CN217881280U - Shunt clamp for heating and live-line processing of transformer disconnecting link contact - Google Patents
Shunt clamp for heating and live-line processing of transformer disconnecting link contact Download PDFInfo
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- CN217881280U CN217881280U CN202222144552.2U CN202222144552U CN217881280U CN 217881280 U CN217881280 U CN 217881280U CN 202222144552 U CN202222144552 U CN 202222144552U CN 217881280 U CN217881280 U CN 217881280U
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Abstract
The utility model relates to a transformer switch contact generates heat and takes electric treatment reposition of redundant personnel anchor clamps, first installation department and second installation department including electrically conductive material, install first installation department or second installation department respectively at switch static contact rocking arm through fixture, on the switch moving contact rocking arm, be provided with respectively on first installation department and the second installation department and electrically conduct the clamp and lead electrical pillar, electrically conduct and press from both sides one side and be provided with the opening that supplies to lead the electrical pillar business turn over, it follows the opening that transformer switch moving contact and the electrically conductive clamp of passing in and out of transformer switch static contact and open and shut to lead electrical pillar, when switch static contact and moving contact generate heat, can be under the electrified circumstances, through the live working mode installation reposition of earth potential reposition of redundant personnel anchor clamps, avoid generating heat between moving contact and the static contact and worsen, when treating that equipment has a planned power failure, overhaul the contact. The conductive clamp and the conductive column can be automatically separated along with the disconnecting link when being separated, and the vicious event caused by the fact that the disconnecting link cannot be opened under the emergency condition is effectively avoided.
Description
Technical Field
The utility model relates to a transformer switch contact generates heat and handles reposition of redundant personnel anchor clamps with electricity belongs to electric power tech field.
Background
The high-voltage disconnecting link of the substation is one of the most common electrical devices in the power grid and the most used electrical devices, wherein the moving contact and the static contact are the weakest parts of the disconnecting link, and due to the reasons of long-time operation, improper maintenance and the like, the phenomena of poor contact, heating, arc discharge and the like between the moving contact and the static contact occur, and the phenomena of non-power failure cannot be handled, so that the safe operation of the power grid is threatened.
If the power is not timely processed, the contact is possibly burnt to cause power failure accidents, the existing disconnecting link contact generates heat, and the static contact arm and the movable contact arm of the disconnecting link can be opened for maintenance only after the equipment is powered off, so that the power consumption of social production and life is influenced; in order to avoid influencing electricity consumption in social production, a shunt clamp needs to be arranged between the moving contact and the fixed contact to shunt current.
When an emergency occurs, the moving contact and the fixed contact of the disconnecting link need to be separated, however, the moving contact and the fixed contact are limited and fixed to be connected into a whole by installing the shunt clamp, and a vicious event that the moving contact and the fixed contact cannot be separated is caused; there is therefore a need for an improved shunt clamp.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a transformer switch contact generates heat and handles reposition of redundant personnel anchor clamps with electricity to solve the problem that proposes in the above-mentioned background art.
The technical scheme of the utility model as follows:
the utility model provides a transformer switch contact generates heat and takes electric treatment reposition of redundant personnel anchor clamps, includes electrically conductive material's first installation department and second installation department, all be provided with fixture on first installation department and the second installation department, install respectively on isolator static contact rocking arm, isolator moving contact rocking arm through fixture with the first installation department or the second installation department that correspond, be provided with respectively on first installation department and the second installation department and electrically conduct the clamp and lead electrical pillar, electrically conduct the clamp and lead electrical connection cooperation of electrical pillar, electrically conduct and press from both sides one side and be provided with the opening that supplies to lead the electrical pillar business turn over, it follows transformer switch moving contact and transformer switch static contact business turn over to lead electrical pillar the opening that presss from both sides.
Preferably, the conductive clip is of a U-shaped structure made of elastic materials.
Preferably, two ends of the conductive clip of the U-shaped structure are bent outwards.
Preferably, fixture is including fixed setting at the electrically conductive locking claw that corresponds first installation department or second installation department upper portion, with the adjusting screw who corresponds first installation department or second installation department threaded connection, adjusting screw one end is connected with movable locking claw, and is rotatory adjusting screw drives movable locking claw and is close to or keeps away from the electrically conductive locking claw that corresponds.
Preferably, it includes fixed part and movable part to lead electrical pillar, be provided with the elastic component between fixed part and the movable part, the movable part compresses tightly on the fixed part through the threaded rod.
Preferably, a positioning part made of an insulating material is detachably mounted on the first mounting part or the second mounting part, and the shape of the positioning part is matched with the interval between the rotating arm of the fixed contact of the disconnecting link and the rotating arm of the movable contact of the disconnecting link.
Preferably, be provided with the holder in the location portion, be provided with the guide on the holder, the guide way has been seted up on first installation department or the second installation department, guide and guide way sliding fit, be provided with rings on the holder.
Preferably, all seted up the draw-in groove on first installation department and the second installation department, be provided with the diaphragm of laminating with first installation department, second installation department simultaneously, be provided with at least two sets of card posts on the diaphragm, card post is from up inserting down can dismantle in joint complex draw-in groove, install the retaining member on the diaphragm, the retaining member is used for pressing from both sides the tight action bars of fixing in the outside.
Preferably, the outward bulge of retaining member lateral wall is provided with a plurality of annular array's antiskid.
Preferably, the clamping column is provided with an elastic piece, and the elastic piece is elastically abutted against the inner side wall of the corresponding clamping groove through elastic force of the elastic piece.
An operation method for a shunt clamp for heating and live-line processing of a transformer disconnecting link contact comprises the following steps:
s1, removing an oxide layer on a rotating arm of a moving contact of a disconnecting link of a static contact rotating arm of the disconnecting link;
s2, tightly connecting the conductive column with the conductive clamp;
s3, fixedly installing the flush part on the insulating operating rod, and then installing the first installation part and the second installation part on the flush part;
s4, lifting the insulating operating rod to hang the first mounting part and the second mounting part on the corresponding rotating arm of the fixed contact of the disconnecting link and the rotating arm of the moving contact of the disconnecting link, and positioning through the positioning part, so that the positions of the conductive clip and the conductive column are superposed with the dividing point of the moving contact and the fixed contact of the disconnecting link;
s5, operating the clamping mechanism by using an insulating operating rod to fix the corresponding first installation part and the second installation part;
and S6, the positioning part and the flush part are drawn away by using an insulating operating rod.
The utility model discloses following beneficial effect has:
the shunt clamp can be installed in a live working mode of over ground potential under the live condition, so that the heating phenomenon between the moving contact and the static contact is avoided, and the contact is repaired when the equipment is scheduled to have power failure.
The conductive clamp and the conductive column can be automatically separated along with the disconnecting link when being separated, and the vicious event caused by the fact that the disconnecting link cannot be opened under the emergency condition is effectively avoided.
This anchor clamps need not the equipment and have a power failure, need not to drop load or change the load, can adopt the live working mode of ground potential under the electrified circumstances of switch, uses insulating bar, stands and to install reposition of redundant personnel anchor clamps in switch contact both sides on ground, with moving contact and static contact short circuit, realize reposition of redundant personnel, the effect of cooling.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic view of the separation structure of the present invention;
FIG. 3 is a schematic view of another directional structure of FIG. 2;
fig. 4 is a schematic view of the opening and closing structure of the conductive clip and the conductive post of the present invention;
FIG. 5 is a schematic view of an application site of the present invention;
fig. 6 is a schematic structural view of the shunt clamp, the positioning portion and the leveling portion of the present invention;
fig. 7 is a schematic structural view of the positioning portion and the second mounting portion of the present invention;
fig. 8 is a schematic view of the structure of the flush portion of the present invention.
In the figures, the reference numbers are given by:
1. a first mounting portion; 2. a second mounting portion; 21. a card slot; 22. a guide groove; 3. adjusting the screw rod; 4. a movable locking claw; 5. a conductive clip; 6. a conductive post; 61. a fixed part; 62. a movable portion; 7. a conductive locking claw; 8. a rotating arm of a fixed contact of the disconnecting link; 9. a rotating arm of a knife switch moving contact; 10. a positioning part; 101. a clamping member; 102. a guide member; 103. a hoisting ring; 11. a flush portion; 111. a transverse plate; 112. a locking member; 113. an anti-slip member; 114. clamping the column; 115. an elastic member.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-4, the first mounting part 1/second mounting part 2 structure is similar to an "L" type structure, a corresponding conductive locking claw 7 is formed on the upper portion of the first mounting part 1/second mounting part 2, the adjusting screw 3 is in threaded connection with the lower portion of the corresponding first mounting part 1/second mounting part 2, the upper end of the adjusting screw 3 is movably connected with the movable locking claw 4, the movable locking claw 4 is attached to the side wall of the corresponding first mounting part 1/second mounting part 2, so that the adjusting screw 3 is rotated to drive the movable locking claw 4 to vertically and linearly move on the side wall of the corresponding first mounting part 1/second mounting part 2, and the purpose of approaching or leaving the corresponding conductive locking claw 7 is achieved.
The movable locking claw 4, the conductive locking claw 7 and the corresponding first mounting part 1/second mounting part 2 form a structure similar to a 'C'. The lower end of the adjusting screw rod 3 is of an outer hexagonal structure, so that an external tool can be driven to rotate conveniently.
The lower end of the first mounting part 1 is electrically connected with a conductive clip 5, the conductive clip 5 can be made of copper materials and has certain elastic deformation capacity, and the conductive clip 5 is in a U-shaped structure and forms an opening in one direction;
the lower end of the second mounting part 2 is electrically connected with a conductive column 6, the conductive column 6 comprises a fixed part 61 and a movable part 62, the fixed part 61 is fixed on the second mounting part 2, the movable part 62 is mounted on the fixed part 61 through a metal threaded rod, a plurality of elastic members (not shown in the drawing, and strong compression springs can be adopted) are arranged between the fixed part 61 and the movable part 62, and the elastic force of the elastic members drives the movable part 62 to tend to be away from the fixed part 61; the fixed part 61 merges the back with movable part 62 and is an approximate cylinder (with electrically conductive 5 inner chamber structures looks adaptations), guarantees through the elastic component to lead the pressure of electrical pillar 6 and electrically conductive between the clamp 5, avoids leading electrical pillar 6 and electrically conductive the metal contact pressure between the clamp 5 not enough, influences the through-current performance. However, the pressure should not be too high, and the clamping force between the conductive post 6 and the conductive clamp 5 will affect the opening of the knife switch, and even the knife switch cannot be opened, so that the distance between the fixed part 61 and the movable part 62 can be adjusted by rotating the threaded rod.
Because the first installation part 1 and the second installation part 2 are made of conductive materials, the first installation part 1 is electrically connected with the rotating arm 8 of the fixed contact of the disconnecting link, the second installation part 2 is electrically connected with the rotating arm 9 of the moving contact of the disconnecting link, and the conductive column 6 is electrically connected with the conductive clamp 5, so that the moving contact sequentially passes through the conductive locking claw 7, the first installation part 1, the conductive clamp 5, the conductive column 6, the second installation part 2 and the conductive locking claw 7 to be electrically connected with the fixed contact, and the effect of flow guiding is achieved. Such as the solid line portion of fig. 4.
When the clamp is used, a worker clamps the conductive column 6 into the conductive clamp 5 on the ground, as shown in fig. 1, two groups of conductive locking claws 7 are positioned above the clamp, then the first mounting part 1 and the second mounting part 2 are supported by using the insulating support rods, the clamp is lifted, so that the two groups of conductive locking claws 7 are respectively hung on the rotating arm 8 of the fixed contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link, the rotating arm 8 of the fixed contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link are horizontally arranged rectangular rods, the horizontal separation can be prevented due to the inverted hooks of the conductive locking claws 7, then the adjusting screw 3 is driven to rotate by using an external tool and the outer hexagonal match of the lower part of the adjusting screw 3, and the conductive locking claws 7 and the movable locking claws 4 are matched and clamped and fixed on the rotating arm 8 of the fixed contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link.
Because the first installation part 1 and the second installation part 2 are made of conductive materials, the first installation part 1 is electrically connected with the moving contact, the second installation part 2 is electrically connected with the fixed contact, the conductive column 6 is electrically connected with the conductive clip 5, and the moving contact sequentially passes through the first installation part 1, the conductive clip 5, the conductive column 6 and the second installation part 2 to be electrically connected with the fixed contact, so that the effect of flow guiding is achieved. Such as the solid line portion of fig. 4.
The first mounting portion 1 and the second mounting portion 2 are symmetrical to each other except for the conductive clip 5 and the conductive post 6.
In an emergency, the moving contact and the fixed contact need to be separated, for example, the moving contact and the fixed contact are moved linearly or rotated to realize opening and closing, in the process, because the conductive clip 5 has an opening, the first mounting portion 1 rotates along with the moving contact and the rotating arm 8 of the moving contact of the disconnecting link, and the second mounting portion 2 rotates along with the fixed contact and the rotating arm 9 of the static contact of the disconnecting link, so that the conductive column 6 of the second mounting portion 2 is separated through the opening of the conductive clip 5, and the separation of the conductive column 6 and the conductive clip 5 is realized (for example, the dotted line portion in fig. 4).
The conductive clip 5 has elasticity, which is beneficial to the repeated clamping or separation of the conductive column 6 and the good butt joint.
As shown in fig. 6-7, in order to ensure that the positions of the conductive clip 5 and the conductive column 6 of the clamp coincide with the dividing point between the moving contact and the fixed contact of the disconnecting link, a positioning portion 10 is installed on the second installation portion 2, the positioning portion 10 is made of an insulating epoxy resin platelet, the shape of the positioning portion 10 is adapted to the interval between the rotating arm 8 of the fixed contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link, and the positioning portion 10 is inserted between the rotating arm 8 of the fixed contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link during installation to realize positioning;
the side wall of the positioning part 10 is fixedly connected with an integrated clamping piece 101, the structure of the clamping piece 101 is a U-shaped structure with a downward opening, the inner side wall of the clamping piece 101 is provided with a guide piece 102, the outer side wall of the second mounting part 2 is provided with a guide groove 22, and the positioning part 10 vertically slides relative to the second mounting part 2 through the matching of the guide piece 102 and the guide groove 22; the clamping piece 101 is hung on the second mounting part 2 under the action of self gravity of the positioning part 10, the clamping piece 101 and the like, and after the positioning part 10 is inserted between the rotating arm 8 of the fixed contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link to realize positioning, the clamping piece 101 is driven to vertically move upwards to separate from the second mounting part 2 by matching of an external edge operating rod and a hanging ring 103;
the positioning part 10 is installed on the second installation part 2 in a unique position through the cooperation of the guide piece 102 and the guide groove 22.
In order to ensure that the first installation part 1 and the second installation part 2 are kept parallel in the lifting process and avoid the displacement and the loosening of the conductive clamp 5 and the conductive column 6 of the clamp, the first installation part 1 and the second installation part 2 are connected into a whole in the lifting process through the positioning part 10;
the positioning part 10 comprises a transverse plate 111, two groups of clamping columns 114 fixed at the top of the transverse plate 111 and two groups of locking parts 112 fixed at the bottom wall of the transverse plate 111; when the clamping device is used, the transverse plate 111 is attached to the bottom walls of the first installation part 1 and the second installation part 2, one group of clamping columns 114 are vertically and upwards inserted into the clamping grooves 21 of the first installation part 1, the other group of clamping columns 114 are vertically and upwards inserted into the clamping grooves 21 of the second installation part 2, and the clamping columns 114 and the clamping grooves 21 are clamped through friction force;
the structure of the upper end of the insulating operating rod is the same as that of the locking part 112, and the upper end of the insulating operating rod is fixedly connected with the locking part 112 into a whole through a bolt-nut assembly 9 (the included angle formed by the insulating operating rod and the locking part 112 can be adjusted); in order to prevent the insulated operating rod and the locking member 112 from deviating after being locked, a circular array of anti-slip members 113 are convexly arranged on the side wall of the locking member 112 outwards, and the anti-slip members 113 on the side wall of the locking member 112 are matched with the anti-slip members 113 on the upper end of the insulated operating rod to realize anti-slip;
the elastic element 115 comprises a spring and a thimble, the thimble transversely and linearly slides in the corresponding clamping column 114, and the arc-shaped outer end of the thimble is tightly abutted with the inner side wall of the clamping groove 21 through the elastic force of the spring 115;
after the first mounting part 1 and the second mounting part 2 are hung on the corresponding rotating arm 8 of the fixed contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link and are locked, the transverse plate 111 is dragged to vertically fall down, so that the clamping column 114 vertically moves down to be separated from the corresponding clamping groove 21, and the parallel and level part 11 is separated from the shunting clamp.
The insulating operating rod drives the first installation part 1 and the second installation part 2 to synchronously lift by dragging the transverse plate 111 to lift.
When the contact of the disconnecting link has a heating defect and can not be powered off, equipment needs to be powered off, even a power-off bus of a power transformer needs to be overhauled, and a large-area power failure accident is easily caused.
The clamp and the live working method comprise the following steps:
1. the cleaning brush is used for cleaning the rotating arm 8 of the static contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link in advance to a small extent, so that oxide layers on the rotating arm 8 of the static contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link are removed, and the conductivity is improved.
2. Two live working electricians on the ground connect the conductive column 6 and the conductive clip 5 tightly in advance, after ensuring good contact, adopt two insulating operating rods to install the leveling part 11, fix the shunt clamp on the leveling part 11, and then lift the shunt clamp at a position about 1 m away from the disconnecting link to the same height as or higher than the rotating arm 8 of the static contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link, and then translate the shunt clamp to the rotating arm 8 of the static contact of the disconnecting link and the rotating arm 9 of the moving contact of the disconnecting link, so that the shunt clamp cannot be directly lifted and installed at the installing position of the disconnecting link, and the serious accident of short circuit is easily caused.
3. Two insulating operating rods for installing a shunt clamp are respectively and synchronously controlled by two live working personnel, the two insulating operating rods are kept parallel and vertical as much as possible, the situation that a conducting post 6 and a conducting clamp 5 of the clamp are displaced and loosened to cause insufficient contact surface and reduce the through-current performance is avoided, then a first installation part 1 and a second installation part 2 are respectively hooked on a disconnecting link static contact rotating arm 8 and a disconnecting link moving contact rotating arm 9 which are cleaned of an oxide layer, the positions of the conducting post 6 and the conducting clamp 5 are coincided with the dividing point of a disconnecting link moving contact and a disconnecting link static contact, the situation that the conducting post and the conducting clamp are not on the same horizontal line is not obtained, another live working worker alternately locks an adjusting screw rod 3, in the locking process, the conducting post 6 and the conducting clamp 5 are sequentially and alternately locked, and the situation that the conducting post 6 and the conducting clamp 5 are displaced to cause poor contact due to stress and great disparity on the two sides is avoided.
4. After the two ends of the conductive column 6 and the conductive clamp 5 of the shunt clamp are locked, the insulating operating rod of the adjusting screw rod 3 is firstly removed, and then the edge operating rod corresponding to the conductive column 6 and the conductive clamp 5 is removed.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (9)
1. The utility model provides a transformer disconnecting link contact generates heat and handles reposition of redundant personnel anchor clamps with electricity, includes electrically conductive material's first installation department (1) and second installation department (2), its characterized in that: all be provided with fixture on first installation department (1) and second installation department (2), install respectively on isolator static contact rocking arm (8), isolator moving contact rocking arm (9) through fixture with first installation department (1) or second installation department (2) that correspond, be provided with respectively on first installation department (1) and second installation department (2) and electrically conduct clamp (5) and lead electrical pillar (6), electrically conduct clamp (5) and lead electrical connection cooperation of electrical pillar (6), electrically conduct clamp (5) one side and be provided with the opening that supplies to lead electrical pillar (6) business turn over, it follows transformer isolator moving contact and the business turn over of opening and shutting of transformer isolator static contact to lead electrical pillar (6) the opening of electrically conducting clamp (5).
2. The shunt clamp for the heating and electrification processing of the contact of the power transformation disconnecting link as claimed in claim 1, wherein: the conductive clip (5) is of a U-shaped structure made of elastic materials.
3. The shunt clamp for the heating and electrification processing of the contact of the power transformation disconnecting link according to claim 2, wherein: two ends of the conductive clip (5) with the U-shaped structure are bent outwards.
4. The shunt clamp for the heating and electrification processing of the contact of the power transformation disconnecting link as claimed in claim 1, wherein: fixture including fixed electrically conductive locking claw (7) that sets up on corresponding first installation department (1) or second installation department (2) upper portion, with adjusting screw (3) that correspond first installation department (1) or second installation department (2) threaded connection, adjusting screw (3) one end is connected with movable locking claw (4), and is rotatory adjusting screw (3) drive movable locking claw (4) are close to or keep away from corresponding electrically conductive locking claw (7).
5. The power transformation switch contact heating live-wire processing shunt clamp as claimed in claim 4, wherein: lead electrical pillar (6) including fixed part (61) and movable part (62), be provided with the elastic component between fixed part (61) and the movable part (62), movable part (62) compress tightly on fixed part (61) through the threaded rod.
6. The shunt clamp for the heating and electrification processing of the contact of the power transformation disconnecting link according to claim 4, wherein: the disconnecting link moving contact positioning device is characterized in that a positioning part (10) made of insulating materials is detachably mounted on the first mounting part (1) or the second mounting part (2), and the shape of the positioning part (10) is matched with the interval between a disconnecting link static contact rotating arm (8) and a disconnecting link moving contact rotating arm (9).
7. The shunt clamp for the heating and electrification processing of the contact of the power transformation disconnecting link as claimed in claim 6, wherein: be provided with holder (101) on location portion (10), be provided with guide (102) on holder (101), guide way (22) have been seted up on first installation department (1) or second installation department (2), guide (102) and guide way (22) sliding fit, be provided with rings (103) on holder (101).
8. The power transformation switch contact heating live-wire processing shunt clamp as claimed in claim 4, wherein: all seted up draw-in groove (21) on first installation department (1) and second installation department (2), be provided with diaphragm (111) of laminating with first installation department (1), second installation department (2) simultaneously, be provided with at least two sets of card post (114) on diaphragm (111), card post (114) are from up inserting in can dismantling joint complex draw-in groove (21), install retaining member (112) on diaphragm (111), retaining member (112) are used for pressing from both sides the tight action bars of fixing in the outside.
9. The shunt clamp for the heating and electrification processing of the contact of the power transformation disconnecting link according to claim 8, wherein: the clamping column (114) is provided with an elastic piece (115), and the elastic piece (115) is elastically abutted against the inner side wall of the corresponding clamping groove (21) through elastic force of the elastic piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222144552.2U CN217881280U (en) | 2022-08-15 | 2022-08-15 | Shunt clamp for heating and live-line processing of transformer disconnecting link contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222144552.2U CN217881280U (en) | 2022-08-15 | 2022-08-15 | Shunt clamp for heating and live-line processing of transformer disconnecting link contact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217881280U true CN217881280U (en) | 2022-11-22 |
Family
ID=84076534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222144552.2U Active CN217881280U (en) | 2022-08-15 | 2022-08-15 | Shunt clamp for heating and live-line processing of transformer disconnecting link contact |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217881280U (en) |
-
2022
- 2022-08-15 CN CN202222144552.2U patent/CN217881280U/en active Active
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