CN219827485U - Axle body sealing mechanism, wheel set for crane and crane - Google Patents
Axle body sealing mechanism, wheel set for crane and crane Download PDFInfo
- Publication number
- CN219827485U CN219827485U CN202321381231.2U CN202321381231U CN219827485U CN 219827485 U CN219827485 U CN 219827485U CN 202321381231 U CN202321381231 U CN 202321381231U CN 219827485 U CN219827485 U CN 219827485U
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- bushing
- ring
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- sealing
- shaft
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- 238000007789 sealing Methods 0.000 title claims abstract description 76
- 230000007246 mechanism Effects 0.000 title claims abstract description 26
- 230000000149 penetrating effect Effects 0.000 claims abstract description 5
- 230000007423 decrease Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 5
- 239000004519 grease Substances 0.000 abstract description 18
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 230000001050 lubricating effect Effects 0.000 description 14
- 230000000694 effects Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 229920005560 fluorosilicone rubber Polymers 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- Sealing Devices (AREA)
Abstract
Compared with the prior art, the shaft body sealing mechanism disclosed by the utility model comprises the following components: a shaft body; the first bushing is sleeved on the outer side of the shaft body; a through cover penetrating the outer side of the first bushing; the second bushing is sleeved on the first bushing; a sealing device disposed between the through cap and the second bushing; and the check ring is arranged on the through cover and used for limiting the sealing device to be separated. Compared with the prior art, the scheme of the utility model is not easy to leak grease and does not need frequent maintenance, so that the environmental pollution caused by the leaked grease is reduced.
Description
Technical Field
The utility model relates to the technical field of hoisting machinery equipment, in particular to a shaft body sealing mechanism, a wheel set for a crane and the crane.
Background
At present, the sealing of the bearing positions of wheel sets used on various cranes such as portal cranes, bridge cranes, container portal cranes, shore container cranes and the like is mostly realized by arranging felt ring oil seals (JB/ZQ 4606) at the positions, which are contacted with the axle journals, on end covers at the two ends of the bearings, and the oil seals are characterized by self structure, and after the crane equipment is used for a period of time, lubricating grease filled at the bearing positions leaks out from the felt ring oil seals arranged at the positions, which are contacted with the axle journals, on the end covers.
With the increase of the environmental temperature and the increase of the use frequency of the use site of the hoisting equipment, leakage gradually increases, so that a large amount of lubricating grease is wasted and the maintenance frequency is increased, the use cost is increased, and the use efficiency of the equipment is reduced. Meanwhile, leaked lubricating grease can leak in a working area of the lifting equipment along with the movement of the lifting equipment, so that the cleaning is troublesome and the environment is polluted.
Therefore, how to provide a shaft body sealing mechanism which is not easy to leak grease and does not need frequent maintenance, and reduces environmental pollution caused by the leaked grease has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a shaft body sealing mechanism which is not easy to leak lubricating grease and does not need frequent maintenance, and reduces environmental pollution caused by the leaked lubricating grease.
The technical scheme provided by the utility model is as follows:
the utility model provides a shaft body sealing mechanism, comprising: a shaft body; the first bushing is sleeved on the outer side of the shaft body; a through cover penetrating the outer side of the first bushing; the second bushing is sleeved on the first bushing; a sealing device disposed between the through cap and the second bushing; and the check ring is arranged on the through cover and used for limiting the sealing device to be separated.
Further, in a preferred form of the utility model, one end of the first bushing is provided with a mounting interface with the second bushing; one end of the second bushing abuts against the step of the first bushing.
Further, in a preferred mode of the present utility model, the second bushing is tubular in shape, and the surface roughness value of the outer circumferential surface of the second bushing is one of ra0.8, ra1.6, and ra 3.2; the surface hardness of the second bushing is HRC20-60; the outer diameter size of the second bushing is 0.1-0.5mm larger than the basic size, and the second bushing is in interference connection with the sealing device.
Further, in a preferred mode of the utility model, a slot hole site is arranged on the inner side of the through cover, which is close to the shaft body, and the slot hole site is an annular cavity; the sealing device comprises: the sealing ring body is arranged in the slot position, and one end of the sealing ring body is abutted against the inner wall of one end of the slot position; the groove hole site is provided with a mounting groove for the retainer ring to be matched with; the check ring is an elastic check ring and is used for being clamped in the mounting groove.
Further, in a preferred mode of the present utility model, the seal ring body includes: the inner ring part is used for abutting against the outer wall of the second bushing, and a plurality of convex rings are arranged on the inner wall of the inner ring part; an outer ring part for abutting against the inner hole wall of the through cover; a joint portion for connecting the same side ends of the inner ring portion and the outer ring portion; and a ring groove portion interposed between the inner ring portion and the outer ring portion and opposed to the joint portion.
Further, in a preferred mode of the present utility model, the diameters of the inner rings of the plurality of convex rings gradually increase or gradually decrease from the joint portion end to the ring groove portion end; the diameter of the inner ring part is 0.2-2mm smaller than the diameter of the outer circle of the second bushing.
Further, in a preferred mode of the present utility model, the seal ring body is a seal ring made of flexible wear-resistant oil-resistant material. Further, the sealing ring body can be made of nitrile rubber, fluororubber, acrylic rubber, fluorosilicone rubber and the like.
Further, in a preferred mode of the present utility model, the sealing ring body abuts against an inner wall of one end of the slot hole position of the through cover through the joint portion.
Further, in a preferred mode of the present utility model, the cross section of the ring groove is in a V-shaped structure with large outside and small inside.
In addition, the utility model also provides a wheel set for a crane, which comprises: the shaft body sealing mechanism is used as a wheel shaft; the wheel body is arranged in the middle of the shaft body; bearings arranged at two ends of the shaft body; the bearing seat is used for supporting and mounting the bearing; the end cover is arranged on the bearing seat and positioned at the axle end side of the wheel; the through cover is arranged on the bearing seat and opposite to the end cover, one end of the first bushing is abutted against the wheel body, and the other end of the first bushing is abutted against the bearing, so that the novel wheel has the technical effects.
In addition, the utility model also provides a crane, comprising: the shaft body sealing mechanism has the technical effects.
Compared with the prior art, the shaft body sealing mechanism provided by the utility model comprises the following components: a shaft body; the first bushing is sleeved on the outer side of the shaft body; a through cover penetrating the outer side of the first bushing; a sealing device disposed between the through cap and the first bushing; the second bushing is sleeved on the first bushing and positioned between the first bushing and the sealing device; and the check ring is arranged on the through cover and used for limiting the sealing device to be separated. In the technical scheme, the surface roughness values of the outer circular surface of the second bushing are Ra0.8, ra1.6 and Ra3.2, the outer diameter size is 0.1-0.5mm larger than the basic size, the surface smoothness is high, the second bushing is in contact with the inner ring of the sealing device, the second bushing is not easy to wear and damage, meanwhile, the second bushing is in interference connection with the sealing device, the tightness and the fit are better, lubricating grease in the through cover, the end cover and the bearing seat space is not easy to leak, and the sealing effect is good. The second bushing is directly sleeved on the first bushing, is close to one end of the bearing, has a length larger than the thickness of the sealing device, is directly of an integral bushing structure, greatly reduces the processing precision and surface quality requirements of the first bushing, is directly ensured by the second bushing, and has the advantages of excellent manufacturability, cost economy and the like. Simultaneously, the existing crane locomotive wheelset is also convenient to reform according to the technical scheme. The inner ring of the sealing device is provided with a plurality of convex rings, such as a convex ring C and a convex ring D, the diameter of the inner ring of each convex ring gradually increases and gradually decreases from one end to the other end in the thickness direction, and the diameter of the inner ring is 0.2-2mm smaller than the diameter of the outer circle of the second bushing. The inner ring of the bearing is in interference connection with the outer circular surface of the second bushing, the inner ring of the bearing is in gradient contact with the outer circular surface of the second bushing, and lubricating grease in the spaces of the through cover, the end cover and the bearing seat is less prone to leakage, so that the sealing performance is more stable and reliable. The retaining ring card is located one end in the logical lid makes sealing device installation dismantlement more convenient.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional view of a shaft seal mechanism provided by an embodiment of the present utility model;
FIG. 2 is an enlarged partial schematic view of FIG. 1A;
FIG. 3 is an enlarged partial schematic view of FIG. 1B;
fig. 4 is a schematic view of a through cover structure according to an embodiment of the present utility model;
fig. 5 is a schematic layout diagram of a multi-channel convex ring according to an embodiment of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present utility model, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "first," "second," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" or "a number" means two or more, unless specifically defined otherwise.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the utility model, which is defined by the claims, but rather by the claims, unless otherwise indicated, and that any structural modifications, proportional changes, or dimensional adjustments, which would otherwise be apparent to those skilled in the art, would be made without departing from the spirit and scope of the utility model.
As shown in fig. 1 to 5, a shaft body sealing mechanism provided in an embodiment of the present utility model includes: a shaft body 2;
a first bushing 6 sleeved outside the shaft body 2; a through cover 3 penetrating the outer side of the first bushing 6; the second bushing 7 is sleeved on the first bushing 6; a sealing means 9 arranged between said through cover 3 and said second bushing 7; a retainer ring 10 provided on the through cap 3 for restricting the detachment of the sealing means.
Specifically, in an embodiment of the present utility model, one end of the first bush 6 is provided with a mounting interface with the second bush 7; one end of the second bush 7 abuts against the step of the first bush 6.
Specifically, in the embodiment of the present utility model, the second bushing 7 is tubular in shape, and the surface roughness value of the outer circumferential surface of the second bushing 7 is one of ra0.8, ra1.6, and ra 3.2; the surface hardness of the second bushing 7 is HRC20-60; the outer diameter dimension of the second bushing 7 is 0.1-0.5mm larger than the basic dimension, and the second bushing 7 is in interference connection with the sealing device 9.
Specifically, in the embodiment of the present utility model, a slot hole site 31 is provided on the inner side of the through cover 3 near the shaft body 2, and the slot hole site 31 is an annular cavity; the sealing means 9 comprises: the sealing ring body 92 is arranged in the slot hole position 31, and one end of the sealing ring body 92 is abutted against the inner wall of one end of the slot hole position 31; the slotted hole position 31 is provided with a mounting groove 31A for matching the check ring 10; the retainer ring 10 is an elastic retainer ring 10, and the retainer ring 10 is used for being clamped in the mounting groove 31A.
Specifically, in an embodiment of the present utility model, the seal ring body 92 includes: an inner ring portion 921 for abutting against the outer wall of the second bush 7, wherein a plurality of convex rings 925 are provided on the inner wall of the inner ring portion 921; an outer ring portion 922 for abutting against the inner hole wall of the through cover 3; a coupling portion 923 for coupling the same side ends of the inner ring portion 921 and the outer ring portion 922; a ring groove 924 interposed between the inner ring portion 921 and the outer ring portion 922 and facing the coupling portion 923.
Specifically, in the embodiment of the present utility model, the diameters of the inner rings of the plurality of convex rings 925 gradually increase or gradually decrease from the end of the coupling portion 923 toward the end of the ring groove portion 924; the inner ring diameter of the inner ring portion 921 is 0.2-2mm smaller than the outer circumference diameter of the second bush 7.
Specifically, in the embodiment of the present utility model, the seal ring body 92 is a seal ring made of flexible wear-resistant and oil-resistant material. Further, the material of the seal ring body 92 may be nitrile rubber, fluororubber, acrylate rubber, fluorosilicone rubber, etc.
Specifically, in the embodiment of the present utility model, the sealing ring body 92 abuts against an inner wall of one end of the slot position 31 of the through cover 3 through the coupling portion 923.
Specifically, in the embodiment of the present utility model, the cross section of the ring groove 924 has a V-shaped structure with a large outside and a small inside.
In addition, the utility model also provides a wheel set for a crane, which comprises: the shaft body 2 is used as a wheel shaft; the wheel body is arranged in the middle of the shaft body 2; bearings 8 arranged at both ends of the shaft body 2; a bearing seat 5 for supporting and mounting the bearing; an end cover 4 provided on the bearing housing 5 and located at the wheel axle end side; the through cover 5 is disposed on the bearing seat 5 and located opposite to the end cover 4, one end of the first bushing 6 abuts against the wheel body 1, and the other end of the first bushing 6 abuts against the bearing 8.
In addition, the utility model also provides a crane, comprising: the shaft body sealing mechanism has the technical effects.
More specifically, the utility model relates to a shaft sealing mechanism, which aims at the defects of the existing wheel sets used on the cranes such as portal cranes, bridge cranes, container portal cranes, shore container cranes and the like in the use process, and provides a shaft sealing mechanism which is not easy to leak lubricating grease and does not need frequent maintenance (filling of lubricating grease) and reduces the environmental pollution caused by the leaked lubricating grease, and a crane with the wheel sets.
The utility model relates to a shaft body sealing mechanism which mainly comprises a wheel body 1, a wheel shaft 2, a through cover 3, an end cover 4, a bearing seat 5 and a bearing 8. The wheel is sleeved on the wheel shaft 2, one end of the wheel is connected with the wheel body 1, the other end of the wheel is connected with the inner ring of the bearing 8, and the first bushing 6 is used for limiting the axial positions of the bearing 8 and the wheel body 1 on the wheel shaft 2; the second lining 7 is sleeved on the first lining 6 and is positioned at the side close to the bearing 8 and is matched with the sealing device 9 to form a good sealing effect; the sealing device 9 is sleeved on the outer circular surface of the second bushing 7 and in the slotted hole of the through cover 3; a retainer ring 10 disposed at one end portion of the through cap 3 for defining the axial position of the sealing device 9.
The first bushing 6 is mainly characterized in that: one end of the second bushing 7, which is close to the bearing, is provided with a mounting interface which forms a tight fit connection with the second bushing and can be axially limited on the mounting interface.
The second bushing 7 is mainly characterized in that: the sealing device is sleeved on the first bushing 6, one end of the sealing device is connected with the upper step of the first bushing 6 in a abutting mode so as to limit the axial position of the sealing device, the sealing device is tubular as a whole, the length of the sealing device is larger than the thickness of the sealing device 9, the roughness values of the outer circular surface are Ra0.8, ra1.6 and Ra3.2, the outer diameter size is 0.1-0.5mm larger than the basic size, the sealing device and the sealing device are in interference connection, and the inner diameter and the outer circular surface of the first bushing 6 are in tight fit connection.
The sealing device 9 is mainly characterized in that: the whole body is of an annular structure, a rigid framework is arranged in the annular structure, a plurality of convex rings, such as a convex ring C and a convex ring D, are arranged in the inner ring, the diameters of the inner rings of the convex rings gradually increase and gradually decrease from one end to the other end in the thickness direction of the inner ring, and the diameters of the inner rings are 0.2-2mm smaller than the diameters of the outer circles of the second bushings 7; the inner ring of the through hole is sleeved on the outer circular surface of the second bushing 7, and the outer ring of the through hole is arranged in the slot hole of the through cover 3. Is made of flexible wear-resistant and oil-resistant materials.
The retainer ring 10 is clamped at one end in the through cover 3, and is used for limiting the axial position of the sealing device 9, preferably an elastic retainer ring.
The beneficial effects of the utility model are as follows:
1. the surface roughness value of the outer circular surface of the second bushing 7 is Ra0.8, ra1.6 and Ra3.2, the outer diameter size is 0.1-0.5mm larger than the basic size, the surface smoothness is high, the second bushing is abutted against the inner ring of the sealing device 9, the second bushing is not easy to wear and damage, meanwhile, the second bushing is in interference connection with the sealing device 9, the tightness and the fitting performance are better, lubricating grease in the spaces of the through cover 3, the end cover 4 and the bearing seat 5 is not easy to leak, and the sealing effect is good.
2. The second bushing 7 is directly sleeved on the first bushing 6 and is close to one end of the bearing 8, the length of the second bushing is larger than the thickness of the sealing device 9, the first bushing 6 directly adopts an integral bushing structure, the processing precision and the surface quality requirements of the first bushing are greatly reduced, the processing precision and the surface quality requirements related to the sealing performance are directly ensured by the second bushing 7, and the second bushing has the advantages of excellent manufacturability, cost economy and the like. Simultaneously, the existing crane locomotive wheelset is also convenient to reform according to the technical scheme.
3. The inner ring of the sealing device 9 is provided with a plurality of convex rings, such as a convex ring C and a convex ring D, the diameter of the inner ring of each convex ring gradually increases and gradually decreases from one end to the other end in the thickness direction, and the diameter of the inner ring is 0.2-2mm smaller than the diameter of the outer circle of the second bushing 7. The inner ring of the lubricating grease is in interference connection with the outer circular surface of the second bushing 7, the inner ring of the lubricating grease is in gradient contact with the outer circular surface of the second bushing 7, and the lubricating grease in the spaces of the through cover 3, the end cover 4 and the bearing seat 5 is less prone to leakage, so that the sealing performance is more stable and reliable.
4. The retainer ring 10 is clamped at one end in the through cover 3, so that the sealing device 9 is more convenient to mount and dismount.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A shaft seal mechanism, comprising:
a shaft body;
the first bushing is sleeved on the outer side of the shaft body;
a through cover penetrating the outer side of the first bushing;
the second bushing is sleeved on the first bushing;
a sealing device disposed between the through cap and the second bushing;
and the check ring is arranged on the through cover and used for limiting the sealing device to be separated.
2. The shaft seal mechanism of claim 1 wherein,
one end of the first bushing is provided with a mounting interface with the second bushing; one end of the second bushing abuts against the step of the first bushing.
3. The shaft body sealing mechanism according to claim 2, wherein the second bush is tubular in shape as a whole, and an outer circumferential surface roughness value of the second bush is one of ra0.8, ra1.6, and ra 3.2; the surface hardness of the second bushing is HRC20-60; the outer diameter size of the second bushing is 0.1-0.5mm larger than the basic size, and the second bushing is in interference connection with the sealing device.
4. The shaft body sealing mechanism according to claim 1, wherein a slot hole site is arranged on the inner side of the through cover, which is close to the shaft body, and the slot hole site is an annular cavity;
the sealing device comprises:
the sealing ring body is arranged in the slot position, and one end of the sealing ring body is abutted against the inner wall of one end of the slot position;
the groove hole site is provided with a mounting groove for the retainer ring to be matched with;
the check ring is an elastic check ring and is used for being clamped in the mounting groove.
5. The shaft seal mechanism of claim 4, wherein the seal ring body comprises:
an inner ring part which is abutted against the outer wall of the second bushing, wherein a plurality of convex rings are arranged on the inner wall of the inner ring part;
an outer ring portion abutting against the inner hole wall of the through cover;
a joint portion connecting the inner ring portion and the outer ring portion at the same side end portion;
and a ring groove portion interposed between the inner ring portion and the outer ring portion and opposed to the joint portion.
6. The shaft seal mechanism of claim 5 wherein the inner diameters of the plurality of collars progressively increase or progressively decrease from the junction end to the ring groove end; the diameter of the inner ring part is 0.2-2mm smaller than the diameter of the outer circle of the second bushing.
7. The shaft seal mechanism of claim 5 wherein,
the sealing ring body is a sealing ring made of flexible wear-resistant oil-resistant materials; and/or
The sealing ring body is abutted against the inner wall of one end of the slot hole position of the through cover through the combining part.
8. The shaft seal mechanism of claim 5 wherein said ring groove section has a "V" shaped configuration with large outside and small inside.
9. A wheel set for a crane, comprising:
the shaft seal mechanism of any one of claims 1 to 8;
the shaft body is used as a wheel shaft;
the wheel body is arranged in the middle of the shaft body;
bearings arranged at two ends of the shaft body;
the bearing seat is used for supporting and mounting the bearing;
the end cover is arranged on the bearing seat and positioned at the axle end side of the wheel;
wherein,,
the through cover is arranged on the bearing seat and opposite to the end cover, one end of the first bushing is abutted against the wheel body, and the other end of the first bushing is abutted against the bearing.
10. A crane, comprising: the shaft seal mechanism of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321381231.2U CN219827485U (en) | 2023-06-01 | 2023-06-01 | Axle body sealing mechanism, wheel set for crane and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321381231.2U CN219827485U (en) | 2023-06-01 | 2023-06-01 | Axle body sealing mechanism, wheel set for crane and crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219827485U true CN219827485U (en) | 2023-10-13 |
Family
ID=88250331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321381231.2U Active CN219827485U (en) | 2023-06-01 | 2023-06-01 | Axle body sealing mechanism, wheel set for crane and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219827485U (en) |
-
2023
- 2023-06-01 CN CN202321381231.2U patent/CN219827485U/en active Active
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