Double-runner mold for stress cone

Abstract

The utility model discloses a double-runner mold for a stress cone, which comprises a main mold body, the main mold body is provided with a main mold cavity and a prefabricated part arranged in the main mold cavity, a forming cavity is formed between the prefabricated part and the main mold cavity, the main mold body is further provided with a first injection channel communicated with the bottom of the forming cavity and a second injection channel communicated with the top of the forming cavity, the first injection channel is used for injecting an injection material into the forming cavity; the double-flow-channel mold for the stress cone is configured in the mode that a first injection channel is used for injecting a bottom space from the bottom of a molding cavity to a preset height, at least part of a prefabricated part is located in the bottom space, a second injection channel is used for injecting a top space from the preset height to the top of the molding cavity, and a molded part is subjected to injection molding in the molding cavity. The forming part and the prefabricated part are formed into a whole. The double-runner mold for the stress cone can improve the yield of stress cone production.

Description

Technical Field

[0001] The utility model relates to the field of stress cone manufacturing equipment, in particular to a double-flow channel mold for the stress cone. Background Art

[0002] In the related art, the material used for the 35kVGIS stress cone is solid silicone, and the mold structure is to feed from two points on the top of the product. However, due to the limitations of the product structure and the insufficient process performance of the rubber compound, the product qualification rate and production efficiency have been at a low level. In order to solve this problem, liquid silicone with better process performance needs to be used as the material, and the product structure should be redesigned while keeping the product appearance and dimensions unchanged. However, the wall thickness of the semi-conductive stress cone of the new structure is thinner, and the narrowest dimension of the rubber compound is 3mm. When the rubber compound passes through, the semi-conductive stress cone is not enough to support the pressure generated during the injection of the rubber compound, resulting in the deformation of the ball head of the semi-conductive stress cone. There are defects at the junction of the semi-conductivity and insulation of the product, which affects the product quality and the product qualification rate is low. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention proposes a double-flow channel mold for a stress cone, which can improve the yield rate.

[0004] The double-flow channel mold for a stress cone according to an embodiment of the present invention includes:

[0005] A main mold body having a main mold cavity and a preform disposed in the main mold cavity, wherein a molding cavity is formed between the preform and the main mold cavity, and the main mold body further having a first injection channel connected to the bottom of the molding cavity and a second injection channel connected to the top of the molding cavity, wherein the first injection channel is used to inject injection material into the molding cavity;

[0006] In which, the dual-channel mold for the stress cone is configured as follows: the first injection channel is used to inject the bottom of the molding cavity to the bottom space of a preset height, at least part of the preform is located within the bottom space, and the second injection channel is used to inject the preset height to the top space of the top of the molding cavity.

[0007] The double-channel mold for stress cone according to the embodiment of the present invention has at least the following beneficial effects: the injection material is injected from the bottom of the molding cavity to the bottom space within the molding cavity through the first injection channel, and when the injection material continues to be injected into the top space within the molding cavity through the second injection channel, the injection material in the bottom space will support the preform, and the preform can withstand higher injection pressure, making it less likely for the preform to deform, avoiding defects in the joint position between the molded part and the preform after molding, and improving the product yield.

[0008] According to some embodiments of the present invention, the main mold body includes a first mold base and a first template, the first template has a first parting surface away from the first mold base and a first runner surface facing the first mold base, the first parting surface is provided with a first mold groove, the first runner surface is provided with a first runner connected to the first mold groove, at least part of the preform is located within the first mold groove, a second runner connected to the first runner is provided between the first mold base and the first template, and the first runner and the second runner together form the first injection channel.

[0009] According to some embodiments of the present invention, the first flow channel surface is provided with a first flow channel groove, and the first flow channel groove and the first mold base are combined to form the second flow channel.

[0010] According to some embodiments of the present invention, the first template has at least two first mold grooves and first runners corresponding to the first mold grooves, each first mold groove is connected to at least one first runner, the first mold base has a second runner connected to each first runner, and all the first runners and all the second runners together form the first injection channel.

[0011] According to some embodiments of the present invention, the main mold body further has an exhaust channel connected to the top of the molding cavity, and the exhaust channel is used to exhaust the gas in the molding cavity.

[0012] According to some embodiments of the present invention, the main mold body includes a first mold base and a first template, the first template has a first mold groove and a first exhaust channel connected to the first mold groove, the first mold base has a second exhaust channel connected to the first exhaust channel, and the first exhaust channel and the second exhaust channel together form the exhaust channel.

[0013] According to some embodiments of the present invention, the main mold body also includes a second mold base and a second template, the second template has a second parting surface away from the second mold base and a second runner surface facing the second mold base, the second parting surface is provided with a second mold groove, the second runner surface is provided with a third runner connected to the second mold groove, and a fourth runner connected to the third runner is provided between the second mold base and the second template, and the third runner and the fourth runner together form the second injection channel.

[0014] According to some embodiments of the present invention, the second flow channel surface is provided with a second flow channel groove, and the second flow channel groove and the second mold base are combined to form the fourth flow channel.

[0015] According to some embodiments of the present invention, the main mold body includes a first mold body, a second mold body and an ejector rod. The first mold body is arranged on the second mold body, and the ejector rod is connected to the first mold body for hanging the mold to separate the first mold body and the second mold body.

[0016] According to some embodiments of the present invention, the first injection channel is connected to the bottom surface of the main mold body or the side surface of the main mold body, and the second injection channel is connected to the top surface of the main mold body or the side surface of the main mold body.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a schematic cross-sectional view of a double-flow channel mold for a stress cone according to an embodiment of the present invention;

[0020] Figure 2 This is a side view schematic diagram of a double-flow channel mold for a stress cone according to an embodiment of the present utility model;

[0021] Figure 3 This is a schematic top view of a double-flow channel mold for a stress cone according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic top view of the second template in a double-runner mold for a stress cone according to an embodiment of the present invention;

[0023] Figure Number:

[0024] Main mold body 100; main mold cavity 110; preform 120; molding cavity 130; first injection channel 140; second injection channel 150; exhaust channel 160;

[0025] First mold body 200; first mold base 210; first mold plate 220;

[0026] Second mold body 300; second mold base 310; second mold plate 320;

[0027] Forming column 400;

[0028] Ejector rod 500. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of this utility model, "a number" refers to one or more, and "a plurality" refers to two or more. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] It should be noted that the stress cone is a hollow cone designed to be placed over a cable. It consists of an insulating portion and a semi-conductive portion. The insulating portion is placed over the cable's insulator, while the semi-conductive portion is placed over the cable's outer shielding layer. The connecting end of the semi-conductive portion and the insulating portion is embedded within the insulating portion.

[0034] Reference Figures 1 to 4 As shown, an embodiment of the present invention proposes a double-runner mold for a stress cone, including: a main mold body 100.

[0035] The main mold body 100 has a main mold cavity 110 and a preform 120 disposed within the main mold cavity 110, with a molding cavity 130 formed between the preform 120 and the main mold cavity 110. Specifically, the main mold body 100 includes a first mold body 200 and a second mold body 300. The first mold body 200 and the second mold body 300 form the main mold cavity 110 when the mold body is closed. The preform 120 is preset within the first mold body 200. When the first mold body 200 and the second mold body 300 are closed to form the main mold cavity 110, the preform 120 is located within the main mold cavity 110 and forms the molding cavity 130 between the preform 120 and the main mold cavity 110. After the molded part is formed in the molding cavity 130, the molded part and the preform 120 are connected to form an integrated stress cone. Finally, the stress cone is removed from the main mold cavity 110. In this embodiment, the main mold body 100 also includes a forming column 400 arranged at the center position of the main mold cavity 110. The forming column 400 is used to form the hollow part of the stress cone. Specifically, the forming column 400 includes a main column portion, a first end cover portion and a second end cover portion. The first end cover portion and the second end cover portion are respectively connected to the two ends of the main column portion, wherein at least one of the first end cover portion and the second end cover portion is detachably connected to the main column portion, for example, detachably connected by bolts, so as to facilitate the removal of the first end cover portion and / or the second end cover portion to remove the stress cone arranged outside the main column portion, and the forming column 400 is detachably connected to the main mold body 100 by bolts, the preform 120 is formed of insulating material, and the forming part is formed of semi-conductive material, and the preform 120 and the forming part are formed together on the outer peripheral surface of the forming column 400.

[0036] It should be noted that the semi-conductive part in the preform 120 is covered on the forming column 400, and one end of the semi-conductive part extends outward from the forming column 400 at an angle to form a conical spherical head. The insulating part material needs to enter and fill the groove formed between the conical spherical head and the outer peripheral surface of the forming column 400. When the injection pressure of the liquid insulating material is too high, the protruding conical spherical head will be deformed, thereby causing the semi-conductive part and the insulating part to be not properly combined, thereby reducing the product qualification rate.

[0037] The main mold body 100 also has a first injection channel 140 connected to the bottom of the molding cavity 130 and a second injection channel 150 connected to the top of the molding cavity 130. The first injection channel 140 is used to inject the injection material into the molding cavity 130; wherein, the double-channel mold for the stress cone is configured as follows: the first injection channel 140 is used to inject the bottom space from the bottom of the molding cavity 130 to a preset height, and at least part of the preform 120 is located in the bottom space; the second injection channel 150 is used to inject the top space from a preset height to the top of the molding cavity 130, and injection-molded the molded part in the molding cavity 130, and the molded part and the preform 120 are molded as one piece.

[0038] In this embodiment, the preset height refers to the position of the top of the preform 120, but does not exceed the top of the preform 120. As another embodiment, it can also exceed the top of the preform 120.

[0039] The first injection channel 140 is connected to the bottom of the molding cavity 130. During the injection process, the liquid injection material moves upward from the bottom of the molding cavity 130. The gravity of the liquid injection material offsets the injection pressure, resulting in a lower injection pressure within the molding cavity 130 and a smoother injection process. When the liquid injection material is injected to a predetermined height in the molding cavity 130 through the first injection channel 140, this portion of the injection material will envelop the preform 120, increasing the clamping force between the preform 120 and the molding column 400 and enabling it to withstand higher injection pressures. Furthermore, the conical spherical head of the preform 120 is located at the top of the preform 120. At this point, the conical spherical head is only affected by external forces from the top of the injection material, resulting in less external forces and less deformation. When the second injection channel 150 injects injection material again from the top of the molding cavity 130 into the top space, the injection material in the bottom space supports the conical spherical head, resisting the injection pressure exerted by the injection material in the top space, making the conical spherical head even less susceptible to deformation.

[0040] It is worth understanding that when the injection material is injected from the bottom of the molding cavity 130 to the bottom space within the molding cavity 130 through the first injection channel 140, and when the injection material continues to be injected into the top space within the molding cavity 130 through the second injection channel 150, the injection material in the bottom space will support the preform 120, and the preform 120 can withstand a higher injection pressure, making it less likely for the preform 120 to deform, avoiding defects in the joint position between the molded part and the preform 120 after molding, and improving the product yield.

[0041] Reference Figure 1 、 Figure 3 and Figure 4 As shown, in some specific embodiments of the present invention, the main mold body 100 includes a first mold base 210 and a first template 220, the first template 220 has a first parting surface away from the first mold base 210 and a first runner surface facing the first mold base 210, the first parting surface is provided with a first mold groove, the first runner surface is provided with a first runner connected to the first mold groove, at least part of the preform 120 is located within the first mold groove, a second runner connected to the first runner is provided between the first mold base 210 and the first template 220, and the first runner and the second runner together form a first injection channel 140.

[0042] In this embodiment, the first mold base 210 and the first mold plate 220 constitute the first mold body 200. These are connected to the first injection channel 140 via an injection molding machine. The injection molding machine injects the material, which flows from the outside of the main mold body 100 through the second flow channel to the first flow channel and then into the first mold cavity. The majority of the preform 120 is located within the first mold cavity, allowing the injection material in the bottom space to assist in securing the preform 120.

[0043] Reference Figure 4 As shown, in some specific embodiments of the present invention, the first flow channel surface is provided with a first flow channel groove, and the first flow channel groove and the first mold base 210 are surrounded to form a second flow channel.

[0044] It is worth noting that the first flow channel surface is provided with a first flow channel groove, which makes processing of the first flow channel groove more convenient. The first mold base 210 can be formed by a flat surface and the first flow channel groove to form the second flow channel, or the first mold base 210 can also be provided with a flow channel groove on a surface opposite to the first mold plate 220, and the flow channel groove and the first flow channel groove together form the second flow channel.

[0045] Reference Figure 3 As shown, in some specific embodiments of the present invention, the first template 220 has at least two first mold grooves and first runners corresponding to the first mold grooves, each first mold groove is connected to at least one first runner, and the first mold base 210 has a second runner connected to each first runner, and all the first runners and all the second runners together form a first injection channel 140.

[0046] It is worth noting that the main mold body 100 includes multiple main mold cavities 110, enabling the molding of multiple stress cones in a single injection, thus improving production efficiency. Multiple interconnected first and second flow channels connect the multiple first mold slots, that is, the multiple main mold cavities 110, respectively, enabling the injection of molded parts in all main mold cavities 110, greatly improving production efficiency. In this embodiment, the main mold body 100 includes eight main mold cavities 110, capable of producing eight stress cones in a single injection. In this embodiment, the first mold slots are used to form a portion of the main mold cavities 110.

[0047] Reference Figure 3 As shown, in some embodiments of the present invention, the main mold body 100 further has an exhaust channel 160 connected to the top of the molding cavity 130 , and the exhaust channel 160 is used to exhaust the gas in the molding cavity 130 .

[0048] It is important to understand that excess air is exhausted through the vent channel 160 at the top of the molding cavity 130. Furthermore, the injection of the liquid injection material and the exhaust of air from the molding cavity 130 do not interfere with each other. This prevents air from remaining in the liquid injection material and causing defects such as voids and bubbles, thereby improving the quality of the molded part. It should be noted that the vent channel 160 exists independently of the second injection channel 150.

[0049] Reference Figure 4 As shown, in some specific embodiments of the present invention, the main mold body 100 includes a first mold base 210 and a first template 220, the first template 220 has a first mold groove and a first exhaust channel connected to the first mold groove, the first mold base 210 has a second exhaust channel connected to the first exhaust channel, and the first exhaust channel and the second exhaust channel together form an exhaust channel 160.

[0050] It is worth noting that when the main mold body 100 has multiple main mold cavities 110, it is also necessary to have multiple exhaust channels 160 to enable smooth exhaust of each main mold cavity 110. In this embodiment, a single main mold cavity 110 has two opposing exhaust channels 160 to improve the exhaust efficiency of the main mold cavity 110.

[0051] Reference Figure 3 and Figure 4 As shown, in some specific embodiments of the present invention, the main mold body 100 also includes a second mold base 310 and a second template 320, the second template 320 has a second parting surface away from the second mold base 310 and a second runner surface facing the second mold base 310, the second parting surface is provided with a second mold groove, the second runner surface is provided with a third runner connected to the second mold groove, a fourth runner connected to the third runner is provided between the second mold base 310 and the second template 320, and the third runner and the fourth runner together form a second injection channel 150.

[0052] In this embodiment, the second mold base 310 and the second mold plate 320 constitute the second mold body 300. The injection material flows from the outside of the main mold body 100 through the fourth runner, the third runner, and then into the main mold cavity 110, achieving injection of the injection material in the top space. The surface of the second mold plate 320 facing away from the second mold base 310 and the surface of the first mold plate 220 facing away from the first mold base 210, i.e., the first and second parting surfaces, are opposite. This allows the second mold cavity and the first mold cavity to enclose the main mold cavity 110. When the first and second parting surfaces separate, the formed stress cone can be removed from the main mold cavity 110.

[0053] Reference Figure 3 and Figure 4 As shown, in some specific embodiments of the present invention, the second flow channel surface is provided with a second flow channel groove, and the second flow channel groove and the second mold base 310 are surrounded to form a fourth flow channel.

[0054] It is worth noting that the second runner surface is directly provided with the second runner groove, which is more convenient to process. The second mold base 310 can be formed by combining a flat surface with the second runner groove to form the fourth runner, or the second mold base 310 can also be provided with a runner groove on a surface facing the second mold plate 320, and this runner groove and the second runner groove together form the fourth runner.

[0055] Reference Figure 1 As shown, in some specific embodiments of the present invention, the main mold body 100 includes a first mold body 200, a second mold body 300 and an ejector rod 500. The first mold body 200 is arranged on the second mold body 300, and the ejector rod 500 is connected to the first mold body 200 to be used for hanging the mold to separate the first mold body 200 and the second mold body 300.

[0056] It is worth understanding that the first mold body 200 is ejected from the side by the ejector rod 500 to achieve separation of the first mold body 200 and the second mold body 300, so as to facilitate the removal of the stress cone in the main mold cavity 110 and facilitate the next stress cone processing, thereby improving production efficiency.

[0057] Reference Figure 1 and Figure 2 As shown, in some specific embodiments of the present invention, the first injection channel 140 is connected to the bottom surface of the main mold body 100 or the side surface of the main mold body 100, and the second injection channel 150 is connected to the top surface of the main mold body 100 or the side surface of the main mold body 100.

[0058] In this embodiment, the first injection channel 140 and the second injection channel 150 are both connected to the main mold cavity 110 from the side of the main mold body 100 to achieve injection. A dedicated injection nozzle is provided outside the main mold body 100 to connect the injection machine to the first injection channel 140 and the second injection channel 150 within the main mold body 100.

[0059] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A double-runner mold for a stress cone, characterized in that: include: A main mold body having a main mold cavity and a preform disposed in the main mold cavity, wherein a molding cavity is formed between the preform and the main mold cavity, and the main mold body further having a first injection channel connected to the bottom of the molding cavity and a second injection channel connected to the top of the molding cavity, wherein the first injection channel is used to inject injection material into the molding cavity; In which, the dual-channel mold for the stress cone is configured as follows: the first injection channel is used to inject the bottom of the molding cavity to the bottom space of a preset height, at least part of the preform is located within the bottom space, and the second injection channel is used to inject the preset height to the top space of the top of the molding cavity.

2. The double-runner mold for stress cone according to claim 1, characterized in that: The main mold body includes a first mold base and a first template, the first template has a first parting surface away from the first mold base and a first runner surface facing the first mold base, the first parting surface is provided with a first mold groove, the first runner surface is provided with a first runner connected to the first mold groove, at least part of the preform is located within the first mold groove, a second runner connected to the first runner is provided between the first mold base and the first template, and the first runner and the second runner together form the first injection channel.

3. The double-runner mold for stress cone according to claim 2, characterized in that: The first flow channel surface is provided with a first flow channel groove, and the first flow channel groove and the first mold base are combined to form the second flow channel.

4. The double-runner mold for stress cone according to claim 2, characterized in that: The first template has at least two first mold cavities and first runners corresponding to the first mold cavities, each first mold cavity is connected to at least one first runner, the first mold base has a second runner connected to each first runner, and all the first runners and all the second runners together form the first injection channel.

5. The double-runner mold for stress cone according to claim 1, characterized in that: The main mold body also has an exhaust channel connected to the top of the molding cavity, and the exhaust channel is used to exhaust the gas in the molding cavity.

6. The double-runner mold for stress cone according to claim 5, characterized in that: The main mold body includes a first mold base and a first mold plate, the first mold plate has a first mold groove and a first exhaust channel connected to the first mold groove, the first mold base has a second exhaust channel connected to the first exhaust channel, and the first exhaust channel and the second exhaust channel together form the exhaust channel.

7. The double-runner mold for stress cone according to claim 1, characterized in that: The main mold body also includes a second mold base and a second template, the second template has a second parting surface away from the second mold base and a second runner surface facing the second mold base, the second parting surface is provided with a second mold groove, the second runner surface is provided with a third runner connected to the second mold groove, and a fourth runner connected to the third runner is provided between the second mold base and the second template, and the third runner and the fourth runner together form the second injection channel.

8. The double-runner mold for stress cone according to claim 7, characterized in that: The second flow channel surface is provided with a second flow channel groove, and the second flow channel groove and the second mold base are combined to form the fourth flow channel.

9. The double-runner mold for stress cone according to claim 1, characterized in that: The main mold body includes a first mold body, a second mold body and an ejector rod. The first mold body is arranged on the second mold body. The ejector rod is connected to the first mold body to be used for hanging the mold to separate the first mold body and the second mold body.

10. The double-runner mold for stress cone according to claim 1, characterized in that: The first injection channel is connected to the bottom surface of the main mold body or the side surface of the main mold body, and the second injection channel is connected to the top surface of the main mold body or the side surface of the main mold body.

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