CN105293241B - The method of estimation and system of elevator traction machine band-type brake torque - Google Patents
The method of estimation and system of elevator traction machine band-type brake torque Download PDFInfo
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- CN105293241B CN105293241B CN201510831418.1A CN201510831418A CN105293241B CN 105293241 B CN105293241 B CN 105293241B CN 201510831418 A CN201510831418 A CN 201510831418A CN 105293241 B CN105293241 B CN 105293241B
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Abstract
The present invention relates to a kind of method of estimation and system of elevator traction machine band-type brake torque, wherein, the method for estimation of elevator traction machine band-type brake torque is comprised the following steps：Enter resting state in elevator, and during in default band-type brake detection cycle, into band-type brake detection pattern, control band-type brake is held tightly；Elevator frequency converter is driven to apply default driving moment to elevator traction machine；The car slipping umber of pulse that the encoder of Real-time Collection elevator traction machine sends, and obtain the output current value of elevator frequency converter；According to the car slipping umber of pulse and output current value that are collected within the time period for applying default driving moment, the size of brake sticking brake torque is calculated；In the brake sticking brake torque being calculated braking moment specified less than band-type brake, control elevator is out of service or generates early warning Trouble Report.When brake sticking brake torque is not enough, quotes failure and pointed out to notify elevator repair and maintenance personnel, elevator internal contracting brake is overhauled as early as possible, realize the effective protection for passenger's personal safety.
Description
Technical field
The present invention relates to elevator internal contracting brake control technology, more particularly to a kind of method of estimation of elevator traction machine band-type brake torque
And system.
Background technology
Band-type brake is to work as lift car to be in the electromechanical assembly that static and motor prevents elevator from moving again under power failure state,
Elevator it is actually used in, often occur the phenomenon of slide occur because brake sticking brake power is not enough, cause to occur serious
Security incident, and in the daily repair and maintenance of elevator, the detection to brake sticking brake power lacks effective means, the brake force of band-type brake is complete
The full braking moment by when dispatching from the factory determines, the caused braking moment such as brake block abrasion cannot be subsequently determined in use and is subtracted
Small situation, has a strong impact on the personal safety of passenger.
The content of the invention
Based on this, it is necessary to for brake sticking brake power and the test problems of braking moment, there is provided a kind of elevator traction machine
The method of estimation and system of band-type brake torque.
To achieve these goals, the embodiment of technical solution of the present invention is：
On the one hand, there is provided a kind of method of estimation of elevator traction machine band-type brake torque, comprise the following steps：
Enter resting state in elevator, and during in default band-type brake detection cycle, into band-type brake detection pattern, control is embraced
Lock is held tightly；
Elevator frequency converter is driven to apply default driving moment to elevator traction machine；
The car slipping umber of pulse that the encoder of Real-time Collection elevator traction machine sends, and obtain the output current of elevator frequency converter
Value；
According to the car slipping umber of pulse and output current value that are collected within the time period for applying default driving moment,
Calculate the size of brake sticking brake torque；
In the brake sticking brake torque being calculated braking moment specified less than band-type brake, control elevator is out of service or generates
Early warning Trouble Report.
On the other hand, there is provided a kind of estimating system of elevator traction machine band-type brake torque, including：
Band-type brake drive module, for entering resting state in elevator, and during in default band-type brake detection cycle, control is embraced
Lock is held tightly；
Apply torque module, for controlling elevator frequency converter to apply default driving moment to elevator traction machine；
Encoder pulse acquisition module, for according to default driving moment, the encoder of Real-time Collection elevator traction machine
The car slipping umber of pulse for sending；
Obtain current module, the output current value for obtaining elevator frequency converter；
Computing module, for being collected according to output current value and within the time period for applying default driving moment
Car slipping umber of pulse, calculate brake sticking brake torque size；
Fault pre-alarming module, the brake sticking brake torque for being calculated in computing module is less than the specified braking moment of band-type brake
When, control elevator is out of service or generates early warning Trouble Report.
Above-mentioned technical proposal has the advantages that：
The present invention for existing detection means deficiency provide a kind of method of estimation of elevator traction machine band-type brake torque and
System, can apply a certain size torque to motor at unmanned boarding (elevator enters resting state) by controlling frequency converter,
The microdisplacement combination elevator model produced according to encoder during applying torque calculates the size of brake sticking brake torque automatically,
Hence for the situation that brake sticking brake torque is not enough, quote failure and pointed out, while elevator repair and maintenance personnel are notified, as early as possible to electricity
Terraced band-type brake is overhauled, and realizes the effective protection for passenger's personal safety.
Brief description of the drawings
By being more particularly described for the preferred embodiments of the present invention shown in accompanying drawing, above and other mesh of the invention
, feature and advantage will become more fully apparent.Identical reference indicates identical part in whole accompanying drawings, and does not carve
Meaning draws accompanying drawing by actual size equal proportion scaling, it is preferred that emphasis is show purport of the invention.
Fig. 1 is the schematic flow sheet of the method for estimation embodiment 1 of elevator traction machine band-type brake torque of the present invention；
Fig. 2 is the structural representation of the estimating system embodiment 1 of elevator traction machine band-type brake torque of the present invention.
Specific embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give first-selected embodiment of the invention.But, the present invention can be realized in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose that these embodiments are provided be make to the disclosure more it is thorough comprehensively.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more phases
The arbitrary and all of combination of the Listed Items of pass.
The method of estimation embodiment 1 of elevator traction machine band-type brake torque of the present invention：
In order to solve the problems, such as to lack effective means to brake sticking brake power and detecting for braking moment in conventional art,
The invention provides a kind of method of estimation embodiment 1 of elevator traction machine band-type brake torque；Fig. 1 is elevator traction machine band-type brake of the present invention
The schematic flow sheet of the method for estimation embodiment 1 of torque；As shown in figure 1, may comprise steps of：
Step S110：Enter resting state in elevator, and during in default band-type brake detection cycle, mould is detected into band-type brake
Formula, control band-type brake is held tightly；
Step S120：Elevator frequency converter is driven to apply default driving moment to elevator traction machine；
Step S130：The car slipping umber of pulse that the encoder of Real-time Collection elevator traction machine sends, and obtain elevator frequency converter
Output current value；
Step S140：According to the car slipping umber of pulse collected within the time period for applying default driving moment and defeated
Go out current value, calculate the size of brake sticking brake torque；
Step S150：In the brake sticking brake torque being calculated braking moment specified less than band-type brake, control elevator stops
Operation or generation early warning Trouble Report.
In a specific embodiment, the size of brake sticking brake torque is calculated based on below equation：
Wherein, fZIt is brake sticking brake torque；G is the weight of system rotating part；D is straight for the rotation of system rotating part
Footpath；
T is traction machine electromagnetic torque, is calculated based on below equation：
T=KI
K is traction machine electromagnetic torque constant；I is the output current value of elevator frequency converter；
TZFor the torque that counterweight-side and cage side are produced to the difference of the pulling force of traction sheave；Cage side lineoutofservice signal pull and counterweight
Side lineoutofservice signal pull is calculated based on below equation：
T1It is cage side lineoutofservice signal pull；GmIt is car weight；M is car mass；
T2It is counterweight-side lineoutofservice signal pull；GMIt is load weight；M is counterweight mass；
N is traction machine rotating speed, is calculated based on below equation：
Δ P is the car slipping umber of pulse of the encoder in the Δ T sampling intervals；Δ T is the sampling interval.
In a specific embodiment, the method for estimation embodiment 1 of elevator traction machine band-type brake torque can also include step
Suddenly：
Set and preserve default band-type brake detection cycle.
It is special by taking the process of elevator running operation as an example in order to further explain technical scheme, elevator of the present invention
The implementing procedure of the method for estimation embodiment 1 of traction machine band-type brake torque can be：
It is specific at one when judging to have arrived the band-type brake detection cycle of setting after elevator enters resting state
Embodiment in, can be by EEPROM (the Electrically Erasable Programmable of elevator control panel
Read-Only Memory：EEPROM) set and preserve above-mentioned band-type brake detection cycle；Band-type brake is kept to connect
Tentaculum is off-state, does not open band-type brake, and control frequency converter sends a certain size driving moment to traction machine, and (big I sets
Fixed, default value is 150% Rated motor torque), while the encoder that Real-time Collection is arranged on elevator traction arbor sends
Car slipping pulse, and obtain the output current value of elevator frequency converter.
Encoder car slipping umber of pulse and above-mentioned output current are detected according within this period for applying driving moment
Value, for traction machine, can calculate the size of brake sticking brake torque according to elevator model with reference to the below equation that derive：
①
②
Wherein, J is the total rotary inertia on motor reel；ω is traction machine angular speed；G is the weight of system rotating part
Amount；D is the rotation diameter of system rotating part；
By 3. 1. and 2. formula can be drawn
③
In formula：T is traction machine electromagnetic torque, and the output current value of frequency converter when running can be measured by elevator control panel
Direct access, i.e.,：
T=KI
K is traction machine electromagnetic torque constant；I is the output current value of elevator frequency converter；
N is traction machine rotating speed, is calculated based on below equation：
Δ P is the car slipping umber of pulse of the encoder in the Δ T sampling intervals；Δ T is the sampling interval.
fZIt is brake sticking brake torque；TZFor the torque that counterweight-side and cage side are produced to the difference of the pulling force of traction sheave；Cage side
Lineoutofservice signal pull and counterweight-side lineoutofservice signal pull are calculated based on below equation：
④
T1It is cage side lineoutofservice signal pull；GmIt is car weight；M is car mass；
⑤
T2It is counterweight-side lineoutofservice signal pull；GMIt is load weight；M is counterweight mass；
According to formula 3. 4. 5., it is brake sticking brake torque f that can calculateZSize.
It is big relative to the specified braking moment of band-type brake according to band-type brake torque after brake sticking brake torque size is calculated
Small, if brake sticking brake torque wretched insufficiency, quotes catastrophe failure, elevator is out of service；If brake sticking brake power is slightly not enough,
Generation early warning failure, points out repair and maintenance personnel, if brake sticking brake torque is good, testing result is automatically saved.
Further, it is also possible to according to the encoder car slipping pulse number gathered during applying driving moment to motor, will be above-mentioned
Encoder car slipping pulse number uploads to elevator long-distance monitorng center by network, long according to elevator by elevator long-distance monitorng center
The encoder car slipping pulse number being collected into phase running, it is established that the model of brake sticking brake power decay, can be to band-type brake
Carry out pre- diagnosis.
The present invention provides a kind of method of estimation reality of elevator traction machine band-type brake torque for the deficiency of existing detection means
Example 1 is applied, a certain size power can be applied to motor by controlling frequency converter at unmanned boarding (elevator enters resting state)
Square, the big of brake sticking brake torque is calculated according to the microdisplacement combination elevator model that encoder during applying torque is produced automatically
It is small, hence for the situation that brake sticking brake torque is not enough, quote failure and pointed out, while elevator repair and maintenance personnel are notified, as early as possible
Elevator internal contracting brake is overhauled, the effective protection for passenger's personal safety is realized.
The estimating system embodiment 1 of elevator traction machine band-type brake torque of the present invention：
In order to solve the problems, such as to lack effective means to brake sticking brake power and detecting for braking moment in conventional art,
Present invention also offers a kind of estimating system embodiment 1 of elevator traction machine band-type brake torque of the present invention；Fig. 2 is draged for elevator of the present invention
Draw the structural representation of the estimating system embodiment 1 of machine band-type brake torque.As shown in Fig. 2 can include：
Band-type brake drive module 200, for entering resting state in elevator, and during in default band-type brake detection cycle, control
Band-type brake processed is held tightly；
Apply torque module 210, for controlling elevator frequency converter to apply default driving moment to elevator traction machine；
Encoder pulse acquisition module 220, for according to default driving moment, the coding of Real-time Collection elevator traction machine
The car slipping umber of pulse that device sends；
Obtain current module 230, the output current value for obtaining elevator frequency converter；
Computing module 240, for applying the time period of default driving moment according to encoder pulse acquisition module 220
The car slipping umber of pulse for inside collecting and the output current value for obtaining the acquisition of current module 230, calculate brake sticking brake torque
Size；
Fault pre-alarming module 250, the brake sticking brake torque for being calculated in computing module 240 is less than the specified system of band-type brake
During kinetic moment, control elevator is out of service or generates early warning Trouble Report.
In a specific embodiment, computing module 240 is based on below equation and calculates brake sticking brake torque：
Wherein, fZIt is brake sticking brake torque；G is the weight of system rotating part；D is straight for the rotation of system rotating part
Footpath；
T is traction machine electromagnetic torque, is calculated based on below equation：
T=KI
K is traction machine electromagnetic torque constant；I is the output current value of elevator frequency converter；
TZFor the torque that counterweight-side and cage side are produced to the difference of the pulling force of traction sheave；Cage side lineoutofservice signal pull and counterweight
Side lineoutofservice signal pull is calculated based on below equation：
T1It is cage side lineoutofservice signal pull；GmIt is car weight；M is car mass；
T2It is counterweight-side lineoutofservice signal pull；GMIt is load weight；M is counterweight mass；
N is traction machine rotating speed, is calculated based on below equation：
Δ P is the car slipping umber of pulse of the encoder in the Δ T sampling intervals；Δ T is the sampling interval.
In a specific embodiment, band-type brake drive module 200, opening and holding specifically for controlling band-type brake；And
Enter resting state in elevator, and during in default band-type brake detection cycle, the band-type brake contactor for controlling elevator is off-state.
In a specific embodiment, computing module 240 is additionally operable to be more than or equal to band-type brake volume in brake sticking brake torque
During customization kinetic moment, the brake sticking brake torque is preserved.
In a specific embodiment, also including setting cycle module 260, for setting and the inspection of default band-type brake is preserved
The survey cycle.
In order to further explain technical scheme, by taking elevator running as an example, elevator can include encoder, electricity to spy
Terraced traction machine, elevator control panel, elevator frequency converter etc., wherein encoder are arranged on elevator traction arbor.Elevator of the present invention is draged
Drawing the implementation process of the estimating system embodiment 1 of machine band-type brake torque can be：
Elevator control panel includes band-type brake drive module, applies torque module, and encoder pulse acquisition module obtains current-mode
Block, computing module and fault pre-alarming module；
After elevator enters resting state, when elevator control panel judges to have arrived the band-type brake detection cycle of setting,
In a specific embodiment, can be by EEPROM (the Electrically Erasable of elevator control panel
Programmable Read-Only Memory：EEPROM) set and preserve above-mentioned band-type brake detection week
Phase；It is off-state that band-type brake drive module keeps band-type brake contactor, does not open band-type brake, applies torque module control frequency converter to draging
Draw machine and send a certain size driving moment (big I setting, default value is 150% Rated motor torque), while encoder
The car slipping pulse that the encoder that pulse collection module Real-time Collection is arranged on elevator traction arbor sends, specifically elevator control
The encoder pulse acquisition module of making sheet is nursed one's health encoder pulse signal by interface circuit, and sends elevator controlling to
Plate.Obtain the output current value that current module obtains elevator frequency converter
Encoder car slipping umber of pulse and above-mentioned output current are detected according within this period for applying driving moment
Value, for traction machine, computing module can calculate brake sticking brake torque according to elevator model with reference to the below equation that derive
Size：
①
②
Wherein, J is the total rotary inertia on motor reel；ω is traction machine angular speed；G is the weight of system rotating part
Amount；D is the rotation diameter of system rotating part；
By 3. 1. and 2. formula can be drawn
③
In formula：T is traction machine electromagnetic torque, output current of frequency converter when running can be measured by elevator control panel direct
Obtain, i.e.,：
T=KI
K is traction machine electromagnetic torque constant；I is the output current value of elevator frequency converter；
N is traction machine rotating speed, is calculated based on below equation：
Δ P is the car slipping umber of pulse of the encoder in the Δ T sampling intervals；Δ T is the sampling interval.
fZIt is brake sticking brake torque；TZFor the torque that counterweight-side and cage side are produced to the difference of the pulling force of traction sheave；Cage side
Lineoutofservice signal pull and counterweight-side lineoutofservice signal pull are calculated based on below equation：
④
T1It is cage side lineoutofservice signal pull；GmIt is car weight；M is car mass；
⑤
T2It is counterweight-side lineoutofservice signal pull；GMIt is load weight；M is counterweight mass；
According to formula 3. 4. 5., it is brake sticking brake torque f that computing module can be calculatedZSize.
After computing module calculates brake sticking brake torque size, fault pre-alarming module according to band-type brake torque relative to
The size of the specified braking moment of band-type brake, if brake sticking brake torque wretched insufficiency, quotes catastrophe failure, elevator is out of service；If
Brake sticking brake power is slightly not enough, then generate early warning failure, points out repair and maintenance personnel, if brake sticking brake torque is good, will detect
Result is automatically saved, and is set torque module and is determined that the band-type brake torque of elevator traction machine is brake sticking brake torque.
Further, it is also possible to according to the encoder car slipping pulse number gathered during applying driving moment to motor, elevator control
Above-mentioned encoder car slipping pulse number is uploaded to elevator long-distance monitorng center by making sheet by network, by elevator long-distance monitorng center
According to the encoder car slipping pulse number being collected into elevator During Process of Long-term Operation, it is established that the model of brake sticking brake power decay,
Pre- diagnosis can be carried out to band-type brake.
The present invention provides a kind of estimating system reality of elevator traction machine band-type brake torque for the deficiency of existing detection means
Example 1 is applied, a certain size power can be applied to motor by controlling frequency converter at unmanned boarding (elevator enters resting state)
Square, the big of brake sticking brake torque is calculated according to the microdisplacement combination elevator model that encoder during applying torque is produced automatically
It is small, hence for the situation that brake sticking brake torque is not enough, quote failure and pointed out, while elevator repair and maintenance personnel are notified, as early as possible
Elevator internal contracting brake is overhauled, the effective protection for passenger's personal safety is realized.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (6)
1. a kind of method of estimation of elevator traction machine band-type brake torque, it is characterised in that comprise the following steps：
Enter resting state in elevator, and during in default band-type brake detection cycle, into band-type brake detection pattern, control band-type brake is embraced
Tightly；
Elevator frequency converter is driven to apply default driving moment to elevator traction machine；
The car slipping umber of pulse that the encoder of elevator traction machine described in Real-time Collection sends, and obtain the output of the elevator frequency converter
Current value；
According to car slipping umber of pulse and the output electricity collected within the time period for applying the default driving moment
Flow valuve, calculates the size of brake sticking brake torque；
In the brake sticking brake torque being calculated braking moment specified less than band-type brake, control elevator is out of service or generates
Early warning Trouble Report；
Wherein, the size of the brake sticking brake torque is calculated based on below equation：
Wherein, fZIt is brake sticking brake torque；G is the weight of system rotating part；D is the rotation diameter of system rotating part；
T is traction machine electromagnetic torque, is calculated based on below equation：
T=KI
K is traction machine electromagnetic torque constant；I is the output current value of elevator frequency converter；
TZFor the torque that counterweight-side and cage side are produced to the difference of the pulling force of traction sheave；Cage side lineoutofservice signal pull and counterweight-side steel
Cord pulling force is calculated based on below equation：
T1It is cage side lineoutofservice signal pull；GmIt is car weight；M is car mass；
T2It is counterweight-side lineoutofservice signal pull；GMIt is load weight；M is counterweight mass；
N is traction machine rotating speed, is calculated based on below equation：
Δ P is the car slipping umber of pulse of the encoder in the Δ T sampling intervals；Δ T is the sampling interval.
2. the method for estimation of elevator traction machine band-type brake torque according to claim 1, it is characterised in that also including step：
Set and preserve the default band-type brake detection cycle.
3. a kind of estimating system of elevator traction machine band-type brake torque, it is characterised in that including：
Band-type brake drive module, for entering resting state in elevator, and during in default band-type brake detection cycle, control band-type brake is embraced
Tightly；
Apply torque module, for controlling elevator frequency converter to apply default driving moment to elevator traction machine；
Encoder pulse acquisition module, for according to the default driving moment, the volume of elevator traction machine described in Real-time Collection
The car slipping umber of pulse that code device sends；
Obtain current module, the output current value for obtaining elevator frequency converter；
Computing module, for being collected according to the output current value and within the time period for applying default driving moment
The car slipping umber of pulse, calculate brake sticking brake torque size；
Fault pre-alarming module, the brake sticking brake torque for being calculated in computing module is less than the specified braking moment of band-type brake
When, control elevator is out of service or generates early warning Trouble Report；
Wherein, the computing module is based on below equation and calculates the brake sticking brake torque：
Wherein, fZIt is brake sticking brake torque；G is the weight of system rotating part；D is the rotation diameter of system rotating part；
T is traction machine electromagnetic torque, is calculated based on below equation：
T=KI
K is traction machine electromagnetic torque constant；I is the output current value of elevator frequency converter；
TZFor the torque that counterweight-side and cage side are produced to the difference of the pulling force of traction sheave；Cage side lineoutofservice signal pull and counterweight-side steel
Cord pulling force is calculated based on below equation：
T1It is cage side lineoutofservice signal pull；GmIt is car weight；M is car mass；
T2It is counterweight-side lineoutofservice signal pull；GMIt is load weight；M is counterweight mass；
N is traction machine rotating speed, is calculated based on below equation：
Δ P is the car slipping umber of pulse of the encoder in the Δ T sampling intervals；Δ T is the sampling interval.
4. the estimating system of elevator traction machine band-type brake torque according to claim 3, it is characterised in that the band-type brake drives
Module, opening and holding specifically for controlling band-type brake；And enter resting state in elevator, and detect week in default band-type brake
During the phase, the band-type brake contactor for controlling elevator is off-state.
5. the estimating system of elevator traction machine band-type brake torque according to claim 3, it is characterised in that the computing module
It is additionally operable to, in brake sticking brake torque braking moment specified more than or equal to the band-type brake, preserve the brake sticking brake power
Square.
6. the estimating system of elevator traction machine band-type brake torque according to claim 3, it is characterised in that also including setting week
Phase module, for setting and preserves the default band-type brake detection cycle.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106672723B (en) * | 2016-12-07 | 2018-12-11 | 日立楼宇技术（广州）有限公司 | Elevator brake method for detecting operation state and system |
| CN106986247A (en) * | 2017-04-19 | 2017-07-28 | 安徽固特福电子科技有限公司 | elevator traction performance testing device |
| CN107814288B (en) * | 2017-09-30 | 2023-10-13 | 南京市特种设备安全监督检验研究院 | Intelligent monitoring and early warning method for elevator brake |
| CN108147240B (en) * | 2017-12-06 | 2019-06-21 | 天津市特种设备监督检验技术研究院(天津市特种设备事故应急调查处理中心) | A kind of digitized elevator brake ability monitoring and method for early warning |
| CN110127482B (en) * | 2019-05-22 | 2022-09-27 | 安徽奥里奥克科技股份有限公司 | Elevator traction machine power monitoring method based on big data |
| CN115075685B (en) * | 2022-07-19 | 2024-03-12 | 安徽海尚变频技术有限公司 | Advanced band-type brake control method for improving accuracy of door machine |
| CN115625739B (en) * | 2022-12-20 | 2023-03-31 | 季华实验室 | Fault diagnosis method and relevant equipment for robot band-type brake system |
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| US6289727B1 (en) * | 1998-07-29 | 2001-09-18 | Inventio Ag | Elevator brake |
| CN104192662A (en) * | 2014-07-25 | 2014-12-10 | 杭州优迈科技有限公司 | Detecting method for braking torque of elevator brake |
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Address after: Nanxiang three road, Science City high tech Industrial Development Zone, Guangzhou city of Guangdong Province, No. 2 510660 Patentee after: Hitachi building technologies (Guangzhou) Co. Ltd. Address before: Nanxiang Road three Guangzhou Science City 510660 high tech Industrial Development Zone, Guangdong city of Guangzhou province No. 2 Patentee before: Guangzhou Ropente Science and Technology Development Co., Ltd. |