CN206077239U - Elevator exchanges compound high-pressure frequency-conversion control panel - Google Patents
Elevator exchanges compound high-pressure frequency-conversion control panel Download PDFInfo
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- CN206077239U CN206077239U CN201621117457.1U CN201621117457U CN206077239U CN 206077239 U CN206077239 U CN 206077239U CN 201621117457 U CN201621117457 U CN 201621117457U CN 206077239 U CN206077239 U CN 206077239U
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Abstract
This utility model is related to a kind of elevator and exchanges compound high-pressure frequency-conversion control panel, including dual power supply high voltage vacuum switchgear cabinet（GA）, high voltage converter, low-tension supply switch board（DA）, operating console（PA）, high-voltage variable frequency power source switching cabinet（GH）Switch cabinet with frequency-converter power（BH）；The quantity of the high voltage converter is two, includes transformer case, power cabinet and switch board in every high voltage converter；The switch board control connection power cabinet, the operating console（PA）Switch cabinet with high-voltage variable frequency power source（GH）, frequency-converter power switching cabinet（BH）And switch board control connects, the power take-off of the power cabinet switches cabinet by frequency-converter power（BH）Connection elevator main motor.The control panel simple structure, it is easy to operate, once emerged in operation failure, another set of to put into operation, and it is safe and reliable.
Description
Technical field
This utility model is related to a kind of mine hoist control panel, and more particularly to a kind of elevator exchanges compound high pressure
Frequency conversion electrical control equipment.
Background technology
With the adjustment of mine and coal industry production capacity structure, production pattern there occurs change, renewal of the equipment require safety,
Reliability, economy, energy-saving and environmental protection.Especially with converter technique, it is desirable to, when the single control method of change breaks down, to being lifted
Machine work can not be impacted.
At present, mine and coal industry economic development rises successively, and the requirement of equipment and technology also increases, commonly used
Control panel do not adapt to the standard of production requirement from now on.See Fig. 1, particularly major part mine and mining listed corporations, adopt
Control panel, fault rate are high, are badly in need of a kind of technically reliable, and the easily operated mine hoist in scene exchanges compound high pressure
Frequency conversion electrical control equipment is substituting the defect of existing equipment technology.
The content of the invention
This utility model solves mine and coal industry now with elevator alternating current controlled and high-pressure frequency-conversion control panel skill
The deficiency of art, proposes that a kind of elevator exchanges compound high-pressure frequency-conversion control panel, and the equipment adopts two sets of all-digitized demodulator systems
System, two sets of high voltage converters of converted control control elevator work, are the safety of colliery, mining hoist after power switching
There is provided a kind of reliable control device.
In order to achieve the above object, this utility model adopts following technical scheme：
A kind of elevator exchanges compound high-pressure frequency-conversion control panel, including dual power supply high voltage vacuum switchgear cabinet（GA）, it is high
Voltage frequency changer, low-tension supply switch board（DA）And operating console（PA）, the low-tension supply switch board（DA）For operation control
Platform processed（PA）Working power is provided, also switches cabinet including high-voltage variable frequency power source（GH）Switch cabinet with frequency-converter power（BH）；The height
Voltage frequency changer includes the first high voltage converter (BP1) and the second high voltage converter (BP2), first high voltage converter（BP1）
Including the first transformer case（1）, the first power cabinet（3）And first switch board（5）, the second high voltage converter (BP2) bag
Include the second transformer case (2), the second power cabinet（4）And second switch board（6）；The dual power supply high voltage vacuum switchgear cabinet（GA）
Jing high-voltage variable frequency power sources switch cabinet（GH）, first, second transformer case（1、2）Transformer secondary coil given through phase shift respectively
First, second power cabinet（3、4）Power cell and first, second switch board（5、6）Power supply is provided；First, second control
Cabinet processed（5、6）Control respectively connects first, second power cabinet（3、4）, the frequency-converter power switching cabinet（BH）Also control connection the
First, the second power cabinet（3、4）；The operating console（PA）Switch cabinet with high-voltage variable frequency power source（GH）, frequency-converter power switching cabinet
（BH）And first, second switch board（5、6）Control connection, the dual power supply high voltage vacuum switchgear cabinet（GA）By voltage, electric current
Signal sends operating console to（PA）, first, second power cabinet（3、4）Power take-off by frequency-converter power switch
Cabinet（BH）Connection elevator main motor.
In leading-out terminal A, B, C connection high-voltage variable frequency power source switching cabinet (GH) of the dual power supply high voltage vacuum switchgear cabinet (GA)
First high-pressure vacuum contactor in portion（ZJ1）, the first high-pressure vacuum contactor（ZJ1）Leading-out terminal a, b, c connect second respectively
High-pressure vacuum contactor（ZJ2）And the 3rd high-pressure vacuum contactor（ZJ3）End of incoming cables, second and the 3rd high pressure vacuum contact
Device（ZJ2、ZJ3）Control loop connection permutator (HK1) P2, P3 end on, second and the 3rd high-pressure vacuum contactor
（ZJ2、ZJ3）Leading-out terminal a11, b11, c11, a22, b22, c22 correspondence access first, second transformer case（1、2）, described
First, the second transformer case（1、2）Inside be provided with n two secondary windings export respectively three-phase phase shifting voltage x current connect first respectively,
Second power cabinet（3、4）Interior power cell AFR, leading-out terminal U1, V1 after two groups of the folded ripple of n power cell AFR series connection,
W1, U2, V2, W2 connection frequency-converter power switching cabinet（BH）The the 4th and the 5th internal high-pressure vacuum contactor（ZJ4、ZJ5）, the 4th
With the 5th high-pressure vacuum contactor（ZJ4、ZJ5）Control loop connection permutator（HK1）P4, P5 end on, the 4th and
Five high-pressure vacuum contactors（ZJ4、ZJ5）Leading-out terminal be all connected to the 6th high-pressure vacuum contactor（ZJ6）On, the 6th high pressure is true
Empty catalyst（ZJ6）Leading-out terminal connection mine hoist main motor end of incoming cables U, V, W, the high-voltage variable frequency power source cuts
Change cabinet（GH）The first interior high-pressure vacuum contactor（ZJ1）Switch cabinet with frequency-converter power（BH）The 6th interior high-pressure vacuum contactor
（ZJ6）Control loop be connected respectively to controlling switch（BK）P1, P6 end on, the n be natural number.
The high-voltage variable frequency power source switches cabinet（GH）It is internally provided with the first high voltage isolator（GK1）, the first high pressure every
Leave pass（GK1）Middle-end connection dual power supply high voltage vacuum switchgear cabinet（GA）Leading-out terminal A, B, C, the first high voltage isolator
（GK1）Leading-out terminal a11, b11, c11 connect the first high voltage converter（BP1）, the first high voltage isolator（GK1）Another
Leading-out terminal a22, b22, c22 connect the second high voltage converter（BP2）；The frequency-converter power switches cabinet（BH）It is internally provided with second
High voltage isolator（GK2）, the second high voltage isolator（GK2）Middle-end connection mine hoist mair motor end of incoming cables U,
V, W, the second high voltage isolator（GK2）Leading-out terminal U1, V1, W1 connect the first high voltage converter（BP1）, the second high_voltage isolation
Switch（GK2）Another leading-out terminal U2, V2, W2 connect the second high voltage converter（BP2）.
First switch board（5）With the second switch board（6）Inside is respectively installed by a set of PWM control systems；The operation control
Platform processed（PA）Two sets of control signals share when by relay conversion；Elevator system (TC) work when produce hydraulic pressure, lubrication,
Oil pressure, speed, position, mechanical brake shoe, slack rope direction and the signal of conversion need to be shared, repeated ZJ respectively enters high-pressure frequency-conversion
Electric-control system I and high-pressure frequency-conversion electric-control system II.
The dual power supply high voltage vacuum switchgear cabinet（GA）Using TGZG-400 type high voltage vacuum switchgear cabinets, first, second is high
Voltage frequency changer（BP1、BP2）Using the folded ripple boost feedback high voltage converter of AC-DC-AC power unit series connection.
As a result of above-mentioned technical proposal, positive beneficial effect of the present utility model is：
The elevator that this utility model is provided exchanges compound high-pressure frequency-conversion control panel, independent each other automatically controlled by two sets
System is constituted, easy to operate, once high-voltage variable frequency power source is switched to fault-free system by the short time of breaking down in system operation,
Switch low-tension supply simultaneously to be cut to fault-free system, operating console and Frequency Converter Control simultaneously by repeat circuit and peripheral system
Change, it is another set of to put into operation, it is safe and reliable, it is ensured that the normal operation of production.Using the folded ripple of AC-DC-AC power unit series connection
The compound high voltage converter that pressure build-up technique is constituted, power supply adopt TGZG-400 type high voltage vacuum switchgear cabinets, using high pressure vacuum
Catalyst or high voltage isolator control conversion frequencies conversion, be colliery, mining hoist safely provided it is a kind of reliable
Control device.
Description of the drawings
Fig. 1 is the system pie graph of existing elevator electric control equipment；
Fig. 2 is the system pie graph that this utility model elevator exchanges compound high-pressure frequency-conversion control panel；
Fig. 3 is this utility model high-voltage variable frequency power source switching cabinet work change-over circuit；
Fig. 4 is this utility model frequency-converter power switching cabinet work change-over circuit；
Fig. 5 is this utility model high voltage converter system pie graph；
Fig. 6 is that this utility model high-voltage variable frequency power source switches cabinet manual switch circuit；
Fig. 7 is that this utility model frequency-converter power switches cabinet manual switch circuit；
Fig. 8 is high-voltage variable frequency power source switching cabinet internal conversion control switching circuit；
Fig. 9 is frequency-converter power switching cabinet internal conversion control switching circuit；
Figure 10 is this utility model elevator system signal relay schematic diagram.
Specific embodiment
This utility model is made with specific embodiment below in conjunction with the accompanying drawings and describing in further detail：
Embodiment one：Shown in Figure 2, this utility model elevator exchanges compound high-pressure frequency-conversion control panel, three-phase
High voltage power supply Jing dual power supply high voltage vacuum switchgear cabinet GA connection high-voltage variable frequency power source switching cabinet GH, and opened by dual power supply high pressure vacuum
Close Jing voltages, current transformer in cabinet GA operating console PA is given by voltage, current signal.High-voltage variable frequency power source switches cabinet GH
According to job requirement, high voltage power supply is sent to the first high voltage converter BP1 and the second high voltage converter BP2.First high voltage converter
BP1 and the in check requirements of the second high voltage converter BP2, the switching cabinet BH control elevator work of Jing frequency-converter powers.Three-phase low-voltage
380V Jing low-tension supply switch board DA attended operation control station PA, low-tension supply switch board DA can be divided into two, operating console
PA can also be divided into two；Two sets of control systems are housed inside operating console PA, each connect the first high voltage converter BP1 respectively
With the second high voltage converter BP2.Various analogue signals in scene and digital signal is repeated respectively enters operating console PA, referring to
Shown in Figure 10, require according to control, after process, give the first high voltage converter BP1 and the second high voltage converter BP2, adjust high pressure
Frequency converter frequency controls the operating rate of elevator, the operating console PA and high-voltage variable frequency power source switching cabinet GH, frequency conversion work(
Rate switching cabinet BH, the first switch board 5 and the control connection of the second switch board 6, in first switch board 5 and the second switch board 6
A set of PWM control systems are respectively installed in portion, respectively control the first power cabinet 3 of connection and the second power cabinet 4.
Referring to Fig. 3,4,5,8,9, three-phase 6KV or 10KV high voltage power supply accesses dual power supply high voltage vacuum switchgear cabinet GA, in cabinet
Equipped with integrated high-pressure vacuum circuit breaker, integrated high-pressure disconnecting switch, voltage, current transformer, comprehensive automation protection etc..
The first high pressure vacuum inside leading-out terminal A, B, C connection high-voltage variable frequency power source switching cabinet GH of dual power supply high voltage vacuum switchgear cabinet GA
Leading-out terminal a, b, c of catalyst ZJ1, the first high-pressure vacuum contactor ZJ1 connects the end of incoming cables of the second high-pressure vacuum contactor ZJ2
On, and connect the end of incoming cables of the 3rd high-pressure vacuum contactor ZJ3 by bus.Second high-pressure vacuum contactor ZJ2 and three-hypers
Pressure vacuum contactor ZJ3 enters three symmetrical silicon DSA that line side is connected between a, b, c, has obvious wave absorption to make to mains by harmonics
With.Leading-out terminal a11, b11, c11 of second high-pressure vacuum contactor ZJ2 connects the first transformer case 1, the 3rd high pressure vacuum contact
Leading-out terminal a22, b22, c22 of device ZJ3 connects the second transformer case 2, the second high-pressure vacuum contactor ZJ2 and the 3rd vacuum contact
On P2, P3 end of the control loop connection permutator HK1 of device ZJ3, the control loop connection of the first high-pressure vacuum contactor ZJ1
To on the P1 ends of controlling switch BK.N two secondary windings difference is provided with first transformer case 1 and the second transformer case 2
Output three-phase phase shifting voltage x current connects the power cell AFR in the first power cabinet 3 and the second power cabinet 4 respectively, and two groups of n is individual
The 4th high pressure vacuum inside leading-out terminal U1, V1, W1 connection frequency-converter power switching cabinet BH after the folded ripple of power cell AFR series connection connects
Tentaculum ZJ4, the 5th high-pressure vacuum contactor ZJ5 inside another group of leading-out terminal U2, V2, W2 connection frequency-converter power switching cabinet BH,
The control loop of the 4th high-pressure vacuum contactor ZJ4 and the 5th high-pressure vacuum contactor ZJ5 connects P4, P5 of permutator HK1
On end, the control loop of the 6th high-pressure vacuum contactor ZJ6 in frequency-converter power switching cabinet BH is connected to the P6 of controlling switch BK
On end, the leading-out terminal of the 4th high-pressure vacuum contactor ZJ4 and the 5th high-pressure vacuum contactor ZJ5 is all connected to the 6th fine vacuum and connects
On the end of incoming cables of tentaculum ZJ6, the inlet wire of the main motor of the leading-out terminal connection mine hoist of the 6th high-pressure vacuum contactor ZJ6
End U, V, W, the n are natural number.
During operation, controlling switch BK controls the line of the first high-pressure vacuum contactor ZJ1 and the 6th high-pressure vacuum contactor ZJ6
Enclose electric, the major loop of the first high-pressure vacuum contactor ZJ1 and the 6th high-pressure vacuum contactor ZJ6 is connected.Control permutator
HK1, makes the coil of the coil and the 4th high-pressure vacuum contactor ZJ4 of the second high-pressure vacuum contactor ZJ2 obtain electric, and the second high pressure is true
The major loop of empty catalyst ZJ2 and the 4th high-pressure vacuum contactor ZJ4 is connected.So, first, six, two, four high pressure vacuums contact
The corresponding main control loop closure of device, connects the working power and out-put supply of the first high voltage converter BP1, and and operational control
Control system in platform PA and low-tension supply switch board DA constitutes a complete hoist control system, works according to elevator
Operation process, reaches the purpose of safe, reliable, energy saving, environmental protection.
If the first high voltage converter BP1 breaks down, by aforesaid operations process, permutator HK1 need to be controlled only, make the
The coil of the coil and the 5th high-pressure vacuum contactor ZJ5 of three high-pressure vacuum contactor ZJ3 obtains electric, and now the second high pressure vacuum connects
Tentaculum ZJ2 and the 4th high-pressure vacuum contactor ZJ4 dead electricity disconnect.So, the corresponding main control of the three, the five high-pressure vacuum contactors
Circuit closed, connects the working power and out-put supply of the second high voltage converter BP2, and the first high voltage converter BP1 shuts down to be repaired.
Operation control system, changes to circuits such as work system signal and control function, safeguard protection, system operation sensors, both together
When change, make high-pressure frequency-conversion control panel of the present utility model reach the reliable, requirement of safe conversion and control.
Embodiment two：Referring to Fig. 6,7, operation switching may also be employed manually, artificial operation.The high-voltage variable frequency power source switching
Cabinet GH is internally provided with the first high voltage isolator GK1, the middle-end connection dual power supply high pressure vacuum of the first high voltage isolator GK1
Leading-out terminal a11, b11, c11 of leading-out terminal A, B, C of switch cubicle GA, the first high voltage isolator GK1 connects the first high-pressure frequency-conversion
Another leading-out terminal a22, b22, c22 of device BP1, the first high voltage isolator GK1 connects the second high voltage converter BP2；It is described
Frequency-converter power switching cabinet BH is internally provided with the second high voltage isolator GK2, the middle-end connection ore deposit of the second high voltage isolator GK2
Leading-out terminal U1, V1, W1 of end of incoming cables U, V, W of the mair motor of well elevator, the second high voltage isolator GK2 connects the first high pressure
Frequency converter B P1, another leading-out terminal U2, V2, W2 of the second high voltage isolator GK2 connect the second high voltage converter BP2, described
First high voltage isolator GK1 and the second high voltage isolator GK2 are the integrated design.Using process with reference to embodiment one,
By controlling the first high voltage isolator GK1 and the second high voltage isolator GK2, the first high voltage converter BP1 and the is realized
The switching control of two high voltage converter BP2.First high voltage isolator GK1 and the second high voltage isolator GK2 can be mounted in one
Inside cabinet.
The dual power supply high voltage vacuum switchgear cabinet GA adopts TGZG-400 type high voltage vacuum switchgear cabinets, the first high voltage converter
The compound high-pressure frequency-conversion that BP1, the second high voltage converter BP2 are constituted using the folded ripple pressure build-up technique of AC-DC-AC power unit series connection
Device.
Claims (5)
1. a kind of elevator exchanges compound high-pressure frequency-conversion control panel, including dual power supply high voltage vacuum switchgear cabinet（GA）, high pressure
Converter, low-tension supply switch board（DA）And operating console（PA）, the low-tension supply switch board（DA）For operational control
Platform（PA）Working power is provided, it is characterised in that：Also include that high-voltage variable frequency power source switches cabinet（GH）Switch cabinet with frequency-converter power
（BH）；The high voltage converter includes the first high voltage converter (BP1) and the second high voltage converter (BP2), first high pressure
Converter（BP1）Including the first transformer case（1）, the first power cabinet（3）And first switch board（5）, second high voltage variable
Frequency device (BP2) includes the second transformer case (2), the second power cabinet（4）And second switch board（6）；The dual power supply high pressure is true
Empty switch cubicle（GA）Jing high-voltage variable frequency power sources switch cabinet（GH）, first, second transformer case（1、2）Transformer secondary coil Jing
Phase shift be crossed respectively to first, second power cabinet（3、4）Power cell and first, second switch board（5、6）Power supply is provided；It is described
First, second switch board（5、6）Control respectively connects first, second power cabinet（3、4）, the frequency-converter power switching cabinet（BH）
Control first, second power cabinet of connection（3、4）；The operating console（PA）Switch cabinet with high-voltage variable frequency power source（GH）, frequency conversion
Power switches cabinet（BH）And first, second switch board（5、6）Control connection, the dual power supply high voltage vacuum switchgear cabinet（GA）Will
Voltage, current signal send operating console to（PA）, first, second power cabinet（3、4）Power take-off by become
Frequency power switches cabinet（BH）Connection elevator main motor.
2. elevator according to claim 1 exchanges compound high-pressure frequency-conversion control panel, it is characterised in that：Double electricity
First high pressure vacuum of leading-out terminal A, B, C connection high-voltage variable frequency power source switching cabinet (GH) inside of source high voltage vacuum switchgear cabinet (GA)
Catalyst（ZJ1）, the first high-pressure vacuum contactor（ZJ1）Leading-out terminal a, b, c connect the second high-pressure vacuum contactor respectively
（ZJ2）And the 3rd high-pressure vacuum contactor（ZJ3）End of incoming cables, second and the 3rd high-pressure vacuum contactor（ZJ2、ZJ3）'s
On P2, P3 end of control loop connection permutator (HK1), second and the 3rd high-pressure vacuum contactor（ZJ2、ZJ3）Outlet
End a11, b11, c11, a22, b22, c22 correspondence access first, second transformer case（1、2）, first, second transformer case
（1、2）Inside it is provided with n two secondary windings and exports three-phase phase shifting voltage x current respectively and connects first, second power cabinet respectively（3、4）
Interior power cell AFR, leading-out terminal U1, V1, the W1 after two groups of the folded ripple of n power cell AFR series connection, U2, V2, W2 connection become
Frequency power switches cabinet（BH）The the 4th and the 5th internal high-pressure vacuum contactor（ZJ4、ZJ5）, the 4th and the 5th high pressure vacuum connects
Tentaculum（ZJ4、ZJ5）Control loop connection permutator（HK1）P4, P5 end on, the 4th and the 5th high-pressure vacuum contactor
（ZJ4、ZJ5）Leading-out terminal be all connected to the 6th high-pressure vacuum contactor（ZJ6）On, the 6th high-pressure vacuum contactor（ZJ6）'s
End of incoming cables U, V, W of the main motor of leading-out terminal connection mine hoist, the high-voltage variable frequency power source switch cabinet（GH）Interior
One high-pressure vacuum contactor（ZJ1）Switch cabinet with frequency-converter power（BH）The 6th interior high-pressure vacuum contactor（ZJ6）Control return
Road is connected respectively to controlling switch（BK）P1, P6 end on, the n be natural number.
3. elevator according to claim 1 exchanges compound high-pressure frequency-conversion control panel, it is characterised in that：The high pressure
Variable-frequency power sources switches cabinet（GH）It is internally provided with the first high voltage isolator（GK1）, the first high voltage isolator（GK1）Middle-end
Connection dual power supply high voltage vacuum switchgear cabinet（GA）Leading-out terminal A, B, C, the first high voltage isolator（GK1）Leading-out terminal a11,
B11, c11 connect the first high voltage converter（BP1）, the first high voltage isolator（GK1）Another leading-out terminal a22, b22, c22
Connect the second high voltage converter（BP2）；The frequency-converter power switches cabinet（BH）It is internally provided with the second high voltage isolator
（GK2）, the second high voltage isolator（GK2）Middle-end connection mine hoist mair motor end of incoming cables U, V, W, the second high pressure
Disconnecting switch（GK2）Leading-out terminal U1, V1, W1 connect the first high voltage converter（BP1）, the second high voltage isolator（GK2）'s
Another leading-out terminal U2, V2, W2 connect the second high voltage converter（BP2）.
4. elevator according to claim 1 exchanges compound high-pressure frequency-conversion control panel, it is characterised in that：Described first
Switch board（5）With the second switch board（6）Inside is respectively installed by a set of PWM control systems；The operating console（PA）Two sets control
By relaying conversion when signal processed is shared；Elevator system (TC) work when produce hydraulic pressure, lubrication, oil pressure, speed, position
Put, mechanical brake shoe, slack rope direction and the signal of conversion need to be shared, repeated ZJ respectively enters high-pressure frequency-conversion electric-control system I and height
Pressure frequency conversion electrical control system II.
5. elevator according to claim 1 exchanges compound high-pressure frequency-conversion control panel, it is characterised in that：Double electricity
Source high voltage vacuum switchgear cabinet（GA）Using TGZG-400 type high voltage vacuum switchgear cabinets, first, second high voltage converter（BP1、BP2）
Using the folded ripple boost feedback high voltage converter of AC-DC-AC power unit series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621117457.1U CN206077239U (en) | 2016-10-13 | 2016-10-13 | Elevator exchanges compound high-pressure frequency-conversion control panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621117457.1U CN206077239U (en) | 2016-10-13 | 2016-10-13 | Elevator exchanges compound high-pressure frequency-conversion control panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206077239U true CN206077239U (en) | 2017-04-05 |
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ID=58440800
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621117457.1U Active CN206077239U (en) | 2016-10-13 | 2016-10-13 | Elevator exchanges compound high-pressure frequency-conversion control panel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374756A (en) * | 2016-10-13 | 2017-02-01 | 开封市中南电器技术有限公司 | AC composite type high-voltage variable-frequency electric control equipment of lifting machine |
-
2016
- 2016-10-13 CN CN201621117457.1U patent/CN206077239U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374756A (en) * | 2016-10-13 | 2017-02-01 | 开封市中南电器技术有限公司 | AC composite type high-voltage variable-frequency electric control equipment of lifting machine |
| CN106374756B (en) * | 2016-10-13 | 2019-03-19 | 开封市中南电器技术有限公司 | Elevator exchanges compound high-pressure frequency-conversion control panel |
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