CN1065528A - A kind of tester fo moisture content in rosin - Google Patents
A kind of tester fo moisture content in rosin Download PDFInfo
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- CN1065528A CN1065528A CN 91102545 CN91102545A CN1065528A CN 1065528 A CN1065528 A CN 1065528A CN 91102545 CN91102545 CN 91102545 CN 91102545 A CN91102545 A CN 91102545A CN 1065528 A CN1065528 A CN 1065528A
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- China
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- rosin
- output terminal
- input end
- sample
- circuit
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Abstract
The invention discloses a kind of tester of moisture content in rosin, it is made up of sample electric capacity box, concentric cable, sampling, standard, triggering, comparison, time-delay, demonstration and power circuit.Utilize water cut in the rosin different and cause the variable quantity of electrical quantity, compare by electrical quantity, thereby determine tested fo moisture content in rosin with the rosin of a known moisture content.This measurement mechanism is simple to operate, quick and precisely, from heavy and light, be easy to carry, not limited by environment and service condition, can be widely used in the rural area of large quantities of rosin samples, open-air purchase is on-the-spot.
Description
The invention belongs to the physical quantity technical field, relate in particular to a kind of tester of moisture content in rosin.
From forest zone purchase rosin, for preventing turpentine oil volatile, the peasant will add water in rosin, because water mixing is random, the watering quantity of different vessels differs greatly, and the water content in the general rosin is between 5%～20%.
The measuring method of known fo moisture content in rosin and device adopt the way of distillation.The moisture rosin that takes a morsel is weighed the back with the terebinthina dilution, puts into distiller, distills out moisture content, claims the weight of moisture content again, divided by the former weight of rosin, draws the content of moisture content with moisture content weight.This known measuring method and device significant disadvantages are that the time of usefulness is long, and surveying once needs 30～60 minutes.
Another shortcoming of this known measuring method and device need be not easy in the rural area with heavy experimental facilities such as a large amount of terebinthina and electric furnace, Libra, distiller, open-air purchase is on-the-spot uses.
The objective of the invention is for avoiding these shortcomings and difficulty, provide a kind of light, be easy to carry about with one, be suitable for the on-the-spot tester fo moisture content in rosin that use, that can measure water content in the rosin rapidly and accurately of the open-air purchase in rural area.
Task of the present invention is achieved in that owing to the different variable quantities that cause electrical quantity of water cut in the rosin to be measured, compares with the variable quantity of the electrical quantity of the rosin of this variable quantity and a known moisture content, when balance, two values are equal.Design concept:
For capacitor, the electric capacity between two parallel plate electrodes
C∝ε
rε. (S)/(d)
ε wherein. be permittivity of vacuum, ε
rFor relative dielectric constant, S are that the area d of pole plate is the distance between two-plate.
If between the electric capacity two-plate be the rosin that contains moisture content, if the water cut difference, according to the ε of above-mentioned relation formula correspondence
rAlso different with the value of C.Find out C and ε by prior experiment
rAnd the corresponding relation between the water cut has been measured electric capacity C and just can have been known the water cut of rosin, thereby realized that non electrical quantity is converted to the measurement of electric parameter, and in other words, fo moisture content in rosin can be determined by the amount of measuring capacitor C.
The measurement of capacitor C can be tried to achieve by the time constant that compares two circuit, promptly
If U
S=RC (dU(t))/(dt)+U
S(t)
U wherein
SBe voltage source, RC=τ be time constant (when the RC value not simultaneously, τ is also different), U
CBeing the voltage at electric capacity two ends, (t) is the unit interval.
For R
A, C
A, τ
A=R
AC
A
For R
B, C
B, τ
B=R
BC
B
If τ
A=τ
B, C then
A=(R
B)/(R
A) C
B
If C
BKnown, (R
B)/(R
A) known, then can obtain C
A
Take following technical solution according to above-mentioned design concept:
A sample electric capacity box, its equivalent capacity and a resistance are in series, and form the RC circuit that a time constant equals τ, insert voltage source, obtain sending into sample circuit at the electric capacity two ends by the sawtooth pulse that index law changes, square-wave pulse of sample circuit output, its pulsewidth is determined by τ; A known τ basic pulse generator is exported a τ standard square-wave pulse, and its pulsewidth scalable is selected; A trigger, the output trigger pulse is sent into described sample circuit and described τ basic pulse generator simultaneously, triggers this two circuit synchronous workings; A comparer, the square-wave pulse that described sample circuit and described τ basic pulse generator are sent here carries out peak pulse duration, and comparative result is delivered to display; A described display shows comparative result after by a delayer control lag a period of time; A direct-flow voltage regulation source is used for to described sample circuit, τ basic pulse generator, trigger, comparer, chronotron, monitor power supply.
The water cut that use the present invention measures rosin is without any additives, and is easy to operate, rapid and simple, surveys once and only needs 1 minute, and work efficiency improves 30～60 times than the way of distillation; The accuracy height, measuring accuracy can reach 0.1%, because it is many to extract the sample total amount of measuring, thereby more can represent whole sample; Cost is low, and about 200 yuan of every cost need be with heavy, expensive experimental equipment; In light weight, the 2kg/ platform is easy to carry, and not limited by environment and service condition, and the field purchase that can be widely used in sample in enormous quantities is on-the-spot.
Fig. 1 is the configuration diagram of fo moisture content in rosin measuring instrument.
Fig. 2 is the configuration diagram of A type sample electric capacity box.
Fig. 3 is the axonometric drawing of capacitor plate.
Fig. 4 is the configuration diagram of Type B sample electric capacity box.
Fig. 5 is the axonometric drawing of capacitor plate.
Fig. 6 is the measuring principle block scheme.
Fig. 7 is the metering circuit schematic diagram.
Describe the embodiment that the present invention provides in detail below in conjunction with accompanying drawing.
Fig. 1 illustrates the structure of fo moisture content in rosin measuring instrument of the present invention.Socket (1), pilot lamp (4), (5) are turned round in adjusting, power switch (8) is installed on the front plate of housing (7), printed circuit board (PCB) (2), battery case (6) are installed on the intraperitoneal of housing (7), concentric cable (10) is used to connect sample electric capacity box (9) and socket (1), front end leaves window (3) above the housing, so that observed reading.
In Fig. 2, Fig. 3, sample electric capacity box (9) is made with the little insulating material of dielectric loss, cover mouth above the box body, sandwich the capacitor plate (9-2) of conducting metal thin plate between parallel symmetrical fitting insulating panels in box body both sides (9-1) and the insulcrete (9-3), at limit end extraction electrode (9-4) and electrode (9-5), the surrounding sealing, pole plate (9-2) can be made various plane geometric shapes, but essential its area that guarantees is at 1cm
2～1000cm
2Between, the distance between the two-plate is between 1cm～15cm.
Sample electric capacity box (9) also can be made the such structure of Fig. 4.Cover mouth above the box body, in the box body chamber, installing a capacitor plate (9-7) that between insulcrete (9-6) and insulcrete (9-8), sandwiches the conducting metal thin plate as shown in Figure 5 on the basis of Fig. 2 additional, limit end extraction electrode (9-10), with the conductor extraction electrode (9-9) that is connected, this structure can increase volume and electric capacity to the pole plate of both sides at the limit end.
Fig. 6 is the measuring principle block scheme.Sample electric capacity box (9) is used for splendid attire sample to be tested, the shielding of added metal box among the figure, prevents external electromagnetic interference.Sample electric capacity box (9) is by concentric cable (10) and resistance R
1The access voltage source is in series, form the RC circuit that a time constant equals τ, the output terminal of sample electric capacity box (9) inserts the input end (RC) of sample circuit (11), produce one at this input end and press the sawtooth pulse that index law changes, this signal enters sample circuit (11), will export the negative pulse square wave of a pulsewidth by the RC decision at its output terminal (Q); τ basic pulse generator (12) is used to produce a known τ standard by output terminal (Q) output negative pulse square wave, and its pulsewidth can be regulated selected; Trigger (14) produces (B) end that a narrow negative pulse is delivered to sampling electricity (11) and τ basic pulse generator simultaneously, to trigger this two circuit synchronous workings; Comparer (13) carries out peak pulse duration to the losing side wave impulse that sample circuit (11) and τ standard arteries and veins generator (12) are sent here, comparative result by its output terminal (Q), (Q) deliver to display (15) respectively, (16) show; Chronotron (17) is used to control display (15), (16) and postpones a period of time and treat that sample just works after stable; Direct-flow voltage regulation source (18) is used for providing working power to foregoing circuit.
Fig. 7 is the metering circuit schematic diagram.Sample electric capacity box (9) inserts jack CZ by the plug that concentric cable (10) connects
1With resistance R
1Be in series and insert voltage source composition RC circuit, the K that closes a switch, power supply E is by U5 voltage stabilizing, C
6Filtering is after R
1Equivalent capacity C to electric capacity box (9)
NCharging, be charged to equivalent capacity C behind certain level
NBy (RC) end discharge of U1:A, produce (RC) end that a sawtooth pulse signal that changes by index law is sent into U1:A again at this input end; Sample circuit is by U1:A, R
1, C
NA multivibrator of forming constitutes, and in its (Q) output square-wave pulse, its pulsewidth is by the τ decision of input end (RC); U1:B, R
2, W
1, C
1, C
2, C
7The multivibrator of forming constitutes the τ basic pulse generator, is used to produce a known τ standard, and τ is by R
1, W
1, C
2Value decision, at variable capacitance C
2The adjusting turn-knob on the index dial that indicates rosin water percentage and the corresponding scale of capacitance is housed, adjusting C
2Can change the pulse width of U1:B output terminal (Q) output, C
1, C
7Be building-out capacitor, be used for distributed capacitance that the balancing a survey input end causes because of wiring, to reduce error; U2:A, R
3, C
3, R
4Constitute trigger circuit, also be multivibrator, wherein a R
3, C
3Form RC network, (B) that trigger pulse is delivered to U1:A, U1:B simultaneously by (Q) output of U2:A holds, to trigger sample circuit and τ basic pulse generator synchronous working; U3:A is the comparer that d type flip flop constitutes, its input end (D) is connected with (Q) end of U1:A, input end (CLK) is connected with (Q) end of U1:B, the losing side wave impulse that the τ basic pulse generator that the sample circuit that is made of U1:A and U1:B are constituted is sent here is carried out peak pulse duration, and comparative result is sent into display and shown; Display is by Sheffer stroke gate U4:A, U4:B and LED
1, LED
2, resistance R
6, R
7Form, when the square-wave pulse of sample circuit and τ basic pulse generator output compares through comparer, when pulsewidth is consistent, the input end of U4:A (15-1) is a high level, output terminal (15-3) is a pulse square wave, the input end of U4:B (16-1) is a high level, and output terminal (16-3) is a pulse square wave, LED
1, LED
2Pulse current is all arranged, because the inertia effect of naked eyes vision, so feel that two light emitting diodes are simultaneously luminous, represent that sample to be tested reaches balance with standard this moment; From C
2Regulate the reading that indicates on the turn-knob index dial and learn the water percentage of rosin to be measured; R
6, R
7Play metering function; U2:B, C
4, R
5, C
5, R
8Form delay circuit, (Q) end of U2:B is connected with (16-2) of U4:A (15-2) end, U4:B, (Q) end control display by U2:B postpones for example just work in 1 minute of a period of time, purpose is to stablize a period of time to sample, to reduce error.
Claims (1)
1, a kind of tester of moisture content in rosin is characterized in that:
The sample electric capacity box [9] of at least two parallel symmetrical pole plates is equipped with in-one box body side, it is to be located away from the outer parts of housing, be used for the splendid attire sample to be tested, its limit end extraction electrode is connected with an end of concentric cable [10], and described sample electric capacity box [9] is by the other end and a resistance R of described concentric cable [10]
1The access voltage source that is in series, the output terminal of described sample electric capacity box [9] is connected with [RC] input end of sample circuit [11];
-one described sample circuit [11] that two input ends [RC], [B] are arranged is used to take out the sawtooth pulse signal by the RC=τ of index law variation, at the losing side ripple signal of pulse width of its output terminal [Q] output by the RC decision;
The basic pulse generator [12] of the RC=τ that-one output pulse width is adjustable is used to produce a known τ standard negative pulse square wave signal, is exported by its output terminal [Q];
-one trigger [14] is sent a narrow negative pulse by its output terminal [Q] and is transported to the input end [B] of described sample circuit [11] and the input end [B] of described τ basic pulse generator [12] simultaneously, is used to trigger this two circuit synchronous workings;
-one comparer [13], its input end [D] is connected with the output terminal [Q] of described sample circuit [11], input end [CLK] is connected with the output terminal [Q] of described τ basic pulse generator [12], be used for the losing side wave pulse signal that described sample circuit [11] and described τ basic pulse generator [12] are sent here is carried out peak pulse duration, comparative result is sent into input end [15-1], [16-1] of display [15], [16] respectively by its output terminal [Q], [Q];
The input end [15-2] of-one described display [15], [16], [16-2] are connected with output terminal [Q], [Q] of described comparer [13] respectively, and the output state of described display [15], [16] is determined by the state of its input end [15-1], [16-1];
[Q] of-one chronotron [17] end is connected with [15-2], [16-2] end of described display [15], [16], is used to control described display [15], [16] delay a period of time and just shows comparative result;
-one direct-flow voltage regulation source [18], be used for sample circuit [11], τ basic pulse generator [12], trigger [14], comparer [13], chronotron [17], display [15], [16] power supply to described RC circuit;
-one housing [7] is used to install electric zero, parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102545 CN1022950C (en) | 1991-03-29 | 1991-03-29 | Tester fo moisture content in rosin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102545 CN1022950C (en) | 1991-03-29 | 1991-03-29 | Tester fo moisture content in rosin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1065528A true CN1065528A (en) | 1992-10-21 |
| CN1022950C CN1022950C (en) | 1993-12-01 |
Family
ID=4905647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91102545 Expired - Fee Related CN1022950C (en) | 1991-03-29 | 1991-03-29 | Tester fo moisture content in rosin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022950C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651833A (en) * | 2014-11-15 | 2016-06-08 | 新疆科立机械设备有限公司 | A method of measuring the water content of a granular material based on capacitance |
| CN108459057A (en) * | 2017-02-20 | 2018-08-28 | 斯凯孚公司 | The method and system of condition monitoring |
| CN111562292A (en) * | 2020-06-17 | 2020-08-21 | 东北林业大学 | Novel standing timber sapwood moisture content measuring apparatu lives |
-
1991
- 1991-03-29 CN CN 91102545 patent/CN1022950C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651833A (en) * | 2014-11-15 | 2016-06-08 | 新疆科立机械设备有限公司 | A method of measuring the water content of a granular material based on capacitance |
| CN108459057A (en) * | 2017-02-20 | 2018-08-28 | 斯凯孚公司 | The method and system of condition monitoring |
| CN111562292A (en) * | 2020-06-17 | 2020-08-21 | 东北林业大学 | Novel standing timber sapwood moisture content measuring apparatu lives |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1022950C (en) | 1993-12-01 |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |