A high-speed electrical connector and production process

Abstract

This application relates to the field of high-speed electrical connectors, and specifically discloses a high-speed electrical connector and a production process. It includes a housing and a main terminal row provided on the housing, and also includes a common ground plate, and the common ground plate is electrically connected to the main terminal row. This application has the effect of improving the problem of high-frequency crosstalk existing in high-speed electrical connectors.

Description

Technical Field

[0001] This application relates to the field of high-speed electrical connectors, and in particular to a high-speed electrical connector and a production process. Background Art

[0002] The main function of a high-speed connector is to connect devices and transmit data. Its transmission rate is faster than that of ordinary connectors, and it can ensure the stability and reliability of data transmission. It is commonly used in fields such as computers, communication devices, industrial automation, and medical equipment.

[0003] The double-sided pin high-speed electrical connector is a type of high-speed electrical connector, which has advantages in scenarios where a large amount of data needs to be transmitted or a high-seal connection is required between devices. However, the double-sided pin high-speed electrical connector has many contact points and a small contact point spacing, resulting in the problem of high-frequency crosstalk in the double-sided pin high-speed electrical connector, which affects signal transmission. Summary of the Invention

[0004] In order to improve the problem of high-frequency crosstalk in high-speed electrical connectors, this application provides a high-speed electrical connector and a production process.

[0005] In a first aspect, a high-speed electrical connector provided by this application adopts the following technical solution:

[0006] A high-speed electrical connector includes a housing and a main terminal row disposed on the housing, and further includes a common ground plate, and the common ground plate is electrically connected to the main terminal row.

[0007] By adopting the above technical solution, by adding a common ground plate and electrically connecting the common ground plate to the main terminal row, the problem of high-frequency crosstalk can be effectively improved, and the stability and reliability of signal transmission are ensured.

[0008] Optionally, the housing includes a main housing and a common ground housing connected to the main housing. The main terminal row is connected to the main housing, and the common ground plate is disposed on the common ground housing.

[0009] By adopting the above technical solution, since the terminals in the main terminal row are small in size and the connection parts on the common ground plate for connecting to the terminals are small in size, first connecting the main terminal row to the main housing and connecting the common ground plate to the common ground housing can effectively improve the structural stability and reliability of the terminals in the main terminal row and the common ground plate. The main terminal row and the common ground plate assembled in this way can effectively ensure that the terminals in the main terminal row are aligned and in contact with the common ground plate, which helps to connect the terminals in the main terminal row to the common ground plate.

[0010] Optionally, a positioning groove is formed on the main housing, a positioning block inserted into the positioning groove is disposed on the common ground housing, a main card slot is formed on the groove wall of the positioning groove, and a main card block engaged with the main card slot is formed on the side wall of the positioning block.

[0011] By adopting the above technical solution, when connecting the main terminal block and the common ground piece, the positioning block on the common ground shell is inserted into the positioning groove on the main shell, and the clamping block is clamped and matched with the clamping groove. Positioning through the positioning block and the positioning groove helps to align the terminals in the main terminal block with the common ground piece. The cooperation between the clamping block and the clamping groove makes the main shell and the common ground shell relatively fixed, which helps with subsequent processing of the main shell and the common ground shell or processing of the terminals in the main terminal block and the common ground piece.

[0012] Optionally, welding holes are formed in the common ground shell, the common ground piece includes a plurality of welding segments, and the welding holes are aligned with one of the terminals in the main terminal block and one of the welding segments.

[0013] By adopting the above technical solution, when welding and connecting one of the welding segments with one of the terminals in the main terminal block, since the welding holes are aligned with one of the terminals in the main terminal block and one of the welding segments, that is, the operator can insert the end of the relevant welding equipment into the welding holes for welding. Through the welding holes, it can not only play an auxiliary positioning role for the welding operation of the operator or the welding equipment, improve the welding precision, but also limit the overflow of solder, improving the welding quality. During subsequent injection molding, the plastic will flow into the welding holes and seal the welding joint between the terminals and the common ground piece, thus greatly improving the structural stability of the welding joint between the terminals and the common ground piece.

[0014] Optionally, a first fixing hole and a second fixing hole communicating with the first fixing hole are respectively formed on two opposite side walls of the common ground piece, a communicating hole penetrating the common ground piece is formed in the common ground shell, and the communicating hole communicates with both the first fixing hole and the second fixing hole. The cross-sectional widths of the first fixing hole and the second fixing hole are both larger than that of the communicating hole. The housing further includes a fixing shell, and the fixing shell is provided with a first fixing block disposed in the first fixing hole, a connecting block disposed in the communicating hole, and a second fixing block disposed in the second fixing hole.

[0015] By adopting the above technical solution, after the terminals in the main terminal block and the common ground piece are welded and connected, injection molding continues, and the plastic flows into the welding holes, the first fixing hole, the second fixing hole and the communicating hole. After the plastic solidifies, the plastic seals the welding holes, the first fixing hole, the second fixing hole and the communicating hole. Since the cross-sectional widths of the first fixing hole and the second fixing hole are both larger than that of the communicating hole, the cross-sectional widths of the first fixing block and the second fixing block are larger than that of the connecting block. In this way, it not only helps the plastic for subsequent injection molding to connect with the common ground shell, but also strengthens the limiting and fixing effect on the common ground piece.

[0016] Optionally, it further includes an anti-crosstalk component and a secondary terminal row. The anti-crosstalk component includes a conductive bar, a conductive block, and a wave-absorbing block. The conductive block and the wave-absorbing block are both connected to the conductive bar. The main terminal row includes a variable signal group, and the secondary terminal row includes a high-speed signal group. The conductive block abuts against the high-speed signal group, and the wave-absorbing block abuts against the variable signal group.

[0017] By adopting the above technical solution, the conductive block can further improve the high-frequency crosstalk of the high-speed signal group and adjust the resonance, and the wave-absorbing block can further improve the high-frequency crosstalk of the variable signal group and adjust the resonance. For the high-speed signal group and the variable signal group, the conductive block and the wave-absorbing block are specifically set, further improving the signal transmission stability of the connector of the present application.

[0018] In a second aspect, a production process provided by the present application adopts the following technical solution:

[0019] A production process for processing a high-speed electrical connector, the high-speed electrical connector including a secondary terminal row, includes the following steps:

[0020] Common ground assembly: Combining the main terminal row and the common ground plate;

[0021] Secondary terminal installation: Installing the secondary terminal row onto the housing.

[0022] By adopting the above technical solution, for the high-speed electrical connector assembled in such a way, its main terminal row is connected to the common ground plate, and the common ground plate can effectively improve the crosstalk problem and improve the stability and reliability of signal transmission.

[0023] Optionally, the main terminal row includes a high-speed signal group and the remaining main terminal groups. Both the high-speed signal group and the remaining main terminal groups include grounding terminals. The common ground assembly step further includes welding the grounding terminals to the common ground plate.

[0024] By adopting the above technical solution, compared with the connection between the grounding terminal and the common ground plate only by abutting, by welding the grounding terminal and the common ground plate, the stability of the direct connection between the grounding terminal and the common ground plate can be improved, thereby ensuring that the common ground plate can improve the crosstalk problem.

[0025] Optionally, the housing includes a main housing and a common ground housing. Before the common ground assembly step, it further includes a main terminal installation step and a common ground housing forming step;

[0026] Main terminal installation: Installing the main terminal row onto the main housing;

[0027] Common ground housing forming: Forming the common ground housing on the common ground plate by injection molding.

[0028] By adopting the above technical solution, the main terminal block is installed on the main shell, and the main shell fixes and protects the main terminal block. On the one hand, it can limit the relative movement of the terminals in the main terminal block, and on the other hand, it can minimize the deformation of the terminals in the main terminal block due to extrusion and impact. The common ground shell is formed on the common ground sheet by injection molding, so that the common ground sheet can be fixed and protected. The main terminal block integrated with the main shell and the common ground sheet integrated with the common ground shell are connected, which can improve the matching accuracy between the terminals in the main terminal block and the common ground sheet, which is helpful for the subsequent connection of the terminals in the main terminal block and the common bottom sheet.

[0029] Optionally, the common shell forming step further includes forming a welding hole on the common shell, the common shell includes a plurality of welding segments, and the common shell forming step further includes forming a welding hole on the common shell, the welding hole is directly opposite to one of the terminals in the main terminal row and one of the welding segments;

[0030] The common crust forming step also includes forming a first fixing hole and a second fixing hole connected to the first fixing hole on the two back side walls of the common crust, respectively; a connecting hole penetrating the common crust is provided on the common crust, and the connecting hole is connected to both the first fixing hole and the second fixing hole; the shell also includes a fixing shell, and the fixing shell is provided with a first fixing block arranged in the first fixing hole, a second fixing block arranged in the second fixing hole, and a connecting block arranged in the connecting hole; and the common assembling step also includes a fixing shell forming step after the common assembling step:

[0031] Fixing shell molding: the first fixing block is molded in the first fixing hole, the second fixing block is molded in the second fixing hole, and the connecting block is molded in the connecting hole by injection molding.

[0032] By adopting the above technical solution, the common shell is formed with welding holes, which can assist in positioning the subsequent welding of the staff or equipment, thereby improving the efficiency and accuracy of welding. When the injection molding is continued after the welding is completed, the plastic enters the welding hole to seal the welding point between the terminal in the main terminal row and the welding section, further improving the structural stability of the welding point.

[0033] During the fixed injection molding, the plastic will flow into the welding hole to seal the welding hole. At the same time, the plastic will also flow into the first fixing hole, the second fixing hole and the connecting hole, and form the first fixing block, the second fixing block and the connecting block, which can effectively improve the stability of the connection between the fixed shell and the common shell, and further improve the structural stability of the common shell and the structural stability between the common shell and the common shell.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] Adding a common ground plate and electrically connecting the common ground plate to the main terminal row can effectively improve the crosstalk problem and enhance the stability and reliability of signal transmission;

[0036] Injecting the common ground shell onto the common ground plate can reinforce and protect the common ground plate, improve the structural stability of the main terminal row and the common ground plate, and facilitate the subsequent welding of the grounding terminal and the welding section;

[0037] Through the welding holes, the simplicity and welding quality of the subsequent welding of the grounding terminal and the welding section are improved. Description of the Drawings

[0038] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present application.

[0039] Figure 2 It is a schematic structural diagram highlighting the common ground plate in Embodiment 1 of the present application.

[0040] Figure 3 It is a schematic structural diagram highlighting the common ground shell in Embodiment 1 of the present application.

[0041] Figure 4 It is Figure 3 An enlarged schematic diagram of part A in

[0042] Figure 5 It is an exploded schematic diagram highlighting the fixed shell in Embodiment 1 of the present application.

[0043] Figure 6 It is Figure 5 An enlarged schematic diagram of part B in

[0044] Figure 7 It is a schematic structural diagram highlighting the secondary terminal row in Embodiment 1 of the present application.

[0045] Figure 8 It is a schematic structural diagram highlighting the secondary terminal row, the main terminal row, and the anti-crosstalk component in Embodiment 2 of the present application.

[0046] Figure 9 It is a flowchart of Embodiment 3 of the present application.

[0047] Figure 10 It is a flowchart of Embodiment 4 of the present application.

[0048] Description of the Reference Numerals:

[0049] 1. Housing; 11. Main housing; 111. Positioning groove; 112. Main card slot; 113. Sub-card slot; 12. Common ground housing; 121. Positioning block; 122. Main card block; 123. Forming groove; 124. Welding hole; 125. First fixing hole; 126. Second fixing hole; 13. Fixed housing; 131. Plugging block; 132. First fixing block; 133. Connecting block; 134. Second fixing block; 2. Main terminal row; 21. Variable signal group; 211. Signal terminal; 212. Ground terminal; 22. Other main terminal groups; 3. Sub-terminal row; 31. High-speed signal group; 32. Other sub-terminal groups; 33. Terminal block; 331. Sub-card block; 34. Isolation block; 35. Crosstalk prevention component; 351. Conductive bar; 352. Conductive block; 353. Wave-absorbing block; 4. Common ground sheet; 41. Sheet body; 411. Communication hole; 42. Welding section. Detailed implementation mode

[0050] The following will further describe this application in detail with reference to the attached Figure 1-10 drawings. Embodiment

[0051] An embodiment of this application discloses a high-speed electrical connector. Refer to Figure 1 , Figure 2 , the high-speed electrical connector includes a housing 1, a main terminal row 2, a sub-terminal row 3, and a common ground sheet 4.

[0052] Refer to Figure 1 , Figure 2 , the housing 1 includes a main housing 11, a common ground housing 12, and a fixed housing 13. The main terminal row 2 includes two variable signal groups 21 and other main terminal groups 22 arranged between the two variable signal groups 21. Both the variable signal group 21 and the other main terminal groups 22 include a plurality of signal terminals 211 and ground terminals 212.

[0053] Refer to Figure 2 , the common ground sheet 4 includes a sheet body 41 and a plurality of welding sections 42 integrally formed on the sheet body 41. The number of welding sections 42 is the same as the number of ground terminals 212. The welding sections 42 are used to abut and weld with the ground terminals 212, that is, the welding sections 42 are electrically connected to the ground terminals 212.

[0054] Refer to Figure 2 , Figure 3 , the common ground housing 12 is formed on the common ground sheet 4 by injection molding. A positioning block 121 is integrally formed on the side wall of the common ground housing 12. A plurality of main card blocks 122 are integrally formed on the two opposite side walls of the positioning block 121. A positioning groove 111 is formed on the side wall of the main housing 11. A plurality of main card slots 112 are correspondingly formed on the two opposite groove walls of the positioning groove 111 for the main card blocks 122. The positioning block 121 is inserted into the positioning groove 111, and each main card block 122 is respectively engaged with a different main card slot 112.

[0055] Refer to Figure 3 、 Figure 4 On one end face of the common crust 12, a forming groove 123 is formed. A plurality of welding holes 124 are formed at the bottom of the forming groove 123. Each welding hole 124 faces a different welding section 42 and the corresponding grounding terminal 212 respectively.

[0056] Refer to Figure 4 、 Figure 5 On the end face of the common crust 12 provided with the welding holes 124, a plurality of first fixing holes 125 are formed. On the end face of the common crust 12 facing away from the forming groove 123, second fixing holes 126 with the same number as the first fixing holes 125 are formed. Each first welding hole 124 communicates with a different second welding hole 124. On the sheet body 41, communication holes 411 with the same number as the first welding holes 124 are formed. The communication holes 411 penetrate through the sheet body 41. Each communication hole 411 communicates with a different first fixing hole 125 respectively, and each communication hole 411 also communicates with a different second communication hole 411 respectively. The first fixing holes 125 and the communication holes 411 are all round holes, and the aperture of the first fixing holes 125 is larger than that of the communication holes 411. The second fixing holes 126 are square holes, and the cross-sectional width of the second fixing holes 126 is larger than that of the communication holes 411.

[0057] Refer to Figure 4 、 Figure 5 The fixing shell 13 is integrally formed in the forming groove 123. On the fixing shell 13, plugging blocks 131 with the same number as the welding holes 124 and first fixing blocks 132 with the same number as the first fixing holes 125 are provided. The plugging blocks 131 and the first fixing blocks 132 are all integrally formed on the fixing shell 13. The number of the plugging blocks 131 is the same as the number of the welding grooves. Each plugging block 131 is respectively embedded in a different welding hole 124.

[0058] Refer to Figure 4 、 Figure 6 Each first fixing block 132 is respectively embedded in a different first fixing hole 125. On the side of the first fixing block 132 away from the fixing shell 13, a connecting block 133 is integrally formed. The connecting block 133 is embedded in a different communication hole 411. On the side of the connecting block 133 away from the first fixing block 132, a second fixing block 134 is integrally formed. Each second fixing block 134 is respectively embedded in a different second fixing hole 126.

[0059] Refer to Figure 2 、 Figure 7 The secondary terminal row 3 includes a high-speed signal group 31 and two groups of secondary remaining terminal groups 32. The two main remaining terminal groups 22 are respectively arranged on both sides of the high-speed signal group 31. The high-speed signal group 31 and the main remaining terminal groups 22 are the same as the variable signal group 21 and the main remaining terminal groups 22 in a plurality of signal terminals 211 and grounding terminals 212.

[0060] Refer to Figure 3 、 Figure 7 On the high-speed signal group 31, a terminal block 33 is provided, and the terminal block 33 is injection-molded on the high-speed signal group 31. A plurality of secondary locking blocks 331 are integrally formed on the terminal block 33, and a plurality of secondary card slots 113 are provided on the main housing 11 corresponding to the secondary locking blocks 331. The secondary terminal row 3, the terminal block 33, and the isolation block 34 are inserted into the main housing 11, and each main locking block 122 is respectively engaged with a different secondary locking block 331. An isolation block 34 is inserted between the secondary terminal row 3 and the main terminal row 2, and the isolation block 34 separates the main terminal row 2 and the secondary terminal row 3.

[0061] The implementation principle of Embodiment 1 of this application is: adding a common ground plate 4 connected to the ground terminal 212 greatly improves the crosstalk problem and improves the stability and reliability of signal transmission. Embodiment

[0062] Refer to Figure 8 In this embodiment, the difference from Embodiment 1 is that the variable signal group 21 is provided with the same terminal block 33 as that on the high-speed signal group 31, and the terminal block 33 on the variable signal group 21 is integrally formed on the variable signal group 21. An anti-crosstalk component 35 is inserted between the main terminal row 2 and the secondary terminal row 3. The anti-crosstalk component 35 includes a conductive strip 351, a plurality of conductive blocks 352, and a plurality of wave-absorbing blocks 353. The conductive strip 351 is made of metal and can conduct electricity. The conductive blocks 352 are integrally formed on the conductive strip 351 by conductive plastic, and the wave-absorbing blocks 353 are integrally formed on the conductive strip 351 by wave-absorbing material. The conductive blocks 352 are in contact with the signal terminals 211 and the ground terminal 212 in the high-speed signal group 31, and the wave-absorbing blocks 353 are in contact with the signal terminals 211 and the ground terminal 212 in the variable signal group 21.

[0063] The implementation principle of Embodiment 2 of this application is: the conductive blocks 352 can effectively improve the high-frequency crosstalk problem of the high-speed signal group 31, and the wave-absorbing blocks 353 can effectively improve the crosstalk and resonance problems of the variable signal group 21. Embodiment

[0064] This application embodiment discloses a production process. Refer to Figure 8 The production process includes the following steps:

[0065] Main terminal installation: Install the main terminal row on the main housing.

[0066] Common ground crust forming: The common ground crust is formed on the common ground sheet by injection molding. A shell groove, welding holes equal in number to the welding segments, first fixing holes equal in number to the communication holes, and second fixing holes equal in number to the first fixing holes are formed on the common ground crust. Each welding hole is respectively opposite to a different welding segment, each first fixing hole is respectively communicated with a different second fixing hole, and each communication hole is respectively communicated with a different first fixing hole and second fixing hole.

[0067] Common ground assembly: First, insert the positioning block into the positioning groove, each main clamping block is respectively clamped and matched with the corresponding main clamping groove, each grounding terminal is respectively abutted against a different welding segment, and then weld the grounding terminal and the corresponding welding segment.

[0068] Fixed shell forming: The fixed shell is formed in the shell groove by injection molding, the first fixing block is formed in the first fixing hole, the second fixing block is formed in the second fixing hole, and the connecting block is formed in the communication hole.

[0069] Auxiliary terminal installation: Insert the auxiliary terminal row, terminal seat, and isolation seat into the main shell, and each auxiliary clamping block is respectively clamped and matched with a different auxiliary clamping groove.

[0070] The implementation principle of a production process in an embodiment of this application is as follows: After forming the main shell on the main terminal row and forming the common ground crust on the common ground sheet, then assemble the main shell and the common ground crust to connect and align the grounding terminal with the welding segment, which helps to align the welding terminal with the welding segment. The welding groove guides the subsequent welding and restricts the solder at the same time, improving the simplicity and quality of welding. After welding, injection molding the common ground crust can seal the welding holes, further improving the structural stability of the welding part between the welding segment and the grounding terminal.

[0071] With such a setting, the simplicity of welding, welding quality, and structural stability of the connection part can be greatly improved. Embodiment

[0072] Common ground crust forming: The common ground crust is formed on the common ground sheet by injection molding.

[0073] Common ground assembly: Assemble the common ground crust to the main shell.

[0074] Fixed shell forming: The fixed shell is formed on the main shell and the common ground crust by injection molding.

[0075] Main terminal group and auxiliary terminal group forming: The terminal seat is formed on the variable signal group and the high-speed signal group by injection molding.

[0076] Anti-crosstalk component forming: First, form the wave-absorbing block on the conductive strip by injection molding, and then form the conductive block on the conductive strip by injection molding; or

[0077] First, the conductive block is formed on the conductive bar by injection molding, and then the wave-absorbing block is formed on the conductive bar by injection molding.

[0078] Final assembly: Insert the main terminal block, auxiliary terminal block, terminal seat and anti-crosstalk component into the main housing.

[0079] The above are all preferred embodiments of the present application. Without restricting the protection scope of the present application accordingly, therefore: All equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A high-speed electrical connector, comprising a housing (1) and a main terminal block (2) arranged on the housing (1), characterized in that: It also includes a common ground sheet (4), wherein the common ground sheet (4) is electrically connected to the main terminal block (2); The housing (1) comprises a main housing (11) and a common ground housing (12) connected to the main housing (11); the main terminal block (2) is connected to the main housing (11); and the common ground sheet (4) is arranged on the common ground housing (12); A first fixing hole (125) and a second fixing hole (126) communicating with the first fixing hole (125) are respectively provided on two back side walls of the common ground sheet (4); a connecting hole (411) penetrating the common ground sheet (4) is provided on the common ground shell (12); the connecting hole (411) is communicated with both the first fixing hole (125) and the second fixing hole (126); the cross-sectional widths of the first fixing hole (125) and the second fixing hole (126) are both greater than the connecting hole (411); the housing (1) further comprises a fixing shell (13); the fixing shell (13) is provided with a first fixing block (132) arranged in the first fixing hole (125), a connecting block (133) arranged in the communicating hole (411), and a second fixing block (134) arranged in the second fixing hole (126).

2. A high-speed electrical connector according to claim 1, characterized in that: The main shell (11) is provided with a positioning groove (111), the common shell (12) is provided with a positioning block (121) inserted in the positioning groove (111), a main card slot (112) is provided on the groove wall of the positioning groove (111), and a main card block (122) card-engaged with the main card slot (112) is provided on the side wall of the positioning block (121).

3. A high-speed electrical connector according to claim 1, characterized in that: The common ground shell (12) is provided with a welding hole (124), the common ground sheet (4) comprises a plurality of welding sections (42), and the welding hole (124) is directly opposite to one of the terminals in the main terminal row (2) and one of the welding sections (42).

4. A high-speed electrical connector according to claim 1, characterized in that: It also includes an anti-crosstalk component (35) and a secondary terminal block (3); the anti-crosstalk component (35) includes a conductive strip (351), a conductive block (352) and an absorbing block (353); the conductive block (352) and the absorbing block (353) are both connected to the conductive strip (351); the main terminal block (2) includes a variable signal group (21); the secondary terminal block (3) includes a high-speed signal group (31); the conductive block (352) contacts the high-speed signal group (21); and the absorbing block (353) contacts the variable signal group (21).

5. A production process, characterized in that: Used for processing the high-speed electrical connector according to claim 1, wherein the high-speed electrical connector comprises a secondary terminal row (3), comprising the following steps: Common ground assembly: combine the main terminal block (2) and the common ground sheet (4); Auxiliary terminal installation: Install the auxiliary terminal block (3) onto the housing (1).

6. A production process according to claim 5, characterized in that: The main terminal block (2) comprises a variable signal group (21) and a main remaining terminal group (22), the variable signal group (21) and the main remaining terminal group (22) both comprise a grounding terminal (212), and the common ground assembly step further comprises welding the grounding terminal (212) to a common ground sheet (4).

7. A production process according to claim 5, characterized in that: The housing (1) comprises a main housing (11) and a common housing (12), and the common housing assembly step also comprises a terminal injection molding step and a common housing (12) molding step before the common housing assembly step; Main terminal installation: install the main terminal block (2) onto the main housing (11); Molding of the common crust (12): The common crust (12) is molded on the common sheet (4) by injection molding.

8. A production process according to claim 6, characterized in that: The common shell forming step further includes forming a welding hole (124) on the common shell (12), the common shell (4) includes a plurality of welding sections (42), and the common shell (12) forming step further includes forming a welding hole (124) on the common shell (12), the welding hole (124) facing one of the terminals in the main terminal row (2) and one of the welding sections (42); The step of forming the common shell (12) further comprises forming a first fixing hole (125) and a second fixing hole (126) connected to the first fixing hole (125) on two rear side walls of the common shell (12), the common shell (12) is provided with a connecting hole (411) penetrating the common shell (4), the connecting hole (411) is connected to both the first fixing hole (125) and the second fixing hole (126), the housing (1) further comprises a fixing shell (13), the fixing shell (13) is provided with a first fixing block (132) arranged in the first fixing hole (125), a second fixing block (134) arranged in the second fixing hole (126), and a connecting block (133) arranged in the connecting hole (411), and the step of forming the fixing shell (13) is further comprised after the common shell assembly step: The fixing shell (13) is molded by injection molding the first fixing block (132) in the first fixing hole (125), the second fixing block (134) in the second fixing hole (126), and the connection block (133) in the connecting hole (411).

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