On the Use and Vibration of Serpentine Spring

The serpentine spring coupling is a universal shaft coupling transmission component, and problems will inevitably occur in use. What problems will occur in the use of the serpentine spring coupling?

1、 As the angular compensation of drum gear coupling is greater than that of straight gear coupling, drum gear coupling is widely used. Straight gear coupling is an obsolete product, so it should not be selected as much as possible.

2、 Because the spring plate is in point contact with the tooth cambered surface, the coupling can obtain great flexibility. It can be installed to work normally with radial, angular and axial deviations.

3、 During the use of the serpentine spring coupling, problems like this and that will inevitably occur. The problems that may occur are mainly vibration.

4、 This coupling has the advantages of small radial size, large bearing capacity, and is used for shafting transmission under low speed and heavy load conditions. The dynamically balanced gear coupling can be used for transmission, such as shafting transmission of gas turbine.

5、 The whole machine has few parts, small volume and light weight. The spring plate with trapezoidal section is designed to fit the trapezoidal tooth slot more conveniently and closely, which makes assembly, disassembly and maintenance easier than ordinary couplings.

The serpentine spring coupling is applicable to the working condition with small change of transmission torque, and may encounter the problem of large vibration in use. Let's share how to solve the problem of large vibration in the application of serpentine spring coupling?

1、 Whether there is obvious blade passing frequency, and it is verified by field test that fan vibration is not related to baffle opening, indicating that the flow passage of fan is normal.

2、 Bearing and vibration in all directions are mainly power frequency, with obvious double frequency components. Whether there is obvious bearing failure frequency indicates that each bearing is free from failure and is well installed and lubricated.

3、 According to the field measurement data, the vibration at the non driving end (impeller side) of the fan is less than that at the driving end. The vibration of both fans is not caused by the mass imbalance of the serpentine spring coupling of the impeller itself or the mass imbalance of the fan rotor after installation.

There will inevitably be problems in the use of the serpentine spring coupling. The problems that may occur are mainly vibration. Therefore, I will give you a good explanation on how to solve this problem. The advantages of this coupling are small radial size, large bearing capacity, long used for shafting transmission under low speed and heavy load conditions, and dynamically balanced gear coupling can be used for transmission, such as shafting transmission of gas turbine.

The whole machine has few parts, small volume and light weight. The spring plate with trapezoidal section is designed to fit the trapezoidal tooth slot more conveniently and closely, which makes assembly, disassembly and maintenance easier than ordinary couplings. As the angular compensation of drum gear coupling is greater than that of straight gear coupling, drum gear coupling is widely used. Straight gear coupling is an obsolete product, so it should not be selected as much as possible.

The serpentine spring coupling is composed of two half couplings and serpentine springs. Each half of the coupling has a spring slot. In actual work, the spring is embedded in the spring slot to complete the torque transmission. The serpentine spring couplings are not embedded in each other radially, so that when the equipment moves, only the serpentine spring can be removed without axial movement of the equipment. This does not reduce the maintenance accuracy of the serpentine spring coupling and shorten the maintenance time. After being used in four sets of drives, the serpentine spring couplings work well.

The production was not affected by the problem of the coil spring coupling once. In the process of changing the liquid viscous soft starter, there was no need to move the motor and other equipment, which shortened the maintenance time and reduced the labor satisfaction. Under the same torque, the torsion angle is inversely proportional to the stiffness. The torsion angle of the serpentine spring coupling is small, and its torsion stiffness is greater than that of the non drum serpentine spring coupling. Due to the increase of torsional stiffness, the vibration caused by the drum shaped coil spring coupling will also be weakened when transmitting torque. During the use of the serpentine spring coupling, the serpentine spring is easy to be damaged. The service life of the coupling is directly determined by the quality of the spring.

The material selection of the coil spring of the coil spring coupling is very important, because in the whole transmission process, the coil spring is used to transmit torque, and the elastic variables generated by the coil spring when transmitting torque enable the mechanical system to obtain a good damping effect, thus avoiding the occurrence of resonance. Once the coil spring breaks and other damages occur, the entire transmission part cannot work normally, and because it works under the dynamic load environment, Therefore, the main material of the snake spring should be high yield. Spring steel has good elasticity, is not easy to cause plastic deformation when bearing heavy load, has a good degree of fatigue, has a long service life under repeated load, and has sufficient toughness, and can prevent sudden brittle fracture under the impact force.