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3 Actuator movement and the dynamic parameter calculation
3.1 Given the original data is broken for 20 to 30 tons. Crusher rotor speed between 800 and 1100 min/r, the biggest content feed crusher, degrees are: less than 150 mm, the crusher the maximum discharging granularity of no more than: 10 mm crusher material allowable humidity less than 9%. Crusher broken degree for: medium and fine. Crusher application places: cement plant, coal preparation plant, thermal power plant, etc. Crusher crushing object is: limestone, coal, coke, gypsum and other soft materials.
3.2 The determination of rotor speed
Hammer crusher rotor speed is calculated based on circumferential velocity required, hammer head circumference speed according to the property of being broken material, broken product granularity, hammer head wear factors to determine. The higher the speed, the product particle size is smaller. Hammer and lining board, the greater the gas of the wear. Power consumption increased. For precision machine parts processing, installation requirements. In situations that could satisfy the requirement of its particle size, circumferential velocity should be on the low side.
The calculation of productivity, productivity and the specifications of the hammer crusher, rotary speed, discharging gas gap, feed particle size, the width of the feeding condition and material properties and other factors. Because of the type of crusher is medium and hard materials. K value is between 30 to 45.
3.3 The rotor's diameter and length
The specifications of the hammer crusher with rotor diameter D and length L, so the diameter of the rotor D = 785 mm, the length of the rotor L = 830 mm. Because hinged on the rotor, so the correct selection of the hammerhead quality has a great influence on the crushing efficiency and energy consumption, if the hammerhead quality selected too small, could not satisfy the hammer to break the material requirements at one time. If choose too large, useless power consumption is too large, centrifugal force is big, influential to other parts and easy to damage. Selected according to the theorem of momentum hammer quality, after considering the hammer blow material, will inevitably produce loss of speed, if the loss is too big, can make the hammer head hanging shaft partial backward around itself. Lower productivity and increase the consumption of busywork. In order to make the hammer blow after material slants down, can by centrifugal force role when the next time the broken material quickly back to the correct position. So, after the hammer blow material shoulds not be too great loss of speed. Generally allow speed loss of 40% to 60%
3.4 The feeding mouth width and length
The length of the feeding mouth of hammer crusher and the rotor is the same. B > 2 maxD its width
4.1 Axis of the choice of materials
The materials are mainly carbon steel and alloy steel. The blank most with rolling round steel and steel shaft forgings. Others use round steel directly. Than low alloy steel, carbon steel sensitivity to the stress concentration is low, at the same time can also use the method of heat treatment and chemical heat treatment to improve the wear resistance and fatigue resistance. Manufactured carbon steel shaft is particularly widespread. The most commonly used is 45 # steel. Determine the length of the main shaft of the paragraphs, as far as possible, make its compact structure, and ensure that at the same time, the rotor and the pulley, flywheel, bearing needed for assembly and adjustment of space, that is, determine the axial length of the paragraphs, must consider the various parts and the spindle with part of the axial size and necessary clearance between adjacent parts.
Cooling (5), and reducing load, friction pair of journal for fever take cooling design, also can significantly increase its fatigue life. Because the spindle is a rotating part, so, after running a certain number of cycles under low stress, then gradually increase to the design of the stress level.