Power plug cord capable of preventing cord breakage

Abstract

The invention relates to a power plug cord capable of preventing line breakage. The power plug cord comprises a power plug (1), a plug cord (2) and a wire anti-folding head (3) arranged at the joint of the power plug (1) and the plug cord (2), long cavities (4) which are insulated from each other and sealed are arranged in the wire anti-folding head (3); and a staggered overlapping section (7) is reserved between the two wire core bundles in each long cavity (4). The problem that an existing power plug cord is broken and cannot be used after being repeatedly used can be fundamentally solved.

Description

Technical Field

[0001] The invention relates to the technical field of power plug cords, in particular to a power plug cord capable of preventing the cord from breaking. Background Art

[0002] The power plug cord includes a power plug and a plug cord. At the connection between the power plug and the plug cord, the power plug is repeatedly plugged in and out during use, causing the connection to be repeatedly bent and stressed, which can easily lead to fatigue and breakage of the copper wire core, making it unusable. Although the prior art provides an anti-bend head for the wire at the connection between the plug cord and the plug cord, the anti-bend effect is still unsatisfactory. The reason for this is that one end of the copper wire core bundle at the anti-bend head connection is welded to the power plug electrode, and the other end is tightly bound by the insulation layer with very little room for movement. Although the anti-bend head is wrapped with a thicker protective layer and becomes hardened, the transition to the wire part is still a soft wire. In actual use, this is equivalent to transferring the turning point of the anti-bend head to the transition position of the anti-bend head. When the transition position is bent, the arc radius generated by one end of the wire being restrained by the harder anti-bending head is smaller than that of the wire with both ends free. The copper wire core at the bending point will have a deviation in the bending radius due to the thickness of the wire bundle stacking; the copper wire far from the center of the bending arc has a large bending radius, and the copper wire is stretched and deformed by a large tensile force, while the copper wire close to the center of the bending arc has a small bending radius, is stretched less and is also less stressed; the repeated action of such uneven tension causes fatigue fracture of the copper wire core bundle at the bending point.

[0003] In order to solve this problem, on January 25, 2022, China Utility Model Authorization Announcement No. CN215645218U disclosed a power plug cord with an anti-breakage structure, in which a first anti-bend joint is provided at one end of the plug cord, and a second anti-bend joint is provided at the other end of the plug cord. This technical solution is to use the anti-bend joint to protect the power plug cord from bending, thereby achieving the purpose of preventing breakage. But in fact, the power plug cord itself is a mobile power feeding device, and it is inevitable that the cable will be bent during use. The anti-breakage technical means of this technology only solves the problem of preventing the connection between the power plug and the plug cord of the power plug cord from breaking, or in other words, it only shifts the position of the breakage point.

[0004] Therefore, the problem of the existing power plug wire being broken after repeated use has not been fundamentally solved. Summary of the Invention

[0005] The object of the present invention is to provide a power plug cord that is resistant to breakage, which can fundamentally solve the problem in the above-mentioned background art that the existing power plug cord is broken and cannot be used after repeated use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a power plug cord that prevents wire breakage, comprising a power plug, a plug cord, and a wire breakage prevention head provided at the connection between the power plug and the plug cord. The invention is characterized in that a corresponding number of insulated and sealed elongated cavities are provided within the wire breakage prevention head, corresponding to the number of wires contained in the plug cord. In each elongated cavity, a first wire welded to a power plug electrode and a second wire from the power cord end are pre-insulated to expose the wire core bundle, and then inserted from either end of the elongated cavity. An overlapping section of the two wire core bundles remains within the elongated cavity, and the insulation layers of the first wire welded to the power plug electrode and the second wire from the power cord end are integrally fixedly connected to the wire breakage prevention head material. The gaps within the elongated cavities are also filled with graphite powder.

[0007] Compared with the prior art, the present invention has the following advantages: by providing a sealed elongated cavity within the anti-bend head, the relative movement of the interlaced and overlapping wire cores within the cavity offsets the varying tensile forces caused by the varying bending radiuses of the wire cores when the anti-bend head is bent at the transition point. The present invention fills the gaps within the elongated cavity with graphite powder, creatively utilizing the conductive properties of the graphite powder to eliminate sparks generated by the relative movement of the interlaced and overlapping wire cores within the cavity. This prevents the interlaced and overlapping wire cores from being eroded and lubricates their movement, thereby overcoming the technical problem of fatigue fracture of the copper wire core bundle at the bend point caused by repeated uneven tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the external structure of the present invention.

[0009] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0010] In the figure: 1 power plug; plug cord; 3 wire anti-bend head; 4 elongated cavity; 5 first wire; 6 second wire; 7 staggered overlapping section. DETAILED DESCRIPTION

[0011] In this embodiment, refer to Figure 1 、 Figure 2A power plug cord that prevents wire breakage includes a power plug 1, a plug cord 2, and a wire anti-bending head 3 provided at the connection between the power plug 1 and the plug cord 2; a corresponding number of insulated and sealed elongated cavities 4 are provided in the wire anti-bending head 3 according to the number of wires contained in the plug cord; on each elongated cavity 4, a first wire 5 welded to an electrode of the power plug 1 and a second wire 6 from an end of the power cord are pre-stripped of their insulation layers to expose the wire core bundles, and then inserted from both ends of the elongated cavity 4, respectively, and an interlaced overlapping section 7 is retained in the elongated cavity 4 for the two wire core bundles, and the insulation layers of the first wire 5 welded to the electrode of the power plug 1 and the insulation layers of the second wire 6 from the end of the power cord are fixedly connected to the material of the wire anti-bending head 3 as a whole.

[0012] In actual use, when the transition part of the wire anti-bending head 3 is bent, the copper wire core is composed of two sections of cores that are staggered and overlapped in the elongated cavity 4 and are not a whole; no matter how much deviation and stretching movement the copper wire core bent at the transition part produces due to the deviation in the thickness and bending radius of the wire bundle stacking, the staggered and overlapping sections 7 of the core in the elongated cavity 4 will move relatively to compensate for the stretching; thereby, the core bundle will not be broken to cause fatigue fracture, and the electrical connection will not be affected.

[0013] In order to eliminate the sparks generated by the relative movement of the wire cores of the staggered overlapping sections 7 in the elongated cavity 4 , the gaps in the elongated cavity 4 are filled with graphite powder.

[0014] In order to prevent the wire core in the elongated cavity 4 from being ablated by electric sparks, an inert gas is also filled in the gap in the elongated cavity 4. The inert gas can be nitrogen, argon, or a mixture of the two.

[0015] In addition, the above embodiments are only illustrative of the principles and effects of the present invention. For those skilled in the art, any modifications and improvements made without departing from the inventive concept of the present invention are within the scope of protection of the present invention.

Claims

1. A power plug cord that prevents wire breakage, comprising a power plug (1), a plug cord (2), and a wire anti-breakage head (3) provided at the connection between the power plug (1) and the plug cord (2); characterized in that: A corresponding number of mutually insulated and sealed elongated cavities (4) are provided in the wire anti-bending head (3) according to the number of wires contained in the plug wire; in each elongated cavity (4), the first wire (5) welded to the electrode of the power plug (1) and the second wire (6) from the end of the power cord are pre-stripped of the insulation layer to expose the wire core bundle, and then inserted from both ends of the elongated cavity (4), and the two wire core bundles retain an interlaced overlapping section (7) in the elongated cavity (4), and the insulation layer of the first wire (5) welded to the electrode of the power plug (1) and the insulation layer of the second wire (6) from the end of the power cord are integrally fixedly connected to the material of the wire anti-bending head (3); The gaps in the elongated cavity (4) are filled with graphite powder.

2. A power plug cord that prevents wire breakage according to claim 1, characterized in that: The gap in the elongated cavity (4) is filled with an inert gas.

3. The anti-breakage power plug cord according to claim 2, characterized in that: The inert gas is nitrogen.

4. The anti-breakage power plug cord according to claim 2, characterized in that: The inert gas is argon.

5. The anti-breakage power plug cord according to claim 2, characterized in that: The inert gas is a mixture of nitrogen and argon.

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