CN109841434A - Electric appliance cabinet door operation interlocking device - Google Patents
Electric appliance cabinet door operation interlocking device Download PDFInfo
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- CN109841434A CN109841434A CN201711228694.4A CN201711228694A CN109841434A CN 109841434 A CN109841434 A CN 109841434A CN 201711228694 A CN201711228694 A CN 201711228694A CN 109841434 A CN109841434 A CN 109841434A
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- cabinet door
- hole
- locating part
- electric appliance
- shaft
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Abstract
The present invention relates to electric appliance cabinet door operation interlocking devices, electric appliance cabinet door operation interlocking device includes circuit breaker frame, circuit breaker frame is equipped with the shaft that vertically extends and the locating part that can be moved left and right, and has on the active strokes of locating part for shaking shaking the locking position moved up and down into hole baffle and shake the solution lock-bit moved up and down into hole baffle for releasing to be shaken in circuit breaker frame into hole into hole on limiting circuit breaker frame；Also rotation stop is combined with locking part in shaft, and locking part, which has, to be rotated with shaft so that locating part is additionally provided in circuit breaker frame from locking position to displacement dynamic part in compression is unlocked and provides the dynamic clamping head and quiet clamping head of active force for locating part when cabinet door is closed by pressure.The breaker chamber electrification of the switchgear in cabinet door opening state is avoided, main bus-bar connects to form high tension loop, mistakenly entering charged chamber；Perfect five anti-interlocks, improve Medium Voltage Switchgear properties of product, ensure that the reliability and safety that Medium Voltage Switchgear operates with.
Description
Technical field
The present invention relates to electric appliance cabinet door operation interlocking devices.
Background technique
Mistakenly entering charged chamber requirement is prevented according in the anti-requirement of medium voltage switchgear equipment five, 35kV medium voltage switchgear equipment is being run
In the process, need to control the removable interlocked control opened component and charge compartment of cabinet body.It operates below and there is mistakenly entering charged chamber
Danger: shaken in the case where door of switch cabinet is not turned off into breaker, when the breaker of switchgear is in operating position
Open circuit breaker chamber door.In current middle-high voltage switch, interlock is usually set and is grounded between switch and breaker
Interlocking, for the five anti-requirements for meeting switchgear, it is still necessary to provide and be interlocked between a kind of achievable cabinet door and breaker
Interlock to guarantee the safety of staff.It is existing to realize the interlock interlocked between cabinet door and breaker
All it is to be arranged to shake into hole in circuit breaker frame, shakes to be equipped with into hole and shake into hole baffle, shake into hole baffle and be equipped with reset spring,
It shakes into hole baffle to shaking the safety blocked into hole to guarantee staff, when needing to shake breaker into working position from testing position
It sets；But in the case where cabinet door is not closed, shaking still can be pulled open into hole baffle to shake into breaker, still can be to staff
It causes damages.
Summary of the invention
The purpose of the present invention is to provide a kind of electric appliance cabinet door operation interlocking devices, to solve existing realization cabinet door and break
The interlock interlocked between the device of road still results in the problem of staff's danger.
To achieve the above object, the first technical solution of electric appliance cabinet door operation interlocking device of the present invention is: electric appliance cabinet door
Operation interlocking device includes circuit breaker frame and is arranged in shaking into hole in circuit breaker frame, it is described shake to be equipped with into hole shake into hole
Baffle, the locating part that is additionally provided with the shaft vertically extended in the circuit breaker frame and can move left and right, the shaft
Upper rotation stop is combined with the retainer that locating part can be made to move left and right, and has on the active strokes of the locating part for limiting open circuit
Shaking the locking position moved up and down into hole baffle and limit for releasing locating part to shaking into hole baffle into hole is shaken on device frame
The solution lock-bit of position；Also rotation stop is combined with the locking part for cooperating with cabinet door in the shaft, and the locking part has in cabinet door
It is rotated with shaft so that the part in compression that locating part is moved from locking position to unlock displacement, the breaker frame when closing by pressure
The dynamic clamping head and quiet clamping head for providing for locating part and moving to the active force of locking position by solution lock-bit is provided on frame.
Second of technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of the first technical solution of device, the locating part is equipped with jack, and the retainer includes matching with the jack
The plug portion of conjunction.Retainer drives locating part to move left and right by plug and jack cooperation, and structure is simple, convenient for operation.
The third technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of second of technical solution of device, the part of the retainer and the cooperation of shaft rotation stop is rotation stop square hole.Four directions
Pore structure is simple, easy to process.
4th kind of technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of the first of device to the third any one technical solution, the dynamic clamping head and quiet clamping head is the torsion being set in shaft
Spring.Dynamic clamping head and quiet clamping head is set up directly in shaft, is easy to control.
5th kind of technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of the first of device to the third any one technical solution, the locking part includes lance and matches with lance rotation
The outer peripheral surface of the idler wheel of conjunction, the idler wheel constitutes part in compression.The outer peripheral surface of idler wheel is the part in compression contacted with cabinet door, is subtracted
Lack friction when cabinet door is closed to cabinet door, and is convenient for the closing of cabinet door.
6th kind of technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of 5th kind of technical solution of device, the lance is equipped with lance square hole far from one end of idler wheel, and the lance is logical
It crosses lance square hole and shaft rotation stop cooperates.
7th kind of technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of the first of device to the third any one technical solution, on the locating part for shake into hole baffle limit
Part be equipped with towards circuit breaker frame flange.Flange increases locating part and shakes the contact area into hole baffle, improves
Locating part is to the stability shaken into the limit of hole baffle.
8th kind of technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of the first of device to the third any one technical solution, the shaft is equipped with limiting groove, the limit
It is equipped in groove and the spacing collar limited up and down is carried out to retainer.Sliding of the retainer in shaft is prevented, stop is unfavorable for
Part is mobile to the left and right displacement of locating part.
9th kind of technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of the first of device to the third any one technical solution, the circuit breaker frame is equipped with interlocking pedestal, institute
Shaft setting is stated on interlocking pedestal, the locating part guiding is slidedly assemblied on interlocking pedestal, and the interlocking pedestal is equipped with
Locating part is limited to the limiting slot moved to left.Limiting slot avoids locating part transition from being moved to the left.
Tenth kind of technical solution of electric appliance cabinet door operation interlocking device of the present invention is: in electric appliance cabinet door operation interlocking of the present invention
On the basis of 9th kind of technical solution of device, the locating part is equipped with jack, and the retainer includes matching with the jack
The plug portion of conjunction, the limiting slot limit plug portion to limit locating part to moving to left.
The beneficial effects of the present invention are: being arranged in circuit breaker frame to the locating part limited into hole baffle is shaken, pass through torsion
The reset itself of spring, only in the cabinet door for turning off the switch cabinet, cabinet door squeezes locking part, and locking part overcomes torsional spring by shaft
Effect makes locating part release limitation to shaking into hole baffle, enables to shake into hole baffle and is opened, and crank insertion is shaken will into hole
Breaker shakes the breaker chamber electrification that the switchgear in cabinet door opening state is avoided into operating position, main mother from testing position
Line connects to form high tension loop, mistakenly entering charged chamber；Perfect five anti-interlocks, improve Medium Voltage Switchgear properties of product,
It ensure that the reliability and safety that Medium Voltage Switchgear operates with.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the breaker of electric appliance cabinet door operation interlocking device of the invention in testing position；
Fig. 2 is structural schematic diagram of the breaker of electric appliance cabinet door operation interlocking device of the invention at operating position；
Fig. 3 is that electric appliance cabinet door operation interlocking device of the invention removes the structural schematic diagram after breaker chamber cabinet door；
Fig. 4 is the cabinet door structural representation that locating part stretches out in the open state of electric appliance cabinet door operation interlocking device of the invention
Figure；
Fig. 5 is that cabinet door shakes schematic diagram when being in locking state into hole baffle in the open state in Fig. 4；
Fig. 6 is that the structure that locating part is pulled when the cabinet door of electric appliance cabinet door operation interlocking device of the invention is in close state is shown
It is intended to；
Fig. 7 is the schematic diagram shaken when cabinet door is in close state in Fig. 6 into hole baffle when in the unlocked state；
Fig. 8 is the structural schematic diagram into hole baffle and interlock cooperation that shakes of electric appliance cabinet door operation interlocking device of the invention；
Fig. 9 is the rearview of interlock in Fig. 8；
Figure 10 is the axonometric drawing of interlock in Fig. 8；
Figure 11 is the structural schematic diagram of the locating part of interlock in Fig. 8；
Figure 12 is the structural schematic diagram of the retainer of interlock in Fig. 8；
Figure 13 is the structural schematic diagram of the shaft of interlock in Fig. 8；
Figure 14 is the structural schematic diagram of the lance of interlock in Fig. 8.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
The specific embodiment of electric appliance cabinet door operation interlocking device of the invention, as depicted in figs. 1 and 2, electric appliance cabinet door operation
Interlock include cabinet body 1, cabinet door 2 and be located at the indoor breaker 3 of breaker of switch cabinet.It is not specified in the present embodiment
When, cabinet door 2 refers to the door of breaker chamber, and cabinet door 2 is in the front side of breaker chamber.As shown in figure 3, breaker 3 includes breaker
Frame 5, circuit breaker frame 5 are equipped with interlock 4, and breaker 3 is in testing position, as shown in Figure 1, breaker 3 does not have shape
At conducting circuit, breaker chamber is not charged；Breaker 3 is at operating position, as shown in Fig. 2, breaker 3 forms conducting circuit,
Breaker chamber is in electrification in high voltage state, and there are the danger of mistakenly entering charged chamber.
In the present embodiment, as shown in Fig. 3 to Fig. 7, the front side that breaker 3 is located at breaker chamber is equipped with circuit breaker frame 5, breaks
Road device frame 5 is equipped with and is shaken with convert breaker 3 from testing position to operating position into hole 8 for protruding into for crank, is shaken
Be equipped with into hole 8 and shake shaking into hole baffle 6 into hole 8 for blocking, shake into hole baffle 6 and shake between hole equipped with returning spring,
When need for be inserted into crank shake into hole 8 when, shake make to shake into the drop-down of hole baffle 6 opened into hole 8 and by crank insertion it is disconnected to realize
Road device 3 is converted from testing position to operating position；After breaker 3 is shaken from testing position into operating position, extraction is shaken
Shaking into hole baffle 6 to block again under the action of returning spring and shake into hole 8, crank cannot be inserted into, and cannot be carried out to breaker
Shake into operation, shake into hole baffle 6 can blocks dust enter in breaker chamber and play the role of preventing maloperation.
In the present embodiment, interlock 7 is equipped with locating part 14, has on the active strokes of locating part 14 disconnected for limiting
Shaking the locking position moved up and down into hole baffle 6 and shaken in circuit breaker frame 3 for releasing into hole 6 into hole 8 is shaken on road device frame 5
Shake the solution lock-bit moved up and down into hole baffle 8；As shown in Figure 4 and Figure 5, cabinet door 2 in the open state, interlock 7
Locating part 14 is set to be moved to the left to locking position under the action of torsional spring, which, which is located at, shakes into the lower end of hole baffle 6, locating part
14 are limited into hole baffle 6 will shake to be locked at into hole baffle 6 and shake on hole 8 in locking position to shaking, and make to shake into hole baffle 6
Cannot pull down, shake into hole 8 and remain off, crank cannot be inserted into shake into hole 8 to prevent breaker 3 from from testing position to
Operating position conversion, ensure that the safety of staff.
In the present embodiment, as shown in Figure 6 and Figure 7, when cabinet door 2 is in close state, cabinet door 2 squeezes lance 12, makes to hit
Bar 12 drives to be rotated with the shaft 10 of 12 rotation stop of lance cooperation, and shaft 10 drives locating part 14 to move right to solution lock-bit again, limits
The position releasing of part 14 is in unlocked state so as to shake into hole baffle 6 to the limit shaken into hole baffle 6, and shaking at this time can be with into hole baffle 6
Drop-down, which makes to shake into hole, opens, and crank can be inserted to shake into hole 8 and shake breaker 3 into operating position from testing position.Only in cabinet
Door 2 can just shake in the case where closing into breaker, prevent mistakenly entering charged chamber function in perfect five anti-interlockings, prevent from being in
When breaker of switch cabinet room door is in door opening state, breaker shakes into operating position and forms high tension loop, and staff is strayed into band
Electrical circuit breakers room.
In the present embodiment, as shown in Fig. 8 to Figure 14, interlock 7 includes interlocking pedestal 9, and interlocking pedestal 9 is equipped with it
The mounting hole 91 that is fixed in circuit breaker frame 5 and for limiting locating part 14 excessively to the limiting slot 92 moved to left, in other realities
It applies in example, limiting slot 92 can also be not provided on pedestal 9 by interlocking, and in interlock and be shaken into setting between the baffle of hole for limit
Lever of the position part to left limit；Interlocking pedestal 9 is provided through shaft 10 in above-below direction, and shaft 10 is equipped with the first Sifangtai
101 and second Sifangtai 103, the lower section of the first Sifangtai be equipped with annular spacing groove 102；Retainer 13 is equipped with the first square hole
131, the first square hole 131 cooperates with 101 rotation stop of the first Sifangtai in shaft 10, and retainer 13 is far from the first square hole 131
One end insertion locating part 14 jack 141 so that locating part 14 can be moved left and right with the swing of retainer 13, limit
Be additionally provided with flange 142 on part 14, flange 142 is limited to shaking into hole baffle 6, make flange 142 with shake the contact into hole baffle 6
Face increases, and improves to the stability shaken into the limit of hole baffle 6；Spacing collar 16, limit are equipped in the annular spacing groove 102 of shaft 10
Position circle 16 guarantees the stability that retainer 13 is swung for preventing retainer 13 from sliding in shaft 10；In the present embodiment, shaft
Torsional spring 15 is additionally provided on 10, torsional spring 15 is used to that shaft 10 to be made to reset when cabinet door 2 is opened to move left to shake locating part into hole and keep off
The lower section of piece 6 is limited to shaking into hole baffle 6.
In the present embodiment, lance 12 is equipped with the second square hole 121, the second four directions of the second square hole 121 and shaft 10
The cooperation of 103 rotation stop of platform, one end on lance far from the second square hole 121 are equipped with idler wheel mounting hole 122, on idler wheel mounting hole 122
Idler wheel 11 is installed, idler wheel 11 by 122 rolling assembling of idler wheel mounting hole on lance 12, the outer peripheral surface of idler wheel 11 constitute by
Laminate section, idler wheel 11 can reduce the friction damage of cabinet door 2 when cabinet door 2 squeezes lance 12, while also can more close labour-saving
Cabinet door 2 is closed, idler wheel 11 and lance 12 constitute locking part.
When work, when cabinet door 2 in the open mode, torsional spring 15 is in free state, and retainer 13 passes through the first square hole
131 cooperate with 101 rotation stop of the first Sifangtai of shaft 10, and enterprising in the axial direction of shaft 10 to retainer 13 by spacing collar 16
Row positioning, at this point, not overcoming the applied force of the active force of torsional spring 15 on retainer 13, therefore retainer 13 cannot drive limit
Part 14 moves right, and locating part 14 cannot release the limit shaken into hole baffle 6, and shaking into hole baffle 6 cannot pull down, breaker 3
Crank cannot be inserted into the transition shift for shaking and can not achieve breaker into hole 8 from testing position to operating position so that breaker
It can not charge；When cabinet door 2 in off position when, cabinet door 2 hit during the shutdown process idler wheel 11 and squeezing roller 11 drive hit
Bar 12 rotates counterclockwise, and lance 12 is cooperated by 103 rotation stop of the second Sifangtai of the second square hole 121 and shaft 10, and the two or four
The mountable nut in the top of fang platform 103 in the axial direction of shaft 10 to limit lance 12, so that shaft 10 turns counterclockwise
Dynamic, retainer 13 also rotates therewith, and retainer 13 pushes locating part 14 to move right again, realizes locating part 14 to shaking into hole
The limit of baffle 6 releases, and shaking into hole baffle 6 on breaker can smoothly push openings, realization breaker from testing position to
Operating position shake into.
In the present embodiment, then shaft is inserted into locating part by retainer again before this by cooperating with retainer rotation stop
Jack in driving locating part moved left and right, in other embodiments, retainer can be gear, locating part is rack gear,
Retainer and locating part are engaged by gear realizes moving left and right for locating part, and rack gear is equipped with and limit far from the side of retainer
Slot cooperates to limit the protrusion that rack gear is excessively moved to the left；In the present embodiment, retainer and shaft pass through square hole and four directions
The cooperation of platform rotation stop, in other embodiments, is equipped with keyway, retainer and shaft and is matched by key rotation stop on retainer and shaft
It closes；In other embodiments, idler wheel can be not provided on lance, end of the lance far from shaft is part in compression；In other realities
It applies in example, flange can be not provided on locating part；In other embodiments, it can also be not provided with limiting slot, by torsional spring to only
The limit of moving part progress up and down direction.
Claims (10)
1. including circuit breaker frame and shaking into hole in circuit breaker frame is arranged in electric appliance cabinet door operation interlocking device, described to shake
Be equipped with and shaken into hole baffle into hole, it is characterised in that: be additionally provided in the circuit breaker frame shaft that vertically extends and
The locating part that can be moved left and right, rotation stop is combined with the retainer that locating part can be made to move left and right, the locating part in the shaft
Active strokes on have for shaking shaking the locking position moved up and down into hole baffle and be used for into hole on limiting circuit breaker frame
Locating part is released to shaking the solution lock-bit limited into hole baffle；Also rotation stop is combined with for cooperating with cabinet door in the shaft
Locking part, the locking part, which has, to be rotated with shaft so that locating part is from locking position to Xie Suowei when cabinet door is closed by pressure
Mobile part in compression is additionally provided with the active force for providing for locating part and moving to locking position by solution lock-bit in the circuit breaker frame
Dynamic clamping head and quiet clamping head.
2. electric appliance cabinet door operation interlocking device according to claim 1, it is characterised in that: the locating part, which is equipped with, to be inserted
Hole, the retainer include the plug portion with jack cooperation.
3. electric appliance cabinet door operation interlocking device according to claim 2, it is characterised in that: the retainer and shaft rotation stop
The part of cooperation is rotation stop square hole.
4. electric appliance cabinet door operation interlocking device according to claim 1 to 3, it is characterised in that: the elasticity is multiple
Position part is the torsional spring being set in shaft.
5. electric appliance cabinet door operation interlocking device according to claim 1 to 3, it is characterised in that: the locking part
Including lance and the idler wheel being rotatably assorted with lance, the outer peripheral surface of the idler wheel constitutes part in compression.
6. electric appliance cabinet door operation interlocking device according to claim 5, it is characterised in that: the lance far from idler wheel one
End is equipped with lance square hole, and the lance is cooperated by lance square hole and shaft rotation stop.
7. electric appliance cabinet door operation interlocking device according to claim 1 to 3, it is characterised in that: the locating part
On for shake into hole baffle limit part be equipped with towards circuit breaker frame flange.
8. electric appliance cabinet door operation interlocking device according to claim 1 to 3, it is characterised in that: in the shaft
Equipped with limiting groove, it is equipped in the limiting groove and the spacing collar limited up and down is carried out to retainer.
9. electric appliance cabinet door operation interlocking device according to claim 1 to 3, it is characterised in that: the breaker
Frame is equipped with interlocking pedestal, and on interlocking pedestal, the locating part guiding is slidedly assemblied in interlocking pedestal for the shaft setting
On, the interlocking pedestal is equipped with limitation locating part to the limiting slot moved to left.
10. electric appliance cabinet door operation interlocking device according to claim 9, it is characterised in that: the locating part, which is equipped with, to be inserted
Hole, the retainer include the plug portion with jack cooperation, and the limiting slot limits plug portion to limit limit
Part is to moving to left.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711228694.4A CN109841434B (en) | 2017-11-29 | 2017-11-29 | Operation interlocking device for electric appliance cabinet door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711228694.4A CN109841434B (en) | 2017-11-29 | 2017-11-29 | Operation interlocking device for electric appliance cabinet door |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109841434A true CN109841434A (en) | 2019-06-04 |
| CN109841434B CN109841434B (en) | 2020-10-20 |
Family
ID=66882307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711228694.4A Active CN109841434B (en) | 2017-11-29 | 2017-11-29 | Operation interlocking device for electric appliance cabinet door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109841434B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110752567A (en) * | 2019-10-29 | 2020-02-04 | 威腾电气集团股份有限公司 | Jack box with triple interlocking function |
| CN112696098A (en) * | 2020-12-15 | 2021-04-23 | 宁波生久柜锁有限公司 | Telescopic rotary unlocking device for power distribution cabinet |
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| US6545859B2 (en) * | 2001-01-30 | 2003-04-08 | Eaton Corporation | Automatically operating interlock assembly for electrical cabinets |
| CN101692522A (en) * | 2009-08-25 | 2010-04-07 | 温州新机电器有限公司 | Interlocking device for earthing switch operation of switch cabinet |
| CN102543516A (en) * | 2012-01-10 | 2012-07-04 | 昆明东控电器成套设备有限公司 | Five-prevention system of high-voltage switch cabinet |
| CN106373805A (en) * | 2016-11-09 | 2017-02-01 | 南方电网科学研究院有限责任公司 | Door interlocking device for nitrogen switch cabinet |
| CN107069464A (en) * | 2017-06-06 | 2017-08-18 | 信阳师范学院 | Switch cubicle and its cabinet door interlock |
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2017
- 2017-11-29 CN CN201711228694.4A patent/CN109841434B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6545859B2 (en) * | 2001-01-30 | 2003-04-08 | Eaton Corporation | Automatically operating interlock assembly for electrical cabinets |
| CN101692522A (en) * | 2009-08-25 | 2010-04-07 | 温州新机电器有限公司 | Interlocking device for earthing switch operation of switch cabinet |
| CN102543516A (en) * | 2012-01-10 | 2012-07-04 | 昆明东控电器成套设备有限公司 | Five-prevention system of high-voltage switch cabinet |
| CN106373805A (en) * | 2016-11-09 | 2017-02-01 | 南方电网科学研究院有限责任公司 | Door interlocking device for nitrogen switch cabinet |
| CN107069464A (en) * | 2017-06-06 | 2017-08-18 | 信阳师范学院 | Switch cubicle and its cabinet door interlock |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110752567A (en) * | 2019-10-29 | 2020-02-04 | 威腾电气集团股份有限公司 | Jack box with triple interlocking function |
| CN110752567B (en) * | 2019-10-29 | 2021-09-21 | 威腾电气集团股份有限公司 | Jack box with triple interlocking function |
| CN112696098A (en) * | 2020-12-15 | 2021-04-23 | 宁波生久柜锁有限公司 | Telescopic rotary unlocking device for power distribution cabinet |
| CN112696098B (en) * | 2020-12-15 | 2021-12-21 | 宁波生久科技有限公司 | Telescopic rotary unlocking device for power distribution cabinet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109841434B (en) | 2020-10-20 |
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