Design and Optimization of a New Type of the Back Pressure Reducing Back-lifting Mechanism

Pan Ao; Yu Chengtao; Sun Xuebin; Huang Guangming; Zhou Xiangyu

doi:10.16578/j.issn.1004.2539.2024.07.010

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Design and Optimization of a New Type of the Back Pressure Reducing Back-lifting Mechanism

Design· Calculation | 更新时间：2024-07-22

- Design and Optimization of a New Type of the Back Pressure Reducing Back-lifting Mechanism
- Journal of Mechanical Transmission Vol. 48, Issue 7, Pages: 76-84(2024)
- 作者机构：
  
  江苏理工学院机械工程学院，江苏常州 213001
- 作者简介：
- 基金信息：
- DOI：10.16578/j.issn.1004.2539.2024.07.010
  CLC：
- Published：15 July 2024，
  
  Received：08 May 2023，
  
  Revised：21 July 2023，
- 稿件说明：
扫描看全文
潘澳,俞成涛,孙学斌等.新型可减小压背感的抬背机构设计与优化[J].机械传动,2024,48(07):76-84.

Pan Ao,Yu Chengtao,Sun Xuebin,et al.Design and Optimization of a New Type of the Back Pressure Reducing Back-lifting Mechanism[J].Journal of Mechanical Transmission,2024,48(07):76-84.
潘澳,俞成涛,孙学斌等.新型可减小压背感的抬背机构设计与优化[J].机械传动,2024,48(07):76-84. DOI： 10.16578/j.issn.1004.2539.2024.07.010.

Pan Ao,Yu Chengtao,Sun Xuebin,et al.Design and Optimization of a New Type of the Back Pressure Reducing Back-lifting Mechanism[J].Journal of Mechanical Transmission,2024,48(07):76-84. DOI： 10.16578/j.issn.1004.2539.2024.07.010.

摘要

为解决护理床抬背过程中给使用者造成的压背感问题，创新性地设计了一种可联动腰板的新型抬背机构。首先，利用多连杆机构，在抬背过程中实现腰板的联动，填补了抬背过程中腰部的三角悬空区域，从而可为腰部提供支撑、减少压背感；在起背状态时，抬起的腰板充当靠垫，更加符合坐起状态下的人体工程学要求；结合人体尺寸参数，对新型抬背机构与传统抬背机构的背部受力进行分析对比，验证说明新型抬背机构可减少压背感；其次，对抬背机构进行运动学理论分析，并且进行参数化建模，以背板角加速度最大值最小为优化目标进行了尺寸优化设计。然后，对机构进行动力学仿真，得到运动过程中受力最大值，导入Ansys中进行静力学仿真，验证了抬背机构的安全稳定性。最后，进行了样机试验，通过角度传感器验证了背板抬起角度以及抬背过程中的平稳性。

Abstract

In order to solve the problem of back pressure caused by the nursing bed during the back lifting process

a new type of back lifting mechanism that can link with the waist plate is innovatively designed. Firstly

the multi-link mechanism is used to realize the linkage of the waist plate during the back lifting process

and the triangular suspended area generated in the waist part during the back lifting process is filled

so as to provide support to the waist and reduce the back pressure. When the back is lifted

the raised waist plate acts as a cushion

which is more in line with the ergonomic requirements under the sitting state. Combined with the parameters of the body size

the back forces of the new back lifting mechanism and the traditional back lifting mechanism are analyzed and compared

and it is verified that the new back lifting mechanism can reduce the back pressure feeling. In addition

the kinematics analysis of the back lifting mechanism is executed

and the parametric modeling is carried out. Meanwhile

the size optimization design is carried out with the minimization of the maximal angular acceleration of the back plate as the optimization objective. Then

the dynamic simulation of the mechanism is carried out to obtain the maximum force in the movement process

which is imported into Ansys for statics simulation to verify the safety and stability of the back lifting mechanism. Finally

a prototype testing is conducted to verify the lifting angle of the back plate and the smoothness during the lifting process through an angle sensor.

关键词

多杆机构抬背机构压背感尺寸优化运动学分析有限元分析样机试验

Keywords

Multi-link mechanismBack lifting mechanismBack pressureSize optimizationKinematic analysisFinite element analysisPrototype test

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