CN1022950C - Moisture content measuring instrument for pine resin - Google Patents
Moisture content measuring instrument for pine resin Download PDFInfo
- Publication number
- CN1022950C CN1022950C CN 91102545 CN91102545A CN1022950C CN 1022950 C CN1022950 C CN 1022950C CN 91102545 CN91102545 CN 91102545 CN 91102545 A CN91102545 A CN 91102545A CN 1022950 C CN1022950 C CN 1022950C
- Authority
- CN
- China
- Prior art keywords
- circuit
- sample
- input end
- output terminal
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 235000008331 Pinus X rigitaeda Nutrition 0.000 title 1
- 235000011613 Pinus brutia Nutrition 0.000 title 1
- 241000018646 Pinus brutia Species 0.000 title 1
- 239000011347 resin Substances 0.000 title 1
- 229920005989 resin Polymers 0.000 title 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims abstract description 23
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims abstract description 23
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000000052 comparative effect Effects 0.000 claims description 6
- 238000000605 extraction Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000003245 working effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 238000005070 sampling Methods 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004821 distillation Methods 0.000 description 2
- 239000001293 FEMA 3089 Substances 0.000 description 1
- 241000408529 Libra Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000007912 intraperitoneal administration Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a measuring device for the water content of rosin, which consists of a sample capacitance box, a coaxial cable, a sampling circuit, a standard circuit, a triggering circuit, a comparing circuit, a time delay circuit, a display circuit and a power circuit. The measuring device is simple to operate, fast and accurate, light in self weight, convenient to carry, free of limitation of environment and use conditions, and capable of being widely applied to rural and field purchasing sites with a large number of rosin samples.
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
oBe 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, CA, 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 chronotron 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], adjusting knob [5], power switch [8] are 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 basic pulse 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 arteries and veins, 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
2Adjusting 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 the LED of Sheffer stroke gate U4:A, U4:B
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
2The reading that indicates on the adjusting knob index dial is learnt the water percentage of rosin to be measured; R
6, R
7Play metering function; U2:B, C
4, R
5, C
5, R
8Forming delay circuit, [Q] end and the U4:A[15-2 of U2:B] [16-2] of end, U4:B be connected, and postpones a period of time by [Q] end control display of U2:B and for example just worked in 1 minute, and purpose is to stablize a period of time to sample, to reduce error.
Claims (1)
1, a kind of fo moisture content in rosin measurement mechanism comprises a capacitive transducer (the sample electric capacity box that has parallel plate electrode) and parameter measuring apparatus, and two parts are disconnected from each other, is connected by a concentric cable, it is characterized in that:
Described sample electric capacity box [9] is made up of the pole plate of two parallel symmetries adorning in housing and the housing at least, and limit end extraction electrode is connected with an end of concentric cable [10], is used for the splendid attire sample to be tested;
Described parameter measurement partly comprises
A, a resistance R
1Insert voltage source composition RC circuit by concentric cable [10] and electric series connection of sample electric capacity box [9], to obtain sampled signal;
B, one have the sample circuit [11] of two input ends [RC], [B], the other end that [RC] end connects concentric cable [10], be used to take out the sawtooth pulse signal of the RC=τ that changes by index law, and export the losing side ripple signal of a pulse width by the RC decision at its output terminal [Q];
The basic pulse generator [12] of c, RC=τ that output pulse width is adjustable is used to produce a known τ standard negative pulse square wave signal, is exported by output terminal [Q];
D, a trigger [14], its output terminal [Q] are sent a narrow negative pulse and are transported to the input end [B] of sample circuit [11] and the input end [B] of τ basic pulse generator [12] simultaneously, are used to trigger this two circuit synchronous workings;
E, a comparer [13], its input end [D] is connected with the output terminal [Q] of sample circuit [11], input end [CLK] is connected with the output terminal [Q] of τ basic pulse generator [12], be used for the negative pulse square-wave signal that these two circuit 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];
[Q] of f, a chronotron [17] end is connected with input end [15-2], [16-2] of described display [15], [16], is used to control display [15], [16] and prolongs chi a period of time and just show comparative result;
G, a described display [15], [16], its output state are determined by the state of its corresponding input end [15-1], [16-1], are used to show whether sample to be tested and standard reach balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102545 CN1022950C (en) | 1991-03-29 | 1991-03-29 | Moisture content measuring instrument for pine resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102545 CN1022950C (en) | 1991-03-29 | 1991-03-29 | Moisture content measuring instrument for pine resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1065528A CN1065528A (en) | 1992-10-21 |
| CN1022950C true 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 | Moisture content measuring instrument for pine resin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022950C (en) |
Families Citing this family (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 |
| GB2559791B (en) * | 2017-02-20 | 2021-10-20 | Skf Ab | A 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
Also Published As
| Publication number | Publication date |
|---|---|
| CN1065528A (en) | 1992-10-21 |
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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 |