High-speed electric connector and production process

Abstract

The invention relates to the field of high-speed electric connectors, and particularly discloses a high-speed electric connector and a production process, the high-speed electric connector comprises a shell and a main terminal strip arranged on the shell, and further comprises a common ground piece, and the common ground piece is electrically connected with the main terminal strip. The high-speed electric connector has the effect of improving the problem of high-frequency crosstalk existing in the high-speed electric connector.

Description

Technical Field

[0001] The present 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 high-speed connectors is to connect devices and transmit data. Their transmission rate is faster than that of ordinary connectors, and they can ensure the stability and reliability of data transmission. They are often used in computers, communication equipment, industrial automation, medical equipment and other fields.

[0003] 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 transmission is required or a high-sealing connection is required between devices. However, double-sided pin high-speed electrical connectors have many contact points and small contact point spacing, which leads to high-frequency crosstalk in double-sided pin high-speed electrical connectors, affecting signal transmission. Summary of the invention

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

[0005] In a first aspect, the present application provides a high-speed electrical connector adopting the following technical solution: A high-speed electrical connector comprises a shell and a main terminal row arranged on the shell, and also comprises a common ground sheet, wherein the common ground sheet is electrically connected to the main terminal row.

[0006] By adopting the above technical solution, by adding a common ground piece and electrically connecting the common ground piece with the main terminal row, the problem of high-frequency crosstalk can be effectively improved, and the stability and reliability of signal transmission can be guaranteed.

[0007] Optionally, the shell includes a main shell and a common ground shell connected to the main shell, the main terminal row is connected to the main shell, and the common ground sheet is arranged on the common ground shell.

[0008] By adopting the above technical solution, since the terminals in the main terminal block are small in size and the connection part on the common ground sheet for connecting with the terminals is small in size, the main terminal block is first connected to the main shell and the common ground sheet is connected to the common ground shell, which can effectively improve the structural stability and reliability of the terminals in the main terminal block and the common ground sheet. The main terminal block and the common ground sheet assembled in this way can effectively ensure that the terminals in the main terminal block are aligned and in contact with the common ground sheet, which is helpful for connecting the terminals in the main terminal block with the common ground sheet.

[0009] Optionally, a positioning groove is provided on the main shell, a positioning block inserted in the positioning groove is provided on the common shell, a main card slot is provided on the groove wall of the positioning groove, and a main card block engaged with the main card slot is provided on the side wall of the positioning block.

[0010] By adopting the above technical solution, when connecting the main terminal block and the common ground sheet, the positioning block on the common ground shell is inserted into the positioning groove on the main shell, and the clamping block and the clamping groove are clamped together. Positioning by the positioning block and the positioning groove helps to align the terminals in the main terminal block with the common ground sheet. The cooperation between the clamping block and the clamping groove makes the main shell and the common ground shell relatively fixed, which helps to process the main shell and the common ground shell or the terminals in the main terminal block and the common ground sheet in the subsequent processing.

[0011] Optionally, a welding hole is opened on the common ground shell, the common ground plate includes a plurality of welding segments, and the welding hole is directly opposite to one of the terminals in the main terminal row and one of the welding segments.

[0012] By adopting the above technical solution, when the welding section is welded to one of the terminals in the main terminal block, since the welding hole is directly opposite to one of the terminals and one of the welding sections in the main terminal block, the staff can simply insert the end of the relevant welding equipment into the welding hole for welding. The welding hole can not only assist the welding operation of the staff or welding equipment in positioning, but also improve the welding accuracy, while limiting the overflow of solder and improving the welding quality. During subsequent injection molding, the plastic will flow into the welding hole and seal the welding point between the terminal and the common ground plate, which greatly improves the structural stability of the welding point between the terminal and the common ground plate.

[0013] Optionally, a first fixing hole and a second fixing hole connected to the first fixing hole are respectively provided on two back side walls of the common ground sheet, and a connecting hole penetrating the common ground sheet is provided on the common ground shell, which is connected to both the first fixing hole and the second fixing hole, and the cross-sectional widths of the first fixing hole and the second fixing hole are both larger than the connecting hole. The shell also includes a fixing shell, and a first fixing block arranged in the first fixing hole, a connecting block arranged in the connecting hole, and a second fixing block arranged in the second fixing hole are provided on the fixing shell.

[0014] By adopting the above technical solution, after the terminals in the main terminal row are connected to the common ground sheet by welding, the injection molding is continued, and the plastic flows into the welding hole, the first fixing hole, the second fixing hole and the connecting hole. After the plastic solidifies, the plastic seals the welding hole, the first fixing hole, the second fixing hole and the connecting hole. Since the cross-sectional widths of the first fixing hole and the second fixing hole are both larger than the connecting hole, the cross-sectional widths of the first fixing block and the second fixing block are larger than the cross-sectional width of the connecting block. This not only helps the subsequent injection molding of the plastic to connect to the common ground shell, but also strengthens the limiting and fixing effect of the common ground sheet.

[0015] Optionally, it also includes an anti-crosstalk component and a sub-terminal row, the anti-crosstalk component includes a conductive strip, a conductive block and an absorbing block, the conductive block and the absorbing block are both connected to the conductive strip, the main terminal row includes a variable signal group, the sub-terminal row includes a high-speed signal group, the conductive block conflicts with the high-speed signal group, and the absorbing block conflicts with the variable signal group.

[0016] 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 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 absorbing block are set specifically to further improve the signal transmission stability of the connector of the present application.

[0017] In the second aspect, a production process provided by the present application adopts the following technical solution: A production process for processing a high-speed electrical connector, the high-speed electrical connector including a secondary terminal row, comprising the following steps: Common ground assembly: combine the main terminal block with the common ground sheet; Auxiliary terminal installation: Install the auxiliary terminal block onto the housing.

[0018] By adopting the above technical solution, the high-speed electrical connector assembled in this way has its main terminal row connected to the common ground sheet, which can effectively improve the crosstalk problem and enhance the stability and reliability of signal transmission.

[0019] Optionally, the main terminal row includes a high-speed signal group and a main remaining terminal group, the high-speed signal group and the main remaining terminal group both include grounding terminals, and the common ground assembly step further includes welding the grounding terminal to the common ground sheet.

[0020] By adopting the above technical solution, compared with connecting the ground terminal and the common ground sheet only by contact, the stability of the direct connection between the ground terminal and the common ground sheet can be improved by welding the ground terminal and the common ground sheet, thereby ensuring that the common ground sheet can improve the crosstalk problem.

[0021] Optionally, the housing includes a main housing and a common housing, and the common housing assembly step also includes a main terminal installation step and a common housing molding step; Main terminal installation: Install the main terminal row onto the main housing; Common crust molding: The common crust is molded on the common ground sheet by injection molding.

[0022] 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.

[0023] 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; 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: 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.

[0024] 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.

[0025] 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.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: Adding a common ground sheet and electrically connecting the common ground sheet to the main terminal block can effectively improve the crosstalk problem and enhance the stability and reliability of signal transmission. Injection molding the common ground shell on the common ground sheet can reinforce and protect the common ground sheet, improve the structural stability of the main terminal block and the common ground sheet, and facilitate the subsequent welding of the ground terminal and the welding section; The welding hole improves the simplicity and welding quality of subsequent welding between the ground terminal and the welding section. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of Example 1 of the present application.

[0028] Figure 2 It is a structural schematic diagram highlighting the common ground piece in Example 1 of the present application.

[0029] Figure 3 It is a schematic diagram of the structure highlighting the common crust in Example 1 of the present application.

[0030] Figure 4 yes Figure 3 A magnified schematic diagram of point A in the middle.

[0031] Figure 5 It is an exploded schematic diagram highlighting the fixed shell in Example 1 of the present application.

[0032] Figure 6 yes Figure 5 A magnified schematic diagram of point B in the middle.

[0033] Figure 7 It is a structural schematic diagram highlighting the auxiliary terminal row in Example 1 of the present application.

[0034] Figure 8 It is a structural schematic diagram highlighting the auxiliary terminal row, the main terminal row and the anti-crosstalk component in Example 2 of the present application.

[0035] Fig. 9 This is a flow chart of Example 3 of the present application.

[0036] Fig.10 This is a flowchart of implementation 4 of this application.

[0037] Description of reference numerals: 1. Shell; 11. Main shell; 111. Positioning slot; 112. Main card slot; 113. Secondary card slot; 12. Common shell; 121. Positioning block; 122. Main card block; 123. Forming groove; 124. Welding hole; 125. First fixing hole; 126. Second fixing hole; 13. Fixed shell; 131. Blocking block; 132. First fixing block; 133. Connecting block; 134. Second fixing block; 2. Main terminal block; 21. Variable signal group; 211. Signal terminal; 212. Ground terminal; 22. Main terminal group; 3. Auxiliary terminal row; 31. High-speed signal group; 32. Auxiliary terminal group; 33. Terminal seat; 331. Auxiliary card block; 34. Isolation seat; 35. Anti-crosstalk component; 351. Conductive strip; 352. Conductive block; 353. Absorbing block; 4. Common ground sheet; 41. Sheet body; 411. Connecting hole; 42. Welding section. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-10 This application is described in further detail. Example

[0039] The present application embodiment discloses a high-speed electrical connector. Figure 1 , Figure 2 The high-speed electrical connector includes a housing 1, a main terminal row 2, a secondary terminal row 3 and a common ground sheet 4.

[0040] Reference Figure 1 , Figure 2 The housing 1 includes a main shell 11, a common shell 12 and a fixed shell 13. The main terminal row 2 includes two groups of variable signal groups 21 and a main remaining terminal group 22 arranged between the two groups of variable signal groups 21. The variable signal group 21 and the main remaining terminal group 22 both include multiple signal terminals 211 and ground terminals 212.

[0041] Reference Figure 2 The common ground sheet 4 includes a sheet body 41 and a plurality of welding segments 42 integrally formed on the sheet body 41 . The number of the welding segments 42 is consistent with the number of the grounding terminals 212 . The welding segments 42 are used to contact and weld with the grounding terminals 212 , that is, the welding segments 42 are electrically connected to the grounding terminals 212 .

[0042] Reference Figure 2 , Figure 3 The common shell 12 is formed on the common sheet 4 by injection molding. A positioning block 121 is integrally formed on the side wall of the common shell 12. A plurality of main clamping blocks 122 are integrally formed on the two opposite side walls of the positioning block 121. A positioning groove 111 is provided on the side wall of the main shell 11. A plurality of main clamping grooves 112 are provided on the two opposite groove walls of the positioning groove 111 corresponding to the main clamping blocks 122. The positioning block 121 is inserted into the positioning groove 111, and each main clamping block 122 is respectively engaged with a different main clamping groove 112.

[0043] Reference Figure 3 , Figure 4 A forming groove 123 is formed on one end surface of the common shell 12 , and a plurality of welding holes 124 are formed at the bottom of the forming groove 123 . Each welding hole 124 is respectively opposite to a different welding section 42 and a corresponding grounding terminal 212 .

[0044] Reference Figure 4 , Figure 5 , a plurality of first fixing holes 125 are provided on the end surface of the common shell 12 with the welding holes 124, and a number of second fixing holes 126 are provided on the end surface of the common shell 12 facing away from the forming groove 123, which is the same as the number of the first fixing holes 125, and each first welding hole 124 is connected to a different second welding hole 124. The sheet body 41 is provided with connecting holes 411 which are the same as the number of the first welding holes 124, and the connecting holes 411 penetrate the sheet body 41. Each connecting hole 411 is connected to a different first fixing hole 125, and each connecting hole 411 is also connected to a different second connecting hole 411. Both the first fixing hole 125 and the connecting hole 411 are circular holes, and the aperture of the first fixing hole 125 is larger than that of the connecting hole 411. The second fixing hole 126 is a square hole, and the cross-sectional width of the second fixing hole 126 is larger than that of the connecting hole 411.

[0045] Reference Figure 4 , Figure 5 The fixed shell 13 is integrally formed in the molding groove 123, and the fixed shell 13 is provided with a blocking block 131 having the same number of welding holes 124 and a first fixing block 132 having the same number of first fixing holes 125, and the blocking block 131 and the first fixing block 132 are integrally formed on the fixed shell 13. The number of the blocking blocks 131 is consistent with the number of welding grooves, and each blocking block 131 is respectively embedded in a different welding hole 124.

[0046] Reference Figure 4 , Figure 6 , each first fixing block 132 is respectively embedded in a different first fixing hole 125, and a connecting block 133 is integrally formed on a side of the first fixing block 132 away from the fixing shell 13, and the connecting block 133 is embedded in a different communicating hole 411. A second fixing block 134 is integrally formed on a side of the connecting block 133 away from the first fixing block 132, and each second fixing block 134 is respectively embedded in a different second fixing hole 126.

[0047] Reference Figure 2 , Figure 7 The secondary terminal row 3 includes a high-speed signal group 31 and two secondary remaining terminal groups 32, and 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 group 22 have the same plurality of signal terminals 211 and ground terminals 212 as the variable signal group 21 and the main remaining terminal group 22.

[0048] Reference Figure 3 , Figure 7 , a terminal seat 33 is provided on the high-speed signal group 31, and the terminal seat 33 is injection molded on the high-speed signal group 31. A plurality of auxiliary card blocks 331 are integrally formed on the terminal seat 33, and a plurality of auxiliary card slots 113 are provided on the main shell 11 corresponding to the auxiliary card blocks 331. The auxiliary terminal row 3, the terminal seat 33 and the isolation seat 34 are inserted into the main shell 11, and each main card block 122 is respectively engaged with a different auxiliary card block 331. An isolation seat 34 is inserted between the auxiliary terminal row 3 and the main terminal row 2, and the isolation seat 34 separates the main terminal row 2 from the auxiliary terminal row 3.

[0049] The implementation principle of Example 1 of the present 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. Example

[0050] Reference Figure 8 , the difference between this embodiment and embodiment 1 is that the variable signal group 21 is provided with a terminal seat 33 which is the same as that on the high-speed signal group 31, and the terminal seat 33 on the variable signal group 21 is integrally formed on the variable signal group 21. An anti-crosstalk member 35 is inserted between the main terminal row 2 and the auxiliary terminal row 3, and the anti-crosstalk member 35 includes a conductive strip 351, a plurality of conductive blocks 352, and a plurality of absorbing blocks 353. The conductive strip 351 is made of metal and can conduct electricity, the conductive block 352 is integrally formed on the conductive strip 351 with conductive plastic, and the absorbing block 353 is integrally formed on the conductive strip 351 with absorbing material. The conductive block 352 conflicts with the signal terminal 211 and the ground terminal 212 in the high-speed signal group 31, and the absorbing block 353 conflicts with the signal terminal 211 and the ground terminal 212 in the variable signal group 21.

[0051] The implementation principle of Example 2 of the present application is: the conductive block 352 can effectively improve the high-frequency crosstalk problem of the high-speed signal group 31, and the absorbing block 353 can effectively improve the crosstalk and resonance problems of the variable signal group 21. Example

[0052] The present application embodiment discloses a production process. Figure 8 , the production process includes the following steps: Main terminal installation: Install the main terminal row onto the main housing.

[0053] Common crust molding: The common crust is molded on the common crust by injection molding, and shell grooves, welding holes with the same number as the welding segments, first fixing holes with the same number as the connecting holes, and second fixing holes with the same number as the first fixing holes are formed on the common crust. Each welding hole is directly opposite to a different welding segment, each first fixing hole is connected with a different second fixing hole, and each connecting hole is connected with a different first fixing hole and second fixing hole.

[0054] Common ground assembly: first insert the positioning block into the positioning slot, each main card block is respectively engaged with the corresponding main card slot, each grounding terminal is respectively in contact with a different welding section, and then the grounding terminal is welded to the corresponding welding section.

[0055] Fixing shell molding: the fixing shell is molded in the shell groove by injection 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.

[0056] Auxiliary terminal installation: insert the auxiliary terminal row, terminal seat and isolation seat into the main shell, and each auxiliary card block is respectively engaged with different auxiliary card slots.

[0057] The implementation principle of a production process of an embodiment of the present application is: after the main shell is formed on the main terminal row, and the common shell is formed on the common ground sheet, the main shell and the common shell are assembled to connect and align the ground terminal with the welding section, which helps to align the welding terminal with the welding section. The welding groove guides the subsequent welding and limits the solder, which improves the simplicity and quality of welding. After welding, the common shell is injection molded to close the welding hole, further improving the structural stability of the welding section and the ground terminal.

[0058] Such an arrangement can greatly improve the simplicity of welding, the welding quality and the structural stability of the joint. Example

[0059] Common crust molding: The common crust is molded on the common ground sheet by injection molding.

[0060] Common ground assembly: Assemble the common ground shell to the main shell.

[0061] Fixed shell molding: The fixed shell is molded onto the main shell and the common shell by injection molding.

[0062] Main terminal group and sub-terminal group molding: The terminal base is molded on the variable signal group and the high-speed signal group by injection molding.

[0063] Anti-crosstalk component molding: firstly, the absorbing block is molded on the conductive strip by injection molding, and then the conductive block is molded on the conductive strip by injection molding; or First, the conductive block is formed on the conductive strip by injection molding, and then the absorbing block is formed on the conductive strip by injection molding.

[0064] Final assembly: Insert the main terminal block, auxiliary terminal block, terminal block and anti-crosstalk components into the main housing.

[0065] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in 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 comprises a common ground sheet (4), wherein the common ground sheet (4) is electrically connected to the main terminal block (2).

2. A high-speed electrical connector according to claim 1, characterized in that: 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 plate (4) is arranged on the common ground housing (12).

3. A high-speed electrical connector according to claim 2, 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).

4. A high-speed electrical connector according to claim 2, 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).

5. A high-speed electrical connector according to claim 3, characterized in that: 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 communicating hole (411) penetrating the common ground sheet (4) is provided on the common ground shell (12), the communicating hole being 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 communicating 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).

6. A high-speed electrical connector according to claim 1, characterized in that: The invention also comprises an anti-crosstalk component (35) and a secondary terminal block (3); the anti-crosstalk component (35) comprises 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) comprises a variable signal group (21); the secondary terminal block (3) comprises a high-speed signal group (31); the conductive block (352) contacts the high-speed signal group (31); and the absorbing block (353) contacts the variable signal group (21).

7. 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).

8. A production process according to claim 7, 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).

9. A production process according to claim 7, 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.

10. A production process according to claim 9, characterized in that: The step of forming the common shell (12) further comprises forming a welding hole (124) on the common shell (12), the common shell (4) comprises a plurality of welding sections (42), the step of forming the common shell (12) further comprises forming a welding hole (124) on the common shell (12), the welding hole (124) being directly opposite to 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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