CN102749123A - Radioactive waste resin interface measuring device based on lifting device and application method thereof - Google Patents
Radioactive waste resin interface measuring device based on lifting device and application method thereof Download PDFInfo
- Publication number
- CN102749123A CN102749123A CN2012102590521A CN201210259052A CN102749123A CN 102749123 A CN102749123 A CN 102749123A CN 2012102590521 A CN2012102590521 A CN 2012102590521A CN 201210259052 A CN201210259052 A CN 201210259052A CN 102749123 A CN102749123 A CN 102749123A
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- density sensor
- resin
- radioactive spent
- spent resin
- lifting gear
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- 239000011347 resin Substances 0.000 title claims abstract description 115
- 229920005989 resin Polymers 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000002901 radioactive waste Substances 0.000 title abstract 3
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 230000002285 radioactive effect Effects 0.000 claims description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 241001149900 Fusconaia subrotunda Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Measurement Of Radiation (AREA)
Abstract
The invention discloses a radioactive waste resin interface measuring device based on a lifting device and an application method thereof. The measuring device comprises a resin storage tank, a density sensor arranged in the resin storage tank and a material feeding pipe arranged on the resin storage tank and further comprises a measuring instrument vertically stretching into the resin storage tank and in vertical rotating connection with the density sensor, a platform located above the measuring instrument and the lifting device. The measuring device and the method overcome the shortcoming of radioactive waste resin interface height error overbalance caused by the fact that the installation position of a measuring rod cannot be aligned right at a material feeding port, enable the position of the measuring instrument and the density sensor to have no relation with the position and the state of the material feeding pipe and are accurate in measurement.
Description
Technical field
The present invention relates to a kind of measurement mechanism and application process thereof, specifically relate to a kind of radioactive spent resin interface-measuring device and application process thereof based on lifting gear.
Background technology
Radioactive spent resin is a very long solid core waste material of a kind of half life period, and density is 1.07～1.12 g/cm
3, very little with the density difference of water, individual mean diameter is 0.7mm; Long term storage is treated further to carry out cured after the decay, because of on technological requirement in water; No matter be to store or handle, all must make accurate measurement, to guarantee safety to the amount of resin and the water yield.
Measurement mechanism in the present stage open source literature is through density sensor is passed sounding rod; Density sensor is floated on the radioactive spent resin interface; Two different interfaces are discerned; With position transducer the position display of density sensor is come out then, realize measurement resin boundary surface.
And in the present stage disclosed document; Sounding rod must be corresponding with charging aperture in this measurement mechanism, and distance≤300mm is therefore strict to feed pipe and the installation site of sounding rod in jar; If the position of sounding rod in tank body can't meet the demands; Cause the density sensor on the sounding rod under various operating modes, can not borrow feed pressure and resin synchronization lifting easily, can't accurately measure resin boundary surface, error value of overruning that it is measured; And the structure of resin hold-up tank is not quite similar, and must install and measure bar and density sensor respectively for different resin hold-up tanks, guarantees the measuring accuracy stable and consistent.Cause like this trouble is installed, and cause measuring error easily, it can not be met the demands.
Summary of the invention
The objective of the invention is to overcome installation site and the charging aperture of sounding rod can't be directly to the time cause the radioactive spent resin interfacial level measured to exist error to overflow defective, provide a kind of irrelevant with feed state, measure accurately and to the radioactive spent resin interface-measuring device and the application process thereof based on lifting gear of sounding rod installation site no requirement (NR).
The technical scheme that the present invention adopts is following:
Radioactive spent resin interface-measuring device based on lifting gear; Comprise the resin hold-up tank; Be positioned at the density sensor of resin hold-up tank, be arranged at the feed pipe on the resin hold-up tank, also comprise the measuring instrument that vertically gos deep into the resin hold-up tank and be slidingly connected with density sensor; The center pass measuring instrument and the supporting body that is slidingly connected with measuring instrument, with the lifting gear that the supporting body two ends are connected, wherein said supporting body is positioned at density sensor below and density greater than density sensor.
In order to make density sensor float over the radioactive spent resin interface, the density of said density sensor is 1.0 ~ 1.12g/cm
3
In order accurately to measure the radioactive spent resin interfacial level, said measuring instrument is a magnetostrictive displacement sensor.
As a kind of preferred, said supporting body is a weight.
Further; Also comprise the platform that is fixed with lifting gear and is positioned at the measuring instrument top; Wherein said lifting gear comprises first motor and the gear frame that all is arranged on the platform, through rotating shaft and the rope sheave that first motor links to each other, and two wireropes that are wound on the rope sheave and are rotationally connected with gear frame.
Further again, said gear frame is even number and has two at least that the below and the mean allocation ground that are positioned at rope sheave are rotationally connected with two wireropes.
Based on the radioactive spent resin interface-measuring device of lifting gear, the present invention also provides its application process, may further comprise the steps:
(a) pass through feed pipe injects radioactive spent resin and water in the resin hold-up tank potpourri, to rising, this moment, upwards lifted by supporting body by density sensor through lifting gear for supporting body simultaneously;
(b) supporting body and density sensor stop after rising;
(c) stop to inject the potpourri of radioactive spent resin and water, because spent resin density is greater than water, so radioactive spent resin will sink at the bottom of the resin hold-up tank, and it is two-layer to form water and radioactive spent resin;
(d) lifting gear control supporting body falls with the speed more than the average 1m/s; Density sensor receives gravity and falls simultaneously; And separate with supporting body; Because the density of density sensor is greater than water and less than radioactive spent resin, so density sensor drops to the radioactive spent resin interface and just stops;
(e) measuring instrument goes out the radioactive spent resin interfacial level through the position measurement of density sensor.
Compared with prior art, the present invention has following beneficial effect:
(1) adopt density sensor among the present invention, this density sensor is applicable to the various environment in the resin hold-up tank, not only convenient measurement and can not receive the influence of the environmental change in the resin hold-up tank;
(2) the present invention replaces sounding rod and position transducer through using measuring instrument; Sounding rod does not have sensing function; And measuring instrument is magnetostrictive displacement sensor; Measure the radioactive spent resin interfacial level through interacting, reduced the module in the device when having improved efficient with density sensor; And because this magnetostrictive displacement sensor is originally as high-precision sensor; Long service life when cost performance is high; And because himself environmental suitability is strong, also can operate as normal under rugged surroundings and be widely used in every field, its reliability is very high;
(3) lifting gear of the present invention is mainly used in the up-down supporting body; Realized the controllability of density sensor is promoted and free-falling; Make it irrelevant with the state that injects water and radioactive spent resin potpourri through feed pipe to the measurement of radioactive spent resin interfacial level; Thereby avoided external interference fully, realized the high-acruracy survey of spent resin interfacial level; Simultaneously, the installation site of feed pipe and measuring instrument need not needn't be installed respectively measuring instrument because of the difference of hold-up tank structure directly, has simplified installation procedure greatly, has reduced installation difficulty;
(4) lifting gear among the present invention comprises motor, rope sheave, gear frame, wirerope; Motor can make the rising and the decline of supporting body through the rotation of control rope sheave like this; Because supporting body can be a weight, the material of weight is stainless steel or other metals, under the control of motor, can ignore the influence that water and radioactive spent resin fall to weight; Make its falling speed can be accurate to occurrence; Thereby guarantee that weight separates with density sensor, density sensor is just stopped dropping on the radioactive spent resin interface, but the easy realization degree simultaneously of operation height;
(5) gear frame is even number and has two at least among the present invention; Gear frame supports moving up and down of two wireropes drive weights through being rotationally connected with wirerope of mean allocation like this; Because two wireropes lie in the two ends of weight respectively; When rope sheave rotated the up-down of control weight, two wireropes elongated simultaneously or shrink and avoided the weight crank that density sensor can not balance be floated on the radioactive spent resin interface, thereby measuring instrument can not accurately measure the defective at radioactive spent resin interface.
Description of drawings
Fig. 1 is the structural representation of the present invention-embodiment 1.
Fig. 2 is the structural representation of the present invention-embodiment 2.
Fig. 3 is the structural representation of the present invention-embodiment 3.
Fig. 4 is the process flow diagram of the present invention-embodiment 1.
Wherein Reference numeral corresponding components name is called:
1-water, 2-radioactive spent resin, 3-supporting body, 4-density sensor, 5-measuring instrument; 6-feed pipe, 7-wirerope, 8-platform, 9-the first motor, 10-rope sheave; 11-gear frame, 12-resin hold-up tank, 13-support bar, 14-balance plate, 15-telescopic shaft; 16-the second motor, 17-sliding pin, 18-electromagnet, 19-coil, 20-spring.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further, embodiment of the present invention includes but not limited to the following example.
In the radioactive spent resin interface-measuring device based on lifting gear as shown in Figure 1; Said lifting gear comprises motor and the gear frame that all is arranged on the platform; Through the rope sheave that rotating shaft links to each other with motor, two wireropes that are wound on the rope sheave and are rotationally connected with gear frame.The application process of wherein said measurement mechanism, mainly accomplish through following steps:
(1) resin hold-up tank as shown in Figure 1, wherein movable successively from top to bottom to insert density be 7.9g/cm with measuring instrument 5
3 Supporting body 3 and density sensor 4, and pass the center of supporting body and density sensor, then measuring instrument is vertically goed deep into the resin hold-up tank; Wherein this supporting body is for being scribbled the weight that the rectangle iron block of anti-corrosion material is made by appearance, and this measuring instrument is a magnetostrictive displacement sensor;
(2) two wireropes that length is identical are fastened at the two ends of weight upper surface respectively; And each bar wirerope is rotationally connected with two gear frames that are fixed on the platform respectively; And be wound in the rope sheave of gear frame upper end; Be connected with first motor owing to rope sheave passes through rotation axis, thereby so rope sheave can wirerope extended through the control rotation of first motor or the receipts weak point promotes weight or makes the weight whereabouts.Wherein wirerope, gear frame, rope sheave and first motor are formed lifting gear;
(3) through the potpourri of feed pipe to resin hold-up tank injection radioactive spent resin 1 and water 2, start first motor simultaneously, drive rope sheave through rotating shaft and rotate, shrink wirerope, weight is upwards carried, weight is upwards lifted density sensor at this moment;
(4) weight stops the position that density sensor is lifted near the measuring instrument top; Continue to inject the potpourri of radioactive spent resin and water;
(5) owing to the density of radioactive spent resin density greater than water; After waiting to stop to inject the potpourri of radioactive spent resin and water; According to the time that injection rate IR decision radioactive spent resin sinks under water, treat that radioactive spent resin all sinks under water and stable after, first motor is controlled the rotation of rope sheave once more; Discharge wirerope, weight is fallen with the speed of 2m/s;
(6) learn through test; Because gravity and two common cause of buoyancy of water, the falling speed of density sensor will be less than the falling speed of weight, so density sensor falls slow; And when dropping to the radioactive spent resin interface, stop, floating on the radioactive spent resin interface;
(7) treat that density sensor stops to fall behind down, measuring instrument goes out the height at radioactive spent resin interface through the position measurement of density sensor.
Be with the difference of embodiment 1; Electromagnet 18 at the bottom of lifting gear as shown in Figure 2 comprises the spring 20 that lies in supporting body upper surface two ends, is arranged under the supporting body and is fixed on the resin hold-up tank and the coil 19 on the electromagnet, therefore realize the measurement of radioactive spent resin interfacial level may further comprise the steps:
(1) resin hold-up tank as shown in Figure 2, wherein movable successively from top to bottom to insert density be 7.9g/cm with measuring instrument 5
3 Supporting body 3 and density sensor 4, and pass the center of supporting body and density sensor, then measuring instrument is vertically goed deep into the resin hold-up tank; Wherein this supporting body is made said measuring instrument magnetostrictive displacement sensor for the rectangle sliding pin 17 that is scribbled anti-corrosion material by appearance;
(2) two springs that length is identical are fastened at the two ends of sliding pin upper surface respectively, and each root spring is connected with the top of resin hold-up tank respectively, and when spring not being carried out the application of force, supporting body only receives gravity effect; Bottom under the supporting body in the resin hold-up tank also is fixed with the electromagnet that matches with sliding pin; Below the electromagnet, the external stability of resin hold-up tank has coil, injects the potpourri of radioactive spent resin and water to the resin hold-up tank through feed pipe.When not giving coil electricity, owing to do not produce magnetic field around the electromagnet, therefore spring rises to the position near resin hold-up tank top with sliding pin simultaneously, and supporting body is raised density sensor;
(3) sliding pin stops the position that density sensor is lifted near the measuring instrument top, continues to inject the potpourri of radioactive spent resin and water this moment;
(4) because radioactive spent resin density greater than the density of water, after waiting to stop to inject the potpourri of radioactive spent resin and water, determines the time that radioactive spent resin sinks under water according to injection rate IR; Treat that radioactive spent resin all sinks under water and stable after, give coil power supply, electromagnet produces magnetic field through coil current, this moment electromagnet will attract sliding pin along magnetostrictive displacement sensor downwards with the speed slip of 5m/s;
(5) learn through test; Because gravity and two common cause of buoyancy of water, the falling speed of density sensor will be less than the falling speed of sliding pin, so density sensor falls slow; And when dropping to the radioactive spent resin interface, stop, floating on the radioactive spent resin interface;
(6) treat that density sensor stops to fall behind down, measuring instrument goes out the height at radioactive spent resin interface through the position measurement of density sensor.
Be that with the difference of embodiment 1 said lifting gear is located at resin hold-up tank below, therefore realize the measurement of radioactive spent resin interfacial level may further comprise the steps:
(1) resin hold-up tank as shown in Figure 3, wherein movable successively from top to bottom to insert density be 7.9g/cm with measuring instrument 5
3 Supporting body 3 and density sensor 4, and pass the center of supporting body and density sensor, then measuring instrument is vertically goed deep into the resin hold-up tank; Wherein this supporting body is the back up pad of being made by stainless steel,, said measuring instrument magnetostrictive displacement sensor;
(2) two ends of back up pad lower surface are fixed with a support bar respectively; And two support bar length are identical; The other end is fixed in the two ends of balance plate; The lower surface of balance plate is connected with telescopic shaft, and this telescopic shaft other end links to each other with second motor, and wherein said two support bars, balance plate, telescopic shaft and second motor are formed lifting gear;
(3) through the potpourri of feed pipe to resin hold-up tank injection radioactive spent resin and water; Start second motor simultaneously; Drive telescopic shaft and make its elongation, upwards slide along magnetostrictive displacement sensor thereby drag back up pad, this moment, back up pad was upwards lifted density sensor;
(4) back up pad stops the position that sensor is lifted near magnetostrictive displacement measuring instrument top; Continue to inject the potpourri of radioactive spent resin and water this moment;
(5) owing to the density of radioactive spent resin density greater than water; After waiting to stop to inject the potpourri of radioactive spent resin and water; Determine the time that radioactive spent resin sinks under water according to injection rate IR; Treat that radioactive spent resin all sinks under water and stable after, second motor is controlled telescopic shaft once more and is shortened, and back up pad is fallen with the speed of 4m/s;
(6) learn through test; Because gravity and two common cause of buoyancy of water, the falling speed of density sensor will be less than the falling speed of weight, so density sensor falls slow; And when dropping to the radioactive spent resin interface, stop, floating on the radioactive spent resin interface;
(7) treat that density sensor stops to fall behind down, measuring instrument goes out the height at radioactive spent resin interface through the position measurement of density sensor.
According to the foregoing description, just can realize the present invention well.
Claims (7)
1. based on the radioactive spent resin interface-measuring device of lifting gear; Comprise resin hold-up tank (12); Be positioned at the density sensor (4) of resin hold-up tank (12); Be arranged at the feed pipe (6) on the resin hold-up tank (12); It is characterized in that: also comprise the measuring instrument (5) that vertically gos deep into resin hold-up tank (12) and be slidingly connected with density sensor (4), the lifting gear that the center is passed measuring instrument (5) and the supporting body (3) that is slidingly connected with measuring instrument (5), is connected with supporting body (3) two ends, wherein said supporting body (3) are positioned at density sensor (4) below and density greater than density sensor (4).
2. the radioactive spent resin interface-measuring device based on lifting gear according to claim 1 is characterized in that the density of said density sensor (4) is 1.0 ~ 1.12g/cm
3
3. the radioactive spent resin interface-measuring device based on lifting gear according to claim 2 is characterized in that said measuring instrument (5) is a magnetostrictive displacement sensor.
4. the radioactive spent resin interface-measuring device based on lifting gear according to claim 3 is characterized in that said supporting body (3) is a weight.
5. the radioactive spent resin interface-measuring device based on lifting gear according to claim 1; It is characterized in that; Also comprise the platform that is fixed with lifting gear and is positioned at measuring instrument (5) top; Wherein said lifting gear comprises first motor (9) and the gear frame (11) that all is arranged on the platform (8), through the rope sheave (10) that rotating shaft links to each other with first motor (9), and two wireropes (7) that are wound in that rope sheave (10) is gone up and are rotationally connected with gear frame (11).
6. the radioactive spent resin interface-measuring device based on lifting gear according to claim 5; It is characterized in that; Said gear frame (11) is for even number and have two at least, and the below and the mean allocation ground that are positioned at rope sheave (10) are rotationally connected with two wireropes (7).
7. based on the application process of the radioactive spent resin interface-measuring device of lifting gear, it is characterized in that, may further comprise the steps:
(a) pass through feed pipe injects radioactive spent resin and water in the resin hold-up tank potpourri, to rising, this moment, upwards lifted by supporting body by density sensor through lifting gear for supporting body simultaneously;
(b) supporting body and density sensor stop after rising;
(c) stop to inject the potpourri of radioactive spent resin and water, because spent resin density is greater than water, so radioactive spent resin will sink at the bottom of the resin hold-up tank, and it is two-layer to form water and radioactive spent resin;
(d) lifting gear control supporting body falls with the speed more than the average 1m/s; Density sensor receives gravity and falls simultaneously; And separate with supporting body; Because the density of density sensor is greater than water and less than radioactive spent resin, so density sensor drops to the radioactive spent resin interface and just stops;
(e) measuring instrument goes out the radioactive spent resin interfacial level through the position measurement of density sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210259052.1A CN102749123B (en) | 2012-07-25 | 2012-07-25 | Radioactive waste resin interface measuring device based on lifting device and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210259052.1A CN102749123B (en) | 2012-07-25 | 2012-07-25 | Radioactive waste resin interface measuring device based on lifting device and application method thereof |
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| Publication Number | Publication Date |
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| CN102749123A true CN102749123A (en) | 2012-10-24 |
| CN102749123B CN102749123B (en) | 2014-03-05 |
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| CN201210259052.1A Expired - Fee Related CN102749123B (en) | 2012-07-25 | 2012-07-25 | Radioactive waste resin interface measuring device based on lifting device and application method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089683A (en) * | 2014-07-03 | 2014-10-08 | 中国核动力研究设计院 | Double-interface-level measuring device for measuring liquid level and material level |
| CN105628106A (en) * | 2016-04-11 | 2016-06-01 | 成都中核鑫星应用技术研究所 | Measurement device |
| CN107796476A (en) * | 2017-11-13 | 2018-03-13 | 山东科技大学 | It is a kind of to be used for the device and method of material position and measurement of concetration in concentrator |
| CN110355929A (en) * | 2019-08-26 | 2019-10-22 | 江苏良腾机械有限公司 | A kind of pentamethylene low-pressure blowing machine |
| CN110726457A (en) * | 2019-10-24 | 2020-01-24 | 中国核动力研究设计院 | Integrated waste resin liquid level interface measuring system |
| CN114279531A (en) * | 2021-12-28 | 2022-04-05 | 四川航天神坤科技有限公司 | Radioactive waste resin interface measuring device based on magnetostrictive liquid level meter |
| CN114720044A (en) * | 2021-05-17 | 2022-07-08 | 中国核动力研究设计院 | Static pressure measuring device, resin particle layered liquid level measuring device and method |
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| CN201561909U (en) * | 2009-09-07 | 2010-08-25 | 青岛澳科仪器有限责任公司 | Pressure-differential type density sensor and density measurement device comprising the same |
| EP2312283A1 (en) * | 2009-10-16 | 2011-04-20 | Franklin Fueling Systems, Inc. | Method and apparatus for detection of phase separation in storage tanks |
| CN102589650A (en) * | 2011-12-23 | 2012-07-18 | 太原理工大学 | Integrated measuring apparatus of liquid level and material level |
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| CN2911661Y (en) * | 2006-05-31 | 2007-06-13 | 孙益晖 | Interface measurer for radioactive wasted resin |
| CN101251462A (en) * | 2008-04-02 | 2008-08-27 | 罗放明 | Device and method for measuring liquid concentration in movable and static state |
| CN201561909U (en) * | 2009-09-07 | 2010-08-25 | 青岛澳科仪器有限责任公司 | Pressure-differential type density sensor and density measurement device comprising the same |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089683A (en) * | 2014-07-03 | 2014-10-08 | 中国核动力研究设计院 | Double-interface-level measuring device for measuring liquid level and material level |
| CN104089683B (en) * | 2014-07-03 | 2017-07-11 | 中国核动力研究设计院 | A kind of double boundary's level measuring arrangements for measuring liquid level and material position |
| CN105628106A (en) * | 2016-04-11 | 2016-06-01 | 成都中核鑫星应用技术研究所 | Measurement device |
| CN105628106B (en) * | 2016-04-11 | 2018-02-09 | 成都中核鑫星应用技术研究所 | Integrated density liquid level temperature measuring equipment |
| CN107796476A (en) * | 2017-11-13 | 2018-03-13 | 山东科技大学 | It is a kind of to be used for the device and method of material position and measurement of concetration in concentrator |
| CN110355929A (en) * | 2019-08-26 | 2019-10-22 | 江苏良腾机械有限公司 | A kind of pentamethylene low-pressure blowing machine |
| CN110726457A (en) * | 2019-10-24 | 2020-01-24 | 中国核动力研究设计院 | Integrated waste resin liquid level interface measuring system |
| CN110726457B (en) * | 2019-10-24 | 2021-10-01 | 中国核动力研究设计院 | Integrated waste resin liquid level interface measuring system |
| CN114720044A (en) * | 2021-05-17 | 2022-07-08 | 中国核动力研究设计院 | Static pressure measuring device, resin particle layered liquid level measuring device and method |
| CN114279531A (en) * | 2021-12-28 | 2022-04-05 | 四川航天神坤科技有限公司 | Radioactive waste resin interface measuring device based on magnetostrictive liquid level meter |
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|---|---|
| CN102749123B (en) | 2014-03-05 |
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