Rokee® Customized Steel Lamina Coupling With Intermediate Shaft for Customers, Rokee® is a well-known high-quality supplier of couplings and technical services in China.
As an important branch of high-performance metal flexible couplings, the intermediate shaft steel lamina coupling plays a crucial role in modern industrial transmission systems.
The intermediate shaft steel lamina coupling mainly consists of three core components to form a precision transmission system:
Metal diaphragm group: made of precision laminated 304/316L stainless steel thin plates, each group usually consists of 6-12 diaphragms with a thickness of 0.2-0.5mm. The diaphragm design is divided into two structural forms: linkage type (porous) and integral type (continuous). The linkage type diaphragm achieves flexible connection through precisely distributed bolt holes, while the integral diaphragm adopts a special geometric shape of integral metal ring, which compensates for deviation through its elastic deformation.
Intermediate shaft component: It includes an intermediate shaft body made of high-strength alloy steel and its connecting flanges at both ends. The length of the intermediate shaft can be customized according to actual working conditions (standard range 200-5000mm), and the surface is finely ground and dynamically balanced (usually reaching G2.5 level). The design of the intermediate shaft takes into account the critical speed issue, ensuring that the working speed is below 70% of the critical speed by optimizing the diameter to length ratio.
Connection system: including 12.9 grade high-strength alloy steel bolts (surface treated with Dacromet anti-corrosion), precision washers, and anti loosening nuts. The bolt fitting adopts a transitional fit (H7/k6) to ensure the reliability of torque transmission and facilitate disassembly and assembly. Some high-end models use hydraulic tensioning bolts, with a pre tensioning force control accuracy of ± 2%.
The intermediate shaft steel lamina coupling achieves excellent transmission performance through a triple elastic compensation mechanism:
Torque transmission mechanism: The torque at the driving end is transmitted to the first set of diaphragms through flange connection, then transmitted to the second set of diaphragms through the intermediate shaft, and finally output to the driven end. The diaphragm group produces controllable elastic deformation when transmitting torque, and the deformation amount is usually controlled within 30% of the material yield limit to ensure long-term operation.
Deviation compensation system: Axial compensation: up to ± 15mm, suitable for axial displacement caused by equipment thermal expansion; Radial compensation: usually 0.5-3mm, absorbing installation deviation through the fan-shaped deformation of the diaphragm; Angular compensation: allows for a deviation angle of 0.5 ° -2 °, and the dual membrane design can effectively decompose composite deviations.
Vibration suppression principle: The damping structure formed by multi-layer stainless steel diaphragms can attenuate 30-45% of torsional vibrations, especially for vibration suppression in the 50-500Hz frequency range. The quality spring characteristics of the intermediate shaft itself can further reduce the natural frequency of the system and avoid resonance.
The intermediate shaft steel lamina coupling has significant technical advantages compared to ordinary couplings:
Ultra long distance transmission capability: Through the extension of the intermediate shaft, the transmission distance can reach more than 10 meters (special design can reach up to 20 meters), solving the problem of long-distance transmission for large equipment. The intermediate shaft adopts a variable cross-section design, which reduces weight while ensuring stiffness.
Composite deviation compensation: The dual membrane group design improves the radial and angular compensation capabilities by about 40%. Typical specifications can simultaneously compensate for 2mm radial deviation and 1.5 ° angular deviation, and the stiffness of each direction can be independently designed and optimized.
High speed adaptability: After precise dynamic balancing, the maximum speed can reach 15000rpm (DN value exceeding 3 × 10 ⁶), which is particularly suitable for high-speed applications such as turbomachinery. The intermediate shaft adopts a hollow structure to reduce the rotational mass, and the critical speed is increased by about 35%.
Maintenance free design: The all metal structure does not require lubrication and is made of corrosion-resistant materials (such as 316L stainless steel) that can work in a corrosive environment with a pH of 2-12 for a long time. The design life usually exceeds 100000 hours.
Precision transmission performance: The torsional stiffness can reach 5000-20000Nm/rad, and the return clearance is less than 0.01 °, meeting the high-precision transmission requirements of servo systems.
Safety redundancy design: Some models adopt a dual protection mechanism - when the diaphragm group reaches the fatigue limit, the preset mechanical stop can temporarily maintain torque transmission, providing valuable safety shutdown time for the system.
As a key component of modern industrial transmission, the intermediate shaft steel lamina coupling will continue to promote the development of various large-scale rotating equipment towards higher efficiency and reliability through technological progress. Proper selection, precise installation, and scientific maintenance will maximize its performance advantages, providing a durable and reliable power transmission solution for industrial production.
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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