CN2243077Y

CN2243077Y - Electronic densimeter

Info

Publication number: CN2243077Y
Application number: CN 95229947
Authority: CN
Inventors: 叶名胜
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-23
Filing date: 1995-12-23
Publication date: 1996-12-18
Anticipated expiration: 2005-12-23

Abstract

The utility model relates to an electronic densimeter, which is characterized in that the utility model is provided with a tension sensor. A buoyancy probe is suspended at a tension signal detection end, the voltage signal can be output and be sent to a microprocessor through differential amplifying and analog-digital conversion. The buoyancy probe is a hollow metallic vessel and is provided with an upper case and a bottom end cover, the bottom end cover is dual-layer and comprises an inside layer sealing cover with a sealing washer and an external cover with a through hole. The utility model can be generally used for automatic measuring fluid density and solid density.

Description

A kind of electron density scale

The utility model relates to density measuring equipment.More particularly, be a kind of both energy measurements fluid density, the measurement mechanism of energy measurement solid matter density again.

In the prior art, fluid density is to claim to measure with proportion mostly, and the density of solid matter does not also have the directly instrument of measurement, can only continue to use and weigh, surveys volume, manually calculates again.The method that these are traditional, its complicated operation, personal error is big, and measuring accuracy is low.At present, also do not have and can measure fluid density, again can be in order to measure the measurement mechanism of solid matter density.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, provides a kind of quick, high precision, to liquid, the general scale formula electronic densitometer of solid matter density measure.

The purpose of this utility model is achieved through the following technical solutions.

The utility model is provided with pulling force sensor, hang the buoyancy probe in its test side, differential amplifier circuit that the output of its voltage signal constitutes via amplifier and analog to digital conversion circuit are to microprocessor, described buoyancy probe is the canister of hollow, constitute by upper cover and bottom head covers, bottom head covers is double-deck, comprises internal layer gland bonnet that has packing washer and the enclosing cover that has through hole.

According to Archimedes' principle: immerse the weight that the suffered buoyancy of material in the liquid equals liquid that material arranges.

F is floating=ρ liquid * V row (1) so, then have when solid matter is dipped in the liquid fully:

F is floating=and ρ liquid * V solid (2) therefore draws: and F is floating/and N is solid=ρ liquid/ρ solid (3)

Wherein, N is a gravity, and ρ is a density.

The utility model is based on above-mentioned principle, weighs for twice that solid matter to be measured (or medium solid) is dipped in before and after the media fluid (or testing liquid) by pulling force sensor, finishes the computation process of formula (3) by microprocessor, reaches the purpose of density measure.

Compared with the prior art, the utility model is simple to operate, personal error reduces greatly, carries out data processing with microprocessor, and measuring speed and measuring accuracy are all improved a lot.The utility model can be in order to record the density of fluid to be measured when making medium with the solid matter of known density; Otherwise, when the liquid with known density is medium, just can record the density of tested solid matter, the one thing is general, and functions of use is fully used.

Fig. 1 is the utility model schematic appearance.

Fig. 2 is the utility model buoyancy probe cross-sectional schematic.

Fig. 3 is the utility model circuit theory diagrams.

By the following examples, knot platform accompanying drawing is further described the utility model.

Embodiment:

Referring to Fig. 1, adopt portable structure, at the top of scale body 2 handle 1 is installed, the face of scale body 2 is furnished with display window 3 and action button 4, and pulling force sensor 5 is fixed on the bottom of scale body 2, and its pulling force input end hangs buoyancy probe 7.

Referring to Fig. 2, buoyancy probe 7 is the canister of hollow, is made of upper cover 8 and bottom head covers, and bottom head covers is double-deck, comprises internal layer gland bonnet 10 that has packing washer 9 and the enclosing cover 11 that has through hole 6.

Referring to Fig. 3, pulling force sensor adopts KSY-0.5, and at the differential amplifier circuit that its signal output part setting is made of amplifier IC1, IC2 and IC3, the amplifying signal of output carries out analog to digital conversion by 5G14433 IC4.Microprocessor is made of little process chip 8031 IC5, storer 2732 IC6, latch 74LS373 IC7, expansion mouthful 8255 IC8 and four LED demonstrations and four input function button K1, K2, K3 and K4.Four bit function buttons wherein are separately positioned on PB0, PB1, PB2 and the PB3 port of expansion mouthful IC8, respectively do for oneself " school zero ", " measurement ", " resetting " and " playback " button.

During measurement, by pulling force sensor the gravitational cue on the buoyancy probe is converted to voltage signal, after differential amplification, gives A/D IC4 chip, the digital signal of output is delivered to microprocessor.By microprocessor solid matter is immersed in the liquid front and back and weighs for twice, and the density value of input known media, the following formula of substitution:

ρ liquid/ρ is solid=(N1-N2)/and N1 (4)

Wherein, ρ liquid is fluid density, and ρ is density of solid admittedly, and N1 is a solid weight, and N2 is the weight of solid immersion in liquid, and N1-N2 is the suffered buoyancy of solid.

The measurement of fluid density: the buoyancy probe with known density is the medium solid.

Internal layer gland bonnet 10, the enclosing cover 11 of buoyancy probe 7 is fixing with top cover cap 8, in buoyancy probe 7, form airtight cavity, pop one's head in for the airtight buoyancy that volume and weight N1 determines, its average density ρ is certain value admittedly, thereby, the buoyancy of known density probe 7 is immersed in the liquid, claim to such an extent that it is immersed in weight N2 in the liquid, bring the density p liquid that above-mentioned formula (4) can draw fluid to be measured into.All the measurements and calculations process is finished automatically by microprocessor.

The measurement of density of solid: the liquid with known density is medium.

Unload the internal layer gland bonnet 10 on the buoyancy probe 7, constitute tested solids container (being the scale pan) by enclosing cover 11 and upper cover 8, tested solid places in it.Liquid with known density ρ liquid is medium, taking by weighing the buoyancy that is placed with tested solid pops one's head at the weight N1 and the N2 that are dipped in the media fluid front and back, calculate the average density of tested solid matter and buoyancy probe according to formula (4), draw tested density of solid value then.

For the measurement of density of solid, the setting of buoyancy probe can guarantee the density of the average density of tested solid and buoyancy probe greater than media fluid, to satisfy the condition of apparatus measures " submergence fully ".

Claims

1, a kind of electron density scale, it is characterized in that being provided with pulling force sensor KSY-0.5 (5), hang buoyancy probe (7) in its test side, differential amplifier circuit that the output of its voltage signal constitutes via amplifier IC1, IC2 and IC3 and the analog to digital conversion that is made of chip IC 4 are to microprocessor, described buoyancy probe (7) is the canister of hollow, constitute by upper cover (8) and bottom head covers, bottom head covers is double-deck, comprises internal layer gland bonnet (10) that has packing washer (9) and the enclosing cover (11) that has through hole (6).