CN101629861B - Torque rotary speed sensor - Google Patents
Torque rotary speed sensor Download PDFInfo
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- CN101629861B CN101629861B CN2008101166297A CN200810116629A CN101629861B CN 101629861 B CN101629861 B CN 101629861B CN 2008101166297 A CN2008101166297 A CN 2008101166297A CN 200810116629 A CN200810116629 A CN 200810116629A CN 101629861 B CN101629861 B CN 101629861B
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Abstract
The invention discloses a torque rotary speed sensor, which comprises a torque sensor, a rotary speed sensor and a signal processor, wherein the torque sensor is used for measuring the torque and outputting a torque frequency signal having a mathematic relation with the torque; the rotary speed sensor is used for measuring the rotary speed and outputting a rotary speed frequency signal having a mathematic relation with the rotary speed; and the signal processor is connected with the torque sensor and the rotary speed sensor, and used for processing the torque frequency signal and the rotary speed frequency signal, acquiring a torque parameter and a rotary speed parameter, outputting an analog torque signal and an analog rotary speed signal corresponding to the torque parameter and the rotary speed parameter respectively, converting the analog torque signal and the analog rotary speed signal into a digital torque signal and a digital rotary speed signal, and outputting the digital torque signal and the digital rotary speed signal by a field bus. The sensor can meet higher requirements of a user on the integration degree of a system and technical requirements on transmitting test data by the industrial field bus interface.
Description
Technical field
The present invention relates to field of measuring technique, relate in particular to a kind of torque rotary speed sensor, this torque rotary speed sensor can be via fieldbus to extraneous transmission of digital measuring-signal.
Background technology
At present, torque rotary speed sensor reaches in the electromechanical integration equipments such as numerical controlled machinery machining center, automatic machine tool in numerous rotary power test macro such as motor, engine, generator, blower fan, stirring machine, windlass, boring mechanic and has obtained to use widely.In the prior art, torque rotary speed sensor is made up of the torque sensor of measuring torque and speed probe two parts of measuring rotating speed.Torque sensor is sensitive element usually with the resistance strain gage, rotating shaft or with elastic shaft that rotating shaft is connected in series on four precise resistance/strain sheets are installed, and connect into the Hui Sidun electric bridge to them.The distortion of axle can cause that the resistance of foil gauge changes, and electric bridge output signal and torque are proportional, and adopts conducting slip ring to come coupling power input and strain signal output.Traditional speed probe has the mode that adopts gear to measure rotating speed; Also have to be employed on the turning axle fluted disc that is processed with the grid groove is installed, produce light source and photoresistance receiving optical signals through lighting transistor and export pulsed voltage or current pulse signal and measure rotating speed.
The defective of prior art is: no matter be torque sensor or speed probe, its output signal is simulating signal, and along with the user improves constantly the requirement of system integration degree, the output of simulating signal can not have been satisfied the demand of metering circuit design.And along with the continuous development of large scale integrated circuit and automatic control technology, the measuring-signal that torque rotary speed sensor is obtained transmits through industrial field bus and becomes active demand.
Summary of the invention
The objective of the invention is defective, a kind of torque rotary speed sensor is provided, to realize via fieldbus to extraneous transmission of digital measurement data to prior art.
For realizing above-mentioned purpose, the invention provides a kind of torque rotary speed sensor, comprising:
Torque sensor is used to measure torque and exports the torque frequency signal that becomes mathematical relation with said torque;
Speed probe is used to measure rotating speed and exports the speed-frequency signal that becomes mathematical relation with said rotating speed;
Signal processor; Be connected with said speed probe with said torque sensor; Be used for said torque frequency signal and said speed-frequency signal are carried out signal Processing; Obtain torque parameter and rotary speed parameter, output and said torque parameter corresponding simulating dtc signal, with said rotary speed parameter corresponding simulating tach signal, said simulation dtc signal and said simulation tach signal are converted to digital dtc signal and digital tach signal and export via fieldbus.
Can know that by technique scheme the present invention can carry out signal Processing to torque frequency signal and speed-frequency signal through signal processor, thereby obtains corresponding torque parameter and rotary speed parameter.Simultaneously; Can also convert torque parameter and rotary speed parameter to be applicable to digital dtc signal and digital tach signal according to the interface protocol of fieldbus through conversion of signals, satisfy that the user improves constantly the requirement of system integration degree and can be through the technical need of industrial field bus interface transmission measurement data via the fieldbus transmission.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the structured flowchart of torque rotary speed sensor first embodiment of the present invention;
Fig. 2 is the structured flowchart of torque rotary speed sensor second embodiment of the present invention;
Fig. 3 is the structural drawing of the torque rotary speed sensor second embodiment torque sensor of the present invention;
Fig. 4 is the structured flowchart of torque rotary speed sensor the 3rd embodiment of the present invention;
Fig. 5 is the input oscillogram of torque rotary speed sensor of the present invention the 3rd embodiment Signal Pretreatment unit;
Fig. 6 is the output waveform figure of torque rotary speed sensor of the present invention the 3rd embodiment Signal Pretreatment unit.
Embodiment
Fig. 1 is the structured flowchart of torque rotary speed sensor first embodiment of the present invention.As shown in Figure 1, this torque rotary speed sensor comprises: torque sensor 1, speed probe 2 and signal processor 3.
Particularly, torque sensor 1 is used to measure torque, and output becomes the torque frequency signal of mathematical relation with torque.Speed probe 2 is used to measure rotating speed, and output becomes the speed-frequency signal of mathematical relation with rotating speed.This mathematical relation can be for having the linear relationship of certain slope; Can be zero linear relationship also, equally also can be nonlinear relationship in certain period, having certain slope earlier, changing slope again into; According to the measurement demand, this mathematical relation can be selected voluntarily.Signal processor 3 is connected with speed probe 2 with torque sensor 1; Be used for torque frequency signal and speed-frequency signal are carried out signal Processing; Obtain torque parameter and rotary speed parameter; Output and torque parameter corresponding simulating dtc signal, with rotary speed parameter corresponding simulating tach signal, and will simulate dtc signal and simulate tach signal and convert digital dtc signal and digital tach signal to and export via fieldbus.
The present embodiment torque rotary speed sensor carries out signal Processing through signal processor to torque frequency signal and the speed-frequency signal that torque sensor and speed probe record, thereby obtains corresponding torque parameter and rotary speed parameter.Simultaneously, convert simulation dtc signal and simulation tach signal to the digital dtc signal that is applicable to field-bus interface transmission and digital tach signal and export via fieldbus.The output signal of this torque rotary speed sensor comprises simulation dtc signal, simulation tach signal, digital dtc signal and digital tach signal; Therefore; This torque rotary speed sensor can satisfy the demand of different user to measurement result; The signaling interface of compatible legacy product has simultaneously satisfied that the user improves constantly the requirement of system integration degree and can be through the technical need of industrial field bus interface transmission of digital measurement data.
Fig. 2 is the structured flowchart of torque rotary speed sensor second embodiment of the present invention.As shown in Figure 2, this torque rotary speed sensor comprises: torque sensor 1, speed probe 2 and signal processor 3.Torque sensor 1 can be measured torque, and output becomes the torque frequency signal of mathematical relation with torque.Speed probe 2 can be measured rotating speed, and output becomes the speed-frequency signal of mathematical relation with rotating speed.This mathematical relation can be for having the linear relationship of certain slope; Can be zero linear relationship also, equally also can be nonlinear relationship in certain period, having certain slope earlier, changing slope again into; According to the measurement demand, this mathematical relation can be selected voluntarily.Signal processor 3 is connected with speed probe 2 with torque sensor 1; Torque frequency signal and speed-frequency signal are carried out signal Processing; Obtain torque parameter and rotary speed parameter; Output and torque parameter corresponding simulating dtc signal, with rotary speed parameter corresponding simulating tach signal, and will simulate dtc signal and convert digital dtc signal and the digital tach signal that can be used in field-bus interface transmission to the simulation tach signal and export.
Torque sensor 1 can comprise: energy parts 10 and functional part 11.Functional part 11 is used to measure torque and exports the torque frequency signal that becomes mathematical relation with torque; Energy parts 10 provide power supply for this functional part 11.Further, these energy parts 10 can comprise: input can source coupler 100 and voltage stabilizer 101.This functional part 11 can comprise: strain bridge 110, amplifier 111, voltage to frequency converter 112 and output signal coupler 113.
Fig. 3 is the structural drawing of the torque rotary speed sensor second embodiment torque sensor of the present invention.As shown in Figure 3, the measurement of torque parameter is to adopt the strain principles of electrical measurement.The mechanically deform that strain axis 12 inductions produce because of torsion, this distortion is relevant with the variation of torque; The power supply that input ability source coupler 100 provides the outside is coupled on the strain axis 12, to the electron device that is positioned on the strain axis 12 power supply is provided.The contactless coupling scheme of the energy have solved the energy of measuring torque parameter under the rotation status problem are provided.Voltage stabilizer 101 can be connected by source coupler 100 with input, and the power source conversion that coupling is obtained becomes burning voltage and offers strain bridge 110, amplifier 111, voltage to frequency converter 112 and the output signal coupler 113 in the functional part 11.The voltage that can ensure to functional part 11 and provide through this voltage stabilizer 101 is stationary value.Strain bridge 110 is arranged on the strain axis 12; This strain bridge 110 is formed measuring bridge by the strainometer with same strain characteristic; When strain axis 12 receives torsion influence and after producing small mechanically deform; Respective change will take place in the strainometer resistance of strain bridge 110, and then the voltage that has influence on it changes, and measures thereby convert the distortion of strain axis 12 to voltage signal.Amplifier 111 carries out processing and amplifying with the voltage signal that records in the strain bridge 110 under the burning voltage that voltage stabilizer 101 provides.After the process processing and amplifying of amplifier 111, voltage to frequency converter 112 just converts the voltage signal after the processing and amplifying to the torque frequency signal under the burning voltage that voltage stabilizer 101 provides.Output signal coupler 113 is exported the torque frequency signal coupling of obtaining in the voltage to frequency converter 112 under the burning voltage that voltage stabilizer 101 provides.The contactless coupling scheme of signal have solved the problems of measurement of torque parameter under the rotation status.
The torque sensor of present embodiment is measured torque through strain bridge; Obtain the voltage signal corresponding with torque; And convert this voltage signal to frequency signal through voltage to frequency converter; And then obtain the torque frequency signal for subsequent treatment, contactless coupling scheme are all adopted in the input of the energy and the output of signal simultaneously, have therefore solved the problems of measurement of torque parameter under the rotation status.
Further, as shown in Figure 2, speed probe 2 comprises: code-disc 20 and optoelectronic switch 21.Optoelectronic switch 21 is according to the printing opacity pulse output speed frequency signal of code-disc 20.In practical application; On the code-disc 20 of speed probe 2 60 slots can be set; Optoelectronic switch 21 can be a grooved optoelectronic switch frame of being made up of light emitting diode and phototriode, and each tooth of code-disc 20 is when the light with light emitting diode shelters from, and phototriode is just exported a high level; When light is mapped to the window of photosensitive tube through slot; Phototriode is just exported a low level, and code-disc 20 whenever turns around just can obtain 60 pulses, and this pulse is the speed-frequency signal corresponding with rotating speed just.Therefore, in signal processor 3, can go out rotary speed parameter, promptly have the rotary speed parameter that umber of pulse under the situation of code-disc of 60 teeth equals per minute just in use according to this speed-frequency calculated signals.
Need explanation to be; Present embodiment has only provided the structure that 60 slots are set on code-disc; Can be in practical application according to the slot of the size design varying number of the rotating speed of measured target and code-disc to satisfy the different measuring demand; And this slot also can substitute by the structure such as light hole, as long as can let optoelectronic switch sense the printing opacity pulse.
The present embodiment torque rotary speed sensor obtains torque frequency signal and speed-frequency signal through torque sensor and speed probe; Signal processor carries out signal Processing to this torque frequency signal and speed-frequency signal, thereby obtains corresponding torque parameter and rotary speed parameter.Simultaneously, signal processor will be simulated dtc signal and converted digital dtc signal and the digital tach signal that is applicable to the fieldbus transmission to according to the interface protocol of fieldbus with the simulation tach signal.Therefore; This torque rotary speed sensor can satisfy the demand of different user to measurement result; The signaling interface of compatible legacy product has simultaneously satisfied that the user improves constantly the requirement of system integration degree and can be through the technical need of industrial field bus interface transmission measurement data.
Fig. 4 is the structured flowchart of torque rotary speed sensor the 3rd embodiment of the present invention.As shown in Figure 4; In the present embodiment; Torque sensor 1 and speed probe 2 are identical with structure among torque rotary speed sensor second embodiment of the present invention; In the present embodiment, signal processor 3 can comprise: signal pre-processing module 30, high speed measurement module 31, fieldbus module 32 and supply module 33.
Particularly; Signal pre-processing module 30 is connected with the output signal coupler 113 of torque sensor 1 and the optoelectronic switch 21 of speed probe 2, and the torque frequency signal of output signal coupler 113 outputs and the speed-frequency signal of optoelectronic switch 21 outputs are carried out shaping and Filtering Processing.This signal pre-processing module 30 may further include: shaping unit 300 and filter unit 301.Shaping unit 300 is connected with speed probe 2 with torque sensor 1; Can carry out the shaping processing and amplifying to torque simulating signal and rotating speed simulating signal; Particularly; Shaping unit 300 is connected with the output signal coupler 113 of torque sensor 1 and the optoelectronic switch 21 of speed probe 2, and the torque frequency signal of output signal coupler 113 outputs and the speed-frequency signal of optoelectronic switch 21 outputs are carried out the shaping processing.Filter unit 301 is connected with shaping unit 300, and torque simulating signal after can handling shaping and rotating speed simulating signal are carried out High frequency filter and handled.Particularly; Torque frequency signal after filter unit 301 can be handled shaping and speed-frequency signal carry out High frequency filter to be handled; Circuit has adopted the mode of voltage comparator; Be used for signal threshold voltage relatively through electric resistance partial pressure with setting, high frequency interference that superposes in the filtered signal and burr make that the torque frequency signal of post-processed and speed-frequency signal are comparatively pure.Fig. 5 is the input oscillogram of torque rotary speed sensor of the present invention the 3rd embodiment Signal Pretreatment unit; Fig. 6 is the output waveform figure of torque rotary speed sensor of the present invention the 3rd embodiment Signal Pretreatment unit.Through relatively knowing, be the pulse waveform of standard through the waveform behind the shaping filter, improved the measurement of later stage frequency and the accuracy of torque rotary speed calculation of parameter.
High speed measurement module 31 is connected with signal pre-processing module 30; Adopt the simulation dtc signal after synchronous counting method of multicycle is handled shaping filter to carry out frequency measurement with the simulation tach signal; Obtain simulation dtc signal frequency and simulation tach signal frequency, and according to simulation dtc signal frequency and simulation tach signal frequency computation part torque parameter and rotary speed parameter.Adopt synchronous counting method of multicycle can obtain the measurement result of degree of precision here, higher than the precision of traditional " frequency measurement method " and " surveying all methods ".In the concrete process that realizes; Circuit design can adopt embedded 32 bit CPUs to accomplish parameter measurement and data processing to signal; Because measured simulation dtc signal is frequency signal with the simulation tach signal; To the requirement of circuit be must measuring-signal time cycle, 32 bit CPUs of employing have higher working clock frequency, except that the characteristics with data processing, fast operation; Can form high precision clock measures frequency signal; 32 bit CPUs have abundant timer resource and to programmable counter/timer array (PCA) module of outside signal capture counting, the design of metering circuit can make full use of these hardware resources, thereby realize fast, the frequency signal of high precision, wide region measures.
Field-bus interface module 32 is connected with high speed measurement module 31, will simulate dtc signal and convert digital dtc signal and digital tach signal with the simulation tach signal to according to field bus protocol.The simulation dtc signal that this field-bus interface module 32 can will record according to the field bus protocol of standard converts digital dtc signal and digital tach signal to the simulation tach signal; Therefore the digital dtc signal and the digital tach signal of the requirement that meets the fieldbus transmission can be provided, satisfy the demand of large scale integrated circuit.In the concrete process that realizes, this fieldbus can use standard interfaces such as RS232, RS485.
Supply module 33 provides power supply for signal pre-processing module 30, high speed measurement module 31 and field-bus interface module 32.
This signal processor 3 can also comprise simulation output interface module 34; This simulation output interface module 34 is connected with the high speed measurement module with supply module 33, and simulation dtc signal after shaping filter is handled and simulation tach signal convert the standard square wave frequency signal and the output of the standard square wave frequency signal and the rotating speed of torque to.This simulation output interface module 34 can compatible existing product signaling interface; Can simulation dtc signal and simulation tach signal be converted to the square wave frequency signal of Transistor-Transistor Logic level standard, therefore can satisfy the demand that user's needs use simulation dtc signal and simulation tach signal.
Further, this signal processor 3 can also comprise data memory module 35, and this data memory module 35 is connected with high speed measurement module 31 with supply module 33, preserves and obtains torque parameter and required data and the measurement parameter of rotary speed parameter.Carry out in the process of frequency measurement at high speed measurement module 31, this data memory module 35 can be stored as measures necessary measurement parameter to accomplish measuring operation, and simultaneously, this data memory module 35 can also be preserved and calculate torque parameter and the rotary speed parameter that obtains.In concrete implementation procedure, this data memory module 35 can adopt the EEPROM device to accomplish data necessary and preserve, and it is long that this device has the life-span, and power down is the characteristics of obliterated data not.
The present embodiment torque rotary speed sensor can carry out signal Processing to this torque frequency signal and speed-frequency signal through signal processor, thereby obtains corresponding torque parameter and rotary speed parameter.Simultaneously; Can also will simulate dtc signal through fieldbus and convert digital dtc signal and the digital tach signal that is applicable to the fieldbus transmission to according to the interface protocol of fieldbus, satisfy that the user improves constantly the requirement of system integration degree and can be through the technical need of industrial field bus transmission measurement data with the simulation tach signal.Simultaneously; Can also make the signaling interface of torque rotary speed sensor compatible legacy product of the present invention through the simulation output interface module; Satisfy the demand of different user to measurement result; Can store the torque parameter and the rotary speed parameter of measurement through data memory module, and can also adjust measuring method and measuring accuracy, and then satisfy different measuring requirements through the necessary parameter of measurement that change is kept at wherein.
What should explain at last is: above embodiment is only in order to technical scheme of the present invention to be described but not limit it; Although the present invention has been carried out detailed explanation with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, also can not make amended technical scheme break away from the spirit and the scope of technical scheme of the present invention and these are revised or be equal to replacement.
Claims (9)
1. a torque rotary speed sensor is characterized in that, comprising:
Torque sensor is used to measure torque and exports the torque frequency signal that becomes mathematical relation with said torque;
Speed probe is used to measure rotating speed and exports the speed-frequency signal that becomes mathematical relation with said rotating speed;
Signal processor; Be connected with said speed probe with said torque sensor; Be used for said torque frequency signal and said speed-frequency signal are carried out signal Processing; Obtain torque parameter and rotary speed parameter, output and said torque parameter corresponding simulating dtc signal, with said rotary speed parameter corresponding simulating tach signal, said simulation dtc signal and said simulation tach signal are converted to digital dtc signal and digital tach signal and export via fieldbus.
2. torque rotary speed sensor according to claim 1 is characterized in that, said torque sensor comprises: energy parts and functional part,
Said functional part is used to measure torque, and output becomes the torque frequency signal of mathematical relation with said torque;
Said energy parts are that said functional part provides power supply.
3. torque rotary speed sensor according to claim 2 is characterized in that, said energy parts comprise:
Input ability source coupler is used for external power source is coupled to strain axis;
Voltage stabilizer can be connected by source coupler with said input, is used for converting the external power source that is coupled to strain axis to burning voltage, and offers said functional part.
4. torque rotary speed sensor according to claim 2 is characterized in that, said functional part comprises:
Strain bridge is arranged on the strain axis, is used for converting the mechanically deform of said strain axis to electric signal;
Amplifier is used for said electric signal is amplified;
Voltage to frequency converter is used for the electrical signal conversion after amplifying is become the torque frequency signal;
The output signal coupler is used for said torque frequency signal coupling output.
5. torque rotary speed sensor according to claim 1 is characterized in that, said speed probe comprises: code-disc and optoelectronic switch,
Said optoelectronic switch is used to receive the light pulse signal of the transmission of said code-disc, and the corresponding speed-frequency signal of output.
6. torque rotary speed sensor according to claim 1 is characterized in that, said signal processor comprises:
Signal pre-processing module is used for said simulation dtc signal and said simulation tach signal are carried out shaping, filtering;
The high speed measurement module; Be used to adopt the simulation dtc signal after synchronous counting method of multicycle is handled shaping filter to carry out frequency measurement with the simulation tach signal; Obtain the frequency of simulation dtc signal and the frequency of simulation tach signal, and according to the frequency of said simulation dtc signal and the said torque parameter of frequency computation part and the said rotary speed parameter of said simulation tach signal;
The field-bus interface module is used for converting said simulation dtc signal and said simulation tach signal to digital dtc signal and digital tach signal and output according to field bus protocol through fieldbus;
Supply module is used to said signal pre-processing module, said high speed measurement module and said field-bus interface module power supply is provided.
7. torque rotary speed sensor according to claim 6 is characterized in that, said signal processor also comprises:
The simulation output interface module is used for simulation dtc signal after the said shaping filter processing and simulation tach signal are converted to the standard square wave frequency signal and the output of the standard square wave frequency signal and the rotating speed of torque.
8. torque rotary speed sensor according to claim 6 is characterized in that, said signal processor also comprises:
Data memory module is used to preserve and obtains said torque parameter and required data and the measurement parameter of said rotary speed parameter.
9. torque rotary speed sensor according to claim 6 is characterized in that, said signal pre-processing module comprises:
Shaping unit is used for said torque simulating signal and rotating speed simulating signal are carried out the shaping processing and amplifying;
Filter unit is used for torque simulating signal after the shaping processing and amplifying and rotating speed simulating signal are carried out the High frequency filter processing.
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| CN2008101166297A CN101629861B (en) | 2008-07-14 | 2008-07-14 | Torque rotary speed sensor |
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| CN2008101166297A CN101629861B (en) | 2008-07-14 | 2008-07-14 | Torque rotary speed sensor |
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| CN101629861B true CN101629861B (en) | 2012-05-09 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141574B (en) * | 2010-12-31 | 2012-07-25 | 西安交通大学 | Portable turbine dynamic rotating speed measuring device and method |
| CN104181324A (en) * | 2013-05-27 | 2014-12-03 | 深圳市海洋王照明工程有限公司 | Device for measuring rotating speed of motor and electronic equipment |
| CN103913591B (en) * | 2014-03-03 | 2017-09-05 | 深圳市智慧机器技术有限公司 | Slewing rotating speed measurement method and device |
| CN104374943A (en) * | 2014-11-21 | 2015-02-25 | 无锡科思电子科技有限公司 | Speed detecting device for car engine |
| CN104360098A (en) * | 2014-11-21 | 2015-02-18 | 无锡科思电子科技有限公司 | Vehicle speed detecting method based on vehicle engine |
| CN104807574A (en) * | 2015-04-25 | 2015-07-29 | 成都诚邦动力测试仪器有限公司 | Torque sensor based on voltage compensation |
| CN114441077A (en) * | 2021-12-28 | 2022-05-06 | 四川诚邦浩然测控技术有限公司 | Strain type torque and rotating speed sensor |
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| CN2220065Y (en) * | 1994-10-07 | 1996-02-14 | 李国林 | Intelligence coupling |
| CN101290256A (en) * | 2008-06-16 | 2008-10-22 | 中国农业大学 | Rotating machinery driver power test device |
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| DE8511143U1 (en) * | 1985-04-16 | 1985-06-27 | Dietrich Grünau GmbH & Co KG, 7778 Markdorf | Measuring hub for torque and speed measurement on rotating machine parts |
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Address after: 100194 Beijing City, Haidian District Institute of Road No. 2 building a layer of Patentee after: BEIJING XINYUHAN MEASUREMENT & CONTROL TECHNOLOGY CO.,LTD. Patentee after: Zhang Li Address before: 100095 Beijing city Haidian District Baijiatuan Yi Xi Zhuang District South Garden E10 Patentee before: Beijing Xinyuhang Century Science & Technology Co.,Ltd. Patentee before: Zhang Li |
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Effective date of registration: 20161110 Address after: 100194 Beijing City, Haidian District Institute of Road No. 2 building a layer of Patentee after: BEIJING XINYUHAN MEASUREMENT & CONTROL TECHNOLOGY CO.,LTD. Address before: 100194 Beijing City, Haidian District Institute of Road No. 2 building a layer of Patentee before: BEIJING XINYUHAN MEASUREMENT & CONTROL TECHNOLOGY CO.,LTD. Patentee before: Zhang Li |