There are two types of pin couplings: key connection and flange connection.The key connection is generally divided into keyway connection and splineway connection and clamping keyway connection.Commonly used is the ordinary keyway connection. When assembling the keyed coupling, it should be noted that the hub and the shaft are not in the axis due to the improper assembly of the key.The temperature difference assembly method of gear coupling mostly adopts heating method, and the method of cooling is relatively small.The correct installation should make the two sides of the key closely fit the wall of the keyway. Generally, the coloring method is used for inspection during assembly. If the fit is not good, a file or spatula can be used to repair it to meet the requirements.There is generally a gap on the upper part of the key, which is about 0.1-0.2mm.High-speed rotating machinery has high requirements for the coaxiality between the hub and the shaft. The single-key connection cannot obtain high coaxiality, and the double-key connection or spline connection can improve the coaxiality of the two.

　　Pin couplings are generally installed with requirements to indicate that they are hot-installed. The method is to put the half coupling shaft hole in high-flash point oil for oil bath heating or welding torch baking, and some use an oven to heat and assemble Oil bath heating and welding torch baking are often used on site.The high temperature that the oil bath can reach depends on the nature of the oil, and it is generally below 200°C.As for the actual heating temperature of the hub, it can be calculated according to the interference value of the hub and the shaft and the requirements when the hub is heated on the shaft.

　　1. Elastic coupling positioning screw fixation: The gap between the two positioning screws is 90ordm; the fixed shaft is locked, the traditional fixing method, because the front end of the screw contacts the shaft, it may cause damage to the shaft or difficulty in disassembly. .

　　2. Elastic coupling clamping screw fixation: Utilize the tightening force of hexagon socket bolts to shrink the slit and clamp the shaft tightly.This method is convenient to fix and disassemble, and will not cause damage to the shaft, and is a very common fixing method.

　　3. Elastic coupling keyway type fixation: suitable for high torque transmission. In order to prevent axial sliding, it is usually used together with set screw fixation and clamping screw fixation.

　　4. Elastic coupling with D-shaped hole for fixing: Usually, if the shaft of the motor is D-shaped, if the positioning screw cannot be fixed, the hole of the coupling can be processed into a D-shaped corresponding to the size of the motor shaft. The hole is fixed with the positioning screw, so there is no need to worry about slipping.

　　5. Expansion sleeve fixing: tighten the four positioning screws on the end face of the Lingsi coupling to compress the account cover. It is suitable for the connection and fixation of some stepping motors and servo motors with large torque, such as the expansion sleeve JMLJ type membrane. Plate coupling, expansion sleeve LMZ-1 plum blossom coupling, expansion sleeve bellows coupling, expansion sleeve elastic coupling, etc.