CN107918094A - Portable Electric Actuator veneer detection device and its detection method - Google Patents

Portable Electric Actuator veneer detection device and its detection method Download PDF

Info

Publication number
CN107918094A
CN107918094A CN201711107007.3A CN201711107007A CN107918094A CN 107918094 A CN107918094 A CN 107918094A CN 201711107007 A CN201711107007 A CN 201711107007A CN 107918094 A CN107918094 A CN 107918094A
Authority
CN
China
Prior art keywords
power
measured
master control
power supply
board mount
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711107007.3A
Other languages
Chinese (zh)
Inventor
何雪梅
卓木富
卓杰伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TIANJIN AOMEI AUTOMATION SYSTEM Co Ltd
Original Assignee
TIANJIN AOMEI AUTOMATION SYSTEM Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TIANJIN AOMEI AUTOMATION SYSTEM Co Ltd filed Critical TIANJIN AOMEI AUTOMATION SYSTEM Co Ltd
Priority to CN201711107007.3A priority Critical patent/CN107918094A/en
Publication of CN107918094A publication Critical patent/CN107918094A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2801Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
    • G01R31/2806Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
    • G01R31/2808Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards

Abstract

The present invention proposes a kind of portable Electric Actuator veneer detection device and detection method, including power supply board mount, master control board mount, test power supply, LCD display, power socket board mount and multiple relay switches;The AC power of input is converted to DC test power supply by test power supply;The AC power of input connects one end of each relay switch;DC test power supply connecting test circuit and display screen;Power supply board mount connects power panel to be measured;Master control board mount is used to connect master control borad to be measured;Power socket board mount is used to connect bus board to be measured;Using the present apparatus, by bus board to be measured, master control borad to be measured and power panel to be measured, it is sequentially placed on corresponding stent, is tested successively by test circuit, realizes the whether qualified detection one by one of each board quality and electrical parameter.By the way that every detection parameters are shown using LCD display, the board failure reason of detection is found in time easy to staff, ensure product quality and save manpower.

Description

Portable Electric Actuator veneer detection device and its detection method
Technical field
The present invention relates to Electric Actuator detection technique field, more particularly to a kind of portable Electric Actuator veneer detection Device and its detection method.
Background technology
Electric Actuator is mainly made of two parts, and a part is control section, that is, electric control part, another part are Run part, that is, mechanical part.And the core of Electric Actuator is mainly control section, there are many circuits in control section Plate and wiring, the performance and quality of only every piece circuit board reach the quality that design requirement just can guarantee that product.When all Circuit board group is being debugged after dressing up cage plate, it is difficult to and it is which block plank therein goes wrong to detect, and to not conforming to The circuit boards of lattice carry out back and forth remove and install also can be invisible increase manpower.Therefore a kind of portable has been invented with regard to this problem Electric Actuator veneer detection device, it is very necessary individually to detect each piece of plank performance.
The content of the invention
The purpose of the present invention is intended at least solve one of described technological deficiency.
To achieve these goals, the embodiment of one aspect of the present invention provides a kind of portable Electric Actuator veneer detection Device, including power supply board mount, master control board mount, test power supply, LCD display, power socket board mount and multiple relays are opened Close;The test power supply is used to the AC power of input being converted to DC test power supply;The AC power connection of the input One end of each relay switch;The DC test power supply connecting test circuit and display screen;The power supply board mount is used for Connect power panel to be measured;The master control board mount is used to connect master control borad to be measured;The power socket board mount is used to connect to be measured Bus board;The test circuit is connected with power supply board mount, master control board mount and power socket board mount respectively, described to be measured total Line plate, master control borad to be measured and power panel to be measured, are sequentially placed on corresponding stent, test circuit is tested successively, described Test circuit is used to export test parameter, and the parameter tested is sent to LCD display and shows detection parameters.
Preferably, the power supply board mount includes 220V power supplys board mount and 380V power supply board mounts, the 220V power supplys Board mount connects 220V power panels to be measured, and the 380V power supplys board mount connects 380V power panels to be measured;The 380V power panels Stent connects the other end of relay switch;The relay switch connects 380V externally fed power supplys.
Further, multiple relay switches at least set most two, and two relay switches connect electricity respectively Source covers board mount and 380V power supply board mounts.
Preferably, the master control board mount includes the first master control board mount and the second master control board mount;First master control Board mount and the second master control board mount are respectively by connecting power switch connecting test power supply;The first master control board mount connection First master control display board to be measured, the second master control board mount connect the second master control display board to be measured.
Preferably, the power socket board mount connects the first profibus bus boards to be measured and to be measured second respectively Profibus bus boards.
Further, the test circuit includes motor control unit, voltage conversion unit, signal output unit;It is described Voltage conversion unit is used to connect DC test power supply, and DC test power supply is converted into the work electricity of each circuit board to be measured Source, described signal output unit one end connect the output terminal of each circuit board, other end connection LCD display, for will be each Detection signal output to the LCD display of circuit board is shown.
The present invention also provides a kind of portable Electric Actuator veneer detection method, comprise the following steps:
Step S1, master control borad is placed on by what master control display board to be measured, power panel to be measured and bus board to be measured were corresponding in turn to On stent, power supply board mount and power socket board mount, master control display board, power panel to be measured and the bus board to be measured difference to be measured It is connected with test circuit;
The AC power of input is converted to DC test power supply by step S2, test power supply;The AC power of input is at the same time Connect one end of multiple relay switches;
Step S3, the DC test power supply is connected with test circuit, test circuit output test parameter, and by institute The parameter of test sends to LCD display and shows detection parameters.
Preferably, the detection parameters that the LCD display is shown include situation:
1st, when testing power panel:LCD display display output voltage range, output waveform, relay-indicating light are shown Normally;
2nd, when testing master control display board:LCD display display output voltage range, output waveform duty cycle,
3rd, when testing bus:LED display uses subtitle form, exports testing result.
A kind of the portable Electric Actuator veneer detection device and its detection method of offer according to embodiments of the present invention, Compared to the existing detection means by Electric Actuator circuit board, at least have the advantages that:
1st, using the present apparatus, bus board to be measured, master control borad to be measured and power panel to be measured are sequentially placed in corresponding stent On, tested successively by test circuit, realize the whether qualified detection one by one of each board quality and electrical parameter.
2nd, by the way that every detection parameters are shown using LCD display, detection is found in time easy to staff Board failure reason, ensures product quality and saves manpower.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment Substantially and it is readily appreciated that, wherein:
Fig. 1 is a kind of schematic diagram of portable Electric Actuator veneer detection device provided by the invention:
Fig. 2 is a kind of flow chart of portable Electric Actuator veneer detection method provided by the invention;
In figure, 1, power supply board mount;2nd, master control board mount;3rd, power supply is tested;4th, LCD display;5th, power socket board mount; 6th, relay switch;
Embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
As shown in Figure 1, a kind of portable Electric Actuator veneer detection device of the embodiment of the present invention, including power panel branch Frame 1, master control board mount 2, test power supply 3, LCD display 4, power socket board mount 5 and multiple relay switches 6;Test power supply 3 For the AC power of input to be converted to DC test power supply 3;The AC power of input connects the one of each relay switch 6 End;3 connecting test circuit of DC test power supply and LCD display 4;Power supply board mount 1 is used to connect power panel to be measured;Master control borad Stent 2 is used to connect master control borad to be measured;Power socket board mount 5 is used to connect bus board to be measured;Test circuit respectively with power panel Stent 1, master control board mount 2 are connected with power socket board mount 5, bus board, master control borad to be measured and power panel to be measured to be measured, successively It is positioned on corresponding stent, test circuit is tested successively, test circuit is used to export test parameter, and will be tested Parameter sends to LCD display 4 and shows detection parameters.
Power supply board mount 1 includes 220V power supplys board mount and 380V power supply board mounts, and the connection of 220V power supplys board mount is to be measured 220V power panels, 380V power supplys board mount connect 380V power panels to be measured;380V power supplys board mount connects the another of relay switch 6 One end;Relay switch 6 connects 380V externally fed power supplys.
Multiple relay switches 6 at least set most two, and two relay switches 6 connect 5 He of power socket board mount respectively 380V power supply board mounts.
Master control board mount 2 includes the first master control board mount and the second master control board mount;First master control board mount and the second master Board mount is controlled respectively by connecting power switch connecting test power supply 3;First master control board mount 2 connects the first master control to be measured and shows Plate, the second master control board mount 2 connect the second master control display board to be measured.
Power socket board mount 5 connects the first profibus bus boards to be measured and the 2nd profibus bus boards to be measured respectively.
Test circuit includes motor control unit, voltage conversion unit, signal output unit;Voltage conversion unit is used to connect DC test power supply 3 is connect, and DC test power supply 3 is converted into the working power of each circuit board to be measured, signal output unit One end connects the output terminal of each circuit board, other end connection LCD display 4, for the detection signal of each circuit board is defeated Go out to LCD display 4 and show.
In one embodiment of the invention
Detection for 380V power panels, detection process are as follows:
First, external 380V exchanges supply electricity to power panel to be detected and 220V turns the single channel out-put supply module confession of 24V Electricity, supplies electricity to test circuit power supply by power module output 24V direct currents, detection parameters is shown by LCD display.It can be shown in LCD Show screen display 1) power panel 24V voltage outputs;2) power panel 5V voltage outputs;3) power panel optocoupler output waveform;4) motor Rotating control signal exports.The normal condition of wherein each parameter is as follows:1) 24V voltage output ranges:20V-26V;2) 5V electricity Press output area:4.8V-5.4V;3) optocoupler output waveform:A, B two-way waveform is peak width 9ms, the square wave of the wide 11ms of paddy, and two Road waveform has phase difference;4) motor positive and inverse control signal:See corresponding two relay-indicating lights.
Detection for 220V power panels, detection process are as follows:
Operation principle:External 220V exchanges supply electricity to power panel to be detected and 220V turns the single channel out-put supply mould of 24V Block is powered, and supplies electricity to test circuit power supply by power module output 24V direct currents, detection parameters are shown by LCD display.Can be 1) power panel 24V voltage outputs are shown on LCD display;2) power panel 5V voltage outputs;3) motor positive and inverse control letter is detected Number output.The normal condition of wherein each parameter is as follows:1) 24V voltage output ranges:20V-26V;2) 5V voltage output ranges: 4.8V-5.4V;3) motor positive and inverse control signal:See corresponding two relay-indicating lights.
Detection for the first master control display board and the second master control display board, that is, AM5/AM6 master control display boards, detection process It is as follows:
External 220V exchange supplies electricity to the power supply of AM5/AM6 power panels cage plate, is powered by power supply cage plate to display screen and shows ginseng Number.It is whether normal that AM5/AM6 registerings display screen can be detected.
It is as follows for the detection process of AM5/AM6profibus bus boards:
Operation principle:External 220V exchanges supply electricity to the power supply of power socket plate, and AM5/AM6profibus buses are given by power supply cage plate Test board is powered, and relevant parameter is shown by power supply cage plate display screen.AM5/AM6profibus bus boards can be detected whether just Often.Occur " Not connected " or " Unknown errror ", do not show communication below the power supply cage plate display screen curtain Failure is normal condition.
As shown in Fig. 2, the present invention also provides a kind of portable Electric Actuator veneer detection method, comprise the following steps:
Step S1, master control borad is placed on by what master control display board to be measured, power panel to be measured and bus board to be measured were corresponding in turn to On stent, power supply board mount and power socket board mount, master control display board, power panel to be measured and bus board to be measured to be measured respectively with survey Try circuit connection;
The AC power of input is converted to DC test power supply by step S2, test power supply;The AC power of input is at the same time Connect one end of multiple relay switches;
Step S3, DC test power supply is connected with test circuit, test circuit output test parameter, and will be tested Parameter send to LCD display show detection parameters.
Preferably, the detection parameters that LCD display is shown include situation:
1st, when testing power panel:LCD display display output voltage range, output waveform, relay-indicating light are shown Normally;
2nd, when testing master control display board:LCD display display output voltage range, output waveform duty cycle,
3rd, when testing bus:LED display uses subtitle form, exports testing result.
In one embodiment of the invention
Detection for 380V power panels, detection process are as follows:
First, external 380V exchanges supply electricity to power panel to be detected and 220V turns the single channel out-put supply module confession of 24V Electricity, supplies electricity to test circuit power supply by power module output 24V direct currents, detection parameters is shown by LCD display.It can be shown in LCD Show screen display 1) power panel 24V voltage outputs;2) power panel 5V voltage outputs;3) power panel optocoupler output waveform;4) motor Rotating control signal exports.The normal condition of wherein each parameter is as follows:1) 24V voltage output ranges:20V-26V;2) 5V electricity Press output area:4.8V-5.4V;3) optocoupler output waveform:A, B two-way waveform is peak width 9ms, the square wave of the wide 11ms of paddy, and two Road waveform has phase difference;4) motor positive and inverse control signal:See corresponding two relay-indicating lights.
Detection for 220V power panels, detection process are as follows:
Operation principle:External 220V exchanges supply electricity to power panel to be detected and 220V turns the single channel out-put supply mould of 24V Block is powered, and supplies electricity to test circuit power supply by power module output 24V direct currents, detection parameters are shown by LCD display.Can be 1) power panel 24V voltage outputs are shown on LCD display;2) power panel 5V voltage outputs;3) motor positive and inverse control letter is detected Number output.The normal condition of wherein each parameter is as follows:1) 24V voltage output ranges:20V-26V;2) 5V voltage output ranges: 4.8V-5.4V;3) motor positive and inverse control signal:See corresponding two relay-indicating lights.
Detection for the first master control display board and the second master control display board, that is, AM5/AM6 master control display boards, detection process It is as follows:
External 220V exchange supplies electricity to the power supply of AM5/AM6 power panels cage plate, is powered by power supply cage plate to display screen and shows ginseng Number.It is whether normal that AM5/AM6 registerings display screen can be detected.
It is as follows for the detection process of AM5/AM6profibus bus boards:
Operation principle:External 220V exchanges supply electricity to the power supply of power socket plate, and AM5/AM6profibus buses are given by power supply cage plate Test board is powered, and relevant parameter is shown by power supply cage plate display screen.AM5/AM6profibus bus boards can be detected whether just Often.Occur " Not connected " or " Unknown errror ", do not show communication below the power supply cage plate display screen curtain Failure is normal condition.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms is not Necessarily refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any One or more embodiments or example in combine in an appropriate manner.
Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art are not departing from the principle of the present invention and objective In the case of above-described embodiment can be changed within the scope of the invention, change, replace and modification.The scope of the present invention By appended claims and its equivalent limit.

Claims (8)

  1. A kind of 1. portable Electric Actuator veneer detection device, it is characterised in that including power supply board mount, master control board mount, Test power supply, LCD display, power socket board mount and multiple relay switches;
    The test power supply is used to the AC power of input being converted to DC test power supply;The AC power connection of the input One end of each relay switch;The DC test power supply connecting test circuit and display screen;The power supply board mount is used for Connect power panel to be measured;The master control board mount is used to connect master control borad to be measured;The power socket board mount is used to connect to be measured Bus board;
    The test circuit is connected with power supply board mount, master control board mount and power socket board mount respectively, the bus to be measured Plate, master control borad to be measured and power panel to be measured, are sequentially placed on corresponding stent, and test circuit is tested successively, the survey Examination circuit is used to export test parameter, and the parameter tested is sent to LCD display and shows detection parameters.
  2. 2. portable Electric Actuator veneer detection device according to claim 1, it is characterised in that the power panel branch Frame includes 220V power supplys board mount and 380V power supply board mounts, and the 220V power supplys board mount connects 220V power panels to be measured, institute State 380V power supplys board mount and connect 380V power panels to be measured;The other end of the 380V power supplys board mount connection relay switch; The relay switch connects 380V externally fed power supplys.
  3. 3. portable Electric Actuator veneer detection device according to claim 2, it is characterised in that multiple relays Device switch at least sets most two, and two relay switches connect power socket board mount and 380V power supply board mounts respectively.
  4. 4. portable Electric Actuator veneer detection device according to claim 1, it is characterised in that the master control borad branch Frame includes the first master control board mount and the second master control board mount;The first master control board mount and the second master control board mount lead to respectively Cross connection power switch connecting test power supply;The first master control board mount connection the first master control display board to be measured, described second Master control board mount connects the second master control display board to be measured.
  5. 5. portable Electric Actuator veneer detection device according to claim 1, it is characterised in that the power supply cage plate Stent connects the first profibus bus boards to be measured and the 2nd profibus bus boards to be measured respectively.
  6. 6. portable Electric Actuator veneer detection device according to claim 3, it is characterised in that the test circuit Including motor control unit, voltage conversion unit, signal output unit;The voltage conversion unit is used to connect DC test electricity Source, and DC test power supply is converted into the working power of each circuit board to be measured, signal output unit one end connection is each The output terminal of a circuit board, other end connection LCD display, for the detection signal output of each circuit board to LCD to be shown Screen display.
  7. 7. a kind of portable Electric Actuator veneer detection method, it is characterised in that comprise the following steps:
    Step S1, by master control display board to be measured, power panel to be measured and bus board to be measured be corresponding in turn to be placed on master control board mount, On power supply board mount and power socket board mount, master control display board, power panel to be measured and the bus board to be measured to be measured respectively with survey Try circuit connection;
    The AC power of input is converted to DC test power supply by step S2, test power supply;The AC power of input connects at the same time One end of multiple relay switches;
    Step S3, the DC test power supply is connected with test circuit, test circuit output test parameter, and will be tested Parameter send to LCD display show detection parameters.
  8. 8. portable Electric Actuator veneer detection method according to claim 7, it is characterised in that the LCD is shown The detection parameters of screen display include situation:
    Situation one, when testing power panel:LCD display display output voltage range, output waveform, relay-indicating light are shown Normally;
    Situation two, when testing master control display board:LCD display display output voltage range, output waveform duty cycle,
    Situation three, when testing bus:LED display uses subtitle form, exports testing result.
CN201711107007.3A 2017-11-10 2017-11-10 Portable Electric Actuator veneer detection device and its detection method Pending CN107918094A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711107007.3A CN107918094A (en) 2017-11-10 2017-11-10 Portable Electric Actuator veneer detection device and its detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711107007.3A CN107918094A (en) 2017-11-10 2017-11-10 Portable Electric Actuator veneer detection device and its detection method

Publications (1)

Publication Number Publication Date
CN107918094A true CN107918094A (en) 2018-04-17

Family

ID=61896184

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711107007.3A Pending CN107918094A (en) 2017-11-10 2017-11-10 Portable Electric Actuator veneer detection device and its detection method

Country Status (1)

Country Link
CN (1) CN107918094A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1349329A (en) * 2000-10-18 2002-05-15 深圳市中兴通讯股份有限公司上海第二研究所 Universal user board testing equipment
CN201464915U (en) * 2009-04-27 2010-05-12 上海闻涛电子科技有限公司 Special detection device of control circuit board
WO2015049333A1 (en) * 2013-10-02 2015-04-09 Tyco Electronics Uk Ltd. Automated high frequency test station
CN205160798U (en) * 2015-11-27 2016-04-13 贵州航天天马机电科技有限公司 Radio communication self -checking system
CN105929268A (en) * 2016-04-18 2016-09-07 中广核核电运营有限公司 Intelligent electric head power supply board stability detection system and method
CN106494459A (en) * 2016-12-29 2017-03-15 河南思维自动化设备股份有限公司 LKJ assembly detection apparatus
CN207318663U (en) * 2017-11-10 2018-05-04 天津奥美自动化系统有限公司 Portable electric actuator veneer detection device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1349329A (en) * 2000-10-18 2002-05-15 深圳市中兴通讯股份有限公司上海第二研究所 Universal user board testing equipment
CN201464915U (en) * 2009-04-27 2010-05-12 上海闻涛电子科技有限公司 Special detection device of control circuit board
WO2015049333A1 (en) * 2013-10-02 2015-04-09 Tyco Electronics Uk Ltd. Automated high frequency test station
CN205160798U (en) * 2015-11-27 2016-04-13 贵州航天天马机电科技有限公司 Radio communication self -checking system
CN105929268A (en) * 2016-04-18 2016-09-07 中广核核电运营有限公司 Intelligent electric head power supply board stability detection system and method
CN106494459A (en) * 2016-12-29 2017-03-15 河南思维自动化设备股份有限公司 LKJ assembly detection apparatus
CN207318663U (en) * 2017-11-10 2018-05-04 天津奥美自动化系统有限公司 Portable electric actuator veneer detection device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李泽军, 中国科学技术大学出版社 *

Similar Documents

Publication Publication Date Title
CN2881652Y (en) Universal test interface equipment and its universal test system
CN202583431U (en) Power supply aging rack and power supply aging system thereof
US8994388B2 (en) Low-voltage testing device for high-voltage frequency converter of serial superposition voltage type
CN100406899C (en) Apparatus for testing electric power system
CN100595597C (en) Lightning arrester various waveform aging test device
CN201032570Y (en) Household appliances computer plate component ordinary fault detection maintenance simulating device
CN207318663U (en) Portable electric actuator veneer detection device
CN210038541U (en) Function test system of motor controller PCBA board
CN107918094A (en) Portable Electric Actuator veneer detection device and its detection method
CN107703440B (en) Automatic test circuit of power converter
CN203385804U (en) Infrared touch screen aging device
CN206450798U (en) A kind of device for fast detecting of MCC cabinets drawer failure
CN203084104U (en) OTP burning and upper/lower-limit voltage detecting system of liquid crystal display module
CN205826811U (en) A kind of aging testing system
CN103792938A (en) Complete machine inspection platform for controller of electric car
CN105565090B (en) Test pill
CN204008900U (en) Energy efficiency testing device
CN208026838U (en) The aging equipment of automatic change-over
CN219448904U (en) Elevator control cabinet detection equipment and system
CN104345242A (en) Die-cutting machine electric cabinet test device
CN104849584A (en) System and method for functional test of overload protective card
CN2890884Y (en) Universal function testing device for frequency conversion air conditioner production line
CN104730444A (en) Multifunctional LED lamp test machine
CN106019647B (en) Liquid crystal module 1-wire writing system and method
CN211426671U (en) Testing device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination