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Wire rope structure used for imported rotary drilling rigs abroad

Rotary drilling rigs are construction machinery imported from Germany, Italy, Japan, Singapore and other countries after the 1980s in my country. Its introduction has driven the rapid development of my country's pile foundation engineering and its machinery, and has formed an independent industry category.
Rotary drilling rigs have undergone practical improvement and technical upgrades of related companies in my country, making my country quickly become the most used and widely used country in the world, and at the same time it has become the world's largest producer of such construction machinery. After more than ten years of development, this pile foundation machinery has been transformed into one of my country's important export machinery products.
Regardless of how the domestic rotary drilling rig type is updated and how the rotary drilling rig capacity is increased, the author believes that: analyzing the structure and specifications of the steel wire rope randomly used when the rotary drilling rig was introduced is helpful for analyzing and understanding the original intention of the foreign designer and the selection of the steel wire rope The reason is helpful to promote the scientific development and selection of the steel wire rope structure, especially the steel wire rope for the main hoist of the rotary drilling rig.
For the wire rope structure used in the original foreign machine, the author made the same revision as the domestic expression method.
2.1 German BG series rotary drill rig
The structure of the steel wire rope used in this machine is 18×7 (7×7)/(7x
7) 7×7 SE (8 8 1) 0.
China Railway No.14 BAUER Group Road and Bridge Equipment Leasing Company introduced the main winch calibration wire rope diameter 36mm which is equipped with the original BC40 machine from Germany. The main structure of the steel wire rope is the same as the steel wire rope used in the BG series rotary drilling rig, except that the SE structure of the rope core changes to 0 9 l5; the original machine is equipped with an auxiliary hoisting steel wire rope structure 16×7 (6×7)/(6×
7) 6×7 SE, rope core SE structure l 6 6/6.
The BG25 rotary drilling rig imported from the German BAUER Company of the China Railway 20th BAUER is randomly equipped with a 32mlm DIEPA1318 structure steel wire rope.
The main reason for the low service life of the main hoisting wire rope of the domestic rotary drilling rig is the multi-layer winding of the wire rope. There are also the problems of improper selection of the main hoisting wire rope structure and the need to improve the twisting quality. It is worth paying attention to the production of such wire rope companies.

2.2 Italy B125 rotary drilling rig
China Nonferrous Metals Industry Corporation, Xi'an Geotechnical Engineering Corporation, two B125 rotary drilling rigs imported from Italy in 2000 were randomly equipped with K6×K36SW IWR-25 steel wire rope. A domestic steel wire rope backbone enterprise recommends 6×365W IWRC as a special steel wire rope model for rotary drilling rigs on its company website (in fact, it is a wire rope structure). This kind of structure steel wire rope can be used, but it is the best choice for non-wire rope structure.
2.3 The Japanese Sumitomo SD-205-2 type rotary rig is equipped with 4×F (0 40)-20 steel wire rope for the main winch, and there are also examples of K4xK39S NF-20 steel wire rope; 6×29Fi IWRC for the auxiliary winch -20 wire rope. The four-strand steel wire rope used to be the main steel wire rope used by rotary drilling rigs in domestic construction machinery backbone enterprises. Recently, the number of applications and the scope of the steel wire rope have decreased. The wire rope industry has a view that based on the fact that the four-strand steel wire rope is too few, it is prone to broken strands, and the safety of use is greatly threatened. It is believed that the four-strand steel wire rope should not be used for the rotary drilling rig.
The service life of the 1960MPa grade K4xKSe5(39)-32 steel wire rope produced by the original Qingdao Hanxian Iron and Steel Co., Ltd. on the Sany Heavy Industry SR250 rotary drilling rig exceeds 4000 linear meters (the linear meters are used to count or describe irregular strips or lines) Engineering volume). The steel wire rope samples of imported rotary drilling rigs obtained from different channels were used for the strand splitting test. The analysis revealed that the actual tensile strength of the steel wire rope was l960MPa, and the tensile strength of the inner strand steel wire was slightly higher.
According to the actual working conditions of the rotary drilling rig and the failure analysis of the steel wire rope, it is found that the steel wire rope is mostly replaced due to wear and fatigue broken wire. In order to comprehensively improve the performance and life of the steel wire rope, the tensile strength of the steel wire rope for the rotary drilling rig should not be too high. The focus is to increase the toughness index and improve the stability of the steel wire rope and the ability to resist impact load.
Whether steel wire rope filling and plastic coating will help to improve the physical quality level and actual service life of steel wire ropes. There are no domestic examples. It remains to be discussed by steel wire rope companies in cooperation with users.
China Railway Fifteenth BAUER Group Machinery Equipment Engineering Co., Ltd. BG25 rotary drilling rig selects 40W×7-32.5, right-twist twist, 1870MPa grade important use steel wire rope for the required rigging, one end squeezes the collar, the other end is the heat shrink head, the company The choice is worth learning four.

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