CN109473308A - A kind of ring network cabinet faulty action preventing blocking device - Google Patents
A kind of ring network cabinet faulty action preventing blocking device Download PDFInfo
- Publication number
- CN109473308A CN109473308A CN201810681723.0A CN201810681723A CN109473308A CN 109473308 A CN109473308 A CN 109473308A CN 201810681723 A CN201810681723 A CN 201810681723A CN 109473308 A CN109473308 A CN 109473308A
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- plate
- mounting plate
- ring network
- network cabinet
- fixed
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/46—Interlocking mechanisms
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Abstract
The invention discloses a kind of ring network cabinet faulty action preventing blocking devices, including bottom plate, controller and isolation board, the isolation board is fixed with bottom plate, the isolation board is equipped with the first mounting plate and the second mounting plate, first mounting plate is equipped with handle hole and closed plate, and the closed plate is slidably connected with the first mounting plate;Second mounting plate is equipped with electromagnetic lock component, and the electromagnetic lock component includes electromagnet, magnetism stick and lock tongue, and the lock tongue is connect with magnetism stick, and the electromagnet assembly is electrically connected with the controller.The present invention realizes that off-position could open blocking device function by setting and the associated blocking device of ring network cabinet high pressure off-position, to improve the purpose of the operational security of operator, while guaranteeing easy to operate when device uses.
Description
Technical field
The present invention relates to high voltage electric equipment manufacturing technology fields, are latched and fill more particularly, to a kind of ring network cabinet faulty action preventing
It sets.
Background technique
Ring network cabinet is one group of transmission & distribution electrical equipment (high-tension switch gear) in metal or non-metallic insulation cabinet body or does
At the electrical equipment of assembled compartment ring network power supplying units, core component is load switch and fuse, and on-load switch is used for
High tension loop is controlled, fuse is responsible for protecting high tension loop.Ring network cabinet is widely used in Urban Residential District, skyscraper and work
In the power distribution station and box-type substation of the load centers such as enterprise, factory.Ring network cabinet is internally provided with executing agency and operating mechanism,
Executing agency includes the high voltage electric equipments such as fuse, and operating mechanism includes the handle hole for controlling ring network cabinet power on/off
And it is set to the main shaft in handle hole.User can be by rotating main shaft in dedicated handle insertion operation hole, main shaft turns
Location status there are three being correspondingly arranged during dynamic includes the on-position for representing executing agency's electrification, represents executing agency
The earthing position of ground connection and in middle position between the two.When ring network cabinet is overhauled, need to power off route, but it is existing
Ring network cabinet power-off with cabinet door open when two individually movement, cabinet door can be opened when the power is not cut off, there are security risks.
China Patent Publication No. CN204289162U, publication date are on 04 22nd, 2015, entitled " ring network cabinet push-pull rod
Blocking device " discloses a kind of ring network cabinet push-pull rod blocking device, solves outdoor ring main unit push-pull rod management in distribution network systems
The problem of being easy to produce maloperation in not in place, operating process.But the device is locked by padlock, padlock swich and electricity
Lock energized state is without connection, and when not can guarantee padlock opening, electric brake is centainly in off-position.
Summary of the invention
The present invention in order to overcome the shortcomings in the prior art, provides a kind of ring network cabinet protection against electric shock blocking device, passes through setting
With the associated blocking device of ring network cabinet high pressure off-position, realize that off-position could open blocking device function, to improve behaviour
Make the purpose of the operational security of personnel, while guaranteeing easy to operate when device uses.
To achieve the goals above, the invention adopts the following technical scheme:
A kind of ring network cabinet faulty action preventing blocking device, including bottom plate, controller and isolation board, the isolation board are fixed with bottom plate, institute
Isolation board is stated equipped with the first mounting plate and the second mounting plate, first mounting plate is equipped with handle hole and closed plate, described
Closed plate is slidably connected with the first mounting plate;Second mounting plate is equipped with electromagnetic lock component, and the electromagnetic lock component includes
Electromagnet, magnetism stick and lock tongue, the lock tongue are connect with magnetism stick, and the electromagnet assembly is electrically connected with the controller.The lock
The state that tongue is stretched out or retracted is associated with the on-off electricity condition of ring network cabinet, when the high pressure of ring network cabinet is powered, the controller
The solenoid actuated lock tongue is controlled to stretch out;When the power-off of the high pressure of ring network cabinet, the solenoid actuated lock tongue is retracted.By adopting
With above-mentioned technical proposal, control piece is electrically connected with electromagnetic lock component, and when ring network cabinet power-off, controller issues signal and controls electromagnetism
Iron achievees the purpose that control electromagnetic lock component movement, and realizes the linkage of the on-off electricity condition of electromagnetic lock component and ring network cabinet.
When needing to operate handle hole, ring network cabinet needs high pressure to power off, then controller issues signal, and solenoid actuated lock tongue retracts, behaviour
Closed plate sliding motion can be pushed by making personnel, and until opening wide handle hole, operator carries out subsequent behaviour to handle hole again
Make.When ring network cabinet electrification in high voltage, solenoid actuated lock tongue stretches out, and operator cannot push closed plate, i.e. closed plate will be grasped
Make hole closing, operator cannot operate handle hole, prevent operator from grasping in the case where ring network cabinet electrification in high voltage
Hole is operated, to achieve the purpose that protect operator's operation safety.The linkage and ring network cabinet of electromagnetic lock component and closed plate
High pressure on-off electricity condition it is associated, only when ring network cabinet high pressure powers off, handle hole can just be opened wide, and have preferable operation peace
Quan Xing.The controller is Common Controller, and such as single-chip microcontroller is only used for realizing conventional control function, i.e., according to the letter of input
Number, change the current direction by electromagnet.When being changed by the current direction of electromagnet, the magnetic direction of electromagnet also changes
Become, to control the retracted position of magnetism stick, lock tongue follows magnetism stick flexible, reaches the switching of locking and unlocked state.
Preferably, the closed plate is equipped with multiple slippage slots, first mounting plate is equipped with multiple sliding screws,
The slippage slot and sliding screw correspond, in corresponding slippage slot and sliding screw, the sliding screw and slippage slot
It is slidably connected.By using above-mentioned technical proposal, closed plate passes through slippage slot and slides being slidably matched for screw, realizes closed plate
With being slidably matched for the first mounting plate, screw had both played the role of support and had guided the smooth sliding of closed plate, meanwhile, slide screw
Head play the role of that closed plate is made to fit with the first mounting plate, and structure is simple, and the personnel of being easily installed carry out installation work
Industry.
Preferably, being equipped with limit plate below the closed plate, the limit plate is fixed with the first mounting plate, the closing
Plate is slidably matched with limit plate.By using above-mentioned technical proposal, limit plate plays in closed plate sliding process and limits and draw
The effect of closed plate movement is led, and then achievees the purpose that the stability for improving closed plate sliding.
Preferably, the bottom plate is equipped with display, the display is electrically connected with the controller.By using above-mentioned skill
Art scheme, and when high pressure power-off, electrification display lamp does not work, and electromagnetic actuation, locking device unlocks, and operation is allowed to connect
Ground switch;When electrification in high voltage, when display lamp is bright, electromagnet is not attracted, and electromagnetic lock component locking does not allow operational grounding to open
It closes, then electrification display plays the role of standby signal, in order to which operator carries out observation judgement.
Preferably, second mounting plate is equipped with fixed plate, the electromagnetic lock component is fixed with fixed plate, described solid
Fixed board is fixed with the second mounting plate.
Preferably, the fixed plate includes mounting portion and placement section, the mounting portion and the second mounting plate pass through fixation
Screw is fixed, and the placement section includes horizontal curved folding part, vertical bending part and extension, and the extension and the second mounting plate are logical
It crosses fixing screws to fix, the electromagnetic lock is arranged between vertical bending part and the second mounting plate.By using above-mentioned technical side
Case, electromagnetic lock component are installed on placement section, and fixed plate is detachably connected by the side panel of mounting portion and operating mechanism,
While Motionless electromagnetic lock set, installation or removal operation is carried out convenient for operator.Electromagnetic lock component can be located in vertical curved
Between folding part and fixed plate, play the role of pre-fixing, subsequent installation is carried out to electromagnetic lock component convenient for operator and is fastened
Operation has preferable practicability and installation convenience.
Preferably, the electromagnetic lock component is fixed with vertical bending part by attachment screw, the attachment screw is passed through
Mounting portion.By using above-mentioned technical proposal, electromagnetic lock component is detachably connected by attachment screw and vertical bending part, to reach
To the purpose further fixed;And screw connects this mode being detachably connected, convenient for electromagnetic lock component carry out maintenance or
Disassembly, structure is simple, operates convenient for operator.
Preferably, further including spring, one end of the spring is connect with the first mounting plate, and the other end and closed plate connect
It connects.By using above-mentioned technical proposal, for user after completing to the operation of main shaft, elastic component can pull closed plate to move, from
And achieve the purpose that reclose handle hole.
Preferably, the closed plate is fixed with the first mounting plate by lock-screw.By using above-mentioned technical proposal,
When not needing opening enclosed plate, closed plate and mounting plate are locked by lock-screw, reach the mesh for further fixing closed plate
's;When needing opening enclosed plate, need first to dismantle lock-screw, then carry out subsequent operation.
The beneficial effects of the present invention are: (1) only when ring network cabinet powers off, could release electromagnetic lock component and closed plate it
Between locking, prevent operator from directly operating handle hole in the case where ring network cabinet electrification in high voltage, thus reach raising operation
The purpose of personnel's operational security;(2) operator can judge the high pressure of ring network cabinet by the light on and off of observation electrification display etc.
On-off electricity condition;(3) structure is relatively easy, and manufacture is easy;(4) unlock operating process is simple.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention;
Fig. 2 is partial structural diagram of the invention;
Fig. 3 is the structural schematic diagram at fixed plate of the present invention.
In figure: bottom plate 1, controller 2, isolation board 3, the first mounting plate 4, handle hole 4.1, the second mounting plate 5, closed plate
6, slippage slot 6.1, electromagnetic lock component 8, electromagnetic lock component 8.1, lock tongue 8.3, sliding screw 9, limit plate 10, display 11, solid
Fixed board 12, mounting portion 12.1, placement section 12.2, horizontal curved folding part 12.2.1, vertical bending part 12.2.2, extension 12.2.3,
Fixing screws 13, attachment screw 14, spring 15, lock-screw 16.
Specific embodiment
The present invention will be further described in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, Figure 2 and Figure 3, a kind of ring network cabinet faulty action preventing blocking device, including bottom plate 1, controller 2 and isolation board
3, the isolation board 3 and bottom plate 1 are fixed, and the isolation board 3 is equipped with the first mounting plate 4 and the second mounting plate 5, first peace
Loading board 4 is equipped with handle hole 4.1 and closed plate 6, and the closed plate 6 is slidably connected with the first mounting plate 4;Second mounting plate
5 are equipped with electromagnetic lock component 8, and electromagnetic lock component 8 includes electromagnet 8.1, magnetism stick 8.2 and lock tongue 8.3, the lock tongue 8.3 with
Magnetism stick 8.2 connects, and the electromagnetic lock component 8 is electrically connected with controller 2.The state and ring that the lock tongue 8.3 is stretched out or retracted
The on-off electricity condition of net cabinet is associated, and when the high pressure of ring network cabinet is powered, the controller 2 controls the electromagnetic lock component 8.1
Driving lock tongue 8.3 stretch out;When the power-off of the high pressure of ring network cabinet, the electromagnetic lock component 8.1 drives lock tongue 8.3 to retract.Pass through
By adopting the above technical scheme, controller 2 is electrically connected with electromagnetic lock component 8, and when ring network cabinet power-off, controller 2 issues signal control
Electromagnet 8.1 processed achievees the purpose that controlling electromagnetic lock component 8 moves, and realizes the power on/off of electromagnetic lock component 8 Yu ring network cabinet
The linkage of state.When needing to operate handle hole 4.1, ring network cabinet needs high pressure to power off, then controller 2 issues signal, electromagnet
8.1 driving lock tongues 8.3 retract, and operator can push 6 sliding motion of closed plate, until unlimited handle hole 4.1, operation
Personnel carry out subsequent operation to handle hole 4.1 again.When ring network cabinet electrification in high voltage, electromagnet 8.1 drives lock tongue 8.3 to stretch out, behaviour
Closed plate 6 cannot be pushed by making personnel, i.e. closed plate 6 closes handle hole 4.1, and operator cannot grasp handle hole 4.1
Make, prevent operator from operating handle hole 4.1 in the case where ring network cabinet electrification in high voltage, to reach protection operator's operation
The purpose of safety.The linkage of electromagnetic lock component 8 and closed plate 6 is associated with the high pressure on-off electricity condition of ring network cabinet, only works as ring
When net cabinet high pressure powers off, handle hole 4.1 can just be opened wide, and have preferable operational security.The controller 2 is general control
Device, such as single-chip microcontroller are only used for realizing that conventional control function changes that is, according to the signal of input through electromagnetic lock component 8.1
Current direction.When being changed by the current direction of electromagnetic lock component 8.1, the magnetic direction of electromagnetic lock component 8.1 also changes, from
And the retracted position of magnetism stick 8.2 is controlled, lock tongue 8.3 follows magnetism stick 8.2 flexible, reaches the switching of locking and unlocked state.
The closed plate 6 is equipped with multiple slippage slots 6.1, and first mounting plate 4 is equipped with multiple sliding screws 9, institute
State slippage slot 6.1 and sliding screw 9 correspond, corresponding slippage slot 6.1 in sliding screw 9, the sliding screw 9 and
Slippage slot 6.1 is slidably connected.The sliding for passing through slippage slot 6.1 and sliding screw 9 by using above-mentioned technical proposal, closed plate 6
Cooperation, realization closed plate 6 are slidably matched with the first mounting plate 4, and screw had both played support and guided the smooth sliding of closed plate 6
Effect, meanwhile, the head of sliding screw 9 plays the role of that closed plate 6 is made to fit with the first mounting plate 4, and structure is simple, just
Installation exercise is carried out in installation personnel.
Limit plate 10 is equipped with below the closed plate 6, the limit plate 10 and the first mounting plate 4 are fixed, the closed plate 6
It is slidably matched with limit plate 10.By using above-mentioned technical proposal, limit plate 10 plays limit in 6 sliding process of closed plate
And the effect for guiding closed plate 6 to move, and then achieve the purpose that improve the stability that closed plate 6 is slided.
The bottom plate 1 is equipped with display 11, and the display 11 is electrically connected with controller 2.By using above-mentioned technology
Scheme, and when high pressure power-off, 11 lamp of electrification display does not work, and electromagnetic lock component is attracted, and locking device unlocks, allows to grasp
Make earthing switch;When electrification in high voltage, when 11 lamp of electrification display is bright, electromagnetic lock component is not attracted, and electromagnetic lock component 8 is latched,
Operational grounding is not allowed to switch, display 11 plays the role of standby signal, in order to which operator carries out observation judgement.
Second mounting plate 5 is equipped with fixed plate 12, and the electromagnetic lock component 8 and fixed plate 12 are fixed, the fixation
Plate 12 and the second mounting plate 5 are fixed.
The fixed plate 12 includes mounting portion 12.1 and placement section 12.2, and the mounting portion 12.1 and the second mounting plate 5 are logical
It is fixed to cross fixing screws 13, the placement section 12.2 includes horizontal curved folding part 12.2.1, vertical bending part 12.2.2 and extension
12.2.3, the extension 12.2.3 and the second mounting plate 5 are fixed by fixing screws 13, and the electromagnetic lock component 8.1 is arranged
Between vertical bending part 12.2.2 and the second mounting plate 5.By using above-mentioned technical proposal, electromagnetic lock component 8.1 is installed on
On placement section 12.2, and fixed plate 12 is detachably connected by mounting portion 12.1 and the side panel of operating mechanism, in Motionless electromagnetic
While lock set 8, installation or removal operation is carried out convenient for operator.Electromagnetic lock component 8.1 can be located in vertical bending part
12.2.2 between fixed plate 12, play the role of pre-fixing, subsequent peace is carried out to electromagnetic lock component 8.1 convenient for operator
Terminal operation is filled, there is preferable practicability and installation convenience.
The electromagnetic lock component 8.1 and vertical bending part 12.2.2 is fixed by attachment screw 14, the attachment screw 14
Across mounting portion 12.1.By using above-mentioned technical proposal, electromagnetic lock component 8 passes through attachment screw 14 and vertical bending part
12.2.2 it is detachably connected, to achieve the purpose that further fix;And screw connects this mode being detachably connected, convenient for pair
Electromagnetic lock component 8 is safeguarded or is dismantled, and structure is simple, is operated convenient for operator.
It further include spring 15, one end of the spring 15 is connect with the first mounting plate 4, and the other end is connect with closed plate 6.It is logical
It crosses by adopting the above technical scheme, user is after completing to the operation of main shaft 7, and elastic component can pull closed plate 6 to move, to reach
To the purpose for reclosing handle hole 4.1.
The closed plate 6 and the first mounting plate 4 are fixed by solid lock-screw 16.By using above-mentioned technical proposal, when
When not needing opening enclosed plate 6, closed plate 6 is locked with the first mounting plate 4 by lock-screw 16, is reached and is further fixed closing
The purpose of plate 6;When needing opening enclosed plate 6, need first to dismantle lock-screw 16, then carry out subsequent operation.
By using above-mentioned technical proposal, when needing to operate handle hole 4.1, ring network cabinet needs high pressure to power off, then electromagnetism
Lock set 8.1 drives lock tongue 8.3 to retract, and operator dismantles lock-screw 16, then pushes 6 sliding motion of closed plate, until
Until opening wide handle hole 4.1, operator carries out subsequent operation to handle hole 4.1 again.After the completion of operation, elastic component can pull envelope
Closing plate 6 moves, to achieve the purpose that reclose handle hole 4.1.When ring network cabinet electrification in high voltage, electromagnetic lock component 8.1 is driven
Dynamic lock tongue 8.3 stretches out, and operator cannot push closed plate 6, i.e. closed plate 6 closes handle hole 4.1, and operator cannot be right
Handle hole 4.1 is operated, and prevents operator from operating handle hole 4.1 in the case where ring network cabinet electrification in high voltage, to reach
Protect the purpose of operator's operation safety.The linkage of electromagnetic lock component 8 and closed plate 6 and the high pressure on-off electricity condition of ring network cabinet
Associated, only when ring network cabinet high pressure powers off, handle hole 4.1 can just be opened wide, and have preferable operational security.
The beneficial effects of the present invention are: only when ring network cabinet powers off, could release electromagnetic lock component 8 and closed plate 6 it
Between locking, prevent operator from directly operating handle hole 4.1 in the case where ring network cabinet electrification in high voltage, thus reach raising behaviour
Make the purpose of personnel's operational security;Operator can judge the height of ring network cabinet by the light on and off of observation electrification display 11 etc.
Press on-off electricity condition;Structure is relatively easy, and manufacture is easy;It is simple to unlock operating process.
Claims (9)
1. a kind of ring network cabinet faulty action preventing blocking device, characterized in that including bottom plate, controller and isolation board, the isolation board with
Bottom plate is fixed, the isolation board be equipped with the first mounting plate and the second mounting plate, first mounting plate be equipped with handle hole and
Closed plate, the closed plate are slidably connected with the first mounting plate;Second mounting plate is equipped with electromagnetic lock component, the electromagnetism
Lock set includes electromagnet, magnetism stick and lock tongue, and the lock tongue is connect with magnetism stick, and the electromagnet assembly is electrically connected with controller
It connects.
2. a kind of ring network cabinet faulty action preventing blocking device according to claim 1, characterized in that the closed plate is equipped with more
A slippage slot, first mounting plate are equipped with multiple sliding screws, and the slippage slot and sliding screw correspond, in correspondence
Slippage slot and sliding screw in, the sliding screw is slidably connected with slippage slot.
3. a kind of ring network cabinet faulty action preventing blocking device according to claim 1, characterized in that be equipped with below the closed plate
Limit plate, the limit plate are fixed with the first mounting plate, and the closed plate is slidably matched with limit plate.
4. a kind of ring network cabinet faulty action preventing blocking device according to claim 1, characterized in that the bottom plate is equipped with display
Device, the display are electrically connected with the controller.
5. a kind of ring network cabinet faulty action preventing blocking device according to claim 1 or 2 or 3 or 4, characterized in that described second
Mounting plate is equipped with fixed plate, and the locked component is fixed with fixed plate, and the fixed plate is fixed with the second mounting plate.
6. a kind of ring network cabinet faulty action preventing blocking device according to claim 5, characterized in that the fixed plate includes installation
Portion and placement section, the mounting portion are fixed with the second mounting plate by fixing screws, and the placement section includes horizontal curved folding part, erects
Straight bending part and extension, the extension are fixed with the second mounting plate by fixing screws, and the electromagnet assembly setting exists
Between vertical bending part and the second mounting plate.
7. a kind of ring network cabinet faulty action preventing blocking device according to claim 1 or 2 or 3 or 4, characterized in that the electromagnetism
Lock set is fixed with vertical bending part by attachment screw, and the attachment screw passes through mounting portion.
8. a kind of ring network cabinet faulty action preventing blocking device according to claim 1 or 2 or 3 or 4, characterized in that further include bullet
Spring, one end of the spring are connect with the first mounting plate, and the other end is connect with closed plate.
9. a kind of ring network cabinet faulty action preventing blocking device according to claim 1 or 2 or 3 or 4, characterized in that the closing
Plate and mounting plate are fixed by lock-screw.
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CN201810681723.0A CN109473308A (en) | 2018-06-27 | 2018-06-27 | A kind of ring network cabinet faulty action preventing blocking device |
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CN201810681723.0A CN109473308A (en) | 2018-06-27 | 2018-06-27 | A kind of ring network cabinet faulty action preventing blocking device |
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JP2000341812A (en) * | 1999-05-26 | 2000-12-08 | Terasaki Electric Co Ltd | Interlock unit in storing box for draw out type circuit breaker |
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CN204029653U (en) * | 2014-08-05 | 2014-12-17 | 厦门市海悦电气设备有限公司 | A kind of earthing anti-misoperation apparatus |
CN205140808U (en) * | 2015-09-01 | 2016-04-06 | 希格玛电气(珠海)有限公司 | Interlock is operated with ground connection to looped netowrk cabinet |
CN205230875U (en) * | 2015-11-23 | 2016-05-11 | 湖南平高开关有限公司 | Earthing switch interlock and adopt this earthing switch interlock's cubical switchboard |
CN207183119U (en) * | 2017-07-26 | 2018-04-03 | 南京开关厂有限公司 | Switch cabinet grounding switch electrified locking device |
CN107905641A (en) * | 2017-10-10 | 2018-04-13 | 国网浙江省电力公司衢州供电公司 | A kind of switchgear anti-misoperation locking device |
CN208589371U (en) * | 2018-06-27 | 2019-03-08 | 浙江时通电气制造有限公司 | A kind of ring network cabinet faulty action preventing blocking device |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2000341812A (en) * | 1999-05-26 | 2000-12-08 | Terasaki Electric Co Ltd | Interlock unit in storing box for draw out type circuit breaker |
CN202839367U (en) * | 2012-08-31 | 2013-03-27 | 施耐德电器工业公司 | Locking mechanism of ring main unit and ring main unit |
CN203192636U (en) * | 2013-03-20 | 2013-09-11 | 江苏帝一集团有限公司 | Misoperation prevention mechanism for ring network cabinet |
CN203334806U (en) * | 2013-06-21 | 2013-12-11 | 海盐县供电局 | Mistakenly-locking resistant lock device |
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CN205140808U (en) * | 2015-09-01 | 2016-04-06 | 希格玛电气(珠海)有限公司 | Interlock is operated with ground connection to looped netowrk cabinet |
CN205230875U (en) * | 2015-11-23 | 2016-05-11 | 湖南平高开关有限公司 | Earthing switch interlock and adopt this earthing switch interlock's cubical switchboard |
CN207183119U (en) * | 2017-07-26 | 2018-04-03 | 南京开关厂有限公司 | Switch cabinet grounding switch electrified locking device |
CN107905641A (en) * | 2017-10-10 | 2018-04-13 | 国网浙江省电力公司衢州供电公司 | A kind of switchgear anti-misoperation locking device |
CN208589371U (en) * | 2018-06-27 | 2019-03-08 | 浙江时通电气制造有限公司 | A kind of ring network cabinet faulty action preventing blocking device |
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Application publication date: 20190315 |
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