CN109961677A - A kind of Electric Traction teaching, training equipment - Google Patents
A kind of Electric Traction teaching, training equipment Download PDFInfo
- Publication number
- CN109961677A CN109961677A CN201711342126.7A CN201711342126A CN109961677A CN 109961677 A CN109961677 A CN 109961677A CN 201711342126 A CN201711342126 A CN 201711342126A CN 109961677 A CN109961677 A CN 109961677A
- Authority
- CN
- China
- Prior art keywords
- travel switch
- electrical connection
- contactor
- screw component
- connection plate
- 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
Links
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/188—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for motors; for generators; for power supplies; for power distribution
Landscapes
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Algebra (AREA)
- Power Engineering (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Manipulator (AREA)
Abstract
The present invention discloses a kind of Electric Traction teaching, training equipment, it includes mounting base and the switch socket that is respectively arranged on mounting plate, transformer, Switching Power Supply, frequency converter, mechanical action module, electric control module and electrical connection plate, switch socket respectively with transformer, Switching Power Supply and frequency converter electrical connection, transformer, Switching Power Supply and frequency converter are connect with electrical connection plate respectively, mechanical action module includes screw component, location guide, three-phase motor, slide unit and electromagnet, screw component and location guide are arranged in parallel on mounting base, one end of three-phase motor and one end of screw component connect, three-phase motor is connect with electrical connection plate, one end of slide unit is set on screw component, its other end is sheathed on location guide, electromagnet is set to slide unit, electric control module includes be set to mounting plate One A.C. contactor and the second A.C. contactor, the first A.C. contactor are electrically connected with electrical connection plate respectively with the second A.C. contactor.
Description
Technical field
The present invention relates to teaching equipment technical fields, and in particular, to a kind of Electric Traction teaching, training equipment.
Background technique
Existing Electric Traction teaching equipment is generally cabinet type design, and volume is big, is not easy to the space benefit in the laboratory
With, while it is much to be more than human safety voltage using the three phase mains and 110V control circuit voltage of 380V, so that learning
Life exists during teaching, training because electric shock leads to dead security risk.And existing Electric Traction teaching equipment one
As can be only done single Project Training, when if desired carrying out multiple Project Trainings, need mating a variety of corresponding Electric Tractions
Teaching equipment causes educational costs high, is unfavorable for the development of teaching.
Summary of the invention
In view of the deficiencies of the prior art, the present invention, which provides, a kind of designs simple, at low cost, highly-safe Electric Traction religion
Learn training apparatus.
A kind of Electric Traction teaching, training equipment disclosed by the invention, comprising: mounting base and be respectively arranged at installation
Switch socket, transformer, Switching Power Supply, frequency converter, mechanical action module, electric control module and electrical connection plate on plate；
Switch socket is electrically connected with transformer, Switching Power Supply and frequency converter respectively；
Transformer, Switching Power Supply and frequency converter are electrically connected with electrical connection plate respectively；
Mechanical action module includes: screw component, location guide, three-phase motor, slide unit and electromagnet；Screw component and
Location guide is arranged in parallel on mounting base；One end of three-phase motor and one end of screw component connect；Three-phase motor
It is electrically connected with electrical connection plate；One end of slide unit is set on screw component, and the other end is sheathed on location guide；Electromagnet is set
It is placed on slide unit；
Electric control module includes: the first A.C. contactor and the second A.C. contactor being set on mounting plate；The
One A.C. contactor is electrically connected with electrical connection plate respectively with the second A.C. contactor.
According to an embodiment of the present invention, mechanical action module further include: the encoder and meter being set on mounting plate
Number device；Encoder and screw component are connected far from one end of three-phase motor；Encoder, counter and frequency converter are successively electrically connected
It connects.
According to an embodiment of the present invention, mechanical action module further include: afterwards limit travel switch, origin travel switch with
And preceding limit travel switch；Travel switch, origin travel switch and preceding limit travel switch are limited afterwards along the side for being parallel to screw component
To the side for being set in turn in screw component；Travel switch, origin travel switch and preceding limit travel switch are limited afterwards positioned at same
On straight line；Travel switch, origin travel switch and preceding limit travel switch is limited afterwards to connect with electrical connection plate respectively.
According to an embodiment of the present invention, electric control module further include: be set at least one on mounting plate
Between relay；At least one intermediate relay is electrically connected with electrical connection plate.
According to an embodiment of the present invention, electric control module further include: be set to timer on mounting plate；Timer
It is electrically connected with electrical connection plate.
According to an embodiment of the present invention, Electric Traction teaching, training equipment further include: the heat being set on mounting plate
Relay；Electrothermal relay is electrically connected with three-phase motor and electrical connection plate.
The beneficial effect that the present invention is different from the prior art is: Electric Traction teaching, training equipment of the invention, which is equipped with, to be mentioned
The Switching Power Supply of transformer and low-voltage direct for low-voltage alternating-current makes Electric Traction teaching, training equipment of the invention by meeting
The low-tension supply of human safety voltage drives, and eliminates the security risk that student gets an electric shock and dies, at the same by mechanical action module and
The achievable a variety of various teaching tasks of the cooperation of electric control module reduce the investment of educational costs, promote Electric Traction teaching
Development.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of Electric Traction teaching, training equipment in embodiment.
Description of symbols: 101, mounting base；102, switch socket；103, transformer；104, Switching Power Supply；105, become
Frequency device；106, mechanical action module；107, electric control module；108, it is electrically connected plate；1011, upper plate；1012, indsole
Plate；1013, lower plate；1014, cable hole；10601, screw component；10602, location guide；10603, three-phase motor；
10604, slide unit；10605, electromagnet；106011, the first driving wheel；106031, the second driving wheel；106012, screw rod；1071,
First A.C. contactor；1072, the second A.C. contactor；1073, third A.C. contactor；10606, encoder；10607, it counts
Number device；106013, synchronizing wheel；106061, third driving wheel；1075, electrothermal relay；1076, intermediate relay；10608, it restricts driving
Cheng Kaiguan；10609, origin travel switch；10610, preceding limit travel switch；106041, limited post；10611, workpiece placement plate.
Specific embodiment
Multiple embodiments of the invention will be disclosed with schema below, as clearly stated, the details in many practices
It will be explained in the following description.It should be appreciated, however, that the details in these practices is not applied to limit the present invention.Also
It is to say, in some embodiments of the invention, the details in these practices is non-essential.In addition, for the sake of simplifying schema,
Some known usual structures and component will be painted it in the drawings in simply illustrative mode.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, not especially censure
The meaning of order or cis-position, also non-to limit the present invention, the component described just for the sake of difference with same technique term
Or operation, it is not understood to indicate or imply its relative importance or implicitly indicates the number of indicated technical characteristic
Amount." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one of the features.In addition, each
Technical solution between a embodiment can be combined with each other, but must can be implemented as base with those of ordinary skill in the art
Plinth will be understood that the combination of this technical solution is not present when conflicting or cannot achieve when occurs in the combination of technical solution,
Also not the present invention claims protection scope within.
Embodiment:
It please refers to shown in Fig. 1, is the structural schematic diagram of Electric Traction teaching, training equipment in embodiment.
The present embodiment provides a kind of Electric Traction teaching, training equipment comprising mounting base 101, becomes switch socket 102
Depressor 103, Switching Power Supply 104, frequency converter 105, mechanical action module 106, electric control module 107 and electrical connection plate
108.Switch socket 102, transformer 103, Switching Power Supply 104, frequency converter 105, mechanical action module 106, electric control module
107 and electrical connection plate 108 be set on mounting base 101, switch socket 102 respectively with transformer 103, Switching Power Supply 104
And frequency converter 105 is electrically connected, transformer 103, Switching Power Supply 104 and frequency converter 105 are electrically connected with electrical connection plate 108 respectively,
Wherein, switch socket 102 is three-pin socket, is provided with the control switch 1021 for controlling on/off, transformer 103 is defeated
The AC power source of AC24V out, Switching Power Supply 104 exports the DC power supply of DC24V, and frequency converter 105 exports the three-phase electricity of AC36V
Source.In the present embodiment, mounting base 101 includes upper plate 1011, insole board 1012 and the lower plate 1013 successively pressed,
Wherein, multiple cable holes 1014, shape between upper plate 1011, insole board 1012 and lower plate 1013 is distributed in upper plate 1011
At a cabling space (not shown) for winding displacement, the connecting line between each component can be by cable hole 1014 in cabling
Space (not shown) carries out winding displacement, so that the overall appearance of Electric Traction teaching, training equipment is neat and artistic, and prevents
Connecting line influences the actuation between each component.Wherein, it is electrically connected on plate 108 and is provided with multiple individual electronic components, and
Electrical connection plate 108 can be attached with the programmable PLC control panel of any model on the market, by programmable PLC control
The corresponding programming of making sheet controls the cooperation actuation between each component, completes each individual training project or multiple combined trainings
Instruction project.
Mechanical action module 106 includes screw component 10601, location guide 10602, three-phase motor 10603, slide unit
10604 and electromagnet 10605.Screw component 10601 and location guide 10602 are arranged in parallel on mounting base 101,
One end of three-phase motor 10603 is connect with one end of screw component 10601, wherein one end of screw component 10601 is equipped with first
Driving wheel 106011, shaft one end of three-phase motor 10603 are provided with the second driving wheel 106031, the first driving wheel 106011 with
The engagement of second driving wheel 106031, keeps the transmission of screw component 10601 and three-phase motor 10603 between the two more accurate.Three
Phase motor 10603 is electrically connected with electrical connection plate 108.In the present embodiment, screw component 10601 is by screw rod 106012 and setting
On screw rod 106012 nut ((not shown) constitute, screw rod 106012 rotation will drive nut ((not shown) in
It is moved on screw rod 106012, and one end of slide unit 10604 is set in nut (not shown), the other end is sheathed on fixation
Guide rod 10602, electromagnet 10605 are set on slide unit 10604.The rotating forward that three-phase motor 10603 passes through driving screw rod 106012
Or overturning drives nut (not shown) to move on screw rod 106012, to drive slide unit 10604 along screw component 10601
Extending direction it is mobile, the movement of further drive electromagnet 10605.Three-phase synchronous can be used in above-mentioned three-phase motor 10603
One of motor or threephase asynchronous machine, but three characteristics of the middle term asynchronous machine has advantage easy to repair and at low cost, this implementation
Three-phase motor 10603 preferentially uses threephase asynchronous machine in example.
Electric control module 107 includes that the first A.C. contactor 1071, second exchange being set on mounting base 101 connects
Tentaculum 1072 and third A.C. contactor 1073.First A.C. contactor 1071, the second A.C. contactor 1072 and third
A.C. contactor 1073 is electrically connected with electrical connection plate 108 respectively.
Further, mechanical action module 1060 further includes the encoder 10606 being set on mounting base 101 and counts
Device 10607.Encoder 10606 is connect with screw component 10601 far from one end of three-phase motor 10603, encoder 10606, meter
Number device 10607 and frequency converter 105 are sequentially connected electrically.Wherein, screw rod 106012 is provided with far from one end of three-phase motor 10603
Synchronizing wheel 106013, one end of encoder 10606 are provided with third driving wheel 106061, synchronizing wheel 106013 and third driving wheel
106061 are sequentially connected by belt (not shown).Screw rod 106012 drives third driving wheel by synchronizing wheel 106013
106061 synchronous rotaries rotate encoder 10606 and issue signal to counter 10607, and counter 10607 receives letter
Number and count, after count value reaches preset value counter 10607 to frequency converter 105 issue signal, make frequency converter stop fortune
Row, to control the stop position of slide unit 10604.
Further, after mechanical action module 1060 further includes limit travel switch 10608, origin travel switch 10609 with
And preceding limit travel switch 10610.Travel switch 10608, origin travel switch 10609 and preceding limit travel switch 10610 are limited afterwards
The side of screw component 10601 is set in turn in along the direction for being parallel to screw component 10601, it is rear to limit travel switch 10608, original
Point travel switch 10609 and preceding limit travel switch 10610 are located along the same line, rear to limit travel switch 10608, origin stroke
Switch 10609 and preceding limit travel switch 10610 are electrically connected with electrical connection plate 108 respectively.A limit is provided on slide unit 10604
Position column 106041, when slide unit 10604 after being respectively moved to corresponding on screw rod 10601 open by limit travel switch 10608, origin stroke
The position of 10609 and preceding limit travel switch 10610 is closed, slide unit 10604 triggers three switches by limited post 106041 respectively.
When limiting travel switch 10608 and preceding limit travel switch 10610 after the triggering of limited post 106041, three-phase motor is disconnected automatically
10603 power supply prevents slide unit 10604 from breaking beyond moving range.Simultaneously by programmable PLC control panel, using rear
Limit travel switch 10608 and preceding limit travel switch 10610 control slide unit 10604 and do automatic round-trip training between two switches
Instruction project.The top of preceding limit travel switch 10610 is additionally provided with a workpiece placement plate 10611, and workpiece is placed in workpiece and is placed
On plate 10611, so that it is parked in the same position of workpiece the precise positioning control of slide unit 29 by programmable PLC control panel, connect
Flexible workpiece being released of control electromagnet 10605, the training project of slide unit location control.
Further, electric control module 107 further includes the timer 1074 being set on mounting base 101, timer
1074 are electrically connected with electrical connection plate 108.While in order to expand the function of Electric Traction teaching, training equipment of the invention, electrically
Control module 107 is additionally provided at least one intermediate relay 1076, for increasing the function of control circuit.Electric power of the invention
It drags teaching, training equipment and passes through the first A.C. contactor 1071 of electric control module 107, the second A.C. contactor 1072, the
Three A.C. contactors 1073, timer 1074, intermediate relay 1076 are matched with the various components on electrical connection plate 108
Close the electrical control, it can be achieved that the precise positioning control such as the star delta reduced-voltage starting and timer 1074 of three-phase motor 10603
Training project.
Further, Electric Traction teaching, training equipment of the invention further include be set on mounting base 101 heat after
Electric appliance 1075.Electrothermal relay 1075 is electrically connected with three-phase motor 10603 and electrical connection plate 108.Heat is accessed in circuit loop
Relay 1075, and it is attached electrothermal relay 1075 and the coil windings of three-phase motor 10603, three-phase motor can be monitored
10603 working condition, when three-phase motor 10603 causes coil temperature to rise to preset temperature because of constant overload work,
Power supply is cut off, three-phase motor 10603 is made to stop working, provides protection for three-phase motor 10603.
Electric Traction teaching, training equipment of the invention can carry out the positive and negative of driving three-phase motor 1060 by two ways
Turn.First, being controlled in a manner of Electric Traction, specifically, by the first A.C. contactor 1071 and the second A.C. contactor
1072 are arranged with the connection of three-phase motor 10603 are as follows: it is both current respectively it is electric when, current direction is opposite.Pass through control first
A.C. contactor 1071 and the second A.C. contactor 1072 obtain electric situation, change the current direction of three-phase motor 10603, Jin Erfen
Not Kong Zhi three-phase motor 10603 rotating forward or reversion.Second, directly controlling the positive and negative of three-phase motor 10603 with frequency converter 105
Turn, specifically, passing through internal schema (control of modification 105 inner parameter of frequency converter) or external schema with frequency converter 105
(105 external cabling of frequency converter control) controls the positive and negative rotation of three-phase motor 10603, and repairing by 105 frequency of frequency converter
Change to change the revolving speed of three-phase motor 10603.
When carrying out teaching, training using Electric Traction teaching, training equipment of the invention, only need student by programmed
Programmable PLC control panel and electrical connection plate 108 are attached and complete the line of all correlation control units, to train
Student completes each individual training project or combined training project, to achieve the purpose that teaching, training.
In conclusion Electric Traction teaching, training equipment of the invention be equipped with provide low-voltage alternating-current transformer 103 and
The Switching Power Supply 104 of low-voltage direct makes Electric Traction teaching, training equipment of the invention by meeting the low of human safety voltage
Voltage source driving eliminates the security risk that student gets an electric shock and dies, while passing through mechanical action module 106 and electric control module
The 107 achievable a variety of different training projects of cooperation, reduce the investment of educational costs, promote the development of Electric Traction teaching.
The upper only embodiments of the present invention, are not intended to restrict the invention.For those skilled in the art
For, the invention may be variously modified and varied.All any modifications made in spirit and principles of the present invention are equal
Replacement, improvement etc., should all be included within scope of the presently claimed invention.
Claims (5)
1. a kind of Electric Traction teaching, training equipment characterized by comprising mounting base and be respectively arranged at the installation
Switch socket, transformer, Switching Power Supply, frequency converter, mechanical action module, electric control module and electrical connection on bottom plate
Plate；
The switch socket is electrically connected with the transformer, Switching Power Supply and frequency converter respectively；
The transformer, Switching Power Supply and frequency converter are electrically connected with the electrical connection plate respectively；
The mechanical action module includes: screw component, location guide, three-phase motor, slide unit and electromagnet；The screw rod group
Part and location guide are arranged in parallel on the mounting base；One end of the three-phase motor and the one of the screw component
End connection；The three-phase motor is electrically connected with the electrical connection plate；One end of the slide unit is set on the screw component,
Its other end is sheathed on the location guide；The electromagnet is set on the slide unit；
The electric control module includes: the first A.C. contactor being set on the mounting base, the second A.C. contactor
And third A.C. contactor；First A.C. contactor, the second A.C. contactor and third A.C. contactor respectively with
The electrical connection plate electrical connection.
2. Electric Traction teaching, training equipment according to claim 1, which is characterized in that the mechanical action module is also wrapped
It includes: the encoder and counter being set on the mounting base；The encoder and the screw component are far from the three-phase
One end of motor connects；The encoder, counter and frequency converter are sequentially connected electrically.
3. Electric Traction teaching, training equipment according to claim 1, which is characterized in that the mechanical action module is also wrapped
It includes: limiting travel switch, origin travel switch and preceding limit travel switch afterwards；It is described after limit travel switch, origin travel switch with
And preceding limit travel switch is set in turn in the side of the screw component along the direction for being parallel to the screw component；Limit after described
Travel switch, origin travel switch and preceding limit travel switch are located along the same line；Travel switch, origin stroke are limited after described
Switch and preceding limit travel switch are electrically connected with the electrical connection plate respectively.
4. Electric Traction teaching, training equipment according to claim 1, which is characterized in that the electric control module also wraps
It includes: the timer being set on the mounting base；The timer is electrically connected with the electrical connection plate.
5. Electric Traction teaching, training equipment according to any one of claims 1 to 4, which is characterized in that its further include: setting
Electrothermal relay on the mounting base；The electrothermal relay is electrically connected with the three-phase motor and electrical connection plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711342126.7A CN109961677A (en) | 2017-12-14 | 2017-12-14 | A kind of Electric Traction teaching, training equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711342126.7A CN109961677A (en) | 2017-12-14 | 2017-12-14 | A kind of Electric Traction teaching, training equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109961677A true CN109961677A (en) | 2019-07-02 |
Family
ID=67018339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711342126.7A Pending CN109961677A (en) | 2017-12-14 | 2017-12-14 | A kind of Electric Traction teaching, training equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109961677A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202584542U (en) * | 2012-03-24 | 2012-12-05 | 安徽理工大学 | Comprehensive practical training device of motor control system |
| CN203085063U (en) * | 2013-03-12 | 2013-07-24 | 日照港集团岚山港务有限公司 | Electrical dragging simulation training table |
| CN206134098U (en) * | 2016-07-01 | 2017-04-26 | 刘建 | Industrial automation teaching training equipment |
| CN206134097U (en) * | 2016-07-01 | 2017-04-26 | 刘建 | AC servo and pneumatic manipulator teaching training equipment |
-
2017
- 2017-12-14 CN CN201711342126.7A patent/CN109961677A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202584542U (en) * | 2012-03-24 | 2012-12-05 | 安徽理工大学 | Comprehensive practical training device of motor control system |
| CN203085063U (en) * | 2013-03-12 | 2013-07-24 | 日照港集团岚山港务有限公司 | Electrical dragging simulation training table |
| CN206134098U (en) * | 2016-07-01 | 2017-04-26 | 刘建 | Industrial automation teaching training equipment |
| CN206134097U (en) * | 2016-07-01 | 2017-04-26 | 刘建 | AC servo and pneumatic manipulator teaching training equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103413736B (en) | Automatic reclosing operating mechanism | |
| CN202906268U (en) | Electric operating device for switch cabinet handcart | |
| CN208873363U (en) | A kind of Electric Traction teaching, training equipment | |
| CN109961677A (en) | A kind of Electric Traction teaching, training equipment | |
| CN207489695U (en) | Switchgear operating device | |
| CN209675229U (en) | A kind of long-range switching off/on device for breaker in a row | |
| CN208225311U (en) | A kind of information intelligent comprehensive automation actual training device | |
| CN205654853U (en) | Automotive electronics gearshift | |
| CN204967683U (en) | Multifunctional motor control device | |
| CN209373910U (en) | A kind of electrical cabinet for practice teaching | |
| CN208766860U (en) | A kind of electromechanical integration practice teaching table | |
| CN208173511U (en) | A kind of high voltage relay | |
| CN201425592Y (en) | Miniature programme-controlled clamping device for circuit breaker | |
| CN204117392U (en) | Electromechanical integration actual training device | |
| CN2924217Y (en) | Valve electric actuator control circuit | |
| CN214752368U (en) | Low-voltage motor controlled multifunctional teaching table | |
| CN214560968U (en) | Low-voltage power-on/off robot execution device | |
| CN217787915U (en) | Real platform of instructing of link plate formula PLC programming control system | |
| CN209543631U (en) | A kind of Motor Control circuit actual training device | |
| CN105071722B (en) | Multifunctional motor control device | |
| CN203721464U (en) | Novel transformer capacity-adjusting switch | |
| CN203377187U (en) | Automatic reclosing operation mechanism | |
| CN203491679U (en) | Open-phase discriminating and protection circuit of three-phase power supply | |
| CN219609823U (en) | Practical training platform for control technology | |
| CN203520709U (en) | Rotating experiment table for physics |
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 |