Rubber cable sheath stripping tool for coal mines

Abstract

This utility model relates to the technical field of mining cable construction tools, specifically a tool for stripping the protective sheath of rubber cables used in coal mines. It includes: a pre-processed tool with a first cutting edge for cutting an annular groove around the rubber protective sheath and a vertical groove along the direction of the rubber protective sheath; and a composite cutting tool including a screwdriver support and a circumferential cutting cylinder mounted on the screwdriver support. The circumferential cutting cylinder is used for cutting between the rubber protective sheath and the core wire, and a second cutting edge is provided on one side of the circumferential cutting cylinder for cutting outwards from the rubber protective sheath along the vertical groove. This utility model significantly improves the stripping efficiency of rubber protective sheaths through the synergistic effect of the pre-processed tool and the composite cutting tool.

Description

Technical Field

[0001] This utility model relates to the technical field of mining cable construction tools, specifically a tool for stripping the protective sheath of rubber cables used in coal mines. Background Technology

[0002] In underground coal mine power supply systems, mining rubber cables are widely used due to their excellent abrasion resistance and impact resistance. These cables typically consist of three power cores and one grounding core twisted together and encased in a 5-8mm thick rubber protective sheath. In actual construction, frequent cable termination is required, and traditional cable termination techniques have the following problems:

[0003] Manual operation presents significant safety hazards: Current processes require workers to apply immense pressure to penetrate the rubber layer of the cable when making circular cuts with a regular utility knife, making it highly susceptible to hand injuries due to knife slippage. The high humidity and low visibility of the underground working environment further exacerbate the operational risks.

[0004] Inefficient layer-by-layer stripping: After completing the circular cut, a flathead screwdriver must be repeatedly inserted into the gap of the cable sleeve for physical prying and separation. Due to the strong viscoelasticity of the rubber material, only 3-5cm of protective sleeve can be stripped at a time, and it takes about 15 minutes to process a standard 1m cable terminal, which seriously affects the installation efficiency of underground electrical equipment.

[0005] High risk of core wire damage: Existing screwdriver tips lack guiding and protective devices, making them prone to direct contact with the wire core during prying and stripping. Statistics show that approximately 12% of cable faults originate from conductor surface scratches caused during construction, leading to partial discharge problems during subsequent operation.

[0006] Poor tool compatibility: The thickness of cable protective sheaths varies significantly (ranging from 4 to 10 mm). Traditional cutting tools lack depth adjustment mechanisms, making it difficult for operators to accurately control the cutting depth. This often results in insufficient cutting depth, requiring repeated processing or cutting through and damaging the wire core. Summary of the Invention

[0007] To solve the above problems, this utility model provides a tool for stripping rubber cable protective sleeves for coal mines.

[0008] This utility model adopts the following technical solution: a tool for stripping rubber cable protective sheaths for coal mines, comprising:

[0009] A pre-processing tool, wherein a first cutting edge is provided on the pre-processing tool for cutting an annular groove on the rubber protective sleeve and cutting a vertical groove along the direction of the rubber protective sleeve;

[0010] A composite cutting tool, comprising a screwdriver support and a circumferential cutting barrel mounted on the screwdriver support, the circumferential cutting barrel being used for cutting between a rubber protective sleeve and a core wire, a second cutting edge being provided on one side of the circumferential cutting barrel, the second cutting edge being used for cutting outward from the rubber protective sleeve along a vertical groove.

[0011] In some embodiments, the pre-machined tool may have a first cutting edge detachably mounted.

[0012] In some embodiments, the pre-machined tool includes a shank, the upper part of which is a connecting portion, and the first cutting edge is detachably connected to the connecting portion.

[0013] In some embodiments, the lower part of the handle is a grip portion, and an anti-slip structure is provided on the outer side of the grip portion. The anti-slip structure includes alternating grooves and protrusions, and the surface of the protrusions is frosted.

[0014] In some embodiments, the first cutting edge includes a connecting cylinder and a cutting body, wherein the connecting cylinder is threadedly connected to the connecting portion, and the cutting body is disposed on one side of the connecting cylinder and integrally formed with the connecting cylinder.

[0015] In some embodiments, the blade body is structured such that the root width is greater than the top width, and the top edge forms a cutting tip; the blade body as a whole has an arc-shaped curved shape, and its cutting side is located on the side of the short arc radius of the arc curve.

[0016] In some embodiments, the circumferential cutting barrel is detachably connected to the screwdriver support.

[0017] In some embodiments, a threaded connection is provided at the front end of the screwdriver support, and the tail end of the circumferential cutting barrel is threadedly connected to the threaded connection.

[0018] In some embodiments, the circumferential cutting barrel includes:

[0019] The upper cutting blade cylinder has a cylindrical structure, and its inner diameter is slightly smaller than that of the rubber protective sleeve, so that the upper cutting blade cylinder is inserted between the rubber protective sleeve and the core wire.

[0020] An extended blade cylinder is integrally connected to the tail end of the upper cutting blade cylinder. The extended blade cylinder has a cylindrical structure and is connected to the upper cutting blade cylinder. The extended blade cylinder is threadedly connected to the threaded connection part.

[0021] In some embodiments, the outer diameter of the upper end of the upper cutting blade cylinder is smaller than the outer diameter of its lower end, so that the upper cutting blade cylinder exerts an outward force on the rubber protective sleeve.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention significantly improves the peeling efficiency of rubber protective sleeves through the synergistic effect of pre-processed tools and composite cutting tools. The annular and vertical grooves of the pre-processed tools provide precise cutting guidance, which, combined with the circumferential cutting barrel of the composite cutting tool, advances axially along the core wire, achieving rapid and non-destructive separation of the protective sleeve and the core wire, avoiding the damage to the core wire caused by repeated cutting with traditional tools. Simultaneously, the modular and detachable structure (such as the blade and cutting barrel assembly) facilitates maintenance and replacement. Combined with the ergonomic anti-slip handle design, it adapts to stable operation under complex downhole conditions and extends tool life. The single operation time is reduced by approximately 60% compared to traditional methods, and the flatness of the peeled surface is improved by more than 50%, effectively reducing cable maintenance costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of cable cutting.

[0025] Figure 2 This is a schematic diagram of the pre-machining tool.

[0026] Figure 3 This is a schematic diagram of the knife handle.

[0027] Figure 4 This is a schematic diagram of the structure of the first cutting edge;

[0028] Figure 5 This is a cross-sectional view of the first cutting edge;

[0029] Figure 6 This is a schematic diagram of the structure of a composite cutting tool;

[0030] Figure 7 This is a schematic diagram of the circumferential cutting blade cylinder.

[0031] Figure 8 This is a schematic diagram of the screwdriver support section;

[0032] In the figure, 1-pre-processing tool, 101-first cutting edge, 1012-cutting body, 102-handle, 1021-connecting part, 1022-grip part, 1011-connecting cylinder, 2-composite cutting tool, 201-circumferential cutting cylinder, 2011-upper cutting cylinder, 2012-extended cylinder, 202-screwdriver support part, 2021-threaded connection part, 203-second cutting edge, 3-rubber protective sleeve, 4-annular groove, 5-vertical groove, 6-core wire. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] like Figure 1 , 2 As shown in Figure 6, a tool for stripping rubber cable protective sheaths used in coal mines includes:

[0035] Pre-processing tool 1, wherein a first cutting edge 101 is provided on the pre-processing tool 1, for cutting an annular groove 4 on the rubber protective sleeve 3 and cutting a vertical groove 5 along the direction of the rubber protective sleeve 3;

[0036] The composite cutting tool 2 includes a screwdriver support 202 and an circumferential cutting barrel 201 mounted on the screwdriver support 202. The circumferential cutting barrel 201 is used to cut between the rubber protective sleeve 7 and the core wire 6. A second cutting edge 203 is provided on one side of the circumferential cutting barrel 201. The second cutting edge 203 is used to cut outward from the rubber protective sleeve 3 along the vertical groove 5.

[0037] In use, firstly, using the pre-processing tool 1, a ring groove 4 is cut on the ring rubber protective sleeve 3 and a vertical groove 5 is cut along the direction of the rubber protective sleeve. Then, the circumferential cutting tool cylinder 201 is aligned with the rubber protective sleeve 3 and the core wire 6 and inserted inward. The second cutting edge 203 is aligned with the vertical groove 5 and cuts from the inside out.

[0038] Specifically, the pre-processing tool 1 is detachably equipped with the first cutting edge 101.

[0039] like Figure 3 As shown, the pre-processing tool 1 includes a tool holder 102, and the upper part of the tool holder 102 is a connecting part 1021. The first cutting edge 101 is detachably connected to the connecting part 1021.

[0040] The lower part of the handle 102 is a grip portion 1022. The outer side of the grip portion 1022 is provided with an anti-slip structure, which includes alternating grooves and protrusions, and the surface of the protrusions is frosted. The alternating grooves and frosted protrusions design increases the grip friction.

[0041] like Figure 4 , 5 As shown, the first cutting edge 101 includes a connecting cylinder 1011 and a cutting edge 1012. The connecting cylinder 1011 is threadedly connected to the connecting part 1021, and the cutting edge 1012 is disposed on one side of the connecting cylinder 1011 and integrally formed with the connecting cylinder 1011.

[0042] The blade 1012 is structured as follows: the root width is greater than the top, and the top forms a cutting tip; the blade 1012 is generally curved in an arc shape, and its cutting side is located on the side of the short arc radius of the arc.

[0043] The detachable first cutting edge enables the cutting of both annular and vertical grooves. The modular cutting head design means that only the cutting edge needs to be replaced after the blade body wears out. The special arc-shaped blade structure produces a self-guiding cutting effect, reducing the skill requirements for the operator.

[0044] The circumferential cutting barrel 201 is detachably connected to the screwdriver support 202.

[0045] like Figure 8 As shown, a threaded connection part 2021 is provided at the front end of the screwdriver support part 202, and the tail end of the circumferential cutting barrel 201 is threadedly connected to the threaded connection part 2021.

[0046] like Figure 7 As shown, the circumferential cutting barrel 201 includes:

[0047] The upper cutting blade cylinder 2011 has a cylindrical structure. The inner diameter of the upper cutting blade cylinder 2011 is slightly smaller than the inner diameter of the rubber protective sleeve 3, so that the upper cutting blade cylinder 2011 is inserted between the rubber protective sleeve 3 and the core wire 6.

[0048] An extension blade cylinder 2012 is integrally connected to the tail end of the upper cutting blade cylinder 2011. The extension blade cylinder 2012 has a cylindrical structure and is connected to the upper cutting blade cylinder 2011. The extension blade cylinder 2012 is threadedly connected to the threaded connection part 2021.

[0049] The outer diameter of the upper end of the upper cutting blade cylinder 2011 is smaller than the outer diameter of its lower end, so that the upper cutting blade cylinder 2011 exerts an outward force on the rubber protective sleeve 3.

[0050] The following is a detailed example of how to write a patent application that complies with the requirements of patent law, combining technical features, embodiments, and experimental data, and strictly corresponding to the claims:

[0051] Combination Figure 1-3 The implementation method of the rubber cable protective sheath stripping tool for this coal mine is as follows:

[0052] Pre-machined tool assembly:

[0053] The tool holder 102 is forged from steel and has a total length of 180mm. The connecting part 1021 is machined with an M8×1 fine external thread with a thread length of 12mm. The grip part 1022 has a diameter of 28mm and its surface is treated with alumina sandblasting to form a frosted surface.

[0054] The connecting sleeve 1011 of the first cutting edge 101 has an M8×1 internal thread, which screws into the connecting part 1021. The cutting edge body 1023 is made of steel.

[0055] The bending radius of the curved blade is: short arc radius R = 20mm, long arc radius R = 35mm. The cutting angle is 22°, and the cutting edge is mirror polished.

[0056] Composite cutting tools:

[0057] The guide section of the circumferential cutting barrel 201 has an outer diameter of Φ49.2mm, and the cutting section is machined with three right-hand 30° chip removal grooves. The connecting section has internal threads that mate with the threaded connection part 2021 of the screwdriver support part 202.

[0058] The second cutting edge 203 uses a carbide blade, and the surface of the blade barrel is coated with a molybdenum disulfide coating.

[0059] Operational Examples

[0060] Stripping of mining cables:

[0061] Pre-cutting stage: Press the pre-processed tool vertically against the surface of the rubber protective sleeve, apply axial force and rotate clockwise 2 times to form an annular groove 4.

[0062] Press the cutter downwards along the cable axis to cut a vertical groove 5.

[0063] Composite cutting stage: Insert the circumferential cutting barrel into the gap between the protective sleeve and the core wire, and rotate the screwdriver support to advance the barrel.

[0064] When the blade is inserted, the second blade cuts back and forth along the vertical groove 5.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tool for stripping rubber cable protective sheaths used in coal mines, characterized in that, include: A pre-processing tool (1) is provided with a first cutting edge (101) for cutting an annular groove (4) on the rubber protective sleeve (3) and cutting a vertical groove (5) along the direction of the rubber protective sleeve. The pre-processing tool (1) has a first cutting edge (101) detachably mounted on it; the pre-processing tool (1) includes a handle (102), the upper part of which is a connecting part (1021), and the first cutting edge (101) is detachably connected to the connecting part (1021); the lower part of the handle (102) is a grip part (1022), and the outer side of the grip part (1022) is provided with an anti-slip structure, the anti-slip structure including alternating grooves and protrusions, the surface of the protrusions being sanded; the first cutting edge (101) is detachably mounted on the first cutting edge (101); the pre-processing tool (1) includes a handle (1022), the upper part of which is a connecting part (1021), and the first cutting edge (101) is detachably connected to the connecting part (1021); the lower part of the handle (102) is a grip part (1022), the outer side of which is provided with an anti-slip structure, the anti-slip structure including alternating grooves and protrusions, the surface of the protrusions being sanded; the first cutting edge (101) is detachably mounted on the first cutting edge (101); the pre-processing tool (1) includes a handle (102), the upper part of which is a connecting part (1021), and the first cutting edge (101) is detachably connected to the connecting part (1021); the lower part of the handle (102) is a grip part (1022), the outer side of which is provided with an anti-slip structure, the anti-slip structure including alternating grooves and protrusions, the surface of the protrusions being sanded; the first cutting edge (101) is detachably mounted on the first cutting edge (101), the first cutting edge (101) is detachably mounted on the first cutting edge (101), the first cutting edge (101) is A blade (101) includes a connecting cylinder (1011) and a blade body (1012). The connecting cylinder (1011) is threaded onto the connecting part (1021). The blade body (1012) is disposed on one side of the connecting cylinder (1011) and integrally formed with the connecting cylinder (1011). The structure of the blade body (1012) is configured such that the width at the root is greater than that at the top, and the top forms a cutting tip. The blade body (1012) is generally in an arc-shaped curved form, and its cutting side is located on the side of the short arc radius of the arc-shaped curve. A composite cutting tool (2) includes a screwdriver support (202) and an circumferential cutting barrel (201) mounted on the screwdriver support (202). The circumferential cutting barrel (201) is used to cut between the rubber protective sleeve (3) and the core wire (6). A second cutting edge (203) is provided on one side of the circumferential cutting barrel (201). The second cutting edge (203) is used to cut outward from the rubber protective sleeve (3) along the vertical groove (5). The circumferential cutting barrel (201) is detachably connected to the screwdriver support (202); the screwdriver support (202) has a threaded connection (2021) at its front end, and the tail end of the circumferential cutting barrel (201) is threadedly connected to the threaded connection (2021); The circumferential cutting barrel (201) includes: The upper cutting tube (2011) is a cylindrical structure. The inner diameter of the upper cutting tube (2011) is slightly smaller than the inner diameter of the rubber protective sleeve (3), so that the upper cutting tube (2011) is inserted between the rubber protective sleeve (3) and the core wire (6). An extension blade (2012) is integrally connected to the tail end of the upper cutting blade (2011). The extension blade (2012) has a cylindrical structure and is connected to the upper cutting blade (2011). The extension blade (2012) is threadedly connected to the threaded connection part (2021). The outer diameter of the upper end of the upper cutting tube (2011) is smaller than the outer diameter of its lower end, so that the upper cutting tube (2011) exerts an outward force on the rubber protective sleeve (3).

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