CN218415198U - Door contact switch and socket thereof - Google Patents
Door contact switch and socket thereof Download PDFInfo
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- CN218415198U CN218415198U CN202121041156.6U CN202121041156U CN218415198U CN 218415198 U CN218415198 U CN 218415198U CN 202121041156 U CN202121041156 U CN 202121041156U CN 218415198 U CN218415198 U CN 218415198U
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- external lead
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Abstract
The utility model discloses a door contact switch and socket thereof. The socket of the door contact switch comprises a shell, a conducting strip arranged in the shell and a connecting piece arranged in the shell and used for connecting an external lead, wherein one end part of the conducting strip is provided with a contact used for being contacted and conducted with a plug of the door contact switch, the other end part of the conducting strip is electrically connected with the connecting piece, the connecting piece comprises a body and at least two wire clamping pieces, the body is arranged on the shell or the conducting strip and is conducted with the conducting strip, the wire clamping pieces extend along the threading direction from the body and are provided with a leading-in end connected with the body and a clamping end away from the body by a certain distance, the socket is provided with an initial or maintenance state without being connected with the external lead, the distance between the clamping ends of the wire clamping pieces is smaller than the outer diameter of the external lead in the initial or maintenance state, and the wire clamping pieces are provided with elasticity so as to allow the external lead to pass through the clamping ends. The utility model discloses the convenient and reliable just contact failure's of wiring risk is less.
Description
Technical Field
The utility model belongs to door contact switch field relates to a door contact switch and socket, especially a door contact switch and socket of lift-cabin door.
Background
The elevator safety door contact switch is mainly used for controlling the closing and opening of an elevator car door and an elevator landing door, and protecting the safety of elevator passengers and the normal operation of an elevator. The door contact switch among the prior art adopts the wiring mode of screw-up mostly, need just can accomplish the connection of wire and door contact switch with the help of specialized tool, and the installation is complicated, and is influenced by operating personnel's skill level, easily causes contact failure scheduling problem, still needs regular maintenance.
For example, chinese patent document CN206976189U discloses an elevator door switch commonly used at present, which includes a plug and a socket that can be inserted into each other, two insertion rods are integrally formed and protrudingly provided in the middle of the plug, a jack adapted to the insertion rods is provided in the middle of the upper side of the socket, two V-shaped reeds are respectively arranged in the socket in bilateral symmetry, two fixing posts are respectively integrally provided in the socket in bilateral symmetry, the bending portions of the two V-shaped reeds are respectively sleeved on the two fixing posts correspondingly, silver contacts are respectively provided at one ends of the two V-shaped reeds close to the jack, the insertion rods are respectively inserted into the socket along the jack and abut against the silver contacts, two connection screws are respectively integrally provided in the socket in bilateral symmetry, and the other ends of the two V-shaped reeds are respectively connected to the two connection screws correspondingly. The elevator door switch has the problems of complex installation and large risk of poor contact.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a door contact switch and socket thereof, its wiring is convenient reliable and contact failure's risk is less.
According to the utility model discloses an aspect, a socket of door contact switch, include the casing, locate conducting strip in the casing and locate be used for inserting external conductor's connecting piece in the casing, be equipped with on a tip of conducting strip be used for with the plug of door contact switch contacts the contact that switches on, another tip of conducting strip with connecting piece electric connection, the connecting piece includes body and two at least trapping mechanism, the body is located the casing or on the conducting strip and with the conducting strip switches on mutually, trapping mechanism certainly the body extend along the threading direction and have with the leading-in end that the body links to each other and apart from the exposed core of one section distance of body, the socket has not pegging into the initial or maintenance state of external conductor during initial or maintenance state, at least two trapping mechanism the distance between the exposed core is less than external conductor's external diameter, trapping mechanism has elasticity and can allow external conductor certainly pass between the exposed core.
In some preferred embodiments, the distance between the lead-in ends of at least two of the wire clamps is greater than the distance between the clamping ends.
In some more preferred embodiments, at least one of the wire clamps extends obliquely from the lead-in end to the clamping end in a manner of gradually approaching a center line, and the center line can be coincident with the center line of the accessed external lead.
Furthermore, the space enclosed by the wire clamping piece is conical as a whole.
In some preferred embodiments, the body is formed with a threading hole for the external lead to pass between the thread clamping members.
In some preferred embodiments, the connecting member is integrally formed of metal.
In some preferred embodiments, the number of the conductive sheets is two and the mirror images are symmetrical, and the number of the connectors is two and the mirror images are symmetrical.
In some preferred embodiments, the body is connected to the other end portion of the conductive sheet by a rivet.
In some preferred embodiments, the socket further comprises a release member capable of being inserted between the clamping members to spread the clamping ends apart to release the external lead.
In some more preferred embodiments, the housing includes a body having a pressing through hole and a tongue piece located in the pressing through hole and allowing pressing, a part of the tongue piece is connected to the body, the releasing member is located on an inner surface of the tongue piece, the releasing member extends inward from the inner surface of the housing along a releasing direction, the tongue piece has elasticity and can be pressed toward the wire clamping member so that the releasing member is inserted between the wire clamping members, and an included angle between the releasing direction and the threading direction is greater than 45 degrees and smaller than 135 degrees. The tongue piece is pressed down, the release piece on the inner surface of the tongue piece moves inwards, the release piece is inserted between the wire clamping pieces, the clamping ends of the wire clamping pieces are propped open, the external lead between the clamping ends is released and can be pulled out of the socket, the external lead can be conveniently replaced or maintained, auxiliary tools are not needed, the working time is saved, and the efficiency is improved.
Furthermore, the tongue piece is provided with a pressing part positioned in the pressing through hole and a connecting end connected with the hole wall of the pressing through hole, and a gap is formed between the pressing part and the hole wall of the pressing through hole.
Further, the pressing portion is recessed inward compared to other portions of the housing.
Optionally, the whole body is strip-shaped or U-shaped, and only one end or one side of the whole body is connected with the hole wall of the pressing through hole.
Further, the release member is a projection formed on an inner surface of the tongue.
In some specific and preferred embodiments, the connector further comprises a disconnecting guide provided at the clamping end of the clamping member and/or at a portion adjacent to the clamping end, the disconnecting guide having a guide slope guiding the release member to be inserted between the clamping members.
More preferably, the release member has a contact slope cooperating with the guide slope.
According to another aspect of the present invention, a door contact switch includes a socket and a plug, = the socket is the socket as described above.
The utility model adopts the above scheme, compare prior art and have following advantage:
the door contact switch and the plug thereof push the external lead into the wiring through hole of the connecting piece, the external lead overcomes the elastic force of the wire clamping piece and passes through between the clamping ends, and is clamped by the clamping ends under the action of the elastic reset force of the clamping piece, the wiring can be automatically compressed, the firm mechanical connection and the electric connection are realized, the wiring is simple and convenient, the poor contact is avoided, and the frequent maintenance is not needed; and in the wiring process, other tools are not needed for assistance (for example, a screw fastening tool is not needed), and the installation is convenient.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a door contact switch according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a socket according to an embodiment of the present invention, wherein the upper case is not shown.
Fig. 3 is a top view of a receptacle according to an embodiment of the present invention, wherein the upper shell is not shown.
Fig. 4 is a schematic structural view of two conductive sheets in fig. 1.
Fig. 5 is a partially enlarged view of a point a in fig. 4.
Figure 6 is a side view of the conductive sheet of figure.
Fig. 7 is a schematic structural diagram of an upper shell of a socket according to an embodiment of the present invention;
FIG. 8 is a schematic view of the inner surface of the upper shell of FIG. 7;
fig. 9 is a schematic diagram of a side of a receptacle according to an embodiment of the invention.
Fig. 10 is a schematic view of the left side jack of fig. 9.
Wherein:
100-a socket;
1-a shell; 11-a lower shell; 111-jack; 111 a-flaring portion; 111 b-a transition; 111 c-geometric center; 112-wiring vias; 12-upper shell; 120-pressing the through hole; 121-tongue piece; 122-buckling;
2-a conductive sheet; 21-a contact;
3-a connector; 31-a body; 31 a-a threading hole; 32-a wire clamp; 321-a lead-in end; 322-a clamping end; 323-a guide block for removing stitches; 324-space; 33-rivets;
4-a release;
200-plug; 201-inserting rod.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.
According to an embodiment of the utility model, provide a door contact switch's socket and have door contact switch of this kind of socket, this door contact switch specifically is elevator door contact switch. Referring to fig. 1, the door contact switch includes a socket 100 and a header 200 that are pluggable into each other. The plug 200 has two insertion rods 201, and the socket 100 is provided with two insertion holes 111 mutually matched with the insertion rods 201, and the insertion rods 201 can be inserted into the corresponding insertion holes 111.
Referring to fig. 2 to 9, the socket 100 includes a housing 1, a conductive plate 2 disposed in the housing 1, and a connector 3 disposed in the housing 1 for connecting an external wire (which is not a component of the door contact switch and is connected to the socket only after being mounted on the elevator door, and thus is not shown). One end of the conductive plate 2 is provided with a contact 21 for contacting and conducting with the insertion rod 201 of the plug 200, and the other end of the conductive plate 2 is electrically connected with the connector 3. The conductive sheet 2 is a spring made of conductive material, such as metal or alloy, and is bent and processed to have elasticity. The number of the conductive plates 2 is two and symmetrically arranged to correspond to the two insertion rods 201 of the plug 200. The contact 21 may be a conductive bump disposed on one end of the conductive plate 2, and when the insertion rod 201 is inserted, the end of the insertion rod 201 and the contact 21 are in tight contact with each other, so as to be conducted with each other. The connecting piece 3 is used for realizing mechanical connection and electrical connection with an external lead, and transmitting an electric signal through the external lead (such as a signal wire), for example, transmitting the electric signal to a control system of an elevator door; when the insertion rod 201 of the plug 200 is inserted into the socket 100 and abuts against the contact 21, an electrical signal is generated by triggering, and the electrical signal is transmitted to the control system through an external wire, so that the opening of the elevator door can be controlled.
In this embodiment, the connecting member 3 is disposed on the other end of the conductive plate 2, and the two are electrically connected. The connecting member 3 is integrally formed of a conductive material, for example, a metal sheet or an alloy sheet by punching, cutting, or the like. Specifically, as shown in fig. 5, the connecting member 3 includes a body 31 and at least two wire clamping members 32. The body 31 is arranged on the conducting plate 2 and communicated with the conducting plate 2, and the body 31 is connected to the conducting plate 2 through a rivet 33; the body 31 is formed with a threading hole 31a for the external lead to pass through between the thread clamping members 32, and a central line C of the threading hole 31a is a threading direction of the external lead. The threading hole 31a is formed by bending a metal sheet into a C shape, i.e. the wall of the hole surrounding the threading hole 31a is not completely closed but has a small gap. The number of the wire clamps 32 is two or three or four or more, and a space 324 for accommodating the external lead is defined between the wire clamps 32. The thread clamping member 32 extends from the body 31 in the threading direction and has a lead-in end 321 connected to the body 31 and a clamping end 322 spaced from the body 31. The socket 100 has an initial or maintenance state without accessing the external wires, in the initial or maintenance state, the distance between the clamping ends 322 of at least two wire clamping members 32 is smaller than the outer diameter of the external wires, and the wire clamping members 32 have elasticity to allow the external wires to pass through between the clamping ends 322. During wiring, the clamping end 322 is spread; after the external conductor penetrates, the external conductor is clamped between the clamping ends 322, so that the external conductor is effectively prevented from loosening, and the risk of poor contact is reduced.
The distance between the leading-in ends 321 of the thread clamping pieces 32 is greater than the distance between the clamping ends 322, at least one thread clamping piece 32 extends obliquely from the leading-in end 321 to the clamping end 322 in a manner of gradually approaching to the center line C of the threading hole 31a, and the center line C of the threading hole 31a can be overlapped with the center line of the accessed external lead. Thus, the space 324 surrounded by the wire clamping members 32 is entirely pyramid-shaped or conical. Specifically, each of the thread clamping members 32 extends obliquely from the lead-in end 321 to the holding end 322 so as to gradually approach the center line C of the threading hole 31a, and a space 324 in the shape of a regular pyramid with a gradually decreasing cross-sectional area is defined between the thread clamping members 32. The wire clamping member 32 is disposed obliquely to guide the external wire to pass through, so that the external wire can approach and enter the clamping end 322.
The socket 100 further comprises a releasing member 4 which can be inserted between the wire clamping members 32 to expand the clamping ends 322 to release the external wires; when the wiring is wrong or the external lead needs to be maintained and replaced, the clamping end 322 of the wire clamping piece is opened by operating the releasing piece 4, and the external lead is pulled out to be separated from the connecting piece 3. Further, the release member 4 is movably arranged on the housing 1 along a release direction, an included angle between the release direction and the threading direction is greater than 0 and smaller than 180 degrees, the included angle is preferably greater than 45 degrees and smaller than 135 degrees, and further greater than 60 degrees and smaller than 120 degrees; in particular, in this embodiment, the release direction and the threading direction are spatially perpendicular to each other.
The casing 1 mainly comprises an upper casing 12 and a lower casing 11, wherein the upper casing 12 is provided with a plurality of buckles 122, and the upper casing 12 and the lower casing are mutually clamped through the buckles 122. A space in which the conductive sheet 2 and the connector 3 are arranged is formed in the lower case 11, and the upper case 12 covers the lower case 11 to close the space. The conductive plate 2 and the connecting member 3 are located between the upper case 12 and the lower case 11. The upper shell 12 comprises a body 31 provided with a pressing through hole 120 and a tongue piece 121 positioned in the pressing through hole 120 and used for pressing, wherein part of the tongue piece 121 is connected with the body 31, and a weak part capable of being elastically deformed is formed at the joint of the tongue piece 121 and the body 31. The release member 4 is disposed on the inner surface of the tongue 121 and extends downward in the release direction. The release element 4 is embodied as a protrusion formed on the inner surface of the tongue 121, which is shaped like a wedge or a trapezoid from a bottom or top view, fitting into the space enclosed by the wire clamping element 32. Further, the upper case 12 is integrally injection molded from an insulating material such as plastic, the tongue piece 121 has a pressing portion located in the pressing through hole 120 and a connecting end connected to a hole wall of the pressing through hole 120, and a gap is provided between the pressing portion and the hole wall of the pressing through hole 120. The tongue piece is strip-shaped or U-shaped as a whole, and only one end or one side is connected with the hole wall of the pressing through hole 120. The pressing portion is recessed inward compared to other portions of the upper shell 12. The tongue piece 121 has elasticity, and the releasing piece 4 can be pushed into the space between the wire clamping pieces 32 by pressing the pressing part inwards to open the clamping end 322, so that the external lead can be conveniently maintained or replaced.
Each of the wire clamps 32 further includes a wire-removal guide 323, respectively, the wire-removal guide 323 being located at the clamping end 322 of the wire clamp 32 and/or adjacent to the clamping end 322. The disconnecting guide 323 has a guide slope guiding the release member 4 to be inserted between the clamping members 32, and accordingly, the release member 4 has a contact slope cooperating with the guide slope. As shown in fig. 5, the two stitch removing guide blocks 323 of the two stitch clamping members 32 are disposed opposite to each other, and the guide slopes of the two stitch removing guide blocks are opposite to each other, so as to form a V-shaped or inverted trapezoidal guide space therebetween, so as to guide the releasing member 4, and facilitate the releasing member 4 to enter between the stitch removing guide blocks 323 to open the clamping end 322.
The door contact switch is provided with two conducting strips 2, and two contacts 21 are arranged on the two conducting strips 2; correspondingly, the number of the jacks 111 is two, and the jacks correspond to the number and the positions of the contacts 21 one by one; the number of the connecting pieces 3 is two, the number of the through holes and the tongues 121 of the upper shell 12 is two, and the number of the releasing pieces 4 is two, and the number and the positions of the two connecting pieces 3 correspond to one another.
The above-mentioned insertion hole 111 is specifically opened on the side surface of the lower case 11, and the plug 200 is inserted to approach and contact with the contact 21 on the conductive sheet 2. The two receptacles 111 are identical in shape and mirror-symmetrical with respect to the Y-Y direction in fig. 9. The shape of the insertion hole 111 will be described in detail by taking the insertion hole 111 on the left side in fig. 9 as an example.
Referring to fig. 10, the insertion hole 111 has a geometric center 111c and is a shaped hole with a contour having a plurality of outwardly convex flaring portions 111a; specifically, the flaring portion 111a protrudes outward relative to a regular reference pattern (e.g., a circle as shown by a dotted line in fig. 10) centered on the geometric center 111c, and is located outside the regular pattern. Adjacent flared portions 111a are connected by a transition portion 111b, the transition portion 111b is a straight line or an arc line that is convex outward, and the distance between the flared portion 111a and the geometric center 111c is greater than the distance between the transition portion 111b and the geometric center 111 c. The transition 111b may be located within or partially coincident with or outside of the reference figures described above, but is less convex than the flared portion 111a, i.e., the transition 111b has a curvature less than the curvature of the flared portion 111 a.
Further, the flaring portion 111a is formed of an arc and has a curvature larger than that of the connecting portion. The contour of the receptacle 111 is centrosymmetric with respect to its geometric center 111 c.
Specifically, in the present embodiment, the number of the flaring portions 111a is two and the flaring portions 111a are arranged oppositely, and the two flaring portions 111a are connected by two outward-convex arcs and enclose a closed contour, which is an axisymmetric figure. Each flared portion 111a spans the X-X direction and is mirror symmetric with respect to the X-X direction. This shape of the receptacle 111 increases the plug-in fit space of the contact bridge and ensures correct insertion. It should be noted that the line connecting the geometric centers of the two insertion holes 111 extends in the X-X direction, and the line connecting the center lines of the two insertion rods 201 of the plug 200 extends in the X-X direction.
In another embodiment, the number of the flaring portions 111a is four and the flaring portions 111a are arranged opposite to each other in pairs, wherein one pair of the flaring portions 111a spans the X-X direction and the other pair of the flaring portions 111a spans the Y-Y direction.
The shell 1 is provided with wiring through holes 112 for inserting external wires and reaching the connecting pieces 3, and the number and the positions of the wiring through holes 112 correspond to those of the two connecting pieces 3 one by one. The wiring insertion hole 111 is preferably opened on the other side surface of the housing 1 opposite to the insertion hole 111, specifically, on the side surface of the lower case 11. The threading through holes 112 are aligned with and communicate with the threading holes 31a of the connector 3.
The wiring process of the door contact switch of the present embodiment is as follows:
a pair of external conductors are respectively inserted into the two wiring through holes 112, sequentially pass through the wiring through holes 112 and the threading holes 31a, then under the guidance of the wire clamping piece 32, overcome the elastic force of the wire clamping piece and pass through the clamping ends 322, and are clamped by the clamping ends 322, so that the wiring can be automatically compressed, the stable mechanical connection and the electric connection are realized, the wiring is simple and convenient, the poor contact is avoided, and the frequent maintenance is not needed. And no other tool is needed for assistance in the wiring process (for example, no screw fastening tool is needed), and the installation is convenient.
The wiring process of the door contact switch of the present embodiment is as follows:
the tongue piece 121 is pressed down, the release part 4 on the inner surface of the tongue piece 121 moves inwards and is in contact with the wire removing guide block 323 of the wire clamping piece 32, under the guiding action of the release part 4, the release part 4 is inserted between the wire clamping pieces 32, the clamping end 322 of the wire clamping piece 32 is propped open, the external lead between the clamping ends 322 is released and can be pulled out of the socket 100, the external lead can be conveniently replaced or maintained, auxiliary tools are not needed, the working time is saved, and the efficiency is improved.
The working principle of the door contact switch of the embodiment is as follows:
when the elevator door reaches a preset height, the two insertion rods 201 of the plug 200 are inserted into the insertion holes 111 of the socket 100, the top ends of the insertion rods 201 are abutted against the contacts 21 of the two conducting strips 2, the conducting strips 2 are conducted to generate an electric signal, and the electric signal is transmitted to a control system of the elevator door through an external wire connected with the conducting strips 2 through the connecting piece 3, so that the opening and closing of the elevator door are controlled. The insertion hole 111 of the present embodiment adopts a special shape having a plurality of outward-expanding portions 111a, which increases the fitting space when the insertion rod 201 is inserted, and can ensure that the insertion rod 201 is correctly inserted and is in contact with the contact 21, thereby having higher reliability.
As used in this specification and the appended claims, the terms "comprises" and "comprising" are intended to only encompass the explicitly identified steps and elements, which do not constitute an exclusive list, and that a method or apparatus may include other steps or elements. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the description of the upper, lower, left, right, etc. used in the present invention is only relative to the mutual positional relationship of the components of the present invention in the drawings.
It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous.
While the principles and specific embodiments of this invention have been described above, those skilled in the art, having the benefit of the teachings of this invention, will appreciate numerous modifications and variations there from, falling within the scope of the invention. It will be appreciated by persons skilled in the art that the foregoing detailed description is provided for the purpose of illustrating the invention and is not to be construed as limiting the invention. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a socket of door contact switch, includes the casing, locates conducting strip in the casing and locating be used for in the casing insert external conductor's connecting piece, be equipped with on a tip of conducting strip be used for with the contact that the plug of door contact switch contacted and switched on, another tip of conducting strip with connecting piece electric connection, its characterized in that: the connecting piece comprises a body and at least two wire clamping pieces, the body is arranged on the shell or the conductive sheet and is communicated with the conductive sheet, the wire clamping pieces extend from the body along the threading direction and are provided with a guide end connected with the body and a clamping end away from the body by a distance, the socket is provided with an initial or maintenance state without being connected with the external lead, in the initial or maintenance state, the distance between the clamping ends of at least two wire clamping pieces is smaller than the outer diameter of the external lead, and the wire clamping pieces have elasticity and can allow the external lead to pass through the clamping ends.
2. The receptacle of claim 1, wherein: the distance between the leading-in ends of at least two wire clamping pieces is larger than the distance between the clamping ends.
3. The receptacle of claim 2, wherein: at least one of the wire clamping pieces obliquely extends from the leading-in end to the clamping end in a mode of gradually approaching a central line, and the central line can be overlapped with the central line of the accessed external lead.
4. The receptacle of claim 2, wherein: in the initial or maintenance state, a conical space is defined between the wire clamping pieces.
5. The receptacle of claim 1, wherein: the body is provided with a threading hole for the external lead to pass through between the thread clamping pieces.
6. The receptacle of claim 1, wherein: the connecting member is integrally formed of metal.
7. The receptacle of claim 1, wherein: the number of the conducting strips is two and is in mirror symmetry, and the number of the connecting pieces is two and is in mirror symmetry.
8. The receptacle of claim 1, wherein: the body is connected to the other end of the conductive sheet by a rivet.
9. The receptacle of claim 1, wherein: and the shell is provided with a wiring through hole for an external lead to be inserted into and reach the connecting piece.
10. A door contact switch comprising a socket and a plug, wherein the socket is as claimed in any one of claims 1 to 9.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202121041156.6U CN218415198U (en) | 2021-05-14 | 2021-05-14 | Door contact switch and socket thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202121041156.6U CN218415198U (en) | 2021-05-14 | 2021-05-14 | Door contact switch and socket thereof |
Publications (1)
Publication Number | Publication Date |
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CN218415198U true CN218415198U (en) | 2023-01-31 |
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ID=84997161
Family Applications (1)
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CN202121041156.6U Active CN218415198U (en) | 2021-05-14 | 2021-05-14 | Door contact switch and socket thereof |
Country Status (1)
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CN (1) | CN218415198U (en) |
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2021
- 2021-05-14 CN CN202121041156.6U patent/CN218415198U/en active Active
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