Research On The Transmission Mechanism Of The Separating Roller Of Cotton Combing Machine Based On One-way Mixed Input

Textile industry is the most important pillar industry of people's livelihood in our country.In order to promote the upgrading and transformation of the textile industry and transform our country from a big textile country to a powerful textile country,it is necessary to carry out technological innovation and technological breakthroughs in the textile industry.As the most important part of textile equipment,comber is the most important tool for upgrading fabric grade and producing special yarns.The detaching roller drive mechanism is one of the core mechanisms directly affecting the combing quality in the comber.Therefore,the research on detaching roller drive mechanism of comber is of great significance to the development of textile industry in China.At present,the mechanical drive mechanism of the detaching roller has a long transmission chain and a complicated structure.As the increase of comber speed,the components of the transmission mechanism produce greater impact and vibration,thus restraining the further increase of combing speed.At the same time,due to the limitation of the mechanical structure,the types of fibre bundles that are combed are single,its spinnability is poor,and the combing quality is unsatisfactory.For the scheme of servo motor drive detaching roller directly,the servo motor is required to reciprocate at high speed,and the motor power requirement is too large.Therefore,the existing mechanism seriously restricts the development of comber with high quality,flexibility and high speed.In view of the above problems,this paper proposes an innovative mechanism for unidirectional hybrid drive comber detaching roller.Firstly,the kinematic law of the detaching roller was studied.Based on the transmission mechanism combining the linkage mechanism and the differential gear train,the kinematics analysis is carried out to obtain the motion law curve of the existing detaching roller.Then the combing process is analyzed,and the calculation model of the key points in the process of detaching the roller movement is established.The results show that there is a deviation between the existing motion and process requirements of detaching roller.Therefore,the key points are optimized and fitted by the method of optimum design,and the detaching roller motion curve which fully meets the requirements of combing process is obtained.Secondly,the hybrid drive mechanism is designed and the reasonable power distribution is carried out.The planetary differential gear train is selected as the motion synthesis mechanism and kinematics analysis is carried out,and the conclusion that the servo one-way input can obtain the required output motion law is obtained.And its kinematics analysis is carried out.The results show that the required output motion law can be obtained by servo unidirectional input.On this basis,the schemes of "biased hybrid drive" and "parallel hybrid drive" are proposed,and the servo input of each scheme is allocated reasonably.By comparison,the hybrid drive scheme can reduce the acceleration of the servo motor,and the dynamic performance of the servo motor in the bias hybrid drive scheme is the best.Finally,the previous theoretical research results are verified and analyzed.Based on the virtual prototyping technology,the pre-dynamic power distribution scheme was verified,and the finite element analysis method was used to analyze the stress and strain of the key parts in the hybrid drive mechanism.Finally,the experimental verification was carried out on the experimental prototype.The results show that the design is reliable and reasonable,and the motion of detaching roller can accurately meet the combing process requirements under the suitable unidirectional driving conditions of servo motor.In this study,the hybrid drive theory is applied to the detaching roller drive mechanism of comber,which provides a new solution to the engineering technical problems encountered in the development of the comber at this stage,and provides a reference for the design of new combers with high efficiency and good spinnability.