Injection molding positioning mold for stator plastic coating
By designing an injection molding positioning mold with a cylinder and cooling water pipe, the problem of difficulty in keeping the gap between the stator core and the inner wall of the cavity is solved, high-quality plastic wrap is achieved, and the plastic wrap efficiency is improved through rapid cooling and forming.
Patent Information
- Application Number
- CN202420560931.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-03-21
AI Technical Summary
When existing injection molds wrap the stator core of the motor, it is difficult to keep the gap between the stator core and the inner wall of the cavity consistent, resulting in inconsistent injection surface layer, affecting the quality of plastic wrap, and at the same time, the cooling and forming time is long and the efficiency is low.
An injection molding positioning mold including a lower mold seat and an upper mold seat is designed. The pressing strip is pressed on the inner wall of the stator through the elongation of the cylinder to achieve the fixing of the stator, and connected to the external cooling water circulation system through a cooling water pipe, so as to achieve rapid cooling and forming of epoxy resin or thermoplastic plastic.
It effectively prevents the impact of epoxy resin or thermoplastic on the stator core, improves the plastic wrap quality, and reduces cooling time through rapid cooling and molding, and improves the plastic wrap efficiency.
Smart Images
Figure CN222610268U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an injection molding positioning mold, in particular to an injection molding positioning mold for stator overmolding. Background Art
[0002] The motor stator is an important part of motors such as generators and starters. The stator is an important part of the motor. The stator consists of three parts: the stator core, the stator winding and the frame. The main function of the stator is to generate a rotating magnetic field. The stator core of the axial magnetic field motor is in the shape of a hollow ring, and a certain number of slots are opened along one side of the circumference. The energized copper wire is placed in the slot to provide power input. During the operation of the motor, since the copper wire is energized and the stator core itself is conductive, it is necessary to insulate the surface where the stator core contacts the copper wire. Since the energized copper wire and the core will generate heat during the operation of the motor, the insulation layer of the stator core must not only meet the insulation requirements, but also have good heat resistance, thermal conductivity and mechanical properties.
[0003] At present, a common practice is to inject an insulating layer on the surface of the motor stator core. However, when the existing injection mold is overmolding the motor stator core, the stator core is usually placed in the cavity and aligned. However, the added epoxy resin or thermoplastic plastic will have a certain impact on the stator core, making it difficult to keep the gap between the stator core and the inner wall of the cavity consistent, resulting in inconsistent injection surface layer, affecting the overmolding quality of the stator; and the existing injection mold realizes the cooling molding of the overmolding by natural cooling, which takes a long time and has low efficiency. Summary of the invention
[0004] The technical problem to be solved by the utility model is that the gap between the stator core and the inner wall of the cavity is difficult to keep consistent, resulting in inconsistent injection surface layer, affecting the quality of stator overmolding; the existing injection molds provide an injection positioning mold for stator overmolding by realizing the problems of long cooling molding time and low efficiency of overmolding.
[0005] In order to solve the above problems, the technical solution of the utility model is: an injection positioning mold for stator overmolding, comprising a lower mold base and an upper mold base, the top surface of the lower mold base is provided with a mold cavity, the upper mold base is provided with an injection hole and an exhaust hole, a positioning column is fixedly connected to the bottom surface of the mold cavity, a bearing plate is movably sleeved on the outer side of the positioning column, a plurality of mounting grooves are provided in the middle of the positioning column, a cylinder 2 is installed in the mounting groove, and a pressure strip is installed at the output end of the cylinder 2; a cavity with an annular structure is provided inside the lower mold base on the outer side of the mold cavity, a cooling water pipe is installed inside the cavity, and the cooling water pipe is connected to an external cooling water circulation system.
[0006] Furthermore, a lower sealing ring is fixedly connected to the top surface of the bearing plate, and a plurality of cylinders are installed at the bottom.
[0007] Furthermore, the lower sealing ring is sleeved on the outside of the positioning column, and a plurality of columns adapted to the stator coil slots are fixedly connected to the top surface of the bearing plate.
[0008] Furthermore, the outer edge of the bearing plate abuts against the inner wall of the cavity, and a sealing ring is provided between the bearing plate and the inner wall of the cavity.
[0009] Furthermore, a fixing groove adapted to the cavity is formed on the bottom surface of the upper die seat, and an upper sealing ring is installed inside the fixing groove.
[0010] Furthermore, the four corners of the top surface of the lower die base are fixedly connected with limiting protrusions, and the bottom surface of the upper die base is provided with limiting grooves matched with the limiting protrusions.
[0011] Furthermore, the cooling water pipe is a copper pipe and is wound around the outside of the cavity, and both ends of the cooling water pipe extend to the outside of the lower mold base.
[0012] Furthermore, a solenoid valve is installed at the water inlet end of the cooling water pipe.
[0013] The utility model is beneficial compared with the existing technology in that:
[0014] 1. The utility model uses the extension of the second cylinder to press the pressure strip against the inner wall of the stator, thereby fixing the stator, effectively preventing the added epoxy resin or thermoplastic plastic from impacting the stator core, and improving the plastic coating quality of the stator.
[0015] 2. The utility model connects the cooling water pipe to the external cooling water circulation system, and the circulating cooling water can realize the rapid cooling and molding of epoxy resin or thermoplastic plastic, thereby reducing the cooling time and improving the efficiency of stator plastic coating. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional diagram of the injection molding positioning mold for stator overmolding of the utility model;
[0017] Figure 2 This is a cross-sectional view of an injection molding positioning mold for stator overmolding of the utility model;
[0018] Figure 3 This is the internal structure diagram of the lower die base of the utility model;
[0019] Figure 4 This is a structural diagram of the upper die base of the utility model;
[0020] In the figure: 1. lower die base; 2. upper die base; 3. positioning column; 4. bearing plate; 5. lower sealing ring; 6. cylinder one; 7. cylinder two; 8. pressure strip; 9. cooling water pipe; 10. upper sealing ring; 11. limiting protrusion; 12. column. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0022] like Figure 1 and Figure 2 As shown, an injection molding positioning mold for stator overmolding provided by an embodiment of the utility model comprises a lower mold base 1 and an upper mold base 2, the lower mold base 1 has a cavity on its top surface, the upper mold base 2 has injection holes and exhaust holes, limiting protrusions 11 are fixedly connected at the four corners of the top surface of the lower mold base 1, and the upper mold base 2 has a limiting groove adapted to the limiting protrusion 11 on its bottom surface.
[0023] A positioning column 3 is fixedly connected to the bottom surface of the cavity, and a carrying plate 4 is movably sleeved on the outside of the positioning column 3. The outer edge of the carrying plate 4 abuts against the inner wall of the cavity, and a sealing ring is provided between the carrying plate 4 and the inner wall of the cavity. A lower sealing ring 5 is fixedly connected to the top surface of the carrying plate 4, and a plurality of cylinders 1 6 are installed at the bottom. The lower sealing ring 5 is sleeved on the outside of the positioning column 3, and a plurality of columns 12 adapted to the stator coil slots are also fixedly connected to the top surface of the carrying plate 4. A plurality of mounting grooves are opened in the middle of the positioning column 3, and a cylinder 2 7 is installed in the mounting groove, and a pressure strip 8 is installed at the output end of the cylinder 2 7.
[0024] The extension of the cylinder 1 6 causes the bearing plate 4 to drive the lower sealing ring 5 to rise, and the distance of the rise is the thickness of the stator required for plastic coating. The stator is sleeved on the outside of the positioning column 3, and the placement of the stator is adjusted so that the center line of the stator coincides with the center line of the positioning column 3, and the column 12 is located at the center of the stator coil slot. At this time, the cylinder 2 7 is extended, causing the pressure strip 8 to be pressed against the inner wall of the stator to fix the stator. The cylinder 1 6 shrinks and returns to its original position. At this time, the distance between the bottom surface of the stator and the bearing plate 4 is the thickness of the stator required for plastic coating.
[0025] like Figure 4 As shown, a fixing groove matching the cavity is formed on the bottom surface of the upper die seat 2, and an upper sealing ring 10 is installed inside the fixing groove.
[0026] The depth of the fixed groove is the thickness of the plastic coating. The upper mold base 2 is covered. At this time, the top surface of the column 12 abuts against the top surface of the fixed groove, and the upper sealing ring 9 is inserted into the inner side of the stator. The setting of the upper sealing ring 9 can prevent epoxy resin or thermoplastic plastic from entering the inner side of the stator from the upper part of the stator.
[0027] like Figure 2 and Figure 3As shown, a ring-shaped cavity is provided inside the lower die base 1 outside the cavity, and a cooling water pipe 9 is installed inside the cavity. The cooling water pipe 9 is a copper pipe and is wound around the outside of the cavity. Both ends of the cooling water pipe 9 extend to the outside of the lower die base 1.
[0028] The cooling water pipe 9 is connected to the external cooling water circulation system, and a solenoid valve is installed at the water inlet end of the cooling water pipe 9. When the overmolding is completed, the solenoid valve is opened. The circulating cooling water can achieve rapid cooling and molding of the epoxy resin or thermoplastic plastic, thereby reducing the cooling time and improving the efficiency of the stator overmolding.
[0029] In specific use, the pressure strip 8 is pressed against the inner wall of the stator by the extension of the cylinder 2 7, thereby fixing the stator and effectively preventing the added epoxy resin or thermoplastic plastic from impacting the stator core, so that the gap between the stator core and the inner wall of the cavity is consistent, thereby improving the quality of the stator coating. The cooling water pipe 9 is connected to the external cooling water circulation system, and the circulating cooling water can realize the rapid cooling and molding of the epoxy resin or thermoplastic plastic, reducing the cooling time and improving the efficiency of the stator coating.
[0030] The undisclosed parts in the present invention are all prior art, and their specific structures and working principles are not described in detail.
[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
[0032] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.
Claims
1. An injection molding positioning mold for stator overmolding, comprising a lower mold base (1) and an upper mold base (2), wherein the top surface of the lower mold base (1) is provided with a mold cavity, and the upper mold base (2) is provided with an injection hole and an exhaust hole, characterized in that: A positioning column (3) is fixedly connected to the bottom surface of the cavity, a bearing plate (4) is movably sleeved on the outer side of the positioning column (3), a plurality of mounting grooves are opened in the middle of the positioning column (3), a cylinder 2 (7) is installed in the mounting groove, and a pressure strip (8) is installed at the output end of the cylinder 2 (7); a cavity with an annular structure is provided inside the lower mold base (1) on the outer side of the cavity, a cooling water pipe (9) is installed inside the cavity, and the cooling water pipe (9) is connected to an external cooling water circulation system.
2. The injection molding positioning mold for stator overmolding according to claim 1, characterized in that: A lower sealing ring (5) is fixedly connected to the top surface of the bearing plate (4), and a plurality of cylinders (6) are installed at the bottom.
3. The injection molding positioning mold for stator overmolding according to claim 2, characterized in that: The lower sealing ring (5) is sleeved on the outside of the positioning column (3), and a plurality of columns (12) adapted to the stator coil slots are fixedly connected to the top surface of the bearing plate (4).
4. The injection molding positioning mold for stator overmolding according to claim 1, characterized in that: The outer edge of the bearing plate (4) abuts against the inner wall of the cavity, and a sealing ring is provided between the bearing plate (4) and the inner wall of the cavity.
5. The injection molding positioning mold for stator overmolding according to claim 1, characterized in that: The bottom surface of the upper die seat (2) is provided with a fixing groove matched with the die cavity, and an upper sealing ring (10) is installed inside the fixing groove.
6. The injection molding positioning mold for stator overmolding according to claim 1, characterized in that: The four corners of the top surface of the lower die seat (1) are fixedly connected to limiting protrusions (11), and the bottom surface of the upper die seat (2) is provided with limiting grooves matched with the limiting protrusions (11).
7. The injection molding positioning mold for stator overmolding according to claim 1, characterized in that: The cooling water pipe (9) is a copper pipe and is wound around the outside of the cavity. Both ends of the cooling water pipe (9) extend to the outside of the lower die base (1).
8. The injection molding positioning mold for stator overmolding according to claim 1, characterized in that: A solenoid valve is installed at the water inlet end of the cooling water pipe (9).