CN217467268U - Shell structure of optical cable joint box and optical cable joint box - Google Patents
Shell structure of optical cable joint box and optical cable joint box Download PDFInfo
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- CN217467268U CN217467268U CN202220407843.3U CN202220407843U CN217467268U CN 217467268 U CN217467268 U CN 217467268U CN 202220407843 U CN202220407843 U CN 202220407843U CN 217467268 U CN217467268 U CN 217467268U
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Abstract
The utility model provides a shell structure and optical cable joint box of optical cable joint box. The shell structure of the cable joint box comprises: a box body; a base; the lantern ring is sleeved on the box body, and the box body is positioned between the lantern ring and the base; the connecting structure is positioned on the peripheral side of the box body, and the lantern ring is connected with the base through the connecting structure so as to fix the box body on the base. The technical scheme of the utility model in, fix the box body on the base through the lantern ring, the box body atress is even, stable, non-deformable.
Description
Technical Field
The utility model relates to an optical cable joint box technical field particularly, relates to an optical cable joint box's shell structure and optical cable joint box.
Background
The shell structure of the optical cable joint box comprises a box body, a base and a connecting piece between the box body and the base. The current more common mode of connecting box body and base in the industry is: the bolt hole position is left at the edge of box body, is connected the box body with the base with the bolt and fixes, and this kind of mode is connected stably, nevertheless because the box body edge be used for with the wall thickness of bolted connection fixed position department with the box body the same relatively thin, lead to the easy problem that causes the deformation because of the atress inequality at the box body edge.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides an optical cable joint box's shell structure and optical cable joint box fixes the box body on the base through the lantern ring, and the box body atress is even, stable, non-deformable.
In order to achieve the above object, according to an aspect of the present invention, there is provided a housing structure of an optical cable junction box, including: a box body; a base; the lantern ring is sleeved on the box body, and the box body is positioned between the lantern ring and the base; the connecting structure is positioned on the peripheral side of the box body, and the lantern ring is connected with the base through the connecting structure so as to fix the box body on the base.
Further, the connection structure includes: the at least two first mounting holes are sequentially arranged on the lantern ring at intervals along the circumferential direction of the lantern ring; the at least two second mounting holes are arranged on the base at intervals and are arranged corresponding to the at least two first mounting holes; at least two retaining members correspond the setting with two at least first mounting holes, and the one end of retaining member is passed behind the first mounting hole and is connected with the second mounting hole.
Furthermore, at least one first hanging lug is arranged on the lantern ring, and each first hanging lug is provided with at least one first mounting hole; and/or the base is provided with at least one second hanging lug, and each second hanging lug is provided with at least one second mounting hole.
Further, the shell structure of the optical cable joint box further comprises a sealing element, a groove is formed in the base, the sealing element is installed in the groove, and the sealing element is located between the base and the box body so as to seal a gap between the base and the box body.
Furthermore, the box body comprises a box body and a ring segment connected with the box body, an opening is formed in the box body, and the ring segment is located at the opening and arranged on the periphery of the opening; the sealing element is positioned between the base and the ring segment, and the lantern ring is abutted to the ring segment.
Furthermore, a first wall surface and a second wall surface are arranged on the base, the height of the first wall surface is larger than that of the second wall surface, a step surface is formed by the first wall surface and the second wall surface, and the groove is formed in the first wall surface.
Furthermore, the box body also comprises a bending section connected with the ring section, the bending section is positioned on one side of the ring section, which is far away from the box body, and the bending section bends towards the second wall surface.
Furthermore, a first wall surface and a protrusion are arranged on the base, a limiting space is defined by the lantern ring, at least part of the first wall surface and the protrusion together, and at least part of the box body is located in the limiting space.
Further, the sealing element is a sealing ring, and the groove is an annular groove.
According to the utility model discloses an on the other hand provides an optical cable joint box, including the optical cable, melt fine dish and foretell optical cable joint box's shell structure, melt fine dish setting in optical cable joint box's shell structure, be equipped with the through-hole on the base, the one end of optical cable is passed after the through-hole and is connected with melting fine dish.
Use the technical scheme of the utility model, the lantern ring is connected with the base, and the lantern ring cover is established on the box body, and the box body is located between the lantern ring and the base, like this, can compress tightly the box body through the lantern ring and fix on the base, and the lantern ring is more even, stable to the box body application of force. Realize being connected between the lantern ring and the base through connection structure, and connection structure is located the periphery side of box body, can utilize the cooperation of being connected between the lantern ring and the base to form the fixed action like this, do not pass through under the condition of box body at connection structure, fix the position between box body and the base, avoid punching on the box body and destroy the box body structure, also can avoid the bolt directly at box body edge fastening, lead to the problem of box body atress inequality, yielding. The utility model discloses an in the embodiment, add the lantern ring outside the box body, the lantern ring passes through connection structure with the base and is connected, realizes the fixed cooperation between box body and the base, utilizes the loop configuration of the lantern ring to apply circumference effort to the box body for fixed knot between box body and the base constructs more reliable and more stable, and the box body atress is more even, stable, non-deformable.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic perspective view of an embodiment of a housing structure of a cable closure according to the present invention; and
fig. 2 shows a partial cross-sectional view of the housing structure of the cable closure of fig. 1.
Wherein the figures include the following reference numerals:
10. a box body; 11. a cartridge body; 12. a ring segment; 13. an opening; 14. bending the section; 20. a base; 21. a second mounting hole; 22. a second suspension loop; 23. a groove; 24. a step surface; 241. a first wall surface; 242. a second wall surface; 25. a protrusion; 30. a collar; 31. a first mounting hole; 32. a first suspension loop; 40. a connecting structure; 41. a locking member; 50. a seal member; 60. and (4) limiting the space.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It is to be noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
The OPGW (Optical fiber Composite Overhead Ground Wire) splice closure generally adopts a cap type structure, and includes a housing structure, an internal component, and the like, where the housing structure includes a box body, a base, and a connecting member therebetween.
In the prior art, the compression between the box body and the base is generally realized by adopting steel belt fastening, when the box body is fixed by adopting a stainless steel belt and is continuously packaged on site, the stainless steel belt is easy to twist and rotate, so that the site fastening process is difficult to control, and the sealing quality of the joint box can be directly influenced. Base, box body and sealing washer form triangle-shaped seal structure when sealed, because box body edge machining precision is not enough with reasons such as manual operation, rubber circle compression ratio control is accurate inadequately. When the compression ratio of the rubber ring is too high, the rubber ring can generate permanent deformation and lose the sealing performance; when the compression ratio of the rubber ring is too small, the sealing effect is poor, and the sealing effect is also influenced. The sealing washer is extruded and is produced the deformation after the stainless steel band fastening, because do not draw close completely between base and the box body lower limb, the sealing washer is extruded from between base and box body, and exposed sealing washer can be ageing with higher speed, influences sealed effect.
Because there is certain defect and the inconvenient problem of construction, there has been the splice box of the fixed box body of cancellation steel band in the trade at present, and leave bolt hole position at the edge of box body, it is fixed with box body and base connection with the bolt, in this mode, though connect more stably, but because the box body edge is used for being thin relatively with the wall thickness of the box body with the wall thickness of the fixed position department of bolted connection is the same, lead to the easy problem that causes the deformation because of the atress inequality of box body edge, and then lead to on same circumference, the box body is unstable to the pressure that is used for the sealing washer in clearance between sealed box body and the base, the relatively poor problem of sealed effect.
As shown in fig. 1 and fig. 2, in the embodiment of the present invention, the housing structure of the optical cable connector box includes a box body 10, a base 20, a sleeve ring 30 and a connecting structure 40, the sleeve ring 30 is sleeved on the box body 10, and the box body 10 is located between the sleeve ring 30 and the base 20; the connection structure 40 is located at the outer peripheral side of the case 10, and the collar 30 is connected to the base 20 through the connection structure 40 to fix the case 10 on the base 20.
In the above arrangement, the sleeve ring 30 is connected with the base 20, the sleeve ring 30 is sleeved on the box body 10, and the box body 10 is located between the sleeve ring 30 and the base 20, so that the box body 10 can be pressed and fixed on the base 20 through the sleeve ring 30, and the sleeve ring 30 applies force to the box body 10 more uniformly and stably. Realize being connected between the lantern ring 30 and the base 20 through connection structure 40, and connection structure 40 is located the periphery side of box body 10, can utilize the cooperation of being connected between the lantern ring 30 and the base 20 to form the fixed action like this, do not pass through under the condition of box body 10 at connection structure 40, fix the position between box body 10 and the base 20, avoid punching on box body 10 and destroy box body 10 structure, also can avoid directly fastening at the box body edge because of the bolt, lead to the box body atress uneven, yielding problem. The embodiment of the utility model provides an in, add the lantern ring 30 outside box body 10, the lantern ring 30 passes through connection structure 40 with base 20 and is connected, realizes fixed cooperation between box body 10 and the base 20, utilizes the loop configuration of lantern ring 30 to exert circumference effort to box body 10 for fixed knot between box body 10 and the base 20 constructs more reliable and more stable, and the box body atress is more even, stable, non-deformable.
As shown in fig. 1 and 2, in the embodiment of the present invention, the connection structure 40 includes at least two first mounting holes 31, at least two second mounting holes 21, and at least two locking members 41, the at least two first mounting holes 31 are sequentially disposed on the collar 30 at intervals along the circumferential direction of the collar 30; the at least two second mounting holes 21 are arranged on the base 20 at intervals, and the at least two second mounting holes 21 are arranged corresponding to the at least two first mounting holes 31; at least two retaining members 41 are arranged corresponding to at least two first mounting holes 31, and one end of the retaining member 41 passes through the first mounting hole 31 and then is connected with the second mounting hole 21.
In the above arrangement, one end of the locking member 41 passes through the first mounting hole 31 and then is connected with the second mounting hole 21, and the collar 30 is connected with the base 20 through the locking member 41, so that the structure is simple and the operation is convenient. The number of the first mounting holes 31, the second mounting holes 21 and the locking members 41 is at least two, so that the connection between the collar 30 and the base 20 can be more stable and reliable. Set up two at least first mounting holes 31 along lantern ring 30's circumference interval in proper order to make second mounting hole 21 correspond the setting with first mounting hole 31, retaining member 41 corresponds the setting with first mounting hole 31, set up like this and to make lantern ring 30 more even to box body 10 application of force, thereby make box body 10 atress more even, non-deformable.
As shown in fig. 1, in the embodiment of the present invention, the number of the first mounting holes 31, the second mounting holes 21 and the locking members 41 is four, and the four first mounting holes 31 are sequentially and uniformly spaced along the circumference of the collar 30.
The embodiment of the utility model provides an in, retaining member 41 is the bolt, and second mounting hole 21 is the screw hole, and the one end of bolt passes behind first mounting hole 31 with second mounting hole 21 threaded connection. The base 20 and the lantern ring 30 are connected through the bolt in a fastening mode, connection between the box body 10 and the base 20 is achieved, and the problem that manual work is difficult to control when the box body is fixed through a steel belt is solved.
Of course, in an alternative embodiment of the present application, the connecting structure 40 may further include at least two anti-dropping members (e.g., nuts) according to actual requirements, and one end of the locking member 41 passes through the first mounting hole 31 and the second mounting hole 21 and then is connected to the anti-dropping members, so as to achieve the purpose of connecting the fixing base 20 and the collar 30.
As shown in fig. 1 and fig. 2, in the embodiment of the present invention, at least one first hanging lug 32 is disposed on the lantern ring 30, and at least one first mounting hole 31 is disposed on each first hanging lug 32.
By providing the first hanging lugs 32, the first mounting holes 31 can be easily arranged, thereby achieving the purpose of positioning the connecting structure 40 on the outer peripheral side of the collar 30.
As shown in fig. 1 and fig. 2, in the embodiment of the present invention, at least one second hanging lug 22 is disposed on the base 20, and at least one second mounting hole 21 is disposed on each second hanging lug 22.
By providing the second hanging lugs 22, the second mounting holes 21 can be easily arranged, thereby achieving the purpose of locating the connecting structure 40 on the outer peripheral side of the collar 30.
As shown in fig. 1 and fig. 2, in the embodiment of the present invention, four first hangers 32 are uniformly arranged on the outer peripheral side of the lantern ring 30 at intervals, each first hanger 32 is provided with a first mounting hole 31, and the first mounting hole 31 is a through hole; correspondingly, four second hanging lugs 22 are arranged on the outer peripheral side of the base 20 at intervals, each second hanging lug 22 is provided with a second mounting hole 21, and the second mounting holes 21 are threaded holes. One end of the locking member 41 is threaded into the second mounting hole 21 after passing through the first mounting hole 31, and a part of the structure of the case 10 is fixed between the base 20 and the collar 30, thereby achieving the purpose of fixing the case 10 to the base 20.
As shown in fig. 2, in the embodiment of the present invention, the housing structure of the optical cable splice closure further includes a sealing element 50, a groove 23 is formed on the base 20, the sealing element 50 is installed in the groove 23, and the sealing element 50 is located between the base 20 and the box body 10 to seal a gap between the base 20 and the box body 10.
In the above arrangement, the sealing member 50 is used to seal the gap between the base 20 and the case 10. The base 20 is provided with a groove 23, and a sealing member 50 is disposed in the groove 23 to seal a gap between the base 20 and the casing 10.
In the embodiment of the present invention, the sealing member 50 is a sealing ring, and the groove 23 is an annular groove. By the arrangement, 360-degree sealing can be realized, and the sealing effect is good.
The embodiment of the utility model provides an in, the sealed groove seal mode that adopts between base 20 and the box body 10, compare in traditional triangle limit seal mode, the volume of compression of groove seal mode effective control sealing washer prevents that the sealing washer extrusion is impaired or sealed bad, and the groove seal mode sealing washer does not expose, has prolonged life, realizes more permanent sealed.
The embodiment of the utility model provides an in, lantern ring 30 compresses tightly box body 10 and fixes on base 20, and lantern ring 30 is more even, stable to the box body 10 application of force to make the atress between box body 10 and the sealing washer more even stable, can improve sealed effect.
As shown in fig. 2, in the embodiment of the present invention, the box body 10 includes a box body 11 and a ring segment 12 connected to the box body 11, an opening 13 is provided on the box body 11, and the ring segment 12 is located at the opening 13 and is disposed at the periphery of the opening 13; the seal 50 is located between the base 20 and the ring segment 12, and the collar 30 abuts the ring segment 12.
In the above arrangement, the ring segment 12 is located at the periphery of the opening 13 on the box body 11, and the collar 30 abuts against the ring segment 12 on the base 20, so as to achieve the purpose of pressing and fixing the box body 10 on the base 20 through the collar 30. The seal 50 is used to seal the gap between the base 20 and the ring segment 12. By providing the ring segments 12, the collar 30 facilitates securing the cartridge body 10.
In the embodiment of the present invention, the box body 10 is formed by an aluminum thin plate.
In the embodiment of the present invention, the position of the box body 10 contacting with the sealing ring is a plane, that is, the position of the ring segment 12 contacting with the sealing ring is a plane, so that the sealing performance can be ensured.
The embodiment of the utility model provides an in, box body 10 embolias lantern ring 30, and lantern ring 30 is connected with base 20 through the bolt, and box body edge (being ring section 12) and lantern ring 30 plane contact prevent that sealed face warp, and first hangers 32 is thicker on the lantern ring 30, can produce stable packing force to box body 10 after the bolt fastening.
As shown in fig. 2, in the embodiment of the present invention, the base 20 is provided with a first wall 241 and a second wall 242, the height of the first wall 241 is greater than the height of the second wall 242, the first wall 241 and the second wall 242 form a step surface 24, and the groove 23 is disposed on the first wall 241.
In the above arrangement, the groove 23 is provided on the first wall surface 241, and when the housing structure of the cable closure is assembled, the sealing member 50 is placed in the groove 23, since the first wall surface 241 and the second wall surface 242 form the step surface 24, and the first wall surface 241 is located above the second wall surface 242, moisture at the second wall surface 242 is difficult to enter the groove 23, that is, with the above arrangement, water entering the groove 23 can be reduced, thereby reducing the aging of the sealing member 50.
As shown in fig. 2, in the embodiment of the present invention, the box body 10 further includes a bending section 14 connected to the ring segment 12, the bending section 14 is located on one side of the ring segment 12 away from the box body 11, and the bending section 14 is bent toward the second wall 242.
By providing the bend 14, water ingress into the groove 23 during use is reduced, thereby reducing degradation of the seal 50.
As shown in fig. 2, in the embodiment of the present invention, the base 20 is provided with a first wall 241 and a protrusion 25, the collar 30, at least a portion of the first wall 241 and the protrusion 25 together form a limiting space 60, and at least a portion of the box body 11 is located in the limiting space 60. The limiting space 60 is used for limiting the movement of the cartridge body 11 in the first direction with respect to the base 20.
In the above arrangement, the limiting space 60 can limit the movement of the box body 11 relative to the base 20 along the first direction, so as to prevent the box body 11 from moving relative to the base 20 along the first direction, and ensure the fixing effect of the collar 30 on the box body 10 and the sealing effect between the base 20 and the ring segment 12.
As shown in fig. 2, in the embodiment of the present invention, the protrusion 25, the first wall 241 and the second wall 242 are sequentially disposed.
The embodiment of the utility model provides an in, optical cable joint box includes the optical cable, melts fine dish and foretell optical cable joint box's shell structure, melts fine dish setting in optical cable joint box's shell structure, is equipped with the through-hole on base 20, and the one end of optical cable is passed after the through-hole and is connected with melting fine dish.
In the arrangement, the shell structure of the optical cable joint box has the installation and protection effects on the fiber melting disc and the optical cable.
It should be noted that, because the optical cable joint box of this application includes the shell structure of the optical cable joint box of this application, consequently, the optical cable joint box of this application also has the above-mentioned advantage of the shell structure of the optical cable joint box of this application, and this no longer gives details here.
The embodiment of the utility model provides an in, the optical cable splice box is OPGW splice box, can be used to the effect of continuing of the compound overhead earth wire of overhead transmission line optic fibre (OPGW) at the optic fibre of strain insulator tower department.
From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the lantern ring is connected with the base, and the lantern ring cover is established on the box body, and the box body is located between the lantern ring and the base, like this, can compress tightly the box body through the lantern ring and fix on the base, and the lantern ring is more even, stable to the box body application of force. Realize being connected between the lantern ring and the base through connection structure, and connection structure is located the periphery side of box body, can utilize the cooperation of being connected between the lantern ring and the base to form the fixed action like this, do not pass through under the condition of box body at connection structure, fix the position between box body and the base, avoid punching on the box body and destroy the box body structure, also can avoid the bolt directly at box body edge fastening, lead to the problem of box body atress inequality, yielding. The utility model discloses an in the embodiment, add the lantern ring outside the box body, the lantern ring passes through connection structure with the base and is connected, realizes fixed cooperation between box body and the base, utilizes the loop configuration of the lantern ring to apply circumference effort to the box body for fixed knot between box body and the base constructs more reliable and more stable, and the box body atress is more even, stable, non-deformable.
It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A housing construction for a cable closure, comprising:
a case (10);
a base (20);
the sleeve ring (30) is sleeved on the box body (10), and the box body (10) is positioned between the sleeve ring (30) and the base (20);
the connecting structure (40) is positioned on the outer periphery side of the box body (10), and the sleeve ring (30) is connected with the base (20) through the connecting structure (40) so as to fix the box body (10) on the base (20).
2. The cable closure housing structure according to claim 1, wherein the connection structure (40) comprises:
at least two first mounting holes (31) which are sequentially arranged on the lantern ring (30) at intervals along the circumferential direction of the lantern ring (30);
at least two second mounting holes (21) are arranged on the base (20) at intervals, and the at least two second mounting holes (21) are arranged corresponding to the at least two first mounting holes (31);
at least two retaining members (41), with at least two first mounting hole (31) correspond the setting, the one end of retaining member (41) is passed behind first mounting hole (31) with second mounting hole (21) are connected.
3. The housing structure of a cable closure according to claim 2,
at least one first hanging lug (32) is arranged on the lantern ring (30), and at least one first mounting hole (31) is formed in each first hanging lug (32); and/or the presence of a gas in the gas,
the base (20) is provided with at least one second hanging lug (22), and each second hanging lug (22) is provided with at least one second mounting hole (21).
4. The cable closure housing structure according to any one of claims 1 to 3, further comprising a sealing member (50), wherein the base (20) is provided with a groove (23), the sealing member (50) is mounted in the groove (23), and the sealing member (50) is located between the base (20) and the box body (10) to seal a gap between the base (20) and the box body (10).
5. The cable closure shell structure according to claim 4, wherein the box body (10) comprises a box body (11) and a ring segment (12) connected with the box body (11), an opening (13) is arranged on the box body (11), and the ring segment (12) is located at the opening (13) and arranged at the periphery of the opening (13); the sealing element (50) is located between the base (20) and the ring segment (12), and the collar (30) abuts against the ring segment (12).
6. The housing structure of the cable closure according to claim 5, wherein the base (20) is provided with a first wall surface (241) and a second wall surface (242), the first wall surface (241) has a height greater than that of the second wall surface (242), the first wall surface (241) and the second wall surface (242) form a stepped surface (24), and the recess (23) is provided on the first wall surface (241).
7. The cable closure shell structure according to claim 6, wherein the box body (10) further comprises a bending section (14) connected to the ring section (12), the bending section (14) is located on a side of the ring section (12) far away from the box body (11), and the bending section (14) is bent towards the second wall surface (242).
8. The cable closure housing structure according to claim 5, wherein the base (20) is provided with a first wall (241) and a protrusion (25), the collar (30), at least a portion of the first wall (241) and the protrusion (25) together define a space (60), and at least a portion of the closure body (11) is located in the space (60).
9. The cable closure housing arrangement according to claim 4, wherein the sealing member (50) is a sealing ring and the groove (23) is an annular groove.
10. A cable closure comprising a cable, a splice tray and a housing structure of the cable closure according to any one of claims 1 to 9, wherein the splice tray is disposed within the housing structure of the cable closure, and a through hole is provided in a base (20), and an end of the cable is connected to the splice tray after passing through the through hole.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202220407843.3U CN217467268U (en) | 2022-02-24 | 2022-02-24 | Shell structure of optical cable joint box and optical cable joint box |
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Application Number | Priority Date | Filing Date | Title |
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CN202220407843.3U CN217467268U (en) | 2022-02-24 | 2022-02-24 | Shell structure of optical cable joint box and optical cable joint box |
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CN217467268U true CN217467268U (en) | 2022-09-20 |
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CN202220407843.3U Active CN217467268U (en) | 2022-02-24 | 2022-02-24 | Shell structure of optical cable joint box and optical cable joint box |
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