In a reciprocating pump, the crankshaft is one of the important components for converting the rotational motion of the motor into a reciprocating motion of the plunger. During operation, it will withstand cyclic alternating loads, produce alternating torsional stress and bending stress, and is therefore the most important stress component in crankshaft linkages. Since the axis of the crankshaft is not on a line, the stress conditions are very complicated, and the calculation workload for strength and stiffness verification is very large. Most domestic manufacturers still use analogy to determine the size of the crankshaft based on experience, nor are they used for strength testing. Nuclear, the result is that some products are made large, and materials and energy are wasted; some products have partial structures that do not meet strength requirements, and may bend or even break.

Plunger reciprocating pump CAD system software Crankshaft design module has features such as crankshaft dimension calculation, strength check, stiffness check, parametric drawing and so on, which can rationalize and standardize crankshaft design and improve the company's product design and development capabilities.

Crankshaft design principle Crankshaft design is mainly to determine the size of the crankshaft, the initial design according to the plunger force by the empirical formula to determine the crank pin, the main shaft size, and then determine the other size according to the structure needs. Then the strength check is performed and the static strength check and the fatigue strength check are performed at different positions according to the characteristics of the crankshaft. Finally check the stiffness.

The normal stress at the dangerous point on the cross section; T is the shear stress at the dangerous point on the dangerous section; the calculated safety factor; for the allowable safety factor, the fatigue strength check formula is usually taken as m is the bending and twisting alternating stress The crankshaft work safety factor is the crankshaft work safety factor under bending alternating stress; nT is the crankshaft work safety factor under the torsional alternating stress; Volmer et al. Linkage. Beijing: Mechanical Industry Press, 1989 R Beyer. Translated by Chen Zhaoxiong. Institutional kinematics synthesis. Beijing: Xiaochuan and Jia Tenggong from the machinery industry. Institutional science. Japan: Mori North Publishing Co., Ltd., 2(1)0 5 Li Xuerong. Link graph. Chongqing: Chongqing Publishing House, 1993 6 Li Zhen, Gui Changlin. The Mathematical Morphology Method of Linkage Curve Characteristic Analysis . Mechanical Engineering 7 Zhan Kuihua. Research on the Types, Distribution Rules and Shape Characteristics of Linkage Curves of Planar Crank and Rocker Mechanisms and Linkage Curve Map [Master's Thesis]. Suzhou: Suzhou University, 1993 8 Li Xuerong. The application of Bower's point and circle. Journal of Changsha Jiaotong University, 1998 9 Zhan Kuihua. Instantaneous pole synthesis method of four - link linear guide mechanism . Journal of Suzhou University 10 Zhan Kuihua . Study on Diameter of Connecting Rod Curve of Rocker Mechanism of Crank and Rocker . Suzhou Silk Institute of Technology

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