Electric connector assembly and communication equipment

Abstract

The invention discloses an electric connector assembly and communication equipment. The electric connector assembly comprises a terminal module; the shielding cage is provided with a top plate, a bottom plate, a left side plate, a right side plate and a rear end plate which are combined with one another and jointly define a butt joint cavity, an opening is formed in the front end of the butt joint cavity, and the terminal module group is arranged in the shielding cage; the first extension plate is formed by further extending the front end edge of the left side plate forwards; the second extension plate is formed by further extending the front end edge of the right side plate forwards; the upper cover plate is correspondingly and fixedly connected with the upper edge of the first extension plate, the upper edge of the second extension plate and the front end position of the top plate; the lower cover plate is correspondingly and fixedly connected with the lower edge of the first extension plate, the lower edge of the second extension plate and the front end position of the bottom plate; the front end edge of the upper plate body, the front end edge of the upper side plate part, the front end edge of the first extension plate, the front end edge of the second extension plate and the front end edge of the lower cover plate are jointly combined to form a butt joint opening, and the plane where the butt joint opening is located inclines in the front-back direction.

Description

Technical Field

[0001] The present application relates to an electrical connector assembly and a communication device. Background Art

[0002] A common challenge facing electrical system developers is heat management. Heat generated by electronic components within a system can degrade performance and even damage system components, such as electrical connectors. Electrical connectors are used to transmit data and / or power between different systems or devices. Data signals can be transmitted optically and / or electrically via communication cables. Examples include IC connectors (e.g., PGA), I / O connectors (e.g., DisplayPort, VGA, DVI, HDMI, USB), fiber optic connectors (e.g., FC, SC, ST, LC, D4, DIN, MU, MT), optical communication connectors (e.g., SFP, QSFP, OSFP), filter connectors, CATV connectors, backplane connectors, memory connectors (e.g., DDR, SIMM, DIMM, PCI, SIM), HDTV connectors (e.g., RF coaxial connectors), flexible printed circuit connectors (e.g., FPC, FFC), network cable connectors (e.g., RJ45), audio and video (AV) connectors, battery connectors, and more.

[0003] In actual use, due to functional requirements, multiple electrical connectors are often densely arranged within a device body. However, the space reserved for the densely arranged multiple electrical connectors is limited. As the power of the electrical connectors continues to increase, a large amount of heat is generated. The heat is more concentrated between the electrical connectors, which is not conducive to heat dissipation. On the other hand, the densely arranged multiple electrical connectors are not conducive to plugging and unplugging with the docking connector module (such as the optical module handle). In addition, in some special cases, the external space reserved for the docking connector module will also be limited. Summary of the Invention

[0004] The purpose of the present application is to provide an electrical connector assembly and communication equipment, wherein the electrical connector assembly is suitable for multiple densely arranged arrangements and can facilitate heat dissipation.

[0005] To achieve the above objectives, this application provides the following technical solutions: An electrical connector assembly, comprising: A terminal module is formed with an insulating body and a plurality of terminal pieces fixed to the insulating body; The shielding cage is formed with a top plate, a bottom plate arranged opposite to the top plate in the vertical direction, a left side plate connecting one side of the top plate and the bottom plate, a right side plate connecting the other side of the top plate and the bottom plate and arranged opposite to the left side plate, and a rear end plate connected to the rear ends of the left and right sides of the left plate; The top plate, bottom plate, left plate, right plate and rear plate are collectively arranged to form a docking cavity and an opening is formed at the front end. A mounting opening is formed between the rear end edge of the bottom plate or the rear end edge of the top plate and the rear end plate. The terminal module is assembled in the shielding cage through the mounting opening. A first extension plate is formed by further extending the front end edge of the left side plate forward; A second extension plate is formed by further extending the front end edge of the right side plate forward; The upper cover plate includes an upper plate body, an upper connecting plate formed by extending downward from the rear end edge of the upper plate body, an upper fixing plate formed by extending backward from the rear end edge of the upper connecting plate, and two upper side plate portions provided on both side edges of the upper cover plate and extending downward, wherein the lower edges of the two upper side plate portions are respectively fixedly connected to the upper edge of the first extension plate and the upper edge of the second extension plate, and the upper fixing plate is fixedly connected to the front end position of the top plate; A lower cover plate, wherein both side edges of the lower cover plate are fixedly connected to the lower edge of the first extension plate and the lower edge of the second extension plate respectively, and the rear end of the lower cover plate is fixedly connected to the front end of the bottom plate; The front end edge of the upper plate body, the front end edge of the upper side plate, the front end edge of the first extension plate, the front end edge of the second extension plate, and the front end edge of the lower cover plate are combined to form a docking interface, and the plane where the docking interface is located is inclined along the front-to-back direction.

[0006] Furthermore, the lower edge of the upper side plate portion is fixed to the upper edge of the first extension plate through a dovetail groove structure to form a joining seam; it also includes an external elastic piece, which is fitted and fixed to the outer surface of the upper side plate portion and the outer surface of the first extension plate, and the external elastic piece at least covers part of the joining seam.

[0007] Furthermore, the lower cover plate includes a lower plate body, a lower connecting plate formed by extending upward from the rear end edge of the lower plate body, a lower fixed plate formed by extending backward from the rear end edge of the lower connecting plate, and two lower side plate portions arranged on both side edges of the lower plate body and extending upward, the lower edges of the two lower side plate portions are respectively fixedly connected to the upper edge of the first extension plate and the upper edge of the second extension plate, and the lower fixed plate is fixedly connected to the front end position of the base plate.

[0008] Furthermore, a plurality of through holes are formed on the upper connecting plate in the front-to-back direction.

[0009] Furthermore, a convex portion is formed on the top plate at a position close to the front end and protrudes upwards, and the upper fixing plate is attached to the outer surface of the front end of the top plate and stops at the convex portion backwards.

[0010] Furthermore, a cantilevered elastic arm is formed on the bottom plate near the front end, and machining gaps are formed on both sides of the elastic arm. The elastic arm includes a portion inclined toward the docking cavity. A clearance opening is formed on the lower cover plate and corresponds to the elastic arm, and the clearance opening is used to allow elastic deformation of the elastic arm.

[0011] Furthermore, the clearance opening includes a portion formed on the lower fixing plate and a portion extending from the lower connecting plate, and the clearance opening divides the lower fixing plate into two parts along the left-right direction.

[0012] Furthermore, it also includes: an upper heat dissipation module assembled on the top plate, a front end edge of the upper heat dissipation module is formed with a limiting portion, and the limiting portion is formed above the upper fixing plate.

[0013] Furthermore, the upper heat dissipation module extends along the front-to-back direction to form a plurality of air flow channels arranged along the left-to-right direction, and the through holes formed on the upper connecting plate of the upper cover plate are correspondingly connected to the air flow channels along the front-to-back direction.

[0014] To achieve the above objectives, this application also provides the following technical solutions: A communication device comprises a plurality of electrical connector assemblies as described above, and also comprises an equipment case, wherein the plurality of electrical connector assemblies are arranged inside the equipment case along a first direction, and the docking port of each electrical connector assembly passes through an end face of the equipment case and is exposed outwardly, and the plane on which the docking port is located is parallel or flush with the plane on which the end face is located.

[0015] Compared with the prior art, the beneficial effects of the present application are: the electrical connector assembly is suitable for multiple densely arranged arrangements and can facilitate heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the communication device of the present application.

[0017] Figure 2 This is a top view of the communication device of the present application with the upper cover removed.

[0018] Figure 3 It is a three-dimensional schematic diagram of multiple electrical connector components arranged in the communication device of the present application.

[0019] Figure 4 It is a three-dimensional schematic diagram of the electrical connector assembly of the present application, specifically showing a three-dimensional schematic diagram of the electrical connector assembly docking with a schematic optical module plug.

[0020] Figure 5 It is a three-dimensional schematic diagram of the electrical connector assembly of the present application, specifically, without inserting the optical module plug.

[0021] Figure 6 This is a partial exploded view of the electrical connector assembly of the present application, with a viewing angle of Figure 5 same.

[0022] Figure 7 This is a partial exploded view of the electrical connector assembly of the present application, with a viewing angle of Figure 5 different.

[0023] Figure 8 yes Figure 5 The electrical connector assembly is shown as a three-dimensional schematic diagram from another angle.

[0024] Figure 9 This is a partial exploded view of the electrical connector assembly of the present application, with a viewing angle of Figure 5 different.

[0025] Figure 10 yes Figure 9 A further exploded perspective view of the electrical connector assembly is shown.

[0026] Figure 11 It is from Figure 5 Sectional view along line AA.

[0027] Figure 12 yes Figure 11 Enlarged view of the structure within the dashed box. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In this application, all directions involved should be referred to as Figure 4 For reference, the X-axis is defined as the left-right direction, with the positive direction of the X-axis being right; the Y-axis is defined as the up-down direction, with the positive direction of the Y-axis being up; and the Z-axis is defined as the front-back direction, with the positive direction of the Z-axis being back.

[0030] Please refer to Figure 1 and Figure 2As shown in FIG. 1 , a communication device disclosed in the present application can be, for example, a module in a communication base station. The communication device includes a device housing 4 and a plurality of electrical connector assemblies 100 assembled in the device housing 4. A row of multiple mounting holes (not numbered) are formed on one end face 41 of the device housing 4. The plurality of electrical connector assemblies 100 are arranged obliquely in the device housing 4, with the docking port 10 of each electrical connector assembly 100 exposed to the outside of the device housing 4 through the mounting hole. Each electrical connector assembly 100 is used to connect to an external optical module plug 200 ( Figure 4 In a preferred embodiment, the plane where the docking port 10 is located is parallel to or flush with the plane where the end face 41 is located.

[0031] Please refer to Figures 3 to 12 As shown, the electrical connector assembly 100 includes a terminal module 1 and a shielding cage 2 that mates with the terminal module 1. The terminal module 1 comprises an insulating body 11 and a plurality of terminal members 12 secured to the insulating body 11. An insertion opening (unnumbered) is formed at the front end of the insulating body 11. Each terminal member 12 comprises a fixing section (not shown, unnumbered) secured to the insulating body 11, a resilient contact section (unnumbered) extending into the insertion opening, and a docking section (not shown, unnumbered) extending downward from the lower surface of the insulating body 11 and configured to electrically connect and secure the insulating body 11 to the circuit substrate 300.

[0032] Furthermore, the shielding cage 2 includes a top plate 21, a bottom plate 22 vertically opposed to the top plate 21, a left side plate 23 connecting one side of the top plate 21 and the bottom plate 22, a right side plate 24 connecting the other side of the top plate 21 and the bottom plate 22 and opposed to the left side plate 23, and a rear end plate 25 coupled to the rear ends of the top plate 21, the left side plate 23, and the right side plate 24. The top plate 21, the bottom plate 22, the left side plate 23, the right side plate 24, and the rear end plate 25 collectively enclose a docking cavity (unnumbered) with an opening at the front end. A mounting opening 202 is formed between the rear end edge of the bottom plate 22 and the rear end plate 25. The terminal module 1 is assembled within the shielding cage 2 through the mounting opening 202. The insertion opening of the terminal module 1 communicates forwardly with the docking cavity. In other embodiments, the installation opening 202 may also be formed between the rear end edge of the top plate 21 and the rear end plate 25 . In other words, the top plate 21 and the bottom plate 22 are relative.

[0033] Please refer to Figures 4 to 12As shown, the front edge of the left side panel 23 further extends forward to form a first extension panel 231. The front edge of the right side panel 24 further extends forward to form a second extension panel 241. The first extension panel 231 and the second extension panel 241 have different lengths in the front-to-back direction. In the illustrated embodiment of this application, the first extension panel 231 is longer than the second extension panel 241. Alternatively, the second extension panel 241 may be longer than the first extension panel 231, depending on the tilting direction of the electrical connector assembly when assembled into the equipment case 4. The shielding cage 2 also includes an upper cover 26, which includes an upper plate body 261, an upper connecting plate 262 extending downward from the rear end of the upper plate body 261, an upper fixing plate 263 extending rearward from the rear end of the upper connecting plate 262, and two upper side panels 264 extending downward from the two side edges of the upper cover 26. The lower edges of the two upper side plates 264 are respectively fixedly connected to the upper edges of the first extension plate 231 and the upper edges of the second extension plate 241. The upper fixing plate 263 is fixedly connected to the front end of the top plate 21, preferably by welding. Preferably, the upper fixing plate 263 is attached to the outer surface of the front end of the top plate 21.

[0034] Furthermore, the shielding cage 2 also includes a lower cover plate 27, the two side edges of which are fixedly connected to the lower edges of the first extension plate 231 and the lower edges of the second extension plate 241, respectively. The rear end of the lower cover plate 27 is fixedly connected to the front end of the base plate 22. In a preferred embodiment, the lower cover plate 27 includes a lower plate body 271, a lower connecting plate 272 extending upward from the rear end of the lower plate body 271, a lower fixing plate 273 extending rearward from the rear end of the lower connecting plate 272, and two lower side plates 274 extending upward from the two side edges of the lower plate body 271. The lower edges of the two lower side plates 274 are fixedly connected to the upper edges of the first extension plate 231 and the upper edges of the second extension plate 241, respectively. The lower fixing plate 273 is fixedly connected to the front end of the base plate 22, preferably by welding. Preferably, the lower fixing plate 273 is attached to the outer surface of the front end of the base plate 22.

[0035] The front edge of the upper plate 261, the front edge of the upper side plate 264, the front edge of the first extension plate 231, the front edge of the second extension plate 241, and the front edge of the lower cover plate 27 collectively form the docking port 10, with the plane of the docking port 10 inclined in the front-to-back direction. In a preferred embodiment, the front edge of the upper plate 261, the front edge of the upper side plate 264, the front edge of the first extension plate 231, the front edge of the second extension plate 241, the front edge of the lower plate 271, and the front edge of the lower side plate 274 collectively form the docking port 10, with the plane of the docking port 10 inclined in the front-to-back direction.

[0036] Please refer to Figures 4 to 12 As shown, in a preferred embodiment, the lower edge of the upper plate portion 264 is fixedly coupled to the upper edge of the first extension plate 231 via a dovetail groove structure, forming a joint 230. The shielding cage 2 further includes an external elastic piece 5, which is affixed to the outer surface of the upper plate portion 264 and the outer surface of the first extension plate 231, and at least covers a portion of the joint 230. In a more preferred embodiment, the upper edge of the lower plate portion 274 is also fixedly coupled to the lower edge of the first extension plate 231 via a dovetail groove structure, forming a joint 240. The external elastic piece 5 is affixed to the outer surface of the upper plate portion 264, the outer surface of the first extension plate 231, and the outer surface of the lower plate portion 274, and at least covers a portion of the joint 230 and the joint 240. In a preferred embodiment, the external elastic piece 5 includes a main body 51 and an arc-shaped elastic extension piece 52 extending from the edge of the main body 51 along the insertion direction of the docking optical module plug 200, and the main body 51 is fitly fixed to the outer surface of the upper plate portion 264, the outer surface of the first extension plate 231 and the outer surface of the lower plate portion 274.

[0037] Please refer to Figures 6 to 12 As shown, a plurality of through holes 2621 are formed through the upper connecting plate 262 in the front-to-back direction. A plurality of through holes 2721 are formed through the lower connecting plate 272 in the front-to-back direction. The through holes 2621 and the through holes 2721 can facilitate the circulation of internal and external air and enhance heat dissipation. Furthermore, a convex portion 211 is formed on the top plate 21 protruding upward near the front end, and the upper fixing plate 263 is attached to the outer surface of the front end of the top plate 21 and stops at the convex portion 211 rearward. In a preferred embodiment, the upper fixing plate 263 is fixed to the outer surface of the front end of the top plate 21 by welding.

[0038] Preferably, the shielding cage 2 also includes an upper heat dissipation module 3, which is assembled on the top plate 21. Preferably, a clearance hole 301 is formed through the top plate 21 in the vertical direction, and a contact boss 301 is formed on the lower surface of the upper heat dissipation module 3, correspondingly extending downward through the clearance hole 210 into the docking cavity. The contact boss 301 is used to contact and transfer heat with the optical module plug 200 inserted into the docking cavity. In one embodiment, the upper heat dissipation module 3 is straddled by an elastic locking member 6. The ends of the elastic locking member 6 are correspondingly secured to the outer surfaces of the left and right panels 23 and 24, ultimately achieving a movable fixation of the upper heat dissipation module 3 to the top plate 21. When the optical module plug 200 is inserted into the docking cavity, the upper heat dissipation module 3 is lifted upward to ensure stable thermal contact between the contact boss 301 of the upper heat dissipation module 3 and the optical module plug 200.

[0039] Furthermore, a limiting portion 31 is formed on the front edge of the upper heat dissipation module 3. The limiting portion 31 is formed above the upper fixing plate 263 and is used to limit the upper fixing plate 263 downward. In addition, the upper heat dissipation module 3 protrudes upward to form a plurality of grille columns 32 arranged in an array. The plurality of grille columns 32 are arranged in a plurality of rows along the front-to-back direction. In the left-right direction perpendicular to the front-to-back direction, an air flow channel 30 is formed between two adjacent rows of the grille columns 32. The through holes 2621 formed on the upper connecting plate 262 of the upper cover plate 26 are correspondingly connected to the air flow channel 30 along the front-to-back direction to improve the air flowability and enhance the heat dissipation performance.

[0040] Please refer to Figure 5 、 Figure 6 、 Figures 9 to 11 As shown, a cantilevered elastic arm 221 is formed near the front end of the base plate 22. Slits 2210 are machined on either side of the elastic arm 221. The elastic arm 221 includes a portion angled toward the mating cavity. A clearance opening 270 is formed on the lower cover plate 27 at a position corresponding to the elastic arm 221. This clearance opening 270 allows for elastic deformation of the elastic arm 221. The clearance opening 270 comprises a portion formed on the lower fixing plate 273 and a portion extending from the lower connecting plate 272. The clearance opening 270 separates the lower fixing plate 273 into two separate parts along the left-right direction. The clearance opening 270 does not separate the lower connecting plate 272. This design facilitates machining and maintains a high level of overall structural strength for the lower cover plate 27. The elastic arm 221 elastically pushes upward against the optical module plug 200 inserted into the mating cavity, thereby providing a certain degree of docking locking function. In addition, the optical module plug 200 can maintain an upward movement trend, further ensuring stable contact between the optical module plug 200 and the upper heat dissipation module 3 .

[0041] Please refer to Figure 4 As shown, the electrical connector assembly 100 in the design of the present application is designed to form a docking port 10 that is tilted in the front-to-back direction, which enables the operating lever 201 of the optical module plug 200 inserted into the docking cavity to be partially exposed. When the optical module plug 200 needs to be unplugged, the user can more conveniently grab the operating lever 201. The design of the present application also improves the heat dissipation effect. It makes it possible to arrange multiple electrical connector assemblies 100 side by side and densely. In addition, it indirectly enables the corresponding optical module plug 200 that is docked therewith to be tilted, which can improve the space utilization outside the equipment box 4.

[0042] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An electrical connector assembly, characterized in that: include: A terminal module (1) is formed with an insulating body (11) and a plurality of terminal pieces (12) fixed to the insulating body (11); A shielding cage (2) is formed with a top plate (21), a bottom plate (22) arranged opposite to the top plate (21) in the vertical direction, a left side plate (23) connecting one side of the top plate (21) and the bottom plate (22), a right side plate (24) connecting the other side of the top plate (21) and the bottom plate (22) and arranged opposite to the left side plate (23), and a rear end plate (25) coupled to the rear end edges of the left side plate (23) and the right side plate (24); The top plate (21), the bottom plate (22), the left side plate (23), the right side plate (24) and the rear end plate (25) are jointly arranged to form a docking cavity and an opening is formed at the front end; a mounting opening (202) is formed between the rear end edge of the bottom plate (22) or the rear end edge of the top plate (21) and the rear end plate (25); and the terminal module (1) is assembled in the shielding cage (2) through the mounting opening (202); A first extension plate (231) is formed by further extending the front end edge of the left side plate (23); A second extension plate (241) is formed by further extending the front end edge of the right side plate (24) forward; An upper cover plate (26) comprises an upper plate body (261), an upper connecting plate (262) formed by extending downward from the rear end edge of the upper plate body (261), an upper fixing plate (263) formed by extending backward from the rear end edge of the upper connecting plate (262), and two upper side plate portions (264) provided on both side edges of the upper cover plate (26) and extending downward, wherein the lower edges of the two upper side plate portions (264) are respectively fixedly connected to the upper edge of the first extension plate (231) and the upper edge of the second extension plate (241), and the upper fixing plate (263) is fixedly connected to the front end position of the top plate (21); a lower cover plate (27), wherein both side edges of the lower cover plate (27) are fixedly connected to the lower edge of the first extension plate (231) and the lower edge of the second extension plate (241), respectively, and the rear end of the lower cover plate (27) is fixedly connected to the front end of the bottom plate (22); The front end edge of the upper plate body (261), the front end edge of the upper side plate portion (264), the front end edge of the first extension plate (231), the front end edge of the second extension plate (241), and the front end edge of the lower cover plate (27) are combined to form a docking interface (10), and the plane where the docking interface (10) is located is inclined in the front-to-back direction.

2. The electrical connector assembly according to claim 1, wherein: The lower edge of the upper side plate portion (264) is fixed to the upper edge of the first extension plate (231) via a dovetail groove structure to form a joint seam (230); and the outer spring piece (5) is also included. The outer spring piece (5) is fixed to the outer surface of the upper side plate portion (264) and the outer surface of the first extension plate (231), and the outer spring piece (5) at least covers a portion of the joint seam (230).

3. The electrical connector assembly according to claim 1, wherein: The lower cover plate (27) comprises a lower plate body (271), a lower connecting plate (272) formed by extending upward from the rear end edge of the lower plate body (271), a lower fixing plate (273) formed by extending backward from the rear end edge of the lower connecting plate (272), and two lower side plate portions (274) arranged on both side edges of the lower plate body (271) and extending upward, wherein the lower edges of the two lower side plate portions (274) are respectively fixedly connected to the upper edge of the first extension plate (231) and the upper edge of the second extension plate (241), and the lower fixing plate (273) is fixedly connected to the front end position of the bottom plate (22).

4. The electrical connector assembly according to claim 1, wherein: A plurality of through holes (2621) are formed through the upper connecting plate (262) along the front-to-back direction.

5. The electrical connector assembly according to claim 1, wherein: The top plate (21) has a convex portion (211) protruding upward near the front end, and the upper fixing plate (263) is attached to the outer surface of the front end of the top plate (21) and stops at the convex portion (211) backward.

6. The electrical connector assembly according to claim 3, wherein: A cantilevered elastic arm (221) is formed on the bottom plate (22) near the front end, with machining gaps (2210) formed on both sides of the elastic arm (221), and the elastic arm (221) includes a portion inclined toward the docking cavity; A clearance opening (270) is formed on the lower cover plate (27) and corresponds to the elastic arm (221), and the clearance opening (270) is used to allow elastic deformation of the elastic arm (221).

7. The electrical connector assembly according to claim 6, wherein: The clearance opening (270) comprises a portion formed on the lower fixing plate (273) and a portion extending from the lower connecting plate (272), and the clearance opening (270) separates the lower fixing plate (273) into two parts along the left-right direction.

8. The electrical connector assembly according to any one of claims 1 to 7, wherein: Also includes: An upper heat dissipation module (3) is assembled on the top plate (21), and a limiting portion (31) is formed on the front edge of the upper heat dissipation module (3), wherein the limiting portion (31) is formed above the upper fixing plate (263).

9. The electrical connector assembly according to claim 8, wherein: The upper heat dissipation module (3) extends in the front-to-back direction to form a plurality of air flow channels (30) arranged in the left-to-right direction, and the through holes (2621) formed on the upper connecting plate (262) of the upper cover plate (26) are correspondingly connected to the air flow channels (30) in the front-to-back direction.

10. A communication device comprising a plurality of electrical connector assemblies according to any one of claims 1 to 9, characterized in that: It also includes a device box (4), wherein a plurality of the electrical connector assemblies are arranged in a first direction inside the device box (4), and a docking port (10) of each of the electrical connector assemblies passes through an end face (41) of the device box (4) and is exposed outward, and a plane where the docking port (10) is located is parallel to or flush with a plane where the end face (41) is located.

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