In the United States, Britain, Japan, and other countries, the investment in power transmission and distribution of power grids is about 1.2 times that of power investment. The distribution network investment is more than double the investment in power transmission grids, while the investment in China's power distribution network is less than half of that in power transmission grids. We believe that under the circumstances that most of the power supply and power transmission line skeletons are basically completed, the focus of China's power investment will gradually shift to the grid intelligence and distribution network construction, and solve historical debts.
The Chinese government and the State Grid Corporation of China attach great importance to the distribution network construction also confirms our view. At the 2013 mid-year working meeting, the State Grid mentioned that the development of distribution network construction is a top priority. The first time the distribution network construction has been upgraded to the highest priority level. The provincial companies in the provinces are formulating the investment plan for 2014 in accordance with the requirements of the State Grid. The focus is on distribution network construction.
Internal demand traction distribution automation investment
Distribution automation is an indispensable part of distribution network construction. According to statistics, in 2012, China's distribution automation coverage rate was less than 15%, while the level of distribution automation in developed countries reached more than 50%. With the new type of power supply and load directly connected to the distribution network, new technical problems and challenges are brought to the safe and stable operation of the distribution network; on the other hand, from the perspective of power supply reliability, the distribution network system in China has a long history. The way to go. The solution to these problems depends on a high level of distribution automation systems. Strengthening the construction of distribution automation is the inherent demand for power grid development.
Investment is expected to exceed 100 billion
According to our estimation, in the next five years, under the most pessimistic circumstances, the practical distribution automation system will be promoted across the country. The overall market size will be around 71.16 billion yuan. The standard type is a neutral assumption and the investment scale will be 118.6 billion yuan; optimistic Under the promotion of integration, the overall investment scale is 177.9 billion yuan. Under the assumption of a neutral investment scale, the average annual investment is 23.72 billion yuan, and the total investment in distribution automation in 2012 is 5.5 billion yuan, and investment growth in the next three years is expected to maintain more than 50%.
Secondary Equipment Enterprises Guide Distribution Network Construction Climax
Since the intelligent transformation of power distribution has relatively high requirements for the system integration capabilities of the corresponding enterprises, large-scale engineering project experience, and hardware and software integration capabilities, only large-scale enterprises that have both primary and secondary equipment and systems for the distribution network can benefit from it. Other companies, such as enterprises that only produce distribution network primary equipment, distribution network secondary equipment and systems, or enterprises that only involve primary distribution network primary equipment, are unlikely to benefit from the large investment in distribution intelligence due to their own level and capabilities. .
Plate rolling is a process of continuous three-point bending of sheet metal using a plate rolling machine. The equipment puts the sheet material between the upper and lower work rolls when rolling. The upper roller is raised and lowered vertically, and the two lower rollers rotate and move horizontally relative to the axis of the upper roller. When the upper roll descends, the plate is plastically deformed and bent between the upper and lower work rolls. The continuous rotation of the bottom roller drives the steel plate to advance and retreat through the friction between the plate and the roller to complete the coiling.
1. Pre-bending. When the plate is rolled, there is a length at both ends of the plate that does not bend because it does not touch the upper roller. It is called the remaining straight edge. In the process, the minimum force arm at which the plate starts to bend is called the theoretical remaining straight edge. The bending form (symmetrical bending, asymmetrical bending) is related.
2. Centering. The purpose of centering is to make the generatrix of the workpiece parallel to the roller axis to prevent skew.
3. Roll round. Rolling is the main process of product forming, which is divided into two types: one-time feed and multiple feeds. Multiple feeds are commonly used for rolling thick plates. The number of feeds depends on the technological constraints (such as the maximum allowable deformation during cold rolling) and equipment constraints (such as non-slip conditions and power conditions). When the rebound of the cold coil is significant, a certain amount of overcoiling must be added.
4. Straightening round. The purpose of rounding is to make the curvature of the entire circle as uniform as possible to ensure product quality. The general rounding process is divided into three steps:
(1) Load: According to experience or calculation, adjust the work roll to the position of the required maximum correction curvature.
(2) Rounding: Roll the roller 1 to 2 turns under the corrected curvature to make the entire curling rate uniform.
(3) Unloading: gradually unload the load, so that the workpiece is rolled several times under the gradually reduced correction load.
Rolling Machine,Three-Roller Bending Machine,Four-Roller Bending Machine,Roll Forming Machine
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