The drum is mainly composed of four parts, in which the bearing and the circlip are standard parts, the drum shaft and the drum shell are non-standard parts, because the application is in the field of dynamic weighing, the requirements on the drum are very high, and the common standard drum on the market is fundamental. Can not meet the requirements. It is necessary to ensure that the density of the drum shaft and the shell is uniform, the surface of the active drum is knurled, and the friction between the belt and the belt is increased.
Both the Roller Shell for Pellet Machine and the shaft are shaft parts, and the shaft parts are one of the typical parts often encountered in machines. It is mainly used to support transmission components, transmitting torque and bearing loads. The shaft type component is a rotating body part whose length is larger than the diameter, and generally consists of an outer cylindrical surface, a conical surface, an inner hole and a thread and a corresponding end surface of the concentric shaft. According to the shape of the structure, the shaft parts can be divided into an optical axis, a stepped shaft, a hollow shaft, a crankshaft and the like. A shaft with an aspect ratio of less than 5 is called a short axis, and a length greater than 20 is called an elongated shaft, with most of the axes being between the two. The shaft is supported by bearings, and the shaft section that cooperates with the bearing is called a journal. The journals are the assembly benchmarks for the shafts. Their accuracy and surface quality are generally required. The technical requirements are generally based on the main functions and working conditions of the shaft. The main requirements are as follows:
(1) The dimensional accuracy is higher than that of a general part. The precision of the bearing journal in the shaft parts is the highest, which is IT5~IT7; the dimensional accuracy requirement of the matching journal can be lower, which is IT6~IT9.
(2) High shape accuracy.
(3) The positional accuracy is high, and the radial runout of the general axis is 0.01 to 0.03, and the axis of high precision is 0.001 to 0.005.
(4) The surface roughness is higher than that of the general parts. The surface roughness Ra of the support journal and the important surface is usually 0.1 to 0.8 um, and the surface roughness Ra of the matching journal and the minor surface is 0.8 to 3.2 um.
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