The snake spring

The snake spring is also called the coupler spring.It belongs to a special type spring.It is made of a snake shaped steel strip with constant elasticity,and the surface is all sprayed with rust prevention treatment.Serpentine spring for the transfer of torque and buffer in the mechanical drive system,it has been widely used in metallurgy,lifting,transportation,mining,petroleum engineering,shipbuilding,coal,rubber,shipbuilding and port machinery lifting equipment.

The snake spring has the following characteristics:

1.Allow for greater installation deviation

Due to the contact between the spring plate and the tooth arc surface,the coupling can get large flexibility.It can be installed at the same time with radial,angular,and axial deviations.

2.Bearing large range of variable load and safe starting

The tooth surface and 2.5 leaf coupling contact is curved,when the transfer torque increases,spring will arc along the tooth deformation,the coupling effect in 2.5 on the spring near the point.The change of the moment of contact between the reed and the tooth surface,that is,changes with the size of the torque,and its transmission characteristics are variable stiffness.Therefore,it can bear greater load change than the general elastic coupling.

The cushioning effect of the transmission force on the reed when it is deformed along the tooth arc,especially when the machine starts or has strong impact load,has a certain degree of protection for the safety of the matching parts.

3.Good vibration damping and long service life

The coupling to serpentine spring axial embedded in half more than 36%.

Serpentine spring trapezoidal section with high-quality spring steel,heat treated strictly,and special processing,has good mechanical properties,so that the service life of the coupling is far better than the metal flexible coupling(such as elastic sleeve pin,nylon pin coupling)for growth.

4.High transmission efficiency and reliable operation

The transmission efficiency of the coupling is 99.47%,and its short-time overloading capacity is two times of the rated torque,and its operation is safe and reliable.

5.Simple structure and convenient assembly and dismantling

The whole machine has fewer parts,smaller volume and lighter weight.The design of trapezoidal cross section spring film is more convenient and close than that of trapezoidal tooth groove,so that assembly and disassembly and maintenance are simpler than general coupling.

Because some have the above characteristics,serpentine spring is widely used in metallurgy,lifting,transportation,mining,petroleum engineering,shipbuilding,coal,rubber,shipbuilding and port machinery lifting equipment.

6.Low noise and good lubrication

The aluminum alloy housing is protected by springs to avoid running outward,and the shell is filled with butter.It not only makes lubrication well,but also eliminates the noise of the reed mesh when it is absorbed by the butter.

The heat treatment process of the snake type spring:

1,the first quenching,tempering:the first tempering and tempering of the snake type spring is to adjust the structure of the steel plate.The ssert spring blank is 145.5mm x 14.5mm x 3mm plate.Each batch has 3%samples.The blank and sample are loaded into the sling.It is heated in the salt bath furnace and the oil is cold.

The tempering parts should be cleaned,skimmed,sandblasting,and coated with protective coatings on the surface of the parts and samples.The tempering temperature is 720 C 10 C,the heat preservation is 60min,the air is cold,and the hardness is HRC26.

2,intermediate annealing:the serpentine spring is first annealed for intermediate annealing.Before the intermediate annealing,the protective coating should be applied before coating.After annealing,the residual iron coating can be removed by slight sand blasting,and then the final shape will be formed.

3,the second quenching and tempering:the purpose of second quenching and tempering of snake spring is to shape the final performance of the parts.After the final forming,the steel wire is bound up and heated and then cooled through the fully deoxidized salt bath.Water cleaning with 60~80 degrees of oil quenching,then 425-10 Deg.C tempering,tempering the specimen surface abrasion test hardness more than 0.2mm should be HRC49~51.

4,the last tempering:after testing the snake spring hardness is qualified,the parts are processed by sandblasting,and then pre treated.The pressure is measured to 55mm+1mm at the actual measurement position,30~40h is maintained,and then the final tempering is carried out.