(1) Stiffness criterion
Stiffness refers to the ability of a part to resist elastic deformation. Uranium parts such as machine tool spindles and motor shafts must have sufficient rigidity to ensure normal work.
(2) Abrasion resistance criteria
The parts of the automatic waste paper baler will change the original structure shape and size after running and wear, which will reduce the accuracy of the machine, weaken the strength, cause the parts to fail, and seriously cause the automatic waste paper baler to be scrapped. Among the scrapped automatic waste paper baler parts, about 80% are caused by wear. Therefore, in the design of automatic waste paper baler, we always strive to improve the wear resistance of parts and minimize the wear of parts.
(3) Strength criterion
Under ideal and stable working conditions, the load acting on the part is the nominal load, and the stress calculated according to this load is called the ill-fated force. When the machine is running, there are often additional loads acting on the parts, and the load factor K is usually used to consider the effect of the additional load. The product of the nominal load and the load factor is called the calculated load. The stress calculated according to this load is called the calculated stress.
Strength is the most basic calculation criterion to measure the working ability of automatic waste paper baler parts. In order to make the parts work normally, that is, no fracture, excessive residual deformation and fatigue failure occur during work, the parts must have sufficient strength. The parts of the automatic waste paper baler must meet the strength conditions.
(4) Heat resistance guidelines
Parts work at high temperatures and creep (the stress in the metal is constant, often low stress, but slow and continuous plastic deformation occurs), which will reduce its strength limit, fatigue limit, and destroy normal lubrication conditions.
(5) Vibration stability criterion
There are many vibration sources that change over time on the automatic waste paper baler, such as backlash meshing of gears and eccentric rotation of uranium. When the vibration frequency of the automatic waste paper baler or parts is similar or equal to the frequency of the periodic interference force, resonance will occur, which is called loss of vibration stability. Resonance not only affects the normal operation of the automatic waste paper baler, but also produces noise, and even damages the automatic waste paper baler.