The disintegration and maintenance of the hard bus joint after processing by the bus processing machine is mainly the following aspects: (1) subsidizing the melting or falling off of the thermometer. (2) Replace spring washers that have lost elasticity and damaged bolts and nuts. (3) in order to prevent the oxidation of the surface and joint of the bus joint, after each overhaul to fill with oil paste, and then coated with vaseline oil. (4) Tighten the connection bolts on the contact surface. The degree of tightening of bolts depends on the temperature at the time of installation. When the temperature is high, the bolts should be tightened and when the temperature is low, they should be loosened. When screwing the nut, choose a wrench of appropriate size according to the diameter of the bolt. The use of too large wrench, slightly more force to break the bolt lime; Too small spanner is used, often with a lot of force but the nut is not tightened. Since aluminum deforms slowly under pressure, the bolts will become loose after some time after tightening, so check the tightness of the bolts again before sending power. After the nut is tightened, 0.05mm feeler ruler should be used to check the tightness of the joint around the joint. (5) Processing of contact surface. The oxide film, pores or ridges on the surface should be removed to make the contact surface smooth and slightly rough. The method of processing can be used coarse file to drop the serious uneven place of the bus surface, and then brush with steel wire. The aluminum bus wire should be coated with petroleum jelly (because the aluminum surface is easily oxidized, it is necessary to use petroleum jelly to separate the surface of the bus wire from the air), and then brush again with a wire brush. Finally, wipe off the dirty petroleum jelly and apply a thin layer of new petroleum jelly and a sticker to protect the contact surface. The contact surface of the aluminum bus should not be polished with sandpaper, so as not to embed the glass dust or sand into the metal and increase the contact resistance. The contact surface of copper bus or steel bus should be lined with a layer of tin. If the tin layer is damaged due to flat contact surface and other reasons, it should be heavily lined. The method of tin lining is: the solder is melted in the tin pot, and the part of the bus to be lined with tin is leveled and brushed, and the rosin or welding oil is put on the pot. And then many times to pour the tin, when the end of the bus stick tin, you can directly put the end of the tin pot in the dip, and then take out with a rag to wipe off the excess. The thickness of tin lining layer is about 0.1-0.15mm. The melting point of solder is between 183-235 degrees, generally according to its color to distinguish, that is, the pot of solder is light blue, you can start lining tin.