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SAMAG coupling

SAMAG coupling introduction

Merely using a mechanical torque limiter can quickly disconnect the motor from the spindle, thereby eliminating the destructive effects of inertial forces. For ordinary machinery, including conveyor drives, office machines, and various instruments, mechanical torque limiters such as shear pin safety couplings and friction clutches provide good safety protection. However, they still cannot meet the requirements of high-performance equipment such as machine tools. One problem faced is that ordinary clutches and couplings transmit both torque and misalignment to the protected shaft. In special applications, there are some other issues. However, the safety coupling is a new type of mechanical torque limiter that can overcome the aforementioned traditional problems. Safety couplings are most suitable for ensuring that high-speed, high-precision drive units are protected from overload damage. This coupling is not merely a refined version of ordinary torque limiters, but a product specifically designed in cooperation with machine tool manufacturers to meet certain specific requirements. The price of protection devices with safety couplings is also relatively low. When equipping machining centers with this type of protection device, each axis generally costs 750 USD.

SAMAG coupling features

All safety couplings have the following characteristics: 1) No backlash in keyless shaft-hub connections; 2) High torsional rigidity, very low moment of inertia, compact size, and adjustable disengagement torque; 3) Maintains original position after re-engagement; 4) Provides alarm during overload; 5) Available in automatic and non-automatic re-engagement types, with heat resistance (above 260 °C). In addition, certain types of safety couplings can compensate for axial, lateral, and angular shaft misalignments. Some types also feature integrated ball bearings on pulleys and sprockets. These characteristics make safety couplings not only very suitable for machine tool drives, but also for high-performance assembly lines, printing machinery, packaging machinery, etc. The internal-expansion friction safety coupling is a structural type of friction safety coupling. It uses two cylindrical helical springs to press arc-shaped friction plates against an intermediate ring, generating friction between the plates. The magnitude of this friction determines the slipping torque of the coupling. The slipping torque of the coupling is adjusted by replacing the springs. When the transmitted torque exceeds the slipping torque of the Stieber coupling, slippage occurs between the driving and driven sides of the coupling; when the transmitted torque is lower than the slipping torque, there is no relative slippage between the two sides of the coupling, and it automatically returns to normal operation. Under normal operating conditions within the specified range, component replacement is generally not required. With correct use of the AMN type internal-expansion friction safety coupling, impact loads during the start-up of the shaft transmission system can be effectively partially reduced, allowing the machine to accelerate uniformly, while also preventing motor burnout due to overload. It can be used in operating conditions requiring overload safety protection to avoid damage to critical components. The internal-expansion friction safety coupling is a type of flexible safety coupling with elastic elements. It connects two halves of a Stieber coupling with a double-row roller chain. Relative slippage can occur between the sprocket and the friction plates, providing safety protection. The torque is determined by the compression amount of the disc springs. It is suitable for connecting transmission shaft systems with coaxial and parallel axes, has certain capability to compensate for relative misalignment between the two shafts, limits torque, and provides overload protection.

SAMAG coupling applications

The features and applications of safety couplings are analyzed as follows: 1) Wide torque control range and high control precision. Torque is proportional to the excitation current over a fairly wide range, enabling perfect and simplified control of transmitted torque, and it can be used as a linear regulation element. 2) Features constant torque characteristic; torque depends solely on the magnitude of the excitation current and is independent of the relative speed between the driving and driven sides, exhibiting definite torque characteristics where static torque equals dynamic torque. 3) Can transmit a certain torque regardless of slip difference, without shock, vibration, or noise, ensuring smooth operation, making it suitable for occasions with higher operating frequencies. 4) Low power consumption and low control power; residual torque when excitation current is disconnected is very small, offering good disengagement performance. No heating occurs during idling, and torque stability is good, making it suitable for precise control. 5) Simple structure, small volume, and light weight. The magnetic powder is dry and oil-free, making it easy to maintain. The magnetic powder has oxidation resistance, good heat resistance, long service life, and high reliability. By fixing the driven part, the torque becomes a braking torque on the rotating part, thus forming a magnetic powder coupling, which can also serve as a magnetic powder load brake.

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