CN85203504U

CN85203504U - Lever-type density readout for solid and liquid

Info

Publication number: CN85203504U
Application number: CN 85203504
Authority: CN
Inventors: 唐发仁
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-08-20
Filing date: 1985-08-20
Publication date: 1986-04-30

Abstract

The utility model relates to a lever-type density readout for solid and liquid, comprising a lever, a standing rack, an edge and an aluminium weight dropper, wherein, a fluid density rule and a solid density rule are engraved on the lever. The lever-type density readout for solid and liquid has the advantages of wide density measuring scope, easy measuring method, practicality and accurate number reading, which can be used for measuring solid and fluid density of geology, petroleum, chemical industry, banks, hospitals and research units.

Description

Lever-type density readout for solid and liquid

The utility model is relevant with the measurement of quality, can measure the density of solid, can measure density of liquid again.

Known lever densitometer purposes is single, perhaps can only measure the density of solid, perhaps can only measure density of liquid, and measurement range is narrow.

The purpose of this utility model is: correct the existing deficiency of known densitometer, the mensuration of density expands to the dual-purpose densitometer that can measure the solid, liquid volume density by single purposes, and has increased the numerical range of measuring.

Utility model is achieved in that according to lever principle and Archimedes' principle, on lever, be carved with two kinds of density graduation chis of solid and liquid, replace indication weight indication density value with vernier, lever is placed on the elevating lever, elevating lever inserts stand, for preventing the lever overturning, the lever carriage is housed in the stand upper end.At first regulate base before the measurement and make its maintenance level, adjustment (adjusting) lever balance then, vernier is placed on lever right-hand member A point, testee hangs over the lever left end and moves to till the lever balance, testee is immersed in the liquid, moving cursor is to the lever balance position, and the scale of vernier indication is the density of testee.If measure density of liquid, only need add an aluminum weight and get final product, measuring method is the same.

The utility model has following advantage:

1. of many uses, can make the instruments used for education that school's Physical Experiment is used, also can supply geology, chemical industry, oil, bank, hospital and R﹠D institution to measure solid and fluid density.

2. measuring method is easy, rapidly; Accuracy of reading.

The concrete structure of utility model is provided by following examples and accompanying drawing thereof:

Fig. 1 is the structural representation of utility model.

Describe in detail according to detail and the working condition that the utility model proposes below in conjunction with Fig. 1.

Densitometer comprises lever (1), stand (11), holding liquid cup (16) and aluminum weight (20).There is an edge of a knife (2) lower end, middle part of lever (1), density of solid rule (3) and fluid density rule (4) are carved with in the right of lever (1), vernier (5) is equivalent to indicate weight to come indicating graduation, leveling spiral (6) is in order to adjusting the balance of lever (1), and determines whether balance by the horizontal pointer (7) of lever (1) left end and the scale (8) that is installed in the stand (11).Stand (11) is installed on the base (15), and elevating lever (9) is housed in the stand (11), and lever (1) is placed on the elevating lever (9), and the fixing of elevating lever (9) realized by fixing spiral (10).At the middle part drilling and tapping of stand (11), screw (12) is screwed in the hole, conelet hammer (13) is hung on the screw (12), and is straight line with the bocca (14) of base (15), judge with this whether instrument is in horizontality.In order to make base (15) maintenance level, on base (15), be equipped with 2 and adjust screw (19), for preventing lever (1) overturning, lever carriage (18) is housed on the top of stand (11).When measuring density of solid, earlier vernier (5) is moved to the A point, tested solid (17) is hung over the left end of lever (1), move to make lever (1) balance till, tested solid is constant from the distance of the edge of a knife, regulates elevating lever (9), tested solid (17) is immersed in the liquid, moving cursor (5) makes lever (1) balance again again, and after lever (1) balance, the scale of the density of solid rule (3) of vernier (5) indication is the density of tested solid (17).

Fig. 2 is the synoptic diagram of aluminum weight (20).

When measuring fluid density, earlier vernier (5) is moved to the A point, aluminum weight (20) is hung over the left end of lever (1), move to the position that makes lever (1) balance, aluminum weight (20) is immersed in the fluid to be measured, moving cursor (5) is to lever (1) position of balance again, and the scale on the fluid density rule (4) of vernier (5) indication is the density of fluid to be measured.The weight of aluminum weight is 50 grams.

The densitometric scale principle of the dual-purpose lever direct-reading of solid, liquid body is illustrated in conjunction with Fig. 3 and Fig. 4.

As shown in Figure 3, establishing indication weight weight is P, and tested solid weight is G, will indicate weight and tested solid to hang over the lever two ends, and brachium is respectively OA and OC when establishing lever balance, gets according to lever equilibrium condition:

G·OC＝P·OA……（1）

Then, the OC brachium is constant; Tested solid G is put into the liquid of glass cylinder, regulate the position of indication weight P, if when weight moves to B point, the lever balance second time, as shown in Figure 4.At this moment:

(G-F _Floating) OC=POB

I.e. (G-F _Floating) OC=P(OA-AB) ... (2)

(1)+(2) formula gets

(G)/(G-F _Floating)=(OA)/(OA-AB)

Transposition is put in order:

GAB=F _FloatingOA ... (3)

∵ G=mg F _Floating=ρ gV _RowV=V _RowSubstitution (3) formula gets mgAB=ρ _LiquidGVOA

(m)/(V) ρ=(the OA ρ of ∵ ρ=(m)/(V)=(OA ρ)/(AB) _Liquid)/(AB)

…（4）

Annotate: F in the formula _Floating=buoyancy of liquid

The volume V of V=object _Row=object displacement of volume

ρ _Liquid=density of liquid

The density of ρ=tested solid

To get after the distortion of (4) formula:

AB=(OA ρ _Liquid)/(AB) ... (5)

Example: from (5) formula as can be known, if OA, ρ _LiquidValue is certain, and AB is with the ρ relation of being inversely proportional to, and ρ changes just an AB value to change, if establishing OA is 250 millimeters, and ρ _LiquidBe 1 * 10 ³Kilogram/rice ³, when the density of solid value is

ρ=20 * 10 ³Kilogram/rice ³The time, substitution (5) formula gets:

AB=(250 millimeters * 1 * 103 kilogram/meter 3)/(20 * 103 kilogram/meter 3)=12.5 millimeters

More than be the density of solid scale method, the fluid density scale method is the same, just tested density of solid ρ in (5) formula is changed into the density p of measuring weight (aluminum weight) _Hammer, ρ in the formula _LiquidBe fluid to be measured density.

Example: establishing OA is 250 millimeters, ρ _Hammer=2.7 * 10 ³Kilogram/rice ³Work as ρ _LiquidBe 1 * 10 ³Kilogram/rice ³The time, substitution (5) formula gets:

AB=(250 millimeters * 1 * 10 ³Kilogram/rice ³)/(20 * 10 ³Kilogram/rice ³)

=92.6 millimeters

Claims

1, the dual-purpose lever direct-reading of solid, liquid body densitometer, form by lever, rule, the edge of a knife, column, vernier, holding liquid cup, it is characterized in that being carved with on the lever [1] density of solid rule [3] and fluid density rule [4], elevating lever [9] and fixing spiral [10] are equipped with in stand [11], lever carriage [18] is equipped with in stand [11] upper end, is equipped with on the base [15] to adjust screw [19].

2, densitometer according to claim 1 is characterized in that the right-hand member of lever (1) is equipped with leveling spiral (6), and the left end of lever (1) is equipped with horizontal pointer (7), and scale (8) is housed in the stand (11).

3,, it is characterized in that when measuring density of liquid need with aluminum weight (20), the weight of aluminum weight (20) is 50 grams according to claim 1 and 2 described densitometers.