The Design of Screw-Drive Mechanism for Testing Device

2012 ◽  
Vol 271-272 ◽  
pp. 1206-1210
Author(s):  
Ying Jie Tan ◽  
Chang Ming Zhang
Keyword(s):  
Test Sample ◽  
Testing Device ◽  
Test Device ◽  
Main Structure ◽  
Drive Mechanism ◽  
Screw Drive ◽  
Actual Production ◽  
Pressure Test

The main structure of bearing frame for pressure test device and it’s functions are described in this paper. For the pressure test device with float collar and float shoe, the screw transmits movement with standing pressuring load. According to the needs of actual production and the requirements of test sample pressuring, this paper designed a drive mechanism for screw rod, calculated the stress and checked the correlated stiffness. The result shows that it is reasonable, safe and reliable for screw-drive mechanism, depending on the operation behavior of float collar and float shoe pressure test device.

Enzyme-Linked Immunosorbent Assay of Total Aflatoxins B1, B2, and G1 in Corn: Follow-up Collaborative Study

1994 ◽  
Vol 77 (3) ◽  
pp. 655-658 ◽  
Author(s):  
Mary W Trucksess ◽  
Michael E Stack
Keyword(s):  
Immunosorbent Assay ◽  
Polyclonal Antibodies ◽  
Collaborative Study ◽  
Screening Method ◽  
Test Sample ◽  
Enzyme Linked Immunosorbent Assay ◽  
Test Device ◽  
Total Aflatoxin ◽  
Peroxidase Conjugate

Abstract A direct competitive enzyme-linked immunosorbent assay screening method for af latoxins at 20 ng/g in corn was studied by 15 collaborating laboratories. Test samples of corn were extracted by blending with methanol-water (8 + 2). The extracts were filtered and the filtrates were diluted with buffer to a final methanol concentration of <30%. Each diluted filtrate was applied to a test device containing a filter with immobilized polyclonal antibodies specific to aflatoxins B1, B2, and G1. Aflatoxin Bi-peroxidase conjugate was added, the test device was washed with water, and a mixture of hydrogen peroxide and tetramethylbenzidine was added. A test sample was judged to contain ≥20 ng af latoxins/g when, after exactly 1 min, no color was observed on the filter; if a blue or gray color developed, the test sample was judged to contain <20 ng aflatoxins/g. All laboratories correctly identified naturally contaminated corn test samples. Only one false positive was found for controls containing no aflatoxins. The correct responses for positive test samples spiked at levels of 10,20, and 30 ng aflatoxins/g (the ratio of B1:B2:G1 was 15:1:3) were 67,97, and 100%, respectively. This method was adopted first action by AOAC INTERNATIONAL as a change in method for 990.34 for screening for aflatoxins B1, B2, and G1 in corn at total aflatoxin concentrations of ≥20 ng/g.

scholarly journals Design of ultrasonic testing device for fatigue damage of pressure vessels

2018 ◽  
Vol 232 ◽  
pp. 04088
Author(s):  
Wenchao LU ◽  
Huibin YANG ◽  
Juan YAN ◽  
Chengbo KANG
Keyword(s):  
Damage Detection ◽  
Fatigue Damage ◽  
Ultrasonic Testing ◽  
Detection System ◽  
Pressure Vessels ◽  
Ultrasonic Nondestructive Testing ◽  
Testing Device ◽  
Test Device ◽  
Detection Technology ◽  
Device Research

The container fatigue damage detection device is researched and designed for the fatigue damage detection requirements of pressure vessels. The hardware design of the detection device, the corresponding detection technology and the functions realized are introduced. The new test performs ultrasonic nondestructive testing by driving five DC servo motors to drive the mechanical part of the test device. Research on the detection system and technology to automate the detection of fatigue damage in pressure vessels.

scholarly journals Testing of dynamic wrist joint external fixator mobility and reaction moment

2018 ◽  
Vol 4 (1) ◽  
pp. 447-448
Author(s):  
Heiner Martin ◽  
Michael Stiehm ◽  
Ingmar Rinas ◽  
Niels Grabow ◽  
Thomas Mittlmeier
Keyword(s):  
External Fixator ◽  
Rotation Axis ◽  
Wrist Joint ◽  
Testing Machine ◽  
Load Cell ◽  
Testing Device ◽  
Test Device ◽  
Artificial Bones ◽  
Joint Loads ◽  
Wrist Joints

AbstractFor the investigation of reaction moments of wrist joint with external fixator, a test device was developed that allows a well-defined investigation of the joint loads during hand flexion movements. The reaction moments are considered as a measure for the joint loads due to the constraint forces, which occur with differences of the rotation axis of the fixator device from the physiological rotation axis of the wrist joint. The developed test device allows a dynamic momentum load application into the wrist by a servohydraulic testing machine. This testing device converts the force to a moment by a constant lever arm and allows thereby the measurement of the reaction moments by the force load cell of the testing machine. Measurements on cadaveric wrist joints with external fixator can be thereby performed under reproducible conditions. The cadaveric wrist joints can be integrally casted into bone cement and thereby clamped to the testing device. Preliminary experiments with artificial bones showed that forces within the measuring range of the load cell of the testing machine can be measured. The design of the test device is presented. Hence, the requirements for measurements of the reaction moments with wrists with external fixator for distal radius fractures under dynamic loads are created.

Transpirational Performance of Oriented Porous SiC Transpiration Cooling Materials

2008 ◽  
Vol 368-372 ◽  
pp. 837-839
Author(s):  
Jie Tang ◽  
Yu Feng Chen ◽  
Ji Guo Sun ◽  
Hua Wang ◽  
Hai Lin Liu
Keyword(s):  
Casting Process ◽  
Test Sample ◽  
Electric Arc ◽  
Thermal Testing ◽  
Testing System ◽  
Transpiration Cooling ◽  
Cooling Efficiency ◽  
Testing Device ◽  
Testing Period ◽  
Porous Sic

The application and the transpirational behavior of oriented porous SiC as transpiration cooling materials in a simulating test were studied. The test sample was shaped by freeze-casting process and reaction sintered. The testing device was composed by an electric arc combustor and a hydrogen coolant providing system. It was found that the permeability, the amount of coolant required and the uniformity of coolant infiltration were all effected by the microstructure of porous SiC, which furthermore influced the cooling efficiency of the testing system. In this test, the inner face temperature of the combustion chamber was maintained less than 400K throughout the thermal testing period contrasting with the fire temperature up to 3600K by the utilization of oriented porous SiC transpiration cooling materials.

Control of a Snake-like Robot Using the Screw Drive Mechanism

2007 ◽  
Author(s):  
Masaya Hara ◽  
Shogo Satomura ◽  
Hiroaki Fukushima ◽  
Tetsushi Kamegawa ◽  
Hiroki Igarashi ◽  
...  
Keyword(s):  
Drive Mechanism ◽  
Screw Drive

Research on a New Nanohardness Test Device

2007 ◽  
Vol 10-12 ◽  
pp. 533-537
Author(s):  
Qiang Liu ◽  
Ying Xue Yao ◽  
L. Zhou
Keyword(s):  
Single Crystal ◽  
Indentation Depth ◽  
Displacement Measurement ◽  
Displacement Curve ◽  
Testing Device ◽  
Test Device ◽  
Main Method ◽  
Indentation Experiment ◽  
Load Displacement ◽  
Depth Sensitivity

Nanoindentation has become the main method to obtain the micro- characteristic of materials by now. Nanoindentation device has the ability to make the load-displacement measurement with sub-nanometer indentation depth sensitivity, and the nanohardness of the material can be achieved by the load-displacement curve. The article discusses a new convenient nanohardness testing device, and approves its practicability and reliability by taking the indentation experiment on single-crystal aluminum.

Development of High-Pressure Gas Test System

2013 ◽  
Vol 278-280 ◽  
pp. 873-877
Author(s):  
Guang Zheng Jia ◽  
Jin Cai Geng ◽  
Yong Ling Fu
Keyword(s):  
High Pressure ◽  
Test System ◽  
Configuration Software ◽  
Programmable Logic ◽  
Gas Generator ◽  
Test Device ◽  
Nitrogen Gas ◽  
Pressure Test ◽  
Sealing Pressure ◽  
And Control

Abstract. The high-pressure gas test system was developed, which consists of a 0.9 MPa compressor, a nitrogen gas generator, a 15.0MPa compressor, a 35.0MPa gas booster, a gas flowrate device and a sealing pressure test device. “Sensor+PLC+Computer+ Configuration Software” as data acquisition and control model is adopted in the test system. The results prove that the configuration software can combine with PLC (Programmable Logic Controller) to perform many functions such as automatic monitor, respective automatic or manual control, displaying, recording and saving the test data and curves. The monitor and control system is running with perfect stability and reliability.

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