CN104280096A - Self-floating water level tester - Google Patents

Abstract

A self-floating water level tester comprises a pendant (6), a floater (5), a pipe orifice plug (2), a thin measuring cord (3) graduated and a connector (4). The thin measuring cord (3) penetrates the pipe orifice plug (2) and is sequentially connected with the floater (5) and the pendant (6) though the connector (4); the floater can drive the pendant to float in water. When the self-floating water level teste is in use in construction of a project requiring water level measurement, a water level pipe (7) which is a pipe provided with holes in the sidewall is installed first, and the tester is directly put in the pipe for use. The self-floating water level tester is convenient to operate, rarely damaged, free of power, applicable to various work environments and low in manufacturing cost, has testing precision up to 1mm and meets engineering requirements.

Description

A kind of self-floating water level tester

Technical field

The present invention relates to a kind of self-floating water level tester, belong to water level monitoring technical field.

Background technology

Current civil engineering work, traffic engineering, the water level monitoring instrument adopted in hydraulic engineering is known mainly contains float-type limnimeter, pressure transducer formula limnimeter, ultrasonic type limnimeter etc.These water-level instrumentations connect sensor under water by wire, utilizes the signal of sensor passes, through electronic processors analytical calculation, changes into digital signal and export.

The water temperature of the sensor General Requirements working environment that these water level monitoring instruments use is between 0 ~ 60 DEG C, and owing to being immersed in water for a long time, make the as easy as rolling off a log fouling of these these sensors and oxidation corrosion, not only make water level detecting data misalignment, also have likely polluted source.Moreover, these electronic monitor systems all need laying wire electric energy transmitting source, complex operation, and cost is higher, and there is certain potential safety hazard.

In sum, these water-level instrumentation ubiquity somewhat expensives, fragile, high to operating environment requirements shortcoming.

Summary of the invention

The object of the invention is, in order to solve the problems referred to above that existing level measurement device exists, the invention provides a kind of self-floating water level tester.

Realizing technical scheme of the present invention is, a kind of self-floating of the present invention water level tester is made up of pendant, float, mouth of pipe plug, thin lining rope with a scale and connection fastener.Float one end connects pendant by cord with a scale, the float other end by connection fastener be arranged on thin lining rope with a scale on tape measure dish and be connected.

Described float is capsule moulding, and length direction two ends adopt dome-type, and middle overall employing cylinder type, its cross-sectional diameter is no more than 4cm.

Described thin lining rope minimum scale with a scale is mm, and under Gravitative Loads, strain is less than 1 × 10 ^-4, material selection elastic modulus is no more than the fine wire of 100MPa, also can adopt the tape measure meeting suitable standard.

Described pendant adopts can enter the discarded metal block that diameter is the pipeline of 5cm easily, with float with the use of time, the cylindrical section part that can ensure in the middle of float surfaces more than 1cm.

Described mouth of pipe plug is tapered, tapered slope is in vertical direction with α angle (tan α=0.5), and upper end cross-section diameter is 5cm, and lower end cross-section diameter is not less than 1cm, mouth of pipe plug is designed to the two halves structure of full symmetric, and axial location reserves the hole that lining rope just passes through.

Principle of work of the present invention is: utilize buoyancy of water, and when float is immersed in the water, float and pendant are subject to buoyancy and himself gravity when balancing each other, and lining rope is changed to a kind of state loosened by the state of original stressed anxiety, can measure the distance of water level to the mouth of pipe.

The present invention considers that general water is 0 DEG C time, density p ₀for 0.9998g/cm ³, when 20 DEG C, density p ₂₀for 0.9980g/cm ³when 40 DEG C, density p ₄₀for 0.9922g/cm ³if float cross-sectional area is A, unit is cm ²; Float and pendant gross mass are M, and unit is g; When 0 DEG C, pendant and float are immersed in the water the cumulative volume of part is v ₀, unit is cm ³; Then when 0 DEG C with 40 DEG C, when float load line remains on middle circle shell of column part, then load line difference is:

$\mathrm{\Δ}{L}_1=\frac{{\mathrm{\ρ}}_0{\mathrm{gv}}_0-{\mathrm{\ρ}}_{40}{\mathrm{gv}}_0}{{\mathrm{\ρ}}_{40}\mathrm{gA}}=\frac{{\mathrm{\ρ}}_0{v}_0-{\mathrm{\ρ}}_{40}{v}_0}{{\mathrm{\ρ}}_{40}A}$

Have: $v_0=\frac{\mathrm{Mg}}{{\mathrm{\ρ}}_{0}g}=\frac{M}{{\mathrm{\ρ}}_0}$

Substitute into above formula can obtain:

$\mathrm{\ΔL}=\frac{{\mathrm{\ρ}}_0\frac{M}{{\mathrm{\ρ}}_0}-{\mathrm{\ρ}}_{40}\frac{M}{{\mathrm{\ρ}}_0}}{{\mathrm{\ρ}}_{40}A}=\frac{M}{A}(\frac{1}{{\mathrm{\ρ}}_{40}}-\frac{1}{{\mathrm{\ρ}}_0})=\frac{M}{3.14\×2^2}(\frac{1}{0.9922}-\frac{1}{0.9998})=6.1\×{10}^{-4}\mathrm{Mcm}/g$

As M<163g, Δ L<0.01cm, so known when metal pendant and float gross mass are less than 163g, error is less than 1mm, when measurement environment is normal temperature, can 20 DEG C be as the criterion, fixing lining rope link position, simplified measurement link.

The invention has the beneficial effects as follows, apparatus of the present invention are easy to operate, not fragile, do not need power supply, be applicable to various working environment, and cost are low, and measuring accuracy can reach 1mm, can meet the requirement in engineering.

Accompanying drawing explanation

Fig. 1 is apparatus structure of the present invention and fundamental diagram;

Fig. 2 is the structural drawing of mouth of pipe plug in the present invention;

Fig. 3 is the upward view of Fig. 2 mouth of pipe plug;

Fig. 4 is the vertical view of Fig. 2 mouth of pipe plug.

In figure, 1 is tape measure dish; 2 is mouth of pipe plugs; 3 is thin lining ropes with a scale; 4 is connection fasteners; 5 is floats; 6 is pendants; 7 is water level pipes.

Embodiment

The specific embodiment of the present invention as shown in Figure 1.

A kind of self-floating water level tester in the present embodiment is made up of pendant 6, float 5, mouth of pipe plug 2, thin lining rope 3 with a scale and connection fastener 4.Float 5 one end connects pendant by cord 3 with a scale, the float other end by connection fastener be arranged on thin lining rope with a scale on tape measure dish and be connected.

The float 5 of the present embodiment, two ends are adopted to be hemispheric hollow plastic glue material, interlude is right cylinder, the overall moulding in capsule shape, not only can make float smooth putting into and take out in water level pipe, and avoid in the upper and lower process of float with water level pipe friction, damage corner angle and affect precision.

Below float 5, hang pendant 6, float both can have been made to enter after in water level pipe, smooth is descending, saves the running time, and when lining rope also can be made to be critical and when loosening, difference obviously, and makes float and plummet center move down, and makes float keep vertically floating in water.Pendant size can make lining rope glide smoothly with satisfied and keep float load line to be as the criterion at float center section, and the present embodiment selects diameter to be the steel ball of 10mm.

Measure the accuracy of water level to depend primarily on and measure the judgement of people for lining rope tension relaxation state boundary, assuming that during the stressed T of lining rope, tension is obvious, if the cross-sectional area of float is A, then measuring result error can obtain float cross-sectional area A by formula larger, then measuring error Δ T is less, but consider diameter be 5cm water level pipe inside corrosion or collsion damage may make section deformation, therefore need between float and tube wall to keep certain space, getting float diameter is 4cm.

The present embodiment is for reducing error, accurate reading, ad hoc meter mouth of pipe plug.The taper mouth of pipe beyond the Great Wall end cross-section diameter is 5cm, tapered slope is in vertical direction with α angle (tan α=0.5), mouth of pipe plug is designed to the two halves structure of full symmetric, middle leave lining rope just by hole, during guarantee reading, lining rope is vertical up and down, utilize mouth of pipe plug center and the mouth of pipe high together, can accurate reading.For avoiding lining rope and water level pipe mouth of pipe frictionally damage lining rope, except location of reading, all the other each contact positions all adopt anti-cutting technical finesse.

In the present embodiment because the load line of float 5 and the weight of pendant 6 and float weight and to survey the proportion of water level water relevant, therefore different water temperatures and water quality, have different load lines.Before measuring, pendant 6 can be connected float submerged, treat that float 5 is vertically static, determine load line position.

Before measuring, pendant 6 is connected float 5 submerged; After float 5 is vertically static, determine load line position; After lining rope or tape measure 1 zero graduation and float 5 load line vertical alignment, find out the scale corresponding to the link position of float top; By lining rope 1 through float connecting portion, with the scale that aligns for benchmark, got on lower part turnover by lining rope link position, stretching rear connection fastener 4 is stuck; After pendant 6 and float 5 are put into water level pipe 7, lining rope is placed in the middle of mouth of pipe plug 2, stopper 2 level is seated the water level pipe mouth of pipe, appoint float 5 to fall; When float 5 be immersed in the water reach equilibrium state time, lining rope 1 is changed to a kind of state loosened by the state of original stressed anxiety, reads the tape measure now corresponding to stopper 2 center or lining rope 1 scale, is water level apart from the distance of the mouth of pipe.

Adopt this self-floating water-level gauge to monitor each measuring point underground water table in pit retaining monitoring, survey water level and Data Comparison that common water-level gauge is surveyed as table 1:

Table 1 waterlevel data contrast table

Note: water level test data unit is rice, "-" represents that water level is relative to the following absolute altitude of the water level pipe mouth of pipe.

Perform the standard of water level monitoring by " architecture Foundation Pit Engineering Specifications of Monitoring Technology " (GB50497-2009), require that the precision of water level monitoring is not less than 10mm.As can be seen from Table 1, this self-floating water-level gauge differs very little with data that common water-level gauge is surveyed, and the two data of surveying can both meet code requirement.

Claims (6)

1. a self-floating water level tester, is characterized in that, described tester comprises pendant, float, mouth of pipe plug, thin lining rope with a scale and connection fastener; Thin lining rope with a scale is linked in sequence by connection fastener and float and pendant through mouth of pipe plug, and float can float in water with pendant.

2. a kind of self-floating water level tester according to claim 1, is characterized in that, described float two ends adopt hemisphere moulding, and the moulding of middle employing right cylinder, overall in capsule moulding, its maximum cross section diameter is no more than 4cm.

3. a kind of self-floating water level tester according to claim 1, is characterized in that, described thin lining rope minimum scale with a scale is mm, and under Gravitative Loads, strain is less than 1 × 10 ^-4, material selection elastic modulus is no more than the fine wire of 100MPa, also can adopt the tape measure meeting suitable standard.

4. a kind of self-floating water level tester according to claim 1, it is characterized in that, described pendant can adopt and can enter the discarded metal block that diameter is the pipeline of 5cm easily, with described float with the use of time, the cylindrical section part that can ensure in the middle of float surfaces more than 1cm.

5. a kind of self-floating water level tester according to claim 1, it is characterized in that, described mouth of pipe plug is tapered, tapered slope in vertical direction with α angle, tan α=0.5; Upper end cross-section diameter is 5cm, and lower end cross-section diameter is not less than 1cm, and mouth of pipe plug is designed to the two halves structure of full symmetric, and axial location reserves the hole that described thin lining rope with a scale just passes through.

6. self-floating water level tester according to claim 2, is characterized in that, described float material can adopt solid wooden or foam matter, or adopts hollow plastic colloid.