Glass steel chimney is defined by the special winding machine, formed by winding a certain control technology, for 300MW and above the level of coal-fired units using large diameter (more than 5.0m) glass steel chimney, glass steel chimney and splicing, which is formed by the combination of.
1. workers who wish to do good must first sharpen their tools.
In order to produce high-quality high-quality glass steel chimney, no mechanical facilities, can only be a disappointment!
According to the definition of universally acknowledged, winding machine glass steel chimney must have the following function modules: control mechanism, glass fiber winding line mechanism, dipping and tension control mechanism, glass steel mould, demoulding mechanism with chimney winding etc..
In these institutions, glass steel chimney winding mould is a key factor to determine the FRP chimney section machining quality, mold design and processing quality, directly related to the intrinsic quality of demolding dimensional stability, glass steel chimney section convenience and FRP chimney section.
2. domestic glass fiber reinforced plastic chimney mold development process brief introduction
Before 2010, the domestic glass steel chimney winding mould, or by simple, like the spokes of a wheel supporting frame, covering the surface of a plastic or glass plate, simple mold made of the stripping process is as follows: the mold through the ground rail launch processing workshop, then mold disintegration, FRP chimney section and re release mold assembly. Winding method is also horizontal, vertical two kinds. Because the winding process of vertical winding machine has higher technical requirements for operators, a little attention will be paid to the phenomenon of flowing glue, which will affect the quality of products. Therefore, the use of vertical winding machines in the previous stage is limited.
The following are mainly about horizontal winding machine made in china.
By this kind of simple wound die stiffness is very poor, every time after the release of matching quality is difficult to control, the end of the FRP chimney section size stability in processed is very poor, the glass steel chimney section showing the wave shape and appearance quality of FRP chimney section processing out of the poor:
About 2010 years later, the domestic FRP chimney winding mold has a number of improvements, mainly to enhance the overall rigidity of the mold, glass fiber reinforced plastic chimney section of the quality of processing has been guaranteed.
However, this improvement has led to the emergence of a new problem: difficulty in demoulding! Glass fiber reinforced plastic chimney processing company has to adopt the way of pulling out by lifting power. This "strong external force" method of release is likely to cause the inner cylinder of glass fiber not solidified and completely damaged!
3. introduction of FRP chimney processing equipment in the United States
In the United States, glass fiber reinforced plastic chimney manufacturers are not many, the main equipment has horizontal, vertical two kinds, of which the horizontal mold as shown below, left, shown below, right for the vertical winding machine release:
4. European FRP chimney winding equipment
Europe's representative FRP chimney winding equipment for horizontal winding, vertical demoulding processing methods, the mold is also used all metal and high stiffness design, processing size is very stable, the overall quality is very good. However, the supporting equipment is very complex, and a full set of equipment needs several containers to be shipped:
It is said that the equipment has been introduced into the domestic market (whether it is a comprehensive introduction or a simplified version, which is still unknown) It is going to face competition with domestic equipment and domestic FRP chimney processing technology.
This set of glass steel chimney winding equipment has a set of winding and demoulding process video, about 800M, the summer of 2009 and the factory technical personnel exchanges obtained, currently seen in the set of data, are then began to spread.
5. brief introduction of FRP chimney winding equipment in Japan
From the current data, the Japanese FRP chimney is mainly horizontal winding machine for processing, and its machining accuracy is very high, glass fiber reinforced plastic chimney section diameter tolerance can reach 4 ~ 6mm grade:
Because the glass steel chimney in Japan, one part is for existing concrete chimney with all internal self-supporting glass steel tube, with a concave groove socket type connector, if the error is too large, as shown in the installation is not normal:
In Japan, there is also the application of vertical winding machine, the mold and the processing schematic as shown below, the characteristics of vertical winding machine is similar with the United States, with a glass steel chimney winding mould short, winding FRP chimney long (with the vertical FRP chimney winding machine is similar):
The wall of FRP chimney shall be composed of anti-corrosion lining layer, structural layer and outer surface layer. The design shall comply with the following requirements:
1) anticorrosion lining layer by layer and the second lining resin rich layer, resin rich layer thickness should not be less than 0.25 mm, should adopt the surface of glass fiber mat, the resin content should not be less than 85% (WT), also can choose organic synthetic fiber materials; secondary lining should be used glass fiber chopped mat or jet yarn, its thickness should be not less than 2 mm, the resin content should not be less than 70% (WT). When the lining of anti electrostatic treatment, using conductive carbon fiber or carbon conductive filler, the inner surface of the continuous surface resistivity is less than 1 * 106 Omega, electrostatic discharge device on resistance less than 25 ohm.
2) anti corrosion of inner and outer layer of high resin content, strength and low modulus, in the calculation of structural strength and bearing capacity, are not considered. In addition, the elastic modulus of FRP is low, so it is necessary to define the deflection. At the same time, the wall structure of FRP chimney is required in mechanical design