CN109839060A - Steel cap installation centering deflection detection apparatus based on electric capacitance change principle - Google Patents
Steel cap installation centering deflection detection apparatus based on electric capacitance change principle Download PDFInfo
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Abstract
Steel cap installation centering deflection detection apparatus based on electric capacitance change principle, it is related to steel cap mounting technique field, including bottom plate, movement mechanism is connected in the middle part of the bottom plate, the shape of the bottom plate is circle, the front of the movement mechanism is connected with slave thread component, the inner wall of the slave thread component is provided with screw thread, screw rod is connected in the middle part of the slave thread component, the screw rod is located at the inside of slave thread component and matched, and the front of the bottom plate is flexibly connected that there are three limited blocks.The steel cap installation centering deflection detection apparatus based on electric capacitance change principle, when change in location occurs between movable polar plate and fixed polar plate, positive area between the two at this time can change, and then change capacitance, i.e. material is deflected at this time, measured by the variation to capacitance, can the position form quickly to material detect, improve the accuracy of the device.
Description
Technical field
The present invention relates to steel cap mounting technique fields, the steel cap installation centering deflection specially based on electric capacitance change principle
Detection device.
Background technique
Steel cap is generally used to carry out closure sealing to the both ends of opening conduit, needs to pass through the two into weldering during the installation process
The mode connect is fixed together, and needs to guarantee the concentricity between steel cap and pipeline in the process, if concentricity between the two
It is poor, it may cause between welding finished product that there are gaps, influence the leakproofness of product, causing in use may generation
The risk of leakage, meanwhile, during the installation process if steel cap deflects, it may cause that solder joint is unstable or weld seam is uneven
It is even, or even the occurrence of will cause solder skip, exert a certain influence to the stabilization in subsequent use process.
To solve the above problems, inventor proposes the installation centering deflection detection dress of the steel cap based on electric capacitance change principle
It sets, has the advantages of self-centering and deflection detection, it is ensured that self-centering between material and mounting surface during the installation process, simultaneously
Real-time monitoring and early warning are carried out to the deflection situation of material and steel cap, the principle of formula is determined using capacitor, by capacitance
Variation measures, can the position form quickly to material detect, improve the accuracy of the device.
Summary of the invention
To realize above-mentioned self-centering and deflection detection purpose, the invention provides the following technical scheme: being based on capacitor quantitative change
Change principle steel cap installation centering deflection detection apparatus, including bottom plate, movement mechanism, slave thread component, screw rod, limited block,
Card column, positioning seat, fixing seat, material, cavity, axle sleeve, transmission shaft, movable polar plate and fixed polar plate.
Wherein: the movement mechanism includes movable plate, locating detent and locating slot.
Position and connection relationship between above-mentioned each structure is as follows:
Movement mechanism is connected in the middle part of the bottom plate, the shape of the bottom plate is circle, the movement mechanism
Front is connected with slave thread component, and the inner wall of the slave thread component is provided with screw thread, the slave thread component
Middle part be connected with screw rod, the screw rod is located at the inside of slave thread component and matched, and the bottom plate is just
Face is flexibly connected there are three limited block, and the shape specification of three limited blocks is all the same, limited block position arcuate structure and
The center of circle and the center of circle of bottom plate are same point, i.e., the distance of three limited blocks to bottom plate central axes is identical, and two neighboring
Spacing between the limited block is identical, i.e. three limited blocks are that reference is evenly distributed with the central axes of bottom plate.
There are three card columns for the outside flexible connection of the movement mechanism, and three card column shape specifications are all the same, described
The one end of card column far from movement mechanism is curved-surface structure and curved surface degree is identical as the curved surface degree of positioning seat, three card column difference
It is corresponding with three positioning seats, i.e., the distance between the distance between two neighboring card column and the two neighboring positioning seat phase
Together, the distance at the endpoint of three card columns to movement mechanism center is identical, i.e., three card columns are with the midpoint of movement mechanism
It is evenly distributed for reference.
Positioning seat is connected on the outside of the card column, the shape specification of three positioning seats is identical, the positioning
The one end of seat far from bottom plate center is curved-surface structure, and curved surface degree is identical as the curved surface degree on card column top, two neighboring described fixed
Spacing between the seat of position is identical, i.e. three positioning seats are that reference is evenly distributed, and three described fixed with the central axes of bottom plate
The distance at endpoint to the bottom plate midpoint of position seat is identical, and the arranged on left and right sides of the positioning seat is fixedly connected with fixing seat, described in three
Material is connected on the outside of card column.
The back side of the bottom plate is fixedly connected with cavity, and axle sleeve is connected on the right side of the cavity, the axle sleeve
Internal activity is connected with transmission shaft, the bottom plate, movement mechanism, slave thread component, screw rod, cavity, axle sleeve and transmission shaft
Central axes on the same line, are connected with movable polar plate, the outside activity of the movable polar plate on the outside of the transmission shaft
It is connected with fixed polar plate, the movable polar plate and fixed polar plate are respectively positioned on the inside of axle sleeve, and the movable polar plate and transmission shaft are living
Dynamic connection, the fixed polar plate are fixedly connected with the inner wall of axle sleeve, and the movable polar plate and fixed polar plate are two concentric half
Circular ring structure, the diameter of the movable polar plate are twice of fixed polar plate diameter, and movable polar plate is plugged on the middle part of fixed polar plate
And the two fits closely.
The movement mechanism includes movable plate, and the bottom of the movable plate is fixedly connected there are three locating detent, described in three
Locating detent is that reference is evenly distributed with the midpoint of movable plate, i.e., the spacing between the two neighboring locating detent is identical, and
The distance at three locating detents to movable plate midpoints is identical, and three card columns are corresponding with three locating detents respectively,
The inside of the locating detent offers locating slot.
Preferably, the distance between the distance between two neighboring described limited block, two neighboring described positioning seat
Identical, i.e., the angle between the two neighboring limited block is equal to the angle between the two neighboring positioning seat.
Preferably, the axle sleeve, transmission shaft, movable polar plate and fixed polar plate central axes on the same line.
Preferably, the depth of the cavity is greater than the sum of movable plate and the height of locating detent.
Preferably, the screw rod is flexibly connected with transmission shaft, the screw rod is identical as the diameter of transmission shaft and central axes
On the same line, and the transmission shaft runs through and extends to the outside of cavity.
Preferably, the limited block is flexibly connected by two bolts with bottom plate, the surface of the bottom plate offers three
Group bar shaped screw hole, three groups of bar shaped screw holes are corresponding with three limited blocks respectively.
Compared with the prior art and product, the beneficial effects of the present invention are:
1, the deflection detection apparatus that should be felt relieved based on the steel cap installation of electric capacitance change principle can be the device by bottom plate
Whole to provide the stable connection for supporting and maintaining between each structure, guarantee will not be led during the work time because structure deflects
Cause has an impact service precision, by slave thread component and screw rod, is rotated using the principle of bolt and nut by screw rod
Slave thread component movement is driven, the operability of the device is improved, by connecting two bolts of limited block and bottom plate activity
It connects, the surface of bottom plate offers three groups of bar shaped screw holes, and three groups of bar shaped screw holes are corresponding with three limited blocks respectively, can be in the straight of material
When minimum range between less than three positioning seats of diameter, by changing the position of three limited blocks, it is applicable to smaller size
Material increases the practicability and applicability of the device, improves the utilization rate of the device.
2, it should can be driven based on the steel cap installation centering deflection detection apparatus of electric capacitance change principle by movement mechanism
Three card column movements, since three card column shape specifications are all the same, the one end of card column far from movement mechanism is curved-surface structure and song
Face degree is identical as the curved surface degree of positioning seat, and three card columns are corresponding with three positioning seats respectively, i.e., between two neighboring card column
Distance is identical as the distance between two neighboring positioning seat, and the distance at endpoint to the movement mechanism center of three card columns is identical, i.e.,
Three card columns are that reference is evenly distributed, and three locating detents are that reference is in the midpoint of movable plate with the midpoint of movement mechanism
It being uniformly distributed, i.e., the spacing between two neighboring locating detent is identical, and the distance at three locating detents to movable plate midpoints is identical,
Three card columns are corresponding with three locating detents respectively, so three card columns can be driven to move synchronously when movable plate movement, it can
Realize that the self-centering purpose of the device, error caused by avoiding because of decentraction in installation process improve the use of the device
Precision.
It 3, should be based on the steel cap installation centering deflection detection apparatus of electric capacitance change principle, by being changed using positive area
And then influence the principle of electric capacitance change, accurate and visual can be detected to whether material deflects, by movable polar plate and
Fixed polar plate is respectively positioned on the inside of axle sleeve, and movable polar plate is flexibly connected with transmission shaft, and the inner wall of fixed polar plate and axle sleeve is fixed to be connected
It connects, movable polar plate and fixed polar plate are two concentric semicircle ring structures, and the diameter of movable polar plate is the two of fixed polar plate diameter
Times, movable polar plate is plugged on the middle part of fixed polar plate and the two fits closely, in normal state movable polar plate and fixed polar plate
Between position it is relatively stable, positive area between the two at this time is constant, then capacitance does not change at this time, i.e. expression thing
Material does not deflect, when change in location occurs between movable polar plate and fixed polar plate, positive area meeting between the two at this time
It changes, and then changes capacitance, i.e., material is deflected at this time, is measured by the variation to capacitance, can be fast
Detecting to the position form of material for speed, improves the accuracy of the device.
Detailed description of the invention
Fig. 1 is connection structure top view of the present invention, and each structure is in original state, i.e. the distance between three card columns at this time
It is relatively stable；
Fig. 2 is connection structure left view of the present invention；
Fig. 3 is card column of the present invention and positioning seat connection structure top view, and three card columns are in initial position, i.e., three at this time
The distance between card column is smaller；
Fig. 4 is card column of the present invention and positioning seat movement locus schematic diagram, at this time the state between each structure after adjusting, three
The distance between a card column increases；
Fig. 5 is card column of the present invention and locating detent attachment structure schematic diagram, and card column and locating detent are in home position at this time,
The distance between three card columns are smaller；
Fig. 6 is card column of the present invention and locating detent movement locus schematic diagram, and card column is moved with locating detent at this time, three cards
The distance between column increases；
Fig. 7 is movable polar plate of the present invention and fixed polar plate attachment structure schematic diagram, both at this time in initial position, i.e., two
Positive area between person is stablized, and capacitance is constant at this time, i.e. expression material does not deflect；
Fig. 8 is movable polar plate of the present invention and fixed polar plate movement locus schematic diagram one, and the two generates relative motion at this time, living
Movable plate electrode rotates clockwise, i.e., angle between the two increases, positive area reduces, and capacitance becomes smaller at this time, i.e. expression thing
Material deflects；
Fig. 9 is movable polar plate of the present invention and fixed polar plate movement locus schematic diagram two, and angle between the two at this time is into one
Step increases, and positive area further decreases, i.e., capacitance is further decreased compared with Fig. 8, and the amplitude for indicating that material deflects is greater than
Deflection amplitude shown in Fig. 8；
Figure 10 is movable polar plate of the present invention and fixed polar plate movement locus schematic diagram three, and movable polar plate is made to turn counterclockwise at this time
Dynamic, principle and process are identical as Fig. 8 and Fig. 9, i.e. expression material deflects；
Figure 11 is limited block of the present invention and connecting structure of bottom plate top view, and the two is in initial position, three limits at this time
The distance between block is smaller；
Figure 12 is limited block movement locus schematic diagram of the present invention, and position change, i.e., three occur on bottom plate for limited block at this time
The distance between a limited block increases.
In figure: 1- bottom plate, 2- movement mechanism, 3- slave thread component, 4- screw rod, 5- limited block, 6- card column, 7- positioning
Seat, 8- fixing seat, 9- material, 10- cavity, 11- axle sleeve, 12- transmission shaft, 13- movable polar plate, 14- fixed polar plate, 21- activity
Plate, 22- locating detent, 23- locating slot.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-12:
This based on electric capacitance change principle steel cap installation centering deflection detection apparatus, including bottom plate 1, movement mechanism 2, from
Dynamic threaded components 3, screw rod 4, limited block 5, card column 6, positioning seat 7, fixing seat 8, material 9, cavity 10, axle sleeve 11, transmission shaft 12,
Movable polar plate 13 and fixed polar plate 14.
Wherein: movement mechanism 2 includes movable plate 21, locating detent 22 and locating slot 23.
Wherein:
A, movable polar plate 13 and fixed polar plate 14 are respectively positioned on the inside of axle sleeve 11,12 activity of movable polar plate 13 and transmission shaft
Connection, fixed polar plate 14 are fixedly connected with the inner wall of axle sleeve 11, and movable polar plate 13 and fixed polar plate 14 are two concentric semicircles
Ring structure, the diameter of movable polar plate 13 are twice of 14 diameter of fixed polar plate, and movable polar plate 13 is plugged on fixed polar plate 14
Middle part and the two fits closely, the distance between two neighboring limited block 5, the distance between two neighboring positioning seat 7 is identical,
Angle between i.e. two neighboring limited block 5 is equal to the angle between two neighboring positioning seat 7.
B, three locating detents 22 are that reference is evenly distributed with the midpoint of movable plate 21, i.e., between two neighboring locating detent 22
Spacing it is identical, and the distance at three locating detents 22 to 21 midpoint of movable plate is identical, and three card columns 6 are positioned with three respectively
Pawl 22 is corresponding, and limited block 5 is flexibly connected by two bolts with bottom plate 1, and the surface of bottom plate 1 offers three groups of bar shaped screw holes,
Three groups of bar shaped screw holes are corresponding with three limited blocks 5 respectively.
C, three 6 shape specifications of card column are all the same, and the one end of card column 6 far from movement mechanism 2 is curved-surface structure and curved surface degree
Identical as the curved surface degree of positioning seat 7, three card columns 6 are corresponding with three positioning seats 7 respectively, i.e., between two neighboring card column 6
Distance is identical as the distance between two neighboring positioning seat 7, the distance phase of the endpoint of three card columns 6 to 2 center of movement mechanism
Together, i.e. three card columns 6 are that reference is evenly distributed with the midpoint of movement mechanism 2.
Wherein:
D, screw rod 4 is flexibly connected with transmission shaft 12, and screw rod 4 is identical as the diameter of transmission shaft 12 and central axes are in same straight line
On, and transmission shaft 12 runs through and extends to the outside of cavity 10, and the shape specification of three positioning seats 7 is identical, and positioning seat 7 is separate
The one end at 1 center of bottom plate is curved-surface structure, and curved surface degree is identical as the curved surface degree on 6 top of card column, two neighboring positioning seat 7 it
Between spacing it is identical, i.e. three positioning seats 7 are and the end of three positioning seats 7 referring to being evenly distributed with the central axes of bottom plate 1
The distance at point to 1 midpoint of bottom plate is identical.
E, the central axes of bottom plate 1, movement mechanism 2, slave thread component 3, screw rod 4, cavity 10, axle sleeve 11 and transmission shaft 12
On the same line, the shape of bottom plate 1 is circle, and the inner wall of slave thread component 3 is provided with screw thread, and screw rod 4 is located at driven spiral shell
The inside of line component 3 and matched, axle sleeve 11, transmission shaft 12, movable polar plate 13 and fixed polar plate 14 central axes same
On one straight line.
F, the depth of cavity 10 is greater than the sum of the height of movable plate 21 and locating detent 22, the shape specification of three limited blocks 5
All the same, 5 arcuate structures of limited block and the center of circle and the center of circle of bottom plate 1 are same point, i.e., three limited blocks 5 arrive 1 axis of bottom plate
The distance of line is identical, and the spacing between two neighboring limited block 5 is identical, i.e., three limited blocks 5 are with the central axes of bottom plate 1
Reference is evenly distributed.
When in use, the initial position between each structure and connection relationship are as follows:
Transmission shaft 12 is plugged on the inside of movable polar plate 13 and is rotatablely connected with it, and movable polar plate 13 is plugged on fixed pole
The inside of plate 14 and be slidably connected with it, fixed polar plate 14 is located at the inside of axle sleeve 11 and is secured to weld, transmission shaft 12 with
The flexible connection of screw rod 4 and screw rod 4 are plugged on the inside of slave thread component 3, and slave thread component 3 and movable plate 21 pass through spiral shell
Nail is flexibly connected, and three locating detents 22 are movably hinged respectively with three card columns 6 and three locating detents 22 are fixed with movable plate 21
Welding, three card columns 6 be located at the inside of three positioning seats 7 and with its activity grafting, three limited blocks 5 pass through screw and bottom
Plate 1 is flexibly connected.
Above structure and process please refer to Fig. 1-2, Fig. 5 and Fig. 7.
Screw rod 4 can be driven to rotate synchronously by rotating clockwise transmission shaft 12, by the principle of bolt and nut it is found that working as
When screw rod 4 rotates clockwise, slave thread component 3 can be driven to move horizontally to the right, by above-mentioned connection relationship it is found that driven spiral shell
Line component 3 is flexibly connected with movable plate 21, so movable plate 21 can be driven to synchronize fortune in the same direction when slave thread component 3 moves
Dynamic, i.e., movable plate 21 moves horizontally to the right at this time.
When movable plate 21 moves horizontally to the right, the movement in the same direction synchronous with locating slot 23 of three locating detents 22 can be driven, by
It is movably hinged respectively with three locating detents 22 in three card columns 6, and the shape of locating slot 23 is intilted ramp-like structure, institute
Reduce so that three card columns 6 are synchronous at this time to the distance between contract i.e. three card column 6, similarly, when transmission shaft 12 is made counterclockwise
When rotation, can be driven by the above process with principle three card columns 6 synchronize move out i.e. the distance between three card columns 6 increasing
Greatly.
By moving synchronously three card columns 6 and making it in the initial state with bottom plate 1 in concentric, it is ensured that three
Card column 6 contacts simultaneously with 9 inner wall of material, and then guarantees to be concentric between material 9 and bottom plate 1 by the state of clamping.
Above structure and process please refer to Fig. 3-6.
Since three card columns 6 are contacted with material 9, so when material 9 deflects movable plate 21 can be driven by card column 6
It moves synchronously, and then screw rod 4 and transmission shaft 12 can be driven to move synchronously by movable plate 21, pass through above-mentioned position and connection relationship
It is found that movable polar plate 13 is connect with transmission shaft 12, so transmission shaft 12 can drive movable polar plate 13 to move synchronously at this time.
Formula is determined using capacitor capacitance it is found that when movable polar plate 13 moves the right opposite between Shi Qiyu fixed polar plate 14
Product changes, and capacitance changes at this time, can intuitively embody whether material 9 occurs partially by detecting to capacitance
Turn, also, the amplitude that movable polar plate 13 moves is bigger, positive area between the two is smaller, then capacitance is smaller, passes through capacitor
The variation of amount can also be monitored the degree of deflection of material 9.
Capacitor determines that formula is as follows:
In formula:
C: capacitor；
ε: dielectric constant；
S: positive area, the contact area between referred to two semicircle pole plates；
K: electrostatic force constant；
θ: angle when two-plate moves.
If A, θ increases, i.e., the contact area between two semicircle pole plates reduces, and positive area S reduces at this time, thenThe numerical value of middle capacitor C reduces, i.e. expression material 9 deflects；
If B, θ is constant, i.e., the contact area between two semicircle pole plates is constant, and positive area S is constant at this time, thenThe numerical value of middle capacitor C is constant, i.e., expression material 9 is to deflect.
Above structure principle and process please refer to Fig. 7-10.
It is attached:
By adjusting position of the limited block 5 on bottom plate 1, the diameter for being applicable to material 9 is less than the minimum of positioning seat 7 directly
The case where diameter.
Above structure and process please refer to Figure 11-12.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. the steel cap installation centering deflection detection apparatus based on electric capacitance change principle, including bottom plate (1), it is characterised in that: institute
It states and is connected in the middle part of bottom plate (1) movement mechanism (2), the front of the movement mechanism (2) is connected with slave thread
Component (3) is connected with screw rod (4) in the middle part of the slave thread component (3), and the front of the bottom plate (1) is flexibly connected
There are three limited block (5), and there are three card column (6), the outsides of the card column (6) for the outside flexible connection of the movement mechanism (2)
It is connected with positioning seat (7), the arranged on left and right sides of the positioning seat (7) is fixedly connected with fixing seat (8), three card columns
(6) material (9) are connected on the outside of；
The back side of the bottom plate (1) is fixedly connected with cavity (10), is connected with axle sleeve (11) on the right side of the cavity (10),
The internal activity of the axle sleeve (11) is connected with transmission shaft (12), is connected with movable polar plate on the outside of the transmission shaft (12)
(13), fixed polar plate (14) are connected on the outside of the movable polar plate (13)；
The movement mechanism (2) includes movable plate (21), and the bottom of the movable plate (21) is fixedly connected there are three locating detent
(22), the inside of the locating detent (22) offers locating slot (23).
2. the steel cap installation centering deflection detection apparatus according to claim 1 based on electric capacitance change principle, feature
It is: the bottom plate (1), movement mechanism (2), slave thread component (3), screw rod (4), cavity (10), axle sleeve (11) and transmission
On the same line, the shape of the bottom plate (1) is circle, the inner wall of the slave thread component (3) for the central axes of axis (12)
It is provided with screw thread, the screw rod (4) is located at the inside of slave thread component (3) and matched.
3. the steel cap installation centering deflection detection apparatus according to claim 1 based on electric capacitance change principle, feature
Be: the shape specification of three limited blocks (5) is all the same, limited block (5) the position arcuate structure and the center of circle and bottom plate (1)
The center of circle be same point, i.e. the distance of three limited blocks (5) to bottom plate (1) central axes is identical, and two neighboring described
Spacing between limited block (5) is identical, i.e. three limited blocks (5) are that reference is evenly distributed with the central axes of bottom plate (1).
4. the steel cap installation centering deflection detection apparatus according to claim 1 based on electric capacitance change principle, feature
Be: three card column (6) shape specifications are all the same, and the one end of the card column (6) far from movement mechanism (2) is curved-surface structure
And curved surface degree is identical as the curved surface degree of positioning seat (7), three card columns (6) are corresponding with three positioning seat (7) respectively, i.e. phase
Identical, three card columns (6) of the distance between the two neighboring positioning seat (7) of the distance between adjacent two card columns (6)
Endpoint to movement mechanism (2) center distance it is identical, i.e., three card columns (6) are using the midpoint of movement mechanism (2) as reference
It is evenly distributed.
5. the steel cap installation centering deflection detection apparatus according to claim 1 based on electric capacitance change principle, feature
Be: the shape specification of three positioning seats (7) is identical, and the one end of the positioning seat (7) far from bottom plate (1) center is curved surface
Structure, and curved surface degree is identical as the curved surface degree on card column (6) top, the spacing between the two neighboring positioning seat (7) is identical, i.e.,
Three positioning seats (7) are that reference is evenly distributed, and the endpoint of three positioning seats (7) arrives with the central axes of bottom plate (1)
The distance at bottom plate (1) midpoint is identical.
6. the steel cap installation centering deflection detection apparatus according to claim 1 based on electric capacitance change principle, feature
Be: the movable polar plate (13) and fixed polar plate (14) are respectively positioned on the inside of axle sleeve (11), the movable polar plate (13) and pass
Moving axis (12) is flexibly connected, and the fixed polar plate (14) is fixedly connected with the inner wall of axle sleeve (11), the movable polar plate (13) and
Fixed polar plate (14) is two concentric semicircle ring structures, and the diameter of the movable polar plate (13) is fixed polar plate (14) diameter
Twice, movable polar plate (13) is plugged on the middle part of fixed polar plate (14) and the two fits closely.
7. the steel cap installation centering deflection detection apparatus according to claim 1 based on electric capacitance change principle, feature
Be: three locating detents (22) are evenly distributed with the midpoint of movable plate (21) for reference, i.e., the two neighboring positioning
Spacing between pawl (22) is identical, and the distance at three locating detents (22) to movable plate (21) midpoint is identical, three institutes
It is corresponding with three locating detent (22) respectively to state card column (6).
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| CN201910126505.5A CN109839060B (en) | 2019-02-20 | 2019-02-20 | Steel cap installation centering deflection detection device based on capacitance change principle |
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| CN201910126505.5A CN109839060B (en) | 2019-02-20 | 2019-02-20 | Steel cap installation centering deflection detection device based on capacitance change principle |
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| CN109839060B CN109839060B (en) | 2020-12-11 |
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| CN110174043A (en) * | 2019-06-24 | 2019-08-27 | 黄圣扬 | Engineering pipeline offset detecting device based on cutting magnetic induction line principle |
| CN110979899A (en) * | 2019-11-25 | 2020-04-10 | 魏治华 | Telescopic petroleum barrel capable of triggering leakage early warning based on capacitance change principle |
| CN111359039A (en) * | 2020-02-20 | 2020-07-03 | 吉林大学 | Be used for uremia hemodialysis internal fistula bracelet of autosurvey |
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| CN111359039A (en) * | 2020-02-20 | 2020-07-03 | 吉林大学 | Be used for uremia hemodialysis internal fistula bracelet of autosurvey |
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