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Variable load fatigue testing machine for small deformation parts

A fatigue testing machine and small deformation technology, applied in the direction of applying repetitive force/pulsation force to test the strength of materials, etc., can solve problems such as failure to meet ground anchor mechanics and deformation requirements, damage and other problems, and achieve the requirements of reducing manufacturing accuracy and eliminating The effect of itinerary matching

Inactive Publication Date: 2016-04-06
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the ground anchor is always small deformation during use, but long-term accumulation will also cause damage, the fatigue performance of the ground anchor must be verified before the radio telescope is installed
Existing variable load fatigue testing machines rarely have the ability to carry out large-scale fatigue experiments under small deformation conditions, and cannot meet the mechanical and deformation requirements of ground anchors

Method used

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  • Variable load fatigue testing machine for small deformation parts
  • Variable load fatigue testing machine for small deformation parts
  • Variable load fatigue testing machine for small deformation parts

Examples

Experimental program
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Effect test

Embodiment 1

[0026] like figure 1 , figure 2 Shown is one of the embodiments of the present invention. In this embodiment, the variable load fatigue testing machine used for small deformation parts is provided with a driving mechanism, and the driving mechanism drives the rotating disk 10 to rotate. The rotation center of the rotating disk 10 and itself The geometric centers of are coincident or not coincident, such as figure 1 The coincidence method is adopted in the method; the ground anchor 1 to be tested is fixed on the foundation, and the rotating disk 10 is connected to the ground anchor 1 to be tested through the connecting rod 7, the sliding rod 4, and the spring 3 connected in sequence, and the ground anchor 1 is periodically applied. Varying tension; a force sensor 2 is set between the tested ground anchor 1 and the spring 3 to detect the tension value of the ground anchor 1.

[0027] Since the spring 3 is deformable, the influence of small deformations of the ground anchor 1 ...

Embodiment 2

[0038] like image 3 , Figure 4 Shown is the second embodiment of the present invention, and the difference from embodiment 1 is that in this embodiment, the rotation center 16 of the rotating disk 10 does not coincide with its own geometric center 22, the rotating disk 10 is an eccentric structure, and the eccentric distance e, when the rotary disk 10 rotates once, the elongation of the spring 3 is x=2*e.

[0039] In this embodiment, the rotating disk 10 is provided with circular chute 21 with different diameters, and the pin shaft is connected to the connecting rod in the chute 21, and the minimum tension and maximum tension generated by the fatigue testing machine are set through different chute. ; The connecting rod and the sliding rod are integrally formed, forming image 3 The slide bar 4 in the slide bar 4 is provided with a guiding support seat 5, and the support seat 5 is provided with a guide hole, and the slide bar 4 moves up and down along the guide hole, and is...

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Abstract

The invention discloses a variable load fatigue testing machine for small deformed parts, which is provided with a driving mechanism, and the driving mechanism drives a rotating disk to rotate, and the rotation center of the rotating disk coincides with or does not coincide with its own geometric center; the ground to be tested The anchor is fixed on the foundation, and the rotating disk is connected to the tested ground anchor through connecting rods, sliding rods, and springs connected in sequence, and a periodically changing pulling force is applied to the ground anchor; The force sensor detects the tension value of the ground anchor.

Description

technical field [0001] The invention relates to a variable load fatigue testing machine for small deformation parts, in particular to a variable load fatigue testing machine for verifying the fatigue performance of radio telescope ground anchors. Background technique [0002] The 500-meter Aperture Spherical Radio Telescope (FAST) adopts innovative active reflector technology, and its surface shape is constantly changing to track signals, causing the ground anchor connected to the reflector unit to be subjected to constantly changing pulling forces for a long time, with a force value range of about 1 -10 tons, deformation about 1mm. According to the nature of the rock and soil, ground anchors are poured into the rock and soil in different forms. The design life of the FAST telescope is 30 years, and the fatigue life of the ground anchor is more than 500,000 times. This performance is an important guarantee for the normal operation of the telescope. [0003] Since the groun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/34
Inventor 古学东薛建兴王启明
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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