An emergency wire cutter to prevent inter-core short circuits

Abstract

An emergency wire cutter to prevent inter-core short circuits includes pliers with two jaws, each with a cutting section. Each cutting section includes a mounting block fixedly connected to the jaws, a slot on the mounting block, and multiple cutting blades stacked within the slot. The cutting blades have a triangular shape at one end outside the slot and an insulating portion outside the cutting blades. An end cap is located at one end of the slot, connected to the mounting block by screws, and the end cap presses the multiple cutting blades firmly within the slot. This invention addresses the problem of short circuits caused by existing wire cutters when cutting live multi-core cables.

Description

Technical Field

[0001] This utility model relates to an emergency wire cutter that prevents short circuits between wires. Background Technology

[0002] Multi-core cables and twisted-pair wires are widely used in power facility maintenance and emergency repairs. However, situations often arise where the power switch cannot be located or contacted in a timely manner, necessitating emergency cutting of multi-core cables or twisted-pair wires. Currently, most commercially available scissors or wire cutters have blades made of metal. When using these tools to cut multi-core cables, the blades easily break through the insulation layer outside the wire cores, thus contacting the metal parts of the cores. Simultaneously, the opposite blade also breaks through the insulation layer, contacting the metal parts of other wire cores. This results in a short circuit between the wire cores cut by the scissors and the wire cores cut by the opposite blade, potentially leading to serious consequences such as equipment damage, power system failures, and even endangering the safety of operators. Therefore, developing emergency wire cutters that can avoid short circuits when cutting live multi-core cables has become a pressing technical challenge in this field. Utility Model Content

[0003] The purpose of this invention is to provide an emergency wire cutter that avoids short circuits between cores, thereby solving the problem that existing wire cutters cause short circuits when cutting live multi-core cables.

[0004] To solve the above problems, the technical solution of this utility model is as follows:

[0005] An emergency wire cutter for preventing inter-core short circuits includes pliers with two jaws. Each jaw has a cutting part. The cutting part includes a mounting block fixedly connected to the jaws. The mounting block has a slot, in which multiple cutting blades are stacked. The cutting blades are triangular at one end outside the slot and have an insulating part outside the cutting blades. An end cap is provided at one end of the slot and is connected to the mounting block by screws. The end cap presses the multiple cutting blades tightly into the slot.

[0006] Furthermore, notches are provided on both sides of the shearing blade, and protruding ridges are provided on both sides of the slot, with the protruding ridges fitting into the notches.

[0007] Furthermore, a set screw is threaded onto the end cap, with one end of the set screw pressing against the shear plate.

[0008] Furthermore, a gasket is provided between the set screw and the shear plate.

[0009] Furthermore, the insulating part includes multiple first insulating papers and second insulating papers disposed in the groove, with each first insulating paper disposed between each sheared sheet, and each sheared sheet coated with insulating varnish.

[0010] Furthermore, the pliers are bolt cutters.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. By setting a double insulation structure consisting of multiple first insulating papers, second insulating paper in the groove, and insulating varnish on the outside of the shearing blades, mutual insulation between the shearing blades and between the shearing blades and the mounting block can be ensured. Even if the insulating varnish on the tip of the shearing blade is worn away during the cable cutting process, the insulation between the shearing blades still exists, thereby preventing the wire cores from forming a circuit connection through the shearing blades and fundamentally preventing the occurrence of short circuits between cores.

[0013] 2. Using bolt cutters as the basic clamp body, the longer clamp bar allows the operator to stay away from the cable when using it, greatly reducing the risk of electric shock to the operator and making the operation process safer and more reliable.

[0014] 3. The bolt cutters provide sufficient cutting force, making cable cutting easier and less strenuous. Furthermore, these bolt cutters eliminate the need for cumbersome procedures such as waiting for the power switch to trip or making phone inquiries; they can directly cut the cable, significantly saving emergency repair time and improving work efficiency. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a partial three-dimensional structural diagram of the present invention.

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0019] In the diagram: 1. Pliers; 2. Mounting block; 3. Cutting blade; 4. End cap; 5. Screw; 6. Set screw; 7. First insulating paper; 8. Rib; 9. Washer; 10. Second insulating paper. Detailed Implementation

[0020] 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.

[0021] like Figures 1 to 3As shown, an emergency wire cutter for preventing inter-core short circuits includes pliers 1, which has two jaws and a cutting part on each jaw. The cutting part includes a mounting block 2 fixedly connected to the jaws. The mounting block 2 has a square slot, one end of which is closed and the other end is open. Multiple cutting blades 3 are stacked in the slot. The ends of the cutting blades 3 outside the slot are triangular, and the triangular tips of the multiple cutting blades 3 form the cutting edge of the wire cutter. An insulating part is provided outside the cutting blades 3 to insulate them from each other. An end cap 4 is provided at the open end of the slot. The end cap 4 is connected to the mounting block 2 by screws 5. The end cap 4 presses the multiple cutting blades 3 tightly in the slot.

[0022] In use, the shearing blades 3 are placed one by one into the slot, and then the end cap 4 is installed. At the same time, the screw 5 is tightened, and the end cap 4 presses the multiple shearing blades 3 into the slot. When it is necessary to cut the cable, the jaws push the shearing part to apply pressure to the cable, and the triangular tips of the multiple shearing blades 3 simultaneously cut into the insulation layer of the wire core. The insulating varnish first contacts the metal of the wire core, but blocks the current due to its insulation properties. If the insulating varnish is worn, the insulating part between the shearing blades 3 continues to isolate different wire cores to prevent conduction through the blades.

[0023] Furthermore, notches are provided on both sides of the shearing blade 3, and protruding ridges 8 are provided on both sides of the slot. The protruding ridges 8 are engaged within the notches. This structure is used to position the shearing blade 3, limit its displacement within the slot, ensure that the blade position is fixed during shearing, prevent the insulation paper from shifting or tearing due to shaking, and ensure the reliability of the insulation structure.

[0024] Furthermore, a set screw 6 is threaded onto the end cap 4, with one end of the set screw 6 pressing against the shearing plate 3. The set screw 6 on the end cap can be tightened to press against the shearing plate 3, compensating for machining errors or wear of the shearing plate 3 caused by long-term use, ensuring that the shearing plate always fits tightly against the slot, and avoiding gaps caused by loosening that would reduce the insulation effect.

[0025] Furthermore, a gasket 9 is provided between the set screw 6 and the shear plate 3. The gasket 9 can prevent the set screw 6 from damaging the surface insulation layer of the shear plate 3 and maintain the surface insulation integrity.

[0026] Furthermore, the insulating part includes multiple first insulating paper sheets 7 and second insulating paper sheets 10 disposed in the groove. Each first insulating paper sheet 7 is disposed between each shearing sheet 3. Each shearing sheet 3 is coated with insulating varnish. The insulating varnish is an organosilicon insulating varnish with a temperature resistance range of -60℃ to 200℃ and a breakdown voltage ≥20kV / mm.

[0027] The first insulating paper 7 is sandwiched between each shearing blade 3, blocking metal-to-metal contact between adjacent shearing blades 3. When the cable is cut, even if multiple wire cores contact different shearing blades 3, the first insulating paper 7 can prevent current from forming a circuit through the shearing blades. The second insulating paper 10 is laid at the bottom of the slot, isolating the shearing blade 3 from the mounting block (metal material), preventing the wire cores from forming a short circuit through the mounting block and the jaws. The outer surface of the shearing blade 3 is coated with epoxy resin insulating varnish, forming a wear-resistant insulating layer. Even if the insulating varnish at the tip is damaged by friction during cutting, the inner insulating paper can still maintain inter-blade insulation, forming redundant protection. This forms double insulation, ensuring that the wire cores do not conduct electricity through the blades when cut, avoiding short circuits and secondary accidents.

[0028] Furthermore, both the first insulating paper 7 and the second insulating paper 10 are polyimide insulating papers. This type of insulating paper has high insulation strength, high temperature resistance, and good flexibility, and can maintain stable insulation performance over a long period of time in complex environments.

[0029] Furthermore, the pliers 1 are bolt cutters. Bolstering pliers are designed with sufficiently long handles to keep the operator away from the cable, making them safer to use. They also amplify the shearing force through leverage; when the operator applies force to the handles, the jaws drive the cutting section to generate high-intensity shearing force, ensuring rapid cutting of multi-core cables.

[0030] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this utility model should not be considered as limited to the specific forms described in the embodiments. The scope of protection of this utility model also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. An emergency wire cutter for avoiding inter-core short circuit, comprising a pair of pliers (1) having two jaws, characterized in that: Each jaw is provided with a shearing part, which includes a mounting block (2) fixedly connected to the jaw. The mounting block (2) is provided with a slot, and multiple shearing blades (3) are stacked in the slot. The shearing blade (3) is triangular at one end outside the slot. An insulating part is provided outside the shearing blade (3). An end cap (4) is provided at one end of the slot. The end cap (4) is connected to the mounting block (2) by screws (5). The end cap (4) presses the multiple shearing blades (3) tightly in the slot.

2. The emergency wire breaking pliers for avoiding inter-core short circuit according to claim 1, characterized in that: Notches are provided on both sides of the shearing piece (3), and protrusions (8) are provided on both sides of the slot, the protrusions (8) being inserted into the notches.

3. The emergency wire breaking pliers to avoid inter-core short circuit according to claim 1, characterized in that: A set screw (6) is threaded onto the end cap (4), and one end of the set screw (6) is pressed onto the shear plate (3).

4. The emergency wire breaking pliers to avoid inter-core short circuit according to claim 1, characterized in that: A gasket (9) is provided between the set screw (6) and the shear plate (3).

5. The emergency wire cutter that avoids inter-core short circuit according to claim 1, characterized in that: The insulating part includes multiple first insulating paper (7) and second insulating paper (10) disposed in the groove. Each first insulating paper (7) is disposed between each shearing sheet (3), and each shearing sheet (3) is coated with insulating varnish.

6. The emergency wire cutter that avoids inter-core short circuit according to claim 5, characterized in that: Both the first insulating paper (7) and the second insulating paper (10) are polyimide insulating papers.

7. The emergency wire cutter that avoids inter-core short circuit according to claim 1, characterized in that: The pliers (1) are bolt cutters.

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