CN100389316C - Digital system for liquid specific density measurement - Google Patents
Digital system for liquid specific density measurement Download PDFInfo
- Publication number
- CN100389316C CN100389316C CNB2005100261214A CN200510026121A CN100389316C CN 100389316 C CN100389316 C CN 100389316C CN B2005100261214 A CNB2005100261214 A CN B2005100261214A CN 200510026121 A CN200510026121 A CN 200510026121A CN 100389316 C CN100389316 C CN 100389316C
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- Prior art keywords
- lever
- density measurement
- liquid specific
- specific density
- auxiliary lever
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Abstract
The present invention discloses a digital liquid specific density measurement system which is characterized in that the digital liquid specific density measurement system is formed by the connection of a specific weight measurement device, an A/D converter, an SCM, a digital display circuit or/and a computer, wherein the specific weight measurement device comprises a floater, a main lever, an auxiliary lever, an amplifier, a permanent magnet and a feedback coil. The floater is arranged at one end of the main lever; a fulcrum of the main lever is arranged in the middle of the lever. The main lever and the auxiliary lever are connected by a linking block; a displacement detection sheet is arranged on the auxiliary lever; a displacement detector is arranged below the displacement detection sheet. One end of the auxiliary lever is provided with a fulcrum, and the other end is provided with a zero regulator. The feedback coil is arranged on the auxiliary lever and is arranged in the middle of the permanent magnet. The displacement detector is connected with the feedback coil through a detection amplifying circuit. The present invention has the advantage of convenient and precise use and the functions of realizing the automatic measurement of liquid specific gravity and carrying out computer data acquisition and digital display, etc. and enhances work efficiency.
Description
Technical field
The present invention relates to a kind of measuring system, more particularly, it relates to a kind of digital system for liquid specific density measurement.
Background technology
At present, measure liquid specific gravity and be mostly first sampling, and then with lever areometer measuring samples proportion.This method manual operation, the artificial observation reading, reading error varies with each individual, and the correctness of reading is poor, can not realize data automatic collecting and demonstration, and can not automatic real-time measurement.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of have easy to use, fast, the digital system for liquid specific density measurement accurately measured.
Technical scheme of the present invention is, a kind of digital system for liquid specific density measurement is characterized in, it is formed by connecting by lever liquid specific density measurement device, A/D converter, single-chip microcomputer, digital display circuit or with computing machine; It comprises float, main lever, auxiliary lever, amplifying circuit, permanent magnet, the tickler that is in the liquid described lever liquid specific density measurement device, and float places an end of main lever, in the middle of main lever point is located at; Main lever is connected by linked block with auxiliary lever, auxiliary lever is provided with the displacement detecting sheet, displacement detector places below the displacement detecting sheet, the auxiliary lever fulcrum is located at the one end, the other end is provided with bias spring zeroing device, be equipped with two ticklers on the auxiliary lever, two ticklers place respectively permanent magnet S, N extremely in the middle of and N, S extremely in the middle of, displacement detector is connected with tickler by detecting amplifying circuit.
The invention has the beneficial effects as follows: the present invention have easy to use, accurate, can realize that liquid specific gravity measures automatically, can carry out computer data acquiring and automatic digital Presentation Function efficiently, improved work efficiency.
Description of drawings
Fig. 1 is a structure principle chart of the present invention,
Fig. 2 is a lever liquid specific density measurement apparatus structure synoptic diagram;
Fig. 3 detects amplification circuit diagram.
Embodiment
The invention will be further described below in conjunction with accompanying drawing:
By Fig. 1, shown in Figure 2, a kind of digital system for liquid specific density measurement is characterized in that, it is formed by connecting by lever liquid specific density measurement device, A/D converter, single-chip microcomputer and digital display circuit or computing machine; It comprises float 2, main lever 3, auxiliary lever 6, amplifying circuit 7, permanent magnet 10, the tickler 11 that is in the liquid 1 described lever liquid specific density measurement device, float 2 is a metal material, place an end of main lever 3, the fulcrum 01 of main lever 3 is located in the middle of the lever; Main lever 3 is connected by linked block 12 with auxiliary lever 6, auxiliary lever 6 is provided with displacement detecting sheet 5, displacement detector 4 places below the displacement detecting sheet 5, auxiliary lever 6 fulcrums 02 are at the one end, the other end is provided with bias spring zeroing device 8, be equipped with on the auxiliary lever 6 S, N that 11, two ticklers 11 of two ticklers place permanent magnet 10 respectively extremely in the middle of and N, S extremely in the middle of, displacement detector 4 is connected with two coils 11 by detecting amplifying circuit 7 and resistance 13.Being immersed in float 2 in the liquid 1 is subjected to liquid buoyancy and uses and move, move by the displacement detecting sheet 5 that promotes on the main lever 3 drive auxiliary levers 6, the displacement of moving is directly proportional with the buoyancy that float is subjected to, and displacement detector 4 records the current signal that is directly proportional with 5 displacements of displacement detecting sheet.Because buoyancy equals liquid specific gravity and float arranges the long-pending of fluid to be measured volume, is directly proportional with the liquid specific gravity size so displacement detector 4 records current signal, this current signal can record fluid to be measured proportion.
By shown in Figure 2, be equipped with magnetic shunt path set screw 9 on extremely at described permanent magnet 10 1 side S.
By shown in Figure 3, described detection amplifying circuit 7 is by Rw, Rx, R
1Bridge circuit of forming and amplifier A form, and Rx is the impedance of displacement detector 4 medium-high frequency oscillators, R
0For being connected to the pull-up resistor of amplifier A output terminal.When the displacement between displacement detecting sheet 5 and the displacement detector 4 changes, R
XValue will change.Before the measurement, regulate the resistance R in the bridge circuit
W, make by load R
0Electric current be zero.
The principle of the invention is done an explanation in conjunction with Fig. 1, Fig. 2, at first adjusts zero-bit before use.Immerse float in the fluid to be measured fully then, because fluid to be measured proportion difference, the buoyancy difference that float is subjected to, under buoyancy, lever system will produce one and the corresponding displacement signal of buoyancy, detect amplifying circuit this displacement signal is converted into the normalized current signal, this normalized current signal, produce an electro-magnetic feedback moment loading by the electro-magnetic feedback system on the one hand and make it arrive new balance in lever system, this current signal is sent into single-chip microcomputer by A/D converter on the other hand, and directly demonstrate the proportion of fluid to be measured by display, or carry out remote transmission, and carry out telecommunication with computing machine, rate of specific gravity is collected in the computing machine automatically.The present invention at first regulates zero point before measurement, realize that by regulating bias spring zeroing device 8 zeroing device 8 also can be realized span shift.During use, when float is not subjected to buoyancy, the output current that detects amplifying circuit is zero, when fluid to be measured adds in the container, immerse float 2 in the fluid to be measured fully, the buoyancy of float 2 is on main lever 3, main lever 3 passes to auxiliary lever 6 for propping up this power of naming a person for a particular job by linked block 12 with O1, auxiliary lever 6 is that fulcrum is offset with O2, the displacement detecting sheet 5 that drives simultaneously on the auxiliary lever 6 moves, high frequency displacement detector 4 detects the displacement of displacement detection lug 5 and converts normalized current signal proportional with it to, the input of this normalized current signal is placed on tickler 11 in the permanent magnet 10, tickler 11 produces a feedback force and acts on the auxiliary lever 6, makes lever system reach new equilibrium state on the one hand, and this current signal and float 2 suffered buoyancy are directly proportional, float all is immersed in the liquid, volume is known, and buoyancy equals the long-pending of liquid specific gravity and float volume, therefore can measure the proportion of liquid by this measurement mechanism.
Claims (3)
1. a digital system for liquid specific density measurement is characterized in that, it is formed by connecting by lever liquid specific density measurement device, A/D converter, single-chip microcomputer and digital display circuit or computing machine; It comprises float (2), main lever (3), auxiliary lever (6), amplifying circuit (7), permanent magnet (10), the tickler (11) that is in the liquid (1) described lever liquid specific density measurement device, float (2) places an end of main lever (3), is provided with fulcrum 01 in the middle of the main lever (3); Main lever (3) is connected by linked block (12) with auxiliary lever (6), auxiliary lever (6) is provided with displacement detecting sheet (5), displacement detector (4) places below the displacement detecting sheet (5), auxiliary lever (6) one ends are made as fulcrum 02, the other end is provided with bias spring zeroing device (8), be equipped with two ticklers (11) on the auxiliary lever (6), two ticklers (11) place respectively permanent magnet (10) S, N extremely in the middle of and N, S extremely in the middle of, displacement detector (4) is connected with tickler (11) by detection amplifying circuit (7) and resistance (13).
2. digital system for liquid specific density measurement according to claim 1 is characterized in that, is equipped with magnetic shunt path set screw (9) at described permanent magnet (10) one side S on extremely.
3. digital system for liquid specific density measurement according to claim 1 is characterized in that, at described detection amplifying circuit (7) by Rw, Rx, R
1Bridge circuit of forming and amplifier A form, and Rx is the impedance of displacement detector (4) medium-high frequency oscillator, R
0For being connected to the pull-up resistor of amplifier A output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100261214A CN100389316C (en) | 2005-05-24 | 2005-05-24 | Digital system for liquid specific density measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100261214A CN100389316C (en) | 2005-05-24 | 2005-05-24 | Digital system for liquid specific density measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1699959A CN1699959A (en) | 2005-11-23 |
| CN100389316C true CN100389316C (en) | 2008-05-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100261214A Expired - Fee Related CN100389316C (en) | 2005-05-24 | 2005-05-24 | Digital system for liquid specific density measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100389316C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629890B (en) * | 2009-08-17 | 2011-07-06 | 昆明理工大学 | Float type fiber grating liquid densimeter |
| CN108956373B (en) * | 2018-08-01 | 2023-11-07 | 湖北理工学院 | Automatic density measuring device and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203504U (en) * | 1985-08-20 | 1986-04-30 | 唐发仁 | Lever-type density readout for solid and liquid |
| JPH1073525A (en) * | 1996-08-30 | 1998-03-17 | Shimadzu Corp | Measuring apparatus for specific gravity |
| JPH10148609A (en) * | 1996-11-18 | 1998-06-02 | Kyoto Electron Mfg Co Ltd | Measuring device for amount and specific gravity of liquid |
| CN2325772Y (en) * | 1997-04-25 | 1999-06-23 | 赵万山 | Digital displaying type instrument for investigating density |
| JP2000074810A (en) * | 1998-08-31 | 2000-03-14 | Morikawa Sangyo Kk | Liquid specific gravity measuring device |
| GB2365982A (en) * | 2000-08-18 | 2002-02-27 | Sg Measurement Ltd | Liquid density measurement apparatus |
-
2005
- 2005-05-24 CN CNB2005100261214A patent/CN100389316C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203504U (en) * | 1985-08-20 | 1986-04-30 | 唐发仁 | Lever-type density readout for solid and liquid |
| JPH1073525A (en) * | 1996-08-30 | 1998-03-17 | Shimadzu Corp | Measuring apparatus for specific gravity |
| JPH10148609A (en) * | 1996-11-18 | 1998-06-02 | Kyoto Electron Mfg Co Ltd | Measuring device for amount and specific gravity of liquid |
| CN2325772Y (en) * | 1997-04-25 | 1999-06-23 | 赵万山 | Digital displaying type instrument for investigating density |
| JP2000074810A (en) * | 1998-08-31 | 2000-03-14 | Morikawa Sangyo Kk | Liquid specific gravity measuring device |
| GB2365982A (en) * | 2000-08-18 | 2002-02-27 | Sg Measurement Ltd | Liquid density measurement apparatus |
Non-Patent Citations (2)
| Title |
|---|
| 自动测定液体密度的实验研究. 沈才康，韦娜.大学物理实验 ，第12卷第4期. 1999 |
| 自动测定液体密度的实验研究. 沈才康，韦娜.大学物理实验，第12卷第4期. 1999 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1699959A (en) | 2005-11-23 |
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Granted publication date: 20080521 Termination date: 20110524 |