scholarly journals DESIGN AND TEST OF NEGATIVE PRESSURE CHAMBER ROTARY BUCKWHEAT SEED METERING DEVICE

2021 ◽  
pp. 185-194
Author(s):  
Shaobo Ye ◽  
Decong Zheng ◽  
Wei Li ◽  
Qi Lu ◽  
Yuanqing Yang ◽  
...  
Keyword(s):  
Negative Pressure ◽  
Rotation Speed ◽  
Pressure Chamber ◽  
Technical Requirements ◽  
Air Chamber ◽  
High Power Consumption ◽  
Surface Test ◽  
Pressure Suction ◽  
Seed Metering Device ◽  
Suction Hole

A negative pressure chamber rotary precision seed metering device was designed to achieve the buckwheat precision sowing goal, solving the problems of traditional negative pressure chamber poor sealing and air suction seed metering device high power consumption. The planting plate of the device was fixedly connected with the shell of the air chamber forming a negative pressure chamber, which rotates around an axis. A planting plate suitable for buckwheat seed metering was designed. Single factor test and response surface test were carried out on the seed metering device. Results showed that the buckwheat precision seed metering achieved best performance when the negative pressure, suction hole diameter and rotation speed was 2.4 kPa, 2.0 mm and 25 r/min respectively. The qualified index, multiples index and miss-seeding index were respectively 88.32%, 7.35%, and 4.33%, which met the technical requirements of buckwheat precision sowing. The results of the study provided references for the design and application of buckwheat precision seed metering device.

scholarly journals EXPERIMENTAL STUDY ON AIR FLOW FIELD CHARACTERISTICS OF SUCTION METERING DEVICE

2021 ◽  
pp. 57-66
Author(s):  
Meng Zhang ◽  
Zeqi Liu ◽  
Yajun Zhuang ◽  
Jie Han ◽  
Yin Xiang ◽  
...  
Keyword(s):  
Flow Field ◽  
Negative Pressure ◽  
Gas Flow ◽  
Vacuum Chamber ◽  
Air Flow ◽  
Test Bed ◽  
Seed Metering Device ◽  
Suction Hole ◽  
Hole Structure ◽  
Gas Flow Field

The vacuum seed metering device absorbs seeds by using the negative pressure generated by vacuum air flow. Therefore, it is of great significance to study the variation law of pyrolysis gas flow field to improve its seed metering performance. In this paper, the common disc and composite disc were selected as the research objects and tested on the indoor test-bed. The negative pressure was measured by U-type barometer, and the effects of fan speed, suction hole size, seed hole structure and air chamber thickness on the air flow field were studied. Firstly, the influence of fan rotation frequency on vacuum chamber negative pressure is studied, and the variation law of negative pressure in vacuum chamber and fan port of common disc and composite disc under the same frequency is compared. Secondly, the suction holes in the vacuum chamber were numbered, the negative pressure distribution of the suction holes was measured, and the influence of the number and diameter of the suction holes on the negative pressure of the vacuum chamber was studied. Finally, the negative pressure was measured at the distance of 0 to 10 mm from the suction hole to study the effect of seed hole structure on the air flow field. Moreover, increase the additional thickness of the vacuum chamber from 0 to 40 mm to study the influence of the chamber thickness on the distribution of the gas flow field. This paper makes a comprehensive experimental analysis on the influencing factors of air flow field of air suction seed metering device, necessary for future design of air suction seed metering device.

scholarly journals EFFECT OF SEED FILLING AND RELEASING ANGLES ON THE PERFORMANCE OF COMPOUND VACUUM SEED METERING DEVICE

2021 ◽  
pp. 153-162
Author(s):  
Zeqi Liu ◽  
Zhang Meng ◽  
Jie Han ◽  
Yajun Zhuang ◽  
Xiang Yin ◽  
...  
Keyword(s):  
Negative Pressure ◽  
High Speed ◽  
Test Results ◽  
Camera System ◽  
Seed Filling ◽  
Evaluation Indexes ◽  
Air Chamber ◽  
The Subject ◽  
Seed Metering Device

In this paper, taking compound air-suction seed metering device as the subject, the effect rule of seed filling angle and seed releasing angle on the performance of seed filling and seed metering is studied. An indoor test was conducted with a JPS-12 metering test bench and a high-speed camera system. The starting and ending angles of the air chamber were changed by adjusting the regulating plate, that is, the angles of seed filling and seed releasing, and the filling and seed metering performance was taken as evaluation indexes. The test results show that: the seed filling angle has significant effect on the seed filling effect, and the miss fill index decreases with the increase of the quality of fill index. When the seed filling angle exceeds 50°, they will stabilize gradually ending at the multiple fill index of 0%. The negative pressure and operating speed are interactive and have a significant effect on filling performance. The seed releasing angle has significant effect on the metering performance. With the increase of the angle, the quality of feed index increases firstly and then decreases. The multiple index and miss index are opposite to the quality of feed index which is the max at the seed releasing angle of 39.5°. The negative pressure and forward speed are interactive and have a significant effect on metering performance. The quality of feed index under the same condition is lower than that of fill index.

scholarly journals Lung Injury Resulting from Fluted Silastic Soft Drain Extraction under Negative Pressure Suction*

2013 ◽  
Vol 03 (03) ◽  
pp. 73-75
Author(s):  
Susumu Isoda ◽  
Tamizo Kimura ◽  
Kenji Nishimura ◽  
Nozomu Yamanaka ◽  
Shingo Nakamura ◽  
...  
Keyword(s):  
Lung Injury ◽  
Negative Pressure ◽  
Pressure Suction

DEVELOPMENT OF NEGATIVE PRESSURE SUCTION MECHANISM IN OMNIDIRECTIONAL WALL-CLIMBING ROBOT FOR INSPECTION OF AIRPLANES

2016 ◽  
pp. 106-114 ◽  
Author(s):  
TOMOHIRO YAMAGUCHI ◽  
TAKAFUMI AMAKAWA TETSUHIDE GO ◽  
YASUYUKI YAMADA ◽  
TARO NAKAMURA
Keyword(s):  
Negative Pressure ◽  
Climbing Robot ◽  
Pressure Suction

EUS-guided fine needle tissue acquisition by using high negative pressure suction for the evaluation of solid masses: a pilot study

2005 ◽  
Vol 62 (5) ◽  
pp. 768-774 ◽  
Author(s):  
Alberto Larghi ◽  
Amy Noffsinger ◽  
Charles E. Dye ◽  
John Hart ◽  
Irving Waxman
Keyword(s):  
Pilot Study ◽  
Negative Pressure ◽  
Fine Needle ◽  
Tissue Acquisition ◽  
Pressure Suction ◽  
High Negative Pressure

scholarly journals Cardiac Arrest after Connecting Negative Pressure to the Subgaleal Drain during Craniotomy Closure

2014 ◽  
Vol 2014 ◽  
pp. 1-3 ◽  
Author(s):  
Monu Yadav ◽  
Sapna A. Nikhar ◽  
Dilip Kumar Kulkarni ◽  
R. Gopinath
Keyword(s):  
Cardiac Arrest ◽  
Negative Pressure ◽  
Surgical Procedure ◽  
Vacuum System ◽  
Suction Drain ◽  
Pressure Application ◽  
Neurosurgical Patients ◽  
One Year ◽  
Pressure Suction ◽  
Subgaleal Space

A one-year-old child operated on for arachnoid cyst in right frontoparietotemporal region had sudden bradycardia followed by cardiac arrest leading to death after connecting negative pressure to the subgaleal drain during craniotomy closure. The surgical procedure was uneventful. It is a common practice to place epidural or subgaleal drains connected to a vacuum system towards the end of craniotomy to prevent accumulation of intracranial and extracranial blood. The phenomenon of bradycardia with hypotension is known to occur following negative pressure application to the epidural, epicranial, or subgaleal space after craniotomy closure. However cardiac arrest as a complication of negative pressure suction drain in neurosurgical patients is not described in the literature.

scholarly journals Study on Negative-pressure Precision Millet Seed-metering Device

2015 ◽  
Vol 7 (2) ◽  
pp. 139-143
Author(s):  
Huali Yu ◽  
Xiaoshun Zhao ◽  
Zhanliang Liu ◽  
Xiong Du ◽  
Cong Tian
Keyword(s):  
Negative Pressure ◽  
Millet Seed ◽  
Seed Metering Device

Fingertip Force Displaying Device Using Pneumatic Negative Pressure

2014 ◽  
Vol 8 (2) ◽  
pp. 208-215 ◽  
Author(s):  
Masahiro Takaiwa ◽  
◽  
Toshiro Noritsugu ◽  
Daisuke Sasaki ◽  
Takahiro Nogami ◽  
...  
Keyword(s):  
Negative Pressure ◽  
Mechanical Impedance ◽  
Display Device ◽  
Fingertip Force ◽  
Air Chamber ◽  
Web Camera

In this study, a fingertip force display device that uses negative pressure is developed. The device can control the resisting force against a finger’s motion by regulating the negative pressure in an air chamber processed in the device. Information about the position of a finger is obtained with a Web camera using AR-Toolkit library, and the resisting force is controlled based on the fingertip position (velocity), which shows the capability of the VR-oriented application and mechanical impedance task. The effectiveness of the proposed system is verified through experiments.

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