In the process of use, the local bending radius of the shearer cable is far smaller than the bending radius of the standard cable, and the cable is frequently subjected to the combined effects of excessive bending and stretching and more than two stress, plus the control of the cross section of the core conductor. It is much smaller than the conductor cross section of the main cable core of the cable, causing the core of the control core to break.
Jack is one of the most simple lifting equipment with lifting height of less than 1 m, using jacking rigidity as a working device, through the top bracket or hold claw in the schedule at the bottom of the light and small lifting heavy lifting equipment.Divide into two kinds, mechanical and hydraulic jack is mainly used in mines, transportation and other departments as vehicle repair and other lifting, support, etc.The structure light and strong, flexible and reliable, one man can carry and operation.
Jack is divided into mechanical jacks and hydraulic jack, principle is different. In principle, the principle of hydraulic jack is based on PASCAL's principle, namely: the liquid pressure is the same everywhere, so, in a balanced system, the smaller piston top pressure is small, and the big pressure on the piston is bigger, it can keep the liquid stationary. Through liquid, so can be different on the different pressure, so that you can achieve the goal of a transformation.We are common to the hydraulic jack is to use the principle to achieve the force transfer.Mechanical jacks, using mechanical principle, in the past after pull (handle, claw namely rotary driving ratchet clearance, pull small bevel gear drive big bevel gear, make weight lifting screw rotation, so that the lifting socket for lifting or falling, and achieve the function of the lifting force. But not as easy hydraulic jack.
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1. Increase the flexibility of shearer cables used in coal mines;
2. Increase the relative slippage of the control wire core;
3. Increase the strength of shearer cable conductors for coal mines;
4, the conductor from the original bundle of twisted structure was changed to a normal twisted, so that it can increase its bending performance, and then wire braided outside the conductor, and increase its strength;
5, the control core can use tinned copper wire and wire braid weaving, is also a good method.
August 23, 2024