CN204902899U - Lotion pipe -line transportation flow measuring device - Google Patents

Abstract

The utility model relates to a lotion pipe -line transportation flow measuring device, the device include lotion duct survey section and is needing two foil gages that the assigned position is pasted of measuring lotion pipeline, and four foil gages are pasted to every assigned position, and four foil gages are located four position of the upper and lower left and right sides of pipeline assigned position respectively, and two assigned positions are located respectively apart from pipeline crossing 50m department with apart from pipeline crossing 100m department.

Description

A kind of lotion Cemented filling flow measurement device

Technical field

The utility model belongs to the field of measuring technique of coal mine paste filling Cemented filling flow.

Background technology

The coal mine paste filling Cemented filling flow-measuring method applied at present has alpha ray mensuration.The method is by detecting the radioactive particle thus acquisition Cemented filling flow of inserting in lotion conveyance conduit.The method test result is relatively accurate, but radioactive particle application is restricted, proving installation complex structure, high cost, operating difficulties, and is not suitable for general commercial Application.

The conditional request of device to Test Field of measuring channel feed flow of the prior art is higher; Determining instrument instrument is difficult to install according to codes and standards sometimes, thus paste filling pipe feed flow accuracy of measurement is reduced, and can not meet the precise requirements of detection; Meanwhile, their use all has limitation, and versatility is poor.

This device improves survey pipeline pressure on the basis of flowmeter method, and have good versatility, measuring accuracy is high, easy for installation, is easy to operation.When application traffic meter method surveys Paste Backfilling With Piping feed flow, the Cemented filling flow degree of accuracy of gained is lower, and this device surveys the pressure differential of conveyance conduit by application foil gauge, then according to the relational expression of pressure differential and flow, then obtain Cemented filling flow, make acquired results more accurate.

Resistance strain plate is adopted in this device, this resistance strain plate is when metallic resistance silk tension or pressurized, and the length of resistance wire and cross-sectional area will change, and the resistivity of resistance wire also changes, therefore the resistance value of wire changes, and the computing formula of resistance value is:

R＝ρ×L÷S(1)

In formula, the resistivity (Ω cm2/m) of ρ---metallic conductor

Sectional area (the cm of S---conductor ²)

The length (m) of L---conductor

The resistance strain plate adopted in this device also can be chosen as diaphragm type foil gauge, and for diaphragm type foil gauge, wherein, the strain of its center maximum radial equals maximum axial strain, is shown below:

${\mathrm{\ϵ}}_{r\max }={\mathrm{\ϵ}}_{t\max }=\frac{3p}{{8h}^{2}E}(1-{\mathrm{\μ}}^2){r_0}^2---\left(2\right)$

The strain of diaphragm edge smallest radial and maximum axial strain are shown below:

${\mathrm{\ϵ}}_{r\min }=-\frac{3p}{{4h}^{2}E}(1-{\mathrm{\μ}}^2)r^2,{\mathrm{\ϵ}}_{t\max }=0---\left(3\right)$

Position shown in such as formula (4), radial strain is 0.

$x=a=\frac{r}{\sqrt{3}}\≈0.58r$ Place: ε _r=0 (4)

In formula: p---by measuring pressure;

H---diaphragm thickness;

E---elastic modulus;

μ---Poisson ratio;

R ₀---diaphragm radius.

The temperature compensation of foil gauge, temperature variation causes the change of the resistance of foil gauge own, and computing formula is such as formula shown in (5).

ΔR _T＝Rγ _fΔT(5)

In formula: Δ R _t---the increased resistance value that temperature variation causes;

γ _f---the temperature-coefficient of electrical resistance of metal strain plate;

Δ T---the temperature variation number of degrees.

Being converted to strain value by the change of this resistance value is:

${\mathrm{\ϵ}}_T=\frac{{\mathrm{\ΔR}}_T}{R}\·\frac{1}{S_g}=\frac{{\mathrm{\γ}}_f\mathrm{\ΔT}}{S_g}---\left(6\right)$

Tinsel is different from the linear expansion coefficient of backing material, thus causes additional strain when temperature variation.The strain that tinsel causes because of temperature variation:

ε _g＝α _gΔT(7)

The strain that backing material causes because of temperature variation:

ε _s＝α _sΔT(8)

In formula: α _g---linear expansion coefficient wiry;

α _s---the linear expansion coefficient of backing material.

Work as α _g≠ α _stime, ε _gand ε _snot etc., thus cause strain error

Δε＝ε _g-ε _s＝(α _g-α _s)ΔT(9)

Therefore total additional strain that these two temperature factors cause is

${\mathrm{\ϵ}}_a={\mathrm{\ϵ}}_t+\mathrm{\Δ\ϵ}=\frac{{\mathrm{\γ}}_r\mathrm{\ΔT}}{S_g}+({\mathrm{\α}}_g-{\mathrm{\α}}_s)\mathrm{\ΔT}---\left(10\right)$

In addition, the sensitivity coefficient S of foil gauge _galso vary with temperature and change, also may cause the change of strain value.But generally S _gchange very little, the change of the strain value caused by this factor can be ignored.

Temperature effect is taked as under type compensates.Wherein adopt a dummy gauge, it is configured on two adjacent walls of an electric bridge together with working strain gauge, and two foil gauges are duplicate foil gauge, and makes them experience identical temperature.The change in resistance caused by the temperature coefficient of resistance and Differential thermal expansions like this by the output voltage of electric bridge without impact, and the change in resistance caused because of normal input load will make electric bridge out of trim, thus produces and export.

Paste Backfilling With Piping feed flow calculates, and when lotion moves in pipeline, the pass between pressure drop and flow is:

$\mathrm{\Δp}=\mathrm{\λ\ρ}\frac{l}{d}\frac{Q}{2}\frac{1}{A^2}Q---\left(11\right)$

Measure the design of pipeline, owing to surveying in the process of pipeline pressure at application foil gauge, the requirement of measuring pipeline is wanted high than normal pipeline, especially must ensure that pipeline has enough intensity and toughness when lotion flows through and measures pipeline, therefore, this section of pipeline needs to apply special material, makes it have thinner wall thickness when ensureing good elastic deformation and intensity.

This device has good versatility, and can be applied to the flow measurement of all coal mine paste filling Cemented filling, measuring accuracy is high, easy for installation, is easy to operation.Use strain gauge method to survey coal mine paste filling Cemented filling flow, more accurate and stable flow value can be obtained.

Summary of the invention

Accompanying drawing explanation

Fig. 1 diaphragm type foil gauge

Fig. 2 measuring channel test point position

Foil gauge position, Fig. 3 S1 cross section

Foil gauge position, Fig. 4 S2 cross section

Embodiment

Along with the mankind are to a large amount of exploitations in colliery, mostly become hollow state below earth's surface, paste body filling technique is thereupon raw.And for the mensuration of coal mine paste filling Cemented filling flow, its measurement result whether accurate, can be related to filling normally runs, and plays an important role in guarantee paste body filling normally operation.

Along with the development of modern science and technology, the requirement of enterprise to production system automatic controlling level improves constantly, and control procedure requires more safe and reliable, and function is more complete, need production process information Centralized Monitoring, real time access, automatic analysis, so that implement optimal operation scheme.

Owing to needing the pressure differential detecting conveyance conduit two cross sections, therefore two positions measuring pipeline are needed to paste foil gauge respectively, and paste in four orientation up and down of these two positions respectively, the data obtained are averaged, as the force value in this cross section.

When lotion is normally carried, by strain gauge adhesion at assigned address, sense data after registration is stable, then calculates the flow of lotion in lotion transport pipeline according to above-mentioned formula.

The choosing method of its test point S1, S2 in test process, namely measuring point S1 pressure source is got apart from 50m place, pipeline crossing, and measuring point S2 gets apart from 100m place, pipeline crossing.

Paste foil gauge respectively up and down in pipeline test point, the force value at this place get each point (P1, P2, P3, P4, P1 ', P2 ', P3 ', P4 ') mean pressure.

The low-pass digital filter algorithm carry out force value and program, with the impact of stress release treatment.

This device has good versatility, and can be applied to the flow measurement of all coal mine paste filling Cemented filling, measuring accuracy is high, easy for installation, is easy to operation.Use strain gauge method to survey coal mine paste filling Cemented filling flow, more accurate and stable flow value can be obtained.

Claims (3)

1. a lotion Cemented filling flow measurement device, it is characterized in that, the foil gauge that this device comprises lotion duct survey section and pastes at two assigned addresses of the lotion pipeline of needs measurement, each assigned address pastes four foil gauges, four foil gauges lay respectively at four orientation up and down of pipeline assigned address, and two assigned addresses lay respectively at apart from 50m place, pipeline crossing with apart from 100m place, pipeline crossing.

2. lotion Cemented filling flow measurement device as claimed in claim 1, it also comprises low-pass digital filter module.

3. lotion Cemented filling flow measurement device as claimed in claim 1, wherein said foil gauge is diaphragm type foil gauge.