CN209387447U - A kind of liquid absorbent test device - Google Patents
A kind of liquid absorbent test device Download PDFInfo
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- CN209387447U CN209387447U CN201821587718.5U CN201821587718U CN209387447U CN 209387447 U CN209387447 U CN 209387447U CN 201821587718 U CN201821587718 U CN 201821587718U CN 209387447 U CN209387447 U CN 209387447U
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- 239000007788 liquid Substances 0.000 title claims abstract description 34
- 239000002250 absorbent Substances 0.000 title claims abstract description 28
- 230000002745 absorbent Effects 0.000 title claims abstract description 28
- 238000006073 displacement reaction Methods 0.000 claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 230000006698 induction Effects 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 45
- 239000002594 sorbent Substances 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 15
- 238000005303 weighing Methods 0.000 abstract description 11
- 239000003463 adsorbent Substances 0.000 abstract description 9
- 230000009102 absorption Effects 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 3
- 238000003795 desorption Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 3
- -1 permanent magnet Substances 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000005526 G1 to G0 transition Effects 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000486406 Trachea Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The utility model relates to gas absorptions relevant to adsorbent, desorption technology field, a kind of liquid absorbent test device, including micro- balance, hanger bar, electromagnet, test chamber, blow vent, permanent magnet, steel wire, displacement sensor, induction coil, standard sample, support level, pallet I, bracket, pallet II, connecting tube, sample cavity, tracheae I, tracheae II, light source, video camera, divider resistance, DC power supply, feed circuit, computer and displacement platform, characteristic of the gas in liquid absorbent is studied using the method that magnetic force weighing is combined with optical detection, the weighing measurement of adsorption process is carried out using the electromagnet with stable operating current, improve the precision of weighing results, using special air intake structure, make it possible to change gas in the case where being changed without sample and enters liquid absorbent The shape of single isolated bubbles in liquid absorbent can be observed and be recorded to rate, the research of the interaction for gas and liquid absorbent.
Description
Technical field
The utility model relates to gas absorption relevant to adsorbent, desorption technology field, especially a kind of magnetic force weighing
A kind of liquid absorbent test for combining method with optical detection to study characteristic of the gas in liquid absorbent
Device.
Background technique
Absorption is important chemical operation process, is widely used in petroleum, chemical industry, metallurgy, food, medicine and other fields,
Basic principle is that the gas of flowing or liquid are contacted and interacted with adsorbent, so that gas or liquid to be adsorbed
In fractions be adsorbed by adsorbent, to achieve the purpose that separate gas or liquid to be adsorbed, adsorbent can be liquid
Body or solid can be stationary phase or mobile phase.Weighing technique is to study a kind of common method of adsorption process, passes through weighing
Weight of the adsorbent of certain mass before and after absorption studies the characteristics such as its adsorption capacity and density, still, in the prior art
It is contactlessly weighed to sample by the attraction between magnet to reach, the electric current of electromagnet is provided by DC power supply,
The fluctuation of the output electric current of DC power supply greatly influences the stability in the magnetic field that electromagnet generates, to cause weighing results
Error, a kind of liquid absorbent test device are able to solve problem.
Utility model content
To solve the above-mentioned problems, the utility model feed circuit and DC power supply phase simple and at low cost using structure
In conjunction with method stable electric current is provided for electromagnet so that the result precision of adsorbent weighed is high, in addition, using special
Air intake structure, the shape of single isolated bubbles in liquid absorbent can be studied.
The technical scheme adopted by the utility model is
A kind of liquid absorbent test device includes micro- balance, hanger bar, electromagnet, test chamber, blow vent I, forever
Magnet, displacement sensor, induction coil, standard sample, support level I, pallet I, bracket, pallet II, support level II, connects steel wire
Adapter tube, sample cavity, tracheae I, tracheae II, blow vent II, light source, video camera, divider resistance, DC power supply, feed circuit, calculating
Machine and displacement platform, xy z are three-dimensional coordinate system, micro- day flushconnection computer, feed circuit connection computer, test chamber packet
The chamber I connected from top to bottom and chamber II are included, micro- balance position is fixed, and electromagnet is connected to below micro- balance by hanger bar, energy
The length that hanger bar is enough adjusted by micro- balance enables to electromagnet mobile in the direction y, and the inner wall of chamber I is installed from top to bottom
There are blow vent I, support level I and support level II, the permanent magnet, steel wire, displacement sensor, induction coil, standard sample, pallet
I, bracket and pallet II are sequentially located at from top to down in chamber I, and induction coil is located at displacement sensor two sides, for detecting displacement
Inductor the direction y displacement and be input to computer；Standard sample is inertia, adsorbed gas for the adsorbed gas tested
It will not be adsorbed by standard sample, weight m of the standard sample in vacuum environmentrvacAnd volume VrvacIt is known；Computer can
The displacement sensor that the preset value and induction coil being displaced according to the permanent magnet of input in the direction y measure leads in the displacement in the direction y
Micro- balance is crossed to adjust the length of hanger bar, the position of permanent magnet can be adjusted with this；The permanent magnet, displacement sensor, support
Relative position is constant between disk I and pallet II and is sequentially connected by steel wire, the permanent magnet, displacement sensor, pallet I and support
Disk II can be integrally mobile in the direction y, and standard sample is placed on support level I, and standard sample has the through-hole in the vertical direction y, steel
Silk contactlessly passes through the through-hole, and when permanent magnet is located at initial position, pallet I is located at below standard sample at 2 millimeters, when
Permanent magnet along y positive direction move up more than 2 millimeters apart from when, standard sample can be lifted up by pallet I, so that standard
Sample is separated with support level I, and pallet II is limited in bracket, and the side of bracket has a flange below, bracket be located at support level I and
Between support level II, the initial position of bracket is the position that the flange is contacted with support level II, when permanent magnet is from initial position
Along y positive direction move up more than 6 millimeters apart from when, bracket can be lifted up by pallet II, so that bracket and support level II
Separation；The DC power supply has output end and control terminal, and output end outputs current to electromagnet, and there is output end output to rectify
Pole and cathode, control terminal have control terminal anode and cathode, output head anode, divider resistance, electromagnet and negative pole of output end according to
Secondary connection forming circuit, the resistance value of divider resistance are RS=1 ohm；Feed circuit exports analog voltage to the DC power supply
Control terminal can control the output electric current of DC power supply, it is known that response of the DC power output end to the voltage signal of control terminal
Delay time be 5 milliseconds；The connecting tube, sample cavity, tracheae I, tracheae II and displacement platform are respectively positioned in chamber II, the support
Frame, connecting tube and sample cavity are sequentially connected from top to bottom, have unidirectional stomata above sample cavity, and gas can only lead to from bottom to top
The unidirectional stomata is crossed, the gas in sample cavity can enter connecting tube and chamber I by the unidirectional stomata, and tracheae II is fixed on
Sample cavity is in the following, the top and bottom of tracheae II penetrate through, and the upper end of tracheae II is located in sample cavity, lower ending opening is in chamber II,
The outer diameter of tracheae II is 2.8 millimeters, internal diameter is 2.4 millimeters, and tracheae I is nested in the outside of tracheae II, and tracheae I internal diameter is 4 millimeters,
The upper end of tracheae I seals, and upper end of the interior upper surface of tracheae I apart from tracheae II is 3 millimeters, and the lower end of tracheae I is apart from sample cavity
Interior bottom surface be 1 millimeter, the upper end of tracheae I and sample cavity it is interior above by displacement platform connection, by described in wireless remote control
Displacement platform enables to tracheae I relative sample chamber to move in the y-direction, and enables to the interior bottom of the lower end tracheae I and sample cavity
Face contact simultaneously has air-tightness, and chamber II has blow vent II；There is sample of sorbent, the light that light source issues can lead in sample cavity
Cross chamber II, sample cavity is irradiated in sample of sorbent, cameras view sample of sorbent, permanent magnet, steel wire, displacement can be passed through
Inductor, pallet I, bracket, pallet II, connecting tube, sample cavity, tracheae I, tracheae II and displacement platform weight be it is known and
Buoyancy in gas is ignored；The lower end tracheae I be an internal diameter be 4 millimeters, 8 millimeters of outer diameter, a height of 2 millimeters of annulus, institute
The side for stating annulus has the micro- stomata of truncated cone-shaped of perforation, and opening diameter of the micro- stomata on the inside of annulus is 1 millimeter, in circle
Opening diameter on the outside of ring is 0.05 millimeter；Feed circuit includes reference voltage integrated circuit, capacitor I, capacitor II, resistance I, electricity
Hinder II, operational amplifier I, resistance III, resistance IV, operational amplifier II, resistance V, capacitor III and operational amplifier III, base
Quasi- voltage integrated circuit model MAX6225 has input, output end, ground terminal and noise suppressed end, operational amplifier
I, the model of operational amplifier II and operational amplifier III be OPA4228, all have normal phase input end, inverting input terminal and
Output end, by reference voltage integrated circuit, capacitor I, capacitor II, resistance I, resistance II, operational amplifier I, resistance III, resistance
The reference voltage circuit part of IV and operational amplifier II composition feed circuit, the noise suppressed end of reference voltage integrated circuit
The normal phase input end that capacitor I connects operational amplifier I with resistance II is passed sequentially through, the output end of reference voltage integrated circuit is logical
The normal phase input end of resistance I connection operational amplifier I, the ground terminal ground connection of reference voltage integrated circuit are crossed, reference voltage integrates
The input terminal of circuit keeps constant pressure 15V, and the effect of divider resistance is that the output electric current of DC power supply is converted to voltage VSInput
One end ground connection that the output head anode of feed circuit, divider resistance and DC power supply connects, the divider resistance other end connect operation
The normal phase input end of amplifier III；The inverting input terminal of operational amplifier I is connected with the output end of operational amplifier I, operation
The output end of amplifier I passes through the inverting input terminal of resistance III connection operational amplifier II, the anti-phase input of operational amplifier II
End passes through the output end of resistance IV connection operational amplifier II, the positive input end grounding of operational amplifier II, operational amplifier
The output end of II passes through the inverting input terminal of resistance V connection operational amplifier III, and the output end of operational amplifier II exports electricity
Press VR；Operational amplifier III, capacitor III and resistance V constitute operation amplifier integrating circuit part, and operational amplifier III's is anti-
Phase input terminal passes through the output end of capacitor III connection operational amplifier III, the output end output control electricity of operational amplifier III
Press VCTo the control terminal anode of DC power supply, the time constant of operation amplifier integrating circuit part is 5 milliseconds, defeated with DC power supply
Outlet is identical to the delay time of the response of the voltage signal of control terminal, and the capacitance of capacitor III is 2.2 microfarads, the resistance of resistance V
Value is 3.2 kilo-ohms, and the capacitance of capacitor I is 1 microfarad, and the capacitance of capacitor II is 2.2 microfarads, and the resistance value of resistance I is 20 kilo-ohms,
The resistance value of resistance II is 4 kilo-ohms, and the resistance value of resistance III is 4 kilo-ohms, and the resistance value of resistance IV is 5 kilo-ohms.
Computer changes the principle of the position of permanent magnet by adjusting the length of hanger bar:
The preset value that input permanent magnet is displaced in the direction y in a computer, the computer preset value and the line of induction
The displacement sensor measured is enclosed in the displacement in the direction y, adjusts the length of hanger bar by micro- balance to change the position of electromagnet
It sets, since the electric current of DC supply input to electromagnet is constant, the magnetic field that electromagnet generates is constant, due to permanent magnet change in location
And lead to the weight change connected below, in order to enable permanent magnet is able to maintain suspended state, between electromagnet and permanent magnet
Attraction also change, relative position can also change between electromagnet and permanent magnet, and computer need to be more described pre- again
If the displacement sensor that value and induction coil measure is in the displacement in the direction y, until permanent magnetism body position reaches the preset value of displacement.
The working principle of feed circuit:
Feed circuit includes reference voltage circuit part, operation amplifier integrating circuit part, it is therefore an objective to by DC power supply
Outputting current steadily is in I0, the reference voltage electricity for exporting electric current and passing through resistance value for 10 ohm of electromagnet, in feed circuit
Road part generates reference voltage VR, VR=I0RS, the reference voltage VRIn operation amplifier integrating circuit part and by divider resistance
The voltage V of conversionSIntegration operation is carried out again after carrying out subtraction operation, and control voltage V is exported by operation amplifier integrating circuit partC
To the control terminal of DC power supply, the output electric current of DC power supply is controlled with this.
Using a kind of liquid absorbent test method, be able to carry out through weighing method study liquid absorbent and
Observe bubble shape of the gas in liquid absorbent.
By weighing method come the step of studying liquid absorbent are as follows:
One, is by known volume V1And weight in vacuo m0vavSample of sorbent be placed in sample cavity；
Two, adjust the length of hanger bar by computer, so that permanent magnet is moved up from initial position along positive y-direction
8 millimeters, so that standard sample is separated with support level I, so that bracket is separated with support level II；
Adsorbed gas is passed through chamber I from blow vent I by three, and air flow velocity is 5 to 10SCCM, duration T, the range of T
It is 30 minutes to 5 hours；
Four, adsorbed gases by the gap between support level II and connecting tube enter chamber II after being passed through chamber I from blow vent I,
And tracheae I is entered by the lower end tracheae II from bottom to up, finally enter sample cavity from the lower end tracheae I, with liquid absorbent sample
Contact；
Five, stop being passed through adsorbed gas from blow vent I to chamber I, and stand device five minutes；
Six, measure the total weight m of sample of sorbent and standard sample in adsorbed gas environment by micro- balance1+mr；
Seven, adjust the length of hanger bar by computer, so that permanent magnet moves down 6 millimeters along negative y-direction, so that
Bracket returns to initial position；
Total weight m of eight, by micro- balance measurement standard sample in adsorbed gas environmentr, adsorbent sample is calculated
Weight m of the product in adsorbed gas environment1；
The density of adsorbed gas is calculated in nine,
Ten, calibrate the buoyancy in weight measurement, the actual weight after sample of sorbent adsorbed gas is calculated
m1vac=m1+V1ρg；
11, compare weight change of the sample of sorbent before and after adsorbed gas, and are passed through the duration T of gas,
Sample of sorbent is studied to the adsorption capacity of gas with various.
The step of observing bubble shape of the gas in liquid absorbent are as follows:
Step 1 adjusts the length of hanger bar by computer, so that permanent magnet is upward along positive y-direction from initial position
It is 8 millimeters mobile, so that standard sample is separated with support level I, so that bracket is separated with support level II；
Step 2 moves tracheae I relative sample chamber in the y-direction by wireless remote control displacement platform, and makes tracheae I
The interior bottom face contact of lower end and sample cavity simultaneously has air-tightness；
Adsorbed gas is passed through chamber II from blow vent II by step 3, adsorbed gas by the lower end tracheae II from bottom to up into
Enter tracheae I, finally enters sample cavity from micro- stomata of the lower end tracheae I, contacted with liquid absorbent sample；
Step 4 adjusts the adsorbed gas flow velocity that chamber II is passed through from blow vent II, so that gas is in the form of single isolated bubbles
Enter sample cavity from micro- stomata；
Step 5, light transit chamber II, the sample cavity of light source sending are irradiated to sample of sorbent, pass through cameras view and remember
The liquid level position and bubble for recording sample of sorbent are in a liquid from generating change in shape into shattering process；
Step 6, the bubble shape information collected according to video camera analyze the phase interaction of gas and liquid absorbent
With.
The beneficial effects of the utility model are:
The utility model carries out the weighing measurement of adsorption process using the electromagnet with stable operating current, improves
The precision of weighing results, in addition, using special air intake structure, make it possible to change in the case where being changed without sample gas into
Enter the rate of liquid absorbent, can observe and record the shape of single isolated bubbles in liquid absorbent.
Detailed description of the invention
It is further illustrated below with reference to the figure of the utility model:
Fig. 1 is utility model diagram；Fig. 2 is tracheae I and tracheae II end portion positional relationship enlarged diagram；
Fig. 3 is the bottom view of Fig. 2；Fig. 4 is feed circuit schematic diagram.
In figure, 1. micro- balances, 2. hanger bars, 3. electromagnet, 4. test chambers, 4-1. chamber I, 4-2. chamber II, 5. blow vent I,
6. permanent magnet, 7. steel wires, 8. displacement sensors, 9. induction coils, 10. standard samples, 11. support level I, 12. pallet I, 13.
Bracket, 14. pallet II, 15. support level II, 16. connecting tubes, 17. sample cavities, the 18. micro- stomatas of tracheae I, 18-1., 19. tracheaes
II, 20. blow vent II, 21. light sources, 22. video cameras, 23. divider resistances, 24. DC power supplies, 25. feed circuits, 25-1. base
Quasi- voltage integrated circuit, 25-2. capacitor I, 25-3. capacitor II, 25-4. resistance I, 25-5. resistance II, 25-6. operational amplifier
I, 25-7. resistance III, 25-8. resistance IV, 25-9. operational amplifier II, 25-10. resistance V, 25-11. capacitor III, 25-
12. operational amplifier III, 26. computers, 27. displacement platforms.
Specific embodiment
If Fig. 1 is utility model diagram, xy z is three-dimensional coordinate system, including micro- balance 1, hanger bar 2, electromagnetism
Iron 3, test chamber 4, blow vent I5, permanent magnet 6, steel wire 7, displacement sensor 8, induction coil 9, standard sample 10, support level
I11, pallet I12, bracket 13, pallet II14, support level II15, connecting tube 16, sample cavity 17, tracheae I 18, tracheae II19, lead to
Port II20, light source 21, video camera 22, divider resistance 23, DC power supply 24, feed circuit 25, computer 26 and displacement platform 27,
Micro- balance 1 connects computer 26, and feed circuit 25 connects computer 26, test chamber 4 include the chamber I4-1 connected from top to bottom and
Chamber II4-2, micro- 1 position of balance are fixed, and electromagnet 3 is connected to micro- 1 lower section of balance by hanger bar 2, can be adjusted by micro- balance 1
The length for saving hanger bar 2 enables to electromagnet 3 mobile in the direction y, and the inner wall of chamber I4-1 is equipped with blow vent from top to bottom
I5, support level I11 and support level II15, the permanent magnet 6, steel wire 7, displacement sensor 8, induction coil 9, standard sample 10,
Pallet I12, bracket 13 and pallet II14 are sequentially located at from top to down in chamber I4-1, and induction coil 9 is located at 8 liang of displacement sensor
Side, for detecting displacement sensor 8 in the displacement in the direction y and being input to computer 26；Standard sample is for the absorption tested
Gas is inertia, and adsorbed gas will not be adsorbed by standard sample, weight m of the standard sample in vacuum environmentrvacAnd volume
VrvacIt is known；The DC power supply 24 has output end and control terminal, and output end exports constant current I0To electromagnet 3, output
End has output head anode and cathode, and control terminal has control terminal anode and cathode, output head anode, divider resistance 23, electromagnetism
Iron 3 and negative pole of output end are in turn connected to form circuit, and the resistance value of divider resistance 23 is RS=1 ohm；Feed circuit 25 exports mould
Intend voltage to the control terminal of the DC power supply 24, the output electric current of DC power supply 24 can be controlled, it is known that DC power supply 24 is defeated
Outlet is 5 milliseconds to the delay time of the response of the voltage signal of control terminal；Computer 26 can exist according to the permanent magnet 6 of input
The displacement sensor 8 that the preset value and induction coil 9 of the direction y displacement measure is adjusted in the displacement in the direction y by micro- balance 1
The length of hanger bar 2 can adjust the position of permanent magnet 6 with this；The permanent magnet 6, displacement sensor 8, pallet I12 and support
Relative position is constant between disk II14 and is sequentially connected by steel wire 7, the permanent magnet 6, displacement sensor 8, pallet I12 and
Pallet II14 can be integrally mobile in the direction y, and standard sample 10 is placed on support level I11, and standard sample 10 has the vertical direction y
Through-hole, steel wire 7 contactlessly pass through the through-hole, when permanent magnet 6 is located at initial position, pallet I12 is located at standard sample
10 lower section 2 millimeters at, when permanent magnet 6 along y positive direction move up more than 2 millimeters apart from when, pallet I12 can be by standard sample
Product 10 are lifted up, so that standard sample 10 is separated with support level I11, pallet II14 is limited in bracket 13, the side of bracket 13
Face has flange below, and for bracket 13 between support level I11 and support level II15, the initial position of bracket 13 is described convex
The position that edge is contacted with support level II15, when permanent magnet 6 from initial position along y positive direction move up more than 6 millimeters apart from when,
Bracket 13 can be lifted up by pallet II14, so that bracket 13 is separated with support level II15；The connecting tube 16, sample cavity
17, tracheae I18, tracheae II19 and displacement platform 27 are respectively positioned in chamber II4-2, the bracket 13, connecting tube 16 and sample cavity 17 from
Top to bottm is sequentially connected, and sample cavity 17 has unidirectional stomata above, and gas can only pass through the unidirectional stomata, sample from bottom to top
Gas in product chamber 17 can enter connecting tube 16 and chamber I4-1 by the unidirectional stomata, and tracheae II19 is fixed on sample cavity 17
In the following, the top and bottom of tracheae II19 penetrate through, the upper end of tracheae II19 is located in sample cavity 17, lower ending opening is in chamber II4-2
Interior, the outer diameter of tracheae II19 is 2.8 millimeters, internal diameter is 2.4 millimeters；Tracheae I18 is nested in the outside of tracheae II19, tracheae I18
Internal diameter is 4 millimeters, and the upper end of tracheae I18 seals, and upper end of the interior upper surface of tracheae I18 apart from tracheae II19 is 3 millimeters, tracheae
Interior bottom surface of the lower end of I18 apart from sample cavity 17 is 1 millimeter, and the upper end of tracheae I18 and the interior of sample cavity 17 pass through position above
Moving stage 27 connects, and by displacement platform 27 described in wireless remote control, tracheae I18 relative sample chamber 17 is enabled to move in the y-direction, and
It enables to the interior bottom face contact of the lower end tracheae I18 and sample cavity 17 and there is air-tightness, chamber II4-2 has blow vent
II20；There is in sample cavity 17 sample of sorbent, the light that light source 21 issues can transit chamber II4-2, sample cavity 17 be irradiated to suction
On attached dose of sample, can by video camera 22 observe sample of sorbent, permanent magnet 6, steel wire 7, displacement sensor 8, pallet I12,
Bracket 13, pallet II14, connecting tube 16, sample cavity 17, tracheae I18, tracheae II19 and displacement platform 27 weight be it is known and
Buoyancy in gas is ignored.
If Fig. 2 is tracheae I and tracheae II end portion positional relationship enlarged diagram, if Fig. 3 is the bottom view of Fig. 2, gas
The lower end pipe I18 be an internal diameter be 4 millimeters, 8 millimeters of outer diameter, a height of 2 millimeters of annulus, the side of the annulus has perforation
The truncated cone-shaped opening diameter of micro- stomata 18-1, micro- stomata 18-1 on the inside of annulus is 1 millimeter, the opening on the outside of annulus is straight
Diameter is 0.05 millimeter.
If Fig. 4 is feed circuit schematic diagram, feed circuit 25 includes reference voltage integrated circuit 25-1, capacitor I25-2, electricity
Hold II25-3, resistance I25-4, resistance II25-5, operational amplifier I25-6, resistance III25-7, resistance IV25-8, operation amplifier
Device II25-9, resistance V25-10, capacitor III25-11 and operational amplifier III25-12, reference voltage integrated circuit 25-1 type
Number be MAX6225, have input, output end, ground terminal and noise suppressed end, operational amplifier I25-6, operational amplifier
The model of II25-9 and operational amplifier III25-12 are OPA4228, all have normal phase input end, inverting input terminal and output
End, by reference voltage integrated circuit 25-1, capacitor I25-2, capacitor II25-3, resistance I25-4, resistance II25-5, operation amplifier
The reference voltage circuit of device I25-6, resistance III25-7, resistance IV25-8 and operational amplifier II25-9 composition feed circuit 25
Part, the noise suppressed end of reference voltage integrated circuit 25-1, which passes sequentially through capacitor I25-2 and connects operation with resistance II25-5, puts
The normal phase input end of big device I25-6, the output end of reference voltage integrated circuit 25-1 pass through resistance I25-4 connection operational amplifier
The normal phase input end of I25-6, the ground terminal ground connection of reference voltage integrated circuit 25-1, the input of reference voltage integrated circuit 25-1
End keeps constant pressure 15V, and the effect of divider resistance 23 is that the output electric current of DC power supply 24 is converted to voltage VSInput feedback electricity
Road 25, one end ground connection that divider resistance 23 is connected with the output head anode of DC power supply 24,23 other end of divider resistance connection fortune
Calculate the normal phase input end of amplifier III25-12；The inverting input terminal of operational amplifier I25-6 is defeated with operational amplifier I25-6's
Outlet is connected, and the output end of operational amplifier I25-6 passes through the reverse phase of resistance III25-7 connection operational amplifier II25-9
Input terminal, the inverting input terminal of operational amplifier II25-9 pass through the output of resistance IV25-8 connection operational amplifier II 25-9
End, the output end of the positive input end grounding of operational amplifier II25-9, operational amplifier II25-9 are connected by resistance V25-10
Meet the inverting input terminal of operational amplifier III25-12, the output end output voltage V of operational amplifier II25-9R；Operation amplifier
Device III25-12, capacitor III25-11 and resistance V25-10 constitute operation amplifier integrating circuit part, operational amplifier
The inverting input terminal of III25-12 passes through the output end of capacitor III25-11 connection operational amplifier III25-12, operational amplifier
The output end output control voltage V of III 25-12CTo the control terminal anode of DC power supply 24, operation amplifier integrating circuit part
Time constant be 5 milliseconds, it is identical to the delay time of the response of the voltage signal of control terminal as 24 output end of DC power supply, electricity
The capacitance for holding III 25-11 is 2.2 microfarads, and the resistance value of resistance V25-10 is 3.2 kilo-ohms, and the capacitance of capacitor I25-2 is 1 micro-
Method, the capacitance of capacitor II25-3 are 2.2 microfarads, and the resistance value of resistance I25-4 is 20 kilo-ohms, and the resistance value of resistance II25-5 is 4,000
Europe, the resistance value of resistance III25-7 are 4 kilo-ohms, and the resistance value of resistance IV25-8 is 5 kilo-ohms.
A kind of liquid absorbent test device includes micro- balance 1, hanger bar 2, electromagnet 3, test chamber 4, blow vent
I5, permanent magnet 6, steel wire 7, displacement sensor 8, induction coil 9, standard sample 10, support level I11, pallet I 12, bracket 13,
Pallet II14, support level II15, connecting tube 16, sample cavity 17, tracheae I18, tracheae II19, blow vent II20, light source 21, camera shooting
Machine 22, divider resistance 23, DC power supply 24, feed circuit 25, computer 26 and displacement platform 27, xy z are three dimensional space coordinate
System, micro- balance 1 connect computer 26, and feed circuit 25 connects computer 26, and test chamber 4 includes the chamber I4-1 connected from top to bottom
With chamber II4-2, micro- 1 position of balance is fixed, and electromagnet 3 is connected to micro- 1 lower section of balance by hanger bar 2, can pass through micro- balance 1
The length for adjusting hanger bar 2 enables to electromagnet 3 mobile in the direction y, and the inner wall of chamber I4-1 is equipped with blow vent from top to bottom
I5, support level I11 and support level II15, the permanent magnet 6, steel wire 7, displacement sensor 8, induction coil 9, standard sample 10,
Pallet I12, bracket 13 and pallet II14 are sequentially located at from top to down in chamber I4-1, and induction coil 9 is located at 8 liang of displacement sensor
Side, for detecting displacement sensor 8 in the displacement in the direction y and being input to computer 26；Standard sample is for the absorption tested
Gas is inertia, and adsorbed gas will not be adsorbed by standard sample, weight m of the standard sample in vacuum environmentrvacAnd volume
VrvacIt is known；What the preset value and induction coil 9 that computer 26 can be displaced according to the permanent magnet 6 of input in the direction y measured
Displacement sensor 8 adjusts the length of hanger bar 2 by micro- balance 1 in the displacement in the direction y, can adjust permanent magnet 6 with this
Position；Relative position is constant between the permanent magnet 6, displacement sensor 8, pallet I12 and pallet II14 and passes through steel wire 7 successively
Connection, the permanent magnet 6, displacement sensor 8, pallet I12 and pallet II14 can be integrally mobile in the direction y, standard sample 10
It is placed on support level I11, standard sample 10 has the through-hole in the vertical direction y, and steel wire 7 contactlessly passes through the through-hole, when forever
When magnet 6 is located at initial position, pallet I12 is located at 2 millimeters of the lower section of standard sample 10, when permanent magnet 6 along y positive direction to moving up
It is dynamic more than 2 millimeters apart from when, standard sample 10 can be lifted up by pallet I12, so that standard sample 10 and support level I11 divide
From pallet II14 is limited in bracket 13, and the side of bracket 13 has flange below, and bracket 13 is located at support level I11 and support
Between the II15 of position, the initial position of bracket 13 is the position that the flange is contacted with support level II15, when permanent magnet 6 is from initial bit
Set along y positive direction move up more than 6 millimeters apart from when, bracket 13 can be lifted up by pallet II14 so that bracket 13 with
Support level II15 separation；The DC power supply 24 has output end and control terminal, and output end outputs current to electromagnet 3, exports
End has output head anode and cathode, and control terminal has control terminal anode and cathode, output head anode, divider resistance 23, electromagnetism
Iron 3 and negative pole of output end are in turn connected to form circuit, and the resistance value of divider resistance 23 is RS=1 ohm；Feed circuit 25 exports mould
Intend voltage to the control terminal of the DC power supply 24, the output electric current of DC power supply 24 can be controlled, it is known that DC power supply 24 is defeated
Outlet is 5 milliseconds to the delay time of the response of the voltage signal of control terminal；The connecting tube 16, sample cavity 17, tracheae I18,
Tracheae II 19 and displacement platform 27 are respectively positioned in chamber II4-2, and the bracket 13, connecting tube 16 and sample cavity 17 are from top to bottom successively
Connection, sample cavity 17 have unidirectional stomata above, and gas can only pass through the unidirectional stomata from bottom to top, in sample cavity 17
Gas can enter connecting tube 16 and chamber I4-1 by the unidirectional stomata, and tracheae II19 is fixed on sample cavity 17 in the following, tracheae
The top and bottom of II 19 penetrate through, and the upper end of tracheae II19 is located at that sample cavity 17 is interior, lower ending opening is in chamber II4-2, tracheae II
19 outer diameter is 2.8 millimeters, internal diameter is 2.4 millimeters, and tracheae I18 is nested in the outside of tracheae II19, and tracheae I18 internal diameter is 4 millis
Rice, the upper end sealing of tracheae I18, upper end of the interior upper surface of tracheae I18 apart from tracheae II19 is 3 millimeters, the lower end of tracheae I18
Interior bottom surface apart from sample cavity 17 is 1 millimeter, and the upper end of tracheae I18 is connected by displacement platform 27 above with the interior of sample cavity 17
It connects, by displacement platform 27 described in wireless remote control, tracheae I18 relative sample chamber 17 is enabled to move in the y-direction, and enable to
The interior bottom face contact of the lower end tracheae I18 and sample cavity 17 simultaneously has air-tightness, and chamber II4-2 has blow vent II20；Sample cavity
There is in 17 sample of sorbent, the light that light source 21 issues can transit chamber II4-2, sample cavity 17 be irradiated in sample of sorbent,
Sample of sorbent, permanent magnet 6, steel wire 7, displacement sensor 8, pallet I12, bracket 13, pallet can be observed by video camera 22
II14, connecting tube 16, sample cavity 17, tracheae I18, tracheae II19 and displacement platform 27 weight be known and floating in gas
Power is ignored；The lower end tracheae I18 be an internal diameter be 4 millimeters, 8 millimeters of outer diameter, a height of 2 millimeters of annulus, the annulus
It is 1 millimeter, in circle that side, which has the truncated cone-shaped opening diameter of micro- stomata 18-1, micro- stomata 18-1 on the inside of annulus of perforation,
Opening diameter on the outside of ring is 0.05 millimeter；Feed circuit 25 includes reference voltage integrated circuit 25-1, capacitor I25-2, capacitor
II25-3, resistance I25-4, resistance II25-5, operational amplifier I25-6, resistance III25-7, resistance IV25-8, operational amplifier
II25-9, resistance V25-10, capacitor III25-11 and operational amplifier III 25-12, reference voltage integrated circuit 25-1 model
For MAX6225, there is input, output end, ground terminal and noise suppressed end, operational amplifier I25-6, operational amplifier
The model of II25-9 and operational amplifier III25-12 are OPA4228, all have normal phase input end, inverting input terminal and output
End, by reference voltage integrated circuit 25-1, capacitor I25-2, capacitor II25-3, resistance I25-4, resistance II25-5, operation amplifier
The reference voltage circuit of device I25-6, resistance III25-7, resistance IV25-8 and operational amplifier II25-9 composition feed circuit 25
Part, the noise suppressed end of reference voltage integrated circuit 25-1, which passes sequentially through capacitor I25-2 and connects operation with resistance II25-5, puts
The normal phase input end of big device I25-6, the output end of reference voltage integrated circuit 25-1 pass through resistance I25-4 connection operational amplifier
The normal phase input end of I25-6, the ground terminal ground connection of reference voltage integrated circuit 25-1, the input of reference voltage integrated circuit 25-1
End keeps constant pressure 15V, and the effect of divider resistance 23 is that the output electric current of DC power supply 24 is converted to voltage VSInput feedback electricity
Road 25, one end ground connection that divider resistance 23 is connected with the output head anode of DC power supply 24,23 other end of divider resistance connection fortune
Calculate the normal phase input end of amplifier III25-12；The inverting input terminal of operational amplifier I25-6 is defeated with operational amplifier I25-6's
Outlet is connected, and the output end of operational amplifier I25-6 passes through the reverse phase of resistance III 25-7 connection operational amplifier II25-9
Input terminal, the inverting input terminal of operational amplifier II25-9 pass through the output of resistance IV25-8 connection operational amplifier II25-9
End, the output end of the positive input end grounding of operational amplifier II25-9, operational amplifier II25-9 are connected by resistance V25-10
Meet the inverting input terminal of operational amplifier III25-12, the output end output voltage V of operational amplifier II25-9R；Operation amplifier
Device III25-12, capacitor III25-11 and resistance V25-10 constitute operation amplifier integrating circuit part, operational amplifier
The inverting input terminal of III25-12 passes through the output end of capacitor III25-11 connection operational amplifier III25-12, operational amplifier
The output end output control voltage V of III25-12CControl terminal to DC power supply 24 is positive, operation amplifier integrating circuit part
Time constant is 5 milliseconds, capacitor identical to the delay time of the response of the voltage signal of control terminal as 24 output end of DC power supply
The capacitance of III25-11 is 2.2 microfarads, and the resistance value of resistance V25-10 is 3.2 kilo-ohms, and the capacitance of capacitor I25-2 is 1 micro-
Method, the capacitance of capacitor II25-3 are 2.2 microfarads, and the resistance value of resistance I25-4 is 20 kilo-ohms, and the resistance value of resistance II25-5 is 4,000
Europe, the resistance value of resistance III25-7 are 4 kilo-ohms, and the resistance value of resistance IV25-8 is 5 kilo-ohms.
Computer 26 changes the principle of the position of permanent magnet 6 by adjusting the length of hanger bar 2:
The preset value that permanent magnet 6 is displaced in the direction y, the preset value of computer 26 and sense are inputted in computer 26
The displacement sensor 8 for answering coil 9 to measure adjusts the length of hanger bar 2 by micro- balance 1 in the displacement in the direction y to change electricity
The position of magnet 3, since the electric current that DC power supply 24 is input to electromagnet 3 is constant, the magnetic field that electromagnet 3 generates is constant, due to
6 change in location of permanent magnet and lead to the weight change connected below, in order to enable permanent magnet 6 is able to maintain suspended state, electricity
Attraction between magnet 3 and permanent magnet 6 also changes, and relative position can also change between electromagnet 3 and permanent magnet 6, meter
Calculation machine 26 need to the preset value and induction coil 9 measure again displacement sensor 8 the direction y displacement, until permanent magnetism
6 position of body reaches the preset value of displacement.
The utility model uses the simple circuit of structure to provide stable electric current for electromagnet, improves adsorbent weighed result
Accuracy, in addition, making it possible to observe and record the shape of single isolated bubbles in liquid absorbent using special air intake structure
Shape, the research of the interaction for gas and liquid absorbent.
Claims (3)
1. a kind of liquid absorbent test device, including micro- balance (1), hanger bar (2), electromagnet (3), test chamber (4), ventilation
Mouthful I (5), permanent magnet (6), steel wire (7), displacement sensor (8), induction coil (9), standard sample (10), support level I (11),
Pallet I (12), bracket (13), pallet II (14), support level II (15), connecting tube (16), sample cavity (17), tracheae I (18), gas
Pipe II (19), blow vent II (20), light source (21), video camera (22), divider resistance (23), DC power supply (24), feed circuit
(25), computer (26) and displacement platform (27), xyz are three-dimensional coordinate system, and micro- balance (1) connects computer (26), feedback
Circuit (25) connects computer (26), and test chamber (4) includes the chamber I (4-1) and chamber II (4-2) connected from top to bottom, micro- balance
(1) position is fixed, and electromagnet (3) is connected to below micro- balance (1) by hanger bar (2), can be adjusted by micro- balance (1) outstanding
The length of hanging rod (2) enables to electromagnet (3) mobile in the direction y, and the inner wall of chamber I (4-1) is equipped with blow vent from top to bottom
I (5), support level I (11) and support level II (15), the permanent magnet (6), steel wire (7), displacement sensor (8), induction coil
(9), standard sample (10), pallet I (12), bracket (13) and pallet II (14) are sequentially located at from top to down in chamber I (4-1),
Induction coil (9) is located at displacement sensor (8) two sides, by detecting displacement sensor (8) based on the displacement in the direction y and being input to
Calculation machine (26)；Standard sample is inertia for the adsorbed gas tested, and adsorbed gas will not be adsorbed by standard sample, standard
Weight m of the sample in vacuum environmentrvacAnd volume VrvacIt is known；Computer (26) can exist according to the permanent magnet (6) of input
The displacement sensor (8) that the preset value and induction coil (9) of the direction y displacement measure passes through micro- balance (1) in the displacement in the direction y
The length of hanger bar (2) is adjusted, can adjust the position of permanent magnet (6) with this；The permanent magnet (6), displacement sensor
(8), relative position is constant between pallet I (12) and pallet II (14) and is sequentially connected by steel wire (7), the permanent magnet (6),
Displacement sensor (8), pallet I (12) and pallet II (14) can be integrally mobile in the direction y, and standard sample (10) is placed in support level
On I (11), standard sample (10) has the through-hole in the vertical direction y, and steel wire (7) contactlessly passes through the through-hole, works as permanent magnet
(6) be located at initial position when, pallet I (12) be located at standard sample (10) lower section 2 millimeters at, when permanent magnet (6) along y positive direction to
Upper movement be more than 2 millimeters apart from when, standard sample (10) can be lifted up by pallet I (12) so that standard sample (10) with
Support level I (11) separation, pallet II (14) are limited in bracket (13), and the side of bracket (13) has flange, bracket below
(13) between support level I (11) and support level II (15), the initial position of bracket (13) is the flange and support level II
(15) contact position, when permanent magnet (6) from initial position along y positive direction move up more than 6 millimeters apart from when, pallet II
(14) bracket (13) can be lifted up, so that bracket (13) is separated with support level II (15)；Permanent magnet (6), steel wire (7),
Displacement sensor (8), pallet I (12), bracket (13), pallet II (14), connecting tube (16), sample cavity (17), tracheae I (18),
The weight of tracheae II (19) and displacement platform (27) is that the known and buoyancy in gas is ignored,
It is characterized in that: the DC power supply (24) has output end and control terminal, output end exports constant current I0To electromagnet
(3), output end has output head anode and cathode, and control terminal has control terminal anode and cathode, output head anode, divider resistance
(23), electromagnet (3) and negative pole of output end are in turn connected to form circuit, and the resistance value of divider resistance (23) is RS=1 ohm；Feedback
Circuit (25) exports the control terminal of analog voltage to the DC power supply (24), can control the output electricity of DC power supply (24)
Stream, it is known that DC power supply (24) output end is 5 milliseconds to the delay time of the response of the voltage signal of control terminal；The connecting tube
(16), sample cavity (17), tracheae I (18), tracheae II (19) and displacement platform (27) are respectively positioned in chamber II (4-2), the bracket
(13), connecting tube (16) and sample cavity (17) are sequentially connected from top to bottom, and sample cavity (17) has unidirectional stomata above, and gas is only
The unidirectional stomata can be passed through from bottom to top, the gas in sample cavity (17) can enter connecting tube by the unidirectional stomata
(16) and chamber I (4-1), tracheae II (19) are fixed on sample cavity (17) in the following, the top and bottom of tracheae II (19) penetrate through, tracheae
The upper end of II (19) is located in sample cavity (17), lower ending opening is in chamber II (4-2), the outer diameter of tracheae II (19) is 2.8 millimeters,
Internal diameter is 2.4 millimeters, and tracheae I (18) is nested in the outside of (19) tracheae II, and tracheae I (18) internal diameter is 4 millimeters, tracheae I (18)
Upper end sealing, upper end of the interior upper surface of tracheae I (18) apart from tracheae II (19) be 3 millimeters, the lower end distance of tracheae I (18)
The interior bottom surface of sample cavity (17) is 1 millimeter, and the upper end of tracheae I (18) and the interior of sample cavity (17) pass through displacement platform (27) above
Connection, by displacement platform described in wireless remote control (27), enables to tracheae I (18) relative sample chamber (17) to move in the y-direction, and
It enables to the interior bottom face contact of (18) lower end tracheae I and sample cavity (17) and there is air-tightness, chamber II (4-2) has ventilation
Mouth II (20)；There is sample of sorbent, the light that light source (21) issues being capable of transit chamber II (4-2), sample cavity in sample cavity (17)
(17) it is irradiated in sample of sorbent, sample of sorbent can be observed by video camera (22).
2. a kind of liquid absorbent test device according to claim 1, it is characterized in that: (18) lower end tracheae I is one
Internal diameter is 4 millimeters, 8 millimeters of outer diameter, a height of 2 millimeters of annulus, and the side of the annulus has the micro- stomata of truncated cone-shaped of perforation
(18-1), opening diameter of the micro- stomata (18-1) on the inside of annulus is 1 millimeter, the opening diameter on the outside of annulus is 0.05
Millimeter.
3. a kind of liquid absorbent test device according to claim 1, it is characterized in that: feed circuit (25) includes benchmark
Voltage integrated circuit (25-1), capacitor I (25-2), capacitor II (25-3), resistance I (25-4), resistance II (25-5), operation amplifier
Device I (25-6), resistance III (25-7), resistance IV (25-8), operational amplifier II (25-9), resistance V (25-10), capacitor III
(25-11) and operational amplifier III (25-12), reference voltage integrated circuit (25-1) model MAX6225, have input terminal,
Output end, ground terminal and noise suppressed end, operational amplifier I (25-6), operational amplifier II (25-9) and operational amplifier III
The model of (25-12) is OPA4228, all has normal phase input end, inverting input terminal and output end, by the integrated electricity of reference voltage
Road (25-1), capacitor I (25-2), capacitor II (25-3), resistance I (25-4), resistance II (25-5), operational amplifier I (25-6),
The reference voltage circuit of resistance III (25-7), resistance IV (25-8) and operational amplifier II (25-9) composition feed circuit (25)
Part, the noise suppressed end of reference voltage integrated circuit (25-1) pass sequentially through capacitor I (25-2) and resistance II (25-5) connection
The output end of the normal phase input end of operational amplifier I (25-6), reference voltage integrated circuit (25-1) is connected by resistance I (25-4)
Connect the normal phase input end of operational amplifier I (25-6), the ground terminal ground connection of reference voltage integrated circuit (25-1), reference voltage collection
Constant pressure 15V is kept at the input terminal of circuit (25-1), the effect of divider resistance (23) is by the output electric current of DC power supply (24)
Be converted to voltage VSInput feedback circuit (25), one end that divider resistance (23) is connected with the output head anode of DC power supply (24)
Ground connection, divider resistance (23) other end connect the normal phase input end of operational amplifier III (25-12)；Operational amplifier I (25-6)
Inverting input terminal be connected with the output end of operational amplifier I (25-6), the output end of operational amplifier I (25-6) passes through electricity
Hinder the inverting input terminal of III (25-7) connection operational amplifier II (25-9), the inverting input terminal of operational amplifier II (25-9)
Pass through the output end of resistance IV (25-8) connection operational amplifier II (25-9), the normal phase input end of operational amplifier II (25-9)
Ground connection, the reverse phase that the output end of operational amplifier II (25-9) passes through resistance V (25-10) connection operational amplifier III (25-12)
Input terminal, the output end output voltage V of operational amplifier II (25-9)R；Operational amplifier III (25-12), capacitor III (25-
11) and resistance V (25-10) constitutes operation amplifier integrating circuit part, the inverting input terminal of operational amplifier III (25-12)
Pass through the output end of capacitor III (25-11) connection operational amplifier III (25-12), the output of operational amplifier III (25-12)
End output control voltage VCTo the control terminal anode of DC power supply (24), the time constant of operation amplifier integrating circuit part is 5
Millisecond, capacitor III (25- identical to the delay time of the response of the voltage signal of control terminal as DC power supply (24) output end
11) capacitance is 2.2 microfarads, and the resistance value of resistance V (25-10) is 3.2 kilo-ohms, and the capacitance of capacitor I (25-2) is 1 microfarad,
The capacitance of capacitor II (25-3) is 2.2 microfarads, and the resistance value of resistance I (25-4) is 20 kilo-ohms, and the resistance value of resistance II (25-5) is 4
Kilo-ohm, the resistance value of resistance III (25-7) is 4 kilo-ohms, and the resistance value of resistance IV (25-8) is 5 kilo-ohms.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821587718.5U CN209387447U (en) | 2018-09-16 | 2018-09-16 | A kind of liquid absorbent test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821587718.5U CN209387447U (en) | 2018-09-16 | 2018-09-16 | A kind of liquid absorbent test device |
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| CN209387447U true CN209387447U (en) | 2019-09-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164003A (en) * | 2018-09-16 | 2019-01-08 | 金华职业技术学院 | A kind of liquid absorbent test device |
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2018
- 2018-09-16 CN CN201821587718.5U patent/CN209387447U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164003A (en) * | 2018-09-16 | 2019-01-08 | 金华职业技术学院 | A kind of liquid absorbent test device |
| CN109164003B (en) * | 2018-09-16 | 2024-01-30 | 金华职业技术学院 | Liquid adsorbent testing arrangement |
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