CN218934451U - Connecting structure for arm support - Google Patents
Connecting structure for arm support Download PDFInfo
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- CN218934451U CN218934451U CN202223297556.0U CN202223297556U CN218934451U CN 218934451 U CN218934451 U CN 218934451U CN 202223297556 U CN202223297556 U CN 202223297556U CN 218934451 U CN218934451 U CN 218934451U
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- mounting plate
- arm mounting
- arm
- pin shaft
- counter bore
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
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Abstract
The utility model discloses a connecting structure for an arm support, which relates to the technical field of construction equipment of constructional engineering and solves the problems of high processing difficulty, low processing efficiency and high processing cost of the connecting structure of the existing arm support for construction, and the connecting structure comprises a first arm mounting plate connected to a first arm and a second arm mounting plate connected to a second arm, wherein the first arm mounting plate and the second arm mounting plate are fixed through a locking structure, an anti-rotation structure is arranged between the first arm mounting plate and the second arm mounting plate, the anti-rotation structure comprises at least two counter bores arranged on the first arm mounting plate and the second arm mounting plate, and the counter bores on the first arm mounting plate and the second arm mounting plate are in one-to-one correspondence; a pin shaft is arranged in the two counter bores corresponding to each other, one end of the pin shaft is inserted into the counter bore of the first section arm mounting plate, and the other end of the pin shaft is inserted into the counter bore of the second section arm mounting plate.
Description
Technical Field
The utility model relates to the technical field of construction equipment of building engineering, in particular to the technical field of connecting structures of arm frames for construction of the building engineering.
Background
Various auxiliary equipment needs to be built in the construction process of the building engineering, so that workers are more convenient in the construction process, and the safety of the workers in the construction process is ensured. The construction equipment used in tunnel engineering relates to the connection of the arm support, for example, on a drilling arch trolley, the first section arm and the second section arm which are telescopic in the middle are required to be installed and connected, and the stability of the connection has a critical effect on construction safety.
The middle telescopic first section arm and the second section arm of the drilling arch trolley in the current tunnel construction are usually fixed by adopting a bolt assembly, namely, the middle telescopic large-wall connecting plate and the second section arm connecting plate are fixed by adopting the bolt assembly, but because the arm support needs to bear larger force, in order to improve the stability of the arm support connecting position, a concave groove of a concave hexagonal structure is usually arranged on the telescopic first section arm connecting plate, and a hexagonal lug matched with the telescopic first section arm hexagonal groove is arranged on the second section arm connecting plate, so that the effect of preventing the rotation of the two connecting plates can be achieved.
However, if the cantilever crane of the drilling arch trolley used in tunnel construction adopts the installation structure, the problem of higher processing difficulty exists, and when the raised hexagonal convex blocks and the recessed hexagonal grooves are processed on the connecting plate, the protruding hexagonal convex blocks and the recessed hexagonal grooves are all required to be placed on a milling machine for processing, so that the processing difficulty is high, the processing efficiency is low, and the problem of higher cost exists.
Disclosure of Invention
The utility model aims to solve the problems of high processing difficulty, low processing efficiency and high processing cost of the existing connecting structure of the cantilever crane for construction.
The utility model adopts the following technical scheme for realizing the purposes:
the connecting structure for the arm support comprises a first arm mounting plate and a second arm mounting plate, wherein the first arm mounting plate is connected to a first arm, the second arm mounting plate is connected to a second arm, the first arm mounting plate and the second arm mounting plate are fixed through a locking structure, an anti-rotation structure is arranged between the first arm mounting plate and the second arm mounting plate, the anti-rotation structure comprises counter bores arranged on the first arm mounting plate and the second arm mounting plate, the number of the counter bores on the first arm mounting plate and the second arm mounting plate is at least two, and the counter bores on the first arm mounting plate and the counter bores on the second arm mounting plate are in one-to-one correspondence; two corresponding counter bores are internally provided with a pin shaft, one end of the pin shaft is inserted into the counter bore of the first section arm mounting plate, and the other end of the pin shaft is inserted into the counter bore of the second section arm mounting plate.
The processing method comprises the following steps: when the connecting structure of the arm support for the construction of the building engineering is processed, more than two counter bores are respectively punched on the first arm mounting plate and the second arm mounting plate.
The installation method comprises the following steps: when the first arm mounting plate and the second arm mounting plate are connected, one end of a prepared pin shaft is inserted into a counter bore of the first arm mounting plate or the second arm mounting plate, then the counter bore on the other mounting plate is aligned with the pin shaft, two ends of the pin shaft can be respectively inserted into the counter bores of the first arm mounting plate and the second arm mounting plate, and finally the first arm mounting plate and the second arm mounting plate are locked and fixed through a locking structure.
Compared with the prior art, this application prevents through setting up the counter bore on first festival arm mounting panel and second festival arm mounting panel, through the mode of installing the round pin axle in the counter bore that first festival arm mounting panel and second festival arm mounting panel are rotatory, because the round pin axle can select standard part, so this kind of structure can reduce a large amount of processing cost, and processing and installation procedure are also very simple, the process time of whole structure has been shortened, and then machining efficiency has been improved, and can be according to the quantity of the size design counter bore of actual first festival arm mounting panel and second festival arm mounting panel, anti-rotation effect is also better.
Further, the cross sections of the counter bores on the first knuckle arm mounting plate and the second knuckle arm mounting plate are round, and the cross section of the pin shaft is also round.
The pin shaft is characterized in that an internal thread is arranged in a counter bore on the first arm mounting plate or the second arm mounting plate, and an external thread connected with the counter bore provided with the internal thread is arranged at any one end of the pin shaft.
During installation, one end of the pin shaft provided with the external thread is inserted into the counter bore provided with the internal thread for screwing, and then the other end of the pin shaft is inserted into the counter bore of the other mounting plate without the internal thread.
The counter bores provided with the internal threads are not limited to be arranged on the same mounting plate, for example, in the case that two counter bores are arranged on each mounting plate, one counter bore on one mounting plate can be provided with a structure containing the internal threads, and the other counter bore does not contain the internal threads; the other mounting plate is also provided with a counter bore with internal threads, and the other counter bore does not have internal threads; it should be noted, however, that the counterbore with internal threads needs to be aligned with a counterbore on the other mounting plate that does not contain internal threads.
This application is through setting up the internal thread in the counter bore, sets up the external screw thread simultaneously at the round pin epaxial, makes the staff when installing the round pin axle, can fix the round pin axle on one of them mounting panel earlier, makes the staff more convenient when the installation, has shortened installation time, has improved installation effectiveness, also makes the fixed effect of round pin axle better through threaded connection simultaneously, has further strengthened the steadiness of being connected between first festival arm mounting panel and the second festival arm mounting panel.
Further, the cross section of the counter bore is polygonal, and the cross section of the pin shaft is the same as the cross section of the counter bore.
Wherein the polygon comprises triangle and quadrangle.
Further, a positioning structure is arranged between the first arm mounting plate and the second arm mounting plate.
The positioning structure comprises a positioning pin connected to the first arm mounting plate, and a positioning hole for mounting the positioning pin is formed in the second arm mounting plate.
When the first arm mounting plate and the second arm mounting plate are combined and mounted, a worker inserts a locating pin mounted on the first arm mounting plate into a locating hole of the second arm mounting plate, and the first arm mounting plate and the second arm mounting plate can be aligned, so that counter bores arranged on the first arm mounting plate and the second arm mounting plate are aligned with each other, and a pin shaft is inserted into the counter bores aligned with each other.
Wherein the locating pin can also be installed on the second arm mounting plate, and then corresponding locating hole just sets up on the first arm mounting plate.
This application is through setting up location structure between first festival arm mounting panel and second festival arm mounting panel, can be in the installation with the counter bore on the first festival arm mounting panel and the counter bore alignment on the second festival arm mounting panel through location structure, avoids the staff to appear the condition that the counter bore misplaced in the installation, has further shortened installation time, has improved installation effectiveness.
Further, the locking structure includes a plurality of bolt holes provided on the first arm mounting plate and the second arm mounting plate, and the first arm mounting plate and the second arm mounting plate are fixed by mounting bolts in the bolt holes.
After the first arm installation plate and the second arm installation plate are aligned, the bolt holes on the first arm installation plate and the bolt holes on the second arm installation plate are also aligned, and the first arm installation plate and the second arm installation plate can be fixed by inserting the locking bolts into the bolt holes to be screwed by a worker.
The first arm installation plate and the second arm installation plate are provided with a plurality of bolt holes, and the bolt holes are arranged at the edges of the first arm installation plate and the second arm installation plate.
The application adopts the bolt assembly to lock first festival arm mounting panel and second festival arm mounting panel fixed, not only makes the staff more convenient at the operation of installation in-process, also makes arm mounting panel and second festival arm mounting panel connect more stable simultaneously, and then has improved the security in the work progress.
The beneficial effects of the utility model are as follows:
(1) According to the anti-rotation device, the counter bores are formed in the first arm mounting plate and the second arm mounting plate, the pin shafts are arranged in the counter bores to prevent the first arm mounting plate and the second arm mounting plate from rotating, and the pin shafts can select standard components, so that a large number of processing cost can be reduced, processing and mounting procedures are very simple, the processing time of the whole structure is shortened, the processing efficiency is improved, the counter bores can be designed according to the size of the actual first arm mounting plate and the actual second arm mounting plate, and the anti-rotation effect is better;
(2) According to the method, the internal threads are arranged in the counter bore, and the external threads are arranged on the pin shaft, so that a worker can fix the pin shaft on one of the mounting plates when mounting the pin shaft, the worker can more conveniently mount the pin shaft, the mounting time is shortened, the mounting efficiency is improved, the fixing effect of the pin shaft is better through threaded connection, and the connection stability between the first arm mounting plate and the second arm mounting plate is further enhanced;
(3) According to the positioning structure, the positioning structure is arranged between the first arm mounting plate and the second arm mounting plate, so that the counter bores on the first arm mounting plate and the counter bores on the second arm mounting plate can be aligned through the positioning structure in the mounting process, the situation that the counter bores are misplaced by workers in the mounting process is avoided, the mounting time is further shortened, and the mounting efficiency is improved;
(4) The application adopts the bolt assembly to lock first festival arm mounting panel and second festival arm mounting panel fixed, not only makes the staff more convenient at the operation of installation in-process, also makes arm mounting panel and second festival arm mounting panel connect more stable simultaneously, and then has improved the security in the work progress.
Drawings
Fig. 1 is a schematic structural view of embodiment 1 of the present utility model;
fig. 2 is a schematic structural view of embodiment 2 of the present utility model;
fig. 3 is a schematic structural view of embodiment 3 of the present utility model;
fig. 4 is a schematic structural view of embodiment 4 of the present utility model;
fig. 5 is a schematic structural view of embodiment 4 of the present utility model;
fig. 6 is a schematic structural view of a conventional arm support connection structure.
Reference numerals: 01-first section arm mounting plate, 02-bolt hole, 03-locating pin, 04-counter bore, 05-pin shaft, 06-locating hole, 07-second section arm mounting plate, 08-external screw thread, 09-internal screw thread.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.
Example 1
Referring to fig. 1, this embodiment provides a connection structure for an arm support, including a first arm mounting plate 01 connected to a first arm and a second arm mounting plate 07 connected to a second arm, where the first arm mounting plate 01 and the second arm mounting plate 07 are fixed by a locking structure, an anti-rotation structure is provided between the first arm mounting plate 01 and the second arm mounting plate 07, the anti-rotation structure includes counter bores 04 provided on the first arm mounting plate 01 and the second arm mounting plate 07, the number of counter bores 04 on the first arm mounting plate 01 and the second arm mounting plate 07 is two, and the counter bores 04 on the first arm mounting plate 01 and the counter bores 04 on the second arm mounting plate 07 are in one-to-one correspondence; a pin shaft 05 is arranged in the two counter bores 04 which correspond to each other, one end of the pin shaft 05 is inserted into the counter bore 04 of the first knuckle arm mounting plate 01, and the other end of the pin shaft 05 is inserted into the counter bore 04 of the second knuckle arm mounting plate 07.
The cross section of the counter bore 04 is circular, and the cross section of the pin shaft 05 is also circular.
Wherein a positioning structure is arranged between the first arm mounting plate 01 and the second arm mounting plate 07; the positioning structure comprises a positioning pin 03 connected to a first arm mounting plate 01, and a positioning hole 06 for mounting the positioning pin 03 is formed in a second arm mounting plate 07.
Wherein, locking structure is including setting up a plurality of bolt holes 02 on first festival arm mounting panel 01 and second festival arm mounting panel 07, and through installing the bolt in bolt hole 02 with first festival arm mounting panel 01 and second festival arm mounting panel 07 are fixed.
Referring to fig. 1 and 6, compared with the existing arm support connecting structure, the anti-rotation device has the advantages that the counter bores 04 are formed in the first arm mounting plate 01 and the second arm mounting plate 07, the first arm mounting plate 01 and the second arm mounting plate 07 are prevented from rotating in the counter bores 04 in a pin shaft 05 mounting mode, a large number of machining cost can be reduced due to the fact that the pin shaft 05 can select standard components, machining and mounting procedures are quite simple, machining time of the whole structure is shortened, machining efficiency is improved, the number of counter bores 04 can be designed according to the actual sizes of the first arm mounting plate 01 and the second arm mounting plate 07, and anti-rotation effect is better.
Example 2
Referring to fig. 2, this embodiment provides a connection structure for an arm support, including a first arm mounting plate 01 connected to a first arm and a second arm mounting plate 07 connected to a second arm, where the first arm mounting plate 01 and the second arm mounting plate 07 are fixed by a locking structure, an anti-rotation structure is provided between the first arm mounting plate 01 and the second arm mounting plate 07, the anti-rotation structure includes counter bores 04 provided on the first arm mounting plate 01 and the second arm mounting plate 07, the number of counter bores 04 on the first arm mounting plate 01 and the second arm mounting plate 07 is two, and the counter bores 04 on the first arm mounting plate 01 and the counter bores 04 on the second arm mounting plate 07 are in one-to-one correspondence; a pin shaft 05 is arranged in the two counter bores 04 which correspond to each other, one end of the pin shaft 05 is inserted into the counter bore 04 of the first knuckle arm mounting plate 01, and the other end of the pin shaft 05 is inserted into the counter bore 04 of the second knuckle arm mounting plate 07.
The cross section of the counter bore 04 is circular, and the cross section of the pin shaft 05 is also circular; internal threads 09 are arranged in two counter bores 04 on the first arm mounting plate 01, and external threads 08 connected with the counter bores 04 provided with the internal threads 09 are arranged at any one end of the pin shaft 05.
Wherein a positioning structure is arranged between the first arm mounting plate 01 and the second arm mounting plate 07; the positioning structure comprises a positioning pin 03 connected to a first arm mounting plate 01, and a positioning hole 06 for mounting the positioning pin 03 is formed in a second arm mounting plate 07.
Wherein, locking structure is including setting up a plurality of bolt holes 02 on first festival arm mounting panel 01 and second festival arm mounting panel 07, and through installing the bolt in bolt hole 02 with first festival arm mounting panel 01 and second festival arm mounting panel 07 are fixed.
Example 3
Referring to fig. 3, this embodiment provides a connection structure for an arm support, including a first arm mounting plate 01 connected to a first arm and a second arm mounting plate 07 connected to a second arm, where the first arm mounting plate 01 and the second arm mounting plate 07 are fixed by a locking structure, an anti-rotation structure is provided between the first arm mounting plate 01 and the second arm mounting plate 07, the anti-rotation structure includes counter bores 04 provided on the first arm mounting plate 01 and the second arm mounting plate 07, the number of counter bores 04 on the first arm mounting plate 01 and the second arm mounting plate 07 is two, and the counter bores 04 on the first arm mounting plate 01 and the counter bores 04 on the second arm mounting plate 07 are in one-to-one correspondence; a pin shaft 05 is arranged in the two counter bores 04 which correspond to each other, one end of the pin shaft 05 is inserted into the counter bore 04 of the first knuckle arm mounting plate 01, and the other end of the pin shaft 05 is inserted into the counter bore 04 of the second knuckle arm mounting plate 07.
The cross section of the counter bore 04 is circular, and the cross section of the pin shaft 05 is also circular; an internal thread 09 is arranged in one counter bore 04 on the first arm mounting plate 01, and the internal thread 09 is not arranged in the other counter bore 04; the counter bore 04 on the second knuckle arm mounting plate 07 corresponding to the counter bore 04 on the first knuckle arm mounting plate 01 provided with the internal thread 09 is not provided with the internal thread 09, and the counter bore 04 on the second knuckle arm mounting plate 07 corresponding to the counter bore 04 on the first knuckle arm mounting plate 01 provided with the internal thread 09 is provided with the internal thread 09; either end of the pin 05 is provided with external threads 08 which connect with a counterbore 04 provided with internal threads 09.
Wherein a positioning structure is arranged between the first arm mounting plate 01 and the second arm mounting plate 07; the positioning structure comprises a positioning pin 03 connected to a first arm mounting plate 01, and a positioning hole 06 for mounting the positioning pin 03 is formed in a second arm mounting plate 07.
Wherein, locking structure is including setting up a plurality of bolt holes 02 on first festival arm mounting panel 01 and second festival arm mounting panel 07, and through installing the bolt in bolt hole 02 with first festival arm mounting panel 01 and second festival arm mounting panel 07 are fixed.
Example 4
Referring to fig. 4, this embodiment provides a connection structure for an arm support, including a first arm mounting plate 01 connected to a first arm and a second arm mounting plate 07 connected to a second arm, where the first arm mounting plate 01 and the second arm mounting plate 07 are fixed by a locking structure, an anti-rotation structure is provided between the first arm mounting plate 01 and the second arm mounting plate 07, the anti-rotation structure includes counter bores 04 provided on the first arm mounting plate 01 and the second arm mounting plate 07, the number of counter bores 04 on the first arm mounting plate 01 and the second arm mounting plate 07 is two, and the counter bores 04 on the first arm mounting plate 01 and the counter bores 04 on the second arm mounting plate 07 are in one-to-one correspondence; a pin shaft 05 is arranged in the two counter bores 04 which correspond to each other, one end of the pin shaft 05 is inserted into the counter bore 04 of the first knuckle arm mounting plate 01, and the other end of the pin shaft 05 is inserted into the counter bore 04 of the second knuckle arm mounting plate 07.
The cross section of the counter bore 04 is triangular, and the cross section of the pin shaft 05 is also triangular.
Wherein a positioning structure is arranged between the first arm mounting plate 01 and the second arm mounting plate 07; the positioning structure comprises a positioning pin 03 connected to a first arm mounting plate 01, and a positioning hole 06 for mounting the positioning pin 03 is formed in a second arm mounting plate 07.
Wherein, locking structure is including setting up a plurality of bolt holes 02 on first festival arm mounting panel 01 and second festival arm mounting panel 07, and through installing the bolt in bolt hole 02 with first festival arm mounting panel 01 and second festival arm mounting panel 07 are fixed.
Example 5
Referring to fig. 5, this embodiment provides a connection structure for an arm support, including a first arm mounting plate 01 connected to a first arm and a second arm mounting plate 07 connected to a second arm, where the first arm mounting plate 01 and the second arm mounting plate 07 are fixed by a locking structure, an anti-rotation structure is provided between the first arm mounting plate 01 and the second arm mounting plate 07, the anti-rotation structure includes counter bores 04 provided on the first arm mounting plate 01 and the second arm mounting plate 07, the number of counter bores 04 on the first arm mounting plate 01 and the second arm mounting plate 07 is two, and the counter bores 04 on the first arm mounting plate 01 and the counter bores 04 on the second arm mounting plate 07 are in one-to-one correspondence; a pin shaft 05 is arranged in the two counter bores 04 which correspond to each other, one end of the pin shaft 05 is inserted into the counter bore 04 of the first knuckle arm mounting plate 01, and the other end of the pin shaft 05 is inserted into the counter bore 04 of the second knuckle arm mounting plate 07.
The cross section of the counter bore 04 is quadrilateral, and the cross section of the pin shaft 05 is also quadrilateral.
Wherein a positioning structure is arranged between the first arm mounting plate 01 and the second arm mounting plate 07; the positioning structure comprises a positioning pin 03 connected to a first arm mounting plate 01, and a positioning hole 06 for mounting the positioning pin 03 is formed in a second arm mounting plate 07.
Wherein, locking structure is including setting up a plurality of bolt holes 02 on first festival arm mounting panel 01 and second festival arm mounting panel 07, and through installing the bolt in bolt hole 02 with first festival arm mounting panel 01 and second festival arm mounting panel 07 are fixed.
Claims (9)
1. The connecting structure for the arm support comprises a first arm mounting plate (01) connected to a first arm and a second arm mounting plate (07) connected to a second arm, wherein the first arm mounting plate (01) and the second arm mounting plate (07) are fixed through a locking structure;
the counter bores (04) on the first section arm mounting plates (01) are in one-to-one correspondence with the counter bores (04) on the second section arm mounting plates (07); two counter bores (04) corresponding to each other are internally provided with a pin shaft (05), one end of the pin shaft (05) is inserted into the counter bore (04) of the first knuckle arm mounting plate (01), and the other end of the pin shaft is inserted into the counter bore (04) of the second knuckle arm mounting plate (07).
2. The connecting structure for the arm support according to claim 1, wherein the cross sections of the counter bores (04) on the first arm mounting plate (01) and the second arm mounting plate (07) are circular, and the cross section of the pin shaft (05) is also circular.
3. The connecting structure for the arm support according to claim 2, wherein an internal thread (09) is arranged in a counter bore (04) on the first arm mounting plate (01) or the second arm mounting plate (07), and an external thread (08) connected with the counter bore (04) provided with the internal thread (09) is arranged at any one end of the pin shaft (05).
4. The connecting structure for the arm support according to claim 1, wherein the cross section of the counter bore (04) is polygonal, and the cross section of the pin shaft (05) is the same as the cross section of the counter bore.
5. The connection structure for the boom according to claim 4, wherein the polygon comprises a triangle or a quadrangle.
6. The connecting structure for the arm support according to claim 1, wherein a positioning structure is provided between the first arm mounting plate (01) and the second arm mounting plate (07).
7. A connection structure for a boom according to claim 6, characterized in that the positioning structure comprises a positioning pin (03) connected to the first boom mounting plate (01), and that the second boom mounting plate (07) is provided with a positioning hole (06) for mounting the positioning pin (03).
8. A connection structure for a boom according to claim 6, characterized in that the positioning structure comprises a positioning pin (03) connected to the second boom mounting plate (07), and that the first boom mounting plate (01) is provided with a positioning hole (06) for mounting the positioning pin (03).
9. A connection structure for an arm support according to claim 1, characterized in that the locking structure comprises a plurality of bolt holes (02) provided on the first arm mounting plate (01) and the second arm mounting plate (07), the first arm mounting plate (01) and the second arm mounting plate (07) being fixed by mounting bolts in the bolt holes (02).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223297556.0U CN218934451U (en) | 2022-12-09 | 2022-12-09 | Connecting structure for arm support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223297556.0U CN218934451U (en) | 2022-12-09 | 2022-12-09 | Connecting structure for arm support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218934451U true CN218934451U (en) | 2023-04-28 |
Family
ID=86067177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223297556.0U Active CN218934451U (en) | 2022-12-09 | 2022-12-09 | Connecting structure for arm support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218934451U (en) |
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2022
- 2022-12-09 CN CN202223297556.0U patent/CN218934451U/en active Active
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