The elastic pin is used on the TL-type LXZ-type pin coupling, which is mainly used to drive the two half couplings to fix and transmit.And whether the hardness of the pin will produce a certain change in the torque of the coupling, the researchers have shown through experiments that for the standard data, the fixed number, size and material of the backrest pin will not change the torque too much, and if the number is Increasing, or the size of the coupling pin becomes larger, or the material of the pin becomes harder, which will greatly change the torque of the coupling.The shaft hole tolerance of the coupling generally follows the mechanical department standards H7 and H9, which can also be referred to as interference fit and transition fit for short.Among them, the interference fit refers to a positive tolerance, plus a tolerance of 10-20 wire. The difference between the small limit size of the hole minus the maximum size of the shaft is the large interference Ymax, which is the tight state of the hole and shaft fit.Interference fit can only be small but not large within the specified tolerance range. Excessive fit means that there is no oil. The specified tolerance can be large or small; in general, if the shaft hole needs interference fit, it can be marked in the processing drawing. Or you can follow the principle of thermal expansion and contraction, and the shaft hole that needs to be hot-fitted can be interference fit, which is to facilitate the operation and installation of workers, and the second is to ensure that the coupling special tensioning sleeve is better connected.

　　The LXZ type pin coupling is a nylon pin that penetrates into the pin hole on the coupling flange, and is matched with the half coupling to transmit torque.However, the pin hole needs to be quenched and tempered. Because the transmission time is too long, the pin hole will be enlarged and the tolerance will become larger, resulting in uneven force on the coupling shaft hole. Therefore, after the coupling is processed and formed The pin hole needs to be quenched and tempered and dipped in fire.Heating is one of the important processes of heat treatment.There are many heating methods for metal heat treatment. Charcoal and coal were used as heat sources, and then liquid and gas fuels were used.The application of electricity makes heating easy to control, and there is no environmental pollution.These heat sources can be directly heated, or indirectly heated by molten salt or metal, or even floating particles.