CN211169385U - Pit maintenance device of high-speed ladder - Google Patents
Pit maintenance device of high-speed ladder Download PDFInfo
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- CN211169385U CN211169385U CN201922083581.0U CN201922083581U CN211169385U CN 211169385 U CN211169385 U CN 211169385U CN 201922083581 U CN201922083581 U CN 201922083581U CN 211169385 U CN211169385 U CN 211169385U
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Abstract
The utility model relates to a pit of high-speed ladder overhauls device, by the bearing crossbeam that is fixed in the well bottom, vertically put two guide rails at bearing crossbeam both ends respectively side by side to and the staple bolt of fixed connection between two guide rails constitutes stable structure, and fix the pit department at the high-speed ladder. Through a plurality of hangers that set up on the staple bolt, can hang the maintenance cat ladder on the staple bolt through the hanger to through hanging the maintenance cat ladder on the hanger of different positions, thereby change the position of maintenance cat ladder in the pit, make maintainer accessible cat ladder overhaul the maintenance point to car bottom different positions. And still fixedly connected with top wants the buffer that extends on bearing beam bottom, the car that makes on being in the maintenance device, when the emergence problem falls downwards, can have the buffer to provide the protection for the speed reduction personnel. The pit overhauling device of the high-speed ladder is simple and compact in structure, and can form standardized parts for production, so that the production efficiency is improved, and the installation is attractive.
Description
Technical Field
The utility model relates to an elevator equipment especially relates to a pit of high-speed ladder overhauls device.
Background
The elevator components usually installed in the elevator pit are the tension wheel part of the elevator guide rail, the buffer, the compensating rope tension device and the speed limiter, and meanwhile, after the elevator car bottom is leveled at the bottom layer, the safety tongs, the guide shoes, the super full load device and the like close to the elevator car bottom are required to be overhauled and checked in the pit. In general, as the tensioning devices of the compensating rope and the tensioning wheel of the speed limiter are close to the plane of the pit, the maintenance and the operation are not difficult; the adjustment of the guide rail, the maintenance of the buffer action switch, the maintenance adjustment of the wedge block of the car bottom safety tongs, the inspection of the abrasion condition of the guide shoe liner, the inspection of the over-full switch state of the car bottom and the like, because the pit depth of the high-speed elevator is usually deep and is about 3.5-4 meters according to the pit depth of the high-speed elevator of 4m/s, people can not reach the components when standing at the pit ground, and the ascending operation is needed.
The general solution is: the maintenance platform is arranged at a certain height of the pit, and the maintenance platform can not be contacted by elevator parts such as a car bottom foot guard, a safety gear, a guide shoe and a buffer under the condition that the buffer is compressed at the bottom of an elevator car, and climbs the maintenance platform by a ladder on the side to maintain and maintain the relevant parts in the elevator pit. Because the elevator well of different specifications need dispose the elevator of equidimension not and lead to the specification of elevator different, under this condition, the maintenance platform of small dimension's setting often is more difficult, and the width of the maintenance platform of small dimension is too narrow moreover, and its maintenance platform of minimum elevator specification often is not enough to stand the people's foot even, can't satisfy the requirement of the minimum width 500mm who overhauls the platform far away. Since the maintenance platform is provided, the safety guardrails need to be arranged around the maintenance platform to prevent falling, the guardrails also need to be arranged into a movable type for a manufacturing plant, and the guardrails can be folded in a state of not being maintained, so that the design of the maintenance platform is more complicated and difficult, the actual situation is that a manufacturer often sends bulk materials such as angle steel and the like to a construction site, and the bulk materials are automatically welded and spliced by an installation worker site according to the site situation, so that the manufactured east-west-five-door and eight-door have various characteristics and are difficult to meet the standard requirements of safety and attractiveness.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a pit inspection apparatus for a high-speed ladder.
A pit inspection apparatus of a high-speed ladder, the pit inspection apparatus comprising:
the bearing cross beam is fixed at the bottom of the well;
the two height adjusting seats are respectively arranged at two ends of the bearing cross beam;
the two guide rails are arranged vertically side by side, and the bottom ends of the two guide rails are respectively fixed on the corresponding height adjusting seat;
the hoop is fixedly connected between the two guide rails and is positioned in the middle of the two guide rails in the height direction;
the bottom of the buffer is fixed on the bearing cross beam, the top of the buffer extends upwards, and the buffer and the hoop are fixed with each other through a connecting piece;
the plurality of hanging lugs are fixedly arranged on the hoop along the transverse direction;
the overhaul crawling ladder is hung on the corresponding hanging lug in position.
Optionally, each of the height adjusting bases includes:
the bottom plate is fixed on the top surface of the bearing cross beam;
a backup plate which is bent upwards from one side of the bottom plate, and one side of the bottom of the guide rail can be clamped and fixed on the backup plate in a sliding way,
the base plate is positioned above the bottom plate, and the lower end of the guide rail is abutted against the top surface of the base plate;
the adjusting screw rod penetrates through the bottom plate and abuts against the bottom surface of the base plate, and is used for adjusting the height of the guide rail through the base plate;
and the locking nuts are in threaded fit with the adjusting screw rods, and the locking nuts on the same adjusting screw rod are arranged in pairs and clamped on the upper side and the lower side of the bottom plate.
Optionally, the backup plate is connected with first pressing plates in pairs, the same pair of first pressing plates respectively clamp two opposite sides of the guide rail, and the guide rail is allowed to adjust the height when the first pressing plates are in a loose state.
Optionally, the hoop includes:
a cross portion, wherein the bearing beams are arranged in parallel, the buffer and the plurality of hangers are connected to the cross portion,
and the connecting parts are respectively fixed at two ends of the transverse part and are fixedly connected with the guide rail on the corresponding side.
Optionally, the connecting portion is connected with second pressing plates in pairs, and the same pair of second pressing plates respectively clamp two opposite sides of the guide rail.
Optionally, the number of the buffers is two, the buffers are arranged side by side, each buffer is provided with a fixing plate, and the fixing plates are connected with the transverse portion of the hoop through fixing seats.
Optionally, the overhaul ladder stand is provided with at least two hanging holes matched with the hanging lugs.
The pit overhauling device of the high-speed ladder is characterized in that the pit overhauling device is composed of a bearing cross beam fixed at the bottom of a hoistway, two guide rails respectively vertically arranged at two ends of the bearing cross beam side by side and a hoop fixedly connected between the two guide rails, and the bearing cross beam is fixed at the pit of the high-speed ladder. Through a plurality of hangers that set up on the staple bolt, can hang the maintenance cat ladder on the staple bolt through the hanger to through hanging the maintenance cat ladder on the hanger of different positions, thereby change the position of maintenance cat ladder in the pit, make maintainer accessible cat ladder overhaul the maintenance point to car bottom different positions. And still fixedly connected with top wants the buffer that extends on bearing beam bottom, the car that makes on being in the maintenance device, when the emergence problem falls downwards, can have the buffer to provide the protection for the speed reduction personnel. The pit overhauling device of the high-speed ladder is simple and compact in structure, and can form standardized parts for production, so that the production efficiency is improved, and the installation is attractive.
Drawings
FIG. 1 is a schematic structural diagram of an elevator pit inspection device in one embodiment;
FIG. 2 is a schematic view of a height adjustment seat according to one embodiment;
FIG. 3 is a schematic structural diagram of a hanging part of the overhauling crawling ladder in one embodiment;
description of the figure numbering:
1. a load-bearing beam; 11. a fixed part;
2. a height adjusting seat; 21. a base plate; 22. a backup plate; 23. a base plate; 24. adjusting the screw rod; 25. locking the nut; 26. a first platen;
3. a guide rail;
4. hooping; 41. a transverse part; 42. a connecting portion; 43. a second platen;
5. a buffer; 51. a fixing plate; 52. a fixed seat; 53. a buffer base;
6. hanging a lug;
7. overhauling the crawling ladder; 71. hanging holes; 72. hanging the plate; 73. a protruding rod;
8. a safety switch.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
As shown in fig. 1, there is provided a pit inspection apparatus of a high-speed ladder, the pit inspection apparatus including: and the bearing cross beam 1 is fixed at the bottom of the well. Two height adjusting seats 2 are respectively arranged at two ends of the bearing beam 1. The two guide rails 3 are arranged side by side and the bottom ends of the two guide rails are respectively fixed on the corresponding height adjusting seat 2. And the hoop 4 is fixedly connected between the two guide rails 3 and is positioned in the middle of the two guide rails 3 in the height direction. The bottom of the buffer 5 is fixed on the bearing cross beam 1, the top of the buffer extends upwards, and the buffer 5 and the hoop 4 are fixed with each other through a connecting piece. And the hanging lugs 6 are fixedly arranged on the hoop 4 along the transverse direction. And the maintenance ladder stand 7 is hung on the corresponding hanging lug 6.
Generally when overhauing the car bottom of high-speed ladder, because the pit of high-speed ladder is darker, need set up the maintenance platform in the pit, the maintainer need ascend a height the operation, and the maintenance platform sets up at a fixed height, therefore the maintenance point of a bit of height is difficult for overhauing.
In this embodiment, through set up the stable frame body that is formed by bearing beam 1, two guide rails 3, staple bolt 4 and 5 interconnects of buffer in the pit of high-speed ladder to a plurality of hangers 6 of arranging along horizontal fixed on staple bolt 4, so that overhaul cat ladder 7 accessible hangs on the hangers 6 of different positions, make the maintainer can overhaul the maintenance point to the different positions in car bottom, and overhaul the maintenance point of co-altitude through overhaul cat ladder 7. Through this pit overhauls device, the maintainer can overhaul the car bottom in the position along 4 length direction of staple bolt and the scope of overhauing 7 heights of cat ladder. And the pit overhauling device has a simple structure and is fast and convenient to install. Each part can be produced in a standardized way, and the production efficiency is improved and the installation is attractive.
In this embodiment, a plurality of pairs of fixing portions 11 are disposed at the bottom of the load-bearing beam 1, and the same pair of fixing portions 11 are correspondingly disposed at two sides of the load-bearing beam 1 in the width direction. The fixing portions 11 are provided at positions corresponding to the guide rails 3 and the dampers 5, respectively. Through the fixing part 11 of the bearing beam 1, the bearing beam 1 is reliably fixed with the bottom pit concrete floor through fixing parts such as expansion bolts or chemical anchor bolts. In other embodiments, if the pit floor is of a steel plate structure, it is not excluded to use welding or bolt connection for connection and fixation.
In this embodiment, a height adjusting seat 2 is further provided between the two vertically arranged guide rails 3 and the load-bearing cross beam 1. The height of the guide rail 3 can be finely adjusted by the height adjusting base 2. And the buffer device arranged in the pit overhauling device effectively ensures the safety of the overhauling personnel during the operation at the bottom of the pit.
As shown in fig. 2, each of the height adjusting bases 2 includes: the bottom plate 21 is fixed on the top surface of the bearing beam 1; the backup plate 22 is bent upward from one side of the bottom plate 21, and one side of the bottom of the guide rail 3 is slidably held and fixed to the backup plate 22. And a backing plate 23 located above the bottom plate 21, and the bottom end of the guide rail 3 abuts against the top surface of the backing plate 23. And an adjusting screw 24 penetrating through the bottom plate 21 and abutting against the bottom surface of the backing plate 23 for adjusting the height of the guide rail 3 through the backing plate 23. And the locking nuts 25 are in threaded fit with the adjusting screw rods 24, and the locking nuts 25 on the same adjusting screw rod 24 are arranged in pairs and clamped on the upper side and the lower side of the bottom plate 21.
In the embodiment, the bottom plate 21 of the height adjusting seat 2 is formed by angle steel, and is shaped like L, a backing plate 23 is arranged above the bottom plate 21, adjusting screws 24 penetrating through the backing plate 23 and the bottom plate 21 are arranged on the backing plate 23 and the bottom plate 21, and are arranged on four corresponding corners of the backing plate 23 and the bottom plate 21 in a rectangular shape, locking nuts 25 in threaded fit with the adjusting screws 24 are arranged in pairs on the same adjusting rod and clamped on the upper side and the lower side of the bottom plate 21, a certain height is formed between the bottom plate 21 and the backing plate 23 through the matching of each adjusting screw 24 and the corresponding locking nut 25, and a certain height is formed between the bottom plate 21 and the backing plate 23 and the horizontal angle of the backing plate 23 through the matching of the screws arranged at four vertexes and the locking nuts 25, so that the purpose of finely adjusting the height.
In the present embodiment, the cross section of the guide rail 3 is "T" shaped. The bottom of the guide rail 3 is abutted against the top of the backing plate 23, and the side surface of the guide rail is movably connected to the backing plate 22.
As shown in fig. 2, the backup plate 22 is connected with a pair of first pressing plates 26, the same pair of first pressing plates 26 respectively clamp two opposite sides of the guide rail 3, and the first pressing plates 26 allow the height of the guide rail 3 to be adjusted in a loose state.
In this embodiment, the two opposite sides of the guide rail 3 are respectively and correspondingly provided with a first pressing plate 26, the two opposite sides of the guide rail 3 and the first pressing plate 26 are correspondingly provided with a long waist-shaped hole, and the length direction of the long waist-shaped hole is consistent with the length direction of the guide rail 3. The first pressing plate 26 is matched and locked with the long waist holes on the two opposite sides of the guide rail 3 through adjusting bolts. The adjusting bolt moves up and down in the length direction of the long waist hole and then is locked so as to match the height of the guide rail 3.
In this embodiment, the guide rails 3 vertically arranged at two ends of the bearing beam 1 are matched with the four adjusting screws 24 arranged at the bottoms of the guide rails 3 and the adjusting bolts arranged at two opposite sides of the guide rails 3, so that the height and horizontal direction of the guide rails 3 can be finely adjusted to adapt to different assembling conditions of the guide rails 3 on the bearing beam 1.
In the present embodiment, the hoop 4 includes: the transverse part 41, the load-bearing cross beam 1 are arranged in parallel, and the buffer 5 and the plurality of hangers 6 are connected to the transverse part 41. And connecting parts 42 fixed to both ends of the horizontal part 41, respectively, and each connecting part 42 is fixedly connected to the corresponding guide rail 3.
Further, the connecting portion 42 is connected with a pair of second pressing plates 43, and the same pair of second pressing plates 43 respectively clamp two opposite sides of the guide rail 3.
In the present embodiment, the anchor ears 4 are fixed to the corresponding guide rails 3 by the connecting portions 42 provided at both ends. The connecting portion 42 is disposed outside the guide rail 3, and second pressing plates 43 are respectively disposed inside two opposite sides of the guide rail 3, and the connecting portion 42 disposed outside the guide rail 3 clamps the two opposite sides of the guide rail 3 by the same pair of second pressing plates 43 disposed inside the guide rail 3. Two fixing holes are respectively arranged on two opposite sides of the guide rail 3 in the vertical direction, and two fixing holes are also arranged at the corresponding positions of the connecting part 42 and the second pressing plate 43. The anchor ear 4 is disposed between the two guide rails 3 through the fixing holes in a bolt connection manner and is disposed in the middle of the guide rails 3 in the height direction. It should be noted that the height of the hoop 4 enables the maintainer to stand on the maintenance ladder 7 to maintain a higher maintenance point.
As shown in fig. 3, two buffers 5 are arranged side by side, and each buffer 5 is provided with a fixing plate 51, and the fixing plate 51 is connected with the transverse portion 41 of the hoop 4 through a fixing seat 52.
In the present embodiment, the dampers 5 are rod-like structures and are vertically arranged side by side between the two guide rails 3, and each damper 5 is connected to the bottom of the connection of the load-bearing cross member 1 through a damper base 53. The buffer base 53 has a hollow structure, and the inner circumference of the hollow portion of the buffer base is attached to the outer circumference of the buffer and extends for a distance along the length direction of the buffer 5, so as to ensure that the buffer 5 having a certain height can be vertically placed along the vertical direction without tilting around. The buffer base 53 is opened to a limit function. The bottom of the buffer base 53 is provided with a connecting part bent to the periphery, and the connecting part is fixed on the bearing cross beam 1 through a bolt structure.
In the present embodiment, the two buffers 5 are fixedly connected to the fixing plate 51 and the fixing base 52 at positions corresponding to the horizontal portions 41 of the hoop 4. The fixing plate 51 has one end connected to the lateral portion 41 and the other end extending from both sides of the bumper 5 to a side facing away from the lateral portion 41 toward the bumper 5, respectively, and the fixing seat 52 is provided on a side of the bumper 5 facing away from the lateral portion 41 and fixed to the fixing plate 51. The fixing plate 51 and the fixing plate 51 cooperate to limit and connect the outer periphery of the bumper 5 upward, thereby stably fixing the bumper 5 to the horizontal portion 41.
In the present embodiment, the lateral portion 41 has a bend extending toward the bumper 5 side so that the fixing plate 51 can be fixed to the bend.
In this embodiment, the buffer 5 may be a hydraulic buffer, when the car placed in the pit descends rapidly due to some problems, the car first hits the top end of the buffer 5 to apply downward pressure, and the buffer 5 provides upward force, so that the rapidly descending car can descend slowly, and the time for the person performing maintenance in the pit to retreat to a lower and safer position is saved.
Further, a thin rod-shaped safety switch 8 is arranged at the top of the buffer 5, and when the car collides with the top end of the buffer 5, the safety switch 8 is triggered first, so that the safety switch 8 is electrified, and the elevator stops working. The buffer 5 slows down the descending speed of the cage. The personal safety of the overhaul workers working under the pit is guaranteed.
In this embodiment, the access ladder 7 is provided with at least two hanging holes 71 matched with the hanging lugs 6.
Further, at least a plurality of hanging lugs 6 are arranged in the transverse length direction of the transverse area of the hoop 4, so that the maintenance ladder stand 7 can be placed on two of the hanging lugs 6 through the hanging holes 71 to be fixed at a plurality of positions extending in the transverse direction on the transverse area. By changing the position of the maintenance ladder stand 7 on the transverse area, a plurality of maintenance points at the bottom of the cage are maintained,
specifically, the hanger 6 is formed by welding a nut to the horizontal portion 41 and screwing a long bolt in advance at the position where the nut is welded. And the hanging hole 71 is arranged at the middle position of the access ladder stand 7, and the hanging hole 71 is a gourd hole with adjustable height. When preparing the maintenance operation, will overhaul the calabash hole on the cat ladder 7 and aim at the stay bolt and install, through screwing up the stay bolt, can fix the cat ladder 7 of overhauing on staple bolt 4.
Specifically, a hanging plate 72 is movably connected between two vertical rods of the overhauling crawling ladder 7. The hanging plate 72 comprises a hanging hole plate parallel to the cross rod of the overhauling crawling ladder 7, the hanging holes are formed in the hanging hole plate, and two hanging holes 71 can be formed in the hanging hole plate generally. Two ends of the hanging hole plate are respectively bent to form connecting parts, and the two connecting parts are respectively connected to the opposite sides of the two vertical rods of the overhauling crawling ladder 7.
Further, two connecting portions of the hole hanging plate are provided with fixing holes, and a plurality of groups of paired upward-inclined protruding rods 73 are correspondingly arranged on two opposite sides of two vertical rods of the overhauling crawling ladder 7 in the height direction. The hanging plate 72 can be connected to the projecting rods 73 of different heights of the access ladder 7 through the fixing holes at two sides to increase the access range of the access personnel in the pit.
The pit overhauling device of the high-speed ladder is characterized in that a stable structure is formed by a bearing beam 1 fixed at the bottom of a hoistway, two guide rails 3 respectively vertically arranged at two ends of the bearing beam 1 side by side and a hoop 4 fixedly connected between the two guide rails 3, and the stable structure is fixed at the pit of the high-speed ladder. Through a plurality of hangers 6 that set up on staple bolt 4, can hang maintenance cat ladder 7 on staple bolt 4 through hangers 6 to through hanging maintenance cat ladder 7 on the hangers 6 of different positions, thereby change the position of maintenance cat ladder 7 in the pit, make maintainer accessible cat ladder overhaul the maintenance point to the car bottom different positions. And the pit overhauling device is simple and compact in structural arrangement and can save working hours. Especially, in a narrow space of an elevator pit, a maintainer can also realize the maintenance and operation of the bottom of the lift car without welding a complex elevator maintenance platform. Meanwhile, standardized parts can be formed for production, so that the production efficiency is improved and the installation is attractive.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A pit maintenance device of a high-speed ladder, characterized in that the pit maintenance device comprises:
the bearing cross beam is fixed at the bottom of the well;
the two height adjusting seats are respectively arranged at two ends of the bearing cross beam;
the two guide rails are arranged vertically side by side, and the bottom ends of the two guide rails are respectively fixed on the corresponding height adjusting seat;
the hoop is fixedly connected between the two guide rails and is positioned in the middle of the two guide rails in the height direction;
the bottom of the buffer is fixed on the bearing cross beam, the top of the buffer extends upwards, and the buffer and the hoop are fixed with each other through a connecting piece;
the plurality of hanging lugs are fixedly arranged on the hoop along the transverse direction;
the overhaul crawling ladder is hung on the corresponding hanging lug in position.
2. The pit inspection apparatus according to claim 1, wherein each of the height adjusting bases comprises:
the bottom plate is fixed on the top surface of the bearing cross beam;
a backup plate which is bent upwards from one side of the bottom plate, and one side of the bottom of the guide rail can be clamped and fixed on the backup plate in a sliding way,
the base plate is positioned above the bottom plate, and the bottom end of the guide rail is abutted against the top surface of the base plate;
the adjusting screw rod penetrates through the bottom plate and abuts against the bottom surface of the base plate, and is used for adjusting the height of the guide rail through the base plate;
and the locking nuts are in threaded fit with the adjusting screw rods, and the locking nuts on the same adjusting screw rod are arranged in pairs and clamped on the upper side and the lower side of the bottom plate.
3. Pit inspection apparatus according to claim 2, characterized in that
The backup plate is connected with first pressing plates in pairs, the two opposite sides of the guide rail are respectively clamped by the same pair of first pressing plates, and the guide rail is allowed to adjust the height under the condition that the first pressing plates are loosened.
4. The pit inspection apparatus of claim 1, wherein the hoop comprises:
a cross portion, wherein the bearing beams are arranged in parallel, the buffer and the plurality of hangers are connected to the cross portion,
and the connecting parts are respectively fixed at two ends of the transverse part and are fixedly connected with the guide rail on the corresponding side.
5. Pit inspection apparatus according to claim 4,
the connecting parts are connected with second pressing plates in pairs, and the same pair of second pressing plates respectively clamp the two opposite sides of the guide rail.
6. The pit inspection apparatus according to claim 4, wherein the number of the buffers is two, and each buffer is provided with a fixing plate, and the fixing plates are connected with the transverse portion of the hoop through fixing seats.
7. Pit inspection device according to claim 1, characterized in that the inspection ladder is provided with at least two hanging holes cooperating with the hanging lugs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922083581.0U CN211169385U (en) | 2019-11-27 | 2019-11-27 | Pit maintenance device of high-speed ladder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922083581.0U CN211169385U (en) | 2019-11-27 | 2019-11-27 | Pit maintenance device of high-speed ladder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211169385U true CN211169385U (en) | 2020-08-04 |
Family
ID=71824945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922083581.0U Active CN211169385U (en) | 2019-11-27 | 2019-11-27 | Pit maintenance device of high-speed ladder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211169385U (en) |
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2019
- 2019-11-27 CN CN201922083581.0U patent/CN211169385U/en active Active
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