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Load-adjustable anti-loosening performance evaluation and detection device for electric power fasteners

A technology for detecting devices and fasteners, which is used in measuring devices, testing of machine/structural components, vibration testing, etc., which can solve the problem of short continuous working time, failure to reflect the dynamic change characteristics of clamping force, and failure to achieve continuous vibration times. Anti-loosening performance evaluation mode and other issues, to achieve the effect of accurate test results, reduced impact, and reduced interference

Inactive Publication Date: 2013-01-09
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test device is mainly a mechanical eccentric wheel structure driven by a motor. The size of the vibration load can only be adjusted by adjusting the driving radius (amplitude) of the motor. First, it is impossible to directly adjust and measure the size and waveform of the vibration load. Set the load according to the actual use conditions of the fastener connection and the change characteristics of the actual dynamic load during use
Second, the output of the clamping force change curve of the sample during the test is fixed-point sampling every second, which cannot reflect the dynamic change characteristics of the clamping force with the dynamic load
Third, the vibration test device driven by the motor is affected by the stress of the test piece and the friction during the transmission process during the working process, and the continuous working time is short (a few minutes), so it cannot achieve the prevention of "the number of continuous vibrations with complete loss of clamping force". loose performance evaluation model

Method used

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  • Load-adjustable anti-loosening performance evaluation and detection device for electric power fasteners
  • Load-adjustable anti-loosening performance evaluation and detection device for electric power fasteners
  • Load-adjustable anti-loosening performance evaluation and detection device for electric power fasteners

Examples

Experimental program
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Embodiment

[0034] Example: such as image 3 As shown, M18 bolts are selected for lateral vibration test with sine wave, 5Hz, and load of 10kN. First, fix the "test piece" screw to the "test screw" position, and fix it, and set the initial pre-tightening force (the initial pre-tightening force test is performed by the clamping sensor 10); second, according to the test requirements, in the Select the test mode (mode 1, 2 and 3) on the operation interface, and input parameters such as the waveform, frequency, amplitude and vibration times of the load at the same time. After starting up, the signal generator in the signal loop transmits the control signal to the servo controller, the servo controller drives the servo valve 18, and the servo linear actuator (that is, the servo cylinder 2) drives the piston rod and the connecting seat 4 for mechanical transmission, driving The test screw 8 on the movable pull plate 5 performs lateral reciprocating vibration. The initial pre-tightening force ...

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Abstract

The invention discloses a load-adjustable anti-loosening performance evaluation and detection device for electric power fasteners. The device comprises a vibration main unit, a servo hydraulic system, a microcomputer and an electrical control system, the vibration main unit comprises a frame and a servo oil cylinder connected on one side of the frame, a piston rod of the servo oil cylinder is connected with a force transducer, the force transducer is connected with a connecting seat and a pulling plate, a through hole for a testing screw to pass through is arranged in the middle of the pulling plate, and a support plate is connected on the other side of the frame and movably connected below the pulling plate. Vibration load of the anti-loosening performance evaluation and detection device can be adjusted according to practical application occasions and borne vibration load characteristics of the electric power fasteners, so that evaluation and detection for the anti-loosening performance of the fasteners in connection are achieved.

Description

technical field [0001] The invention relates to the field of vibration tests, in particular to a device for evaluating and detecting the anti-loosening performance of electric fasteners. Background technique [0002] In the main equipment composition of the power system, various forms of fastener connections are almost always used. In the assembly of major electrical equipment, considering the design life of the equipment and the characteristics of operation and maintenance within its life cycle, riveting and bolting are the most common fastening forms, and riveting is mostly used in electrical equipment that requires high electric field distribution. In some occasions, the application of bolted connection is more extensive. The anti-vibration ability of electrical equipment and the anti-loosening performance of fasteners are more prominent in the structure of transmission towers. [0003] Due to the characteristics of meteorology and geography, it is easy to cause gallopi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/02
Inventor 杨晓辉任欢阎东寇晓适卢明娄红玉杨威张博张宇鹏魏建林宋高丽郑豫生刘相霞
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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