Reverse injection mold for mixed insulator

Abstract

The utility model provides a reverse injection mold for a mixed insulator, which is characterized in that a movable injection mold, a cavity assembly and a fixed injection mold are sequentially stacked from bottom to top, and the movable injection mold, the cavity assembly and the movable injection mold are encircled in the cavity assembly to form a cavity body; a positioning boss for placing a parison is arranged on the movable injection mold in the cavity body, a positioning device is arranged on the fixed injection mold in the cavity body, and the positioning boss and the positioning device are correspondingly arranged; a plurality of runners communicated with the cavity body are formed in the cavity assembly, and glue injection openings communicated with the runners are formed in the injection movable mold. The clamping and positioning of the glass insert are facilitated, the molding deviation of a glass insulator piece is ensured to meet the requirement, the filling of an internal cavity of the glass insert is facilitated, the insulator piece is more stable in the cavity, meanwhile, due to the gravity action, the flow speed of a sizing material in a runner is more controllable, the filling effect is improved, and the defects of air holes and the like are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of insulator injection molds, in particular to a hybrid insulator reverse injection mold. Background Art

[0002] In the field of injection molding, the quality of mold technology directly impacts the efficiency and quality of product molding. Traditional mold technology imposes strict limits on parameters such as the dimensional accuracy of the molded product, the structure and precision of the included inserts, and other parameters during the R&D phase. During mold design, as long as the product's formability is structurally guaranteed and the molding properties of the materials used are taken into account, production requirements can be met. However, for inserts with complex structures and large dimensional and positional deviations, the mold design difficulty and structural complexity pose significant challenges. This is especially true for low-load, brittle, and highly deviated inserts, where mold design tolerance and molding reliability are particularly important.

[0003] Chinese utility model patent publication number CN113199706A provides a metal insert integral molding injection mold, which is a conventional insert injection mold with replaceable inserts, but it can only be used to mold products with high insert dimensional accuracy and stability; Chinese utility model patent publication number CN217704391U provides an insert injection mold for an electric tool housing, in which an insert groove is provided on the molding part of the electric tool housing, and the assembly position of the insert is positioned by a positioning column, which is installed on the upper end face of the fixed column, and the fixed column is a fixing mechanism arranged on the side of the movable mold, which can avoid the insert displacement phenomenon during the molding process, but does not take into account the molding tolerance of inserts with large size and shape deviation.

[0004] In addition, most existing vertical injection molds use fixed molds for glue injection. However, for glass porcelain insulators, since they need to be clamped and positioned up and down, the upper surface is pressed downward by an elastic rubber ring fixed on the fixed mold plate. The lower positioning surface has a smaller plane area that can be used for positioning than the upper positioning surface. Moreover, due to the different weights of each glass insulator component, although an adaptive centering structure can be used, positioning errors will still exist. Therefore, there is an urgent need to provide a solution to improve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a hybrid insulator reverse injection mold, which can improve the molding precision and molding quality of the hybrid insulator during injection molding.

[0006] The utility model provides a hybrid insulator reverse injection mold, which is stacked with an injection movable mold, a cavity assembly and an injection fixed mold in sequence from bottom to top, and the injection movable mold, the cavity assembly and the injection movable mold are surrounded in the cavity assembly to form a cavity body, the injection movable mold is located in the cavity body and is provided with a positioning boss for placing a blank, and the injection fixed mold is located in the cavity body and is provided with a positioning device, and the positioning boss is arranged corresponding to the positioning device; a plurality of flow channels connected to the cavity body are provided in the cavity assembly, and a glue injection port connected to the flow channels is provided on the injection movable mold.

[0007] The reverse injection mold provided by the utility model adopts the reverse injection glue feeding method to first inject and fill the bottom of the blank when injection molding the insulator, and can also play a supporting role for the blank, which is beneficial to improving the accuracy of the blank injection molding. In addition, it is also beneficial to filling the internal space of the cavity and improving the position stability of the blank during the filling process. At the same time, due to the effect of gravity, the flow rate of the glue in the cavity body and the runner is more controllable, which is beneficial to improving the filling effect and reducing defects such as air holes.

[0008] Optionally, the runner in the cavity assembly is divided into a first runner and a second runner, and the connection between the first runner and the cavity body is closer to the injection mold than the second runner; along the projection direction from the bottom to the top, the first runner and the second runner are staggered with each other.

[0009] Optionally, along the projection direction from the bottom to the top, the first flow channel and the second flow channel are both arranged in an arc shape.

[0010] Optionally, the injection port includes a first injection port and a second injection port that are independent of each other, and the first injection port and the second injection port are both vertically opened on the injection dynamic mold, the first injection port is interconnected with the first flow channel, and the second injection port is interconnected with the second flow channel.

[0011] Optionally, the cavity assembly includes a left mold core and a right mold core that are assembled with each other, and the cavity body is formed at the joint between the left mold core and the right mold core; multiple flow channels are symmetrically arranged on the left mold core and the right mold core, and the end points of the flow channels are located at the joint between the left mold core and the right mold core.

[0012] Optionally, the positioning device includes a base plate, an elastic member and a resisting member, two ends of the elastic member are respectively connected to the base plate and the resisting member, and the resisting member elastically resists the parison.

[0013] Optionally, the positioning boss includes a rotary boss and an adaptive adjustment device, the rotary boss is used to place the preform, and the adaptive adjustment device elastically conflicts with the preform.

[0014] Optionally, the injection mold is provided with at least two slots on the side of the cavity assembly, and the at least two slots are symmetrically arranged on the surface of the injection mold, and a shovel base for fixing the cavity assembly is provided in the slot.

[0015] Optionally, a fixing groove is provided on the top of the injection movable mold, and the shovel base is clamped and positioned in the fixing groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the overall structure of a reverse injection mold for a hybrid insulator provided by an embodiment of the present utility model;

[0017] Figure 2 A schematic diagram of a partial structure of a reverse injection mold for a hybrid insulator provided by an embodiment of the present utility model;

[0018] Figure 3 A schematic diagram of the overall structure of a reverse injection mold for a hybrid insulator provided by an embodiment of the present utility model;

[0019] Figure 4 This is a schematic structural diagram of a positioning device in an embodiment of the present utility model;

[0020] Figure 5 A top view of the first flow channel in an embodiment of the present utility model;

[0021] Figure 6 It is a top view of the second flow channel in the embodiment of the present utility model.

[0022] Description of reference numerals:

[0023] 1. Injection mold; 2. Cavity assembly; 3. Injection mold; 4. Preform; 5. Positioning boss; 51. Rotating boss; 52. Adaptive adjustment device; 6. Positioning device; 61. Base plate; 62. Elastic member; 63. Resistance member; 7. First runner; 8. Second runner; 9. First injection port; 10. Second injection port; 11. Left mold core; 12. Right mold core; 13. First shovel base; 14. Second shovel base. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The words "including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0025] See also Figures 1 to 6 An embodiment of the utility model provides a reverse injection mold for a hybrid insulator, which is stacked with an injection movable mold 1, a cavity assembly 2 and an injection fixed mold 3 from bottom to top, wherein the injection movable mold 1 is fixedly set on the lower mold base of the injection molding machine, and cooperates with the reverse right-angle injection system of the injection molding machine so that the reverse right-angle injection system can inject glue into the injection mold, and the injection fixed mold 3 is fixedly connected to the mold base of the injection molding machine.

[0026] In fact, when performing injection molding of hybrid insulators, the injection movable mold 1 is fixed to the lower mold base of the injection molding machine, the injection movable mold 1 is fixed to the upper mold base of the injection molding machine, and the preform 4 is placed in the cavity assembly 2 and the cavity assembly 2 is assembled between the injection movable mold 1 and the injection fixed mold 3. The injection molding machine injects rubber into the preform 4 in the cavity assembly 2 through the reverse right-angle injection system, so that the rubber is coated on the surface of the preform 4 under the action of gravity and solidified into shape.

[0027] Specifically, the cavity assembly 2 defines a cavity body, and the cavity assembly 2 is provided with a positioning boss 5 within the cavity body for placing the parison 4. The injection mold 3 is provided with a positioning device 6 located on top of the positioning boss 5 for pressing the parison 4. In practice, placing the parison 4 on the positioning boss 5 helps improve the positional stability of the parison 4 during molding, and the positioning device 6 can press the parison 4 against the positioning boss 5, further improving the positional stability.

[0028] In fact, the flat flange ring on the upper surface of the first umbrella of the preform 4 is the upper positioning surface, the positioning device 6 is in contact with the upper positioning surface of the preform 4, and the inner ring surface of the preform 4 is aligned with the positioning boss 5 in the cavity, thereby ensuring the upper and lower positioning and sealing stability.

[0029] In fact, when the hybrid insulator is injection molded, the fixed injection mold 3 and the upper mold base of the injection molding machine are kept in a fixed state synchronously, while the movable injection mold 1 moves up and down along with the lower mold base of the injection molding machine, thereby completing the opening and closing action of the mold, and cooperating with the reverse right-angle injection system of the injection molding machine to complete the rubber injection operation, so that high-yield injection overmolding of large-deviation, low-load brittle blanks 4 can be achieved.

[0030] In some embodiments, the positioning device 6 includes a base plate 61, an elastic member 62, and a resisting member 63. The two ends of the elastic member 62 are respectively connected to the base plate 61 and the resisting member 63, and the resisting member 63 elastically resists the preform 4. In practice, when the positioning device 6 resists and presses the preform 4, the elastic member 62 is compressed, causing the resisting member 63 to contact the upper surface of the first umbrella of the preform 4, thereby aligning the preform 4 in a centered and horizontal state.

[0031] In fact, the cavity assembly 2 includes a first cavity plate, a second cavity plate and a third cavity plate stacked in sequence from bottom to top, and the first cavity plate is provided with a first flow channel 7 interconnected with the cavity, and the third cavity plate is provided with a second flow channel 8 interconnected with the cavity; along the projection direction from bottom to top, the first flow channel 7 and the second flow channel 8 are staggered with each other.

[0032] Among them, the cavity plate is structurally an integral cavity plate, with a stepped circular hole in the center to cooperate with the positioning ring and rectangular grooves in the middle parts of both sides, which cooperate with the first shovel base 13 and the second shovel base 14 to clamp and position the mold core on the left and right, and functionally cooperate with the glass blank 4 to form the cavity body.

[0033] In fact, the first runner 7 and the second runner 8 are arranged in an arc along the projection direction from the bottom to the top of the mold, and a first injection port 9 and a second injection port 10 are opened on the injection movable mold 1, and the first injection port 9 is connected to the first runner 7, and the second injection port 10 is connected to the second runner 8.

[0034] The glass preform 4 is structurally composed of a three-umbrella rotating body structure and a column head, and is positioned by upper and lower clamping when the mold is closed; its umbrella shapes are the first to third umbrella shapes from top to bottom, and the first and second umbrella shapes are basically elliptical structures. The upper surface of the first umbrella shape has a small horizontal surface near the column head, which is used to cooperate with the positioning ring for upper positioning. The third umbrella shape is an inverted bowl-shaped structure, which cooperates with the positioning boss 5 to form the internal cavity of the mold; the bottom of the column head of the glass preform 4 has a small protrusion structure, which cooperates with the adaptive centering device on the positioning boss 5 for lower positioning.

[0035] The mold includes three horizontal parting surfaces and one vertical parting surface. The first horizontal parting surface is located at the matching surface of the cavity plate, the cavity plate and the cavity plate, and is provided with a runner and a gate for injection molding the first umbrella shape. An overflow groove and an exhaust system are also provided to ensure smooth molding and reduce molding errors. The second horizontal parting surface is located at the matching surface of the cavity plate, the cavity plate and the cavity plate, and is provided with a runner and a gate for injection molding the second umbrella shape. An overflow groove and an exhaust system are also provided to ensure smooth molding and reduce molding errors. ; The third horizontal parting surface is located at the matching surface of the cavity plate, the cavity plate and the movable mold base plate, and the positions of the runner, exhaust and gate thereon are the same as those of the second horizontal parting surface; the vertical parting surface is located at the matching surface of the left and right mold cores 12, and a cross runner is provided thereon to cooperate with the runner of the horizontal parting surface to form a complete runner system for injection molding, and an exhaust system is provided to exhaust the umbrella-shaped corner position where gas is easily collected, and an overflow groove is provided to ensure smooth molding. The reverse injection system consists of four nozzles and a heating plate that cooperates with them.

[0036] While the embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations may be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the claims. Furthermore, the present invention described herein may have other embodiments and may be implemented or carried out in a variety of ways.

Claims

1. A hybrid insulator reverse injection mold, characterized in that: An injection movable mold, a cavity assembly and an injection fixed mold are stacked in sequence from bottom to top, and the injection movable mold, the cavity assembly and the injection movable mold are surrounded in the cavity assembly to form a cavity body, the injection movable mold is located in the cavity body and is provided with a positioning boss for placing the preform, and the injection fixed mold is located in the cavity body and is provided with a positioning device, and the positioning boss is arranged corresponding to the positioning device; a plurality of flow channels connected to the cavity body are provided in the cavity assembly, and a glue injection port connected to the flow channels is provided on the injection movable mold.

2. The hybrid insulator reverse injection mold according to claim 1, characterized in that: The flow channel in the cavity assembly is divided into a first flow channel and a second flow channel, and the connection between the first flow channel and the cavity body is closer to the injection mold than the second flow channel; along the projection direction from the bottom to the top, the first flow channel and the second flow channel are staggered with each other.

3. The hybrid insulator reverse injection mold according to claim 2, characterized in that: Along the projection direction from the bottom to the top, the first flow channel and the second flow channel are both arranged in an arc shape.

4. The hybrid insulator reverse injection mold according to claim 3, characterized in that: The glue injection port includes a first glue injection port and a second glue injection port that are independent of each other, and the first glue injection port and the second glue injection port are both vertically opened on the injection dynamic mold, the first glue injection port is interconnected with the first flow channel, and the second glue injection port is interconnected with the second flow channel.

5. The hybrid insulator reverse injection mold according to claim 1, characterized in that: The cavity assembly includes a left mold core and a right mold core that are assembled with each other, and the cavity body is formed at the joint between the left mold core and the right mold core; multiple flow channels are symmetrically arranged on the left mold core and the right mold core, and the end points of the flow channels are located at the joint between the left mold core and the right mold core.

6. The hybrid insulator reverse injection mold according to claim 1, characterized in that: The positioning device includes a base plate, an elastic member and a resisting member. Two ends of the elastic member are respectively connected to the base plate and the resisting member, and the resisting member elastically resists the parison.

7. The hybrid insulator reverse injection mold according to claim 1, characterized in that: The positioning boss includes a rotary boss and an adaptive adjustment device. The rotary boss is used to place the preform, and the adaptive adjustment device elastically conflicts with the preform.

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