Rubber sheathed cable MY4 * 4 *+1 * 2.5 mining cable MY4 * 6+1 * 4

Rubber sheathed cable MY4 * 4 *+1 * 2.5 mining cable MY4 * 6+1 * 4

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.
Working 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.

Rubber sheathed cable MY4 * 4 *+1 * 2.5 mining cable MY4 * 6+1 * 4Process characteristics of manufacturing wire and cable products:
Large length continuous stacking combination production method
The impact of the long continuous stacking combination production method on the production of wires and cables is global and controllable, which involves and affects:
(1) Production process flow and equipment layout
All kinds of equipment in the production workshop must be reasonably discharged according to the required process flow of the product, so that the semi-finished products in each stage can be circulated in sequence. Equipment configuration should consider the balance of production capacity based on different production efficiencies. Some equipment may require the configuration of two or more units in order to balance the production capacity of the production line. Therefore, the reasonable selection and combination of equipment and the layout of production sites must be balanced and comprehensively considered based on the product and production volume.
(2) Production organization management
Production organization management must be scientific, reasonable, meticulous, accurate, and strictly detailed. Operators must strictly follow the process requirements. Any problem in any link will affect the smoothness of the process flow, the quality and delivery of products. Especially for multi-core cables, if a pair of wires or a basic unit is short in length, or if there is a quality issue, the entire cable will not be long enough, resulting in scrap. On the contrary, if a unit is too long, it must be sawed off, causing waste.
(3) Quality Management
The production method of continuous stacking and combination of large lengths can affect the quality of the entire cable if any problem occurs in any link or instant during the production process. The more quality defects occur in the inner layer and are not detected and terminated in a timely manner, the greater the losses caused. Because the production of wires and cables is different from assembled products, they can be disassembled, reassembled, and replaced with other parts; Any quality issue with any component or process of a wire or cable is almost irreparable and irreparable for that cable. The handling afterwards is very negative, either cutting short or downgrading, or scrapping the entire cable. It cannot be disassembled and reinstalled.

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.