CN103092222B - A kind of pressure precise adjustment device - Google Patents
A kind of pressure precise adjustment device Download PDFInfo
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- CN103092222B CN103092222B CN201210586305.6A CN201210586305A CN103092222B CN 103092222 B CN103092222 B CN 103092222B CN 201210586305 A CN201210586305 A CN 201210586305A CN 103092222 B CN103092222 B CN 103092222B
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- pressure
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- elastic sensing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The present invention relates to a kind of pressure precise adjustment device, described device comprises: elastic sensing element, elastic deformation conversion equipment, stepper motor and driver, slightly press governor motion, processor, touch-screen, analog-digital converter, pressure transducer, make pressure chamber.The cavity making pressure chamber and elastic sensing element communicates, and inside cavity pressure is equal.Pressure transducer sensitivity makes the pressure in pressure chamber, and the electric signal of output through analog-digital converter collection, then is resolved by processor, obtains real-time force value.Processor is by comparing the error amount of pressure set points and the pressure currency detected in real time inputted by touch-screen, adopt two close cycles PI control algolithm, the thick pressure governor motion first controlling inner ring slightly presses adjustment fast, control the turning to of the stepper motor of outer shroud, angle afterwards, changed the cavity volume of elastic sensing element by elastic deformation conversion equipment, then reach the effect of minute adjustment pressure.Pressure regulation control system precision of the present invention is high, and regulating time is short, with low cost, and applicability is wider.
Description
Technical field
The present invention relates to a kind of industrial control field, be specifically related to a kind of pressure precise adjustment device.
Background technology
Pressure survey occupies critical role in industrial stokehold, and the performance of pressure calibration device determines the calibration accuracy of manometer, efficiency and cost.Full-automatic pressure calibration instrument is high, applied widely because of its precision, and be easy to operation, function i ntegration, the many merits such as compact, just progressively replace traditional piston gage, are widely used in the fields such as electric power, oil, petrochemical industry, metallurgy, pharmacy.
Full-automatic pressure calibration instrument, according to the difference of tested instrument, is mainly divided into air pressure tester and hydraulic pressure tester.Air pressure tester take noncorrosive gases as actuating medium, is often used for calibrating the relatively little manometer of range.Conventional air pressure tester utilizes opening/breaking and controlling to make the air inflow in pressure chamber and air output of solenoid valve, and then reach the object regulating pressure, its structure as shown in Figure 1 C.Hydraulic pressure tester, is often used for calibrating the relatively large manometer of range for actuating medium with non-electrically conductive liquids such as transformer oil, decanedioic acid fat, deionized waters.Conventional hydraulic pressure tester utilizes motor or gas push piston to move in oil cylinder, changes the volume of actuating medium in oil cylinder, then reaches the object regulating pressure, sees Figure 1A and Figure 1B.
At present, the pressure precision of making of Full-automatic pressure calibration instrument is mainly limited by the performance of pressure transducer and topworks.The machining precision of topworks, the consistance of components and parts and processing purchase cost, determine the quality of topworks's performance.
In traditional baric systerm, the response time of solenoid valve, better also wanted 5 ~ 10ms mostly at 10 ~ 30ms, and price costly, and consistance is difficult to ensure.The gas flow of the minimum switch gap of solenoid valve often determines the precision of air pressure adjustment.By reducing the pressure reduction at solenoid valve two ends to reducing the gas flow of minimum switch gap, often increasing the complicacy of system, causing the raising of cost.Reduce the latus rectum of solenoid valve, although the gas flow of minimum switch gap can be reduced, also increase regulating time simultaneously.Increase the volume making pressure cavity, then can because of vessel manufacture, the vibration of aggravation gas, also can increase regulating time.In traditional hydraulic system, for making for pressing system by motor pushing piston, the machining precision of turn-screw can affect the displacement of motor one step lower piston, then affects the resolving power of pressure regulation.And high-precision leading screw is often expensive, not easily process.The stepper motor that motor supporting with it also needs to select high resolving power, torque levels, heating less or servomotor, the cost of further raising system.What push away liquid for gas makes pressing system, then there is a difficult problem similar to baric systerm.
Summary of the invention
In view of this, the object of this invention is to provide a kind of control system utilizing the deformation of elastic sensing element to carry out pressure minute adjustment, to reduce the performance requirement to traditional regulation mechanism, simplied system structure, improved and make pressure precision.
For achieving the above object, present invention employs following technical characteristic:
On the one hand, embodiments provide a kind of pressure precise adjustment device, comprising:
Topworks (1), it comprise elastic sensing element (3), elastic deformation conversion equipment (4), stepper motor and driver (5), slightly press governor motion (6) and make pressure chamber (11), the described cavity making pressure chamber (11) and described elastic sensing element (3) communicates, and inside cavity pressure is equal;
Control gear (2), it comprises processor (7), touch-screen (8), analog-digital converter (9), pressure transducer (10), the pressure in pressure chamber (11) is made described in described pressure transducer (10) sensing, export electric signal, described electric signal is after described analog-digital converter (9) conversion, resolved by described processor (7), after obtaining current pressure values, described processor (7) is by the error amount of the pressure set points that compares user and inputted by described touch-screen (8) and pressure currency, after described error amount is compared with specification error threshold value, double-closed-loop control is carried out to described topworks (1), the pressure in pressure chamber (11) is made described in adjustment.
According to the pressure precise adjustment device described in present pre-ferred embodiments, described double-closed-loop control comprises further:
When error amount is in outside described specification error threshold interval, described processor (7) starts inner ring, controls described thick pressure governor motion (6) and slightly presses adjustment fast;
When described error amount is within described specification error threshold interval, described processor (7) starts outer shroud, control the turning to of described stepper motor and driver (5), angle, changed the cavity volume of described elastic sensing element (3) by described elastic deformation conversion equipment (4), described in regulating, make the pressure of pressing in chamber (11).
According to the pressure precise adjustment device described in present pre-ferred embodiments, when described error amount is within described specification error threshold interval, described processor (7) starts outer shroud, control the turning to of described stepper motor and driver (5), angle, the cavity volume of described elastic sensing element (3) is changed by described elastic deformation conversion equipment (4), described in regulating, make the pressure of pressing in chamber (11), comprise further:
When needing the pressure made described in rising in pressure chamber (11), reduce the cavity volume of described elastic sensing element (3);
When needing the pressure made described in reduction in pressure chamber (11), increase the cavity volume of described elastic sensing element (3).
According to the pressure precise adjustment device described in present pre-ferred embodiments, described elastic sensing element (3) is bourdon tube, corrugated tube or flexible sheet.
According to the pressure precise adjustment device described in present pre-ferred embodiments, described pressure transducer (10) is silicon piezoresistance type pressure sensor, resonance type pressure sensor, capacitance pressure transducer.
According to the pressure precise adjustment device described in present pre-ferred embodiments, described analog-digital converter (9) is ∑-Δ type simulated digital quantizer.
Owing to have employed above technical characteristic, make the present invention compared to prior art, there is following advantage and good effect:
The present invention's advantage is compared with prior art:
(1) the present invention adopts pressure regulating device and the collaborative work of outer shroud elastic sensing element mechanism of inner ring routine, by changing the volume of elastic sensing element cavity, achieving high-precision pressure stability and regulating, being applicable to air pressure and hydraulic pressure two kinds of systems simultaneously;
(2) the present invention adopts two close cycles PI control method, makes slightly to press governor motion and the collaborative work of elastic sensing element mechanism, reaches stable set pressure fast.Namely, when error amount is in outside specification error threshold interval, thick pressure governor motion rapid pressure adjusting is started; When error amount is within specification error threshold interval, starts elastic sensing element mechanism and carry out accurate voltage regulating.In inside and outside two PI links, when error amount is in outside respective specification error threshold interval, governor motion is with the highest governing speed pressure regulation, once error amount enters within specification error threshold interval, then and operation parameter Self-tuning System PI control method pressure regulation.For improving the performance of closed-loop control system, shorten the response time, make to make the set pressure that pressing system reaches stable as early as possible, at inside and outside two rings, according to error amount size, the suitably coefficient of each link of adjustment PI controller, compared to common PI control method, highly shortened the response time, improve antijamming capability;
(3) structure of the present invention is simple, and elastic sensing element mechanism design is flexible, lower to the conventional pressure regulating device manufacturing accuracy coordinated with it, coherence request, also reduces cost simultaneously, has certain marketing potentiality.
Accompanying drawing explanation
Figure 1A is the hydraulic regulator figure utilizing motor pushing piston;
Figure 1B is the hydraulic regulator figure utilizing gas push piston;
Fig. 1 C is the Pneumatic adjusting mechanism figure utilizing solenoid control air inflow, air output;
The structured flowchart of the pressure precise adjustment device that Fig. 2 provides for the embodiment of the present invention;
Fig. 3 A is the schematic diagram of elastic sensing element in an embodiment of the present invention and elastic deformation conversion equipment thereof;
Fig. 3 B is the schematic diagram of elastic sensing element in the another kind of embodiment of the present invention and elastic deformation conversion equipment thereof;
Fig. 4 is processor realization flow figure in the embodiment of the present invention;
Fig. 5 is the principle schematic that in embodiments of the invention, processor adopts parameter self-tuning PI to control.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail.
As shown in Figure 2, a kind of pressure precise adjustment device is embodiments provided, as seen from the figure.Described device comprises:
Topworks (1), it comprise elastic sensing element (3), elastic deformation conversion equipment (4), stepper motor and driver (5), slightly press governor motion (6) and make pressure chamber (11), the described cavity making pressure chamber (11) and described elastic sensing element (3) communicates, and inside cavity pressure is equal;
Control gear (2), it comprises processor (7), touch-screen (8), analog-digital converter (9), pressure transducer (10), the pressure in pressure chamber (11) is made described in described pressure transducer (10) sensing, export electric signal, described electric signal is after described analog-digital converter (9) conversion, resolved by described processor (7), after obtaining current pressure values, described processor (7) is by the error amount of the pressure set points that compares user and inputted by described touch-screen (8) and pressure currency, after described error amount is compared with specification error threshold value, double-closed-loop control is carried out to described topworks (1), the pressure in pressure chamber (11) is made described in adjustment.
More particularly, the embodiment of the present invention provides a kind of device utilizing the deformation of elastic sensing element to carry out pressure minute adjustment, wherein, elastic sensing element 3, elastic deformation conversion equipment 4, stepper motor and driver 5 constitute the accurate voltage regulating topworks of core: as Fig. 3 A, turning to and moment of driver control stepper motor 5, changed the deformation of bourdon tube by deformation conversion equipment, then change the volume of bourdon tube cavity and actuating medium.Motor shaft rotates clockwise, and cavity reduces, then pressure becomes large.Motor shaft rotates counterclockwise, and cavity increases, then pressure diminishes.As Fig. 3 B, driver control stepper motor 5 is pushed away by leading screw or draws moving bar piece, then changes the volume of corrugated tube cavity and actuating medium.When promoting moving bar piece to left movement, corrugated tube is compressed, and cavity reduces, then pressure becomes large.When pulling moving bar piece to move right, corrugated tube is stretched, and cavity increases, then pressure reduces.The control gear of pressure transducer 10, analog-digital converter 9, processor 7 composition, or title control circuit, two close cycles PI control method can be passed through, control thick pressure governor motion 6, control and drive system drives stepper motor 5 simultaneously, the deformation of the elastic sensing element 3 changed, makes the two co-ordination, realizes stable, pressure regulation rapidly.
Elastic sensing element of the present invention can select bourdon tube as shown in Figure 3A, corrugated tube or flexible sheet etc. as shown in Figure 3 B, is aided with simple elastic deformation conversion equipment.Processor 7 can pass through the deformation of stepper motor and driver control elastic sensing element.The cavity volume of elastic sensing element should be coordinated mutually with the whole cumulative volume making hydraulic circuit, and too little then range of regulation is less than normal, does not then have too greatly the effect of accurate voltage regulating.Also to consider the pressure regulation resolving power of thick pressure governor motion simultaneously.
As shown in Figure 4, processor 7 of the present invention receives the pressure set points of user's setting by touch-screen 8, and pressure transducer 10 sensitivity makes the force value in pressure chamber 11, gathers, resolved obtain pressure currency by processor 7 through analog-digital converter 9.
Pressure set points compares with pressure currency by processor 7, obtains error amount.When error amount is in outside specification error threshold interval, processor 7 starts thick pressure governor motion 6 rapid pressure adjusting of inner ring by the PI control method of parameter self-tuning, and elastic sensing element 3 mechanism of outer shroud does not work; When error amount is within specification error threshold interval, pressure-sensing device 3 mechanism that processor 7 starts outer shroud by the PI control method of parameter self-tuning realizes accurate voltage regulating, and the thick pressure governor motion 6 of inner ring does not work.The circulation of above-mentioned closed loop control method is performed, until reach stable set pressure.
As shown in Figure 5, in the embodiment of the present invention, processor 7 adopts two close cycles parameter self-tuning PI control method to control pressure.Processor, by PI control algolithm, according to error amount size, adjusts Proportional coefficient K p and the integral coefficient Ki of PI link.Output and the error originated from input value of Kp control are proportional, are used for responding fast; Output and error amount that Ki controls be integrated into proportional relation, be used for elimination steady-state error.Namely when Error Absolute Value comparatively large (get in the present invention and be greater than 20% of inner and outer rings input value), Kp gets higher value (the present invention gets 25), Ki gets zero, now slightly press governor motion 6 or elastic sensing element 3 mechanism's rapid pressure adjusting or deformation fast, make Error Absolute Value reduce as early as possible; When Error Absolute Value is median size (get in the present invention be greater than 10% of inner and outer rings input value be less than 20% of inner and outer rings input value), Kp gets medium value (the present invention gets 20), Ki gets smaller value (the present invention gets 0.0005), now slightly press governor motion 6 or elastic sensing element 3 mechanism to reduce the speed of pressure regulation or deformation, prevent overshoot; When Error Absolute Value continues to reduce (the present invention get be greater than 5% of inner and outer rings input value be less than 10% of inner and outer rings input value), Kp should get smaller value (the present invention gets 5), Ki gets medium value (the present invention gets 0.01), now slowly regulates the deformation of thick pressure actuator 6 or elastic sensing element 3; When Error Absolute Value reaches minimum (the present invention gets and is less than 5% of outer shroud input value), Kp should get medium value (the present invention gets 10), Ki gets maximal value (the present invention gets 0.02), now the deformation of mainly fine adjustable elastic sensitive element 3, reaches the effect of accurate voltage regulating.Above process makes inside and outside two rings respond rapidly, thus enables the set pressure that double loop system reaches stable sooner, and the method is faster than traditional PI control method response speed.
Pressure transducer 10 in the embodiment of the present invention according to precision, performance need, can select common silicon piezoresistance type pressure sensor or silicon resonance type pressure transducer.Processor 7 can select the realizations such as common digital signal processor or ARM, as: TMS320F28335 etc.
In a kind of possible embodiment, consider that electric signal that pressure transducer 10 exports is generally the tiny signal of uA, mV level, and the pressure signal made in pressure chamber 11 can not suddenly change the short time, therefore recommend the ∑-Δ type simulated digital quantizer 9, such as AD7714 adopting high resolving power, high s/n ratio, high integration.
The set pressure of user's input can by touch-screen or simply button, charactron realization.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a pressure precise adjustment device, is characterized in that, comprising:
Topworks (1), it comprise elastic sensing element (3), elastic deformation conversion equipment (4), stepper motor and driver (5), slightly press governor motion (6) and make pressure chamber (11), the described cavity making pressure chamber (11) and described elastic sensing element (3) communicates, and inside cavity pressure is equal;
Control gear (2), it comprises processor (7), touch-screen (8), analog-digital converter (9), pressure transducer (10), the pressure in pressure chamber (11) is made described in described pressure transducer (10) sensing, export electric signal, described electric signal is after described analog-digital converter (9) conversion, resolved by described processor (7), after obtaining current pressure values, described processor (7) is by the error amount of the pressure set points that compares user and inputted by described touch-screen (8) and pressure currency, after described error amount is compared with specification error threshold value, double-closed-loop control is carried out to described topworks (1), the pressure in pressure chamber (11) is made described in adjustment,
Described processor (7), by PI control algolithm, according to error amount size, adjusts Proportional coefficient K p and the integral coefficient Ki of PI link, and wherein, output and the error originated from input value of Kp control are proportional, are used for responding fast; Output and error amount that Ki controls be integrated into proportional relation, be used for elimination steady-state error; When Error Absolute Value is greater than 20% of inner and outer rings input value, Kp gets higher value 25, Ki and gets zero, now slightly presses governor motion (6) or elastic sensing element (3) rapid pressure adjusting or deformation fast, makes Error Absolute Value reduce as early as possible; When Error Absolute Value be greater than 10% of inner and outer rings input value be less than 20% of inner and outer rings input value time, Kp gets 20, Ki gets 0.0005, now slightly presses governor motion (6) or elastic sensing element (3) to reduce the speed of pressure regulation or deformation, prevents overshoot; When Error Absolute Value is greater than 5% of inner and outer rings input value and is less than 10% of inner and outer rings input value, Kp gets 5, Ki and gets 0.01, and now slowly the deformation of governor motion (6) or elastic sensing element (3) is slightly pressed in adjustment; When Error Absolute Value is less than 5% of outer shroud input value, Kp gets 10, Ki and gets maximal value 0.02.
2. pressure precise adjustment device as claimed in claim 1, it is characterized in that, described double-closed-loop control comprises further:
When error amount is in outside error threshold interval, described processor (7) starts inner ring, controls described thick pressure governor motion (6) and slightly presses adjustment fast;
When described error amount is within described error threshold interval, described processor (7) starts outer shroud, control the turning to of described stepper motor and driver (5), angle, changed the cavity volume of described elastic sensing element (3) by described elastic deformation conversion equipment (4), described in regulating, make the pressure of pressing in chamber (11).
3. pressure precise adjustment device as claimed in claim 2, it is characterized in that, it is described when described error amount is within described error threshold interval, described processor (7) starts outer shroud, control turning to of described stepper motor and driver (5), angle, the cavity volume of described elastic sensing element (3) is changed by described elastic deformation conversion equipment (4), the pressure of pressing in chamber (11) is made described in regulating, comprise further: when making the pressure in pressure chamber (11) described in needs raise, reduce the cavity volume of described elastic sensing element (3), when needing the pressure made described in reduction in pressure chamber (11), increase the cavity volume of described elastic sensing element (3).
4. pressure precise adjustment device as claimed in claim 1, is characterized in that, described elastic sensing element (3) is bourdon tube, corrugated tube or flexible sheet.
5. the pressure precise adjustment device as described in any one of claim 1-4, is characterized in that, described pressure transducer (10) is silicon piezoresistance type pressure sensor or silicon resonance type pressure transducer.
6. pressure precise adjustment device as claimed in claim 1, it is characterized in that, described analog-digital converter (9) is ∑-Δ type simulated digital quantizer (9).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210586305.6A CN103092222B (en) | 2012-12-31 | 2012-12-31 | A kind of pressure precise adjustment device |
| CA2837786A CA2837786A1 (en) | 2012-12-31 | 2013-12-19 | Apparatus for precise pressure adjustment |
| PCT/CN2013/090202 WO2014101728A1 (en) | 2012-12-31 | 2013-12-23 | Device for precisely adjusting pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210586305.6A CN103092222B (en) | 2012-12-31 | 2012-12-31 | A kind of pressure precise adjustment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103092222A CN103092222A (en) | 2013-05-08 |
| CN103092222B true CN103092222B (en) | 2016-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210586305.6A Active CN103092222B (en) | 2012-12-31 | 2012-12-31 | A kind of pressure precise adjustment device |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN103092222B (en) |
| CA (1) | CA2837786A1 (en) |
| WO (1) | WO2014101728A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103092222B (en) * | 2012-12-31 | 2016-01-27 | 孙晓君 | A kind of pressure precise adjustment device |
| CN103116370B (en) * | 2013-01-04 | 2015-06-03 | 北京银谷科讯信息技术有限公司 | Pressure regulating device |
| CN106981556A (en) * | 2017-03-24 | 2017-07-25 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | It is a kind of can fine adjustment spacing expansion film machine and its adjusting method |
| CN110579329B (en) * | 2019-06-27 | 2024-04-19 | 中国空气动力研究与发展中心低速空气动力研究所 | Sub/transonic jet noise research test device |
| CN111381614B (en) * | 2020-03-26 | 2023-09-12 | 杭州汇健科技有限公司 | In-situ pressure acquisition micro-control device and control method thereof |
| CN112032380B (en) * | 2020-08-25 | 2022-03-22 | 中车青岛四方车辆研究所有限公司 | Pressure reducing device and closed-loop control method for pressure output regulation of pressure reducing device |
| CN112850207B (en) * | 2021-01-06 | 2023-04-18 | 内蒙古蒙维科技有限公司 | Method for controlling powder buffering and flow stabilizing warehouse weight warehouse pressure |
| CN112945461B (en) * | 2021-02-02 | 2022-05-20 | 同济大学 | Multifunctional pressure gauge automatic test system, method and device |
| CN115254217B (en) * | 2022-07-27 | 2023-12-01 | 领航基因科技（杭州）有限公司 | Droplet preparation device and method |
| US11964271B2 (en) | 2022-07-27 | 2024-04-23 | Pilot Gene Technology (hangzhou) Co., Ltd. | Drop preparation device and drop preparation method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3941148A (en) * | 1975-04-17 | 1976-03-02 | Sun Oil Company Of Pennsylvania | Control valve drive |
| US4575313A (en) * | 1983-02-02 | 1986-03-11 | Halliburton Company | Digital pressure controller |
| CN101256417B (en) * | 2008-02-25 | 2010-06-16 | 周德海 | Proportional valve pair accurate atmosphere controller |
| CN201886370U (en) * | 2010-12-16 | 2011-06-29 | 河南省中分仪器有限公司 | Intelligent gas flow rate and pressure controller |
| CN102385397A (en) * | 2011-09-29 | 2012-03-21 | 北京振兴计量测试研究所 | High-precision pressure control system based on high-speed solenoid valve |
| CN103092222B (en) * | 2012-12-31 | 2016-01-27 | 孙晓君 | A kind of pressure precise adjustment device |
-
2012
- 2012-12-31 CN CN201210586305.6A patent/CN103092222B/en active Active
-
2013
- 2013-12-19 CA CA2837786A patent/CA2837786A1/en not_active Abandoned
- 2013-12-23 WO PCT/CN2013/090202 patent/WO2014101728A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN103092222A (en) | 2013-05-08 |
| WO2014101728A1 (en) | 2014-07-03 |
| CA2837786A1 (en) | 2014-06-30 |
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Effective date of registration: 20160720 Address after: 065000 Langfang City, Hebei Province Economic and Technological Development Zone Guangyang Cheong Cheung Road No. 10 Patentee after: Watson Measurement & Control Technology (Hebei) Co., Ltd. Address before: 100191, Beijing, Haidian District, 238 North Fourth Ring Road, 100 Yan building, room 13, room 1301 Patentee before: Sun Xiaojun |