CN104849179A - Automatic leveling device for liquid surface tension coefficient measurement - Google Patents

Abstract

The invention relates to a liquid surface tension verification experiment tool, in particular to an automatic leveling device for liquid surface tension coefficient measurement and aims to solve the technical problems that the levelness of a metal part used in a liquid surface tension verification experiment at present is not easy to adjust. The automatic leveling device for liquid surface tension coefficient measurement comprises a leveling circular ring, an automatic level gauge and a bottom water tank, wherein the circumference of the upper end opening of the leveling circular ring extends outwards to form a boss; the automatic level gauge is suspended in the bottom water tank which is internally filled with a liquid and is suspended; the leveling circular ring penetrates through a first through hole from top to bottom and is limited at the lower end opening of the first through hole through limiting matching of the boss and a limiting platform. The liquid in the bottom water tank is adopted as a carrier for leveling adjustment, and very precise leveling can be theoretically achieved by using the automatic level gauge suspended in the liquid; in an experiment, the leveling circular ring can contact the surface of the liquid at a precise leveling posture, and the experiment precision can be ensured.

Description

Liquid surface tension coefficient measurement self-level(l)ing device

Technical field

The present invention relates to surface tension of liquid confirmatory experiment utensil, be specially a kind of liquid surface tension coefficient measurement self-level(l)ing device.

Background technology

In Experiment of College Physics, surface tension of liquid be measured as classical replication experiment, dark liking by teacher and classmates.In order to allow the method for Students ' Learning surface tension, understand surface tension of liquid knowwhy better, most of high science and engineering universities and colleges have all offered this laboratory.Therefore, to measuring the method for liquid surface tension coefficient and experimental apparatus also just has varied, wherein utilizing and evening up method and Pulling escape is comparatively common.In metal-liquid surface tension coefficient measuring experiment, no matter adopt sheet metal, tinsel or becket, all there is a thorny requirement of experiment, exactly allow metal parts (as becket) and testing liquid surface flat contact as much as possible.Due to the limitation of prior art and device, the Level tune of metal parts is all a difficult problem all the time, causes metal parts perfectly with horizontal attitude contact liq surface, and then can not directly affect the error of experimental measurements.Therefore in this experiment, the level of fine adjustment metal parts becomes the key of whole experiment.

Summary of the invention

The present invention is the technical matters that the level solving metal parts in current surface tension of liquid confirmatory experiment not easily regulates, and provides a kind of liquid surface tension coefficient measurement self-level(l)ing device.

The present invention realizes by the following technical solutions: a kind of liquid surface tension coefficient measurement self-level(l)ing device, comprises horizontal circle suspension ring, automatic level and bottom tank; The upper port border of described horizontal circle suspension ring horizontally outward extends to form boss; Described automatic level is ring channel structures, and this ring groove center up/down perforation forms the first through hole and the lower port of the first through hole extends straight down, and extension lower port level extends internally to be formed and carries out spacing limiting stand to the boss of horizontal circle suspension ring; Described bottom tank also groove structure and be wherein formed through the second through hole down in the heart ringwise; Described automatic level is suspended in inside and fills liquid and among the bottom tank be draped, the first through hole through the second through hole and the lower end of the first through hole lower than the second through hole lower end; Described horizontal circle suspension ring coordinate from top to bottom through the first through hole and by boss and limiting stand the lower port being limited in the first through hole.

The application, mainly for becket Pulling escape, designs self-level(l)ing device, and mainly solve in surface tension of liquid test, becket lower limb anchor ring and testing liquid liquid level are difficult to the technical matters of parallel contact.

This device comprises three parts: horizontal circle suspension ring, automatic level and bottom tank.Each several part is rotational symmetry parts, and sectional view as shown in Figure 1.

The principle of work of device described in the application as shown in Figure 2.Tank top, bottom is connected by the hook of stay cord with tension measurement equipment, and by regulating stay cord to make tank approximate horizontal, injects appropriate distilled water in tank.Horizontal circle suspension ring are coordinated by boss and limiting stand, be limited in automatic level bottom, by the second through hole of bottom tank, the automatic level fixing horizontal circle suspension ring is placed on the tank distilled water of bottom, it is made to swim on the distilled water water surface, and do not contact with bottom tank inside and outside wall, wait for that in tank, distilled water stops fluctuation.Because automatic level is rotational symmetry parts, it is under buoyancy, and bottom tank distilled water surface level should be parallel with automatic level lower limb and horizontal circle suspension ring lower limb anchor ring.As can be seen here, testing liquid is put in another one surface plate, is placed in below horizontal circle suspension ring, so the liquid level of testing liquid is just obviously parallel with the lower limb circular planes of horizontal circle suspension ring.

The present invention adopts the liquid in the tank of bottom as the carrier of Level tune, the automatic level be suspended in wherein point-devicely can realize level in theory, the horizontal circle suspension ring being positioned at automatic level first through hole lower port can realize real level, like this when testing, horizontal circle suspension ring just so that horizontal attitude contact liq is surperficial accurately, can ensure that the accuracy of experiment.Whole apparatus structure is very simple, and operation debugging also very simple and convenient, substantially increases conventional efficient.

Accompanying drawing explanation

Cross-sectional view under each isolation of components state of Fig. 1 device of the present invention.

The each component combination of Fig. 2 device of the present invention cross-sectional view together.

The cross-sectional view of Fig. 3 horizontal circle suspension ring.

The cross-sectional view of Fig. 4 automatic level.

The cross-sectional view of tank bottom Fig. 5.

The structural representation of Fig. 6 horizontal circle suspension ring.

The structural representation of Fig. 7 automatic level.

The structural representation of tank bottom Fig. 8.

Fig. 9 the present invention is applied to force analysis during actual liquid stalagmometry.

1-horizontal circle suspension ring, 2-automatic level, tank bottom 3-, 4-boss, 5-first through hole, 6-limiting stand, 7-second through hole, 8-stay cord, 9-surface plate.

Embodiment

A kind of liquid surface tension coefficient measurement self-level(l)ing device, comprises horizontal circle suspension ring 1, automatic level 2 and bottom tank 3; The upper port border of described horizontal circle suspension ring 1 horizontally outward extends to form boss 4; Described automatic level 2 is ring channel structures, this ring groove center up/down perforation forms the first through hole 5 and the lower port of the first through hole 5 extends straight down, and extension lower port level extends internally to be formed and carries out spacing limiting stand 6 to the boss 4 of horizontal circle suspension ring 1; Described bottom tank 3 also groove structure and be wherein formed through down the second through hole 7 in the heart ringwise; Described automatic level 2 is suspended in inside and fills liquid and among the bottom tank 3 be draped, the first through hole 5 through the second through hole 7 and the lower end of the first through hole 5 lower than the second through hole 7 lower end; Described horizontal circle suspension ring 1 coordinate from top to bottom through the first through hole 5 and by boss 4 and limiting stand 6 lower port being limited in the first through hole 5.

The ring groove inner ring upper end edge of automatic level 2 extends to ring groove central horizontal, and extension connects a pipe core straight down again and forms the first through hole 5, with ensure automatic level 2 can be suspended in fill liquid bottom tank 3 among.

Automatic level 2 and bottom tank groove structure all ringwise,

The force analysis of the present invention when embody rule as shown in Figure 9,

F＝G+f (1)

G＝G1+G2+G3+G4 (2)

F is measured value, and G is total force, and f is surface tension, and G1 is the gravity of bottom tank, and G2 is the gravity of distilled water in the tank of bottom, and G3 is the gravity of automatic level, and G4 is the gravity of horizontal circle suspension ring (aluminium ring).

In the tank of bottom, distilled water makes the buoyancy of its floating needs be

F _floating=G3+G4+f

(3)

F _floatingfor the buoyancy that distilled water in the tank of bottom produces, 20 DEG C time, the ρ of 1 normal atmosphere pressure _water=1 × 10 ³kg/m ³, h is the height that automatic level water jacket does not have upstream face.

$\begin{array}{c}G3={\mathrm{\ρ}}_{0}g\frac{\mathrm{\π}}{4}[({D1}^2-{D11}^2)\×h1+({D11}^2-{D21}^2)\×h0\\ +({D21}^2-{D2}^2)\×h2+({D2}^2-{D3}^2)\×h0\\ +({D3}^2-{D31}^2)\×h3+({D31}^2-{D4}^2)\×h0]\end{array}---\left(4\right)$

20 DEG C time, the density p of the tygon (PE) of 1 normal atmosphere pressure ₀=(0.91 ~ 0.96) × 10 ³kg/m ³, gravity acceleration g=9.8m/s ².

20 DEG C time, the ρ of 1 normal atmosphere pressure _aluminium=2.7 × 10 ³kg/m ³

f＝(D4+D41)απ (6)

20 DEG C time, the surface tension coefficient α=0.07275N/m of 1 normal atmosphere pressure distilled water.

Table 1 calculating parameter and result

By upper Biao Ke get calculated value when h gets 0.030m is greater than the value of (G3+G4+f), and as can be seen here, automatic level can swim on the water surface of bottom tank.

Claims (2)

1. a liquid surface tension coefficient measurement self-level(l)ing device, is characterized in that, comprises horizontal circle suspension ring (1), automatic level (2) and bottom tank (3); The upper port border of described horizontal circle suspension ring (1) horizontally outward extends to form boss (4); Described automatic level (2) is ring channel structures, this ring groove center up/down perforation forms the first through hole (5) and the lower port of the first through hole (5) extends straight down, and extension lower port level extends internally to be formed and carries out spacing limiting stand (6) to the boss (4) of horizontal circle suspension ring (1); Described bottom tank (3) also groove structure and be wherein formed through down the second through hole (7) in the heart ringwise; Described automatic level (2) is suspended in inside and fills liquid and among the bottom tank (3) be draped, the first through hole (5) through the second through hole (7) and the lower end of the first through hole (5) lower than the second through hole (7) lower end; Described horizontal circle suspension ring (1) coordinate from top to bottom through the first through hole (5) and by boss (4) and limiting stand (6) lower port being limited in the first through hole (5).

2. liquid surface tension coefficient measurement self-level(l)ing device as claimed in claim 1, it is characterized in that, the ring groove inner ring upper end edge of automatic level (2) extends to ring groove central horizontal, extension connects a pipe core straight down again and forms the first through hole (5), with ensure automatic level (2) can be suspended in fill liquid bottom tank (3) among.