How to remove the pulley or coupling?
The removal method and steps of the pulley or coupling are as follows.
1 Loosen or knock down the fixing screw on the pulley or the coupling, and add kerosene to the contact hole between the inner hole of the pulley or the coupling and the shaft to be infiltrated and lubricated. Then slowly pull the pulley or coupling out with a special gripper (also known as a die), as shown in Figure 1-1 (a). When using the shaft puller, the center of the screw should be aligned with the center line of the shaft, and pay attention to the force of the pulley or the coupling. Do not break the wheel insulation or damage the shaft puller.
2 If the pulley or coupling is tightly packed or rusted, it is not easy to remove. Wrap the shaft with a damp cloth, and use a blower to quickly and evenly heat the pulley or coupling to expand it, and pull it out and remove it.
3 You can also use the square iron with the end of the wedge to tilt the inner ring of the pulley or the coupling. As shown in (b) of Figure 1-1, tap the other end of the square iron with a small hammer to connect the pulley or the joint. The shaft is removed.
If you do not need to clean the bearings or bushings of the motor, you do not have to disassemble the coupling.
Install the pulley or coupling, there are two methods of cold and hot.
1 When chilling, align the keyway or tighten the screw hole first. For small and medium-sized motors, put a wooden block on the end face of the pulley or the coupling and slowly tap it in with a hammer. If it is difficult to knock in, place a block on the other end of the shaft and place it on the wall, then tap the pulley or coupling. For large motors, the pulley or coupling can be pressed into the shaft with a jack. However, a fixed support frame is used to hold the other end of the motor and the bottom of the jack.
2 Heat kit refers to heating the pulley or coupling of the interference fit to expand to a certain extent, and quickly pull it onto the shaft. Because the hole and shaft of the pulley or coupling are mostly transmitted with an interference fit.
The heating method of the hot set is oven heating and hot oil cooking.
1 When heating in an oven, the pulley or the coupling is placed in the oven, so that the heating is uniform, the heating rate is preferably 60 ° C / h, the temperature can not be too fast, the heating time depends on the amount of expansion. It can be detected by the prepared expanded inner diameter size needle, and the hot sleeve can be performed when the needle can protrude into the inner hole.
2 When cooking with hot oil, install a support frame in the fuel tank equipped with transformer oil, place the pulley or coupling on the bracket, then heat the oil to expand the pulley or the coupling, and heat the jacket. . To prevent uneven heating, the pulley or coupling cannot be in direct contact with the tank floor.
