A kind of optical fiber composite rubber sheathed soft cable for coal mining machine

Abstract

The present invention discloses a coal mining machine optical fiber composite rubber sheathed soft cable, which relates to the technical field of cables, and comprises a cable core and an impact-resistant shielding layer, an inner sheath, a reinforcement layer, an outer sheath, an anti-twist color strip and a permanent concave-convex pressed mark arranged on the outside of the cable core in sequence; the inner sheath, the reinforcement layer, the outer sheath, the anti-twist color strip and the permanent concave-convex pressed mark adopt a one-time molding process. The present invention arranges a reinforcement layer between the inner sheath and the outer sheath, and embeds the anti-twist color strip on the outer side of the outer sheath. The inner sheath, the reinforcement layer, the outer sheath and the anti-twist color strip adopt a continuous one-time molding production process without stopping the machine, so that the reinforcement layer is tightly and firmly embedded between the inner sheath and the outer sheath, effectively improving the tensile strength, torsion resistance, non-delamination and mechanical properties of the cable sheath, and increasing the service life of the cable core.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to an optical fiber composite rubber sheathed soft cable for coal mining machines. Background Art

[0002] As the country vigorously develops intelligent coal mining, the existing metal shielded rubber sheathed soft cables for coal mining machines cannot meet the needs of intelligent coal mining for signal transmission of coal mining faces. However, due to the relatively harsh working environment of coal mining projects, frequent starts and stops, multi-stage speed changes, and high failure rates during use, especially during night operations, optoelectronic composite cables are easily crushed by carrying equipment, and the sheath and insulation layer of the cable are easily damaged and cracked. At the same time, conductors and optical fibers are also very easy to break, resulting in interruption of control equipment signals, short circuits in the lines, insulation breakdown or leakage, and ultimately interruption of operations, causing huge economic losses.

[0003] In addition, because the optical fiber composite rubber sheathed soft cable used in coal mining machines is round, it is affected by the light underground and the lack of reference objects. It is not easy to be found when the cable is twisted. The twisted cable will seriously shorten its service life. In conventional technology, the printing marks on coal mine cables are all printed with ink jet coding. The marks are not resistant to wear. The surface of the cable is easily contaminated by coal dust. After wiping, the cable marks are easily wiped off and are difficult to distinguish, causing great inconvenience to the subsequent cable maintenance and recycling. Summary of the invention

[0004] The object of the present invention is to provide a coal mining machine optical fiber composite rubber sheathed flexible cable to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0006] The present invention provides a coal mining machine optical fiber composite rubber sheathed soft cable, comprising a cable core and an impact-resistant shielding layer, an inner sheath, a reinforcement layer, an outer sheath, an anti-twist mark color strip and a permanent concave-convex pressed mark arranged on the outside of the cable core in sequence;

[0007] The inner sheath, reinforcement layer, outer sheath, anti-twist color strip and permanent concave and convex pressed logo adopt a one-time molding process;

[0008] The impact-resistant shielding layer includes an inner cylindrical spiral structure formed by a reinforcing strip in a spirally wrapped manner on the outside of the cable core, and an outer cylindrical spiral structure formed by a shielding tape in a spirally wrapped manner on the outside of the inner cylindrical spiral structure, a first spiral gap is formed on the inner cylindrical spiral structure, a second spiral gap is formed on the outer cylindrical spiral structure, the outer cylindrical spiral structure is in the first spiral gap, and the outer cylindrical spiral structure can completely cover the first spiral gap.

[0009] Furthermore, in the cross section of the cable, the spiral edge of the outer side surface of the inner cylindrical spiral structure is evenly provided with strip grooves along the circumferential direction; the spiral edge of the inner side surface of the outer cylindrical spiral structure is evenly formed with strip protrusions corresponding to the strip grooves along the circumferential direction.

[0010] Furthermore, the strip-shaped protrusion is formed by bending the shielding belt in the radial direction of the columnar spiral structure, and a through groove with a circular cross-section is formed in the strip-shaped protrusion.

[0011] Furthermore, the cable core includes three power cores, one control core, two communication cores and one optical cable unit, and the power cores, control cores and communication cores are alternately arranged in a ring shape along the center line of the optical cable unit in the radial cross section of the cable.

[0012] Furthermore, the power line core comprises, from outside to inside, a power line core cross-woven from tinned copper wire / nylon fiber, a shielding layer, an EPDM insulation layer and an oxygen-free tinned soft copper conductor;

[0013] The oxygen-free tinned soft copper conductor is made of Category 5 copper wire processed into tinned copper wire of required specifications by annealing and tinning equipment, then bundled into required strands by a wire bundling machine, and finally twisted by a cage-type stranding machine with constant tension.

[0014] Furthermore, the constant tension value of the cage stranding machine is set within the range of 2.5±0.5 kg / m according to the conductor stranding cross-section and length.

[0015] The present invention also provides a method for manufacturing the above-mentioned coal mining machine optical fiber composite rubber sheathed flexible cable, comprising the following steps:

[0016] S1: Pass the formed cable core through two sets of wrapping machines to wrap the impact-resistant shielding layer around the cable core;

[0017] S2: The wire core with the impact-resistant shielding layer obtained in step S1 is passed through the core of a rubber extruder die to extrude an inner sheath;

[0018] S3: the wire core with the inner sheath obtained in step S2 is directly passed through a horizontal braiding machine along the extrusion outlet direction of the rubber extruder to braid a reinforcement layer, the braiding angle control range of the reinforcement layer is set to 45° to 60°, and the braiding pitch ratio of the reinforcement layer is set to 2 to 3;

[0019] S4: the wire core wrapped with the reinforcement layer obtained in step S3 is directly extruded into an outer sheath through a 150-type rubber extruder along the discharge direction of the wire core, and when the outer sheath is extruded, a 30-type rubber extruder is used to extrude an anti-twist mark color strip perpendicular to the cable surface;

[0020] S5: The wire core of the outer sheath obtained in step S4 is passed through a roller press along the discharge direction of the wire core to press the company name, cable model specification, safety mark certificate number, and production date onto the outer sheath;

[0021] S6: Send the cable in step S5 into a vulcanization pipeline for cross-linking and vulcanization.

[0022] Furthermore, the feeding method of the rubber extruder in S2 is cold feeding, and the mold of the rubber extruder is extrusion type.

[0023] Furthermore, in step S6, the vulcanization pipeline is filled with saturated water vapor, and the steam pressure is set to 1.0-1.6 MPa.

[0024] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0025] 1. The present invention arranges a reinforcement layer between the inner sheath and the outer sheath, and embeds an anti-twist mark color strip on the outer side of the outer sheath 5. The inner sheath, the reinforcement layer, the outer sheath and the anti-twist mark color strip adopt a continuous non-stop one-time molding production process. On the one hand, the reinforcement layer is tightly and firmly embedded between the inner sheath and the outer sheath, which effectively improves the tensile strength, torsion resistance, non-delamination and mechanical properties of the cable sheath, avoids the wire core from being pulled and broken by tension, thereby reducing the damage to the insulated power wire core and the control wire core, and prolongs the service life of the cable core. On the other hand, since the manufactured anti-twist mark color strip is embedded in the surface of the outer sheath, the anti-twist mark color strip can be integrated with the outer sheath. During use, the anti-twist mark color strip will not disappear due to wear and frequent twisting, so as to facilitate subsequent cable maintenance and recycling.

[0026] 2. The present invention adopts an inner cylindrical spiral structure as a supporting frame. When an external impact acts on the cable, the inner cylindrical spiral structure can play a supporting and impact-resistant role to prevent the force from acting on the cable core. The cable core can be effectively protected to avoid the cable core being broken by the impact force, thereby reducing the damage to the insulated power core and the control core and increasing the service life of the cable core.

[0027] 3. The conductor produced by the manufacturing method of the oxygen-free tin-plated copper conductor of the present invention has significantly improved bending resistance, and the number of times the conductor can withstand bending is increased from 9,000 times to more than 100,000 times.

[0028] In addition, in order to improve the bending performance of the cable and take into account the impact resistance of the cable, the present invention increases the pitch of the inner cylindrical spiral structure and sets the outer cylindrical spiral structure between the pitches of the inner cylindrical spiral structure to compensate for the impact resistance of the inner cylindrical spiral structure, so that the inner cylindrical spiral structure not only plays a shielding role, but also can decompose the pressure to the inner cylindrical spiral structure through the outer cylindrical spiral structure after the external impact acts on the outer cylindrical spiral structure, thereby effectively protecting the cable core.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0031] Figure 1 It is a schematic diagram of the transverse cross-sectional structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of the impact-resistant shielding layer of the present invention;

[0033] Figure 3 It is a schematic diagram of the end structure of the impact-resistant shielding layer of the present invention;

[0034] Figure 4 It is a schematic diagram of the split structure of the impact-resistant shielding layer of the present invention;

[0035] Figure 5 yes Figure 4 A local structural diagram of the A;

[0036] Figure 6 It is a schematic diagram of the cross-sectional structure of the impact-resistant shielding layer of the present invention;

[0037] Figure 7 yes Figure 6 Schematic diagram of the local structure at location B.

[0038] In the figure:

[0039] 1-cable core; 11-power core; 12-control core; 13-communication core; 14-optical cable unit; 2-impact-resistant shielding layer; 21-inner cylindrical spiral structure; 211-first spiral gap; 212-strip-shaped slot; 22-outer cylindrical spiral structure; 221-second spiral gap; 222-strip-shaped protrusion; 3-inner sheath; 4-reinforcement layer; 5-outer sheath; 6-anti-twist mark color strip. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0041] See also Figure 1-Figure 7 The present invention provides a coal mining machine optical fiber composite rubber sheathed soft cable, comprising a cable core 1 and an impact-resistant shielding layer 2, an inner sheath 3, a reinforcement layer 4, an outer sheath 5, an anti-twist mark color strip 6 and a permanent concave-convex pressed mark which are sequentially arranged outside the cable core 1; the inner sheath 3, the reinforcement layer 4, the outer sheath 5, the anti-twist mark color strip 6 and the permanent concave-convex pressed mark are formed by a one-time molding process.

[0042] The present invention arranges a reinforcement layer 4 between the inner sheath 3 and the outer sheath 5, and embeds an anti-twist mark color strip 6 on the outer side of the outer sheath 5. The inner sheath 3, the reinforcement layer 4, the outer sheath 5 and the anti-twist mark color strip 6 adopt a continuous non-stop one-time molding production process. On the one hand, the reinforcement layer 4 is tightly and firmly embedded between the inner sheath 3 and the outer sheath 5, which effectively improves the tensile strength, torsion resistance, non-delamination and mechanical properties of the cable sheath, avoids the wire core from being pulled and broken by tension, thereby reducing the damage to the insulated power core 11 and the control core 12, and increasing the service life of the cable core 1. On the other hand, since the manufactured anti-twist mark color strip 6 is embedded in the surface of the outer sheath 5, the anti-twist mark color strip 6 can be integrated with the outer sheath 5. During use, the anti-twist mark color strip 6 will not disappear due to wear and frequent twisting, so as to facilitate subsequent cable maintenance and recycling.

[0043] like Figure 2 and Figure 4 As shown, the impact-resistant shielding layer 2 includes an inner cylindrical spiral structure 21 formed by a reinforcing strip in a spirally wrapped manner on the outer side of the cable core 1, and an outer cylindrical spiral structure 22 formed by a shielding tape in a spirally wrapped manner on the outer side of the inner cylindrical spiral structure 21, a first spiral gap 211 is formed on the inner cylindrical spiral structure 21, a second spiral gap 221 is formed on the outer cylindrical spiral structure 22, and the outer cylindrical spiral structure 22 is located in the first spiral gap 211; Figure 6 and Figure 7 As shown, the outer cylindrical spiral structure 22 can completely cover the first spiral gap 211 .

[0044] The present invention adopts an inner columnar spiral structure 21 formed by spirally wrapping a reinforcing strip as a supporting frame. When an external impact acts on the cable, the inner columnar spiral structure 21 can play a supporting and impact-resistant role to prevent the force from acting on the cable core 1, and can effectively protect the cable core 1, thereby preventing the cable core 1 from being broken by the impact force, thereby reducing the damage to the insulated power core 11 and the control core 12, and increasing the service life of the cable core 1;

[0045] For the inner cylindrical spiral structure 21, the reinforcing strip can be made of a material with high hardness and not easy to deform, such as a steel strip, to improve its supporting and anti-impact effect. Furthermore, the reinforcing strip can also improve its supporting and anti-impact effect by increasing the thickness of its cross section. Preferably, the thickness of the cross section of the reinforcing strip can be 0.5 cm.

[0046] Since the overall structural strength of the inner cylindrical spiral structure 21 is relatively high and not easily deformed, when the pitch of the inner cylindrical spiral structure 21 is relatively small, the overall bending performance of the cable will be affected, thereby affecting the use of the cable. Therefore, during the cable manufacturing process, that is, during the wrapping process of the inner cylindrical spiral structure 21, the bending performance of the cable can be improved by increasing the pitch of the inner cylindrical spiral structure 21;

[0047] However, due to the increase in the pitch of the inner cylindrical spiral structure 21, the cable will have poor support and impact resistance at the position between the pitches of the inner cylindrical spiral structure 21 (i.e., at the position of the first spiral gap 211 of the inner cylindrical spiral structure 21). For this reason, the present invention arranges an outer cylindrical spiral structure 22 spirally wrapped by a shielding tape between the pitches of the inner cylindrical spiral structure 21 to compensate for the support and impact resistance effect of the inner cylindrical spiral structure 21 at this point, so that the inner cylindrical spiral structure 21 not only plays a shielding role, but also when an external impact acts on the outer cylindrical spiral structure 22, the pressure can be decomposed to the inner cylindrical spiral structure 21 through the outer cylindrical spiral structure 22, thereby effectively protecting the cable core 1.

[0048] Since the outer cylindrical spiral structure 22 is mainly used for shielding, its material is mostly copper, aluminum, etc., and its thickness is very thin. In order to prevent it from being deformed by impact force, in the cross section of the cable, Figure 4 As shown, the spiral edge of the outer side of the inner cylindrical spiral structure 21 is evenly provided with strip-shaped grooves 212 along the circumferential direction; Figure 5 As shown, the spiral edge of the inner side surface of the outer cylindrical spiral structure 22 is uniformly formed with strip-shaped protrusions 222 along the circumferential direction, which are locked in the corresponding strip-shaped locking grooves 212.

[0049] Based on the above design, the present invention evenly arranges strip-shaped protrusions 222 along the circumferential direction on the spiral edge of the inner side surface of the outer cylindrical spiral structure 22. The strip-shaped protrusions 222 can form reinforcing ribs on the spiral edge of the outer cylindrical spiral structure 22. On the one hand, the structural strength of the outer cylindrical spiral structure 22 can be improved. On the other hand, the outer cylindrical spiral structure 22 can cooperate with the strip-shaped groove 212 of the inner cylindrical spiral structure 21 through the strip-shaped protrusions 222, so that when the cable is subjected to torsional force, the torsional force can be decomposed to the inner cylindrical spiral structure 21, so as to improve the torsional resistance of the cable.

[0050] Furthermore, the strip-shaped protrusion 222 is formed by bending the shielding tape in the radial direction of the columnar spiral structure, and a through groove with a circular cross section is formed in the strip-shaped protrusion 222. Based on the above design, the difficulty of the cable manufacturing process can be simplified, that is, it is only necessary to process the shielding tape in advance, and use a stamping device to continuously stamp the shielding tape to form a long tape with uniformly distributed strip-shaped protrusions 222, and then use a wrapping machine to wrap the shielding tape.

[0051] In a specific embodiment of the present invention, the cable core 1 includes three power cores 11, one control core 12, two communication cores 13 and an optical cable unit. The power core 11, the control core 12 and the communication core 13 are arranged alternately in a ring shape along the center line of the optical cable unit in the radial cross-section of the cable.

[0052] In a specific embodiment of the present invention, the power core 11 is provided with three groups, which include, from outside to inside, a power core 11 cross-woven from tinned copper wire / nylon fiber, a shielding layer, an EPDM insulation layer, and an oxygen-free tinned soft copper conductor;

[0053] The method for manufacturing the oxygen-free tinned copper conductor comprises the following steps:

[0054] Step 1: Process the five types of copper wires into tinned copper wires of required specifications through annealing and tinning equipment. The manufacturing method is as described in Table 1 below:

[0055] Table 1 Annealing process of tinned copper wire

[0056] Diameter of single wire (mm) Lower section ℃ Middle ℃ Upper section ℃ Plating furnace temperature ℃ Introduction speed m / min Oven ℃ Fixed die aperture mm 0.24 550±10 545±10 540±10 300±10 150±10 180±10 0.24+0.005 -0.00 0.29 550±10 545±10 540±10 300±10 130±10 180±10 0.29+0.005 -0.00 0.39 560±10 555±10 550±10 300±10 70±10 180±10 0.39+0.005 -0.00 0.51 630±10 625±10 620±10 300±10 40±10 180±10 0.51+0.005 -0.00

[0057] The technical performance indicators of tinned copper wire made by the above manufacturing process shall comply with the requirements of Table 2 below.

[0058] Table 2 Tinned copper wire performance control range

[0059]

[0060] Step 2: Bundle the tinned copper wires described in step 1 into the required strands by a wire bundling machine, and then twist them into oxygen-free tinned soft copper conductors of the required specifications by a constant tension cage stranding machine. The constant tension value is set within the range of 2.5±0.5kg / m according to the conductor stranding cross-section and length.

[0061] The present invention also provides a method for manufacturing a coal mining machine optical fiber composite rubber sheathed flexible cable, comprising the following steps:

[0062] S1: passing the formed cable core 1 through two sets of wrapping machines, and wrapping the impact-resistant shielding layer 2 around the cable core 1;

[0063] S2: The wire core with the impact-resistant shielding layer 2 obtained in step S1 is passed through the core of a rubber extruder die to extrude an inner sheath 3;

[0064] S3: the wire core with the inner sheath 3 obtained in step S2 is directly passed through a horizontal braiding machine along the extrusion outlet direction of the rubber extruder to braid the reinforcement layer 4, the braiding angle control range of the reinforcement layer 4 is set to 45° to 60°, and the braiding section diameter ratio of the reinforcement layer 4 is set to 2 to 3;

[0065] S4: The wire core wrapped with the reinforcement layer 4 obtained in step S3 is directly extruded into an outer sheath 5 through a 150-type rubber extruder along the discharge direction of the wire core, and when the outer sheath 5 is extruded, a 30-type rubber extruder is used to extrude an anti-twist mark color strip 6 perpendicular to the cable surface;

[0066] S5: The wire core of the outer sheath 5 obtained in step S4 is passed through a roller press along the discharge direction of the wire core to press the company name, cable model specification, safety mark certificate number, and production date onto the outer sheath 5;

[0067] S6: Send the cable in step S5 into a vulcanization pipeline for cross-linking and vulcanization.

[0068] In a specific embodiment of the present invention, the feeding method of the rubber extruder in S2 is cold feeding, and the mold of the rubber extruder is extrusion type.

[0069] In a specific embodiment of the present invention, in step S6, the vulcanization pipeline is filled with saturated water vapor, and the steam pressure is set to 1.0-1.6 MPa.

[0070] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coal mining machine optical fiber composite rubber sheathed soft cable, comprising a cable core and an impact-resistant shielding layer, an inner sheath, a reinforcement layer, an outer sheath, an anti-twist color strip and a permanent concave-convex pressed mark arranged on the outside of the cable core in sequence; It is characterized in that The inner sheath, reinforcement layer, outer sheath, anti-twist color strip and permanent concave and convex pressed logo adopt a one-time molding process; The impact-resistant shielding layer comprises an inner cylindrical spiral structure formed by a reinforcing strip in a spirally wrapped manner on the outer side of the cable core, and an outer cylindrical spiral structure formed by a shielding tape in a spirally wrapped manner on the outer side of the inner cylindrical spiral structure, a first spiral gap is formed on the inner cylindrical spiral structure, a second spiral gap is formed on the outer cylindrical spiral structure, the outer cylindrical spiral structure is in the first spiral gap, and the outer cylindrical spiral structure can completely cover the first spiral gap; In the cross section of the cable, the spiral edge of the outer side of the inner cylindrical spiral structure is evenly provided with strip-shaped slots along the circumferential direction; the spiral edge of the inner side of the outer cylindrical spiral structure is evenly formed with strip-shaped protrusions corresponding to the strip-shaped slots along the circumferential direction; The strip-shaped protrusion is formed by bending the shielding belt in the radial direction of the columnar spiral structure, and a through groove with a circular cross section is formed in the strip-shaped protrusion.

2. The optical fiber composite rubber sheathed flexible cable for coal mining machines according to claim 1 is characterized in that: The cable core comprises three power cores, one control core, two communication cores and one optical cable unit. The power cores, control cores and communication cores are alternately arranged in a ring shape along the center line of the optical cable unit in the radial section of the cable.

3. The optical fiber composite rubber sheathed flexible cable for coal mining machines according to claim 2 is characterized in that: The power line core comprises, from outside to inside, a power line core cross-woven by tinned copper wire / nylon fiber, a shielding layer, an EPDM insulation layer and an oxygen-free tinned soft copper conductor; The oxygen-free tinned soft copper conductor is made of Category 5 copper wire processed into tinned copper wire of required specifications by annealing and tinning equipment, then bundled into required strands by a wire bundling machine, and finally twisted by a cage-type stranding machine with constant tension.

4. The optical fiber composite rubber sheathed flexible cable for coal mining machines according to claim 3 is characterized in that: The constant tension value of the cage stranding machine is set within the range of 2.5±0.5kg / m according to the conductor stranding cross-section and length.

5. The optical fiber composite rubber sheathed flexible cable for coal mining machines according to claim 1, characterized in that: The manufacturing method thereof comprises the following steps: S1: Pass the formed cable core through two sets of wrapping machines to wrap the impact-resistant shielding layer on the outside of the cable core; S2: The wire core with the impact-resistant shielding layer obtained in step S1 is passed through the core of a rubber extruder die to extrude an inner sheath; S3: the wire core with the inner sheath obtained in step S2 is directly passed through a horizontal braiding machine along the extrusion outlet direction of the rubber extruder to braid a reinforcement layer, the braiding angle control range of the reinforcement layer is set to 45° to 60°, and the braiding pitch ratio of the reinforcement layer is set to 2 to 3; S4: the wire core wrapped with the reinforcement layer obtained in step S3 is directly extruded into an outer sheath through a 150-type rubber extruder along the discharge direction of the wire core, and when the outer sheath is extruded, a 30-type rubber extruder is used to extrude an anti-twist mark color strip perpendicular to the cable surface; S5: The wire core of the outer sheath obtained in step S4 is passed through a roller press along the discharge direction of the wire core to press the company name, cable model specification, safety mark certificate number, and production date onto the outer sheath; S6: Send the cable in step S5 into a vulcanization pipeline for cross-linking vulcanization.

6. The optical fiber composite rubber sheathed flexible cable for coal mining machines according to claim 5, characterized in that: The feeding method of the rubber extruder in step S2 is cold feeding, and the mold of the rubber extruder is extrusion type.

7. The optical fiber composite rubber sheathed flexible cable for coal mining machines according to claim 6, characterized in that: In step S6, the vulcanization pipeline is filled with saturated water vapor, and the steam pressure is set to 1.0-1.6 MPa.

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