Experts recently said that due to the fact that most of the domestic rotary drilling rig manufacturers have not been established for a long time, despite the rapid rise of some leading enterprises, the industry still has a lot of problems. At present, the disadvantages of domestic rotary drilling rigs are mainly manifested in the following aspects:
First, the homogeneity of products tends to be more serious. Among the more than 20 companies engaged in the manufacture and sale of rotary drilling rigs in China, there are large-scale group companies and professional companies that have long been engaged in the manufacture of basic and exploration equipment. There are also basic construction-based industries that have only entered rotary drilling in recent years. Construction companies in the field of drilling rig manufacturing. Their entry has changed the pattern of the piling machinery industry. But overall, as most companies have entered a relatively short period of time, their products have not yet become large-scale and serialized.
Second, compared with foreign countries, the difference between domestically-made rotary-drilled drills is obvious. First of all, the overall hydraulic system and configuration. Abroad, the high-quality product hydraulic system generally adopts constant power system or load sensing system, and the hydraulic components adopt advanced and mature international products; secondly, the key parts of homemade rotary drilling rigs, such as machine-locked pressurized drill pipe, cannot meet the requirements of the host. The main reason is that the roundness and straightness of domestic steel tubes do not meet the requirements; the quality of processing welding can not be guaranteed, the welding is easy to deform, and the deformation is difficult to adjust.
Third, the actual distribution of domestic rotary drilling rigs and the actual distribution of the market have been severely discontinued. According to statistics, the pile foundation volume of general industry and civil buildings with small pile diameters and shallow depth of pile holes accounts for more than 65% of the total amount of pile foundation projects, while the amount of pile foundations with high bearing capacity for single piles such as bridge piles accounts for only About 30%. However, in domestically produced rotary drilling rigs, the proportion of products with torques of up to 200 kN/m is as high as 75% or more, and the small and medium-sized rotary drilling rigs most suitable for building pile foundations have little market input. As a result, on the one hand, the overwhelming majority of companies are congested and smashed each other in smaller market spaces. On the other hand, markets with large actual demand lack suitable products, and the actual needs of products and markets are severely divorced.
Anti Inflammatory Drugs
Cas 516 12 1,Polymyxin B Sulfate,Anti Inflammatory Drugs,Chitosan Oligosaccharide
Mingya Trading PTE.L , https://www.mingyachem.com