Shanghai Machine Tool Plant successfully developed a super-heavy precision CNC roll grinder capable of top grinding 250 tons of workpiece

Abstract One of the major national science and technology projects undertaken and developed by Shanghai Machine Tool Works Co., Ltd., the world's largest "250K55000/5000-H super heavy-duty precision CNC roll grinder"

One of the major national science and technology projects undertaken and developed by Shanghai Machine Tool Works Co., Ltd., the world's largest "MKA84250/ 15000-H super heavy-duty precision CNC roll grinder" capable of top grinding 250 tons of workpieces, through the user Shanghai Heavy Machinery Plant The final acceptance of the company has reached the world's advanced and leading level. Its successful development marks that the R&D and manufacturing of China's ultra-heavy precision CNC roll grinder has entered the world's advanced ranks, and it has also laid an important foundation for the replacement of imports with similar machine tools and localization and industrialization. It is reported that the project will be accepted in advance by the national major special project management department.

With the rapid development of the domestic steel industry in recent years, the demand for rolls has increased dramatically, but the key grinding machines and their manufacturing enterprises for large roll manufacturing are very rare. At present, there are only a handful of machine tool manufacturers in China that have the ability to manufacture roll grinders, and it is difficult to meet the requirements of the steel industry in terms of specifications, performance and precision. Internationally, only manufacturers in Germany, Italy and other countries can produce high-precision heavy-duty CNC roll grinders, the largest workpiece can be ground for 150 tons, and the price is very expensive, the price is generally more than 50 million yuan.

Shanghai Machine Tool Works Co., Ltd. has a CNC roll grinder with a load of less than 80 tons. It has been mass-produced. The large-scale CNC roll grinder MK84200, which has been developed in recent years and can grind 100 tons of workpieces, has also been delivered to users. The performance accuracy is stable. The company develops heavy-duty CNC roll grinders. Has accumulated a wealth of experience. This time, the MKA84250/15000-H super heavy-duty precision CNC roll grinder developed for Shanghai Heavy Machinery Co., Ltd. has a maximum grinding diameter of φ2.5m, an effective grinding workpiece length of 15m, and a maximum workpiece weight of 250 tons. The roundness is 0.003 mm and the surface roughness of the workpiece is 0.4 μm. The overall machine tool is at the international advanced level, especially the parameters such as the largest top grinding workpiece have reached the international leading level, filling the gap in the domestic super-high precision CNC roller grinding machine. The utility model solves the problem that the manufacturing capability of the domestic wide and thick plate supporting roller is insufficient, and at the same time can realize other functions such as grinding of the low-pressure rotor of the large-sized steam turbine.

The innovation of MKA84250/15000-H ultra-heavy precision CNC roll grinder is that it can meet the top grinding process of 250 tons of heavy-duty rolls, that is, the workpiece is supported on the top of both ends for grinding, achieving a maximum weight of 250 tons and a maximum diameter of 2.5m. High-precision grinding of rolls up to 15m in length ensures high-precision rotation. This structure integrates the highest level of precision manufacturing design technology and processing technology in China. The large-scale high-precision online measuring device breaks through the technical difficulties of how to solve the high-precision absolute size measurement of large-scale rotating parts. In addition, the innovative design of the wheel frame structure design of the heavy-duty roll grinder, the in-machine precision measurement of large rolls, the refinement technology of large ultra-precision bearings, and the high-performance headstock structure design ensure the overall accuracy of the machine tool.

As a major national science and technology project, the “super heavy-duty precision CNC roll grinder” project and its technology are suitable for the development of China's steel industry, meeting the needs of shipbuilding for large-scale steel plate rolling, and can be further used for large-scale crankshaft grinding machines for ships. The development of large-scale grinding machines is of great significance to promote the development of China's equipment manufacturing industry and related key industries.

Everyone knows how important the fill is to a Cooling Tower`s performance. Since fill is the heat transfer medium around which the [box" that is the cooling tower is built, you could argue that it`s the most important factor in determining just how well your cooling tower performs. However, since the nozzles are tasked with getting the hot water that you want to cool delivered to the fill, the nozzles also play a very important part in the duty of a tower. Nozzles are involved in the following aspects of a cooling tower`s performance evaluation.


The Advantages of Cooling  tower nozzles:

1) Nozzles are grommeted for easy inspection and removal;

2) Multiple sizes are available to accommodate all system flow rates;

3) Large orifice mearns non-clogging performace for effective wetting of the heat-transfer surface.

Cooling Tower Nozzles

Cooling Tower Nozzles,Marley Cooling Tower ,Cooling Tower Parts ,Marley Cooling Tower Parts

Shandong Hiking International Commerce Group Co.,Ltd , http://www.hikingfrp.com