Galvanized Steel Conductor Trolley Line
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Mobile equipment needs to constantly change positions due to movement, and at each different position, the mobile equipment must be able to obtain power supply at any time, otherwise it cannot continue moving. At this point, the trolley line came into being. Several conductors are laid parallel along the running track of the mobile equipment to connect the power supply. On the mobile equipment, a
current collector that can draw power from the conductors is installed. In this way, when the equipment moves, the current collector moves synchronously with the equipment and obtains power from the conductors at any time to supply the equipment, allowing it to continue moving. The device composed of these conductors and the current collector is called a trolley line.
The power supply trolley line device consists of three main components: the protective sleeve, the conductor, and the current collector, as well as some auxiliary components.
1.
Protective sleeve: It is a semi-enclosed tubular component and the main part of the trolley line. Inside, 3-16 bare guide rails can be embedded as power supply conductors as needed, and each guide rail is insulated from each other to ensure the safety of power supply. It also effectively prevents electric shock accidents for maintenance personnel during live maintenance. The length of each duct produced by the manufacturer varies, and they can be connected to any required length. Ordinary ducts are made in straight shapes, and can also be made into arc shapes according to special requirements.
2. Conductor: The main material is copper, and according to its cross-sectional area, the common ones are 10 square millimeters, 16 square millimeters, and 25 square millimeters.
3. The current collector is a set of brush frames that run inside the duct. It is driven by a fork (or traction chain, etc.) installed on the electrical mechanism (such as a crane, trolley, electric hoist, etc.), making it move synchronously with the electrical mechanism. It transmits the electrical energy from the guide rails and brushes to the motor or other control elements. The number of poles of the current collector brushes ranges from 3 to 16, corresponding to the number of poles of the guide rails in the duct.
(2) Product Characteristics
1. Safety: The shell of the power supply trolley line is made of engineering plastic with high insulation performance. The shell protection level can reach IP13 and IP55 as needed, which can protect against rain, snow, and freezing attacks, as well as contact with hanging objects. The product withstands various environmental condition tests. It has good insulation performance and causes no harm to maintenance personnel who touch the outside of the power transmission duct.
2. Reliability: The power transmission guide rail has excellent conductivity, fast heat dissipation, high current density, low impedance, and low line loss. The brushes are made of metal graphite material with high conductivity and high wear resistance. The current collector moves flexibly, has good directional performance, and effectively controls contact arcs and series arcs.
3. Economy: The power supply trolley line device has a simple structure, using copper busbars with high current density, low resistivity, and low voltage loss as the main conductive body. It can save about 6% of electricity, achieve the substitution of plastic for steel and copper, has a novel design, requires no additional insulation structure, no compensation wires, and is installed on the same side as the crane control room, saving installation materials and costs. Its comprehensive cost is roughly the same as that of bare steel trolley lines.
4. Convenience: The power supply trolley line device integrates multiple levels of busbars into one duct, making assembly simple. Its fixing brackets, connecting clamps, and suspension devices are supplied as universal parts, and installation, disassembly, adjustment, and maintenance are also very convenient.
(3) Applications:
The power supply trolley line device can be used for electric hoists, electric beam cranes, and electric single-girder bridge cranes; stackers, automatic inspection lines for electromechanical products, automated production lines, mobile electric tools, and other mobile power-receiving equipment, as well as fixed busway installations in factories, mines, workshops, and office areas.
Single-pole H-type safety trolley lines are commonly used, with significant improvements in protection level and insulation, making them safe and reliable.
Safety trolley lines —— used in dusty, humid environments, can be equipped with dust-proof sealing strips and hand protection (when the trolley line is very close to people, hand protection should be provided, such as akapp). The current collector speed is less than 300 meters/minute.
Multi-pole trolley lines —— easy to install, fast speed, simple and compact structure, safe and reliable, suitable for currents below 100A commonly used.
Rigid trolley lines —— used for high-current equipment, with currents up to several thousand amperes, suitable for harsh environments and high temperatures.
Single-pole trolley lines —— combined according to different numbers of poles, with currents also up to a thousand amperes, are the most commonly used trolley lines.
The quality of trolley lines can be measured according to the following standards:
1. Carbon brush service life -- it is a consumable item, and the travel distance affects the equipment maintenance cycle.
2. Trolley line shell quality -- thickness, hardness, applicable temperature, environment, etc.
3. Current collector performance -- mainly considered from the service life of the wheels, the design of turning wheels, and whether the current collector can be used in various environments.
4. Trolley line expansion issue -- expansion must be considered when the length exceeds 100 meters.
5. Voltage drop issue -- the voltage drop varies according to the length of various copper bars.
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.
