CN203150161U - Composite cable for coal mining machines - Google Patents

Abstract

The utility model discloses a composite cable for coal mining machines. The composite cable comprises three power wire core conductors and three ground wire core conductors, wherein each of the three power wire core conductors is sequentially coated with an ethylene-propylene rubber insulation layer and a semi-conductive shielding layer, each of the three ground wire core conductors is coated with a semi-conductive wrapping layer, the three power wire core conductors coated with the semi-conductive shielding layers and three ground wire core conductors coated with the semi-conductive wrapping layers are vertically placed in parallel in a '3+3' symmetrical structure to form a cable core, the cable core is wrapped by an inner sheath layer, the inner sheath layer is wrapped by a shielding layer, an isolating layer and an outer sheath layer in sequence, and three control wire cores distributed in the shape of a triangle are arranged between the isolating layer and the outer sheath layer. The composite cable for coal mining machines is reasonable in structural design, is applicable to the connection of frequency conversion equipment of coal mining machines in coal mines and has the characteristics of high flame retardancy, oil resistance, abrasion resistance, high tear resistance, high interference resistance, small outer diameter, not-easy-to-break control wire cores, high external shock resistance, stable speed control, flexibility and mobility.

Description

Composite cable for coal mining machine

Technical field:

The utility model relates to a mine cable, in particular to a composite cable for a coal mining machine.

Background technique:

As we all know, my country's coal industry can be called the first energy industry in my country. It is not only a large production capacity, but also a large energy consumer, and it is also a large energy-saving potential. Energy conservation is a basic national policy of our country. In order to save energy, coal mines have begun to use frequency conversion motor drives on coal mining machines, which requires the use of flame-retardant frequency conversion cables for coal mining machines. The frequency conversion cables used on coal mining machines are different from ordinary frequency conversion cables. Different, ordinary frequency conversion cables are composed of power cores and ground cores, plus a shielding layer. The shearer flame-retardant frequency conversion cable used in the coal mine, in addition to the ordinary frequency conversion cable structure, must also have a control core in its core to facilitate the control of the shearer equipment.

Everyone knows that the power core transmits strong current, and the control core transmits weak current. They are combined together, especially as a variable frequency motor with a wide modulation frequency, the high-order harmonics of the cable interfere with the control core is very serious. Moreover, during the use of the coal mine cable for the coal mining machine, its control wire core is also very easy to break.

Utility model content:

In order to make up for the existing technical problems, the purpose of this utility model is to provide a composite cable for a shearer, which is suitable for the connection of shearer frequency conversion equipment in coal mines, and has high flame resistance, oil resistance, wear resistance, high tear resistance, high Anti-interference, small outer diameter, not easy to break the control wire core, high resistance to external impact, stable speed control, soft and easy to move, especially suitable for the use of variable frequency motor equipment for shearers below coal mines.

The technical scheme of the utility model is as follows:

A composite cable for a coal mining machine, comprising three power core conductors and three ground core conductors, is characterized in that: the three power core conductors are respectively coated with an ethylene-propylene rubber insulating layer and a semi-conductive shielding layer in sequence; The three ground core conductors described above are covered with a semiconductive wrapping layer, and the three power core conductors covered with a semiconductive shielding layer and the three ground core conductors covered with a semiconductive wrapping layer have a 3+3 symmetrical structure The cable core is formed by parallel vertical placement, and the cable core is covered with an inner sheath layer, and a semi-conductive rubber is arranged between the inner sheath layer and the cable core to form a filling layer, and the inner sheath layer is provided with a shielding layer, an isolation layer, The outer sheath layer, three control wire cores distributed in the shape of a finished product are arranged between the isolation layer and the outer sheath layer.

The composite cable for coal shearer is characterized in that: the shielding layer is made of aluminum-plastic composite tape plus tinned copper wire braiding.

The composite cable for coal shearer is characterized in that: the material used for the inner sheath layer and the isolation layer is high flame-retardant chloroprene rubber.

The composite cable for coal shearer is characterized in that: the outer sheath layer is made of neoprene with high flame retardancy, oil resistance and high tear resistance.

The composite cable for coal shearer is characterized in that: the control wire core is made of tinned copper wire twisted into bundles.

The utility model has the advantages of:

1. The three control wire cores are loosely wound with small pitches outside the cable core. In this way, during the bending process of the cable, the conductors of the control wire cores are continuous, and the bending performance is good, and the bending radius is small. The three control insulated wire cores of ordinary coal shearers are twisted into a single unit, and then twisted with other power wire cores. Since the cross section of the control wire core conductor is relatively small compared with the power wire core conductor cross section, it cannot withstand the bending process. Repeated bending will easily break the core, causing damage to the cable or even scrapping it.

2. The control wire core is placed outside the shielding layer of the cable core. Since the transmission frequency of the cable power core is different, different harmonics will be generated during the frequency conversion process, and the harmonics will interfere with the control wire core. When the control wire core of the coal mining machine cable is disturbed, it will often produce malfunctions, resulting in various problems in the coal mining machine. If the control wire core is placed outside the cable core shielding layer, the control wire core will not be disturbed by the power wire core during frequency conversion, and its anti-interference performance is high.

3. The control wire core adopts a bare wire conductor, and the outside is not extruded for insulation. The outside of the control cable core of an ordinary coal mining machine must be extruded with fluoroplastic insulation to prevent the wire core from being broken. The fluoroplastic extrusion equipment is a high-temperature extrusion equipment. Different from ordinary rubber production equipment, it must be specially equipped, otherwise it will not be able to produce fluorine plastic insulated cores, and it will not be able to produce shearer cables. However, this product uses bare wire conductors, which are not extruded for insulation, and do not need to be equipped with special fluorine. Plastic high-temperature extrusion equipment saves labor and time, high efficiency, and low cost. Its bare wire conductors are wrapped with small pitches outside the cable core, which has the advantages of good bending performance, not easy to break, and long service life, which greatly improves coal mining. machine control system security.

4. The cable of this utility model adopts composite shielding of aluminum foil and tinned copper wire, and its braiding density is not less than 85%. At the same time, the nominal cross section of the total shielding layer must be ≥ 10% of the nominal cross section of the conductor of the main core of each phase. Increase the shielding coverage area, speed up the speed of the shielding layer induced current entering the ground, reduce the interference caused by the current penetrating into the shielding layer, reduce the multiple reflection interference electromagnetic field, and reduce the frequency change and frequency wave distortion of the input cable and cable output. Small size, which improves the frequency conversion synchronization at both ends of the frequency conversion cable and the authenticity of transmission, and reduces the interference of the cable to the outside.

5. The 3+3 symmetrical structure can homogenize the electric field inside the cable, improve the balance of the electromagnetic field of the three-phase power core, and reduce the even and odd waves in the high-order harmonics, thereby reducing the radiation hazard of high-order harmonics .

Description of drawings:

Fig. 1 is the structural representation of the utility model.

Detailed ways:

See Figure 1:

Composite cable for coal shearer, including three power core conductors 1, three ground core conductors 2, the three power core conductors 1 are respectively coated with ethylene propylene rubber insulation layer 3, semi-conductive shielding layer 4; three ground wires The core conductors 2 are covered with a semiconductive wrapping layer 5 respectively, and the three power line core conductors 1 covered with the semiconductive shielding layer 4 are symmetrical with the three ground line core conductors 2 covered with the semiconductive wrapping layer 5 The structure is parallel and longitudinally placed to form a cable core. The cable core is covered with an inner sheath layer 6. A semi-conductive rubber is provided between the inner sheath layer 6 and the cable core to form a filling layer 7. The inner sheath layer 6 is sequentially provided with a shielding layer. Layer 8, isolation layer 9, outer sheath layer 10, three control wire cores 11 distributed in the form of a finished product are arranged between the isolation layer 9 and the outer sheath layer 10.

The shielding layer 8 is made of aluminum-plastic composite tape plus tinned copper wire weaving.

The inner sheath layer 6 and the isolation layer 9 are made of high flame-retardant chloroprene rubber.

The outer sheath layer 10 is made of neoprene with high flame retardancy, oil resistance and high tear resistance.

The control wire core 11 is formed by twisting tinned copper wires into bundles.

Claims (5)

1. a coal-winning machine composite cable comprises three power line core conductors, three ground wire core conductors, it is characterized in that: described three power line core conductors are coated with ethylene propylene rubber insulated layer, semiconductive shielding layer outward respectively successively; Described three ground wire core conductors are coated with the semiconductive lapping layer outward respectively, three power line core conductors that coat semiconductive shielding layer are put the formation cable core with three ground wire core conductors that coat the semiconductive lapping layer with parallel the indulging of 3+3 symmetrical structure, cable core is coated with inner restrictive coating, be provided with semi-conductive rubber between inner restrictive coating and the cable core and constitute packed layer, inner restrictive coating is provided with screen, separator, external sheath layer outward successively, is provided with three control cores that distribute in a triangle between separator and the external sheath layer.

2. coal-winning machine composite cable according to claim 1 is characterized in that: described screen adopts aluminium-plastic tape to add the braiding of tin-coated copper copper wire to constitute.

3. coal-winning machine composite cable according to claim 1 is characterized in that: it is the high flame retardant neoprene that described inner restrictive coating, separator adopt material.

4. coal-winning machine composite cable according to claim 1 is characterized in that: it is high flame retardant, oil resistant, high anti-tear neoprene that described external sheath layer adopts material.

5. coal-winning machine composite cable according to claim 1 is characterized in that: the stranded bunchy formation of described control core employing tinned copper wire.

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