This product is composed of trapezoidal copper bars and channel steel, or formed by combining "T" type copper busbars with channel aluminum. It is supported by high-strength special insulators. This product has the following characteristics: 4. The current-carrying capacity can be set according to user needs, with a maximum of over 3000A, and the voltage level can reach above 5KV. 5. Using copper or copper-aluminum conductors can significantly reduce the conductor; after adding auxiliary cables, it can form a low-impedance sliding line. The conductor and wiring can be arranged at the upper or lower part for sliding contact. 8. The JGH-"I" type sliding contact line has advantages such as a particularly large heat dissipation surface, compact and simple structure, and convenient installation and maintenance. The sliding contact line is divided into single-line type and double-line parallel feed type. Except for the double-line parallel type, which is represented by JGH-□II, the single-line type is not additionally annotated. Its cross-section is as follows: Model JDG-I JDG-II Rated Current (A) 600 1200 Contact Pressure (kg) 6±2 10±2 Voltage (V) 600 600-3000 Slider Material Powder Alloy Powder Alloy 4. The connection of the steel sliding contact line: The size of the reserved gap is related to the ambient temperature during installation. Generally, a higher value is taken for winter installation, and a lower value for summer installation. The method for calculating the load current of the sliding contact line previously used a binomial formula. Now, the calculation method commonly used in foreign materials is introduced as follows: Based on the rated current of motors that may operate simultaneously on the crane, multiplied by the duty cycle factor and the simultaneity factor of multiple cranes. Load current (I) = Rated current of all working motors (1H) × Duty cycle factor (FED) × Simultaneity factor (F). The FED duty cycle factor is determined according to the table below: (For multiple cranes working simultaneously, the simultaneity factor F is taken as 0.4-0.7). In the past, when designing sliding contact lines, the maximum current was used to check the voltage drop. That is, from the feeder shape on the low-voltage panel to the end of the sliding contact line, the voltage drop including the power supply cable must not exceed 12%. That is, the sliding contact line and the power supply line are considered as a whole, and while meeting the voltage drop requirements, the investment should be minimized. With the increase in imported projects in recent years, and based on comprehensive foreign materials, foreign countries generally use the load calculation current to check the voltage drop. The voltage drop from the power supply line to the end of the sliding line, including the power supply line, must not exceed 5%. Voltage calculation formula: √3 × I × I × (RCOSρ + XSin) Where: u = voltage drop (V), I = load calculation current (A), R = resistance (Ω/km), X = inductance (Ω/km), Z = impedance (Ω/km), L = length of the sliding contact line (m). In modern industry, the tonnage of cranes is increasing, and the operating distance is also getting longer, which needs to be properly solved during the design process. In the past, methods to solve excessive voltage drop were limited to: increasing the cross-section of the sliding contact line and power supply line; increasing the number of power supply points on the sliding contact line; reducing the phase-to-phase distance between the three sliding contact lines, etc. However, these measures often have little effect or are uneconomical because the reactance value in the sliding contact line is difficult to reduce. Therefore, the first step is to solve how to reduce the reactance value on the sliding contact line. Our factory, together with relevant design units, has studied foreign materials. Based on the rigid sliding contact line, adding two auxiliary cables to form a low-impedance sliding contact line can reduce the line impedance value by multiples (depending on the specification of the rigid body and the cross-section of the added cables, the impedance value can be reduced to 1/2 to 1/3 of the original). Below is a brief configuration diagram of the low-impedance sliding contact line: Main products include: safety sliding contact lines, aluminum-based power busbars, cable trays, busway, cable drag chains, rubber-sheathed flat cables, and many other products. The sliding line series features a novel integrated design that achieves a gap-free and firm connection between the conductor and insulating material. Using new materials and new processes, it has higher corrosion resistance, acid resistance, and a wider operating temperature range, making it safer and more reliable. The new formula alloy copper brush has low hardness and high wear resistance, does not wear its mating parts, and has excellent characteristics of long service life. Broad application fields: mobile power supply and control systems for cranes, assembly lines, and material handling systems in metallurgy, mining, construction, transportation, chemical industry, energy, machinery manufacturing, light industry, pharmaceuticals, textiles, etc., such as steel plants, shipyards, vehicle factories, automobile manufacturing plants, railways, airports, ports and docks, warehouses, freight yards, bridges, subways, light rail, home appliance manufacturing, papermaking, sugar refining, breweries, power plants, chemical plants, water plants, amusement parks, etc. all use such products. 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