Expansion coupling sleeve

The main function of the expansion coupling sleeve (referred to as the expansion sleeve) is to replace the coupling effect of the single key and the spline to realize the connection between the mechanical parts (such as gears, flywheels, belt pulleys, etc.) and the shaft to transmit load.In response to such problems, polymer composite materials can be used in the field, which is mainly divided into the following steps: surface treatment of the worn parts of the journal and the inner hole of the gear to be clean, dry and rough, and expose the original metal color and shaft diameter. Coat the surface with polymer metal material 2211F, scrape it with a ruler, and solidify; treat the surface of the gear inner hole and apply polymer metal material to smooth and solidify the wear marks; after the material is heated and solidified, the surface of the material is polished and flattened with expansion The inner ring of the sleeve is used as a mold to match the size of the shaft diameter surface, and the feet are polished, and then the size is measured; the inner and outer rings of the expansion sleeve are coated with polymer metal materials for general assembly.Due to the long-term transmission of large torque during work, the expansion coupling sleeve is likely to cause fatigue deformation of the metal, causing fatigue and wear between the expansion sleeve and the fastener. At the same time, the sintering machine is generally large, which causes difficulty.

Compared with the key connection, the expansion sleeve connection has many advantages:

1. When the expansion sleeve is overloaded, it will lose its connection and protect the equipment from damage.

2. The expansion sleeve connection can bear multiple loads, and its structure can be made into a variety of styles.According to the installation load, multiple expansion sleeves can also be used in series.

3. The expansion sleeve is easy to disassemble and has good interchangeability.Since the expansion sleeve can combine the shaft hub with a larger fit gap, the bolts are loosened when disassembling, and the connected parts can be easily disassembled.When swelling tightly, the contact surface is tightly attached and it is not easy to produce rust, and it is also convenient for connection and disassembly.

4. The use of expansion sleeves makes the manufacture and installation of main machine parts simple.The processing of the shaft and hole for installing the expansion sleeve does not require manufacturing tolerances like interference fit.There is no need for heating, cooling or pressurizing equipment when installing the expansion sleeve, just tighten the bolts according to the required torque.The adjustment is convenient, and the hub can be conveniently adjusted to the desired position on the shaft.The expansion sleeve can also be used to connect parts with poor weldability.

5. The expansion sleeve has a long service life.The expansion sleeve relies on friction transmission, there is no keyway weakening to the connected parts, and there is no relative movement, and there is no wear during work.