3D Printing (3DP) is a kind of Rapid Prototyping technology, which is a kind of technology to construct objects by layer-by-layer printing based on digital model files by using powdery metal or plastic and other adhesive materials.
3D printing is usually realized by digital technology material printer.It is often used in mold manufacturing, industrial design and other fields to make models, and then gradually used in the direct manufacturing of some products. There are already parts printed by this technology.The technology is used in jewelry, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms and other fields.
3D Printing 3D Printing,3D Printing Service,3D Printing Prototype,3D Plastic Printing Prototype Chongqing Jin Te Rui Machine Co.,Ltd , https://www.die-casting-machine.com
2. Who is the end customer for the fixture? The final use of the units, the State Grid Corporation of China and China Southern Power Grid Corporation, the provinces and cities of the power grid and power companies, overseas users.
3, how to sell gold fittings to end customers - circulation links? Direct payments to us are our customers, but only one final customer. Manufacturers of metal fittings -> Manufacturers of end customer's fittings -> Agents/Traders -> Manufacturers of end customers' fittings -> Agents/Traders -> Contractors -> End customers 4. Power generation, transmission and transformation The relationship between electricity and power distribution? Electricity from thermal power stations, hydropower stations, nuclear power stations, etc. is sent to the grid and then distributed to users by the grid. Because the distance between the power plant and the user is far away, the energy must be lost in the process of transmission, which is called line loss. The line loss is proportional to the square of the current. When the transmission power is fixed, the current and voltage are inversely proportional to each other. If the voltage is increased, the current can be reduced and the line loss can be greatly reduced. Therefore, the power plant uses a step-up transformer to boost the voltage and then send power to the grid. The farther the transmission distance is, the higher the voltage level is. After the energy is delivered to the user, if it is used without being depressurized, the user must use a power equipment with a high withstand voltage level, which not only increases the cost of the equipment, but also increases the voltage and threatens personal safety. Therefore, use it after lowering the voltage. This step-up and step-down process is substation, long-distance, high-voltage transmission of electricity, known as transmission. The substation near the user reduces the voltage, and distribution to the user is a short-distance, low-voltage transmission. This process can be called power distribution. In short, the power plant sends out electric energy via a booster substation to an overhead cable for long-distance transmission. After reaching the city or destination, it is stepped down to the distribution voltage by a step-down substation and distributed to end-users. The end-users are transformed to small- The transformer on the utility pole) is used after the voltage is reduced to the final use voltage level.
5. What does the entire power system look like? What are the main equipment? In power generation: three main engines such as thermal power plants, boilers, steam turbines and generator sets, hydropower turbines,
Nuclear reactors and other major equipment. In the transmission and transformation links: mainly transformer equipment, such as transformers, transmission equipment, such as large cross-section conductors, towers, insulators and fittings. Distribution: Small bare wires and insulated conductors, utility poles, low-voltage transformers, various small distribution boxes and meters and fittings, etc., characterized by low voltage, such as the common 220V civil circuit, 380V factory power.
6. How to distinguish and regulate the voltage level of transmission power. There are no particularly strict standards, and as the voltage level of the line becomes higher and higher, the distinction of the voltage level also changes. At present, generally speaking, the voltages of 35kV, 110kV, 220kV, and 330kV are high; 500kV, 660kV, and 750kV are super. High pressure; 800kV, 1000kV is UHV.
12, how to determine the voltage level from the number of insulators? Voltage (kV)10351102203305007508001000 Insulator Number 13~47~814~1621~2230~3239~4060~7952~54
7. What is the single circuit or double circuit in the transmission line? A circuit with a power supply having a load is a single circuit; a circuit with a load having two power supplies is a dual circuit.
8. What are the telephone poles and towers in the transmission lines? The transmission line towers are generally divided into: cup type, cat head type, upper type, dry type and barrel type. They are divided into four types according to their use: tension tower, straight line tower, corner tower, transposition tower (replacement wire) Phase position tower), terminal tower, and spanning tower, etc. Their structural characteristics are that all tower types are space truss structures. The rods are mainly composed of a single equilateral angle steel or a combination of angle steels. The materials generally use Q235 (A3F) and Q345. (16Mn) Two types, the connection between rods adopts crude bolts, and the bolts are connected by shear force. The whole tower consists of angle steel, connecting steel plates and bolts. Individual parts such as tower feet are welded by several steel plates into one assembly. As the name implies, poles are the poles of the wires. Appeared in various rural-field-road-streets, it is one of the important infrastructures in early China. Generally wood, steel rods, reinforced concrete rods.
9. What is the corner (strand) of the transmission line? On the transmission line, there is a corner on the turn. Because it is a string of gold fittings hanging on the tower, it is also called the tension tower.
16. What is a straight (hanging) tower (bar) for transmission lines? In the transmission line, there is no corner on the straight line, because hanging on the tower is a hanging string of gold, so it is also called an overhanging tower.
10. What is the single split or double split of the line? One wire of a set of wires is a single split, and two wires are double split.
Optical Cable Description
Gold 1, what is the fittings? Equipment and conductors, conductors and wires in transmission equipment of step-up substations and step-down substations, the connection of the transmission line conductors themselves and the insulators are connected in series, and the accessories used for the protection of the conductors and insulators are called as hardware. .