Inspection and Repair of Coupling on XINLAN Analysis Planer

XINLAN analyzes, surveys and processes the matching external teethCoupling.The inner hole size of the external gear coupling should be determined according to the shaft diameter d and the interference U during the heat sleeve.
The main drive shaft of the planer and the main reduction mechanism are generally connected to its structure through internal and external gear couplings.Among them, the main drive shaft and the external gear coupling are usually connected by spline or symmetrical flat key connection.Because the shaft diameter here is small and the connection strength is low, failures often occur after long-term use or when subjected to excessive loads, which affects normal production.The simplest way to repair is to replace the main drive shaft and external gear coupling, but it requires tens of thousands of dollars.In order to save money, our company has been adopting repair methods and achieved obvious results.
     The matching external gear coupling for surveying and processing.The inner hole size of the external gear coupling should be determined according to the shaft diameter d and the interference U during the heat sleeve.The interference U can be calculated by the following formula according to the maximum torque to be transmitted and the size of the shaft diameter.In the formula: 2Mk--maximum transmission torque, N·mm f--static friction coefficient between the contact surfaces of the parts, generally 0.15 d--nominal diameter of the mating surface, mm z--fitting length, mm E1, E2- -Respectively, the elastic modulus of the material of the enclosed part and the enveloped part, MPa
Calculate the heating jacket temperature T.The temperature T required for the heating jacket is calculated by the following formula.
　　T=K(U+δ)/(βd) (3)
　　In the formula: T-heating temperature of the envelope, ℃
　　K--Considering the heat loss coefficient from the time the heater is taken out to the completion of assembly, K=1.1～1.2 in summer and K=1.15～1.5 in winter U--actual interference at room temperature mm δ--guaranteed The minimum clearance required for free assembly, mm β--the linear expansion coefficient of the heating element d--the nominal diameter of the mating surface of the part,
　　It can be seen from formula (3) that the larger the diameter d, the lower the heating temperature required.
Heat the external gear coupling to the calculated temperature, then install it on the main drive shaft and cool it naturally to room temperature, so that the main drive shaft and the external gear coupling become a whole.
　　On gantry planers where the main drive shaft and the external gear coupling are connected by a flat key, the flat key or keyway is often crushed, and the flat key is broken.At this time, it can be repaired by replacing the flat key, surfacing the deformed keyway on the main drive shaft, and reprocessing the keyway by rotating 90°.However, sometimes the main drive shaft and the external gear coupling joint will have a severe failure of the main drive shaft fracture. When this happens, we often use the following methods to repair it.