CN220962826U - Novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment - Google Patents
Novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment Download PDFInfo
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- CN220962826U CN220962826U CN202322520510.9U CN202322520510U CN220962826U CN 220962826 U CN220962826 U CN 220962826U CN 202322520510 U CN202322520510 U CN 202322520510U CN 220962826 U CN220962826 U CN 220962826U
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 38
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000004020 conductor Substances 0.000 claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 19
- 239000000919 ceramic Substances 0.000 claims abstract description 13
- 239000010445 mica Substances 0.000 claims abstract description 13
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 13
- 229920000098 polyolefin Polymers 0.000 claims abstract description 13
- 230000001681 protective effect Effects 0.000 claims description 26
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 238000005253 cladding Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims 3
- 230000003712 anti-aging effect Effects 0.000 abstract description 10
- 238000001125 extrusion Methods 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 description 12
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
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- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- RJDOZRNNYVAULJ-UHFFFAOYSA-L [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] RJDOZRNNYVAULJ-UHFFFAOYSA-L 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
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- 230000008439 repair process Effects 0.000 description 1
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Abstract
The utility model discloses a novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment, which relates to the technical field of cables and comprises a cable body, wherein the cable body comprises an outer sheath layer, a tape isolating layer and a conductor, the tape isolating layer is a mica tape and is coated outside the conductor in a wrapping mode, the outer sheath layer is made of ceramic polyolefin, an anti-aging layer is arranged inside the outer sheath layer, the outer sheath layer is coated outside the anti-aging layer in an extrusion mode, a flame-retardant layer is arranged inside the anti-aging layer, an insulating layer is arranged inside the flame-retardant layer, and a metal reinforcing layer is arranged inside the insulating layer. The utility model does not affect the electrical performance of the cable so as to meet the extremely high overload resistance requirement.
Description
Technical Field
The utility model relates to the technical field of cables, in particular to a novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment.
Background
The cable is used as a connecting artery for power transmission and signal control, and plays an irreplaceable role in the normal operation of electric equipment. Once the cable fails, the equipment is stopped when the cable is light, and the fire disaster is generated when the cable is heavy, so that the property and personal safety of people are endangered, and the economic losses of different degrees are always caused.
When the mechanical equipment or the building is in actual use, the overload operation is often carried out, the circuit always has more or less overload conditions, the common cable is limited by cable materials, and when the cable is overloaded and heated to a certain degree, the insulation layer is plasticized or burnt, so that the cable is short-circuited. Once a cable fails, it is extremely difficult to replace, being limited by the complex wiring environment of the machinery or building at the time of repair replacement.
At present, the conventional cable is basically used for the electrical equipment, and overload resistance is not considered. If chinese patent publication No. CN211742700U discloses a cable for intelligent building, including cable inner core structure and cable jacket structure, cable inner core structure include copper conductor a, polyolefin insulating layer, twisted pair wire group, copper wire braid shielding layer a, no halogen low smoke flame retardant polyolefin inner sheath a, copper conductor B, double-deck synthetic mica flame retardant coating, no halogen low smoke flame retardant polyolefin inner sheath B, optic fibre, low smoke zero halogen polyethylene inner sheath, consequently need novel environmental protection fire retardant overload resistance flexible cable for electrical equipment change this current situation.
Disclosure of utility model
The utility model aims to solve the defects in the prior art, and provides a novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment. The cable has the advantages that the cable cannot be influenced on the electrical performance of the cable, so that the requirement of extremely high overload resistance can be met.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
The utility model provides a novel environment-friendly flame retardant overload-resistant flexible cable for electrical equipment, includes the cable body, the cable body includes oversheath layer, band isolation layer and conductor, the band isolation layer is the mica tape to wrap the mode cladding of package outside the conductor, the oversheath layer is made for ceramic polyolefin, the inside of oversheath layer is provided with anti-aging layer, the oversheath layer wraps outside anti-aging layer with the mode cladding of crowded package, the inside of anti-aging layer is provided with flame retardant coating, the inside of flame retardant coating is provided with the insulating layer, the inside of insulating layer is provided with the metal enhancement layer, the insulating layer is made for ceramic polyolefin, the insulating layer wraps outside the metal enhancement layer with the mode cladding of crowded package, band isolation layer and conductor all are located the inside of metal enhancement layer.
The technical scheme is as follows: the mica has extremely excellent high temperature resistance, even if the temperature reaches more than 1000 ℃, good insulation performance can be ensured, meanwhile, conductors can be effectively tightened, burrs of the conductors are prevented from piercing the insulation layer, the conductor roundness is ensured, the insulation layer can be ceramic and cannot melt and fall, the insulation layer is combined with a mica tape, the basic electrical performance of the cable under the extremely high temperature condition can be well ensured, the mica tape is adopted for wrapping, and the ceramic polyolefin insulation layer and the outer sheath layer are adopted, so that the safety performance and the flame retardant performance of the cable are greatly improved.
The utility model further provides that the conductor is composed of bare copper or tinned copper wires, and the cross section area of the conductor is 0.5-16mm 2.
The technical scheme is as follows: the optimized beam copper pitch diameter and the beam twisting process are designed to have good tensile strength and flexibility.
The utility model is further characterized in that a supporting frame is arranged in the metal reinforcing layer, the supporting frame is in a rice-shaped structure, and the outer wall of the supporting frame is contacted with the inner wall of the metal reinforcing layer.
The technical scheme is as follows: the setting of support frame can support it from the inside of metal enhancement layer, avoids the cable to be pressed and causes the condition emergence of deformation.
The utility model is further characterized in that the metal reinforcing layer is internally filled with the connecting net, and the connecting net is distributed around the tape isolating layer.
The technical scheme is as follows: the position of the tape isolating layer can be limited by the arrangement of the connecting net, so that the condition that the conductor in the tape isolating layer shakes is avoided.
The utility model is further arranged that the end part of the support frame is in an arc-shaped structure.
The technical scheme is as follows: the end part is designed into an arc-shaped structure, so that the end part of the support frame is smoother, and the support frame is prevented from wearing the metal reinforcing layer.
The cable is further characterized in that a protective sleeve is arranged outside the cable body, one end of the protective sleeve is provided with a connecting cylinder, the other end of the protective sleeve is provided with a connector, and the connector and the connecting cylinder are clamped through a clamping part.
The technical scheme is as follows: when the outdoor use of cable body, protection sleeve can protect from its outside, avoids the cable body to receive the cracked condition of pressure appearance, and protection sleeve accessible connector and connecting tube joint splice simultaneously, and the convenient cable body of different length uses.
The clamping component comprises a groove formed in the outer wall of the connector and an embedded groove formed in the connecting cylinder, a reset spring is arranged on the inner wall of the groove, an embedded block is arranged at one end, far away from the groove, of the reset spring, the embedded block is matched with the embedded groove, and one end, far away from the groove, of the embedded block is in a cambered surface design.
The technical scheme is as follows: during the concatenation, insert the connecting head in the connecting cylinder, the embedding piece can be under reset spring's effect joint to the embedded inslot, and then can accomplish the concatenation.
The utility model is further characterized in that a pressing groove is formed in the outer wall of the connecting cylinder, and the pressing groove is communicated with the embedded groove.
The technical scheme is as follows: when the protective sleeve is required to be disassembled, the embedded block can be pressed by fingers from the pressing groove, and after the embedded block is separated from the embedded groove, the connector can be pulled out from the connecting cylinder, so that the convenience of disassembly is improved.
The utility model is further characterized in that the inner wall of the protective sleeve is provided with a plurality of spacing rings which are distributed equidistantly, and the spacing rings are matched with the cable body.
The technical scheme is as follows: the setting of spacing ring can firmly fix the cable body in protective case, avoids the cable body to appear rocking the condition emergence.
The utility model further provides that the outer wall of the protective sleeve is provided with a buffer layer, and the buffer layer is made of rubber.
The technical scheme is as follows: the buffer layer can improve the compression resistance of the protective sleeve and avoid the occurrence of deformation of the protective sleeve caused by compression.
The beneficial effects of the utility model are as follows:
1. According to the novel environment-friendly flame-retardant overload-resistant flexible cable for the electrical equipment, the mica tape is wrapped on the outer layer of the conductor, so that the conductor is more round and compact, insulation or thinnest point of the sheath is effectively prevented from being thinner due to loosening or ellipse of the conductor, the high-voltage-resistant effect of the cable is affected, and meanwhile, the mica has extremely excellent high-temperature resistance; the insulation performance of the cable at high temperature is ensured; meanwhile, the ceramic polyolefin material is adopted as the insulating layer and the outer sheath layer, and the properties of the material, such as rapid ceramic without melting and dripping, are utilized to achieve excellent high temperature resistance, so that the cable is not influenced in the electrical properties when the cable is overloaded and heated, and the extremely high overload resistance requirement is met.
2. The novel environment-friendly flame-retardant overload-resistant flexible cable for the electrical equipment can be supported by the support frame from the inside of the metal reinforcing layer, so that deformation caused by compression of the cable is avoided; the connecting net can limit the position of the tape isolating layer, so that the situation that the conductor in the tape isolating layer shakes is avoided; the end part is designed into an arc-shaped structure, so that the end part of the support frame is smoother, and the support frame is prevented from wearing the metal reinforcing layer.
3. The novel environment-friendly flame-retardant overload-resistant flexible cable for the electrical equipment has the advantages that when the cable body is used in the open air, the protective sleeve can protect the cable body from the outside, the situation that the cable body is broken due to pressure is avoided, meanwhile, the protective sleeve can be spliced with the connecting cylinder through the connector in a clamping manner, and the cable bodies with different lengths are convenient to use; during splicing, the connector is inserted into the connecting cylinder, and the embedded block can be clamped into the embedded groove under the action of the reset spring, so that splicing can be completed; when the protective sleeve is required to be disassembled, the embedded block can be pressed by fingers from the pressing groove, and after the embedded block is separated from the embedded groove, the connector can be pulled out from the connecting cylinder, so that the convenience of disassembly is improved.
Drawings
FIG. 1 is a schematic perspective view of a flexible cable for a novel environment-friendly flame-retardant overload-resistant electrical device;
Fig. 2 is a schematic diagram of a cross-sectional structure of a cable body of a flexible cable for novel environment-friendly flame-retardant overload-resistant electrical equipment;
fig. 3 is a schematic diagram of a cross-sectional structure of a protective sleeve of a flexible cable for novel environment-friendly flame-retardant overload-resistant electrical equipment.
In the figure: 1. a cable body; 2. pressing the groove; 3. a buffer layer; 4. a connecting cylinder; 5. an outer sheath layer; 6. an anti-aging layer; 7. a flame retardant layer; 8. an insulating layer; 9. a metal reinforcing layer; 10. a support frame; 11. a tape isolating layer; 12. a conductor; 13. a connecting net; 14. a protective sleeve; 15. a limiting ring; 16. a connector; 17. an embedded block; 18. a groove; 19. a return spring; 20. embedded in the groove.
Detailed Description
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
Embodiments of the present patent are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the patent and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and are therefore not to be construed as limiting the patent.
In the description of this patent, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the terms in this patent will be understood by those of ordinary skill in the art as the case may be.
Referring to fig. 1-3, novel environment-friendly flame-retardant flexible cable for overload-resistant electrical equipment comprises a cable body 1, the cable body 1 comprises an outer sheath layer 5, a tape isolating layer 11 and a conductor 12, the tape isolating layer 11 is a mica tape, the conductor 12 is coated in a wrapping mode, the outer sheath layer 5 is made of ceramic polyolefin, an anti-aging layer 6 is arranged in the outer sheath layer 5, the outer sheath layer 5 is coated in an extrusion mode outside the anti-aging layer 6, a flame-retardant layer 7 is arranged in the anti-aging layer 6, an insulating layer 8 is arranged in the flame-retardant layer 7, a metal reinforcing layer 9 is arranged in the insulating layer 8, the insulating layer 8 is made of ceramic polyolefin, the insulating layer 8 is coated outside the metal reinforcing layer 9 in an extrusion mode, and the tape isolating layer 11 and the conductor 12 are both positioned in the metal reinforcing layer 9.
In this embodiment, the conductor 12 is composed of bare copper or tin-plated copper wire, and the cross-sectional area of the conductor 12 is 0.5-16mm 2. The optimized beam copper pitch diameter and the beam twisting process are designed to have good tensile strength and flexibility.
Further, a supporting frame 10 is arranged in the metal reinforcing layer 9, the supporting frame 10 is in a rice-shaped structure, and the outer wall of the supporting frame 10 is in contact with the inner wall of the metal reinforcing layer 9. The supporting frame 10 is arranged, so that the metal reinforcing layer 9 can be supported from the inside, and deformation caused by compression of the cable is avoided; the inside of the metal reinforcing layer 9 is filled with a connecting net 13, and the connecting net 13 is distributed around the tape isolating layer 11. The connecting net 13 is arranged, so that the position of the tape isolating layer 11 can be limited, and the occurrence of shaking of the conductor 12 in the tape isolating layer 11 is avoided; the end of the support frame 10 has a circular arc structure. The end part is designed in an arc-shaped structure, so that the end part of the support frame 10 is smooth, and the support frame 10 is prevented from wearing the metal reinforcing layer 9.
The outside of cable body 1 is provided with protective sleeve 14, and the one end of protective sleeve 14 is provided with connecting tube 4, and the other end of protective sleeve 14 is provided with connector 16, and connector 16 carries out the joint through joint part with connecting tube 4. When the cable body 1 is used in the open air, the protection sleeve 14 can protect the cable body 1 from the outside, so that the situation that the cable body 1 is broken due to pressure is avoided, and meanwhile, the protection sleeve 14 can be spliced with the connecting cylinder 4 through the connector 16 in a clamping manner, so that the cable bodies 1 with different lengths are convenient to use; the joint part is including seting up the recess 18 that is arranged in the connector 16 outer wall and seting up in the inside embedded groove 20 of connecting tube 4, and the inner wall of recess 18 is provided with reset spring 19, and the one end that reset spring 19 kept away from recess 18 is provided with embedded block 17, embedded block 17 and embedded groove 20 looks adaptation, and the one end that embedded block 17 kept away from recess 18 is the cambered surface design. During splicing, the connector 16 is inserted into the connecting cylinder 4, and the embedded block 17 can be clamped into the embedded groove 20 under the action of the reset spring 19, so that splicing can be completed.
It should be noted that the outer wall of the connecting cylinder 4 is provided with a pressing groove 2, and the pressing groove 2 is communicated with the embedded groove 20. When the protective sleeve 14 needs to be disassembled, the finger can extend into the pressing embedded block 17 from the pressing groove 2, and after the embedded block 17 is separated from the embedded groove 20, the connector 16 can be pulled out from the connecting cylinder 4, so that the convenience of disassembly is improved; the inner wall of the protective sleeve 14 is provided with a plurality of spacing rings 15 distributed equidistantly, and the spacing rings 15 are matched with the cable body 1. The cable body 1 can be firmly fixed in the protective sleeve 14 by the aid of the limiting ring 15, so that the cable body 1 is prevented from shaking; the outer wall of the protective sleeve 14 is provided with a buffer layer 3, and the buffer layer 3 is made of rubber. The arrangement of the buffer layer 3 can improve the compression resistance of the protection sleeve 14 and avoid the occurrence of deformation caused by the compression of the protection sleeve 14.
Working principle: the mica has extremely excellent high temperature resistance, even if the temperature reaches more than 1000 ℃, good insulation performance can be ensured, meanwhile, the conductor 12 can be effectively tightened, burrs of the conductor 12 are prevented from puncturing the insulation layer 8, the roundness of the conductor 12 is ensured, the insulation layer 8 can be ceramic and cannot melt and fall down when the ambient temperature reaches about 400 ℃, the mica tape is combined with the mica tape, the basic electrical performance of the cable under the extremely high temperature condition can be well ensured, the mica tape is adopted for wrapping, and the ceramic polyolefin insulation layer 8 and the outer sheath layer 5 are adopted, so that the safety performance and the flame retardant performance of the cable are greatly improved.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (10)
1. Novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment, comprising a cable body (1), cable body (1) includes oversheath layer (5), band isolation layer (11) and conductor (12), a serial communication port, band isolation layer (11) are mica tape to outside conductor (12) is wrapped to the mode cladding of wrapping, oversheath layer (5) are made for ceramic polyolefin, the inside of oversheath layer (5) is provided with ageing-resistant layer (6), oversheath layer (5) cladding is outside ageing-resistant layer (6) with the mode of crowded package, the inside of ageing-resistant layer (6) is provided with flame retardant layer (7), the inside of flame retardant layer (7) is provided with insulating layer (8), the inside of insulating layer (8) is provided with metal enhancement layer (9), insulating layer (8) are made for ceramic polyolefin, insulating layer (8) are wrapped outside metal enhancement layer (9) with the mode of crowded package, insulating layer (11) and conductor (12) all are located the inside of metal enhancement layer (9).
2. The novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment according to claim 1, wherein the conductor (12) is composed of bare copper or tinned copper wires, and the cross-sectional area of the conductor (12) is 0.5-16mm 2.
3. The flexible cable for the novel environment-friendly flame-retardant overload-resistant electrical equipment according to claim 1, wherein a supporting frame (10) is arranged in the metal reinforcing layer (9), the supporting frame (10) is in a rice-shaped structure, and the outer wall of the supporting frame (10) is in contact with the inner wall of the metal reinforcing layer (9).
4. The novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment according to claim 3, wherein the metal reinforcing layer (9) is internally filled with a connecting net (13), and the connecting net (13) is distributed around the tape isolating layer (11).
5. A novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment according to claim 3, characterized in that the end of the supporting frame (10) is in a circular arc structure.
6. The flexible cable for the novel environment-friendly flame-retardant overload-resistant electrical equipment according to claim 1, wherein a protective sleeve (14) is arranged outside the cable body (1), one end of the protective sleeve (14) is provided with a connecting cylinder (4), the other end of the protective sleeve (14) is provided with a connector (16), and the connector (16) and the connecting cylinder (4) are clamped through clamping components.
7. The novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment according to claim 6, wherein the clamping component comprises a groove (18) formed in the outer wall of the connector (16) and an embedded groove (20) formed in the connecting cylinder (4), a reset spring (19) is arranged on the inner wall of the groove (18), an embedded block (17) is arranged at one end, far away from the groove (18), of the reset spring (19), the embedded block (17) is matched with the embedded groove (20), and one end, far away from the groove (18), of the embedded block (17) is in a cambered surface design.
8. The flexible cable for the novel environment-friendly flame-retardant overload-resistant electrical equipment according to claim 7, wherein the outer wall of the connecting cylinder (4) is provided with a pressing groove (2), and the pressing groove (2) is communicated with the embedded groove (20).
9. The novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment according to claim 8, wherein a plurality of spacing rings (15) distributed at equal intervals are arranged on the inner wall of the protective sleeve (14), and the spacing rings (15) are matched with the cable body (1).
10. The novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment according to claim 9, wherein a buffer layer (3) is arranged on the outer wall of the protective sleeve (14), and the buffer layer (3) is made of rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322520510.9U CN220962826U (en) | 2023-09-18 | 2023-09-18 | Novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322520510.9U CN220962826U (en) | 2023-09-18 | 2023-09-18 | Novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220962826U true CN220962826U (en) | 2024-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322520510.9U Active CN220962826U (en) | 2023-09-18 | 2023-09-18 | Novel environment-friendly flame-retardant overload-resistant flexible cable for electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220962826U (en) |
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2023
- 2023-09-18 CN CN202322520510.9U patent/CN220962826U/en active Active
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