The improvement of the bearing on cone crusher
Old series cone crusher in the defects, has focused on the spindle, resulting in broken shaft accident. According to the site of the broken shaft, damage cross-section of analysis and operational issues, and do strength check calculation, that the spindle break the following reasons:
1) lack of spindle intensity: after strength training 'operator know that the main issue of the glaze is called the static strength of persistent anxiety, can not be sustained on the ground to ensure the normal broken ridiculed for. Than iron, the dangerous section of the bending stress children, most of the material over a limited term service.
2) the impact of overload: in the course, due to the lack of spring pressure, the hard crushing ore, broken machines often have the upper beat. Again taken to increase the compression spring means breaking force, so that also increases the force on the spindle. At the same time the safety of the spring trip is shorter, so that when the spring is almost over when the soap breaks the iron status, only regularly pull off the spring screw, leaving the plant spindle to withstand greater load.
In addition, due to uneven lining wear, the product size becomes coarse and uneven. J m unit force to get qualified product size, will be transferred to touch the cover of discharge port level. This card had iron or iron greatly increased the number of times.
According to the broken shaft of the reasons, the new series, made the following improvements.
(1) according to the new design of the spring pressure, the corresponding design of the axis of the cries, the generally increased the diameter of the shaft.
(2) to improve off-axis part of the rounded shape, to increase their degree of surface light stick, will finish the V3 to V6, in order to reduce the stress concentration there. Old series, where radius is 10 mm (small). Change after the cone axis with radius tangent to the lower part of the upper phase with the cylinder axis. Dotted line and the size of the old family 1650 brackets breakers, solid line, and no parentheses after the size of 1750 to improve the crusher.
(3) reduce the spindle and the cone of interference with the body. To ensure that the spindle and the body does not occur during operation, loose, requires a certain degree of interference. The greater the amount of interference the more solid, but will also increase the stress concentration, reduces fatigue strength of the spindle more serious.
(4) increased shedding tank, will reduce the pressure with; raw power of the blood concentration factor of about 30%, the maximum bending moment, pressure, and rounded with the concentration of negative factors such as fatigue and Ib do not focus on in this section.