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4.2 Bearing selection
Because of bearing, some commonly used bearing in particular, is mainly refers to some of the rolling bearing, most have been standardized, therefore, we need to be part of the design content, according to the specific working conditions, correct selection of bearing type and size. Another is the combination of bearing design, it includes installation, adjustment, lubrication, sealing and a series of content design.
4.3 Bearing materials, the choice of the type
Bearing inner ring and outer ring, rolling body, are generally made of chrome steel bearings, after heat treatment, the hardness is generally not less than HRC60. Tempering treatment generally these components need to 150 degrees, so its normal operating temperature is not higher than 120 degrees, at this point, the hardness will not decline. There are many types of bearings, mainly undertake choosing according to its load condition and economy. Because of the type of crusher, its rotor speed is higher. So on main shaft bearing of high speed, load, and work long hours, the most important is, after a long time work, will be because of the uneven wear of hammer generate unbalanced additional force (when the hammer head of uneven wear serious, the force will become the main part of the total load). The distance between bearings, shaft deflection is produced. So choose deep groove ball bearings, characterized by simple structure, mainly bear radial load, small friction coefficient, high limit speed, low price, wide application range.
4.4 Bearing winding and the axial displacement
Bearing in actual work, work before and after the temperature difference is big, in order to adapt to the shaft and the shell the influence of different thermal expansion, prevent bearing jammed. Can make the end bearing axial fixation (with round nut, for example) at the other end to the axial displacement. In this way, the bearing outer ring, the axial position has a little change, can still work normally. Also can make the outer circle with a hole loose, to ensure the relative to the cylindrical hole can do axial channeling.
5 Other parts design and selection
5.1 Body structure and its relevant design
The total weight of a machine, the weight of the frame and body parts such as accounts for large proportion. At the same time to a great extent, affects the work precision of the machine and vibration resistance. So, the choice of the correct and reasonable frame and body materials, and reasonable choose the structure form and the correct size, is to reduce machine quality, saving metal materials. The important way of improving the working precision.
5.1.1 Casting method
According to relevant data, frame, frame and the base board, etc.) and housing (including casing, etc.) in the form of a lot. According to the structural form can be pided into frame, frame, etc. This design to hammer crusher, is stationary heavy machine. Moreover, frame and body structure is complex, stiffness requirement is high, therefore, are often cast. Casting materials commonly used for construction and cheap cast iron. (including ordinary grey cast iron, ductile iron, etc.). And frame of the crusher, belongs to the manufacture of large frame, so often USES the minute, casting, and then welded into a whole.
5.1.2 Cross section shape of choice
Because of the vast number of frame and body force is relatively complex, thus to produce vibration, bending deformation, etc. So, when the bending or torsion, cross section shape on its stiffness and strength is very large. So, design a reasonable stand right and the cross section of box body shape, can act as neither increasing section area, and not increase (or decrease) the parts quality (material consumption). And increases the coefficient of cross section and cross section moment of inertia, can improve the strength and stiffness.
In use, the vast number of the frame and box adopts the cross section shape, it is for this reason. Although the bending strength of rectangular section than h section, torsional strength is less than the circular cross section, but its torsional rigidity is bigger. And with rectangular cross section frame and the internal and external wall of box body is easier to furnish other parts. So, for frame and body, it is the structure performance good cross section shape.
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