Double torsion spring has a very important function, that is, buffering function. For example, the buffer double torsion spring at the bottom of the elevator can effectively avoid danger. Shock-absorbing springs on cars, motorcycles and trains absorb vibrations when the road gets bumpy, which not only reduces the bumps caused by the parts. At the same time, wear is reduced, service life is extended, and passengers feel comfortable.

　　Double torsion spring elasticity is a common problem in the spring manufacturing process. In large cases, sometimes it is a design problem, sometimes it is a production process problem, and some is a raw material hardness problem, which will be analyzed one by one below.

　　First, the double torsion spring design results in excessive spring force: Generally speaking, when designing springs, we only design for the ideal state. Excessive spring force can only be found in actual production, which is usually caused by the guide rail (the outer diameter is too small, the steel wire diameter is too large, and the pitch design is unreasonable).

　　Second, the production process results in excessive elasticity of the double torsion spring: in the actual production of the spring, there are various accuracy problems and can only be designed. Under ideal conditions, raw material errors, spring inner and outer diameter errors, pitch errors and poor tempering temperature control will all affect the product. Only by appropriately modifying small parameters according to the actual situation and on the premise of meeting customer requirements can the product's flexibility and expected effects be achieved, and testing equipment is indispensable.

　　Third, the hardness of the raw material causes the double torsion spring to be too elastic: a spring of the same specification is wound by two batches of different spring steel wires. The spring forces must be different. The hardness threshold range of spring steel wire is generally larger and related to the furnace temperature. Since it cannot be fully controlled, all parameters of each batch of spring wire rods need to be tested in advance and the production end adjusted according to the actual situation. For example, by controlling the furnace temperature and spring tempering time, ensure that the elasticity of the product meets the drawing requirements. A one-way device, also known as an isolator, is a device used to transmit electromagnetic waves in one direction. It is a non-reciprocal dual-port microwave ferrite device.

　　When the electromagnetic wave is positive. When transmitted to the load, all the power can be fed to the load, and the reflected wave from the load can be greatly attenuated. This one-way transmission feature can be used for isolation. The effect of load changes on the signal source. Unidirectional devices are irreversible attenuators. In other words, the forward wave is attenuated less and the reverse wave is attenuated more by a unidirectional device placed on the waveguide body.

　　The electromagnetic field only passes in the direction indicated by the arrow in the casing of the one-way device. It mainly plays an isolation role, which can increase the standing wave ratio and ensure the stable operation of each component and unit without affecting each other. Unidirectional devices, such as circulators, utilize the magnetic field of electromagnetic waves, the phase and constant magnetic field of ferrite elements. Communicate with each other to get work done. The ferrite sheet is placed perpendicular to the wide edge of the waveguide, its surface is coated with a resistive film, and a permanent magnet is used outside the waveguide. A constant magnetic field is generated perpendicular to the broad side of the waveguide. If a constant magnetic field changes direction, it will pass in the opposite direction. One-way springs are mainly divided into flat springs, round springs and tower springs. Compression springs (compression springs) are coil springs that bear directional pressure. The materials used are mostly circular in cross-section, but also consist of rectangular and multi-stranded ones.