Since the knotters on the Chinese rectangular balers are imported from outside of the country, Chinese knotters with independent intellectual property rights is far away from being closed. In order to harvest a large ...Since the knotters on the Chinese rectangular balers are imported from outside of the country, Chinese knotters with independent intellectual property rights is far away from being closed. In order to harvest a large quantity of straw in a short period on the small-scale lands of China, basic requirements on the knotters are summarized. Mathematical model of the knotter is also determined uniquely. Furthermore, the ^-type-knots knotter equipped on the Chinese square baler to form the ~ type knots is designed. Knotting rate experiments of the qb-type-knots knotter on the test bench and in the wheat/maize straws covered fields are carried out to check the knotting performances of the knotter. The parameters of the formed knots are also tested. The experiments results show that the knotting rate of the qb-type-knots knotter reaches 100.0% on the test bench without straws, while reaches 99.6% in the wheat straws covered field and 100.0% in the maize straws covered field. The average maximum force in the knotting process is 194.7 N in the lab experiment. The length out of the knots formed in lab is 15.9%-20.6% lower than the knots formed in the field experiment. The breaking force of the knots formed in the field is 115.9%-167.2% higher than the knots formed in lab due to the higher preload and interactions with the compacted bales. Highly relevant relationships exist between the breaking force of the formed knots and the maximum force in the forming process of the knots in the lab experiment. The designed knotter breaks out the embarrassing situation of the domestic knotters which don＇t have independent intellectual property rights, and promotes the development of Chinese knotter technology, and the mathematical model is helpful for designing new type of knotters.展开更多
In order to solve the problem of poor working performance due to incidental picking-up loss of a spring-tooth drum pickup,the coupling analysis approach of Automated Dynamic Analysis of Mechanical Systems(ADAMS)and Di...In order to solve the problem of poor working performance due to incidental picking-up loss of a spring-tooth drum pickup,the coupling analysis approach of Automated Dynamic Analysis of Mechanical Systems(ADAMS)and Discrete Element Method(DEM)was proposed to reveal its motion characteristics.The coupled ADAMS-DEM method was used to construct the pickup simulation model with rice straw as the object.The validation tests were carried out in the field with different operating forward speeds and straw coverages.The results showed that when the baler worked with a rake,the straw loss rate tended to rise with the increase of the operating speed and the straw coverage.Tests results indicated periodic peaks and valleys of the forces between the rollers and the track chute,which could increase the wear of the track chute.In addition,the movement and variation of the straw and the distribution of different straw lengths after picking up were analyzed.The research results can provide a reference for the design and optimization of a pickup in the later period.展开更多
It is imperative to carry out research on residual plastic film collection technology to solve the serious problem of farmland pollution.The residual plastic film baler was designed as a package for film strip collect...It is imperative to carry out research on residual plastic film collection technology to solve the serious problem of farmland pollution.The residual plastic film baler was designed as a package for film strip collection,cleaning and baling.The collection device is a core component of the baler.Response surface analysis was used in this study to optimize the structure and working parameters for improving the collection efficiency of residual film and the impurity of film package.The results show that the factors affecting the collection rate of residual film and the impurity of the film package are the speed ratio(k)between the trash removal roller and eccentric collection mechanism,the number(z)and the mounting angle(θ)of spring teeth in the same revolution plane.For the collection rate,the importance of the three factors are in the order,k>z>θ.Meanwhile,for the impurity,the importance of three factors are in the order,z>k>θ.When the speed ratio,the mounting angle and the number of spring teeth was set at 1.6°,45°,and 8°,respectively,the collection rate of residual film was 88.9%and the impurity of residual film package was 14.2%for the baler.展开更多
基金supported by Program for Changjiang Scholars and Innovative Research Team in University of China(Grant No.IRT13039)National Natural Science Foundation of China(Grant No.51175499)+1 种基金Beijing Municipal Natural Science Foundation of China(Grant No.6112015)Chinese Universities Scientific Fund(Grant No.2012YJ091)
文摘Since the knotters on the Chinese rectangular balers are imported from outside of the country, Chinese knotters with independent intellectual property rights is far away from being closed. In order to harvest a large quantity of straw in a short period on the small-scale lands of China, basic requirements on the knotters are summarized. Mathematical model of the knotter is also determined uniquely. Furthermore, the ^-type-knots knotter equipped on the Chinese square baler to form the ~ type knots is designed. Knotting rate experiments of the qb-type-knots knotter on the test bench and in the wheat/maize straws covered fields are carried out to check the knotting performances of the knotter. The parameters of the formed knots are also tested. The experiments results show that the knotting rate of the qb-type-knots knotter reaches 100.0% on the test bench without straws, while reaches 99.6% in the wheat straws covered field and 100.0% in the maize straws covered field. The average maximum force in the knotting process is 194.7 N in the lab experiment. The length out of the knots formed in lab is 15.9%-20.6% lower than the knots formed in the field experiment. The breaking force of the knots formed in the field is 115.9%-167.2% higher than the knots formed in lab due to the higher preload and interactions with the compacted bales. Highly relevant relationships exist between the breaking force of the formed knots and the maximum force in the forming process of the knots in the lab experiment. The designed knotter breaks out the embarrassing situation of the domestic knotters which don＇t have independent intellectual property rights, and promotes the development of Chinese knotter technology, and the mathematical model is helpful for designing new type of knotters.
基金The authors acknowledge that this work was financially supported by the Collaborative Innovation Project of Anhui Colleges and Universities(Grant No.GXXT-2019-036)Anhui University Cooperation Collaborative Research Project(Grant No.GXXT-2020-011)Graduate Student Entrepreneurship Fund Program(Grant No.2020ysj-71).
文摘In order to solve the problem of poor working performance due to incidental picking-up loss of a spring-tooth drum pickup,the coupling analysis approach of Automated Dynamic Analysis of Mechanical Systems(ADAMS)and Discrete Element Method(DEM)was proposed to reveal its motion characteristics.The coupled ADAMS-DEM method was used to construct the pickup simulation model with rice straw as the object.The validation tests were carried out in the field with different operating forward speeds and straw coverages.The results showed that when the baler worked with a rake,the straw loss rate tended to rise with the increase of the operating speed and the straw coverage.Tests results indicated periodic peaks and valleys of the forces between the rollers and the track chute,which could increase the wear of the track chute.In addition,the movement and variation of the straw and the distribution of different straw lengths after picking up were analyzed.The research results can provide a reference for the design and optimization of a pickup in the later period.
基金This work was supported by Major Scientific and Technological Projects in Xinjiang Production and Construction Corps(2014AA002)the National Natural Science Foundation of China(31560336)the China Postdoctoral Science Foundation founded project(2015M572666XB).
文摘It is imperative to carry out research on residual plastic film collection technology to solve the serious problem of farmland pollution.The residual plastic film baler was designed as a package for film strip collection,cleaning and baling.The collection device is a core component of the baler.Response surface analysis was used in this study to optimize the structure and working parameters for improving the collection efficiency of residual film and the impurity of film package.The results show that the factors affecting the collection rate of residual film and the impurity of the film package are the speed ratio(k)between the trash removal roller and eccentric collection mechanism,the number(z)and the mounting angle(θ)of spring teeth in the same revolution plane.For the collection rate,the importance of the three factors are in the order,k>z>θ.Meanwhile,for the impurity,the importance of three factors are in the order,z>k>θ.When the speed ratio,the mounting angle and the number of spring teeth was set at 1.6°,45°,and 8°,respectively,the collection rate of residual film was 88.9%and the impurity of residual film package was 14.2%for the baler.
