Chemical companies emerge in the top 500 Chinese companies
China Drying Network News In the 2012 China Enterprise Top 500 Release and China Large Enterprise Summit, the China Enterprise Confederation and the China Entrepreneurs Association released the list of top 500 Chinese companies for the 11th time in a row. Energy and chemical companies performed well. The top 500 entry-level threshold for operating income was 17.51 ​​billion yuan, an increase of 23.3% over the previous year. The Fortune 500 achieved a total net profit of 2.1 trillion yuan. Among them, Sinopec topped the list with operating revenue of 255.2 billion yuan, ranking the top 500 for eight consecutive years; PetroChina ranked second with 238.13 billion yuan; CNOOC ranked tenth with 488.2 billion yuan. In addition, the top 100 energy and chemical companies also include Sinochem, Henan Coal, China Chemical, Shaanxi Yanchang Petroleum, China Pingmei Shenma and others. Hoisting Mechanism And Spare Parts
The hoisting mechanism for a Tower Crane typically consists of a combination of a motor, a gearbox, wire ropes, and a hook block. Here is a breakdown of its components and how they work together:
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1. Motor: The hoisting motor provides the power needed to lift and lower loads. It is usually an electric motor that generates high torque to handle heavy loads.
2. Gearbox: The motor's rotational motion is transmitted to the hoisting drum through a gearbox. The gearbox helps increase the torque and reduce the speed of the motor, enabling the crane to lift heavy loads at a controlled speed.
3. Hoisting Drum: The hoisting drum is a cylindrical drum around which the wire ropes are wound. It is directly connected to the gearbox and rotates as the motor operates. The drum's size and design determine the amount of Wire Rope it can hold.
4. Wire Ropes:
The wire ropes are wound around the hoisting drum and connected to the hook block. These ropes are made of high-strength steel and have a high load-bearing capacity. Multiple wire ropes are used to distribute the load evenly and ensure stability during lifting operations.
5. Hook Block: The hook block is attached to the lower end of the wire ropes and is responsible for carrying the load. It consists of a pulley system with one or more sheaves, which allows the wire ropes to change direction and support the load securely.
During operation, the motor drives the hoisting drum through the gearbox. As the drum rotates, the wire ropes are wound or unwound, depending on the direction of rotation. This movement raises or lowers the hook block, allowing the crane to lift or lower loads.
The hoisting mechanism is controlled by the crane operator using various controls and switches. Safety features such as limit switches and overload protection systems are also incorporated to prevent accidents and ensure safe lifting operations.