The lifting tool is mainly used for carrying pieces of goods. It can be used to transport bulk materials such as coal, ore and grain after being equipped with grabs. It can be used to transport liquid materials such as molten steel after being filled with barrels. Some lifting tools such as elevators can also be used to carry people. In some applications, lifting equipment is also the main working tool, such as cranes that load and unload materials at ports and stations.
Lifting tool classification
Lifting tools can be divided into light and small lifting equipment, hoist and overhead monorail system according to different structures. Light and small lifting equipment mainly includes lifting blocks, spreaders, jacks, chain hoists, electric hoists and ordinary winches. Most of them are small in size, light in weight and easy to use. Except for electric hoists, most of them are driven by human power and are suitable for occasions where work is not heavy.
Use of lifting tools
They can be used alone or in combination. Some light and small lifting equipment have a large lifting capacity, such as the hydraulic jack has a lifting capacity of 750 tons. Mine hoists and hopper elevators are mainly used for vertical or near vertical lifting movements with a fixed lifting path. The overhead monorail system has lines formed by rigid hanging rails that can transport materials to various parts of the plant or to the exterior of the plant.
15-25mm Calcium Carbide: Physical and chemical properties: ores are solid brown or black block, pure white crystals (including CaC2 higher purple). Density of 2.22 g / cubic centimeter, the melting point of 2300 ° C (with CaC2 content), water immediately intense reaction to generate acetylene, and release heat, Calcium Carbide content varies with the melting point also will change.
Impurities: Caustic soda often contain calcium arsenide (Ca3As2), calcium phosphide (Ca3P2) and other impurities, and the role of water at the same time release arsine (AsH3), phosphine (PH3) and other toxic gases, so the use of Acetylene generated by calcium carbide is toxic.
Crystal structure
The most common crystal form of CaC2 is tetragonal, stable between 298K and 720K. Quartet CaC2 similar to the crystal structure of NaCl, but due to [: C≡C:] 2- ion oval, oriented, the crystal is tetragonal. In CaC2 crystal, the C-C distance is 120pm, which corresponds to the bond length of carbon-carbon triple bond, the distance between Ca and C is 259 and 282pm.
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