The roller is composed of various accessories, including roller stamping bearing seat, roller bearing, roller seal, roller bracket, spacer sleeve, hook joint, cast steel tweezers, cylindrical pin, roller shaft and card. Spring retaining ring, etc.

1. Roller stamping bearing seat: The roller bearing housing is divided into two types, one is a stamped bearing seat, and the other is a cast iron (grey iron) bearing seat. Most of the stamped bearing housings are welded with steel tubes, and the cast iron housings are extruded with steel tubes. The characteristics of the stamped bearing housing are sealed and the overall bearing capacity is strong. The biggest feature of the cast iron housing is the high concentricity, but the bearing capacity is lower than that of the stamped bearing housing.
2. Roller bearing: The bearing is the most important part of the roller. The quality of the bearing directly affects the service life of the roller. Therefore, choosing the roller bearing is more cautious than selecting other roller accessories.

3. Roller seal: The roller seal material is divided into polyethylene and nylon. Polyethylene has low cost but relatively poor wear resistance. On the contrary, the sealing cost of nylon material is relatively high, but the wear resistance is high (identifying whether it is nylon material, the seal can be put into water, and the sinking is the sealing of nylon material. Floating on the water is the seal of polyethylene). The roller seal is divided into nearly ten types according to the type of roller, such as TD75 type, DTII type, TR type, TK type, QD80 type, SPJ type and so on.

4. Roller shaft: The idler shaft is divided into a cold drawn steel shaft and a stepped shaft. Note: The tolerance of the roller shaft must be between 0.002mm and 0.019mm.
5. Circlip: The circlip used for the roller is made of spring steel, which plays the role of fixing the roller. Inferior springs have poor elasticity and variability, and can not properly prevent the roller movement under the stamping of external force.

6. Retaining ring: The fixing of the parts on the shaft is divided into axial fixed and circumferential fixed.
The roller accessory can play an important role and value in the use of the roller, can assist the use and maintenance of the roller, and help the user play an important role and value in maintaining the roller.

The production and processing precision of the roller parts mainly refers to the concentricity of the inner holes of the outer casing and the idler and the machining precision of the axial dimensions of the parts. If the concentricity is too bad, it will cause the rolling bearing to bite, increase the resistance and reduce the service life; if the axial dimension error of the part is too large, a large axial gap will be formed, causing axial turbulence, destroying lubrication and sealing; If the installation quality is not good, the deviation will occur, the card will be bitten, the wear will be aggravated, and the service life of the roller will be greatly reduced. How to properly arrange the rollers, design the appropriate roller group spacing, reduce the number of rollers, reduce the price of the whole machine, reduce investment, operation and maintenance costs, and improve economic efficiency. The processing technology of the roller is an important aspect.