A type of injection-molded circuit breaker connecting piece designed to prevent detachment.

Abstract

This utility model relates to the field of electrical component connection structure technology, specifically a circuit breaker connection piece injection molded part to prevent detachment. It includes an insulating outer shell and a metal connection piece. The metal connection piece has a U-shaped bending anchoring section in its middle, which extends laterally through the width of the metal connection piece and is embedded in the insulating outer shell. The insulating outer shell forms an annular covering area around the U-shaped bending anchoring section at a corresponding position. Reinforcing ribs are provided around the outer periphery of the annular covering area, and the inner cavity of the open side of the U-shaped bending anchoring section is filled with a plastic tenon, forming a multi-level mechanical interlocking structure. This circuit breaker connection piece injection molded part significantly improves the bonding strength between the metal connection piece and the plastic substrate, effectively preventing loosening and detachment due to vibration or pulling during use, thus improving connection reliability and safety.

Description

Technical Field

[0001] This utility model relates to the field of electrical component connection structure technology, specifically to a circuit breaker connection piece injection molded to prevent detachment. Background Technology

[0002] Circuit breakers, as crucial protective components in power systems, are widely used in various power distribution equipment. Their connecting plates are used to achieve electrical connections between multiple circuit breakers, ensuring stable current transmission. With the trend towards miniaturization and integration of electrical equipment, higher demands are placed on the installation reliability, structural stability, and assembly efficiency of the connecting plates. Currently, most connecting plates utilize injection molding, embedding metal conductive sheets into a plastic matrix to achieve the dual functions of insulation protection and structural support.

[0003] In practical use, the injection-molded circuit breaker connecting pieces in existing technologies often become loose or even fall off due to unreasonable structural design. This is especially true because the bonding strength between the metal conductive sheet and the plastic coating layer is insufficient, relying mainly on simple interference fits or local snap-fit ​​fixation, lacking an effective mechanical interlocking structure. This leads to fretting wear at the interface, which reduces the reliability of the electrical connection and may even cause poor contact and local overheating in severe cases, posing safety hazards. Utility Model Content

[0004] The purpose of this utility model is to provide a circuit breaker connecting piece injection molded part that prevents detachment, so as to solve the problems mentioned in the background art that the metal connecting piece of the current circuit breaker connecting piece injection molded part has insufficient bonding strength between the metal connecting piece and the plastic matrix, and is prone to loosening and detachment under vibration or external force, resulting in unreliable electrical connection and safety hazards.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a circuit breaker connecting piece injection molded part for preventing detachment, comprising an insulating outer shell and a metal connecting piece, wherein the metal connecting piece has a U-shaped bending anchoring section in the middle, the U-shaped bending anchoring section extends laterally through the width direction of the metal connecting piece and is embedded in the insulating outer shell, the insulating outer shell forms an annular covering area covering the U-shaped bending anchoring section at a corresponding position, the annular covering area is provided with a reinforcing rib group on the outer periphery, and the inner cavity of the opening side of the U-shaped bending anchoring section is filled with a plastic tenon, forming a multi-level mechanical interlocking structure.

[0006] Preferably, the arc transition radius of the U-shaped bending anchoring section is 1.5-2.0mm, and its two ends are smoothly connected to the metal connecting piece body to form an integral structure formed by stamping.

[0007] Preferably, the wall thickness of the annular covering area is 1.8-2.5 mm, completely covering the outer periphery and end of the U-shaped bending anchoring section, and the inner wall of the annular covering area forms a micro-interlocking surface with the surface of the U-shaped bending anchoring section.

[0008] Preferably, the reinforcing rib group consists of four longitudinal reinforcing ribs evenly distributed along the outer periphery of the annular covering area, each reinforcing rib having a height of 2.0-3.0 mm and a rounded corner at the root.

[0009] Preferably, the plastic tenon is a columnar structure formed by the solidification of molten plastic after it flows into the inner cavity of the U-shaped bending anchoring section during injection molding, and the cross-section of the plastic tenon is trapezoidal.

[0010] Preferably, the metal connecting piece has positioning bosses on both sides of the U-shaped bending anchoring section, and the positioning bosses are embedded in the corresponding positioning grooves on the inner wall of the insulating outer shell.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows: This anti-detachment circuit breaker connecting piece injection molding significantly improves the bonding strength between the metal connecting piece and the plastic substrate, effectively preventing loosening and detachment caused by vibration or pulling during use, and improving connection reliability and safety. This injection molding piece achieves double mechanical interlocking by setting a transverse U-shaped bending anchoring section on the metal connecting piece, combined with the annular covering area formed by the insulating outer shell and the internal plastic tenon. Simultaneously, the reinforcing ribs on the outer periphery of the annular covering area enhance the local structural rigidity, further suppressing shell deformation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the injection-molded part of a circuit breaker connecting piece to prevent detachment according to the present invention;

[0013] Figure 2 This is a side view of the connection structure between the metal connecting piece and the insulating housing of a circuit breaker connecting piece injection molded to prevent detachment, according to this utility model.

[0014] Figure 3 This is a schematic diagram of the external structure of a circuit breaker connecting piece injection molded to prevent detachment, according to the present invention.

[0015] In the diagram: 1. Insulating outer shell; 11. Annular covering area; 12. Reinforcing rib group; 13. Plastic tenon; 14. Positioning groove; 2. Metal connecting piece; 21. U-shaped bending anchoring section; 22. Positioning boss. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1-3This utility model provides a technical solution: a circuit breaker connecting piece injection molded to prevent detachment, comprising an insulating outer shell 1 and a metal connecting piece 2. The metal connecting piece 2 has a U-shaped bent anchoring section 21 in its middle, which extends laterally through the width of the metal connecting piece 2 and is embedded within the insulating outer shell 1. The insulating outer shell 1 forms an annular covering area 11 at a corresponding position, enclosing the U-shaped bent anchoring section 21. Reinforcing ribs 12 are provided around the outer periphery of the annular covering area 11, and the inner cavity of the open side of the U-shaped bent anchoring section 21 is filled with plastic tenons 13, forming a multi-level mechanical interlocking structure. This structure prevents the metal connecting piece from detaching when subjected to external force or vibrations caused by long-term equipment operation. The U-shaped bent anchoring section 21 on piece 2 forms a mechanical basis for pull-out resistance through its transverse through-structure. The annular covering area 11 formed by the insulating outer shell 1 tightly wraps the outer periphery and end of the U-shaped bent anchoring section 21, effectively restricting its axial and radial displacement. At the same time, the micro-interlocking surface formed between the inside of the annular covering area 11 and the surface of the U-shaped bent anchoring section 21 enhances the frictional resistance between the interfaces, further suppressing relative sliding. The plastic tenon 13 located in the inner cavity on the opening side of the U-shaped bent anchoring section 21 is integrally solidified with the molten plastic during injection molding. Its trapezoidal cross-section structure produces a reverse interlocking effect after cooling, firmly embedding itself inside the U-shaped bent anchoring section 21, forming an irreversible internal anchoring. Points prevent metal parts from detaching outwards. Furthermore, the reinforcing ribs 12 around the annular covering area 11 enhance the local shell rigidity, preventing deformation of the insulating shell 1 under stress that could lead to loosening of the covering structure. The coordinated action of these components forms a multi-level mechanical interlocking system from the inside out and from the local to the overall structure, significantly improving the bonding strength between the metal connecting piece 2 and the insulating shell 1. This effectively solves the safety hazards in existing technologies caused by relying solely on interference fits or simple snap-fits, such as easy loosening and detachment of connecting pieces, interface fretting wear, poor contact, and localized overheating. It greatly improves the long-term stability and electrical safety of the circuit breaker connection. The arc transition radius of the U-shaped bending anchoring section 21... The thickness is 1.5-2.0mm, and both ends are smoothly connected to the main body of the metal connecting piece 2, forming an integral stamped structure. The arc transition radius of the U-shaped bent anchoring section 21 effectively disperses stress concentration and avoids cracks during vibration or assembly stress. The integral stamped structure that is smoothly connected to the main body of the metal connecting piece 2 ensures the overall strength and deformation consistency of the metal parts, so that the anchoring section maintains structural integrity during long-term service. This allows it to continuously and stably cooperate with the annular covering area 11 and the internal plastic tenon 13 of the insulating shell 1 to form a reliable mechanical interlock, preventing loosening of the connection due to fatigue fracture or deformation of the metal parts. The wall thickness of the annular covering area 11 is 1.8-2mm.The 5mm thick annular covering 11 completely encloses the outer periphery and ends of the U-shaped bent anchoring section 21, and the inner wall of the annular covering 11 forms a microscopic interlocking surface with the surface of the U-shaped bent anchoring section 21. This structure ensures sufficient structural strength and toughness through the appropriate wall thickness, making it less prone to cracking or deformation under vibration or external force. Its complete enclosedness of the outer periphery and ends of the U-shaped bent anchoring section 21 provides comprehensive physical constraint, effectively suppressing the axial and radial movement of the metal connecting piece 2. Simultaneously, the microscopic interlocking surface formed between the inner wall of the annular covering 11 and the surface of the U-shaped bent anchoring section 21 significantly increases the contact area and frictional resistance between the two interfaces, suppressing fretting wear and interface peeling during long-term operation, and ensuring the proper bonding between the plastic matrix and the metal... The anchoring section maintains a tight connection at all times. The reinforcing rib group 12 consists of four longitudinal reinforcing ribs evenly distributed along the outer periphery of the annular covering area 11. Each reinforcing rib is 2.0-3.0 mm high and has a rounded corner at the root. This structure effectively improves the structural rigidity and deformation resistance of the insulating shell 1 in the anchoring area. When the connecting piece is subjected to external impact or assembly stress, this structure can evenly distribute the local load, preventing the annular covering area 11 from warping or cracking due to stress concentration. The rounded corner at the root further reduces the risk of stress concentration, prevents cracks from propagating from the root, and ensures that the reinforcing ribs can still function stably under long-term vibration, thereby maintaining the annular covering area 11. The tight constraint on the U-shaped bend anchoring section 21 ensures the integrity and durability of the entire mechanical interlocking structure. The plastic tenon 13 is a columnar structure formed by the solidification of molten plastic after it flows into the opening cavity of the U-shaped bend anchoring section 21 during injection molding. The cross-section of the plastic tenon 13 is trapezoidal. This structure integrates the plastic tenon 13 with the surrounding plastic matrix. After cooling and shrinking, its trapezoidal cross-section structure forms a reverse snap-fit ​​effect in the inner cavity, thereby achieving irreversible mechanical locking inside the metal connecting piece 2. This effectively resists axial pull-out force, significantly improves the interface's shear resistance and pull-out resistance, and maintains stable anchoring under long-term vibration or thermal cycling conditions, preventing the metal connecting piece 2 from loosening relative to the insulating outer shell 1. Alternatively, the metal connecting piece 2 may detach. Positioning bosses 22 are provided on both sides of the U-shaped bending anchoring section 21. These positioning bosses 22 are embedded in corresponding positioning grooves 14 on the inner wall of the insulating outer shell 1. This structure ensures precise positioning of the metal connecting piece 2 during injection molding, preventing displacement or rotation. It also guarantees a tight fit between the U-shaped bending anchoring section 21 and the annular covering area 11, and effective forming of the internal plastic tenon 13. The engagement of the positioning bosses 22 and the positioning grooves 14 not only enhances assembly accuracy but also provides additional circumferential restraint during subsequent use, further suppressing minor displacements of the metal connecting piece 2 caused by vibration or external forces.

[0018] Working principle: When using this anti-detachment circuit breaker connecting piece injection molding part, firstly, the metal connecting piece 2 is placed into the insert position of the injection mold. The positioning bosses 22 on both sides of the metal connecting piece 2 are inserted into the corresponding positioning holes in the mold for spatial positioning. Then, the injection molding process is started, and high-temperature molten plastic is injected into the mold cavity. The plastic material wraps around the middle area of ​​the metal connecting piece 2, forming the main structure of the insulating outer shell 1 outside the U-shaped bending anchoring section 21. An annular covering area 11 is formed around this area. At the same time, the molten plastic anchors from the U-shaped bend. The plastic flows into the inner cavity of the opening side of segment 21, fills and solidifies to form a plastic tenon 13. On the outer periphery of the annular covering area 11, the plastic simultaneously fills the reinforcing rib cavity in the mold to form a reinforcing rib group 12 composed of four longitudinal ribs. After injection molding, the plastic is cooled and demolded. During the shrinkage process, the plastic forms a micro-interlocking structure between the inner wall of the annular covering area 11 and the surface of the U-shaped bent anchoring segment 21. After demolding, the positioning boss 22 on the metal connecting piece 2 is located in the positioning groove 14 reserved in the inner wall of the insulating outer shell 1, thereby completing a series of operations.

[0019] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A circuit breaker connecting piece injection molded to prevent detachment, comprising an insulating housing (1) and a metal connecting piece (2), characterized in that: The metal connecting piece (2) has a U-shaped bending anchor section (21) in the middle. The U-shaped bending anchor section (21) extends laterally through the width of the metal connecting piece (2) and is embedded in the insulating shell (1). The insulating shell (1) forms an annular covering area (11) covering the U-shaped bending anchor section (21) at the corresponding position. The annular covering area (11) is provided with a reinforcing rib group (12) on the outer periphery. The inner cavity of the opening side of the U-shaped bending anchor section (21) is filled with a plastic tenon (13), forming a multi-level mechanical interlocking structure.

2. The anti-detachment injection molded circuit breaker connecting piece according to claim 1, characterized in that: The arc transition radius of the U-shaped bending anchor section (21) is 1.5-2.0mm, and its two ends are smoothly connected to the main body of the metal connecting piece (2) to form an integral structure formed by stamping.

3. The anti-detachment injection molded circuit breaker connecting piece according to claim 1, characterized in that: The wall thickness of the annular covering area (11) is 1.8-2.5 mm, which completely covers the outer periphery and end of the U-shaped bent anchoring section (21), and the inner wall of the annular covering area (11) and the surface of the U-shaped bent anchoring section (21) form a micro-interlocking surface.

4. The anti-detachment injection molded circuit breaker connecting piece according to claim 1, characterized in that: The reinforcing rib group (12) consists of four longitudinal reinforcing ribs evenly distributed along the outer periphery of the annular covering area (11). Each reinforcing rib has a height of 2.0-3.0 mm and a rounded corner at the root.

5. The anti-detachment injection molded circuit breaker connecting piece according to claim 1, characterized in that: The plastic tenon (13) is a columnar structure formed by the solidification of molten plastic after it flows into the inner cavity of the U-shaped bending anchor section (21) during injection molding. The cross-section of the plastic tenon (13) is trapezoidal.

6. The anti-detachment injection molded circuit breaker connecting piece according to claim 1, characterized in that: The metal connecting piece (2) has positioning bosses (22) on both sides of the U-shaped bending anchor section (21), and the positioning bosses (22) are embedded in the corresponding positioning grooves (14) on the inner wall of the insulating outer shell (1).

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