Cable my3 * 50+1 * 16 mining rubber flexible cable my4 * 50+1 * 16

Cable my3 * 50+1 * 16 mining rubber flexible cable my4 * 50+1 * 16

Mobile flexible cables with rated voltage of 0.66/1.14KV and below
Execution standard: MT818.5-1999
Usage: This product is a series of mining rubber sheathed flexible cables. Suitable for connecting power lines to mobile coal mining units and other equipment with rated voltage of 0.66/1.14KV and below.
Cable my3 * 50+1 * 16 mining rubber flexible cable my4 * 50+1 * 16Working conditions:
The rated voltage Uo/U is 0.38/0.66 and 0.66/1.14KV
The long-term operating temperature of cable conductors is 65 ℃
The minimum bending radius of the cable is 6 times the diameter of the cable
Model name and purpose
MY-0.38/0.66 Mobile rubber sheathed flexible cable for coal mines
Power connection of various underground mobile coal mining equipment with rated voltage of 0.38/0.66KV
MYE-0.38/0.66 Mobile Elastic Flexible Cable for Coal Mines
Power connection of various underground mobile coal mining equipment with rated voltage of 0.38/0.66KV
MYP-0.38/0.66 Mobile Shielded Rubber Jacketed Flexible Cable for Coal Mines
Power connection of various underground mobile coal mining equipment with rated voltage of 0.38/0.66KV
MYPE-0.38/0.66 Mobile Shielded Elastic Flexible Cable for Coal Mines
Power connection of various underground mobile coal mining equipment with rated voltage of 0.38/0.66KV
MYP-0.66/1.14 Mobile shielded rubber sheathed flexible cable for coal mines
Power connection for various underground mobile coal mining equipment with a rated voltage of 0.66/1.44KV
MYPE-0.66/1.14 Mobile Shielded Elastic Flexible Cable for Coal Mines
Power connection for various underground mobile coal mining equipment with a rated voltage of 0.66/1.44KV
Other requirements and test methods shall be executed in accordance with the MT818.5-1999 standard
The insulation resistance between the main cores of cable insulation and between the main cores and the ground wire shall not be less than 100M Ω· km when converted to+20 ℃.
The transition resistance of the main core shielding layer shall not exceed 3k Ω when converted to 20 ℃.
Product standard: MT818.5-1999.
The MYP cable consists of three main cores with insulation shielding and a ground wire wrapped in a semi conductive rubber layer, which is twisted around the semi conductive rubber layer to form a cable.
It is recommended by the manufacturer to use a black chlorinated polyethylene rubber sheath or a thick black chloroprene rubber sheath extruded outside for greater safety.
Conductive core: Made of soft copper wire, its performance complies with GB/T3956-1997.
Insulation: XJ-00A rubber according to GB7594.2-1987 is used.
Core identification: Insulation color separation identification is used, with the main core being red, green, and white.
Ground wire: covered with a semi conductive rubber.
Insulation shielding: Cover the insulation surface with a semi conductive tape.
Cabling: Three main cores and one ground wire are twisted in the right direction around a semi conductive rubber pad core to form a cable.
Sheath: XH-03A rubber according to GB7594.7-1987 is used. The oxygen index of the sheath rubber is ≥ 40.
The flame retardant performance of the finished cable meets the requirements of MT386-1995.
Cable marking: The surface of the cable is printed with the model, voltage, specifications, and manufacturer.

The quality management of wires and cables must be integrated throughout the entire production process. The quality management inspection department should conduct patrol inspections, self inspections by operators, and mutual inspections between upper and lower processes throughout the entire production process. This is an important guarantee and means to ensure product quality and improve the economic efficiency of the enterprise.
1. There are multiple types of production processes and large material flow rates
The manufacturing of wires and cables involves a wide range of processes, from the melting and pressure processing of non-ferrous metals to chemical technologies such as plastics, rubber, and paint; The textile technology of wrapping and weaving fiber materials, to the wrapping of metal materials and the longitudinal wrapping and welding of metal strips, and so on.
The various materials used in the manufacturing of wires and cables are not only diverse in categories, varieties, and specifications, but also in large quantities. Therefore, the dosage, reserve quantity, batch cycle, and batch size of various materials must be determined. At the same time, the decomposition, recycling, reuse, and disposal of waste materials are important aspects of management, and material quota management and conservation work should be emphasized.
In the production of wires and cables, from the entry and storage of raw materials and various auxiliary materials, the flow of semi-finished products in each process to the storage and delivery of products, the material flow is large, and it must be reasonably laid out and dynamically managed.
2. Multiple devices
The manufacturing of wires and cables uses production equipment with the characteristics of the industry's technology to adapt to the structural and performance requirements of cable products, meet the requirements of long continuous and high-speed production, and thus form a series of equipment for cable manufacturing. Such as extruder series, wire drawing machine series, wire twisting machine series, winding machine series, etc.
The manufacturing process and equipment development of wires and cables are closely related and mutually promote each other. New process requirements promote the emergence and development of new equipment; On the other hand, the development of new equipment has also promoted the promotion and application of new processes. Such as wire drawing, annealing, extrusion series line; Equipment such as physical foaming production lines have promoted the development and improvement of wire and cable manufacturing processes, enhancing the product quality and production efficiency of cables.

Basic process flow of cable manufacturing
1. Copper and aluminum monofilament drawing
Copper and aluminum rods commonly used in wires and cables are drawn through one or several stretching molds using a drawing machine at room temperature to reduce their cross-section, increase their length, and improve their strength. Drawing is the first process of various wire and cable companies, and the main process parameter of drawing is mold matching technology.
2. Single wire annealing
Copper and aluminum monofilaments are heated to a certain temperature to improve their toughness and reduce their strength through recrystallization, in order to meet the requirements of wire and cable for conductive cores. The key to annealing process is to prevent oxidation of copper wire
3. Twisting of conductors
In order to improve the flexibility of wires and cables for easy installation, the conductive core is made up of multiple single wires twisted together. From the twisting form of the conductive wire core, it can be divided into regular twisting and irregular twisting. Irregular twisting can be divided into bundle twisting, concentric compound twisting, special twisting, etc.
In order to reduce the occupied area of wires and shrink the geometric dimensions of cables, a compression form is adopted while twisting conductors, transforming ordinary circles into semicircles, sectors, tile shapes, and compressed circles. This type of conductor is mainly used in power cables.
4. Insulation extrusion
Plastic wires and cables mainly use extruded solid insulation layer. The main technical requirements for plastic insulation extrusion are:
4.1. Eccentricity: The deviation value of the extruded insulation thickness is an important indicator of the extrusion process level, and most product structural dimensions and their deviation values are clearly specified in the standard.