CN113720419A - Rotatory multidirectional ultrasonic wave level gauge - Google Patents
Rotatory multidirectional ultrasonic wave level gauge Download PDFInfo
- Publication number
- CN113720419A CN113720419A CN202110987648.2A CN202110987648A CN113720419A CN 113720419 A CN113720419 A CN 113720419A CN 202110987648 A CN202110987648 A CN 202110987648A CN 113720419 A CN113720419 A CN 113720419A
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- China
- Prior art keywords
- level gauge
- heat dissipation
- mounting plate
- equipment box
- column
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a rotary multidirectional ultrasonic liquid level meter which comprises a supporting mechanism and a first adjusting mechanism, wherein the supporting mechanism comprises a mounting plate, a connecting piece, a rubber column and a sucker, the connecting piece is symmetrically arranged on the mounting plate, the rubber column is connected to one side of the mounting plate, one end, far away from the mounting plate, of the rubber column is connected with the sucker, the first adjusting mechanism comprises an equipment box, a motor, a rotating shaft and a supporting column, a protective pad is arranged between the equipment box and a heat dissipation mechanism, the motor is arranged in the equipment box, and the rotating shaft is connected with one end of the supporting column. This rotatory multidirectional ultrasonic wave level gauge is provided with motor and electronic flexible post, and the motor can drive support column and second adjustment mechanism and rotate to be convenient for ultrasonic wave level gauge body and sound wave transmitter detect the liquid of device below, and electronic flexible post can promote the rotor plate and rotate simultaneously, thereby be convenient for adjust the measurement position of ultrasonic wave level gauge body and sound wave transmitter.
Description
Technical Field
The invention relates to the technical field of ultrasonic liquid level meters, in particular to a rotary multidirectional ultrasonic liquid level meter.
Background
The ultrasonic level gauge is a digital level gauge controlled by a microprocessor. Ultrasonic pulse sends out by the sensor in measuring, the sound wave is received by same sensor after the liquid surface reflection, convert the signal of telecommunication into through piezoelectric crystal, and calculate the sensor to the distance by the transmission of sound wave and the time between the receipt, the most mounted position of current ultrasonic wave level gauge is fixed, measure the rigidity promptly, thereby inconvenient detect the different positions of liquid, and then measure the deviation easily, and current ultrasonic wave level gauge is installed in the open air mostly, thereby damage because of solarization and rain accident easily, to the above-mentioned problem, need improve current equipment.
Disclosure of Invention
The invention aims to provide a rotary multidirectional ultrasonic liquid level meter, which solves the problems that most of the existing ultrasonic liquid level meters in the background art are fixed in installation position, namely measurement position, so that different positions of liquid are inconvenient to detect, and further, deviation is easy to measure, and most of the existing ultrasonic liquid level meters are installed outdoors, so that the existing ultrasonic liquid level meters are easy to be accidentally damaged due to sun exposure and rain.
In order to achieve the purpose, the invention provides the following technical scheme: a rotary multi-directional ultrasonic liquid level meter comprises a supporting mechanism and a first adjusting mechanism,
the supporting mechanism comprises a mounting plate, a connecting piece, a rubber column and a sucker, the connecting piece is symmetrically arranged on the mounting plate, the top of the mounting plate is connected with a protection mechanism, the rubber column is connected to one side of the mounting plate, one end, far away from the mounting plate, of the rubber column is connected with the sucker, and the rubber column is arranged on the inner side of the connecting piece;
the first adjusting mechanism comprises an equipment box, a motor, a rotating shaft and a supporting column, the equipment box and the heat dissipation mechanism are connected with the other side of the mounting plate, a protection pad is arranged between the equipment box and the heat dissipation mechanism and connected with the mounting plate, the motor is arranged in the equipment box, the output end of the motor penetrates through the equipment box and is connected with the rotating shaft, the rotating shaft is connected with one end of the supporting column, and a side face of the supporting column is connected with a second adjusting mechanism.
Preferably, the rubber columns are uniformly distributed on the mounting plate;
through adopting above-mentioned technical scheme, the rubber column plays the effect of connecting mounting panel and sucking disc.
Preferably, the heat dissipation mechanism comprises a fixing plate, heat dissipation fans, dust screens and screws, the heat dissipation fans are symmetrically arranged on the fixing plate, the dust screens are arranged on the outer sides of the heat dissipation fans, and the dust screens are connected with the fixing plate through the screws;
through adopting above-mentioned technical scheme, be convenient for help motor and sound wave transmitter dispel the heat and dry.
Preferably, the motor, the rotating shaft, the supporting column and the second adjusting mechanism form a rotating structure;
through adopting above-mentioned technical scheme, be convenient for adjust the detection position of ultrasonic wave level gauge body and sound wave transmitter.
Preferably, the rotating shaft is rotatably connected with the equipment box, and the equipment box is provided with heat dissipation holes;
through adopting above-mentioned technical scheme, the louvre is convenient for the heat dissipation fan help the motor heat dissipation in the equipment box.
Preferably, the second adjusting mechanism comprises an electric telescopic column, a spring, a telescopic guide rod, a rotating plate, an electric sliding rail, an electric sliding block, an ultrasonic liquid level meter body and a sound wave emitter, the rotating plate is connected with the support column through the electric telescopic column, the bottom of the rotating plate is connected with the electric sliding rail, the electric sliding block is connected onto the electric sliding rail, the bottom end of the electric sliding block is connected with the ultrasonic liquid level meter body, and the bottom of the ultrasonic liquid level meter body is connected with the sound wave emitter;
through adopting above-mentioned technical scheme, be convenient for improve the flexibility of device and make it detect liquid from a plurality of positions.
Preferably, one side of the electric telescopic column is provided with a spring, and a telescopic guide rod is arranged in the spring;
through adopting above-mentioned technical scheme, be convenient for make the one end of rotor plate rotate.
Preferably, the protection mechanism comprises a rain baffle plate, a solar photovoltaic plate, a rain guide groove, a battery box, a movable plate and a battery pack, the solar photovoltaic plate is arranged at the top of the rain baffle plate, the battery box is connected to the inner top of the rain baffle plate, the battery pack is arranged in the battery box, and the movable plate is connected to one side face of the battery box;
through adopting above-mentioned technical scheme, the staff of being convenient for overhauls the group battery.
Preferably, rain guide grooves are formed in the top of the rain baffle at equal intervals;
through adopting above-mentioned technical scheme, be convenient for promote the rainwater at the flow of weather shield top.
Compared with the prior art, the invention has the beneficial effects that: the rotary multi-directional ultrasonic liquid level meter is provided with a liquid level meter,
(1) the device is provided with the mounting plate, a user can mount and fix the position of the device by using the mounting plate and the connecting piece, and meanwhile, the sucking disc is arranged, so that the sucking disc is convenient for the connection relation between the tightening device and the external supporting device, and the connection stability is improved;
(2) the rain-proof device is provided with the rain-proof plate, so that the rain-proof and sun-shading functions can be achieved, the damage to the device caused by insolation and rain can be reduced, the device can be protected conveniently, the service life of the device can be prolonged, and meanwhile, the rain guide groove is arranged, so that rainwater on the top of the rain-proof plate can be guided conveniently, the rainwater can be prevented from being collected on the top of the rain-proof plate conveniently, and the structure of the device can be optimized conveniently;
(3) the motor can drive the support column and the second adjusting mechanism to rotate, so that the ultrasonic liquid level meter body and the sound wave emitter can conveniently detect liquid below the device, and meanwhile, the electric telescopic column can push the rotating plate to rotate, so that the measuring directions of the ultrasonic liquid level meter body and the sound wave emitter can be conveniently adjusted;
(4) the electric slide block is arranged and can drive the ultrasonic liquid level meter body and the sound wave emitter to move left and right on the electric slide rail, so that the ultrasonic liquid level meter body and the sound wave emitter can conveniently detect different positions of the liquid level, the detection precision is conveniently improved, and the flexibility of the device is conveniently improved;
(5) be provided with the heat dissipation fan, two sets of heat dissipation fans can be respectively to the motor with rotatory to the left sound wave transmitter of protection pad bloies to be convenient for high temperature liquid liquefaction forms the drop of water in sound wave transmitter bottom, and then be convenient for guarantee the normal use of device.
Drawings
FIG. 1 is a schematic top sectional view of the present invention;
FIG. 2 is a schematic front view of the present invention;
FIG. 3 is a schematic cross-sectional front view of the present invention;
FIG. 4 is a schematic diagram of a side view structure of a connection relationship among the rotating plate, the electric slide rail, the electric slide block, the ultrasonic level gauge body and the acoustic wave transmitter according to the present invention;
FIG. 5 is an enlarged view of the structure at A in FIG. 1 according to the present invention;
fig. 6 is a schematic view of the structure of the rain guide groove and the solar photovoltaic panel of the present invention, which are distributed at the top of the rain shield.
In the figure: 1. the device comprises a supporting mechanism, 101, a mounting plate, 102, a connecting piece, 103, a rubber column, 104, a sucker, 2, a heat dissipation mechanism, 201, a fixing plate, 202, a heat dissipation fan, 203, a dust screen, 204, a screw, 3, a first adjusting mechanism, 301, an equipment box, 302, a motor, 303, a rotating shaft, 304, a supporting column, 4, a second adjusting mechanism, 401, an electric telescopic column, 402, a spring, 403, a telescopic guide rod, 404, a rotating plate, 405, an electric sliding rail, 406, an electric sliding block, 407, an ultrasonic liquid level meter body, 408, a sound wave emitter, 5, a protection mechanism, 501, a rain baffle, 502, a solar photovoltaic panel, 503, a rain guide groove, 504, a battery box, 505, a movable plate, 507, a battery pack, 6 and a protection pad.
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.
Referring to fig. 1-6, the present invention provides a technical solution: a rotary multi-directional ultrasonic liquid level meter is disclosed, as shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 6, a supporting mechanism 1 comprises a mounting plate 101, a connecting piece 102, a rubber column 103 and a suction cup 104, the connecting piece 102 is symmetrically arranged on the mounting plate 101, meanwhile, the top of the mounting plate 101 is connected with a protection mechanism 5, the protection mechanism 5 comprises a rain shield 501, a solar photovoltaic panel 502, a rain guide groove 503, a battery box 504, a movable plate 505 and a battery pack 507, the solar photovoltaic panel 502 is arranged on the top of the rain shield 501, the solar photovoltaic panel 502 can convert solar energy into electric energy and store the electric energy into the battery pack 507 to provide electric power for the device, the rain guide grooves 503 are arranged on the top of the rain shield 501 at equal intervals, the rain guide groove 503 is convenient for preventing rainwater from gathering on the top of the rain shield 501, the battery box 504 is connected on the inner top of the rain shield 501, the battery pack 507 is arranged in the battery box 504, the movable plate 505 is connected on one side of the battery box 504, when the battery pack 507 has a fault, a worker can overhaul and replace the battery pack by detaching the movable plate 505, the detaching process is simple, one side of the mounting plate 101 is connected with the rubber column 103, one end of the rubber column 103, far away from the mounting plate 101, is connected with the suction cup 104, the rubber column 103 is uniformly distributed on the mounting plate 101, the rubber column 103 can deform and contract when the surface of the supporting device is uneven, so that the structure of the device is optimized, different mounting requirements are met, meanwhile, the rubber column 103 is arranged on the inner side of the connecting piece 102, the first adjusting mechanism 3 comprises an equipment box 301, a motor 302, a rotating shaft 303 and a supporting column 304, the equipment box 301 and the heat dissipation mechanism 2 are both connected with the other side of the mounting plate 101, the heat dissipation mechanism 2 comprises a fixing plate 201, a heat dissipation fan 202, a dust screen 203 and screws 204, the heat dissipation fan 202 is symmetrically arranged on the fixing plate 201, the dust screen 203 is arranged on the outer side of the heat dissipation fan 202, simultaneously dust screen 203 passes through screw 204 and is connected with fixed plate 201, dust screen 203 is convenient for blow to motor 302 and the wind of sound wave transmitter 408 to heat dissipation fan 202 and filters the edulcoration, thereby be convenient for prevent that the pollutant from polluting sound wave transmitter 408 and motor 302, be provided with between equipment box 301 and the heat dissipation mechanism 2 and protect and fill up 6, and the protection is filled up 6 and is connected with mounting panel 101, the protection is filled up 6 and is convenient for prevent that sound wave transmitter 408 from producing the friction with mounting panel 101 at the in-process of adjusting, and then the sound wave transmitter 408 of being convenient for is protected.
As shown in fig. 1, 2, 4 and 5, a motor 302 is disposed in an equipment box 301, a rotating shaft 303 is rotatably connected to the equipment box 301, heat dissipation holes are formed in the equipment box 301, the heat dissipation holes facilitate air circulation inside and outside the equipment box 301, an output end of the motor 302 penetrates through the equipment box 301 and is connected to the rotating shaft 303, the rotating shaft 303 is connected to one end of a supporting column 304, a side surface of the supporting column 304 is connected to a second adjusting mechanism 4, the motor 302, the rotating shaft 303, the supporting column 304 and the second adjusting mechanism 4 form a rotating structure, the motor 302 is convenient to adjust the position of the second adjusting mechanism 4, the second adjusting mechanism 4 includes an electric telescopic column 401, a spring 402, a telescopic guide rod 403, a rotating plate 404, an electric slide rail 405, an electric slider 406, an ultrasonic level gauge body 407 and an acoustic wave transmitter 408, and the rotating plate 404 is connected to the supporting column 304 through the electric telescopic column 401, one side of electronic flexible post 401 is provided with spring 402, and the inside of spring 402 is provided with flexible guide arm 403, spring 402 and flexible guide arm 403 can stretch the pivoted in-process at rotor plate 404 and contract, thereby be convenient for provide stable support for it, the bottom of rotor plate 404 is connected with electronic slide rail 405, and be connected with electronic slider 406 on the electronic slide rail 405, the bottom of electronic slider 406 is connected with ultrasonic wave level gauge body 407, and the bottom of ultrasonic wave level gauge body 407 is connected with sound wave transmitter 408.
The working principle is as follows: when the rotary multidirectional ultrasonic liquid level meter is used, firstly, the position of the device is fixed by using the connecting piece 102 on the mounting plate 101, then, a power supply starting device is connected, the motor 302 drives the rotating shaft 303 to rotate through the rotating shaft 303 until the ultrasonic liquid level meter body 407 and the acoustic wave emitter 408 are in a vertically downward state, the ultrasonic liquid level meter body 407 and the acoustic wave emitter 408 detect the liquid below, when the detection position needs to be adjusted, a worker can control the electric telescopic column 401 to push the rotating plate 404 to rotate and extend towards the rear side, so that the detection positions of the ultrasonic liquid level meter body 407 and the acoustic wave emitter 408 can be adjusted, meanwhile, the worker can control the electric slide block 406 to drive the ultrasonic liquid level meter body 407 and the acoustic wave emitter 408 to move back and forth on the electric slide rail 405 according to the detection requirements, namely, the liquid is detected at different positions, after the detection is completed, the electric telescopic column 401 drives the ultrasonic liquid level meter body 407 and the sound wave emitter 408 to reset, the motor 302 drives the rotating shaft 303 to rotate through the rotating shaft 303 to reset, and then the two sets of heat dissipation fans 202 respectively blow air to the motor 302 and the sound wave emitter 408, so that heat dissipation and drying of the ultrasonic liquid level meter body are facilitated, and all the work is completed.
The terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for simplicity of description only and are not intended to indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operative in a particular orientation, and are not to be considered limiting of the claimed invention.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A rotary multidirectional ultrasonic liquid level meter comprises a supporting mechanism (1) and a first adjusting mechanism (3), and is characterized in that:
the supporting mechanism (1) comprises a mounting plate (101), a connecting piece (102), a rubber column (103) and a sucker (104), the connecting piece (102) is symmetrically arranged on the mounting plate (101), the top of the mounting plate (101) is connected with a protection mechanism (5), the rubber column (103) is connected to one side of the mounting plate (101), one end, far away from the mounting plate (101), of the rubber column (103) is connected with the sucker (104), and the rubber column (103) is arranged on the inner side of the connecting piece (102);
first adjustment mechanism (3) include equipment box (301), motor (302), pivot (303) and support column (304), and equipment box (301) and heat dissipation mechanism (2) all are connected with the opposite side of mounting panel (101), be provided with protection pad (6) between equipment box (301) and heat dissipation mechanism (2), and protection pad (6) are connected with mounting panel (101), be provided with motor (302) in equipment box (301), and the output of motor (302) runs through equipment box (301) and is connected with pivot (303), pivot (303) are connected with the one end of support column (304), and are connected with second adjustment mechanism (4) on the side of support column (304).
2. A rotary multi-directional ultrasonic level gauge according to claim 1, wherein: the rubber columns (103) are uniformly distributed on the mounting plate (101).
3. A rotary multi-directional ultrasonic level gauge according to claim 1, wherein: the heat dissipation mechanism (2) comprises a fixing plate (201), a heat dissipation fan (202), a dust screen (203) and screws (204), the heat dissipation fan (202) is symmetrically arranged on the fixing plate (201), the dust screen (203) is arranged on the outer side of the heat dissipation fan (202), and meanwhile the dust screen (203) is connected with the fixing plate (201) through the screws (204).
4. A rotary multi-directional ultrasonic level gauge according to claim 1, wherein: the motor (302), the rotating shaft (303), the supporting column (304) and the second adjusting mechanism (4) form a rotating structure.
5. A rotary multi-directional ultrasonic level gauge according to claim 1, wherein: the rotating shaft (303) is rotatably connected with the equipment box (301), and the equipment box (301) is provided with heat dissipation holes.
6. A rotary multi-directional ultrasonic level gauge according to claim 1, wherein: second adjustment mechanism (4) are including electronic flexible post (401), spring (402), flexible guide arm (403), rotor plate (404), electronic slide rail (405), electronic slider (406), ultrasonic wave level gauge body (407) and sound wave transmitter (408), and rotor plate (404) are connected with support column (304) through electronic flexible post (401), the bottom of rotor plate (404) is connected with electronic slide rail (405), and is connected with electronic slider (406) on electronic slide rail (405), the bottom of electronic slider (406) is connected with ultrasonic wave level gauge body (407), and the bottom of ultrasonic wave level gauge body (407) is connected with sound wave transmitter (408).
7. A rotary multi-directional ultrasonic level gauge according to claim 6, wherein: one side of the electric telescopic column (401) is provided with a spring (402), and a telescopic guide rod (403) is arranged inside the spring (402).
8. A rotary multi-directional ultrasonic level gauge according to claim 1, wherein: protection machanism (5) are including weather shield (501), solar photovoltaic board (502), rain guide groove (503), battery box (504), fly leaf (505) and group battery (507), and weather shield (501) top is provided with solar photovoltaic board (502), the interior top of weather shield (501) is connected with battery box (504), and is provided with group battery (507) in battery box (504), be connected with fly leaf (505) on the side of battery box (504).
9. A rotary multi-directional ultrasonic level gauge according to claim 8, wherein: rain guide grooves (503) are formed in the top of the rain blocking plate (501) at equal intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110987648.2A CN113720419A (en) | 2021-08-26 | 2021-08-26 | Rotatory multidirectional ultrasonic wave level gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110987648.2A CN113720419A (en) | 2021-08-26 | 2021-08-26 | Rotatory multidirectional ultrasonic wave level gauge |
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| Publication Number | Publication Date |
|---|---|
| CN113720419A true CN113720419A (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110987648.2A Pending CN113720419A (en) | 2021-08-26 | 2021-08-26 | Rotatory multidirectional ultrasonic wave level gauge |
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| Country | Link |
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| CN (1) | CN113720419A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116222711A (en) * | 2023-03-14 | 2023-06-06 | 东营市工业产品检验与计量检定中心 | A detection device for measuring instruments and equipment |
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| CN209910783U (en) * | 2019-06-17 | 2020-01-07 | 河南福瑞德仪表有限公司 | Ultrasonic liquid level meter with protection device |
| CN212604604U (en) * | 2020-07-14 | 2021-02-26 | 漯河职业技术学院 | Artificial intelligence fills electric pile |
| CN213691331U (en) * | 2020-12-18 | 2021-07-13 | 惠州市星火实业有限公司 | Advertisement structure with luminous character |
| CN213748590U (en) * | 2020-12-22 | 2021-07-20 | 江苏奥坤仪表科技有限公司 | An ultrasonic liquid level gauge that is easy to store |
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2021
- 2021-08-26 CN CN202110987648.2A patent/CN113720419A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202882187U (en) * | 2012-10-18 | 2013-04-17 | 俞越宸 | Station lamination canopy |
| CN104453289A (en) * | 2014-11-28 | 2015-03-25 | 重庆广建装饰股份有限公司 | Intelligent bus stop rainshed |
| CN104453118A (en) * | 2014-11-28 | 2015-03-25 | 重庆广建装饰股份有限公司 | Intelligent foldable type canopy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116222711A (en) * | 2023-03-14 | 2023-06-06 | 东营市工业产品检验与计量检定中心 | A detection device for measuring instruments and equipment |
| CN116222711B (en) * | 2023-03-14 | 2024-07-16 | 东营市工业产品检验与计量检定中心 | A detection device for measuring instrument equipment |
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Application publication date: 20211130 |