3p plug wiring harness structure

Abstract

The utility model discloses a kind of 3P plug wire harness structures, it includes footrest, PIN foot, insert shell, handle shell, screw cap, conical cylinder claw, cable and annular terminal, the structure design of the utility model is reasonable, adopt split type structure design, insert shell, handle shell and screw cap can be disassembled, when connecting, the wire core of cable can be inserted into the axial insertion hole of PIN foot, and use locking screw to compress, realize the electrical connection and fixed of wire core and PIN foot. Then, screw cap extrusion conical cylinder claw closes, to compress cable, complete the mechanical fixation of cable, can effectively resist external force pulling and the mechanical stress caused by frequent plugging and unplugging, reduce the risk of connection fracture, improve the service life and reliability of plug. Moreover, when the connection of cable is damaged, it can be used repeatedly by stripping connection, prolong the service life, which is beneficial to resource conservation and cost control. In addition, annular terminal is provided at the other end of the cable, which facilitates connection with other electrical components.

Description

Technical Field

[0001] This utility model relates to the field of plug technology, specifically to a 3P plug harness structure. Background Technology

[0002] A 3P plug is a common type of electrical connector. "3P" is an abbreviation for "3Pin," indicating that the plug has three prongs. It is primarily used for electrical connections between devices and power sources or other devices, and is widely used in industrial, commercial, and residential applications.

[0003] Most existing 3P plugs use a one-piece injection-molded structure. In this structure, the connection between the cable and the plug relies mainly on the encapsulation effect of the material during injection molding for fixation. However, in actual use, the cable is often subjected to external pulling forces or frequent bending from plugging and unplugging, which can easily lead to cracks or even complete detachment at the connection between the cable and the plug, ultimately causing an electrical connection interruption and affecting normal use. Moreover, once damaged, it is usually difficult to repair and must be replaced entirely, which is not conducive to resource conservation and cost control. Utility Model Content

[0004] To address the aforementioned shortcomings, the purpose of this utility model is to provide a 3P plug harness structure with a reasonable structural design and a long service life.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A 3P plug harness structure includes a base and three pins embedded in the base, a housing, a handle housing, a screw cap, a conical claw, a cable, and an annular terminal. The base is fixedly mounted on the housing. The tail end face of the pin has an axial insertion hole, and the circumferential surface of the tail end has a radial screw hole communicating with the axial insertion hole. The front end of the handle housing is opposite to the tail end of the housing. The conical claw is located at the tail end of the handle housing. The screw cap has a through hole through which the cable passes. The cable passes through the through hole and the conical claw and extends into the handle housing, with the core of the cable inserted into the axial insertion hole. A locking screw is screwed into the radial screw hole to press the core tightly. The screw cap is screwed onto the tail end of the housing and squeezes the conical claw to close and press the cable. The annular terminal is located on the other end of the cable core.

[0007] In a preferred embodiment of this invention, the foot has several recessed grooves distributed around its back edge, and the insert housing has an assembly step adapted to the foot. The assembly step has recessed protrusions adapted to the recessed grooves. This allows the foot to be fixed to the insert housing through the engagement of the recessed grooves and protrusions, enhancing the connection strength and stability between the foot and the insert housing.

[0008] In a preferred embodiment of this invention, the back of the base is provided with a protective sleeve corresponding to the position of the PIN pin to cover the tail of the PIN pin. The protective sleeve has notches that expose the axial insertion hole and the radial screw hole. The protective sleeve covers the tail of the PIN pin, protecting the tail of the PIN pin without affecting the insertion of the wire core and the tightening of the locking screw, while also facilitating subsequent assembly and electrical connection.

[0009] In a preferred embodiment of this utility model, the tail end opening face of the insert shell is provided with three annular edges, a middle annular edge and an outer annular edge, with progressively increasing diameters, concentrically. The outer wall of the inner annular edge is provided with a front external thread. The front end opening face of the handle shell is provided with two front inner rings and a front outer ring, with progressively increasing diameters, concentrically. The front inner ring is inserted between the middle annular edge and the outer annular edge, and its inner surface is provided with a front inner thread adapted to the front external thread. The front outer ring abuts against the outer annular edge. This provides a good fit, and the threaded connection makes the connection between the insert shell and the handle shell more secure and reliable, facilitating disassembly and assembly, and improving production efficiency and maintenance convenience.

[0010] As a preferred embodiment of this utility model, the contact surface between the front outer ring and the outer annular edge is an inclined surface. When the handle shell and the insert shell are tightened, the interaction between the inclined surfaces will generate greater friction and clamping force, thereby enhancing the sealing between the handle shell and the insert shell.

[0011] In a preferred embodiment of this invention, a cover is provided on the inner annular side to close its opening, and the cover has a window corresponding to the notch. The cover can prevent internal electrical connection parts from being contaminated or damaged, while the design of the window does not affect the insertion of the cable core into the axial socket or the tightening of the locking screw.

[0012] In a preferred embodiment of this invention, the outer circumferential surface of the handle housing is provided with a rear external thread that matches the screw cap. The screw cap can be tightened onto the tail end of the handle housing through the engagement with the rear external thread, thereby squeezing and closing the conical claws to press and tighten the cable, achieving a secure fixation of the cable. Furthermore, the tightness of the screw cap can be adjusted according to actual needs to accommodate cables of different diameters or materials, improving the plug's versatility and practicality.

[0013] In a preferred embodiment of this invention, a sheath is fitted onto the cable corresponding to the position of the conical claw, and a slot is provided on the tail end face of the handle for inserting the front end of the sheath, resulting in good assembly stability. The sheath protects the cable from damage at the position of the conical claw, extending the cable's service life.

[0014] The beneficial effects of this utility model are as follows: The structure of this utility model is reasonable, adopting a split-type design. The insert shell, handle shell, and screw cap can be disassembled. During connection, the cable core can be inserted into the axial insertion hole of the PIN, and the locking screw is screwed into the radial screw hole to press the core, achieving electrical connection and fixation between the core and the PIN. Next, screwing the screw cap compresses the conical claws, thereby pressing the cable and completing the mechanical fixation of the cable. This enhances the stability of the connection between the cable and the plug, effectively resisting mechanical stress caused by external pulling and frequent plugging and unplugging, reducing the risk of breakage at the connection point, and improving the service life and reliability of the plug. Furthermore, when the cable connection is damaged, the screw cap and handle shell can be disassembled, the damaged part of the cable can be cut off, and the intact end of the cable can be stripped and reconnected, allowing for reuse, extending service life, and contributing to resource conservation and cost control. Additionally, a ring terminal is provided at the other end of the cable for convenient connection with other electrical components.

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Fig. 1 This is a schematic diagram of the main structure of this utility model.

[0017] Fig. 2 This is a cross-sectional structural diagram of the present invention.

[0018] Fig. 3 This is a schematic diagram of the structure of the foot and the insert shell in this utility model.

[0019] Fig. 4 This is a schematic diagram of the structure of the handle shell and the rotating cap in this utility model. Detailed Implementation

[0020] Example: See Figs. 1 to 4 This embodiment provides a 3P plug harness structure, which includes a base 1, a pin 2, a plug shell 3, a handle shell 4, a screw cap 5, a conical claw 6, a cable 7, and a ring terminal 8.

[0021] The foot bracket 1 is fixedly mounted on the socket 3. Specifically, the foot bracket 1 has several recessed grooves 11 distributed around its back edge. The socket 3 has an assembly step 31 that matches the foot bracket 1, and the assembly step 31 has recessed protrusions that match the recessed grooves 11. This allows the foot bracket 1 to be fixed to the socket 3 through the engagement of the recessed grooves 11 and the recessed protrusions, enhancing the connection strength and stability between the foot bracket 1 and the socket 3, preventing the foot bracket 1 from loosening or detaching within the socket 3, ensuring the fixation of the PIN 2 on the foot bracket 1, thereby guaranteeing the reliability of the electrical connection and helping to improve the overall quality and performance of the plug, enabling it to maintain good working condition during long-term use.

[0022] The tails of the three PIN pins 2 are embedded in the base 1. Each PIN pin 2 has an axial insertion hole 21 on its tail end face and a radial screw hole 22 communicating with the axial insertion hole 21 on its circumferential surface. Preferably, a protective sleeve is provided on the back of the base 1 corresponding to the position of the PIN pin 2 to cover the tail of the PIN pin 2. The protective sleeve has a notch that exposes the axial insertion hole 21 and the radial screw hole 22. The protective sleeve covers the tail of the PIN pin, protecting it without affecting the insertion of the wire core and the tightening of the locking screw 23, while also facilitating subsequent assembly and electrical connection.

[0023] The front end of the handle shell 4 is connected to the rear end of the insert shell 3. Specifically, the open end face of the rear end of the insert shell 3 is provided with three inner annular edges 32, middle annular edges 33 and outer annular edges 34 with progressively increasing diameters.

[0024] The outer wall of the inner annular edge 32 is provided with a front external thread. Preferably, a cover 9 is provided on the inner annular edge 32 to close its opening. The cover 9 has a window corresponding to the notch. The cover 9 can prevent the internal electrical connection parts from being contaminated or damaged, while the design of the window does not affect the insertion of the cable core 7 into the axial insertion hole 21 and the screwing in of the locking screw 23.

[0025] The front opening face of the handle shell 4 is provided with two front inner rings 41 and front outer rings 42 with progressively increasing diameters, concentrically. The front inner ring 41 is inserted between the middle annular edge 33 and the outer annular edge 34, and its inner surface is provided with a front inner thread that matches the front outer thread. This threaded connection makes the connection between the insert shell 3 and the handle shell 4 more secure and reliable, facilitates disassembly and assembly, and improves production efficiency and maintenance convenience. The front outer ring 42 abuts against the outer annular edge 34. Preferably, the abutting surfaces of the front outer ring 42 and the outer annular edge 34 are inclined surfaces. When the handle shell 4 and the insert shell 3 are tightened, the interaction between the inclined surfaces generates greater friction and clamping force, enhancing the sealing between the handle shell 4 and the insert shell 3 and resulting in a better fit.

[0026] The conical claw 6 is located at the tail of the handle housing 4. The screw cap 5 has a through hole through which the cable 7 passes. The cable 7 passes through the through hole and the conical claw 6 and extends into the handle housing 4. The core of the cable 7 is inserted into the axial insertion hole 21. The radial screw hole 22 is screwed with a locking screw 23 to press the core tightly.

[0027] The outer circumferential surface of the tail end of the handle housing 4 is provided with a rear external thread adapted to the screw cap 5. The screw cap 5 has a boss 51 inside that can abut against the conical claw 6 and close during forward movement. The screw cap 5 is tightened to the tail end of the handle housing 4 through the engagement with the rear external thread, and the boss 51 presses the conical claw 6 to close and tighten the cable 7, achieving a secure fixation of the cable 7. Furthermore, the tightness of the screw cap 5 can be adjusted according to actual needs to accommodate cables 7 of different diameters or materials, improving the plug's versatility and practicality. Preferably, a sheath 10 is fitted onto the cable 7 at the position corresponding to the conical claw 6, and the tail end face of the handle housing 4 has a slot 43 for inserting the front end of the sheath 10, ensuring good assembly stability. The sheath 10 protects the cable 7 from damage at the position of the conical claw 6, extending the service life of the cable 7.

[0028] The exposed core at the other end of the cable 7 is inserted into the riveting cylinder of the annular terminal 8 and then riveted together, so that the annular terminal 8 is placed on the core at the other end of the cable 7.

[0029] During connection, due to the modular design of this invention, the insert shell 3, handle shell 4, and screw cap 5 can be disassembled. The wire core at one end of the cable 7 passes through the window of the screw cap 5, conical claw 6, sheath 10, handle shell 4, and cover 9, and is inserted into the axial insertion hole 21 of the PIN. Then, the locking screw 23 is screwed into the radial screw hole 22 to press the wire core tightly, thus achieving electrical connection and fixation between the wire core and the PIN. Next, screwing the screw cap 5 compresses the conical claw 6 to close, thereby pressing the cable 7 and completing the mechanical fixation of the cable 7.

[0030] When the connection of cable 7 is damaged, the cap 5 and the handle 4 can be unscrewed to cut off the damaged part of cable 7. Then, the insulation of the intact part of cable 7 can be stripped to expose the wire core. Then, the above steps can be performed to assemble the cable. The operation is simple and convenient.

[0031] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. Connectors with other structures obtained using the same or similar structures as described in the above embodiments of this utility model are all within the protection scope of this utility model.

Claims

1. A 3P plug harness structure, comprising a base and three pins embedded in the base, characterized in that: It also includes a housing, a handle housing, a screw cap, a conical claw, a cable, and an annular terminal. The foot is fixedly mounted on the housing. The tail end face of the PIN has an axial insertion hole, and the circumferential surface of the tail end has a radial screw hole communicating with the axial insertion hole. The front end of the handle housing is connected to the tail end of the housing. The conical claw is located at the tail end of the handle housing. The screw cap has a through hole for the cable to pass through. The cable passes through the through hole and the conical claw and extends into the handle housing, with the core of the cable inserted into the axial insertion hole. A locking screw is screwed into the radial screw hole to press the core tightly. The screw cap is screwed onto the tail end of the handle housing and squeezes the conical claw to close and press the cable. The annular terminal is located on the core at the other end of the cable.

2. The 3P plug harness structure according to claim 1, characterized in that, The back periphery of the foot is provided with several inlay grooves, and the insert housing is provided with an assembly step that matches the foot. The assembly step is provided with an inlay protrusion that matches the inlay groove.

3. The 3P plug harness structure according to claim 1, characterized in that, The back of the foot is provided with a protective sleeve corresponding to the position of the PIN, which covers the tail of the PIN. The protective sleeve has a notch that exposes the axial insertion hole and the radial screw hole.

4. The 3P plug harness structure according to claim 3, characterized in that, The tail end opening face of the insert has three annular edges, a middle annular edge and an outer annular edge with progressively increasing diameters, all centered on the same circle. The outer wall of the inner annular edge is provided with a front external thread. The front end opening face of the handle has two front inner rings and a front outer ring with progressively increasing diameters, all centered on the same circle. The front inner ring is inserted between the middle annular edge and the outer annular edge, and its inner surface is provided with a front inner thread that matches the front external thread. The front outer ring abuts against the outer annular edge.

5. The 3P plug harness structure according to claim 4, characterized in that, The contact surface between the front outer ring and the outer ring edge is an inclined surface.

6. The 3P plug harness structure according to claim 4, characterized in that, The inner annular edge is provided with a cover to close its opening, and the cover is provided with a window corresponding to the notch.

7. The 3P plug harness structure according to claim 4, characterized in that, The outer circumferential surface of the tail end of the handle is provided with a rear external thread that is adapted to the screw cap.

8. The 3P plug harness structure according to claim 4, characterized in that, The cable is fitted with a sheath corresponding to the position of the conical claw, and the tail end face of the handle is provided with a slot for inserting the front end of the sheath.

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