Coiled drag cable and production process for aboveground mining engineering

Abstract

The present invention discloses a winding and dragging cable for ground mining engineering, the main points of which are: comprising a main core, a monitoring core, a center filling and an outer sheath. The braided shielding layer is composed of a braided conductor as a strand of braided wire and nylon yarn, which are compositely braided outside the main core insulation layer. The braided conductor is formed by twisting metal monofilaments. A semi-conductive nylon tape is wrapped around the braided shielding layer to form a wrapped shielding layer. The monitoring core is provided with a monitoring core conductor and a monitoring core insulation layer in sequence from the inside to the outside along its radial direction. The monitoring core conductor is formed by twisting a nylon rope and a conductor. The center filling adopts a saddle-shaped core pad, and the saddle-shaped core pad adopts a semi-conductive rubber or chloroprene rubber material to be extruded outside the monitoring core. The center filling and three main cores are twisted into a cable. The outer sheath adopts a chloroprene rubber material to be extruded outside the three main cores and the center filling that are twisted into a cable.

Description

Technical Field

[0001] The invention relates to the technical field of power cables, in particular to a winding and dragging cable for ground mining engineering and a production process. Background Art

[0002] At present, with the continuous improvement of the mechanization and automation of coal mines, electrical control technology is of great significance in coal mine production. Due to the complexity of the operating conditions, the winding and dragging cables used in ground mining projects are in a moving and bending state for a long time, so the mechanical life of the cables is very short, usually 6-10 months. Moreover, as mining cables, port machinery cables and other cables that need to be moved frequently for a long time, saddle-type gaskets are installed in the cables to avoid damage caused by friction between the cores. In the production process of cables, how to ensure that the saddle-type gasket and each twisted unit are fixed in position is the most critical. Summary of the invention

[0003] The purpose of the present invention is to provide a winding and dragging cable for ground mining engineering which has a simple structure and is conducive to extending the service life and a production process.

[0004] The basic technical scheme for achieving the purpose of the present invention is: a winding and dragging cable for ground mining engineering, which has the following structural features: including a main core, a monitoring core, a center filler and an outer sheath. There are three main cores. The three main cores have the same structure, and are all provided with a main core conductor, a main core insulation layer and a shielding layer in sequence from the inside to the outside along their respective radial directions. The main core insulation layer is extruded by ethylene propylene rubber outside the main core conductor. The shielding layer includes a braided shielding layer and a wrapped shielding layer.

[0005] The braided shielding layer is composed of a braided conductor as a strand of braided wire and nylon yarn, which is braided outside the insulation layer of the main line core. The braided conductor is made of twisted metal monofilaments. The semi-conductive nylon tape is wrapped around the braided shielding layer to form a wrapped shielding layer.

[0006] The monitoring wire core is provided with a monitoring wire core conductor and a monitoring wire core insulation layer in sequence from the inside to the outside along its radial direction. The monitoring wire core conductor is formed by twisting a nylon rope and a conductor.

[0007] The center filling adopts saddle core pad, which is made of semi-conductive rubber or chloroprene rubber material and is extruded outside the monitoring line core. The center filling and 3 main line cores are twisted into a cable.

[0008] The outer sheath is made of neoprene material extruded over the three main cores and the center filler of the twisted cable.

[0009] The technical solution based on the above basic technical solution is: the braided conductor of the braided shielding layer is formed by twisting 7 0.25 mm metal monofilaments.

[0010] The technical solution based on the above corresponding technical solutions is: the nylon yarn of the braided shielding layer is made of 2 / 240D.

[0011] The technical solution based on the above corresponding technical solutions is: the monitoring line core conductor is composed of 1 nylon rope and 4 conductors twisted together, the twisting ratio of the monitoring line core conductor is 8 times, and 1 nylon rope is arranged in 4 conductors using a 1+4 structure.

[0012] The technical solution based on the above-mentioned corresponding technical solutions is: the four conductors of the monitoring line core conductor are all twisted by six tinned copper wires. The nylon rope is made of 3 / 5 / 210D nylon wire, that is, one strand of nylon rope is twisted by five 210D nylon wires, and three strands are twisted to form the nylon rope.

[0013] The technical solution based on the above corresponding technical solutions is: the surface of the monitoring wire core is coated with talcum powder.

[0014] The technical solution based on the above-mentioned corresponding technical solutions is: the monitoring wire core insulation layer is made of ethylene propylene rubber with a hardness of 60A to 80A by continuous vulcanization.

[0015] A production process for a coiled drag cable for ground mining engineering comprises the following steps:

[0016] 1) Twist and re-twist several tinned copper wires to form the main core conductor.

[0017] 2) The EPDM rubber is extruded onto the outside of the main line core conductor by an extruder to form the main line core insulation layer, and then the EPDM rubber of the main line core insulation layer is vulcanized by a vulcanizing device.

[0018] 3) The braided conductor is used as one strand of the braided wire and is compositely woven together with the nylon yarn outside the insulation layer of the main line core to form a braided shielding layer.

[0019] 4) The semi-conductive nylon tape is wrapped around the braided shielding layer to form a wrapped shielding layer.

[0020] 5) The core conductor of the monitoring line is made of 1 nylon rope and 4 conductors twisted together. When twisting, the nylon rope at the center of the pay-off tension is greater than the conductor, and its extension under tension is controlled within 3%. The conductor is made of 6 0.2mm tinned copper wires twisted together. The 4 conductors adopt a 4 / 6 / 0.2 twisted structure, that is, each conductor is twisted with 6 0.2mm tinned copper wires, and then 4 strands are twisted together. The twisted pitch ratio during twisting is 8 times. The nylon rope adopts 3 / 5 / 210D, that is, each nylon rope is twisted with 5 210D nylon wires, and then 3 strands are twisted to form a nylon rope. When the 4 conductors are twisted together, they are placed in the center of the 4 conductors in a 1+4 structure. Ethylene propylene rubber is extruded outside the core conductor of the monitoring line, and then continuously vulcanized to form the insulation layer of the monitoring line core.

[0021] 6) Extrude semi-conductive rubber or neoprene material onto the monitoring wire core to form a saddle-shaped cushion core, thereby making a center fill. Before extrusion, apply talcum powder on the surface of the monitoring wire core.

[0022] The saddle-shaped cushion core is made by tank-type vulcanization equipment or horizontal dry-drying pipeline. A large amount of talcum powder should be put in the cooling water trough during extrusion to ensure that the surface of the saddle-shaped cushion core is fully adhered to the talcum powder.

[0023] 7) Use a cage-type cabling machine to twist the three main cores and the center filler. While the main cores are rotating during the cabling process, the feeding device of the saddle-shaped core pad of the center filler rotates synchronously with the rotation direction of the cage to ensure that each arc surface of the saddle-shaped core pad fits the surface of the corresponding main core.

[0024] 8) Extrude the neoprene material around the three main wire cores and the center filler of the twisted cable to form an outer sheath.

[0025] The technical solution based on the above corresponding technical solution is: in step 3):

[0026] 3.1) The braided conductor is made of 7 0.25mm metal monofilaments twisted together. The braided wire is woven with 2 / 240D nylon yarn and a corresponding 7 / 0.25 braided conductor.

[0027] 3.2) The braided conductor is welded as a whole. The single strands in each ingot must be welded at a distance of at least 3mm. The overall replacement distance of the ingot should not be less than 1m.

[0028] The technical solution based on the above corresponding technical solutions is: in step 7):

[0029] The feeding end and the discharging end of the central hollow tube of the feeding device of the saddle core pad are respectively provided with a first positioning mold and a second positioning mold. The saddle core pad is guided by the first positioning mold and the second positioning mold so that it is coaxial with the cage-type cabling machine when entering the cage-type cabling machine.

[0030] The first positioning mold is in the shape of a disk, and a wire through hole corresponding to the shape of the saddle-shaped core pad is provided in the center along its axial direction and passes through its two ends.

[0031] The second positioning mold is an integral piece, including a cylindrical feeding end and a conical discharging end, and a wire through hole corresponding to the shape of the saddle-shaped core pad is provided in the center along its axial direction and passes through both ends.

[0032] The present invention has the following beneficial effects: (1) The mechanical life of common mining cables in China is generally 6-10 months, while the mechanical life of the winding and dragging cable for ground mining projects using this structure can be increased by at least twice.

[0033] (2) The monitoring line core conductor of the present invention is made of nylon rope and conductor twisted together. When twisting, the nylon rope at the center of the pay-off tension is required to be larger than the conductor strands, and its extension under tension should be controlled within 3%. The conductor adopts a 4 / 6 / 0.2 twisted structure, and the twisted pitch ratio is 8 times. 3 / 5 / 210D nylon rope is selected as a reinforcing element, and is placed in the center of the conductor in a 1+4 structure when the conductor is twisted together. Tests show that nylon wire with an elongation greater than 25% can meet the problem of the conductor being stretched by 15% without breaking.

[0034] (3) The monitoring cable core of the present invention is filled in the center before extrusion and coated with talcum powder on the front surface, so that the cable can bend freely when in use.

[0035] (4) The braided shielding layer of the present invention is braided with nylon yarn as one strand of the parallel wire. After braiding, a layer of semi-conductive nylon tape is wrapped around the braided shielding layer to separate the braided shielding layer from the outer sheath, which is conducive to bending and has good shielding reliability. The braided shielding layer is conducive to improving mechanical strength. The nylon yarn material can enhance the mechanical strength, and the nylon yarn material can also play a role in identifying the wire core because it can be made of different colors.

[0036] (5) Since the outer diameter of the braided conductor of the braided shielding layer is large, the braiding machine coil cannot store a sufficient length of braided conductor, so the braided conductor will be welded. In order to prevent the welding points from being too dense and affecting the strength of the braided layer, the braided wire is welded as a whole. The single strands in each ingot coil must be welded at a distance of at least 3mm. The overall replacement distance of the coil is not less than 1m, so as to ensure that the distance between the conductor joints is not too close to avoid affecting the overall mechanical strength.

[0037] (6) The present invention provides a first positioning mold and a second positioning mold at the feeding end and the discharging end of the central hollow tube at both ends of the feeding device of the saddle-shaped core pad, respectively, and guides the saddle-shaped core pad through the first positioning mold and the second positioning mold so that it is coaxial with the cage-type cabling machine when it enters; the discharging end of the second positioning mold adopts a conical shape so that the saddle-shaped core pad is closer to the cage-type cabling machine when it is discharged, and the positioning is more accurate. When twisting, each arc surface is attached to the surface of the main line core through the mold, and the cabling tension is uniform and good. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of a coiled drag cable for ground mining engineering of the present invention.

[0039] Figure 2 It is a structural schematic diagram of the first positioning mold.

[0040] Figure 3 It is a structural schematic diagram of the second positioning mold.

[0041] Figure 4 For Figure 3 Schematic diagram when viewed from the rear.

[0042] The reference numerals in the accompanying drawings are:

[0043] Main line core 1, main line core conductor 1-1, main line core insulation layer 1-2, shielding layer 1-3, braided shielding layer 1-31, braided conductor 1-31-1, nylon yarn 1-31-2, wrapped shielding layer 1-32,

[0044] Monitoring core 2, monitoring core conductor 2-1, monitoring core insulation layer 2-2,

[0045] Center filling 3, outer sheath 4, first positioning mold 51, second positioning mold 52. DETAILED DESCRIPTION

[0046] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings. Figure 1 The direction shown is carried out, that is, Figure 1 The up, down, left, and right directions shown are the up, down, left, and right directions described. Figure 1 The direction is forward, away from Figure 1 The side that is at the rear is the one at the rear.

[0047] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0048] It should be understood that terms such as "upper", "lower", "inside" and "outside" to indicate directions or positional relationships are based on the positional relationships described in the drawings and are only used to facilitate the description of the present invention or simplify the description, rather than to indicate a specific direction that must be possessed.

[0049] (Example 1)

[0050] See Figure 1 The winding and dragging cable for above-ground mining engineering of the present invention comprises a main core 1, a monitoring core 2, a center filler 3 and an outer sheath 4.

[0051] See Figure 1 There are three main line cores 1, and the three main line cores 1 have the same structure. They are all provided with a main line core conductor 1-1, a main line core insulation layer 1-2 and a shielding layer 1-3 in sequence from the inside to the outside along their respective radial directions.

[0052] The main line core conductor 1-1 is formed by twisting a plurality of tinned copper wire bundles and then re-twisting them. The main line core insulation layer 1-2 is made by continuous vulcanization of ethylene propylene rubber with a hardness of 60A to 80A, and the main line core insulation layer 1-2 is extruded outside the main line core conductor 1-1.

[0053] See Figure 1 The shielding layer 1-3 includes a braided shielding layer 1-31 and a wrapped shielding layer 1-32.

[0054] The braided shielding layer 1-31 is composed of a braided conductor 1-31-1 as one strand of the braided wire and a nylon yarn 1-31-2, which are compositely woven outside the main line core insulation layer 1-2.

[0055] The nylon yarn 1-31-2 is made of 2 / 240D, that is, each nylon yarn is twisted by two 240D nylon filaments.

[0056] The braided conductor 1-31-1 is formed by twisting together 7 0.25 mm metal monofilaments, which in this embodiment are copper monofilaments.

[0057] The semi-conductive nylon tape is wrapped around the braided shielding layer 1-31 to form a wrapped shielding layer 1-32.

[0058] See Figure 1 The monitoring wire core 2 is provided with a monitoring wire core conductor 2-1 and a monitoring wire core insulation layer 2-2 in sequence from the inside to the outside along its radial direction. The monitoring wire core conductor 2-1 is formed by twisting 1 nylon rope and 4 conductors, and the twisting pitch ratio is 8 times. The conductor is twisted by 6 tinned copper wires, and 1 nylon rope is arranged in 4 conductors with a 1+4 structure. The monitoring wire core insulation layer 2-2 is made of ethylene propylene rubber with a hardness of 60A to 80A through continuous vulcanization. The nylon rope is made of 3 / 5 / 210D nylon wire, that is, each nylon rope is twisted by 5 210D nylon wires, and then 3 strands are twisted to form a nylon rope.

[0059] The center filling 3 adopts a saddle core pad. The saddle core pad adopts a semi-conductive rubber or chloroprene rubber material and is squeezed and wrapped outside the monitoring wire core 2, and the surface of the monitoring wire core 2 is coated with talcum powder.

[0060] The center filler 3 and 3 main line cores 1 are twisted into a cable.

[0061] The outer sheath 4 is made of chloroprene rubber material and is extruded around the three main wire cores 1 and the center filling 3 of the twisted cable.

[0062] See Figures 1 to 4 The production process of the winding and dragging cable for ground mining engineering of the present invention comprises the following steps:

[0063] 1) Twist and re-twist several tinned copper wire bundles to form a main line core conductor 1-1.

[0064] 2) The EPDM rubber is extruded onto the main core conductor 1-1 by an extruder to form a main core insulation layer 1-2, and then the EPDM rubber of the main core insulation layer 1-2 is vulcanized by a vulcanizing device.

[0065] 3) The braided conductor 1-31-1 is used as a braided wire and is compositely braided together with the nylon yarn 1-31-2 outside the main line core insulation layer 1-2 to form a braided shielding layer 1-31.

[0066] 3.1) The braided conductor 1-31-1 is formed by twisting 7 metal monofilaments of 0.25 mm, which are copper monofilaments in this embodiment. The braided wire is braided with 2 / 240D nylon yarn and a corresponding 7 / 0.25 braided conductor 1-31-1.

[0067] 3.2) The braided conductor 1-31-1 is welded as a whole. The single strands in each ingot must be welded at a distance of at least 3mm, and the overall replacement distance of the ingot should not be less than 1m.

[0068] 4) The semi-conductive nylon tape is wrapped around the braided shielding layer 1-31 to form a wrapped shielding layer 1-32.

[0069] 5) The monitoring line core conductor 2-1 is made of 1 nylon rope and 4 conductors twisted together. When twisting, the nylon rope at the center of the pay-off tension is greater than the conductor, and its extension under tension is controlled within 3%. The conductor is made of 6 0.2mm tinned copper wires twisted together. The 4 conductors adopt a 4 / 6 / 0.2 twisted structure, that is, each conductor is twisted with 6 0.2mm tinned copper wires, and then 4 strands are twisted together. The twisted pitch ratio during twisting is 8 times. The nylon rope adopts 3 / 5 / 210D, that is, each nylon rope is twisted with 5 210D nylon wires, and then 3 strands are twisted together to form a nylon rope. When the 4 conductors are twisted together, they are placed in the center of the 4 conductors in a 1+4 structure. Ethylene propylene rubber is extruded on the outside of the monitoring line core conductor 2-1, and then continuously vulcanized to form the monitoring line core insulation layer 2-2, thereby making the monitoring line core 2.

[0070] 6) Extruding a semi-conductive rubber or chloroprene rubber material onto the monitoring wire core 2 to form a saddle-shaped cushion core, thereby forming a center filling 3. Before extrusion, talcum powder is coated on the surface of the monitoring wire core 2.

[0071] The saddle-shaped cushion core is made by tank-type vulcanization equipment or horizontal dry-drying pipeline. A large amount of talcum powder should be put in the cooling water trough during extrusion to ensure that the surface of the saddle-shaped cushion core is fully adhered to the talcum powder.

[0072] 7) Use a cage-type cabling machine to twist the three main cores 1 and the center filler 3. While the main cores 1 rotate during cabling, the feeding device of the saddle-shaped core pad of the center filler 3 rotates synchronously with the rotation direction of the cage to ensure that each arc surface of the saddle-shaped core pad fits the surface of the corresponding main core 1.

[0073] The feeding end and the discharging end of the central hollow tube of the feeding device of the saddle core pad are respectively provided with a first positioning mold 51 and a second positioning mold 52. The first positioning mold 51 and the second positioning mold 52 guide the saddle core pad so that it is coaxial with the cage type cabling machine when entering the cage type cabling machine.

[0074] The first positioning mold 51 is in the shape of a disk, and a wire through hole corresponding to the shape of the saddle-shaped core pad is provided in the center along its axial direction and passes through both ends thereof.

[0075] The second positioning mold 52 is an integral piece, including a cylindrical feeding end and a conical discharging end, and a wire through hole corresponding to the shape of the saddle-shaped core pad is provided in the center along its axial direction and passes through both ends. The conical shape of the discharging end can make the saddle-shaped core pad closer to the twisting mold of the cage-type cabling machine when discharging, and the positioning is more precise.

[0076] 8) Extrude the neoprene material onto the three main wire cores 1 and the center filler 3 of the twisted cable to form an outer sheath 4.

[0077] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process for a coiled drag cable for ground mining engineering, characterized in that: The following steps are involved: 1) Twist and re-twist several tinned copper wire bundles to form the main core conductor; 2) The EPDM rubber is extruded on the outside of the main line core conductor by an extruder to form the main line core insulation layer, and then the EPDM rubber of the main line core insulation layer is vulcanized by a vulcanizing device; 3) The braided conductor is used as a strand of the braided wire and is compositely braided with the nylon yarn outside the insulation layer of the main line core to form a braided shielding layer; 3.1) The braided conductor is made of 7 0.25mm metal monofilaments twisted together, and the braided wire is woven with 2 / 240D nylon yarn and a corresponding 7 / 0.25 braided conductor; 3.2) The braided conductor is welded as a whole. The single strands in each ingot must be welded at a distance of at least 3mm. The overall replacement distance of the ingot should not be less than 1m. 4) The semi-conductive nylon tape is wrapped around the braided shielding layer to form a wrapped shielding layer; 5) The core conductor of the monitoring line is made of 1 nylon rope and 4 conductors twisted together. When twisting, the nylon rope at the center of the pay-off tension is greater than the conductor, and its extension under tension is controlled within 3%; the conductor is made of 6 0.2mm tinned copper wires twisted together; the 4 conductors adopt a 4 / 6 / 0.2 twisted structure, that is, each conductor is twisted with 6 0.2mm tinned copper wires, and then 4 strands are twisted together. The twisted pitch ratio during twisting is 8 times. The nylon rope adopts 3 / 5 / 210D, that is, each nylon rope is twisted with 5 210D nylon wires, and then 3 strands are twisted together to form a nylon rope. When the 4 conductors are twisted together, they are placed in the center of the 4 conductors in a 1+4 structure; EPDM rubber is extruded outside the core conductor of the monitoring line, and then continuously vulcanized to form the insulation layer of the monitoring line core; 6) Extrude semi-conductive rubber or chloroprene rubber material onto the monitoring wire core to form a saddle-shaped cushion core, thereby forming a center filler. Before extrusion, apply talcum powder on the surface of the monitoring wire core; The saddle-shaped cushion core is made by tank-type vulcanization equipment or horizontal dry drying pipeline. A large amount of talcum powder should be put into the cooling water tank during extrusion to make the talcum powder fully adhere to the surface of the saddle-shaped cushion core. 7) Use a cage-type cabling machine to twist the three main cores and the center filling. When the main cores rotate during cabling, the feeding device of the saddle-shaped core of the center filling rotates synchronously with the rotation direction of the cage to ensure that each arc surface of the saddle-shaped core fits the surface of the corresponding main core; the feeding end and the discharging end of the central hollow tube at both ends of the feeding device of the saddle-shaped core are respectively provided with a first positioning mold and a second positioning mold; the saddle-shaped core is guided by the first positioning mold and the second positioning mold so that it is coaxial with the cage-type cabling machine when entering the cage-type cabling machine; The first positioning mold is in the shape of a disk, and a wire through hole corresponding to the shape of the saddle-shaped pad core is provided in the center along its axial direction and passes through both ends thereof; The second positioning mold is an integral part, including a cylindrical feeding end and a conical discharging end, and a wire through hole corresponding to the shape of the saddle-shaped pad core is provided in the center along its axial direction. 8) Extrude the neoprene material around the three main wire cores and the center filler of the twisted cable to form an outer sheath.

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