CN210571930U - Air chamber with stable light path system and measuring instrument thereof - Google Patents
Air chamber with stable light path system and measuring instrument thereof Download PDFInfo
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- CN210571930U CN210571930U CN201921429975.0U CN201921429975U CN210571930U CN 210571930 U CN210571930 U CN 210571930U CN 201921429975 U CN201921429975 U CN 201921429975U CN 210571930 U CN210571930 U CN 210571930U
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Abstract
The utility model provides an air chamber and measuring apparatu that optical path system is stable, the air chamber includes the vacuum insulation pipe, sets up at the inside inner tube of vacuum insulation pipe, inner tube both ends welded inner tube front end flange, inner tube rear end flange, installs the angle cone prism in the inner tube front end flange, installs the collimation lens in the inner tube rear end flange, still install the wedge mirror in the inner tube front end flange, and the wedge mirror is close to inner tube one side, the wedge mirror is the thin double wedge in thick both sides in middle. The gas chamber is installed to the measuring apparatu. The optical paths of the air chamber and the measuring instrument are insensitive to the deformation of the sampling tube, the stability is very high, and the failure rate of the optical path is reduced. The two filter elements are taken down during installation or debugging and maintenance, so that the light energy entering the spectrometer can be adjusted through the rotary adjusting assembly, the air chamber does not need to be disassembled, and the problem of difficulty in maintaining the heat-humidity ultraviolet flue gas analyzer is completely solved.
Description
Technical Field
The utility model belongs to the technical field of the flue gas detects, concretely relates to stable air chamber of light path system and measuring apparatu thereof.
Background
At present, the monitoring of the emission of the flue gas requires measuring SO in the flue gas2、NO、NO2And the concentration of the pollutants can be measured by adopting an ultraviolet absorption method. The ultraviolet absorption method is generally used for measuring the pollutant concentration in the flue gas by a hot wet method and a cold dry method. Wherein the hot wet method does not need dehumidification, and can avoid SO in the condensation process2、NH3The components which are easy to dissolve in water are dissolved and lost, and the air chamber can be arranged in the sampling tube to be designed into a structure integrating the sampling tube and the host machine, so that the portable smoke analyzer is convenient to carry, and is more suitable for portable smoke analyzers. However, in the process of measuring smoke components by a heat-moisture method, the gas chamber is often in the process of repeatedly and alternately changing from the ambient temperature to over 120 ℃, and higher requirements are put forward on the stability of the light path of the gas chamber. The air chamber structure ubiquitous poor shortcoming of stability of current hot wet process flue gas analysis appearance receives the influence of air chamber structure in the great degree of the optical signal that photoelectric sensor received, has slight deformation when the air chamber structure, will cause the light energy of receiving to take place great change, has seriously influenced the reliability of hot wet process flue gas measurement mode. In addition, the air chamber is located in the sampling tube, the defect of high difficulty in the maintenance process is also existed, after the air chamber is required to be detached from the sampling tube, the optical system can be wiped and maintained, and the optical path is required to be readjusted after the completion. Therefore, the current hot wet flue gas analyzer generally has the defects of short maintenance period and high maintenance difficulty.
Chinese patent No.: 201621006601.4, the patent document entitled "measuring gas cell and ultraviolet flue gas analyzer equipped with the same" provides a gas cell for measuring the concentration of flue gas pollutants by thermal and wet methods and an ultraviolet flue gas analyzer equipped with the same. The measurement air chamber adopts Y-shaped branched optical fibers, wherein one optical fiber is connected with a light source and called as a transmitting optical fiber, the other optical fiber is connected with a spectrometer and called as a receiving optical fiber, and a public end is connected with the air chamber. The transmitting optical fiber in the optical fiber connected with the air chamber transmits ultraviolet light, enters the air chamber after passing through the lens, is projected on the reflector at the other end of the air chamber and then reflected back to the lens, is converged by the lens and then reaches the end part of the other optical fiber, and then reaches the spectrometer through the receiving optical fiber. Slight variations in the lens and mirror angles of the structure result in large variations in the light energy returned to the end of the receiving fiber. And the air chamber is often high low temperature alternation, and the instrument is also often carried, especially moves to on the sampling monitoring platform of tens meters height, and the stability of the mechanical structure of air chamber is hardly guaranteed, therefore the needs of portable ultraviolet flue gas sampling can't be satisfied to this scheme.
Chinese patent No.: 201220570891.0, patent document entitled "cube-corner prism-based flue gas analyzer" also provides a flue gas analyzer that measures the concentration of flue gas pollutants using a thermal-wet method. The flue gas analyzer comprises a light source, a spectrometer, Y-shaped optical fibers and an air chamber, wherein three branches of the Y-shaped optical fibers are respectively connected with one ends of the light source, the spectrometer and the air chamber, a collimating lens is installed at one end, connected with the branches of the Y-shaped optical fibers, in the air chamber, a pyramid prism is installed at the other end of the air chamber, and an air inlet and an air outlet are formed in the outer wall of the middle part of the air chamber. The axis of the pyramid prism and the axis of the collimating lens are located on the same straight line. The light path of the structure returns according to the original light path, so that only a small amount of light energy reaches a receiving end, namely a spectrometer, the practical application value is not high, and the requirement of portable ultraviolet smoke sampling cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a stable air chamber of optical path system and measuring apparatu thereof, the unstable influence measurement reliability of optical path system who overcomes current hot wet flue gas analysis appearance existence to and the difficult scheduling problem is maintained to the analysis appearance.
The utility model provides an air chamber, including the vacuum insulation pipe, set up at the inside inner tube of vacuum insulation pipe, inner tube both ends welded inner tube front end flange, inner tube rear end flange, the interior pipe front end flange is the installation angle cone prism, installs the collimation lens in the inner tube rear end flange, on prior art's basis, the utility model discloses further make the improvement: the wedge-shaped mirror is further installed in the flange at the front end of the inner pipe, the wedge-shaped mirror is close to one side of the inner pipe, and the wedge-shaped mirror is double wedge-shaped, wherein the middle of the wedge-shaped mirror is thick, and the two sides of the wedge-shaped mirror are thin.
The optical fiber is arranged on the air chamber at one end of the collimating lens, incident light emitted from the end part of the transmitting optical fiber becomes parallel light forming an included angle with a main optical axis of the collimating lens after passing through the collimating lens, and the transmitting optical fiber deviates from the main optical axis because optical fiber heads of the transmitting optical fiber and the receiving optical fiber are parallel and symmetrical about the main optical axis, and the parallel light of the incident light after passing through the collimating lens forms an included angle with the main optical axis.
The parallel light that the incident light formed behind the collimating lens becomes the light parallel with collimating lens primary optical axis behind the wedge mirror, and the wedge mirror is middle thick, and the both sides are thin about centrosymmetric double wedge transparent melting quartz, and emergent light can deflect to the primary optical axis after the parallel light incidence, and the angle of deflecting is relevant with the apex angle and the refracting index of wedge mirror, the utility model relates to a wedge mirror just in time makes emergent light become the light parallel with the primary optical axis after the parallel light incidence.
After parallel light emitted by the wedge-shaped mirror is reflected by the pyramid prism, emergent light and incident light deflect 180 degrees and then are converged to the end part of the receiving optical fiber through the wedge-shaped mirror and the collimating lens in sequence. According to the characteristic of pyramid prism, the emergent light of incident light after the three plane of reflection of pyramid prism is 180 with the incident light, emergent light is parallel with the incident light, because the wedge mirror is double wedge, parallel emergent light can deflect to the primary optical axis behind the wedge mirror, the light that also is the return stroke still can keep an contained angle with the primary optical axis, this contained angle and the incident light that the transmission fiber tip sent are with the same angle of contained angle that the primary optical axis formed behind the collimating lens, receive the light energy that the fiber tip just in time converged and reflect back.
Because the deflection angle of the wedge-shaped mirror is basically unchanged when the incident angle is slightly changed, and the pyramid prism always deflects the incident light by 180 degrees, the air chamber is insensitive to the installation angles of the wedge-shaped mirror and the pyramid prism, the structure of the air chamber is slightly deformed, so that when the angles of the wedge-shaped mirror and the pyramid prism are changed to a certain degree, the light energy received by the receiving optical fiber is basically unchanged, and the air chamber has extremely high stability.
Preferably, still include the adjusting part that is used for adjusting pyramid prism, wedge mirror, the adjusting part sets up inside inner tube front end flange, including fixed section of thick bamboo, cover, cushion, fixed section of thick bamboo has open-ended drum structure for both ends, wedge mirror apex one side top is in the inside one end of fixed section of thick bamboo, pyramid prism's incident plane next-door neighbour wedge mirror opposite side, pyramid prism's plane of reflection one end withstands the cushion, the cover withstands the cushion and is connected with fixed section of thick bamboo. During maintenance, for example, the pyramid prism and the wedge-shaped mirror need to be wiped, only the barrel cover needs to be unscrewed, the whole adjusting component can be detached, and when the angles of the pyramid prism and the wedge-shaped mirror are adjusted, only the adjusting component needs to be rotated. The reflecting surface of the pyramid prism is three mutually perpendicular surfaces, and the incident surface is the utility model is used as the surface for light incidence and outgoing, also can be called as the outgoing surface.
Preferably, the other end of the front end flange of the inner pipe is welded with the front end flange of the outer pipe.
Preferably, still include the one-level filter core, the second grade filter core that are used for filtering the flue gas, the second grade filter core sets up in inner tube front end flange, the setting of one-level filter core next to the second grade filter core is in outward appearance front end flange. And secondary filtration is carried out, so that the measurement precision is ensured.
Preferably, the filter element pressing cap is further included, and the filter element pressing cap is pressed against the first-stage filter element and the second-stage filter element to be fixed with the flange at the front end of the outer tube. When the pyramid prism and the wedge-shaped mirror need to be maintained, only the filter element pressing cap needs to be dismounted, and the primary filter element and the secondary filter element are taken out.
Preferably, the collimating lens is fixed by a lens fixing cylinder at a flange at the rear end of the inner tube.
Preferably, the lens fixing device further comprises an optical fiber connector, wherein one end of the optical fiber connector is sleeved outside the lens fixing barrel, and the other end of the optical fiber connector extends out of the vacuum heat insulation pipe.
Preferably, the gas outlet nozzle is further included and is fixed on the flange at the rear end of the inner pipe and communicated with the inside of the inner pipe.
Preferably, an air guide groove is formed in the inner wall of the flange at the front end of the inner pipe and communicated with the inside of the inner pipe.
The utility model also provides a measuring apparatu, foretell air chamber is installed to the measuring apparatu.
The utility model has the advantages that:
1. the utility model discloses a light that method transmission fiber end portion sent becomes the parallel light through collimating lens after, as long as can shine on the pyramid prism, can guarantee that the light that returns gets back to and receives the fiber end portion, very big improvement heat wet method optical path system's stability, the air chamber based on this method principle design, the light path of measuring apparatu is insensitive to sampling tube deformation, stability is very high, has reduced the light path fault rate;
2. the two filter elements are taken down during installation or debugging and maintenance, so that the light energy entering the spectrometer can be adjusted through the rotary adjusting assembly, the air chamber does not need to be disassembled, and the problem of difficulty in maintaining the heat-humidity ultraviolet flue gas analyzer is completely solved.
3. When the surface of the optical part is dirty due to contact with smoke and needs to be cleaned, the pyramid incident surface can be cleaned only by taking down the two filter elements and the adjusting component from the front end; the collimating lens can adopt a long rod with absorbent cotton or lens paper at the front end, and is wiped by alcohol, and the collimating lens is assembled according to the original shape after being wiped, and only the received optical signal needs to be adjusted to the required strength through a rotary adjusting component.
Drawings
FIG. 1 is a schematic diagram of the optical path system of the air chamber of the present invention,
FIG. 2 is a schematic view of the structure of the air chamber of the present invention,
FIG. 3 is a schematic structural diagram of the wedge-shaped mirror of the present invention,
FIG. 4 is a schematic structural view of the front end flange of the inner tube of the present invention,
FIG. 5 is a schematic structural view of the rear end flange of the inner tube of the present invention,
figure 6 is an exploded view of the adjustment assembly of the present invention,
FIG. 7 is a schematic diagram of the external structure of the measuring instrument of the present invention,
fig. 8 is a schematic view of the internal structure of the measuring instrument of the present invention.
The attached drawings are marked as follows:
1. vacuum heat insulation pipe, 2, inner pipe, 3, inner pipe front end flange, 31, air guide groove, 4, inner pipe rear end flange, 41, fastening screw hole, 42, air outlet hole, 5, pyramid prism, 6, collimating lens, 7, wedge lens, 8, Y-shaped optical fiber, 9, adjusting component, 91, fixing cylinder, 92, cylinder cover, 93, rubber pad, 94, first O-ring, 95, second O-ring, 96, third O-ring, 10, outer pipe front end flange, 11, primary filter core, 12, secondary filter, 13, filter core pressing cap, 14, primary filter core rubber pad, 15, lens fixing cylinder, 16, optical fiber joint, 17, air outlet nozzle, 18, air chamber, 19, rubber ring, 20, mainframe box, 21, air chamber adapter tube, 22, handle, 23, display screen, 24, power supply interface, 25, data interface, 26, sampling pump, 27, spectrometer, 28, industrial personal computer, 29, pulse xenon lamp, 30. electrochemical sensor subassembly, 31, peristaltic pump, 32, condensation dewatering subassembly, 33, lower computer circuit board.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the scope of the invention.
Examples
Referring to fig. 1, the air chamber of this embodiment includes vacuum insulation pipe 1, sets up at the inside inner tube 2 of vacuum insulation pipe 1, inner tube 2 both ends welded inner tube front end flange 3, inner tube rear end flange 4, installs pyramid prism 5 in the inner tube front end flange 3, installs collimating lens 6 in the inner tube rear end flange 4, still install wedge mirror 7 in the inner tube front end flange 3, and wedge mirror 7 is close to inner tube 2 one side, refers to fig. 3, wedge mirror 7 is the thin circular double wedge transparent fused quartz material in thick both sides in the middle. The Y-shaped optical fiber 8 is mounted on the air chamber at one end of the collimating lens 6. The inner pipe front end flange 3 is shown in fig. 4, the inner pipe front end flange 3 is provided with an air guide groove 31, the inner pipe rear end flange 4 is shown in fig. 5, and the inner pipe rear end flange 4 is provided with a fastening screw hole 41 and an air outlet hole 42.
The center distance between the transmitting optical fiber and the receiving optical fiber of the Y-shaped optical fiber 8 used in this embodiment is 0.4mm, the focal length of the collimating lens 6 is 20mm, the refractive index of the wedge-shaped mirror 7 is 1.5, and the vertex angle of the wedge-shaped mirror in this embodiment is 1.15 ° according to the vertex angle formula of the wedge-shaped mirror 7.
The derivation process of the wedge-shaped mirror vertex angle is as follows:
incident light emitted by the end part of the emission optical fiber becomes parallel light forming an included angle with the main optical axis of the collimating lens 6 after passing through the collimating lens 6, and the included angle between the parallel light and the main optical axis of the collimating lens 6 is
Wherein the center distance between the transmitting optical fiber and the receiving optical fiber is LFiberThe focal length of the collimating lens 6 is f';
the approximate formula of the deflection angle of the wedge-shaped mirror 7 is that theta is (n-1) α, wherein n is the refractive index of the optical wedge medium, α is the apex angle of the optical wedge,
the light is converted into light parallel to the main optical axis of the collimating lens 6 by the wedge-shaped mirror 7, and the deviation angle is equal to
Then
The apex angle of the wedge-shaped mirror 7 is:
referring to fig. 2, the incident light emitted from the end of the emitting fiber of the Y-shaped fiber 8 passes through the collimating lens 6 and then becomes parallel light forming an included angle with the main optical axis of the collimating lens 6, that is, the light rays of the light group a and the light group b are parallel to each other, in the figure, there are two light rays in the light group a and the light group b respectively, because the distance between the light rays is very small, therefore, the parallel light is overlapped in the figure, becomes the light parallel to the main optical axis of the collimating lens 6 after passing through the wedge-shaped mirror 7, the collimating lens 6, the wedge-shaped mirror 7 and the main optical axis of the pyramid prism 5 are coaxial, after the parallel light is reflected by the pyramid prism 5, emergent light and incident light deflect 180 degrees and then sequentially pass through the wedge-shaped mirror 7 and the collimating lens 5 to be converged to the end part of the receiving optical fiber, namely, the light group c is the light reflected by the light group a, the light group d is the light reflected by the light group b, and the light of the light group c and the light of the light group d are finally converged to the receiving optical fiber.
By adopting the air chamber designed by the embodiment, the light path is not influenced by slight deformation of the structure of the air chamber, the receiving optical fiber almost converges all the emitted light energy, the measurement precision is very high, and the fault is not easy to occur.
In order to facilitate installation and maintenance of the optical component, as a preferred embodiment of this embodiment, the air chamber further includes an adjusting assembly 9 for adjusting the corner cube prism 5 and the wedge mirror 7, referring to fig. 6, the adjusting assembly 9 is disposed inside the inner tube front end flange 3 and includes a fixed cylinder 91, a cylinder cover 92, and a rubber pad 93, the fixed cylinder 91 is a cylinder structure with openings at two ends, one side of a vertex angle of the wedge mirror 7 abuts against one end inside the fixed cylinder 91, an incident surface of the corner cube prism 5 is adjacent to the other side of the wedge mirror 7, one end of a reflecting surface of the corner cube prism 5 abuts against the rubber pad 93, and the cylinder cover 92 abuts against the rubber pad 93 and is connected with the fixed cylinder 91.
Further, in order to increase the air tightness of the adjusting assembly 9, referring to fig. 6, the cylinder cover 92 is sleeved with a first O-ring 94 to ensure that the cylinder cover 92 is tightly combined with the fixed cylinder 91. In order to protect the corner cube 5 and the wedge 7, a second O-ring 95 and a third O-ring 96 are provided on a contact surface between the corner cube 5 and the wedge 7 and a contact surface between the wedge 7 and the fixed cylinder 91, respectively.
Referring to fig. 2, the other end of the inner pipe front end flange 3 of the gas cell of this embodiment is welded with an outer pipe front end flange 10. In order to ensure that the flue gas is effectively filtered and the measurement accuracy is ensured, as a preferred embodiment of the present embodiment, the gas chamber further includes a first-stage filter element 11 and a second-stage filter element 12, the second-stage filter element 12 is disposed in the inner tube front end flange 3, and the first-stage filter element 11 is disposed in the outer tube front end flange 10 next to the second-stage filter element 12. The first grade filter core 11 is the stainless steel sintering filter core piece, second grade is filtered 12 and is the polytetrafluoroethylene material filter core.
In order to facilitate the detachment of the primary filter element 11 and the secondary filter element 12, as a preferred embodiment of this embodiment, the air chamber further includes a filter element pressing cap 13, and the filter element pressing cap 13 abuts against the primary filter element 11 and the secondary filter element 12 and is fixed to the outer tube front end flange 10. In order to increase the air tightness of the air chamber, a primary filter element rubber pad 14 can be arranged between the primary filter element 11 and the filter element pressing cap. When the pyramid 5 and the wedge-shaped mirror 7 need maintenance, only the filter element pressing cap 13 needs to be detached, and the first-stage filter element 11 and the second-stage filter element 12 need to be taken out, without detaching the whole air chamber.
The collimator lens 6 of the present embodiment is fixed to the inner tube rear end flange 4 by the lens fixing cylinder 15. The air chamber of the embodiment further comprises an optical fiber connector 16, wherein one end of the optical fiber connector 16 is sleeved outside the lens fixing barrel 15, and the other end of the optical fiber connector 16 extends out of the vacuum heat insulation pipe 1. The inner pipe rear end flange 4 is further provided with an air outlet nozzle 17, and the air outlet nozzle 17 is communicated with an air outlet hole 42 of the inner pipe rear end flange 4. The optical fiber connector 16 is fixed by a set screw passing through a set screw hole 41 of the inner pipe rear end flange 4.
Referring to fig. 7 and 8, the present embodiment further provides a measuring instrument, the measuring instrument has a main case 20, an air chamber adapter tube 21 is installed on the main case 20, the air chamber adapter tube 21 is connected to the air chamber 18 of the present embodiment, and a handle 22, a display screen 23, a power interface 24, and a data interface 25 are arranged on the main case 20. The mainframe box is internally provided with a sampling pump 26, a spectrometer 27, an industrial personal computer 28, a pulse xenon lamp 29, an electrochemical sensor assembly 30, a peristaltic pump 31, a condensation and water removal assembly 32 and a lower computer circuit board 33. Other structures outside the degassing chamber of the measuring instrument are the prior art, and the connection relationship is not described again.
The measuring apparatu during operation of this embodiment, sampling pump 26 work, make the flue gas press cap 13 from the filter core of air chamber tip through one-level filter core 11, the back is filtered to second grade filter core 12 two-stage, air guide groove 31 from inner tube front end flange 3 enters into inner tube 2 in, and discharge orifice 42 through inner tube rear end flange 4 discharges the air chamber from nozzle 17, nozzle 17 passes through the hose and is connected with condensation dewatering component 32 in the mainframe box 20, cool water of congealing that condensation dewatering component produced, enter into peristaltic pump 31 through the hose and discharge, flue gas after the dewatering enters into behind the sampling pump, the rethread hose enters into electrochemical sensor subassembly 30, discharge through the air duct with electrochemical sensor subassembly 30 intercommunication at last.
Claims (10)
1. The utility model provides an air chamber that optical path system is stable, includes the vacuum insulation pipe, sets up at the inside inner tube of vacuum insulation pipe, inner tube both ends welded inner tube front end flange, inner tube rear end flange, installs the pyramid prism in the inner tube front end flange, installs the collimation lens in the inner tube rear end flange, its characterized in that: the wedge-shaped mirror is further installed in the flange at the front end of the inner pipe, the wedge-shaped mirror is close to one side of the inner pipe, and the wedge-shaped mirror is double wedge-shaped, wherein the middle of the wedge-shaped mirror is thick, and the two sides of the wedge-shaped mirror are thin.
2. A gas cell according to claim 1, wherein: still include the adjusting part that is used for adjusting pyramid prism, wedge mirror, the adjusting part sets up inside inner tube front end flange, including solid fixed cylinder, cover, cushion, gu fixed cylinder has open-ended drum structure for both ends, wedge mirror apex one side top is in the inside one end of solid fixed cylinder, pyramid prism's incident plane next-door neighbour wedge mirror opposite side, pyramid prism's plane of reflection one end withstands the cushion, the cover withstands the cushion and is connected with solid fixed cylinder.
3. A gas cell according to claim 1, wherein: and the other end of the inner pipe front end flange is welded with the outer pipe front end flange.
4. A gas cell according to claim 3, wherein: still include one-level filter core, the second grade filter core that is used for filtering the flue gas, the second grade filter core sets up in inner tube front end flange, the next-door neighbour second grade filter core of one-level filter core sets up in outer tube front end flange.
5. A plenum as claimed in claim 4, in which: still press the cap including the filter core, the filter core is pressed the cap and is withstood one-level filter core and second grade filter core and outer tube front end flange fixed.
6. A gas cell according to claim 1, wherein: and the collimating lens is fixed by the lens fixing barrel at the rear end flange of the inner tube.
7. A plenum as claimed in claim 6, wherein: the lens fixing barrel is characterized by further comprising an optical fiber connector, one end of the optical fiber connector is sleeved outside the lens fixing barrel, and the other end of the optical fiber connector extends out of the vacuum heat insulation pipe.
8. A gas cell according to claim 1, wherein: the air outlet nozzle is fixed on the flange at the rear end of the inner tube and communicated with the inside of the inner tube.
9. A gas cell according to claim 1, wherein: and an air guide groove is formed in the inner wall of the flange at the front end of the inner pipe and communicated with the inside of the inner pipe.
10. A surveying instrument, characterized by: the gauge is fitted with a gas cell according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921429975.0U CN210571930U (en) | 2019-08-30 | 2019-08-30 | Air chamber with stable light path system and measuring instrument thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921429975.0U CN210571930U (en) | 2019-08-30 | 2019-08-30 | Air chamber with stable light path system and measuring instrument thereof |
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| CN210571930U true CN210571930U (en) | 2020-05-19 |
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| CN201921429975.0U Active CN210571930U (en) | 2019-08-30 | 2019-08-30 | Air chamber with stable light path system and measuring instrument thereof |
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Address after: 266000 No. 1, Yueyang Road, Chengyang District, Qingdao City, Shandong Patentee after: Qingdao Zhongrui Intelligent Instrument Co.,Ltd. Address before: 266000 No. 1, Yueyang Road, Chengyang District, Qingdao City, Shandong Patentee before: QINGDAO ZHONGRUI INTELLIGENT INSTRUMENT Co.,Ltd. |
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