CN105644795B - One kind rotatably divides plug in temperature barrier - Google Patents
One kind rotatably divides plug in temperature barrier Download PDFInfo
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- CN105644795B CN105644795B CN201410650781.9A CN201410650781A CN105644795B CN 105644795 B CN105644795 B CN 105644795B CN 201410650781 A CN201410650781 A CN 201410650781A CN 105644795 B CN105644795 B CN 105644795B
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- rotating shaft
- solar heat
- bottom shield
- cover plate
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Abstract
The invention belongs to hypersonic aircraft technical field, rotatably divide plug in temperature barrier more particularly to one kind, wherein divide to insert and be arranged on the shield of bottom, the upper surface of bottom shield is provided with the positive stop strip of strip, solar heat protection cover plate be used to covering point side of plugging avoid point it is slotting directly washed away by hot-fluid, rotating shaft be middle part with stepped cylinder, the top of rotating shaft is on the shield of bottom, middle part ladder is located at the bottom of bottom shield, and torsion spring is arranged on the bottom of rotating shaft；Sleeve is enclosed on outside rotating shaft bottom, is fixed on bottom shield lower surface；Cover is connected with sleeve bottom；Aperture is provided with cover, the free end of torsion spring passes through the aperture of cover.Beneficial effect：Using solar heat protection cover plate, rotating shaft, screw, torsion spring, sleeve, adjust pad, cover to a point reeve row thermal protection.Available for aircraft bottom shield or aircraft bay section other exposed point of slotting thermal protection.This structure has the advantages that connection is reliable, structure is compact, effective, high temperature resistant.
Description
Technical field
The invention belongs to hypersonic aircraft technical field, and in particular to one kind rotatably divides plug in temperature barrier.
Background technology
Due to hypersonic aircraft by aerodynamic force in endoatmosphere flying for long time, Aerodynamic Heating is serious, persistently, meeting
A series of adverse effects are produced to Flight Vehicle Structure.Therefore, it is necessary to carry out Flight Vehicle Structure body and its relevant device, connector
Thermal protection.Bottom shield is located at whole aircraft bottom, and for socking in, device bottom thermal current enters aircraft interior, and pacifies
Fill the equipment such as aircraft attitude control dynamical system equipment, sensor, converter, breakaway plug, socket.Due to aircraft bottom power heat
Harsh environmental conditions, bottom shield is by high hot-fluid, high speed, high dynamic pressure air scour, it is necessary to carries out bottom shield and bottom shield
The thermal protection measure of the equipment such as upper equipment and breakaway plug, socket.Slotting (including separation socket or plug) is divided to be located at aircraft bottom
Portion, for connecting the cable system between aircraft and vehicle, transmit electric signal.After vehicle separates with Flight Vehicle Structure,
The connector of cable system will also separate in the presence of electromagnetic force or mechanical tensile forces between connection aircraft and vehicle, to realize
The overall separation of aircraft and vehicle.For aircraft, after being separated with vehicle, whole point insert will be directly exposed to it is winged
Row device bottom, is washed away by bottom thermal current.If thermal environment is severe, point phenomenon for inserting short circuit or burn-through is will appear from, will be led
Cause phenomena such as aircraft electrical signal is disorderly, thermal current enters in cabin to occur, to the failure of whole bringing on a disaster property of aircraft, also will
Directly affect flight success or failure.
Divide slotting conventional thermal protection measure mainly by point slotting self structure to resist extraneous Aerodynamic Heating, when plug, socket
After separation, inserting structure is divided to realize the short-circuit protection of electric signal automatically under electromagnetic force, preventing from being heated, it is disorderly electric signal occur
Disorderly.However, work as Aerodynamic Heating bad environments, it is this only by point slotting self structure active heat resistanceheat resistant when aircraft bottom temp is too high
Mode, easily cause whole point to insert and be burned, burn, and then influence the normal flight of aircraft.Accordingly, it is desirable to provide a kind of should
Point plug in temperature barrier on hypersonic aircraft.
The content of the invention
It is an object of the invention to for a point slotting thermal protection problem, there is provided one kind rotatably divides plug in temperature barrier.
Realize the technical scheme of the object of the invention：
One kind rotatably divides plug in temperature barrier, including bottom shield, point slotting, solar heat protection cover plate, rotating shaft, sleeve, torsion spring and cylinder
Lid；
A point of slotting mounting hole is provided with the shield of bottom, its shape is adapted with dividing to insert；A through hole is also provided with the shield of bottom,
For installing rotating shaft；The upper surface of bottom shield is provided with the positive stop strip of strip, for limiting the clockwise rotation of solar heat protection cover plate
Angle, the length of positive stop strip are more than a point slotting diameter；Divide and insert in point slotting mounting hole of bottom shield；Solar heat protection cover plate includes master
Body portion and an installation are bright, and solar heat protection cover plate main body part is used to cover point side of plugging, avoid point it is slotting directly washed away by hot-fluid,
Install and bright solar heat protection cover plate is arranged on by bottom shield by screw or pin and rotating shaft；Rotating shaft be middle part with stepped cylinder,
The top of rotating shaft is arranged in the shaft mounting hole of bottom shield, and the ladder in the middle part of rotating shaft is located at the bottom of bottom shield, torsion spring installation
In the bottom of rotating shaft；Sleeve is enclosed on outside rotating shaft bottom, has upper journal and down journal, and the table of bottom shield is fixed on by upper journal
Face；Cover is fixedly connected with the down journal of sleeve bottom；Aperture is provided with cover, the free end of torsion spring passes through the aperture of cover.
Limited block is additionally provided with the bottom shield, angle is rotated counterclockwise for limiting solar heat protection cover plate.
The solar heat protection cover plate installs the shaft mounting hole for being provided with bright and being adapted with configured rotation shaft, installs and is also provided with bright
Through the screw hole of shaft mounting hole；Rotating shaft sequentially passes through solar heat protection cover plate and bottom shield, and screw fixes solar heat protection cover plate with rotating shaft
Connection.
The installation of the solar heat protection cover plate is bright to be fixedly connected with solar heat protection cover plate with rotating shaft by pin.
The screw is refractory metal material.
The screw thread position of the screw smears high-temperature-resisting silicon rubber with head of screw position.
The thickness of the solar heat protection cover plate main body part, which is less than, installs bright, positive stop strip length and shape with one with bottom shield
The adaptable spacing side of shape, remainder can be arc-shaped edges or other shapes；Side of the main part in addition to spacing side
The lower surface of edge has outer.
The cover has the connecting lugs being adapted with sleeve bottom shape and middle part plectane.
The cover is rotated when mounted, and then with sleeve connection, initial torsion angle is provided for torsion spring.
Adjust pad is additionally provided between ladder in the middle part of the bottom shield and rotating shaft, to adjust at the ladder of rotating shaft and bottom
Gap between shield.
The rotating shaft be middle part carry externally threaded cylinder, middle part is connected with self-locking nut, for adjust bottom shield and
Gap between solar heat protection cover plate.
The beneficial effects of the present invention are：
The present invention's rotatably divides plug in temperature barrier using solar heat protection cover plate, rotating shaft, screw, torsion spring, sleeve, adjusting pad
Piece, cover are to a point reeve row thermal protection.Available for aircraft bottom shield or aircraft bay section other exposed point of slotting heat
Protect, can prevent that conventional at present point is inserted by under the conditions of the high hot-fluid in aircraft bottom, high speed, high dynamic pressure Aerodynamic Heating, is divided and is inserted
The phenomenon burn out, burnt occurs.Meanwhile point plug in temperature barrier that the present embodiment provides can be used for being also exposed to high fever
The place to dividing the device such as slotting to carry out thermal protection is needed under the similar adverse circumstances such as stream, high speed, high dynamic pressure load.This structure has
The advantages that connection is reliable, structure is compact, effective, high temperature resistant.
Brief description of the drawings
Fig. 1 is the structural representation of the plug in temperature barrier of the present invention point；
Fig. 2 is the schematic diagram of the plug in temperature barrier open mode of the present invention point；
Fig. 3 is the schematic diagram of the plug in temperature barrier closed mode of the present invention point；
Fig. 4 installs initial position schematic diagram for the present invention point plug in temperature barrier sleeve and cover；
Fig. 5 installs initial position schematic diagram for the present invention point plug in temperature barrier sleeve and cover；
Fig. 6 is Fig. 1 midsole shield partial structural diagrams；
In figure, 1- bottoms shield, 2- points are inserted, 3- solar heat protection cover plates, 4- screws, 5- rotating shafts, 6- adjust pads, 7- sleeves, and 8- is turned round
Spring, 9- covers, 10- positive stop strips, 11- upper journals, 12- down journals.
Arrow represents the direction of rotation of cover during installation in Fig. 4.
Embodiment
Below exemplified by, the invention will be further described in conjunction with the accompanying drawings and embodiments.
Present embodiments provide one kind and rotatably divide plug in temperature barrier, its structure is as shown in figure 1, including bottom shield 1, divide
Insert 2, solar heat protection cover plate 3, rotating shaft 5, adjust pad 6, sleeve 7, torsion spring 8 and cover 9；
Bottom shield 1 is slab construction, different according to the shape for the bottom shield 1 for being actually needed different aircraft；On bottom shield 1
A point of slotting mounting hole is provided with, its shape is adapted with dividing slotting 2；A through hole is also provided with bottom shield 1, for installing rotating shaft 5；
The upper surface of bottom shield 1 is provided with the positive stop strip 10 of strip, spacing for limiting 3 clockwise rotational angle of solar heat protection cover plate
The length of bar 10, which is more than, divides the diameter for inserting 2；Limited block can also be set on bottom shield 1, as shown in fig. 6, to limit solar heat protection lid
The rotational angle that plate 3 is counterclockwise, realize the limitation to the rotation position of solar heat protection cover plate 3.
Point insert 2 can be breakaway plug or separation socket, according to the actual installation of aircraft it needs to be determined that；Such as Fig. 1 and Fig. 2
It is shown, divide slotting 2 to be tightly fastened in point slotting mounting hole of bottom shield 1.
Solar heat protection cover plate 3 include main part and an installation it is bright, its shape as shown in Figures 2 and 3, the main body of solar heat protection cover plate 3
Part, which is used to cover point, inserts 2 tops, avoids points slotting 2 from directly being washed away by hot-fluid；Install bright for passing through rotating shaft 5 by solar heat protection cover plate
3 are arranged on bottom shield 1.Install be provided with bright with the shape of rotating shaft 5 be adapted shaft mounting hole, installation it is bright on be also provided with one or
Two screw holes for being horizontally through shaft mounting hole；Rotating shaft 5 sequentially passes through solar heat protection cover plate 3 and bottom shield 1, and two screws 4 pass through
Solar heat protection cover plate 3 installs the screw hole on bright screw hole and rotating shaft 5, and rotating shaft 5 is fixedly connected with solar heat protection cover plate 3；It can also lead to
It is bright radially across rotating shaft 5 and the installation of solar heat protection cover plate 3 to cross pin；The material of screw 4 can be the high temperature resistants such as GH4169, GH2132 gold
Belong to material, screw 4 uses 2, is mutually redundant design altogether in the present embodiment, to strengthen connection reliability, is filled in this thermal protection
After the completion of putting assembling, high-temperature-resisting silicon rubber is smeared further to be carried out to screw 4 in screw thread position and the head of screw position of screw 4
Thermal protection, screw 4 can select according to the size of structure itself between M3 to M8.
The thickness of the main part of solar heat protection cover plate 3, which is less than, installs bright, the positive stop strip length and shape with one with bottom shield 1
Adaptable spacing side, remainder can be arc-shaped edges or other shapes；Edge of the main part in addition to spacing side
Lower surface there is outer, the height of outer is allowed to press close to bottom shield 1, avoid hot-fluid enter solar heat protection cover plate 5 and point insert 2 between
Gap.
Rotating shaft 5 is that middle part is more than upper and lower part body diameter, rotating shaft with stepped cylinder, the diameter of middle part ladder
5 top is arranged in the shaft mounting hole of bottom shield 1, and rotating shaft top is provided with one or two radial screw bore；The middle part of rotating shaft 5
Ladder be located at the bottom of bottom shield 1；Torsion spring 8 is arranged on the bottom of rotating shaft 5, and fixing end is arranged under the middle part ladder of rotating shaft 5
In the torsion spring mounting hole on surface；Sleeve 7 is enclosed on outside the bottom of rotating shaft 5, has upper journal 11 and down journal 12, solid by upper journal 11
The surface of bottom shield 1 is scheduled on, as shown in Figure 4 and Figure 5；The shape of cover 9 as shown in Figure 4 and Figure 5, has and the bottom shape of sleeve 7
The adaptable connecting lugs of shape and middle part plectane, there is through hole on the plectane of middle part, for passing through the bottom of rotating shaft 5, connection is propped up
Ear is fixedly connected with the down journal 12 of the bottom of sleeve 7, and provides support and initial torsion angle for torsion spring 8；It is provided with cover 9 small
Hole, pass through the free end of torsion spring 8.When mounted, after torsion spring 8 passes through aperture, cover 9 is turned clockwise,
Until the connecting lugs of cover 9 are alignd with the down journal of sleeve 7.The anglec of rotation of cover 9 can be carried out by the position of aperture
Design, the anglec of rotation of cover 9 is controlled by aperture position on cover 9, and then control the initial torsion angle of torsion spring 8, so as to control
The initial pre- moment of torsion of torsion spring 8.Illustrate as shown in Figure 4, Figure 5 before cover 9 rotates and after rotating.
Because the gross thickness of bottom shield 1 is determined by its metal base plate thickness, anti-insulation thickness, bondline thickness, gross thickness
Size is difficult to accurately determine, therefore, the temperature barrier of the present embodiment is provided with adjust pad 6, to adjust at the ladder of rotating shaft 5
The size in gap between bottom shield 1, ensure that solar heat protection cover plate 3 and the outer surface of bottom shield 1 have certain gap by gap
Value, when preventing FLIGHT VEHICLE VIBRATION, vibrated between bottom shield 1 and solar heat protection cover plate 3 it is excessive/prevent solar heat protection cover plate 3 from being pressed with bottom shield 1
Extremely, the frictional force that solar heat protection cover plate 3 rotates on the outer surface of bottom shield 1 is reduced.Gap d value can arrive according to being actually needed 0.1
Selected between 1.In addition it is also possible to carry externally threaded cylinder by the way that rotating shaft 5 is arranged into middle part, middle part is connected with self-locking spiral shell
Mother replaces at the ladder in the rotating shaft 5 of the present embodiment, is adjusted by adjusting self-locking nut between bottom shield and solar heat protection cover plate 3
Gap.
Torsion spring can select left-handed or right-handed spiral configuration according to practical structures feature, and its one end is goed deep at the ladder of rotating shaft 5
In aperture, rotated with rotating shaft, one end is goed deep into fixed in the aperture on cover 9.The structure that one end rotates one end fixation can be with
Driving force is provided to whole rotating mechanism.The torsion that torsion spring is provided can be set according to the rotary inertia of total itself
Meter, and certain nargin is left, ensure in the case where oscillating load acts on, the driving force of torsion spring 8 can maintain solar heat protection cover plate 3 not turn
It is dynamic.This structure, torsion spring are arranged on inside aircraft nacelle (inner side of bottom shield 1), prevent torsion spring 8 from being rushed by high temperature hot gas stream
Brush, ensure that the reliability and validity of torsion spring 8.
When mounted, adjust pad 5 is enclosed in rotating shaft 5 from the top down first, rotating shaft 5 is passed through on bottom shield 1
It is arranged on for the through hole of rotating shaft, then by solar heat protection cover plate 3 in rotating shaft 5, solar heat protection cover plate 3 and rotating shaft 5 is linked as one by screw 4
Body；Then installation sleeve 7, while torsion spring 8 is arranged on the lower outside of rotating shaft 5, then torsion spring 8 and rotating shaft 5 are turned over into cover 9 respectively
Corresponding through hole, then cover 9 and sleeve 7 are fixedly mounted.
After aircraft separates with vehicle, connector is separated, and solar heat protection cover plate 3 will entirely divide slotting under the driving of torsion spring 8
3 cover and protect, as shown in schematic diagram 3.
Solar heat protection cover plate 3 and the material of rotating shaft 5 can be molded quartz phenolic aldehyde, the high silica of molding, three-dimensional quartz, C/C, C/
The refractory metal material such as the high temperature resistant composites such as SiC or high temperature alloy.
Point plug in temperature barrier that the present embodiment provides on the shield of hypersonic aircraft bottom points is inserted 2 provide it is reliable,
Effective thermal protection, it can prevent that conventional at present point is inserted 2 by the high hot-fluid in aircraft bottom, high speed, high dynamic pressure Aerodynamic Heating bar
Under part, point slotting 2 phenomenon generations for burning out, burning.Meanwhile point plug in temperature barrier that the present embodiment provides can be used for equally
Needed under the similar adverse circumstances such as high hot-fluid, high speed, high dynamic pressure load to a point ground for the slotting progress of the devices such as 2 thermal protection
Side.
The beneficial effect for rotatably dividing plug in temperature barrier that the present embodiment provides is：
1st, because hypersonic aircraft bottom is available by high hot-fluid, high speed, the effect of high dynamic pressure aerodynamic loading, this invention
In aircraft bottom shield or aircraft bay section other exposed point of slotting thermal protection；
2nd, this technology realize the high hot-fluid in aircraft bottom, high speed, high dynamic pressure aerodynamic loading act on lower point it is slotting it is reliable, have
Imitate thermal protection；
3rd, temperature barrier is gone using solar heat protection cover plate, rotating shaft, screw, torsion spring, sleeve, adjust pad, cover to a point reeve
Thermal protection, after ensure that aircraft separates with vehicle, point insert 2 bottom harsh thermal environmental load effect under occur without burn out,
Phenomena such as burn-through.This structure has the advantages that connection is reliable, structure is compact, effective, high temperature resistant.
Embodiments of the invention are explained in detail above.Obviously, above-mentioned embodiment is only the optimal reality of the present invention
Example is applied, but the present invention is not limited to above-described embodiment.In those of ordinary skill in the art's possessed knowledge, may be used also
So that various changes can be made on the premise of present inventive concept is not departed from.If these modifications and variations belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to comprising including these changes and modification.
Claims (8)
1. one kind rotatably divides plug in temperature barrier, it is characterised in that：Including bottom shield (1), point insert (2), solar heat protection cover plate (3),
Rotating shaft (5), sleeve (7), torsion spring (8) and cover (9)；A point of slotting mounting hole is provided with bottom shield (1), its shape is inserted with dividing
(2) it is adapted；A through hole is also provided with bottom shield (1), for installing rotating shaft (5)；The upper surface of bottom shield (1) is provided with length
The positive stop strip (10) of strip, for limiting solar heat protection cover plate (3) clockwise rotational angle, the length of positive stop strip (10), which is more than to divide, inserts
(2) diameter；Divide and insert (2) in point slotting mounting hole of bottom shield (1)；Solar heat protection cover plate (3) includes main part and one
Install bright, solar heat protection cover plate (3) main part, which is used to cover point, inserts above (2), avoids point slotting (2) from directly being washed away by hot-fluid, peace
Fill and bright solar heat protection cover plate (3) is arranged on by bottom shield (1) by screw (4) or pin and rotating shaft (5)；Rotating shaft (5) carries for middle part
The cylinder of ladder, the top of rotating shaft (5) are arranged in the shaft mounting hole of bottom shield (1), and the ladder in the middle part of rotating shaft (5) is located at
The bottom of bottom shield (1), torsion spring (8) are arranged on the bottom of rotating shaft (5)；Sleeve (7) is enclosed on outside rotating shaft (5) bottom, has upper branch
Ear (11) and down journal (12), the surface of bottom shield (1) is fixed on by upper journal (11)；Cover (9) and sleeve (7) bottom
Down journal (12) is fixedly connected；Aperture is provided with cover (9), torsion spring (8) passes through the aperture of cover (9)；The cover (9) is being pacified
Rotated during dress, be then connected with sleeve (7), initial torsion angle is provided for torsion spring (8).
2. one kind as claimed in claim 1 rotatably divides plug in temperature barrier, it is characterised in that：On the bottom shield (1) also
Limited block is provided with, angle is rotated counterclockwise for limiting solar heat protection cover plate (3).
3. one kind as claimed in claim 1 rotatably divides plug in temperature barrier, it is characterised in that：The solar heat protection cover plate (3)
The shaft mounting hole for being provided with bright and being adapted with rotating shaft (5) shape is installed, the spiral shell being also provided with bright through shaft mounting hole is installed
Nail；Rotating shaft (5) sequentially passes through solar heat protection cover plate (3) and bottom shield (1), and screw (4) is fixed by solar heat protection cover plate (3) and rotating shaft (5)
Connection.
4. one kind as claimed in claim 1 rotatably divides plug in temperature barrier, it is characterised in that：The screw thread of the screw (4)
High-temperature-resisting silicon rubber is smeared with head of screw position in position.
5. one kind as claimed in claim 1 rotatably divides plug in temperature barrier, it is characterised in that：The solar heat protection cover plate (3) is main
The thickness of body portion, which is less than, installs bright, to be adapted with one with the positive stop strip length and shape of bottom shield (1) spacing side；
The lower surface at edge of the main part in addition to spacing side has outer.
6. one kind as claimed in claim 1 rotatably divides plug in temperature barrier, it is characterised in that：The cover (9) have with
The adaptable connecting lugs of sleeve (7) bottom shape and middle part plectane.
7. one kind as claimed in claim 1 rotatably divides plug in temperature barrier, it is characterised in that：The bottom shield (1) is with turning
Adjust pad (6) is additionally provided between ladder in the middle part of axle (5), to adjust at the ladder of rotating shaft (5) between bottom shield (1)
Gap.
8. one kind as claimed in claim 1 rotatably divides plug in temperature barrier, it is characterised in that：The rotating shaft (5) is arranged to
Middle part carries externally threaded cylinder, and middle part is connected with self-locking nut to replace at the ladder in rotating shaft (5), by adjusting self-locking
Nut adjusts the gap between bottom shield and solar heat protection cover plate (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410650781.9A CN105644795B (en) | 2014-11-15 | 2014-11-15 | One kind rotatably divides plug in temperature barrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410650781.9A CN105644795B (en) | 2014-11-15 | 2014-11-15 | One kind rotatably divides plug in temperature barrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105644795A CN105644795A (en) | 2016-06-08 |
| CN105644795B true CN105644795B (en) | 2017-11-28 |
Family
ID=56480062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410650781.9A Active CN105644795B (en) | 2014-11-15 | 2014-11-15 | One kind rotatably divides plug in temperature barrier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105644795B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB975559A (en) * | 1960-06-16 | 1964-11-18 | Dunlop Rubber Co | Fusible plug assembly |
| DE2254222A1 (en) * | 1972-11-06 | 1974-05-16 | Merten Geb | HINGED LID FOR ELECTRICAL INSTALLATION DEVICES |
| US5489074A (en) * | 1993-04-01 | 1996-02-06 | Societe Europeenne De Propulsion | Thermal protection device, in particular for an aerospace vehicle |
| CN2308171Y (en) * | 1997-07-28 | 1999-02-17 | 李玉昆 | Safety cover for socket |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8222165B2 (en) * | 2008-10-27 | 2012-07-17 | Pratt & Whitney Canada Corp. | Composite fire shield |
-
2014
- 2014-11-15 CN CN201410650781.9A patent/CN105644795B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB975559A (en) * | 1960-06-16 | 1964-11-18 | Dunlop Rubber Co | Fusible plug assembly |
| DE2254222A1 (en) * | 1972-11-06 | 1974-05-16 | Merten Geb | HINGED LID FOR ELECTRICAL INSTALLATION DEVICES |
| US5489074A (en) * | 1993-04-01 | 1996-02-06 | Societe Europeenne De Propulsion | Thermal protection device, in particular for an aerospace vehicle |
| CN2308171Y (en) * | 1997-07-28 | 1999-02-17 | 李玉昆 | Safety cover for socket |
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| Publication number | Publication date |
|---|---|
| CN105644795A (en) | 2016-06-08 |
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