Method for measuring spring stiffness of supporting and hanging frame online

A technology of spring stiffness and support and hanger, which is applied in the field of measurement, can solve problems such as loss of load, inability to adjust, overload of support and hanger, etc., and achieve the effect of simple and convenient data, fast measurement and accurate data

Inactive Publication Date: 2017-03-29
ZHEJIANG PROVINCIAL SPECIAL EQUIP INSPECTION & RES INST
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AI-Extracted Technical Summary

Problems solved by technology

Among them, in the long-term operation process, the gradual change of the spring stiffness of the support and hanger is a relatively hidden form of failure of the support and hanger, which will cause overload or loss of the support and hanger, and cannot be adjusted by adjusting the turnbuckle screw
The online measurement of the spring stiffness of the hanger is ...
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Method used

1) hang hoist on the steel frame structure of support hanger both sides, pipeline ...
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Abstract

The invention relates to a method for measuring the spring stiffness of a supporting and hanging frame online, and aims to provide a method which has the characteristics of fast measurement, accurate data and ability of being simple and convenient. The technical scheme is that the method for measuring the spring stiffness of the supporting and hanging frame online is implemented according to the following steps in sequence: 1) hoist cranes are hung on steel frame structures at two sides of the supporting and hanging frame, a pipeline is hoisted so as to enable the pipeline to break away from the supporting and hanging frame, and load influences imposed on the supporting and hanging frame by the pipeline are eliminated; 2) a strain gauge is attached at the position of a pull rod of the supporting and hanging frame; 3) the cranes are loosened so as to put the pipeline back to the supporting and hanging frame, strain data measured by the strain gauge is read, and the stroke of a spring is recorded at the same time; 4) a material and the section area of the pull rod are acquired according to data of the supporting and hanging frame; 5) the elasticity modulus of the pull rod is determined; and 6) the acquired variables are substituted into a formula.

Application Domain

Machine part testingElasticity measurement

Technology Topic

Elastic modulusStrain gauge +3

Image

  • Method for measuring spring stiffness of supporting and hanging frame online

Examples

  • Experimental program(1)

Example Embodiment

[0022] The present invention will be further described below in conjunction with the drawings.
[0023] figure 1 The support and hanger shown includes a support and hanger sleeve 3 fixed on a steel frame 8, a support and hanger tie rod installed in the support and hanger sleeve 1, a pressure block arranged on the top of the support and hanger tie rod, and The spring 2 at the lower end of the pressure block and the load F brought by the pipeline 7 act on the steel frame through the support and hanger rod, the spring and the support and hanger sleeve in turn.
[0024] In the present invention, a strain gauge 6 for measuring the strain of the tie rod is installed on the support and hanger rod. When the tie rod is stretched downward due to the weight of the pipeline, the strain gauge outputs and records the strain data of the tie rod. Both sides of the support and hanger sleeve are respectively equipped with a lifting hoist 5 installed on the steel frame for lifting the pipeline. The lifting hoists on both sides can lift the pipeline and eliminate the load caused by the pipeline on the support and hanger. influences. A scale 4 for recording the travel of the spring is arranged on the support and hanger sleeve.
[0025] The steps to measure spring stiffness are as follows:
[0026] 1) Hang the lifting hoist on the steel frame structure on both sides of the support and hanger, hoist the pipeline to eliminate the load impact of the pipeline on the support and hanger;
[0027] 2) Paste strain gauges at the position of the support and hanger rods;
[0028] 3) Loosen the hoist and put the pipe back on the hanger, read the strain data of the hanger measured by the strain gauge; meanwhile record the spring stroke;
[0029] 4) Obtain the material and cross-sectional area A of the tie rod through the support and hanger data;
[0030] 5) Measure the temperature of the tie rod to determine the elastic modulus E of the tie rod;
[0031] 6) Calculate the spring stiffness of the support and hanger based on the strain data, diameter, elastic modulus and spring stroke of the tie rod.
[0032] Measuring principle:
[0033] First, the elastic modulus of the tie rod is recorded as E, the cross-sectional area is A, and the spring stiffness is recorded as k.
[0034] Assuming that when the pipeline is hoisted with a hoist, the load on the support and hanger is F1, the strain of the tie rod is ε1, and the spring compression is x1, then for the spring:
[0035] F1=kx1;
[0036] For tie rods:
[0037] F1=ε1EA;
[0038] So there are:
[0039] kx1=ε1EA; (I)
[0040] Assuming that after the hoist is relaxed, the load on the support and hanger is F2, the strain of the tie rod is ε2, and the spring compression is x2, then for the spring:
[0041] F2=kx2;
[0042] For tie rods:
[0043] F2=ε2EA;
[0044] So there are:
[0045] kx2=ε2EA; (II)
[0046] From (I)-(II), we can get:
[0047] k(x1-x2)=(ε1-ε2)EA;
[0048] From this:
[0049] k=(ε1-ε2)EA/(x1-x2);
[0050] In the above formula, E and A can be obtained from the data of the support and hanger rod, ε1-ε2 is the strain of the rod measured by the strain gauge attached to the rod, and x1-x2 is the stroke of the spring. From this, the spring rate k can be calculated.
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