CN201408098Y - Strain tension tester for resistance of steel cable of curtain wall - Google Patents

Abstract

The utility model relates to a strain tension tester for the resistance of a steel cable of a curtain wall. The strain tension tester comprises a static strain measuring device, an A/D converter and adata processing and result display device, wherein the static strain measuring device comprises a left jig, a right jig and a differential variable resistance strain electrical bridge, and a strain sensor of the differential variable resistance strain electrical bridge is arranged between the left jig and the right jig; the data processing and result display device adopts a common computer to process the converted voltage signal, convert the voltage signal into the extension of the steel cable and display the processed result by analyzing the strain mathematical model of the steel cable. Thestrain tension tester for the resistance of the steel cable of the curtain wall can measure the tension of the steel cable of the curtain wall automatically, the operation is very convenient, and theerror is smaller.

Description

Curtain wall wire rope resistance-strain type tension tester

Technical field

The utility model relates to a kind of auto testing instrument of measuring the curtain wall wire rope pulling force.

Background technology

The patent No. is that the utility model patent of ZL200620065803.6 discloses the curtain wall wire rope strain-type tension tester of a kind of mechanical strain formula clock gauge as sensor, this tension tester comprises left and right sides anchor clamps, configuration push rod, left and right sides pressing mold and gland and as the mechanical strain formula clock gauge of sensor.Complete unit is fixed on the cable wire, can realize the measurement of cable wire loading process, measures and reacts very sensitive, but the clock gauge pointer that detects by an unaided eye changes, and record by hand, be easy to generate artificial deviation, also be not suitable for carrying out the robotization of the process measurement of curtain wall wire rope pulling force.

The utility model content

The purpose of this utility model provides a kind ofly can carry out process measurement automatically, manipulate the curtain wall wire rope resistance-strain type tension tester very convenient, that error is less.

To achieve these goals, the utility model curtain wall wire rope resistance strain measuring device comprises: three parts of static strain measuring instrument, A/D converter and data processing and device displaying result.The static strain measuring instrument comprises left and right sides anchor clamps, differential power transformation resistance strain bridge and differential amplifier, left and right sides anchor clamps are made of two clampings up and down, there is the V-type clip slot centre of two clampings up and down, and the xsect of clip slot is the isosceles triangle that drift angle is 100 degree, is equilateral rhombus after left and right sides anchor clamps are fixing; The strain transducer of differential power transformation resistance strain bridge places between the anchor clamps of the left and right sides.The static strain measurement mechanism is with the corresponding voltage signal of strain signal conversion.A/D converter is finished the conversion work of simulated data.Data processing and device displaying result carry out Specialty Design according to above method of testing, by to cable wire strain Analysis of Mathematical, will handle and be converted into the elongation of cable wire, the result of display process through the voltage signal of conversion.

The utility model curtain wall wire rope resistance-strain type tonometry method is as follows:

1. the curtain wall wire rope tension static strain is measured: strain transducer is installed on cable wire longitudinal stress position, makes up differential power transformation resistance strain bridge compensating circuit, realize the precision measurement of the faint variation of pair of strain sensors resistance.The strain transducer of static strain measurement mechanism-variable resistor R ' is installed on cable wire longitudinal stress position by left and right sides anchor clamps, by R ₁, R ₂, R ₃, R ₄, R ' and R ₁', R ₂', R ₃', R ₄' make up differential power transformation resistance strain bridge compensating circuit, realize the precision measurement of the faint variation of pair of strain sensors resistance.Its line construction is to adopt differential power transformation resistance strain bridge, adopts the half bridging line method, for example when cable wire generation elongation strain, and when the drive movable contact moves right, R ₁Increase Δ R ₁₁, R ₂Reduce Δ R ₁₂, and Δ R ₁₁=Δ R ₁₂Make Δ R ₁₁=Δ R ₁₂=Δ R by the strain bridge correlation formula, can get:

$\mathrm{\Δ}\stackrel{\·}{u}\≈{\frac{1}{4}\stackrel{\·}{u}}_0\frac{2\mathrm{\ΔR}}{R}\≈\frac{1}{2}{\stackrel{\·}{u}}_0\frac{\mathrm{\ΔR}}{R}=\frac{1}{2}{\stackrel{\·}{u}}_0{K}_1{K}_2\mathrm{\ϵ}---\left(1\right)$

In the formula,

ε---strain value (* 10 ^-6),

R---electric bridge arm resistance (Ω),

Δ R---the resistance change (Ω) that the invar line stretch causes,

K ₁---the sensitivity coefficient of strain measuring instrument,

K ₂---the enlargement factor of differential amplifier.

Cable wire is thought of as the Elastic Cylindrical body, obtains relation between voltage measuring value and the cable wire deformation tension force by hooke theorem:

W＝SEε (2)

In the formula:

W---the suffered pulling force of cable wire (N),

Cross-sectional area (the mm of S---cable wire ²),

The experience module of elasticity of E---cable wire, different materials and the diameter (N/mm that has nothing in common with each other ²).

From (1) formula as can be seen, such group bridge method, not only can reach the purpose of temperature self-compensation, but also can improve the output sensitivity of strain bridge, changing connection than half-bridge single armed is doubled, and can accomplish the output sensitivity normalization, utilize this to connect bridge characteristics and group bridge principle, can be with the group bridge method of general strain electrical measurement, can select for use the same model sensor more than two or two to form compound sensor, carry out the Automatic Combined of strain according to measurand, reduce measuring point and calculation analysis work amount, provide convenience for improving test job efficient and precision thereby reach.

2, the collection of curtain wall wire rope tension static strain data and Filtering Processing: consider that cable wire rocks the existence with torsion when strain measurement, be necessary the strain measurement data is carried out Filtering Processing.Specific practice is: in the single reinforcing, after treating that cable wire is in steady state (SS), cable wire measurement point strain value is carried out continuous 10 samplings, sampled data is carried out limit filtration and the processing of median average filter: at first reject and differ bigger unreasonable data with calculated value, remove a maximal value and a minimum value then, calculate the mean value of residue numerical value at last, as the sampled data of this time reinforcing.

3. different structure point type cable wire interface display: with different point type support operation interfaces such as color graphics interface display fish-bellied type curve, broken line type cable wire, self-equilibrating cable wire, horizontal cable wire rope nets.The user can be by the selected voluntarily point position of mouse action, and can the graphical interfaces mode shows the distortion and the stressed measurement result of measurement point.

4. the empirical parameter design that converts between strain and the pulling force: the various combination cable wire needs to adopt different empirical parameters when carrying out strain and stressed conversion.Therefore need be according to the different different empirical parameters of initial conditions design.

5. set up different model cable wire mechanics parameter database; Design is calculated the basis from φ 6-φ 30 cable wire cross-sectional areas, Young modulus, maximum length Database Systems for the automatic force analysis of cable wire provides.

6. carry out the analysis of different curtain wall wire rope structure stress: this module can be according to the strain measurement result, and the rete cord mechanics empirical parameter in calling module 3 and the module 4 automatically calculates the force analysis result of point type cable wire supporting construction automatically.

7. data storage and demonstration: the strain value that measures is preserved with the TXT file layout with the final tension analysis result who calculates, and can show corresponding the measurement and result of calculation simultaneously on graphical interfaces.

In case of necessity, data printout: mode that can test report is to the printer output test report.

Above measuring method is except 1, and other all are to utilize the data processing of Specialty Design and display device to finish.

Data processing and device displaying result can be achieved as follows function:

1, the empirical parameter design that converts between the strain of various combination cable wire and the pulling force;

2, calculate cable wire force analysis result;

3, the interface display of fish-bellied type curve, broken line type cable wire, self-equilibrating cable wire, horizontal cable wire rope net, measurement arrangenent diagram;

4, record imposed load and cable wire strain value, elongation;

5, set up the Young modulus and the sectional area database of cable wire;

6, access the Young modulus and the sectional area of cable wire automatically;

7, data storage, demonstration computational data and support printing function.

This curtain wall wire rope resistance strain measuring device, the process measurement that can carry out the curtain wall wire rope tension strain is automatically manipulated very conveniently, and error is less

Description of drawings

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is that the structure of left and right sides anchor clamps is cutd open figure.

Fig. 2 is that the anchor clamps user mode is cutd open figure.

Fig. 3 is the circuit diagram of differential power transformation resistance strain bridge.

Specific embodiments

In Fig. 1,2, left and right sides anchor clamps are made of two clampings 1 and 2 up and down, there is a V-arrangement clip slot 3 centre of two clampings up and down, the xsect of V-type clip slot is drift angle can be the isosceles triangle of 70-120 degree, the best is 100 degree, can make the contact area maximum of anchor clamps and curtain wall wire rope like this, hold the tightest.Be equilateral rhombus behind the anchor clamps secured curtain wall cable wire of the left and right sides.Other 4 is fastening screw select hole, and 6 is the strain transducer mounting hole.Among Fig. 25 is tested curtain wall wire rope.Because adopting drift angle is the isosceles V-type clip slot of 100 degree, changes the degree of depth of isosceles V-type clip slot, anchor clamps can press from both sides the various cable wires of cross-sectional area from φ 6-φ 30.Depth H as isosceles V-type clip slot is 3.5mm, and anchor clamps can press from both sides the various cable wires of cross-sectional area from φ 6-φ 12.The depth H of isosceles V-type clip slot is 7.83mm, and anchor clamps can press from both sides the various cable wires of cross-sectional area from φ 13-φ 20.The depth H of isosceles V-type clip slot is 12mm, and anchor clamps can press from both sides the various cable wires of cross-sectional area from φ 20-φ 30.

Among Fig. 3, differential power transformation resistance strain bridge is by R ₁, R ₂, R ₃, R ₄, R ' and R ₁', R ₂', R ₃', R ₄' make up differential power transformation resistance strain bridge compensating circuit, realize the precision measurement of the faint variation of pair of strain sensors resistance.The strain transducer of static strain measurement mechanism-variable resistor R ' is installed on cable wire longitudinal stress position by left and right sides anchor clamps, when cable wire generation elongation strain, and when the drive movable contact moves right, R ₁, R ₂Change,, measure the value of Δ ù,, just can draw the suffered tension force of curtain wall wire rope according to (1) formula and (2) formula with instruments such as potential difference meters.Connect data processing and device displaying result after the A/D conversion.

Claims (2)

1, curtain wall wire rope resistance-strain type tension tester is characterized in that this tester comprises static strain measurement mechanism, A/D converter and data processing and three parts of device displaying result; The static strain measurement mechanism comprises left and right sides anchor clamps, differential power transformation resistance strain bridge and differential amplifier, and the strain transducer of differential power transformation resistance strain bridge places between the anchor clamps of the left and right sides.

2, curtain wall wire rope resistance-strain type tension tester as claimed in claim 1, it is characterized in that left and right sides anchor clamps are made of two clampings up and down, there is a V-arrangement clip slot centre of two clampings up and down, and the drift angle of V-arrangement clip slot is 100 degree, is equilateral rhombus after left and right sides anchor clamps are fixing.

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