CN112325995A - A non-magnetic water meter calibration device - Google Patents
A non-magnetic water meter calibration device Download PDFInfo
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- CN112325995A CN112325995A CN202011246871.3A CN202011246871A CN112325995A CN 112325995 A CN112325995 A CN 112325995A CN 202011246871 A CN202011246871 A CN 202011246871A CN 112325995 A CN112325995 A CN 112325995A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
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- UFNIBRDIUNVOMX-UHFFFAOYSA-N 2,4'-dichlorobiphenyl Chemical compound C1=CC(Cl)=CC=C1C1=CC=CC=C1Cl UFNIBRDIUNVOMX-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
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- 241000973621 Concinnum ten Species 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
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Abstract
本发明提供一种无磁水表校验装置，包括模拟水流转速的转速动力机构、计量模拟水流转速的计量机构、支撑无磁探测线圈和无磁PCB板的无磁PCB座、调整无磁PCB座和计量机构相对间距的调距机构和机架，所述计量机构上设有供半圆金属指针设置的连接部；机架包括底座；转速动力机构设置在底座上，且其动力输出端与计量机构的动力输入端连接，无磁PCB座、计量机构和转速动力机构依次自上而下设置；通过计量机构的转速计量值和无磁探测线圈感应到的转速感应值对比以校验无磁感应组件的准确性，通过调距机构调整无磁PCB座和计量机构之间的间距以得到最佳探测距离，本发明能够为无磁水表的优化设计以及生产制造提供依据。
The invention provides a non-magnetic water meter calibration device, including a rotational speed power mechanism for simulating the rotational speed of water flow, a metering mechanism for measuring the rotational speed of the simulated water flow, a non-magnetic PCB seat for supporting a non-magnetic detection coil and a non-magnetic PCB board, and a non-magnetic PCB seat for adjusting A distance-adjusting mechanism and a frame relative to the measuring mechanism, the measuring mechanism is provided with a connecting part for setting the semi-circular metal pointer; the frame includes a base; the rotational speed power mechanism is arranged on the base, and its power output end is connected to the measuring mechanism The non-magnetic PCB base, the metering mechanism and the rotational speed power mechanism are set in sequence from top to bottom; the rotational speed measurement value of the metering mechanism and the rotational speed induction value sensed by the non-magnetic detection coil are compared to verify the non-magnetic induction components. The distance between the non-magnetic PCB base and the measuring mechanism is adjusted by the distance adjusting mechanism to obtain the best detection distance, and the invention can provide the basis for the optimal design and production of the non-magnetic water meter.
Description
Technical Field
The invention relates to the technical field of water meter calibration, in particular to a non-magnetic water meter calibration device.
Background
The non-magnetic water meter is characterized in that a semicircular metal pointer for lifting is added on the basis of the traditional mechanical water meter. When the water flow passes through, the semicircular metal pointer is driven to rotate, and the rotation of the metal pointer forms electromotive force influence on the nonmagnetic metering plate, so that nonmagnetic metering data acquisition is realized. Therefore, the optimal detection distance between the non-magnetic metering plate and the semicircular metal pointer is a key factor influencing the accuracy of the non-magnetic metering, and therefore detection distance verification and conversion counting comparison are needed in the design and production processes of the non-magnetic metering plate to verify the accuracy of the magnetic metering.
When the non-magnetic water meters are produced in batches, whether the products are qualified or not can be tested and identified only after the electronic module and the mechanical part of the whole non-magnetic water meter are completely assembled, once the phenomenon of inaccurate water metering exists, the reason of the problem is difficult to be attributed to the mechanical part or the electronic module part, and the whole non-magnetic water meter can only be taken as an unqualified product, so that the resource waste is caused. On the other hand, when the non-magnetic water meter in use breaks down to cause inaccurate water metering, maintenance personnel can not find the cause of the problem quickly and accurately.
The traditional Chinese patent (application number: CN200920119153.2) discloses a device for testing the water metering performance of an electronic module in a nonmagnetic water meter, which comprises a shell, wherein a stepping motor and a signal processing circuit are arranged in the shell, a disc is connected to a rotor of the stepping motor, a metal patch is arranged on the upper surface of the disc, and two grooves which are positioned above the disc are arranged on the shell.
Therefore, there is a need for a non-magnetic water meter calibration device, which can realize the detection distance calibration and the measurement accuracy calibration of the non-magnetic water meter in the production process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a non-magnetic water meter calibration device which can realize detection distance calibration and metering accuracy calibration of the non-magnetic water meter in the production process.
In order to achieve the above object, the present invention provides a non-magnetic water meter calibration apparatus, comprising:
the rotating speed power mechanism is used for simulating the rotating speed of the water flow;
the metering mechanism is used for metering the counting of the rotating speed of the simulated water flow, and a connecting part for arranging the semicircular metal pointer is arranged on the metering mechanism;
the non-magnetic PCB seat is used for supporting the non-magnetic detection coil and the non-magnetic PCB;
the distance adjusting mechanism is used for adjusting the relative distance between the nonmagnetic PCB seat and the metering mechanism so as to measure the optimal detection distance;
a frame including a base;
the rotating speed power mechanism is arranged on the base, the power output end of the rotating speed power mechanism is connected with the power input end of the metering mechanism, and the non-magnetic PCB seat, the metering mechanism and the rotating speed power mechanism are sequentially arranged from top to bottom; the accuracy of the non-magnetic induction assembly is verified by comparing the rotating speed metering value of the metering mechanism with the rotating speed induction value induced by the non-magnetic detection coil.
As a further improvement of the scheme, the rotating speed power mechanism comprises a driving motor and a shaft sleeve, the tail part of the driving motor is connected with the base and is in a vertically upward state, and the driving motor is connected with the power input end of the metering mechanism through the shaft sleeve.
As a further improvement of the above scheme, the rotating speed power mechanism further comprises a power switch, a speed regulating switch and a rotating speed display which are respectively arranged on the base, wherein the power switch is used for controlling the start of the driving motor, the speed regulating switch is used for regulating the rotating speed of the driving motor, and the rotating speed display is used for displaying the actual rotating speed sensed by the non-magnetic pointer.
As a further improvement of the above scheme, the metering mechanism comprises a gear rib position counting mechanism, a turbine carry counting mechanism and a character wheel carry counting mechanism, wherein the gear rib position counting mechanism comprises gear components which are sequentially in transmission connection; the character wheel carry mechanism comprises a character wheel assembly, an axle, a cone assembly and a turbine disc, wherein the character wheel assembly and the turbine disc are respectively arranged on the axle, and the cone assembly can drive a character wheel of the character wheel assembly to carry in a rotating manner through the axle; the turbine carry counting mechanism is arranged between the character wheel carry counting mechanism and the gear rib position counting mechanism, the turbine carry counting mechanism comprises a worm wheel, the worm wheel comprises a worm wheel part and a lower gear arranged at the lower end of the worm wheel part, the worm wheel part is meshed with a turbine disc on the wheel shaft to drive a character wheel assembly to rotate in one position, and the lower gear is meshed with a gear assembly in the gear rib position counting mechanism.
As a further improvement of the above scheme, a connecting part for connecting the semicircular metal pointer is arranged on any gear shaft of the gear assembly.
As a further improvement of the above scheme, the metering mechanism further comprises a metering base and a metering cover, the gear rib position counting mechanism, the turbine carry counting mechanism and the character wheel carry counting mechanism are all arranged on the metering base, and the metering cover is arranged on the gear rib position counting mechanism, the turbine carry counting mechanism and the character wheel carry counting mechanism.
As a further improvement of the above scheme, the rack further comprises a first vertical support, a fixing ring and a second vertical support, one end of the first vertical support is connected with the base, the other end of the first vertical support is connected with the fixing ring, one end of the second vertical support is connected with the fixing ring, and the other end of the second vertical support is connected with the metering mechanism.
As a further improvement of the scheme, a threaded hole for mounting the non-magnetic detection coil is formed in the non-magnetic PCB seat, and the position of the threaded hole corresponds to the position of the connecting part for connecting the semicircular metal pointer, which is arranged on the metering mechanism, in an up-and-down mode.
As a further improvement of the scheme, a reading window for reading of the metering mechanism is further formed in the non-magnetic PCB seat.
As a further improvement of the above scheme, the distance adjusting mechanism includes an adjusting bolt and a lock nut, one end of the adjusting bolt is arranged on the nonmagnetic PCB seat in a penetrating manner, the other end of the adjusting bolt is in threaded connection with the metering mechanism, and the lock nut is connected with the adjusting bolt and used for locking the current adjusting position.
As a further improvement of the scheme, at least two adjusting bolts are arranged and are evenly distributed along the circumferential direction of the non-magnetic PCB seat, and correspondingly, two locking nuts are arranged on each adjusting bolt.
It should be noted that the non-magnetic detection coil and the non-magnetic PCB are integrated, and the non-magnetic PCB is arranged right above the non-magnetic detection coil.
The use method of the nonmagnetic water meter calibration device comprises the following steps:
firstly, a semicircular metal pointer of a nonmagnetic induction component to be detected is installed on an installation part of a metering mechanism, then a nonmagnetic detection coil of the nonmagnetic induction component and a nonmagnetic PCB arranged above the nonmagnetic detection coil are fixed on a nonmagnetic PCB seat, a rotating speed power mechanism is started, the distance between the semicircular metal pointer and the nonmagnetic detection coil is adjusted through a distance adjusting mechanism, the reading value of the metered rotating speed of the metering mechanism and the rotating speed value sensed by the nonmagnetic induction component at each distance are recorded, and the difference between the reading value and the rotating speed value is compared to obtain the proper distance setting; in addition, the accuracy of the induced rotating speed value of the non-magnetic induction component under different rotating speeds can be detected, so that the flow speed application range of the non-magnetic induction component can be obtained.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention provides a nonmagnetic water meter calibration device, which comprises a rotating speed power mechanism for simulating the rotating speed of water flow, a metering mechanism for metering the rotating speed of the simulated water flow, a nonmagnetic PCB (printed Circuit Board) seat for supporting a nonmagnetic detection coil and a nonmagnetic PCB (printed Circuit Board), a distance adjusting mechanism for adjusting the relative distance between the nonmagnetic PCB seat and the metering mechanism and a rack, wherein the metering mechanism is provided with a connecting part for arranging a semicircular metal pointer; the frame comprises a base; the rotating speed power mechanism is arranged on the base, the power output end of the rotating speed power mechanism is connected with the power input end of the metering mechanism, and the non-magnetic PCB seat, the metering mechanism and the rotating speed power mechanism are sequentially arranged from top to bottom; the accuracy of the nonmagnetic induction component is verified through the comparison of the rotating speed metering value of the metering mechanism and the rotating speed induction value sensed by the nonmagnetic detection coil, and the optimal detection distance is obtained through adjusting the relative distance between the nonmagnetic PCB seat and the metering mechanism.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic perspective view of a non-magnetic water meter calibration apparatus according to the present invention;
FIG. 2 is a schematic diagram showing a portion of the non-magnetic water meter calibration apparatus according to the present invention in an exploded view;
FIG. 3 is a front view of the metering mechanism of the present invention with the metering cap removed;
FIG. 4 is a perspective view of the metering mechanism of the present invention with the metering cap removed;
FIG. 5 is a front view of the metering mechanism of the present invention with a metering cap;
FIG. 6 is a side view of the metering mechanism of the present invention with a metering cap;
reference numerals:
1. a rotating speed power mechanism; 11. a drive motor; 12. a shaft sleeve; 13. a power switch; 14. a speed regulating switch; 15. a rotational speed display;
2. a metering mechanism; 21. a gear rib position counting mechanism; 211. a gear assembly; 212. a power input; 22. a turbine carry counting mechanism; 221. a worm wheel; 2211. a worm gear portion; 2212. a lower gear; 23. a character wheel carry counting mechanism; 231. a print wheel assembly; 232. a wheel axle; 233. a cone assembly; 234. a turbine disk; 24. a metering base; 25. a metering cover;
3. a non-magnetic PCB base;
4. a distance adjusting mechanism; 41. adjusting the bolt; 42. locking the nut;
5. a frame; 51. a base; 52. a first vertical support; 53. a fixing ring; 54. a second vertical support;
6. a semi-circular metal pointer; 7. a non-magnetic detection coil; 8. a non-magnetic PCB board;
a. thousand tonnages; b. hundred tonnages; c. ten tonnages; d. tonnage; e. counting the tonnage; f. counting hundreds of liters; g. counting in ten liters; h. and (4) counting the semicircular metal pointer in an ascending way.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention is further described below with reference to the following figures and specific embodiments:
referring to fig. 1 to 6, the present invention provides a non-magnetic water meter calibration apparatus, including:
the rotating speed power mechanism 1 is used for simulating the rotating speed of water flow;
the metering mechanism 2 is used for metering the counting of the rotating speed of the simulated water flow, and a connecting part for arranging the semicircular metal pointer 6 is arranged on the metering mechanism 2;
the non-magnetic PCB base 3 is used for supporting the non-magnetic detection coil 7 and the non-magnetic PCB 8;
the distance adjusting mechanism 4 is used for adjusting the relative distance between the non-magnetic PCB base 3 and the metering mechanism 2 so as to measure the optimal detection distance;
a frame 5 including a base 51;
the rotating speed power mechanism 1 is arranged on the base 51, the power output end of the rotating speed power mechanism 1 is connected with the power input end 212 of the metering mechanism 2, and the nonmagnetic PCB base 3, the metering mechanism 2 and the rotating speed power mechanism 1 are sequentially arranged from top to bottom; the accuracy of the non-magnetic induction component is verified by comparing the rotating speed metering value of the metering mechanism 2 with the rotating speed induction value induced by the non-magnetic detection coil 7; the non-magnetic water meter calibration device can provide a basis for the optimal design and production and manufacturing of the non-magnetic water meter by adjusting the relative distance between the non-magnetic PCB base 3 and the metering mechanism 2 to obtain the optimal detection distance. Specifically, when the device is used, firstly, a semicircular metal pointer 6 of a nonmagnetic induction component to be detected is installed on an installation part of a metering mechanism 2, then a nonmagnetic detection coil 7 of the nonmagnetic induction component and a nonmagnetic PCB 8 arranged above the nonmagnetic detection coil are fixed on a nonmagnetic PCB base 3, a rotating speed power mechanism 1 is started, the distance between the semicircular metal pointer 6 and the nonmagnetic detection coil 7 is adjusted through a distance adjusting mechanism 4, the metered rotating speed reading value of the metering mechanism 2 at each distance and the rotating speed value sensed by the nonmagnetic induction component are recorded, the difference between the two is compared, so that the induction value of the nonmagnetic induction component at which distance is more accurate is judged, and the proper distance is obtained; in addition, the accuracy of the induced rotating speed value of the non-magnetic induction component under different rotating speeds can be detected, so that the flow speed application range of the non-magnetic induction component can be obtained.
As a preferred embodiment, referring to fig. 1 and 2, the rotational speed power mechanism 1 includes a driving motor 11 and a shaft sleeve 12, a tail portion of the driving motor 11 is connected to the base 51 and is in a vertically upward state, the driving motor 11 is connected to a power input end 212 of the metering mechanism 2 through the shaft sleeve 12, in this embodiment, the power input end of the metering mechanism 2 is actually an overhanging stub shaft, and the shaft sleeve 12 is a coupling for transmitting a torque of the driving motor 11 to the stub shaft of the metering mechanism 2.
As a preferred embodiment, the rotating speed power mechanism 1 further includes a power switch 13, a speed regulating switch 14 and a rotating speed display 15 respectively disposed on the base 51, and the power switch 13 and the speed regulating switch 14 are both electrically connected to the driving motor 11, the power switch 13 is used for controlling the start of the driving motor 11, the speed regulating switch 14 is used for adjusting the rotating speed of the driving motor 11, and the rotating speed display 15 is used for displaying the actual rotating speed sensed by the magnetic pointer.
As a preferred embodiment, referring to fig. 3-6, the metering mechanism 2 includes a gear rib position counting mechanism 21, a turbine carry counting mechanism 22 and a character wheel carry counting mechanism 23, and the gear rib position counting mechanism 21 includes a gear assembly 211 connected in sequence in a transmission manner; the print wheel carrying mechanism comprises a print wheel assembly 231, an axle 232, a roller assembly 233 and a turbine disc 234, wherein the print wheel assembly 231 and the turbine disc 234 are respectively arranged on the axle 232, and the roller assembly 233 can drive the print wheel of the print wheel assembly 231 to carry in a rotating way through the axle 232; the turbine carry counting mechanism 22 is arranged between the character wheel carry counting mechanism 23 and the gear rib position counting mechanism 21, the turbine carry counting mechanism 22 comprises a worm wheel 221, the worm wheel 221 comprises a worm wheel portion 2211 and a lower gear 2212 arranged at the lower end of the worm wheel portion 2211, the worm wheel portion 2211 is meshed with the turbine disk 234 on the wheel shaft 232 to drive the one position on the character wheel assembly 231 to rotate, and the lower gear 2212 is meshed with the gear assembly 211 in the gear rib position counting mechanism 21. Specifically, the gear assembly 211 comprises a main drive gear set and a variable ratio gear set, the main drive gear set is in transmission connection with the variable ratio gear set, the main drive gear set comprises a power gear, the power gear is arranged on a short shaft, and the short shaft is connected with the drive motor 11 through a shaft sleeve 12 to transmit power for simulating the rotating speed of a drive impeller of water flow; the variable ratio gear set obtains flow counts of different orders of magnitude through different transmission ratios, in the embodiment, the variable ratio gear set of ten-liter position count g, hundred-liter position count f and tonnage count e is sequentially arranged, correspondingly, a counting pointer is arranged on one gear of the corresponding variable ratio gear set, the variable ratio gear set of the tonnage count e is transmitted to the character wheel carry counting mechanism 23 through the worm wheel 221, and tonnage d count, ten-tonnage c count, hundred-tonnage b count and kiloton position a count can be sequentially completed through the character wheel assembly 231 and the gear wheel assembly 233.
As a preferred embodiment, referring to fig. 4, a connecting portion for connecting the semicircular metal pointer 6 is disposed on any one gear shaft 232 of the gear assembly 211, and the rotating gear shaft 232 can drive the semicircular metal pointer 6 to rotate, so that a potential change of the nonmagnetic PCB board 8 corresponding to the semicircular metal pointer 6 is caused, and the metering of the nonmagnetic water meter can be realized by the number of times of the distance electromotive force change due to the semicircular pointer.
As a preferred embodiment, with reference to fig. 6, the metering mechanism 2 further comprises a metering base 24 and a metering cover 25, the gear rib position counting mechanism 21, the turbine carry counting mechanism 22 and the character wheel carry counting mechanism 23 are all arranged on a metering base 24, the metering cover 25 is covered on the gear rib position counting mechanism 21, the turbine carry counting mechanism 22 and the character wheel carry counting mechanism 23, a dial and a through hole for the counting pointer to pass through are arranged on the metering cover 25, thus, by means of the metering cap 25, the flow values of the ten liter count g, the hundred liter count f and the tonnage count e can be observed and read respectively by means of the counting hands, in the present embodiment, a corresponding dial is also provided at the mounting position of the measuring cover 25 corresponding to the semicircular metal pointer 6, and the semicircular metal pointer elevation count h can be observed and read by the measuring cover 25.
As a preferred embodiment, referring to fig. 1 and 2, the rack 5 further includes a first vertical support 52, a fixing ring 53 and a second vertical support 54, one end of the first vertical support 52 is connected to the base 51, the other end of the first vertical support is connected to the fixing ring 53, one end of the second vertical support 54 is connected to the fixing ring 53, and the other end of the second vertical support 54 is connected to the metering base 24, in this embodiment, the metering base 24, the second vertical support 54, the fixing ring 53, the first vertical support 52 and the base 51 are sequentially connected from top to bottom to form a tower structure.
As a preferred embodiment, referring to fig. 2, a threaded hole for mounting the non-magnetic detection coil 7 is formed in the non-magnetic PCB base 3, and the position of the threaded hole vertically corresponds to the position of the metering mechanism 2 provided with the connecting portion for connecting the semicircular metal pointer 6.
As a preferred embodiment, a reading window for reading by the metering mechanism 2 is further opened on the nonmagnetic PCB base 3.
As a preferred embodiment, referring to fig. 2, the distance adjusting mechanism 4 includes adjusting bolts 41 and locking nuts 42, one end of each adjusting bolt 41 is disposed through the nonmagnetic PCB base 3, the other end of each adjusting bolt 41 is in threaded connection with the metering mechanism 2, and the locking nuts 42 are connected with the adjusting bolts 41 and used for locking the current adjusting position.
It should be noted that the nonmagnetic detection coil 7 and the nonmagnetic PCB board 8 are an integral component, and the nonmagnetic PCB board 8 is disposed directly above the nonmagnetic detection coil 7.
The invention simulates the water flow rotating speed through the rotating speed power mechanism 1, the rotating speed power mechanism 1 is connected with the mechanical metering mechanism 2 and can read the water flow metering value, the metering mechanism 2 is provided with a mounting part for mounting the semicircular metal pointer 6 so as to drive the semicircular metal pointer 6 to rotate, correspondingly, a nonmagnetic metering plate (a nonmagnetic detection coil 7 and a nonmagnetic PCB plate 8) is arranged on the nonmagnetic PCB base 3, the water flow is metered by sensing the electromotive force change times of the semicircular metal pointer 6 through the nonmagnetic metering plate, simultaneously, a display on the base 51 can display the metering value measured by the nonmagnetic sensing component, the accuracy of the nonmagnetic metering is verified by comparing the water flow metering value obtained by the mechanical metering mechanism 2 with the metering value measured by the nonmagnetic sensing component, the structure is simple and reliable, the operation is simple, in addition, the invention is provided with the distance adjusting mechanism 4 between the nonmagnetic PCB base 3 and the metering mechanism 2, the distance between no magnetism metering board and no magnetism semicircle pointer can be adjusted in the setting of roll adjustment mechanism 4, combines the accuracy contrast of rivers metering value again to obtain the best detection interval, provide the basis for the design and the manufacturing of no magnetism metering, with the stability that improves the product.
Detailed description of the inventionthe principles and embodiments of the present invention have been described herein using specific examples, which are intended to facilitate an understanding of the methods and core concepts of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
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| CN202011246871.3A CN112325995A (en) | 2020-11-10 | 2020-11-10 | A non-magnetic water meter calibration device |
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| CN202011246871.3A CN112325995A (en) | 2020-11-10 | 2020-11-10 | A non-magnetic water meter calibration device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113607247A (en) * | 2021-08-06 | 2021-11-05 | 武汉盛帆电子股份有限公司 | Nonmagnetic metering test device and method |
| CN113884165A (en) * | 2021-06-07 | 2022-01-04 | 杭州绿鲸科技有限公司 | Nonmagnetic metering module performance detection device and implementation method |
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