next-generation hybrid insulators. Moreover, while the high-voltage dielectric properties of the high-temperature vulcanized silicone rubber currently used in the industry are undeniable, its drawbacks include its solid state during overmolding, high Mooney viscosity, reliance on plastic deformation for overmolding, high process complexity, demanding vulcanization conditions, and extremely difficult molding. Currently, there is no specialized molding equipment on the market for the production of ultra-high voltage hybrid power insulators. Using existing traditional rubber machines for industrial-scale pilot production would result in very low molding efficiency and poor process control.

[0005] Chinese utility model patent CN218660276U discloses an injection mold for uniformly coated hybrid insulators, comprising: a frame, an upper mold, a lower mold, side molds, and a runner. The lower mold is mounted on the frame and has a mold core. The side molds are movably mounted on the lower molds on both sides of the mold core. The upper mold is mounted on the frame above the side molds. When the mold is closed, the lower mold, side molds, and upper mold form a molding cavity that conforms to the contour of the ceramic component. The runner is used to transport silicone rubber into the molding cavity, and the outlet ends of the runner are located on both sides of the upper and bottom of the molding cavity. In this patent, liquid rubber is injected into the molding cavity for coating, resulting in a poor coating layer performance for the final hybrid insulator. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is how to provide a mild insulator with excellent coating performance.

[0007] To solve the above-mentioned technical problems, the present invention provides an injection molding device for hybrid insulators, comprising an injection unit for receiving coating material and injecting it after plasticizing the coating material, and a mold unit for accommodating the preform and receiving the coating material from the injection unit and solidifying the coating material on the outside of the preform, wherein the injection unit includes:

[0008] The feeding mechanism is used to receive high-temperature vulcanized solid silicone rubber and output it after compacting and venting the high-temperature vulcanized solid silicone rubber. The feeding mechanism includes a feeding cylinder for containing the high-temperature vulcanized solid silicone rubber and a pusher plunger for compacting and conveying the high-temperature vulcanized solid silicone rubber.

[0009] A plasticizing mechanism is used to receive the high-temperature vulcanized solid silicone rubber fed by the feeding mechanism and to output the high-temperature vulcanized solid silicone rubber after one plasticizing process. The plasticizing mechanism includes a plasticizing cylinder for containing the high-temperature vulcanized solid silicone rubber and a plasticizing screw for shearing and conveying the high-temperature vulcanized solid silicone rubber.

[0010] An injection mechanism is provided for receiving high-temperature vulcanized solid silicone rubber from the plasticizing mechanism and performing secondary plasticizing on the high-temperature vulcanized solid silicone rubber before outputting it. The injection mechanism includes an injection cylinder for containing the high-temperature vulcanized solid silicone rubber and an injection screw for shearing and conveying the high-temperature vulcanized solid silicone rubber.

[0011] The high-temperature vulcanized solid silicone rubber undergoes its first plasticization in the plasticizing mechanism, followed by degassing, compaction, temperature control, and precise feeding to the injection mechanism. Before injection molding, the injection mechanism performs a second plasticization on the high-temperature vulcanized solid silicone rubber. The screw further compacts the high-temperature vulcanized solid silicone rubber and precisely controls the temperature to ensure that the injection material fully meets the molding requirements for injection volume, injection temperature, and pressure.

[0012] The mold unit receives the high-temperature vulcanized solid silicone rubber from the injection mechanism and heats and cures the high-temperature vulcanized solid silicone rubber.

[0013] In one embodiment of the present invention, the plasticizing cylinder is arranged vertically, and the feeding cylinder and the injection cylinder are both arranged horizontally.

[0014] In one embodiment of the present invention, the injection cylinder is disposed above the feed cylinder.

[0015] In one embodiment of the present invention, the outlet of the feed cylinder and the outlet of the injection cylinder face the same direction.

[0016] In one embodiment of the present invention, the mold unit includes:

[0017] A mold, the mold being used to hold a preform and cover material;

[0018] A lower mold base, which is installed at the bottom of the mold and is used to support the mold;

[0019] A heating plate, which is mounted on the lower mold base and used to heat the lower mold base;

[0020] An upper mold base is installed above the mold, and the upper mold base is provided with a mold base injection port that communicates with the outlet of the injection cylinder;

[0021] A runner plate is installed at the bottom of the upper mold base. The runner plate can open and close with the mold along the vertical direction. The runner plate is provided with a runner, which can communicate with the injection port of the mold base and the inner cavity of the mold.

[0022] An upper and lower opening and closing mold mechanism is used to drive the flow channel plate and the mold to open and close in the upper and lower direction.

[0023] In one embodiment of the present invention, the upper and lower opening and closing mold mechanism is installed at the bottom of the lower mold base, and the upper and lower opening and closing mold mechanism drives the lower mold base to move up and down in the vertical direction.

[0024] In one embodiment of the present invention, the flow channel has multiple flow channel outlets, and the multiple flow channel outlets correspond to different positions in the inner cavity of the mold.

[0025] In one embodiment of the present invention, the outlet of the flow channel is connected to a flow channel pipe, which extends into the inner cavity of the mold.

[0026] In one embodiment of the invention, the flow channel is retractable.

[0027] In one embodiment of the present invention, the mold unit further includes a lateral core-pulling mechanism for driving the side cores within the mold to move laterally.

[0028] The technical solution of the present invention has the following advantages compared with the prior art:

[0029] 1) The injection molding equipment for the hybrid insulator described in this invention, by setting two-stage plasticization, makes the high-temperature vulcanized solid silicone rubber more dense. At this time, the high-temperature vulcanized solid silicone rubber contains almost no impurities and air bubbles, which can achieve precise feeding. At the same time, the pressure of the high-temperature vulcanized solid silicone rubber reaches 120 to 150 bar, and the coating layer of the final hybrid insulator has better performance, thus improving the product quality of the hybrid insulator.

[0030] 2) The injection molding equipment for hybrid insulators described in this invention achieves two-stage plasticizing without increasing the length of the molding equipment by setting the plasticizing cylinder vertically and the feeding cylinder and injection cylinder horizontally. Attached Figure Description

[0031] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0032] Figure 1 A schematic diagram from one angle of the injection molding equipment for the hybrid insulator provided by the present invention;

[0033] Figure 2 This is a schematic diagram showing the connection between the feeding mechanism, plasticizing mechanism, and injection mechanism disclosed in this invention;

[0034] Figure 3 This is a schematic diagram showing the fit between the runner plate disclosed in this invention and the lower mold of the transfer mold at the injection station;

[0035] Figure 4 This is a perspective view of the flow channel plate disclosed in this invention;

[0036] Figure 5 This is a front view of the flow channel plate disclosed in this invention.

[0037] Explanation of reference numerals in the instruction manual:

[0038] 1. Injection unit; 11. Feeding mechanism; 111. Feeding cylinder; 112. Push plunger; 113. Side feeding port; 12. Plasticizing mechanism; 121. Plasticizing cylinder; 122. Plasticizing screw; 13. Injection mechanism; 131. Injection cylinder; 132. Injection screw;

[0039] 2. Mold unit; 21. Lower mold base; 22. Heating plate; 23. Upper mold base; 24. Runner plate; 241. Runner; 242. Runner tube; 25. Upper and lower mold opening and closing mechanism; 26. Side core pulling mechanism; 27. Station switching mechanism; 281. Lower mold; 282. Upper mold; 283. Upper mold injection port;

[0040] 31. Electrical control unit; 32. Hydraulic control unit; 33. Temperature control unit. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0042] Example 1

[0043] See Figures 1 to 5 As shown, an injection molding apparatus for a hybrid insulator includes an injection unit 1 for receiving and plasticizing a coating material before injection, and a mold unit 2 for accommodating a preform, receiving the coating material from the injection unit 1, and solidifying the coating material on the outside of the preform. The injection unit includes:

[0044] Feeding mechanism 11 is used to receive high-temperature vulcanized solid silicone rubber and output it after compacting and venting the high-temperature vulcanized solid silicone rubber. The feeding mechanism 11 includes a feeding cylinder 111 for containing high-temperature vulcanized solid silicone rubber and a pusher plunger 112 for compacting and conveying high-temperature vulcanized solid silicone rubber.

[0045] Plasticizing mechanism 12 is used to receive the high-temperature vulcanized solid silicone rubber sent by the feeding mechanism 11 and output the high-temperature vulcanized solid silicone rubber after one plasticizing. The plasticizing mechanism 12 includes a plasticizing cylinder 121 for containing the high-temperature vulcanized solid silicone rubber and a plasticizing screw 122 for shearing and conveying the high-temperature vulcanized solid silicone rubber.

[0046] The injection mechanism 13 is used to receive the high-temperature vulcanized solid silicone rubber sent by the plasticizing mechanism 12 and to output the high-temperature vulcanized solid silicone rubber after secondary plasticizing. The injection mechanism 13 includes an injection cylinder 131 for containing the high-temperature vulcanized solid silicone rubber and an injection screw 132 for shearing and conveying the high-temperature vulcanized solid silicone rubber.

[0047] The high-temperature vulcanized solid silicone rubber undergoes its first plasticization in the plasticizing mechanism 12, followed by degassing, compaction, temperature control, and precise feeding to the injection mechanism 13. Before injection molding, the injection mechanism 13 performs a second plasticization on the high-temperature vulcanized solid silicone rubber. The screw further compacts the high-temperature vulcanized solid silicone rubber and precisely controls the temperature to ensure that the injection material fully meets the molding requirements of injection volume, injection temperature, and pressure.

[0048] The aforementioned mold unit is used to accommodate the preform and receive the high-temperature vulcanized solid silicone rubber sent by the injection mechanism 13, and to heat and cure the high-temperature vulcanized solid silicone rubber.

[0049] The feed cylinder has a side feeding port 113 on its outer side, through which solid materials can be added; the pusher plunger can compact the solid materials and remove the entrained air under the drive of the motor, and push them into the plasticizing mechanism; the feed cylinder is connected to the side wall of the plasticizing cylinder and can swing up and down, which makes it convenient to adjust the height of the feed cylinder and the position of the feed port, so as to facilitate the operation of the workers.

[0050] The plasticizing cylinder is equipped with a high-temperature oil circuit heating unit on its exterior. The temperature of the high-temperature oil circuit heating system is adjustable and can precisely control the temperature of the plasticizing cylinder, with a temperature range of 20-100℃ and a temperature deviation of 0.5℃. The front end of the plasticizing cylinder is designed with an upward-facing connecting port, which connects to the injection mechanism. Inside the plasticizing cylinder is a plasticizing screw, which works in conjunction with the plasticizing motor on the rear side of the plasticizing cylinder. Driven by the motor, it can rotate and move to achieve shearing, plasticizing, compaction, and removal of air from solid materials, and feed the material to the injection mechanism through the front connecting port.

[0051] The aforementioned injection barrel is equipped with heating coils, high-temperature oil circuits, and other heating units in its outer sections. These heating units allow for precise temperature control of the entire barrel segment, with a temperature range of 20-200℃ and a control accuracy within 0.5℃. An injection screw is installed inside the injection barrel, working in conjunction with an injection motor at the rear. Driven by the motor, the screw rotates and moves, achieving secondary plasticization, compaction, degassing, and injection of the solid material. A right-angle downward-facing injection nozzle is located at the front of the injection barrel. An oil temperature control unit is located on the outer edge of the nozzle, connected to and independently controllable by the oil temperature control system on the outside of the injection barrel. The secondary plasticized solid material is injected through the injection nozzle into the mold unit. The final high-temperature vulcanized solid silicone rubber injected into the mold unit by the injection mechanism has a viscosity of approximately 12.

[0052] The molding method of the above-mentioned hybrid insulator injection molding equipment is described below, including the following steps:

[0053] The first step is to put high-temperature vulcanized solid silicone rubber into the feeding cylinder 111, and then to push the high-temperature vulcanized solid silicone rubber in the feeding cylinder 111 to expel the entrained air and then to convey it to the plasticizing cylinder 121.

[0054] The second step involves shearing, plasticizing, compacting, and removing air contamination from the high-temperature vulcanized solid silicone rubber in the plasticizing cylinder 121 through the plasticizing screw 122 and then conveying it to the injection cylinder 131.

[0055] The third step involves injecting the high-temperature vulcanized solid silicone rubber in the injection cylinder 131 into the mold unit through the injection screw 132 after secondary shearing, plasticizing, compaction, and degassing.

[0056] The fourth step involves using the aforementioned mold unit to coat the preform with high-temperature vulcanized solid silicone rubber at the designated position.

[0057] In this preferred embodiment, the plasticizing cylinder 121 is vertically positioned, while the feeding cylinder 111 and the injection cylinder 131 are both horizontally positioned. The plasticizing cylinder is vertically positioned, the injection cylinder is horizontally positioned, and the feeding cylinder is inclined upwards at a 30-degree angle. This arrangement reduces the length of the plasticizing equipment, making its structure more compact.

[0058] In this preferred embodiment, the injection cylinder 131 is positioned above the feed cylinder 111. The lower position of the feed cylinder facilitates the addition of the coating material, while the higher position of the injection cylinder, including its injection nozzle, allows for the injection of the coating material into the mold unit.

[0059] In this preferred embodiment, the outlets of the feed cylinder 111 and the injection cylinder 131 face the same direction. The outlet of the feed cylinder faces forward, and the outlet of the injection cylinder faces forward.

[0060] In a preferred embodiment of this invention, the mold unit includes:

[0061] A mold (not shown in the figure) is used to hold the preform and cover the material.

[0062] The lower mold base 21 is installed at the bottom of the mold and is used to support the mold.

[0063] Heating plate 22, which is installed on the lower mold base 21 and used to heat the lower mold base 21;

[0064] Upper mold base 23 is installed above the mold and has an injection port that communicates with the outlet of the injection cylinder 131.

[0065] Runner plate 24 is installed at the bottom of the upper mold base 23. The runner plate 24 can open and close with the mold along the vertical direction. The runner plate 24 is provided with runner 241, which can communicate with the injection port of the mold base and the inner cavity of the mold.

[0066] The upper and lower opening and closing mold mechanism 25 is used to drive the runner plate and the mold to open and close in the upper and lower direction.

[0067] The aforementioned mold unit is designed at the front end of the plasticizing equipment and works in conjunction with the injection unit. The upper mold base has a runner system, with the upper end of the runner contacting and engaging with the injection nozzle, allowing the coating material to enter the mold unit. A runner plate is installed on the upper mold base, and its runner system seamlessly connects with that of the upper mold base. The runner system within the runner plate is a cold runner system with an adjustable temperature range of 20-60℃, ensuring rapid material flow during molding. When the plasticizing equipment is idle or stopped, the material in the runner remains uncured. A heating plate is installed on the lower mold base and has a built-in electric heating device. During production, it preheats the mold mounted on it and maintains a relatively high and stable mold temperature, which is beneficial for product molding.

[0068] In this preferred embodiment, the upper and lower mold opening and closing mechanism 25 is installed at the bottom of the lower mold base 21, and the upper and lower mold opening and closing mechanism 25 drives the lower mold base 21 to move up and down in the vertical direction. Since the upper mold base is connected to the injection unit, the injection unit and the upper mold base are fixedly set, and the mold opening and closing in the vertical direction is realized by the lifting and lowering of the lower mold base. This can shorten the flow stroke of the coating material. The upper and lower mold opening and closing mechanism is a hydraulic cylinder.

[0069] In this preferred embodiment, the flow channel 241 has multiple flow channel outlets, each corresponding to a different position within the mold cavity. By providing multiple flow channel outlets, the pressure on the preform during injection is more even, and the high-temperature vulcanized solid silicone rubber is more easily injected into the designated positions.

[0070] In this preferred embodiment, the outlet of the flow channel 241 is connected to a flow channel tube 242, which extends into the inner cavity of the mold. Since the flowability of high-temperature vulcanized solid silicone rubber is not very good, the flow channel tube can extend into the inner cavity of the lower mold, making it easier to inject the high-temperature vulcanized solid silicone rubber into the lower mold near the bottom.

[0071] In this preferred embodiment, the runner tube 242 is telescopic. During injection, the runner tube can extend and retract; initially, it is longer, and as injection progresses, it gradually shortens. In other words, during injection, the outlet of the runner tube gradually moves away from the bottom of the lower mold.

[0072] In a preferred embodiment of this invention, the mold unit further includes a lateral core-pulling mechanism 26, which drives the side core within the mold to move laterally. Since the hybrid insulator is umbrella-shaped with different outer diameters at different axial positions, the lateral core-pulling mechanism can shape irregular shapes and remove the final product. Specifically, the lateral core-pulling mechanism includes a pull rod and a hydraulic cylinder to achieve lateral core pulling. When the mold is a transfer mold, the lateral suction mechanism is detachably connected to the side core of the mold; when the mold is a fixed mold, the lateral suction mechanism is fixedly connected to the side core of the mold.

[0073] In a preferred embodiment of this invention, the mold unit further includes:

[0074] Injection station;

[0075] The loading and unloading station is located to the side of the injection station.

[0076] The station switching mechanism 27 is used to drive the lower mold base 21 to move between the injection station and the loading / unloading station.

[0077] In operation, the lower mold base first moves to the loading / unloading station. The robot arm places the parison into the mold at the loading / unloading station, or places the mold containing the parison onto the lower mold base at the loading / unloading station. Then, the lower mold base, carrying the mold, moves to the injection station. The lower mold base then moves upward to close the runner plate with the mold at the injection station. The injection mechanism injects high-temperature vulcanized solid silicone rubber around the parison in the mold. After the coating material in the mold has solidified, the lower mold base moves downward to open the runner plate from the mold at the injection station. The lower mold base then returns to the loading / unloading station with the mold. The robot arm removes the parison from the mold at the loading / unloading station, or removes the mold containing the parison from the lower mold base at the loading / unloading station. The aforementioned station switching mechanism includes a stepper motor.

[0078] In a preferred embodiment of this invention, the mold unit includes:

[0079] Two loading and unloading stations are respectively located on both sides of the injection station.

[0080] Two lower mold bases 21 are provided, one of which is used to support one mold and move the mold between the injection station and one loading / unloading station, and the other is used to support another mold and move the mold between the injection station and another loading / unloading station.

[0081] The two heating plates 22 are used to heat the two lower mold bases 21 respectively;

[0082] The aforementioned workstation switching mechanism 27 drives the two aforementioned lower mold bases 21 to move synchronously.

[0083] When using it, the following steps are included:

[0084] S1. The first lower mold base is transferred to the first loading and unloading station. The robot arm places the blank into the mold of the first loading and unloading station or places the mold containing the blank onto the first lower mold base of the first loading and unloading station.

[0085] S2. The first lower mold base, carrying the mold, arrives at the injection station. The first lower mold base moves upward so that the runner plate closes with the mold at the injection station. The injection mechanism injects high-temperature vulcanized solid silicone rubber around the parison in the mold. After the coating material in the mold solidifies, the second lower mold base moves to the second loading and unloading station. The robot puts the parison into the mold at the second loading and unloading station or puts the mold containing the parison onto the second lower mold base at the second loading and unloading station.

[0086] S3. The second lower mold base, carrying the mold, arrives at the injection station. The second lower mold base moves upward so that the runner plate closes with the mold at the injection station. The injection mechanism injects high-temperature vulcanized solid silicone rubber around the parison in the mold. After the coating material in the mold solidifies, the first lower mold base moves to the first loading and unloading station. The robot places the parison into the mold at the first loading and unloading station or places the mold containing the parison onto the first lower mold base at the first loading and unloading station, returning to step S2.

[0087] In this preferred embodiment, the mold is a transfer mold, which includes an openable and closable upper mold 282 and a lower mold 281. Multiple transfer molds are used interchangeably with the same lower mold base. The delivered transfer mold is placed on the lower mold base. The upper mold 282 and lower mold 281 of the transfer mold on the lower mold base do not need to be opened. The flow channel of the runner plate is connected to the injection port 283 of the upper mold of the transfer mold.

[0088] In this preferred embodiment, the upper and lower mold opening and closing mechanism 25 is installed below the injection station, and the mechanism drives the lower mold base 21 of the injection station to rise and fall. Since the upper mold base is connected to the injection unit, fixing the injection unit to the upper mold base shortens the flow path of the coating material. The mold opening and closing in the vertical direction is achieved by raising and lowering the lower mold base. Specifically, the upper and lower mold opening and closing mechanism is a hydraulic cylinder.

[0089] In a preferred embodiment of this invention, each of the aforementioned loading and unloading stations is further provided with a lateral core-pulling mechanism 26 on its side. This lateral core-pulling mechanism 26 drives the side core within the mold at the loading and unloading station to move laterally. Since the hybrid insulator is umbrella-shaped, its outer diameter varies at different axial positions. The lateral core-pulling mechanism can shape irregular shapes and remove the final product. Specifically, the lateral core-pulling mechanism includes a pull rod and a hydraulic cylinder, enabling lateral core pulling. When the mold is a transfer mold, the lateral suction mechanism is detachably connected to the side core of the mold; when the mold is a fixed mold, the lateral suction mechanism is fixedly connected to the side core of the mold.

[0090] In addition, the aforementioned injection molding equipment for hybrid insulators also includes an electrical control unit 31, a hydraulic control unit 32, a temperature control unit 33, a frame, and a safety protection unit. The electrical control unit comprises two parts: one part is located at the rear of the molding equipment, housing all the electrical control modules and systems of the molding machine, primarily for electrical control during operation and maintenance. The other part is located in the center of the front safety door, including a visual operation panel and a retractable operating handle, enabling process operation during the molding process. The hydraulic control unit is located inside the rear of the molding equipment, below the feeding mechanism, primarily controlling the hydraulic system for feeding, plasticizing, injection, mold base up-and-down movement, pressure holding, and left-and-right mold opening during operation and maintenance. The temperature control unit is located inside the rear of the molding equipment, parallel to the hydraulic system, primarily controlling the plasticizing temperature, injection temperature, runner plate, mold base, and other temperature units. The frame is the main load-bearing structure of the molding equipment. Safety protection unit: Installed on the sides around the molding machine, the main body is divided into front and rear sides, and a safety door is opened at the feeding mechanism at the rear for easy operation and feeding; the front of the equipment is designed with an operation panel and a telescopic operation handle in the middle, which can realize the process operation of the molding process.

[0091] Example 2

[0092] The rest is the same as in Embodiment 1, except that the mold described above is a fixed mold, which includes a lower mold, and each lower mold base corresponds to one fixed mold. The delivered blank is loaded into the fixed mold.

[0093] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An injection molding machine for hybrid insulators, comprising an injection unit for receiving and plasticizing a coating material and then injecting it; a mold unit for accommodating a preform and receiving the coating material from the injection unit and solidifying the coating material on the outside of the preform; an electrical control unit for controlling various electrical components of the injection molding machine; a temperature control unit for controlling various heating devices of the injection molding machine; a hydraulic control unit for controlling various hydraulic devices of the injection molding machine; a frame serving as the main load-bearing structure of the injection molding machine; and a safety protection unit for providing safety protection for the injection molding machine, characterized in that... The injection unit includes: The feeding mechanism is used to receive high-temperature vulcanized solid silicone rubber and output it after compacting and venting the high-temperature vulcanized solid silicone rubber. The feeding mechanism includes a feeding cylinder for containing the high-temperature vulcanized solid silicone rubber and a pusher plunger for compacting and conveying the high-temperature vulcanized solid silicone rubber. A plasticizing mechanism is used to receive the high-temperature vulcanized solid silicone rubber fed by the feeding mechanism and to output the high-temperature vulcanized solid silicone rubber after one plasticizing process. The plasticizing mechanism includes a plasticizing cylinder for containing the high-temperature vulcanized solid silicone rubber and a plasticizing screw for shearing and conveying the high-temperature vulcanized solid silicone rubber. An injection mechanism is provided for receiving high-temperature vulcanized solid silicone rubber from the plasticizing mechanism and performing secondary plasticizing on the high-temperature vulcanized solid silicone rubber before outputting it. The injection mechanism includes an injection cylinder for containing the high-temperature vulcanized solid silicone rubber and an injection screw for shearing and conveying the high-temperature vulcanized solid silicone rubber. The high-temperature vulcanized solid silicone rubber undergoes its first plasticization in the plasticizing mechanism, followed by degassing, compaction, temperature control, and precise feeding to the injection mechanism. Before injection molding, the injection mechanism performs a second plasticization on the high-temperature vulcanized solid silicone rubber. The injection screw further compacts the high-temperature vulcanized solid silicone rubber and precisely controls the temperature to ensure that the injection material fully meets the molding requirements for injection volume, injection temperature, and pressure. The mold unit receives the high-temperature vulcanized solid silicone rubber from the injection mechanism and heats and cures the high-temperature vulcanized solid silicone rubber. The mold unit includes: A mold, the mold being used to hold a preform and cover material; A lower mold base, which is installed at the bottom of the mold and is used to support the mold; A heating plate, which is mounted on the lower mold base and used to heat the lower mold base; An upper mold base is installed above the mold, and the upper mold base is provided with a mold base injection port that communicates with the outlet of the injection cylinder; A runner plate is installed at the bottom of the upper mold base. The runner plate can open and close with the mold along the vertical direction. The runner plate is provided with a runner, which can communicate with the injection port of the mold base and the inner cavity of the mold. An upper and lower mold opening and closing mechanism is used to drive the flow channel plate and the mold to open and close in the upper and lower direction; The flow channel has multiple flow channel outlets, and the multiple flow channel outlets correspond to different positions in the mold cavity; The outlet of the flow channel is connected to a flow channel pipe, which extends into the inner cavity of the mold. The runner is telescopic, and during injection molding, the outlet of the runner gradually moves away from the bottom of the lower mold.

2. The injection molding equipment for hybrid insulators according to claim 1, characterized in that, The plasticizing cylinder is set vertically, while the feeding cylinder and the injection cylinder are both set horizontally.

3. The injection molding equipment for hybrid insulators according to claim 2, characterized in that, The injection cylinder is positioned above the feed cylinder.

4. The injection molding equipment for hybrid insulators according to claim 2, characterized in that, The outlet of the feed cylinder and the outlet of the injection cylinder face the same direction.

5. The injection molding equipment for hybrid insulators according to claim 1, characterized in that, The upper and lower opening and closing mold mechanism is installed at the bottom of the lower mold base, and the upper and lower opening and closing mold mechanism drives the lower mold base to move up and down in the vertical direction.

6. The injection molding equipment for hybrid insulators according to claim 1, characterized in that, The mold unit also includes a lateral core-pulling mechanism, which is used to drive the side cores inside the mold to move laterally.

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