An epoxy resin potting mold for a bushing

Abstract

The application relates to an epoxy resin pouring mold for insulators, belonging to the pouring mold field, which comprises a first mounting base, a second mounting base, an upper mold, a lower mold and a vacuum cover, the upper mold is fixedly installed on the lower surface of the first mounting base, the lower mold is fixedly installed on the upper surface of the second mounting base, the vacuum cover comprises an upper cover body and a lower cover body, the upper cover body is installed on the first mounting base, and the upper mold is located in the upper cover body, the lower cover body is installed on the second mounting base, and the lower mold is located in the lower cover body, when the upper cover body and the lower cover body are closed, the upper mold and the lower mold are located in the vacuum cover, a gas extraction hole is arranged in the side wall of the vacuum cover, the gas extraction hole is used for being connected with a gas extraction device, a pouring cavity is formed between the upper mold and the lower mold, and the mold between the pouring cavity and the vacuum cover is provided with a gas extraction channel. The application has the effect of reducing the problem of bubble residue in the pouring process.

Description

Technical Field

[0001] This application relates to the field of casting mold technology, and in particular to an epoxy resin casting mold for insulators. Background Technology

[0002] As a critical insulating component in power systems, the manufacturing process of insulators directly affects the reliability of power grid operation. Currently, the industry generally adopts epoxy resin casting technology, which requires ensuring material uniformity, absence of air bubbles, and dimensional accuracy. With the advancement of ultra-high voltage power grid construction, the requirements for the mechanical strength and electrical performance of insulators are increasing. However, in the existing production process, there are still some shortcomings in the vacuum extraction stage of insulator vacuum molds.

[0003] For example, the existing self-heating mold for vacuum casting of epoxy resin insulating casting parts with announcement number CN201342770Y has a technical solution consisting of a male template and a female template armored together, forming a cavity between the male template and the female template, and a power socket is provided on the male template and the female template. The power socket is connected to a vacuum pumping device and is connected to an external power source for power supply.

[0004] The above technical solution involves directly evacuating the mold. If the mold is not properly sealed, the vacuum level inside the injection cavity may be insufficient, affecting product quality. Utility Model Content

[0005] To reduce the problem of residual air bubbles during the casting process, this application provides an epoxy resin casting mold for insulators.

[0006] This application provides a technical solution using the following method: an epoxy resin casting mold for insulators includes a first mounting base, a second mounting base, an upper mold, a lower mold, and a vacuum cover. The upper mold is fixedly mounted on the lower surface of the first mounting base, and the lower mold is fixedly mounted on the upper surface of the second mounting base. The vacuum cover includes an upper cover body and a lower cover body. The upper cover body is mounted on the first mounting base, and the upper mold is located inside the upper cover body. The lower cover body is mounted on the second mounting base, and the lower mold is located inside the lower cover body. When the upper cover body and the lower cover body are closed, the upper mold and the lower mold are located inside the vacuum cover. The side wall of the vacuum cover has an air extraction hole for connecting an air extraction device. A casting cavity is formed between the upper mold and the lower mold. The mold located between the casting cavity and the vacuum cover has an air extraction channel.

[0007] By adopting the above technical solution, an evacuation hole for connecting the evacuation device is opened on the side wall of the vacuum chamber. After the upper and lower molds are closed, a closed casting cavity is formed, and an evacuation channel is provided between the casting cavity and the vacuum chamber. During the casting process, the evacuation device extracts air from inside the vacuum chamber through the evacuation hole on the vacuum chamber, creating a negative pressure inside the vacuum chamber. This negative pressure is then continuously extracted from inside the casting cavity through the evacuation channel, thereby reducing the internal air pressure of the casting cavity. During this process, air bubbles inside the casting cavity become unbalanced due to the pressure difference between the inside and outside, gradually expanding and bursting. Simultaneously, the low-pressure environment enhances the fluidity of the melt, making it easier for unbroken microbubbles to rise to the surface of the melt and ultimately be completely discharged by the evacuation device. This effectively reduces the probability of residual air bubbles during the casting process and ensures product quality.

[0008] Preferably, two molds are provided, and the two molds are installed at an interval between the first mounting base and the second mounting base.

[0009] By adopting the above technical solution and using two molds for simultaneous casting, production efficiency is improved.

[0010] Preferably, two air extraction channels are provided at intervals.

[0011] By adopting the above technical solution and setting two spaced air extraction channels, the air extraction efficiency of the air extraction device is improved, thereby reducing the risk of residual air bubbles.

[0012] Preferably, a groove is provided in the middle of the air extraction channel.

[0013] By adopting the above technical solution, a groove is set in the middle of the suction channel. When the suction device performs suction on the vacuum hood, a small amount of material in the casting chamber may be discharged with the airflow. The groove in the middle of the suction channel can buffer and temporarily store the discharged material. When the material flows through this groove, it can temporarily store some of the material, thereby greatly reducing the probability that the material will be directly sucked away by the suction device. This reduces the ineffective loss of material and avoids the equipment blockage or damage that may be caused by excessive material entering the suction device. Preferably, the upper surface of the lower cover is provided with an annular groove, and a sealing ring is provided in the annular groove.

[0014] By adopting the above technical solution and setting a sealing ring in the annular groove, the sealing performance between the upper and lower covers is improved, preventing outside air from entering the vacuum cover.

[0015] Preferably, both the upper and lower molds are provided with heating components for heating the mold. The heating components include heating rods, conductive plates, and power-conducting connectors. The two power-conducting connectors are respectively installed on the side walls of the first mounting base and the second mounting base. The two conductive plates are respectively fixedly installed on the surfaces of the first mounting base and the second mounting base and connected to the power-conducting connectors. The two heating rods are respectively fixedly connected to the first mounting base and the second mounting base and extend into the mold. The heating rods are connected to the conductive plates.

[0016] By adopting the above technical solution, the heating component is fixed to the side wall of the mounting base through the power-connecting base, and forms a stable power supply path with the conductive plate to ensure that the heating rod continuously receives power. The heating rod extends directly into the mold, and can accurately transfer heat to the casting cavity. By combining the dual heating of the upper mold and the lower mold, it is ensured that the insulators in the two molds are heated evenly. Preferably, the mold has a sprue, the sprue is connected to the pouring cavity through a pouring channel, the mold has a pouring nozzle that is detachably connected to the sprue, and a clearance opening is provided on the side wall of the vacuum shroud corresponding to the sprue, the pouring nozzle being connected to the sprue through the clearance opening.

[0017] When using the above-mentioned technical solutions, after the mold is cast, solidified material often remains at the connection between the injection nozzle and the gate, making it difficult to effectively clean this residue after the mold is opened. However, by adopting a detachable injection nozzle design, the injection nozzle can be removed as a whole, thus easily removing the solidified material at the connection and avoiding interference from residual material in subsequent production.

[0018] Preferably, a connecting seat is provided on the lower cover at the relief opening, and an annular sealing ring is provided inside the connecting seat. The injection nozzle is connected to the injection opening through the connecting seat.

[0019] By adopting the above technical solution, the connecting seat is fixed on the lower cover at the relief port, which greatly improves the connection stability between the relief port and the pouring nozzle and avoids loosening due to vibration and pressure fluctuations during pouring. At the same time, the annular sealing ring inside the connecting seat eliminates the docking gap through elastic deformation, which not only makes the connection tighter but also enhances the airtightness of the device, effectively preventing material leakage and ensuring stable pouring.

[0020] Preferably, the injection nozzle includes a head and a connecting part, the diameter of the connecting part is larger than the diameter of the head, and the diameter of the head gradually increases towards the connection point of the connecting part.

[0021] By adopting the above technical solution, the diameter of the nozzle gradually increases from the head to the connecting part, forming a transition structure. This not only enhances the overall rigidity of the nozzle but also makes the melt flow more smoothly. The larger diameter of the connecting part improves the stability and sealing of the nozzle and the connecting seat, ensuring efficient pouring.

[0022] Preferably, a mold clamping device is provided between the first mounting base and the second mounting base, and the mold clamping device is fixedly connected to the first mounting base and the second mounting base by bolts.

[0023] By adopting the above technical solution, the clamping device is fastened to the first and second mounting seats with bolts. During mold closing, the installation accuracy and structural stability guaranteed by the bolt connection can achieve precise alignment and tight locking of the upper and lower molds, effectively resisting the impact of mold closing and the high pressure in the injection cavity during the injection stage, and avoiding parting surface displacement and mold expansion.

[0024] In summary, this application includes at least one of the following beneficial technical effects: An evacuation hole for connecting an evacuation device is provided on the side wall of the vacuum chamber. After the upper and lower molds are closed, a closed casting cavity is formed, with an evacuation channel between the casting cavity and the vacuum chamber. During the casting process, the evacuation device extracts air from the vacuum chamber through the evacuation hole, creating a negative pressure inside the vacuum chamber. This negative pressure is then continuously extracted from the casting cavity through the evacuation channel, thereby reducing the internal air pressure. During this process, air bubbles in the casting cavity become unbalanced due to the pressure difference, gradually expanding and bursting. Simultaneously, the low-pressure environment enhances the fluidity of the melt, making it easier for unbroken microbubbles to rise to the surface and be completely expelled by the evacuation device. This effectively reduces the probability of residual air bubbles during casting and ensures product quality. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the epoxy resin casting mold used for insulators in the embodiments of this application.

[0026] Figure 2 This is a schematic diagram of the upper and lower molds of the epoxy resin casting mold used for insulators in the embodiments of this application.

[0027] Figure 3 This is a three-dimensional schematic diagram of the heating assembly of the epoxy resin casting mold for insulators in an embodiment of this application.

[0028] Figure 4 This is a perspective view of the epoxy resin casting mold for insulators equipped with a mold locking device, as described in this application embodiment. Explanation of reference numerals in the attached drawings: 1. First mounting base; 2. Second mounting base; 3. Upper mold; 4. Lower mold; 5. Vacuum cover; 51. Upper cover body; 52. Lower cover body; 6. Evacuation hole; 7. Gating cavity; 8. Evacuation channel; 9. Groove; 10. Sealing ring; 11. Heating assembly; 111. Heating rod; 112. Conductive plate; 113. Power connection plate; 12. Sprue; 13. Sprue channel; 14. Sprue nozzle; 141. Head; 142. Connecting part; 15. Relief port; 16. Connecting seat; 17. Sealing ring; 18. Mold clamping device; 19. Fixed seat; 20. Positioning guide post. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0030] This application discloses an epoxy resin casting mold for insulators. (Refer to...) Figure 1 and 2 The casting mold includes a first mounting base 1, a second mounting base 2, an upper mold 3, a lower mold 4, and a vacuum chamber 5. The upper mold 3 is fixedly mounted to the lower surface of the first mounting base 1 by bolts, and the lower mold 4 is fixedly mounted to the upper surface of the second mounting base 2 by bolts. The vacuum chamber 5 includes an upper cover body 51 and a lower cover body 52. ​​The connection between the upper cover body 51 and the first mounting base 1 is sealed with a sealing strip, and the upper mold 3 is located inside the upper cover body 51. The connection between the lower cover body 52 and the second mounting base 2 is sealed with a sealing strip, and the lower mold 4 is located inside the lower cover body 52. ​​The lower mold 4 is provided with positioning guide posts 20, which can achieve precise positioning with the upper mold 3. When the upper cover body 51 and the lower cover body 52 are closed, the upper mold 3 and the lower mold 4 are located inside the vacuum chamber 5. The side wall of the lower cover body 52 has an air extraction hole 6, which is used to connect an air extraction device. A casting cavity 7 is formed between the upper mold 3 and the lower mold 4. The mold located between the casting cavity 7 and the vacuum chamber 5 has an air extraction channel 8. In this embodiment, two molds are used, installed alternately between the first mounting base 1 and the second mounting base 2. Two spaced-apart air extraction channels 8 are also provided in this embodiment. The air extraction device in this embodiment is an air pump. During the casting process, the air extraction device extracts air from the vacuum chamber 5 through the air extraction holes 6 on the vacuum chamber 5, creating a negative pressure inside the vacuum chamber 5. This negative pressure is then continuously extracted from the casting cavity 7 through the air extraction channels 8, thereby reducing the internal air pressure of the casting cavity 7. During this process, air bubbles in the casting cavity 7 become unbalanced due to the pressure difference between the inside and outside, gradually expanding and bursting. Simultaneously, the low-pressure environment enhances the fluidity of the melt, making it easier for unbroken microbubbles to rise to the surface of the melt and be completely expelled by the air extraction device. This effectively reduces the probability of residual air bubbles during the casting process, ensuring product quality. By using two molds for simultaneous casting, the efficiency of mold production is improved. By using two spaced-apart air extraction channels 8, the air extraction efficiency of the air extraction device is improved, thereby reducing the risk of residual air bubbles.

[0031] Reference Figure 2 To further reduce material loss, a groove 9 is provided in the middle of the extraction channel 8. With the extraction device evacuating the vacuum chamber 5, a small amount of material in the casting chamber 7 may be discharged with the airflow. The groove 9 in the middle of the extraction channel 8 can buffer and temporarily store the discharged material. When material flows through this groove, it can temporarily store some of the material, thus significantly reducing the probability of the material being directly extracted by the extraction device. This reduces ineffective material loss and avoids potential equipment blockage or damage caused by excessive material entering the extraction device.

[0032] Reference Figure 2 Furthermore, an annular groove is provided on the upper surface of the lower cover 52, and a sealing ring 10 is provided inside the annular groove. By providing a sealing ring 10 inside the annular groove, the sealing performance between the upper cover 51 and the lower cover 52 is improved, preventing outside air from entering the vacuum cover 5.

[0033] Reference Figure 3 Furthermore, both the upper mold 3 and the lower mold 4 are equipped with heating components 11 for heating the mold. Each heating component 11 includes a cylindrical heating rod 111, a rectangular conductive plate 112, and a power-conducting connector 113. Two power-conducting connectors 113 are respectively mounted on the side walls of the first mounting base 1 and the second mounting base 2. Two conductive plates 112 are respectively fixedly mounted on the surfaces of the first mounting base 1 and the second mounting base 2 and connected to the power-conducting connectors 113. Two heating rods 111 are respectively fixedly connected to the first mounting base 1 and the second mounting base 2 and extend into the mold, with the heating rods 111 connected to the conductive plates 112. This heating component 11 is fixed to the side wall of the mounting base via the power-conducting connectors 113, forming a stable power supply path with the conductive plates 112, ensuring that the heating rods 111 continuously receive electrical energy. The heating rods 111 extend directly into the mold, accurately transferring heat to the casting cavity 7. By combining the dual heating of the upper mold 3 and the lower mold 4, uniform heating of the insulators within both molds is ensured.

[0034] Reference Figure 2 and Figure 4Furthermore, the mold has a sprue 12, which communicates with the casting cavity 7 via a sprue channel 13. The mold also has a sprue nozzle 14 detachably connected to the sprue 12. A clearance opening 15 is provided on the side wall of the vacuum cover 5 corresponding to the sprue 12, and the sprue nozzle 14 is connected to the sprue 12 via the clearance opening 15. The sprue nozzle 14 includes a head 141 and a connecting portion 142. The diameter of the connecting portion 142 is larger than the diameter of the head 141, and the diameter of the head 141 gradually increases towards the connection point of the connecting portion 142. In this embodiment, two sprue nozzles 14 are connected and fixed to a fixed base 19. A connecting base 16 is provided on the lower cover body located at the clearance opening 15, and an annular sealing ring 17 is provided inside the connecting base 16. The sprue nozzle 14 is connected to the sprue 12 via the connecting base 16. After the mold is cast, solidified material often remains at the connection point between the sprue nozzle 14 and the sprue 12, and it is difficult to effectively clean this residue after the mold is opened. By adopting a detachable pouring nozzle 14 design, the entire pouring nozzle 14 can be removed, allowing for easy removal of solidified material at the connection point and preventing residual material from interfering with subsequent production. The diameter of the pouring nozzle 14 gradually increases from its head 141 to the connection portion 142, forming a transition structure that enhances the overall rigidity of the pouring nozzle 14 and facilitates smoother melt flow. The larger diameter of the connection portion 142 improves the stability and sealing of the connection between the pouring nozzle 14 and the connecting seat 16, ensuring efficient pouring. Fixing the connecting seat 16 to the lower cover 52 at the relief port 15 significantly improves the connection stability between the relief port 15 and the pouring nozzle 14, preventing loosening due to vibration or pressure fluctuations during pouring. Simultaneously, the annular sealing ring 17 within the connecting seat 16 eliminates the connection gap through elastic deformation, resulting in a tighter connection and enhanced sealing of the device, effectively preventing material leakage and ensuring stable pouring.

[0035] Reference Figure 4 Furthermore, a cuboid mold clamping device 18 is provided between the first mounting base 1 and the second mounting base 2. The mold clamping device 18 is fixedly connected to the first mounting base 1 and the second mounting base 2 by bolts. The mold clamping device 18 is fastened between the first and second mounting bases 2 by bolts. When the mold is closed, the installation accuracy and structural stability guaranteed by the bolt connection can realize the precise alignment and tight locking of the upper mold 3 and the lower mold 4, effectively resisting the impact of mold closing and the high pressure in the injection cavity 7 during the injection stage, and avoiding parting surface offset and mold expansion.

[0036] The implementation principle of an epoxy resin casting mold for insulators according to an embodiment of this application is as follows: During the casting process, the air extraction device extracts air from the vacuum chamber 5 through the air extraction hole 6, creating a negative pressure inside the vacuum chamber 5. This negative pressure is then continuously extracted from the casting cavity 7 through the air extraction channel 8, thereby reducing the internal air pressure of the casting cavity 7. During this process, air bubbles in the casting cavity 7 become unbalanced due to the pressure difference between the inside and outside, gradually expanding and bursting. Simultaneously, the low-pressure environment enhances the fluidity of the melt, making it easier for unbroken microbubbles to rise to the surface of the melt and ultimately be completely discharged through the air extraction device. This effectively reduces the probability of residual air bubbles during the casting process and ensures product quality.

[0037] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An epoxy resin casting mold for insulators, characterized in that: The system includes a first mounting base (1), a second mounting base (2), an upper mold (3), a lower mold (4), and a vacuum chamber (5). The upper mold (3) is fixedly mounted on the lower surface of the first mounting base (1), and the lower mold (4) is fixedly mounted on the upper surface of the second mounting base (2). The vacuum chamber (5) includes an upper cover (51) and a lower cover (52). The upper cover (51) is mounted on the first mounting base (1), and the upper mold (3) is located inside the upper cover (51). The lower cover (52) is mounted on the lower surface of the second mounting base (2). On the second mounting base (2), and the lower mold (4) is located inside the lower cover (52), when the upper cover (51) and the lower cover (52) are closed, the upper mold (3) and the lower mold (4) are located inside the vacuum cover (5), the side wall of the vacuum cover (5) is provided with an air extraction hole (6), the air extraction hole (6) is used to connect an air extraction device, a casting cavity (7) is formed between the upper mold (3) and the lower mold (4), and the mold located between the casting cavity (7) and the vacuum cover (5) has an air extraction channel (8).

2. The epoxy resin casting mold for insulators according to claim 1, characterized in that: Two molds are provided, and the two molds are installed at an interval between the first mounting base (1) and the second mounting base (2).

3. The epoxy resin casting mold for insulators according to claim 1, characterized in that: The air extraction channel (8) is provided in two intervals.

4. The epoxy resin casting mold for insulators according to claim 3, characterized in that: A groove (9) is provided in the middle of the air extraction channel (8).

5. The epoxy resin casting mold for insulators according to claim 2, characterized in that: The upper surface of the lower cover (52) is provided with an annular groove, and a sealing ring (10) is provided in the annular groove.

6. The epoxy resin casting mold for insulators according to claim 2, characterized in that: Both the upper mold (3) and the lower mold (4) are provided with heating components (11) for heating the mold. The heating components (11) include heating rods (111), conductive plates (112) and power-conducting connectors (113). The two power-conducting connectors (113) are respectively installed on the side walls of the first mounting base (1) and the second mounting base (2). The two conductive plates (112) are respectively fixedly installed on the surfaces of the first mounting base (1) and the second mounting base (2) and connected to the power-conducting connectors (113). The two heating rods (111) are respectively fixedly connected to the first mounting base (1) and the second mounting base (2) and extend into the mold. The heating rods (111) are connected to the conductive plates (112).

7. The epoxy resin casting mold for insulators according to claim 1, characterized in that: The mold has a sprue (12), which is connected to the pouring cavity (7) through a pouring channel (13). The mold has a pouring nozzle (14) that is detachably connected to the sprue (12). A clearance port (15) is provided on the side wall of the vacuum cover (5) corresponding to the sprue (12). The pouring nozzle (14) is connected to the sprue (12) through the clearance port (15).

8. The epoxy resin casting mold for insulators according to claim 7, characterized in that: A connecting seat (16) is provided on the lower cover located at the relief opening (15). An annular sealing ring (17) is provided inside the connecting seat (16). The injection nozzle (14) is connected to the injection port (12) through the connecting seat (16).

9. The epoxy resin casting mold for insulators according to claim 8, characterized in that: The pouring nozzle (14) includes a head (141) and a connecting part (142). The diameter of the connecting part (142) is larger than the diameter of the head (141), and the diameter of the head (141) gradually increases towards the connection point of the connecting part (142).

10. The epoxy resin casting mold for insulators according to claim 1, characterized in that: A mold clamp (18) is provided between the first mounting base (1) and the second mounting base (2), and the mold clamp (18) is fixedly connected to the first mounting base (1) and the second mounting base (2) by bolts.

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