How to design and calculate the main shaft bushing of spring cone crusher
The cone bushing of the spring cone crusher is the main shaft bushing, and the design of the cone bushing is also the design of the cone hole in the eccentric bushing. This is because the cone bushing is fitted in the cone hole in the eccentric bushing and the cone bushing inner hole is connected to the main shaft. Use clearance fit. Therefore, the design of the cone bushing involves the suspension point of the movable cone, the intersection of the center line of the cone hole of the eccentric shaft sleeve and the center line of the crusher, and the motion state of the eccentric component. The following is a specific analysis of the design method.
Before designing the cone bushing, the precession angle r0, the spindle size d1, d2, the distance H from the plane of the eccentric bushing to the suspension point O, the diameter and the height D, H are all known. According to the geometric relationship shown in Figure 1 below, the swing radius R1 and R2 values from the point O to the upper opening of the cone bushing can be obtained:
Bushing design calculation
In order to make the main shaft and the inner hole of the cone bushing evenly contact along the height, the gap between the upper and lower mouth of the cone bushing a, a1 and the swing radius R1, R2 have the following relationship: a/R1=a1/R2 or a1=aR2/R1……… …③
In order to form a reliable lubricating oil film on the friction surfaces when the crusher is running, to compensate for the manufacturing and assembly errors of the eccentric parts, and to prevent the thermal expansion and deformation of the eccentric parts from jamming, a proper gap must be left between the friction surfaces of the eccentric parts . If the gap is too small, it is easy to generate heat and hold the shaft; if the gap is too large, it will reduce the service life of the machine and cause shock and vibration. Generally, it can be determined according to the actual situation with reference to the actual data of the existing crusher. If the value of the gap a of the upper mouth of the cone bushing is known, the value of a1 can be obtained according to formula ③. In this way, both the inner hole size and the outer size of the cone bushing can be determined. The intersection of the centerline of the inner cone hole and the centerline of the machine is O1, which is the suspension point of the eccentric shaft sleeve. Point O is the suspension point of the moving cone. In theory, point O is a fixed point. Therefore, the movement of the cone crushing mobile cone can be regarded as the precession motion of a rigid body around a certain point in space, r0 is the precession angle, also called eccentricity, and O1 point It is variable, and changes on the center line of the machine with the left and right movement of the eccentric sleeve.
It can be seen from Figure 1 that the angle r0?≠r0 between the centerline of the eccentric bushing cone hole and the centerline of the machine, and
Therefore, the value of r0? should be known only after the value of Δr0?
, where K1 is a coefficient related to the bushing gap, K2 is a coefficient related to the diameter of the spindle, and other parameters are known. Therefore, by substituting the actual data into the formula ⑤, the value of Δr0? can be obtained, and then r0? can be obtained according to r0?=r0-Δr0?.
In order to ensure higher efficiency of the crusher, different strokes should be used for the same crusher corresponding to different materials, different cavity types, and different crushing ratios. In order to obtain different strokes, double eccentric bushings are used, that is, the bushing in the inner hole of the eccentric bushing is also an eccentric bushing. By rotating the eccentric bushing at different positions, different eccentric distances and different precession angles r0 can be obtained, which can meet different requirements. Requirements for swing stroke.
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