Design and Parameter Optimization of an Air-Suction Jujube Picking and Conveying Device

Zhang, Xuejun; Bai, Shenghe; Jin, Wu; Yan, Junchi; Zeng-lu, Shi; Yu, Mengjie; Yuan, Panpan; Zhu, Xingliang

doi:10.13031/trans.13600

Cited by 8 publications

(8 citation statements)

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“…The pickup rate and impurity rate of the pneumatic jujube-collecting machine for dwarf and close cultivation systems developed by Zhang et al [10] were 96.41% and 1.54%, respectively. The pickup rate and impurity rate of the pneumatic jujube harvester After verification, the error between the experimental value and the theoretical optimization value of the model was found to be less than 8%.…”

Section: Discussionmentioning

confidence: 99%

“…The jujubes cannot be blown off; thus, the air velocity of the fan should be larger than the impurities and less than the critical velocity of the jujubes to meet the required wind force for cleaning [20]. The critical velocity of impurities is 3.4-5.6 m•s −1 , and that of jujubes is 27.13-34.28 m•s −1 , according to the literature [20][21][22]. Therefore, the YWF2E-300 axial flow fan with an air volume of 3300 m 3 •h −1 was selected on the basis of the critical velocity of the jujubes and impurities [23].…”

Section: Analysis Of Conditions Meeting the Requirements Of The Jujub...mentioning

confidence: 99%

“…The rupture force of jujubes is approximately equal to the yield pressure of jujubes, 147.5 N, and the elastic modulus is 0.16 Mpa. The approximate yield stress and compressive deformation of jujubes can be obtained from the above Equations ( 20) and (21). According to the analysis of the collision process of jujubes and the law of energy conservation, the energy of collision loss is…”

Section: Analysis Of Conditions Meeting the Requirements Of The Jujub...mentioning

confidence: 99%

“…Jujube pickers can be divided into the following two categories considering different harvesting principles: pneumatic and mechanical jujube pickers. Zhang et al [10] developed a pneumatic jujube harvester, in which the operator picks up the jujubes on the ground while holding a suction pipe. The suction chamber then cleans and separates the jujubes from impurities to complete the picking task.…”

Section: Introductionmentioning

confidence: 99%

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Design and Evaluation of a Mechanical Floor-Standing Jujube Picker

Zhou

Ding

et al. 2022

Agriculture

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The poor adaptability of existing harvesting machinery and low work efficiency is observed due to the low-level mechanized harvesting of Xinjiang jujube orchards. A mechanical floor-standing jujube picker was designed on the basis of the characteristics of the high fruit drop of the Xinjiang jujube harvest period. The machine can pick up the jujubes, which have been manually collected into strips on the ground. The structure and working parameters of the pickup device are determined in accordance with the pickup principle. The conditions for satisfying the picking operation were analyzed, and the range of motion speed ratio parameters to meet the pickup operation was obtained. Furthermore, the contact process of jujubes on the conveying and separating device was analyzed and studied; the factors affecting the collision damage and conveying the balance of jujubes were analyzed; and the basic structural parameters of the conveying and separating devices were determined. A mechanical floor-standing jujube picker was also fabricated for trial. A three-factor and three-level Box– Behnken test was performed by taking the forward speed of the machine, the speed of the strip brush roller shaft, and the hole pitch height of the profiling rod as factors, and the pickup, breakage, and impurity rates of jujubes as indicators. Results show that when the forward speed of the machine was 0.3 m·s−1, the speed of the strip brush roller shaft was 53 rpm and the hole pitch height of the profiling rod was 60 mm. The jujube pickup rate of the machine was 92.11%, the breakage rate was 2.07%, and the impurity rate was 4.15%. The relative error with the prediction model was less than 8%. Thus, the model is reliable and meets the operational requirements. This study can provide a reference for the mechanical floor-standing jujube picker.

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Section: Discussionmentioning

confidence: 99%

Section: Analysis Of Conditions Meeting the Requirements Of The Jujub...mentioning

confidence: 99%

Section: Analysis Of Conditions Meeting the Requirements Of The Jujub...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and Evaluation of a Mechanical Floor-Standing Jujube Picker

Zhou

Ding

et al. 2022

Agriculture

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“…The 3D structure of the collection devices is illustrated in Figure 3. Dandelion seeds with pappi detach from plants after being disturbed by the disturbing roller and then collect to the collection cover using negative-pressure blowers, thus completing their collection [17,18]. The design solves problems of difficulty collecting dandelion seeds with pappi, high labor intensity, and low harvesting efficiency.…”

Section: Design Of the Collection Devicesmentioning

confidence: 99%

Design and Testing of a Self-Propelled Dandelion Seed Harvester

Shao

et al. 2023

Agriculture

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At present, there are few harvesters for dandelion (Taraxacum mongolicum) seeds, which limits the large-area planting of dandelion. Furthermore, manual harvesting is characterized by huge labor intensity, low efficiency, and high costs. Combining the material characteristics of dandelion plants and seeds with agronomic requirements for harvesting dandelion seeds, a self-propelled dandelion seed harvester was designed. The harvester is mainly composed of collection devices, separation devices, transmission devices, and a rack. It can facilitate seed collection from plants, seed transportation, and seed–pappus separation in one operation. The collection and separation processes of dandelion seeds were studied to ascertain the main factors that affect the collection rate. Then, the collection and separation devices were designed, and their parameters were analyzed. Taking the forward speed, wind velocity of blowers, and rate of rotation of the drum as test factors and the collection rate as the evaluation index, quadratic regression orthogonal rotating field tests were performed. In this way, the optimal combination of operation parameters was determined: the collection rate is optimal when the forward speed is 0.8 m·s−1, the air velocity from the blowers is 1.63 m·s−1, and the rate of rotation of the drum is 419 rpm. Field test results showed that a favorable harvesting effect was achieved after operation of the harvester, and only small amounts of dandelion seeds remained unharvested. Under the optimal parameter combination, the collection rate reached 89.1%, which could meet requirements for practical field harvesting of dandelion seeds. The test results satisfy the design requirement.

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