Rokee® Customized Metallurgical Steel Rolling Universal Joint Coupling for Customers, Rokee® is a well-known high-quality supplier of couplings and technical services in China.
As a key transmission component in metallurgical rolling equipment, universal joint couplings undertake the important mission of connecting different axes, transmitting huge torque, and compensating for complex deviations. During high-speed rolling, this type of coupling needs to withstand dynamic torque of up to 10000N · m, while compensating for axial, radial, and angular deviations caused by thermal deformation and mechanical vibration. The special working conditions of the metallurgical industry have put forward strict requirements for couplings: they must be able to work stably in harsh environments such as high temperature (up to 280 ℃), high dust, and heavy load impact, and have anti fatigue, wear-resistant, and long-life characteristics.
The universal joint couplings used in metallurgical rolling are mainly divided into three types: cross shaft type, ball cage type, and double coupling type, each of which is suitable for different working conditions. The cross axis universal joint coupling has become the preferred choice for heavy-duty equipment such as hot rolling mills and medium thick plate mills due to its simple structure and strong load-bearing capacity. Its typical structure consists of two universal joint forks, a cross axis, and bearings, which achieve angular deflection through the rotation of the cross axis. The cage type universal joint, with the advantage of constant speed transmission, is gradually being applied to cold rolling and precision rolling units that require higher motion accuracy. Its core technology lies in the precise coordination between steel balls and raceways to ensure constant instantaneous angular velocity. The double universal joint eliminates the speed fluctuation problem of a single universal joint through the special design of the intermediate shaft, making it an ideal choice for the main drive of large rolling mills.
The core component material of metallurgical universal joint couplings directly determines the performance boundary of the product. Cross shafts are generally made of high-quality alloy steels such as 20CrMnTi and 20CrNi2Mo. After carburizing and quenching treatment, the surface hardness reaches HRC58-62, and the core maintains the toughness of HRC35-40, ensuring both wear resistance and impact resistance requirements. The universal joint fork is mostly made of 42CrMo or 35CrMo, and the best comprehensive mechanical properties are obtained through quenching and tempering heat treatment.
The lubrication system of metallurgical universal joint couplings has undergone technological upgrades from grease lubrication to oil lubrication, and then to intelligent lubrication. Although traditional grease lubrication has a simple structure, it is difficult to meet the heat dissipation requirements under high-speed and heavy load conditions; The circulating oil lubrication system effectively reduces operating temperature through forced oil cooling, but increases equipment complexity and maintenance costs.
The efficient and stable operation of metallurgical rolling equipment relies on the precise selection of universal joint couplings. Scientific selection requires comprehensive consideration of five core elements: torque characteristics, speed range, compensation capability, environmental adaptability, and maintenance convenience. The rated torque should be selected as the basic parameter based on 1.5-2 times the maximum working torque of the equipment, while considering the dynamic impact load during the rolling process.
The scientific maintenance system of metallurgical universal joint couplings is a key guarantee for ensuring their long-term stable operation. An effective maintenance strategy should combine the three elements of condition monitoring, regular maintenance, and predictive maintenance.
Over the years, with excellent quality, we have been continuously providing many coupling products of various categories and uses complying with multiple standards and a full range of services, from the product selection to final installation and operation, for the industry fields of ferrous metallurgy, nuclear power, gas turbine, wind power, ropeway construction, lifting transportation, general equipment, etc. We strictly comply with quality system requirements and implement the whole process control to become a reliable and trustworthy partner of customers.
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