CN202693502U - Continuous following nuclear level monitoring device - Google Patents
Continuous following nuclear level monitoring device Download PDFInfo
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- CN202693502U CN202693502U CN 201220401530 CN201220401530U CN202693502U CN 202693502 U CN202693502 U CN 202693502U CN 201220401530 CN201220401530 CN 201220401530 CN 201220401530 U CN201220401530 U CN 201220401530U CN 202693502 U CN202693502 U CN 202693502U
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- monitoring device
- radioactive source
- signal
- continuous
- continuous tracking
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- 230000002285 radioactive Effects 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 230000003028 elevating Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000005251 gamma ray Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000002360 explosive Substances 0.000 abstract description 3
- 230000002588 toxic Effects 0.000 abstract 1
- 231100000331 toxic Toxicity 0.000 abstract 1
- 101710033747 S6 Proteins 0.000 description 3
- 101710026330 Segment-11 Proteins 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000109 continuous material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005658 nuclear physics Effects 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses a continuous following nuclear level monitoring device and belongs to the technical field of radiant continuous level detection. The continuous following nuclear level monitoring device solves the problem that an existing continuous following nuclear level monitoring device is low in measuring efficiency, high in cost, and poor in measuring accuracy in a measuring process. A lifting mechanism of the continuous following nuclear level monitoring device is used for driving a radiant source and two detectors to rise or fall simultaneously. The two detectors are arranged along vertical direction, and a drive unit of the lifting mechanism is used for driving an upgrading mechanism to run. A signal processing unit receives signals sent from a double-tube detector, and processes the signals and further generates a drive signal of the drive unit of the upgrading mechanism, and the signal processing unit transmits the drive signal to the drive unit of the upgrading mechanism. Two radiant receiving tubes of the double-tube detector are arranged along the vertical direction. The continuous following nuclear level monitoring device is particularly suitable for the continuous level detection in severe environments, and is particularly suitable for continuous level measurement in severe environments such as toxic, inflammable, explosive, high-temperature and high-pressure environments.
Description
Technical field
The utility model belongs to radioactivity continuous material level detection technique field.
Background technology
Thing position detection technique has important effect in the industrial processes of reality, by to the accurately measuring of thing position, can guarantee the optimization control of production run.Thing position product category in producing family's practice is more at present, can be divided into contact type measurement and non-contact measurement by the measurement form.Nuclear thing position monitoring device need not to change the intrinsic shape of the tank body of installing 20 because nondestructive measurement is carried out in its noncontact, is adapted to especially the thing position monitoring under the rugged surroundings, has reliable operation, measure accurately, advantage easy to maintenance has in real work very widely and uses.
Utilizing at present the continuous kernel thing position measuring instrument of radiation absorption principle both at home and abroad, generally is to adopt three kinds of forms: the structure of line source and line detector; The structure of line source and point probe; The structure of point source and line detector.1., price comparison is expensive but three fatal shortcomings are arranged in application:; 2., poor anti jamming capability, reliability is low; 3., because the nuclear instrument needs manufacturer's Installation and Debugging, give install, debugging and in the future maintenance make troubles, and also increased expense.
This project succeed in developing alternative external product, and the price of decrease instrument makes things convenient for demestic user's operation and maintenance.
The utility model content
The utility model has designed a kind of Continuous Tracking nuclear thing position monitoring device in order to solve the problem that measurement efficient is low, cost is high, measurement accuracy is poor that exists in the measuring instrument measuring process of existing continuous kernel thing position.
Continuous Tracking nuclear thing described in the utility model position monitoring device comprises radioactive source, two detectors, elevating mechanism, elevating mechanism driver element and signal processing unit, described elevating mechanism is used for driving radioactive source and two detectors rise or decline synchronously, described two detectors are vertically arranged, upgrading mechanism driver element is used for the driver upgrade mechanism kinematic, signal processing unit receives the signal that two-tube detector sends, and described signal processed and then generates the driving signal of upgrading mechanism driver element, described signal processing unit should drive signal and send to the mechanism's driver element of upgrading.
Two ray receiving tubes of above-mentioned two-tube detector are vertically arranged.
Principle of work of the present utility model is: radioactive source sends ray, after passing tested tank body and interior media, the two-tube detector that is placed on the tank body opposite side receives, after in ray is injected tank body, when running into the medium in the tank, described ray is by Absorption of Medium, and two-tube detector does not receive ray, this shows that the pipe position that does not receive ray signal in the two-tube detector is lower than thing position height; And after ray is injected tank interior, do not run into the medium in the tank, and described ray is received by the two-tube detector of opposite side, and this shows that the pipe position that receives ray signal in the two-tube detector is higher than thing position height; Pipe above being positioned in two pipes of described two-tube one-sided device receive ray signal and below being positioned at do not receive ray signal the time, show that the thing position is just in the centre position of two pipes.
According to above-mentioned principle, the distance between two pipes in the two-tube detector can rationally be set, and then set accuracy of detection.
The logic of Continuous Tracking nuclear thing described in the utility model position monitoring device judges that principle is:
Gamma-rays passes tested container and medium behind collimation, received by two-tube scintillation detector behind Absorption of Medium.The counting rate of the received signal of detector is relevant with the position of medium in the tested container.After the media location in the detector changes, can obtain the two-tube measured data that obtain in the detector, its logical relation has three kinds of possibilities:
1, two photomultipliers all receive ray;
2, upper photomultiplier receives ray, the lower ray that do not receive;
3, photomultiplier does not all receive ray up and down.
In real work, need to measure simultaneously same a branch of gamma-ray having or not (or size) of passing container, if the transmitted intensity received when detector is little, when another transmitted intensity that receives was large, then storing two positions between the detector was the charge level height.If the transmitted intensity that two detectors receive is identical, illustrate that then this place is not the material level interface, microprocessor control transmission gear for electric motor, just can find charge level according to the output situation of two detectors, and follow the tracks of the purpose that has reached the continuous coverage material level.
Advantage of the present utility model:
1. adopt two detectors to carry out the design of collection signal, judge by signal processor, the operation of control motor, metering system with fixed point is realized thing position continuous coverage, the size of error depends on the structure of detector in measuring process, relative error makes zero, and large range measuring is had higher precision, has improved Systems balanth and measuring accuracy.
3. utilize gamma-rays noncontact (penetrating) metering system, thereby be specially adapted to the level gauging in the container under toxicity, inflammable and explosive, high temperature, the high pressure rugged surroundings.
4. utilize the nuclear physics measuring principle to design, adopt ray collimation mode to measure, reduce the scattering error impact; Adopt the contactless continuous measuring mode, under measuring accuracy was not subjected to situation that changes in environmental conditions affects, reliable and stable, maintenance was little;
5, with point source as emitter, the form that two-tube detector receives, motor is with the measuring method of motion tracking, the reaction time and the material level that improve system change the speed of following the tracks of.
The utility model is for adapting to nuclear thing position measuring instrument development trend, the top level gauging that is applicable to have larger flow velocity liquid place of design.This device utilizes the nuclear physics measuring principle to be the basis, adopt point source as the signals collecting mode of emissive source, two-tube scintillation detector, utilizing microprocessor to carry out data processes and logical operation, the measurement form of the servo-actuated real-time follow-up of control motor, realize the requirement of continuous coverage large range measuring being had higher precision with the measurement form of fixed point thing position.
The utility model is particularly useful for detecting as the continuous material level under the rugged surroundings, and the continuous material level that is specially adapted under toxicity, inflammable and explosive, high temperature, the high pressure rugged surroundings is measured.
Description of drawings
Fig. 1 is that Continuous Tracking nuclear thing described in the utility model position monitoring device uses view.
Fig. 2 is vertical view of the present utility model.
Fig. 3 is side view of the present utility model.
Embodiment
Embodiment one, the described Continuous Tracking nuclear of present embodiment thing position monitoring device comprises radioactive source 18, two detectors 17, elevating mechanism, elevating mechanism driver element and signal processing unit, described elevating mechanism is used for driving radioactive source 18 and two detectors 17 rise or decline synchronously, described two detectors 17 are vertically arranged, upgrading mechanism driver element is used for the driver upgrade mechanism kinematic, signal processing unit receives the signal that two-tube detector 17 sends, and described signal processed and then generates the driving signal of upgrading mechanism driver element, described signal processing unit should drive signal and send to the mechanism's driver element of upgrading.
The described signal processing unit of present embodiment adopts chip microcontroller.
When practical application, radioactive source 18 and two-tube detector 17 are symmetricly set on the both sides of tested tank body 20, and the line that makes the two is horizontal line, the radiation signal of radioactive source 18 emissions is incident to tested tank body 20, two-tube detector 17 receives this radiation signal at the opposite side of tested tank body 20, signal processing unit is judged the relation of radioactive source 18 and two-tube detector 17 lines and tank body 20 inner thing positions according to the signal that receives, and according to the described output drive signal that concerns, control upgrading mechanism drives radioactive source 18 and two-tube detector 17 rises or decline, knows that described line and tested tank body 20 inner thing positions coincide.Described line refers to the line of the position in the middle of two pipes of position that radioactive source 18 transmits and two-tube detector 17.
Embodiment two, present embodiment are the further restrictions to embodiment one described Continuous Tracking nuclear thing position monitoring device, the described Continuous Tracking nuclear of present embodiment thing position monitoring device also comprises position-limit mechanism, described position-limit mechanism is used for extreme higher position and the extreme lower position of restriction radioactive source, and described position-limit mechanism output limit signal is to signal processing unit.
Embodiment three, shown in Fig. 2 and 3, present embodiment is described.Present embodiment is the further restriction to embodiment one described Continuous Tracking nuclear thing position monitoring device, elevating mechanism described in the present embodiment adopts a pair of steel wire around wheel 2, transmission shaft 10, speed reduction unit 14 and gear train are realized, described upgrading mechanism driver element adopts drive motor 15 to realize, the output shaft of described drive motor 15 is by speed reduction unit 14, gear train drives transmission shaft 10 and rotates, a pair of steel wire is separately fixed at the two ends of transmission shaft 10 around wheel 2, the end of steel wire steel wire 1 of winding on wheel 2 is radioactive source 18 fixedly, and the end of the steel wire 1 that another steel wire twines on wheel 2 is fixed with two detectors 17.
The described technical scheme of present embodiment is when practical application, if the weight of detector 17 is too little, and when causing making steel wire to stretch, sash weight 17 of following increase of detector 17.Perhaps the end with steel wire is fixed on the peak of tank body thing position, then articulates a sash weight 17 between the terminal and fixing detector 17 on the steel wire, and referring to shown in Figure 3, described sash weight 17 is used for stretching steel wire 1 makes it linearly.
Embodiment four, shown in Fig. 2 and 3, present embodiment is described.Present embodiment is the further restriction to embodiment three described Continuous Tracking nuclear thing position monitoring devices, the centre of the transmission shaft described in the present embodiment is provided with thread segment 9, be provided with nut 8 on the described thread segment 9, be arranged in parallel with described thread segment 9 and to be fixed with polished rod 4, be respectively arranged with upper limit sensor 3 and lower limit sensor 5 at the two ends of this polished rod 4, be fixedly connected with limited location driving rod 7 on the described nut 8, the end of this spacing driving rod 7 and polished rod 4 are slidingly connected, when the end of spacing driving rod 7 contacts with lower limit sensor 5, described radioactive source 18 is positioned at extreme lower position, when the end of spacing driving rod 7 contacts with upper limit sensor 3, described radioactive source 18 is positioned at the extreme higher position, and the switching signal output terminal that the switching signal output terminal of upper limit sensor 3 is connected with the lower limit sensor is connected with two limit signal input ends of signal processing unit respectively.
Embodiment five, present embodiment are that the described radioactive source 18 of present embodiment is gamma-rays radioactive sources to the further restriction of embodiment one, two, three or four described Continuous Tracking nuclear thing position monitoring devices.
Embodiment six, present embodiment are that the described radioactive source 18 of present embodiment is sealings to the further restriction of embodiment one, two, three or four described Continuous Tracking nuclear thing position monitoring devices
137The Cs gamma ray dot source.
Embodiment seven, present embodiment are the further restrictions to embodiment one, two, three or four described Continuous Tracking nuclear thing position monitoring devices, the ray energy 661Kev of the described radioactive source 18 of present embodiment, intensity 2 * 10
9Bq.
Embodiment eight, present embodiment are that the described detector 17 of present embodiment is photomultiplier to the further restriction of embodiment one, two, three or four described Continuous Tracking nuclear thing position monitoring devices.
Embodiment nine, present embodiment are that described two detectors 17 of present embodiment adopt two-tube photomultiplier to realize to the further restriction of embodiment one, two, three or four described Continuous Tracking nuclear thing position monitoring devices.
Claims (9)
1. Continuous Tracking is examined thing position monitoring device, it is characterized in that, described monitoring device comprises radioactive source (18), two detectors (17), elevating mechanism, elevating mechanism driver element and signal processing unit, described elevating mechanism be used for to drive radioactive source (18) and two detectors (17) and rises synchronously or descend, described two detectors (17) are vertically arranged, upgrading mechanism driver element is used for the driver upgrade mechanism kinematic, signal processing unit receives the signal that two-tube detector (17) sends, and described signal processed and then generates the driving signal of upgrading mechanism driver element, described signal processing unit should drive signal and send to the mechanism's driver element of upgrading.
2. Continuous Tracking according to claim 1 is examined thing position monitoring device, it is characterized in that, also comprise position-limit mechanism in the described monitoring device, described position-limit mechanism is used for extreme higher position and the extreme lower position of restriction radioactive source, and described position-limit mechanism output limit signal is to signal processing unit.
3. Continuous Tracking according to claim 1 is examined thing position monitoring device, it is characterized in that, described elevating mechanism adopts a pair of steel wire around wheel (2), transmission shaft (10), speed reduction unit (14) and gear train are realized, described upgrading mechanism's driver element employing drive motor (15) is realized, the output shaft of described drive motor (15) is by speed reduction unit (14), gear train drives transmission shaft (10) and rotates, a pair of steel wire is separately fixed at the two ends of transmission shaft (10) around wheel (2), steel wire is around the fixing radioactive source (18) of the end of the upper steel wire (1) that twines of wheel (2), and another steel wire is fixed by two detectors (17) around the end of the upper steel wire (1) that twines of wheel (2).
4. Continuous Tracking according to claim 3 is examined thing position monitoring device, it is characterized in that, the centre of described transmission shaft is provided with thread segment (9), be provided with nut (8) on the described thread segment (9), be arranged in parallel with described thread segment (9) and to be fixed with polished rod (4), be respectively arranged with upper limit sensor (3) and lower limit sensor (5) at the two ends of this polished rod (4), be fixedly connected with limited location driving rod (7) on the described nut (8), the end of this spacing driving rod (7) and polished rod (4) are slidingly connected, when the end of spacing driving rod (7) and lower limit sensor (5) when contacting, described radioactive source (18) is positioned at extreme lower position, when the end of spacing driving rod (7) and upper limit sensor (3) when contacting, described radioactive source (18) is positioned at the extreme higher position, and the switching signal output terminal of upper limit sensor (3) is connected 5 with the lower limit sensor) the switching signal output terminal be connected with two limit signal input ends of signal processing unit respectively.
5. Continuous Tracking according to claim 1 is examined thing position monitoring device, it is characterized in that described radioactive source (18) is the gamma-rays radioactive source.
6. Continuous Tracking according to claim 1 is examined thing position monitoring device, it is characterized in that, described radioactive source (18) is sealing
137The Cs gamma ray dot source.
7. Continuous Tracking according to claim 1 is examined thing position monitoring device, it is characterized in that the ray energy 661Kev of described radioactive source (18), intensity 2 * 10
9Bq.
8. Continuous Tracking according to claim 1 is examined thing position monitoring device, it is characterized in that described detector (17) is photomultiplier.
9. Continuous Tracking according to claim 1 is examined thing position monitoring device, it is characterized in that, described two detectors (17) adopt two-tube photomultiplier to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220401530 CN202693502U (en) | 2012-08-14 | 2012-08-14 | Continuous following nuclear level monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220401530 CN202693502U (en) | 2012-08-14 | 2012-08-14 | Continuous following nuclear level monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202693502U true CN202693502U (en) | 2013-01-23 |
Family
ID=47549105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220401530 Expired - Fee Related CN202693502U (en) | 2012-08-14 | 2012-08-14 | Continuous following nuclear level monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202693502U (en) |
-
2012
- 2012-08-14 CN CN 201220401530 patent/CN202693502U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20130814 |