The characteristics of serpentine spring coupling and its selection in belt conveyor

The serpentine spring coupling not only has the function of a flexible coupling that can compensate for the relative deviation of the two shafts, but also has the function of different degrees of shock absorption and buffering of the elastic coupling, and also has the function of maintaining the overload of the coupling, so The use of serpentine spring couplings in belt conveyors used in important occasions can reduce the resonance between the driving device and the working machine, and can also reduce the impact on the tape when starting.

1 Features of serpentine spring coupling

1.1 Good shock absorption and long service life

The serpentine spring coupling realizes the connection between the prime mover and the working machine by inserting the serpentine spring sheet into the tooth grooves of the two coupling halves along the axial direction. During operation, it is driven by the circumferential force of the prime mover teeth facing the spring sheet. The driven end transmits the torque.Due to the degree of flexibility of the spring plate, the elastic deformation of the spring plate occurs when the torque is transmitted, which largely avoids the resonance of the working machine and the prime mover.Because the spring plate is made of spring steel through strict heat treatment and special processing, it has good mechanical properties, which greatly improves the service life of the coupling.

1.2 High transmission efficiency and reliable operation

Through the test, the serpentine spring coupling has high transmission efficiency, its short-term overload capacity is 200% of the rated torque, and its operation is reliable.

1.3 Low noise, easy maintenance and installation

There is an aluminum alloy casing outside the serpentine spring coupling to prevent the spring from being thrown out when it is running, and the casing is filled with butter, which is not only lubricated, but also the noise when the springs are engaged is absorbed by the butter damping and eliminated.Since the spring leaf and the tooth arc surface are in point contact, the coupling has greater flexibility, so it can be installed to work with simultaneous radial, angular, and axial deviations.

2 Selection of serpentine spring coupling in belt conveyor

选用蛇形弹簧联轴器需要输送机械的一些信息：(1)功率或扭距；(2)转速；(3)应用场合或被连接的设备类型；(4)被联结轴的直径及公差；(5)实际空间的限制情况；(6)特殊孔或完成孔信息及安装形式；(7)有无反向和刹车峰值载荷。

　The serpentine spring coupling is a structural metal.It relies on serpentine springs to transmit torque.The serpentine spring coupling is a relatively common shaft coupling transmission component in the mechanical field today, and it is also a very versatile shaft coupling transmission component.Snake spring coupling is a tool that can withstand large torque and is suitable for heavy machinery and general machinery occasions.

　　The serpentine spring leaf of the trapezoidal section is made of spring steel, which has undergone strict heat treatment and special processing. It has good mechanical properties, so that the service life of the coupling is much longer than that of the non-metal elastic element coupling.The tooth surfaces of the two half couplings in contact with the reeds are curved. When the transmission torque increases, the springs will deform along the curved surfaces of the teeth, so that the force points of the two half couplings on the reeds are close.The contact point between the reed and the tooth surface, that is, the change of torque, changes with the size of the transmitted torque, and its transmission characteristics are variable stiffness.Therefore, it has a larger load variation than general elastic couplings.The cushioning effect produced by the transmission force when the reed deforms along the tooth arc, especially when the machine is started or under strong impact load, can protect the supporting parts to a certain extent.

　　The transmission efficiency of the coupling, its short-term overload capacity is twice the rated torque, and the operation is reliable.The aluminum alloy shell protects the spring from being thrown out during operation, and the shell is filled with butter, which not only makes the lubrication good, but also makes the noise when the reeds engage is absorbed by the butter damping and eliminated.The whole machine has fewer parts, small size and light weight. The spring leaf designed as a trapezoidal cross-section and the trapezoidal tooth groove are particularly convenient and close, so that the assembly, disassembly, and maintenance are simpler than ordinary couplings.Because the spring leaf and the tooth arc surface are in point contact, the coupling can obtain greater flexibility.It can be installed to work normally under conditions of radial, angular and axial deviations at the same time.

Features of Snake Spring Coupling:

　　1 Large transmission torque, high variable load range, short-term overload capacity is twice the rated torque

　　2 High transmission efficiency, start. High transmission efficiency,;

　　3 Simple structure; convenient disassembly and assembly,

　　4 Good vibration damping, avoiding resonance, and long service life

　　5 Low noise, good lubrication, aluminum alloy casing to protect the spring from being thrown out during operation

　　6 The whole machine has few parts, small size and light weight

　　7允许有较大的安装偏差。两半轴允许相对径向位移0.5-3mm，轴向位移4-20mm,角位移1°~15°。