(1) The virtual displacement principle is used to calculate the thrust value of the hydraulic cylinder during the ascent of the scissor lift platform. According to the different boundary conditions, three methods are used to calculate the thrust of the hydraulic cylinder. The calculated results are compared with the measured results, the appropriate calculation method is determined and the maximum thrust and the state of the stationary scissor lifting platform at the maximum thrust are obtained.
(2) On the basis of obtaining the maximum thrust of the hydraulic cylinder, the bottom-up and top-down methods of the ideal model of the stationary scissor arm are used to calculate the hinge point force of each scissor arm, and the results are compared and analyzed to determine that it is reasonable The calculation method and the corresponding hinge point force value are obtained; the hinge point force is recalculated under the state of considering the slider friction and eccentric load, and the calculation result is compared with the hinge point force value of the ideal model to verify the slider The influence of friction and eccentric load on hinge force.
(3) Use SolidWorks drawing software to build a three-dimensional model of the dangerous wishbone. Import the three-dimensional model into Workbench to calculate the stress under the normal state and the maximum eccentric load state. According to the calculation results, it can be seen that the strength in the two states meets the requirements; the shear fork is modified according to the orthogonal experiment principle and the industry standard of the rectangular tube The cross-section size of the arm and the thickness of the reinforcing plate are used to calculate the stress of the scissor arm under different sizes. The orthogonal test method is used to determine the largest factor affecting the stress of the scissor arm, which provides a basis for the design and optimization of the scissor lift platform.
(4) Establish the anti-overturning stability model of the scissor lift platform in two states, carry out horizontal load test tests on the two models, and use the stability coefficient method to verify that the anti-overturning stability of the lifting platform in the two states meets the requirements; adopt The instantaneous center method deduces the relationship between the expansion speed of the hydraulic cylinder and the speed of the lifting platform, and plots the change curve of the lifting platform speed during the ascent process. ; Calculate the bending deflection of each scissor arm in the normal state and the eccentric load state, and use Workbench to calculate the offset caused by the moment under the eccentric load. The deflection of each scissor arm in the normal state and the lateral offset of the lifting platform in the normal state are used as the lateral deflection of the lifting platform in the eccentric load state and the deflection of each fork arm and the torque generated in the eccentric load state. The amount of displacement, verify that the lateral offset of the lifting platform in the two states meets the national standard.
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