With the continuous improvement of coal mining technology, modern coal mining projects require that the ground control center be able to grasp the operation status of the underground coal mining machine in time, that is, the coal mining machine cable is required to ensure the normal operation of coal mining equipment under harsh natural working conditions. In the process, the working conditions of the coal mining equipment can be fed back to the ground control center in a timely and effective manner, so that the ground control center can make quick judgments and decisions. Therefore, it is required in the coal industry standard MT818 that a control core is set in the coal mining machine cable to ensure signal detection and transmission, and realize online real-time monitoring.
At present, the disadvantages of coal mining unit cables in the domestic market are mainly reflected in the poor signal transmission of the cable operation or the inability to transmit the signals, which affects the ground control center to monitor the working conditions of the coal mining machine. The main reasons for this situation are as follows: point:
　　1. The working environment of the shearer cable is relatively harsh. The coal gangue or large coal block in the work area falls and smashes the cable, causing the cable sheath to be smashed and even the internal core of the cable will be broken;
　　 2. A certain amount of coal gangue or coal is accumulated in the cable trough, causing the cable to scrape against it during the movement, causing the cable sheath to be scratched or even squeeze the internal core;
　　 3. The shearer cable is frequently stretched and bent during on-site use, and it is also very easy to cause broken cores.
The above three points are all the shearer cables are subjected to various external forces during the coal mining process, resulting in cable failures caused by the cables being easily smashed and broken. This greatly shortens the service life of the shearer cables and cannot ensure their Safety and reliability during use; the detection models and control signals on the intelligent coal mining machine cannot be transmitted in time, and online real-time detection and monitoring cannot be realized.
In order to improve the reliability of the shearer cable, it is necessary to solve the problem of core breakage of the shearer cable during operation. Under the premise of the standard MT818-2009, based on my many years of experience in shearer cable technology , The following improvement measures are proposed to effectively improve the reliability of the cable.
　　 1. The power core and control core conductor monofilament of the shearer cable must ensure uniform elongation, tensile strength, and electrical resistance. The conductor must be twisted to ensure uniform tension. The purpose is to ensure that the cable does not suffer from uneven stress on the monofilament or strand due to uneven conductor elongation or uneven tension during twisting during work, and then breaks. For monofilaments, the production equipment is best to use The multi-end wire drawing machine produced by Niehofer can ensure that the electrical performance of each single wire is basically the same, and its mechanical properties are also consistent.
2. When the power core and control core of the shearer cable are formed into a cable, an unvulcanized rubber filler strip should be added to ensure that the rubber strip is fully filled in the middle of the cable core when the sheath is extruded, so that the cable is frequently bent during work. , Minimize the sliding damage between each other during stretching. In order to protect the control wire core, it is necessary to squeeze a sheath outside the control wire core. When the power core and the control core are formed into a cable, it can be designed as a four-core cable structure to ensure the stability of the overall structure and performance of the cable;
3. The working environment of the shearer cable is harsh. In order to avoid the cable being smashed or cut, the sheath needs to have good tear resistance and compression resistance. Therefore, inner and outer sheaths can be used, and high-strength The dipped fiber rope is braided and strengthened. During the construction and laying process, we can start from the following two aspects: in order to prevent coal gangue or large coal from falling and smashing the cable, advanced protective measures can be taken, namely: advanced support for the coal bank and roof of the mining face, and Adopt the following machine moving frame and mutual help arc top management; the cable can be given a 1% length allowance during the laying and installation process to prevent the cable from being stretched too tightly, thereby effectively improving the reliability of the cable.
Shearer cables need to follow the national coal industry standards and design a reasonable cable structure on this basis to ensure the stable performance of the cable structure, avoid core breakage and other faults during the use of the cable, and ensure the normal operation of the cable in a reasonable and efficient manner. Effective service life. Through the continuous optimization of the product structure, the company will improve the economic benefits of the company while establishing the reputation of the brand cable, so as to be a high-quality cable manufacturer.