Zhengzhou Tongwang Machinery Equipment Co

The main components of the jaw crusher include the mandrel, eccentric shaft, thrust plate, movable jaw connecting rod, tension spring, frame and flywheel. Their design calculation methods are introduced below. This shaft only swings with the movable jaw but does not rotate. It is only affected by the component force acting on it by the crushing force

and the bending moment generated by the movable jaw's own weight and is not affected by torque. Therefore, the design calculation is performed as a beam with two points. The mandrel is generally made of high-quality carbon steel with limited strength

~

, and its allowable bending stress is



. The eccentric shaft is the most important part of the jaw crusher. When the maximum crushing force acts on the movable jaw

, it bears the tensile force

In addition, flywheels and pulleys are installed at both ends of it, so it also bears the gravity of the flywheel and pulleys. Belt tension and torsion, as well as centrifugal force of the eccentric part. In the design calculation, calculate the torque and bending moment according to the rotation axis at the two points, and calculate the equivalent bending moment

. Design and calculate the diameter of the eccentric shaft according to the formula


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The eccentric shaft of small and medium-sized jaw crushers is made of high-quality carbon steel with limited strength

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.


Large jaw crushers are made of alloy steel with limited strength
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, which
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. And it should be quenched and tempered or normalized heat treatment to improve the strength and wear resistance of the eccentric shaft. Finally, the fatigue strength of the eccentric shaft of the spindle core should also be considered. Thrust plate The thrust plate is the simplest and lowest cost part of the jaw crusher. In the standard structure, it is used as a safety part at all times. When designing the thrust plate of a small hammer crusher, the width of the thrust plate is usually determined based on the width of the movable jaw, and then the thickness of the thrust plate is obtained. The calculation formula is as follows. With the development and popularization of computers, the finite element method is used in crushing The application of crusher design is becoming more and more common. The finite element method can not only conduct strength analysis on the existing thrust plate, but also compare multiple plans for the newly designed thrust plate of the crusher, thereby improving the design. The tensioning spring is used to ensure the tight integration of the entire mechanism of the jaw crusher and partially balance the inertial force generated when the movable jaw and thrust plate move. When designing springs, the spring stiffness must be selected reasonably. If the spring stiffness is insufficient, it will not meet the above requirements. If the stiffness is too large, it will cause too much unproductive energy consumption. Zhengzhou Tongwang Machinery Equipment Co., Ltd. National Sales Hotline