Preparation method of connector

Abstract

The invention provides a preparation method of a connector. The preparation method comprises the following steps: sleeving a metal sleeve into a first axial preset position on the periphery of a cable from the front end of a terminal; then uniformly brushing the weaving wire and enabling the weaving wire to reversely sleeve the periphery of the metal sleeve, and sleeving the periphery of the cable with a die-casting shell from the front end of the cable until the die-casting shell reaches a second axial preset position; and then the metal sleeve drives the braided wires to be pushed out from the rear end of the terminal to the front end of the terminal until the braided wires are in contact with the rear end of the die-casting shell, so that braided wire materials can be saved, the shielding effect on unexpected signals can be realized through the braided wires reversely covering the die-casting shell, and the transmission stability of the expected signals is improved. Besides, the braided wires are reversely arranged between the inner wall of the metal sleeve and the outer edge of the die-casting shell, so that a radial gap between the inner wall of the metal sleeve and the outer edge of the die-casting shell can be filled, stable installation and positioning are ensured, unexpected radial deformation possibly caused in the installation and use process of the cable is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of signal connectors, and in particular to a method for preparing a connector. Background Art

[0002] The connector is composed of a pair of male and female plugs that plug into each other, and the transmission effect of signals or messages is achieved by plugging the male and female plugs into each other.

[0003] The preparation process of connectors in the prior art is often completed by combining automatic production on an assembly line with manual cooperation. However, the following defects and deficiencies still exist in actual use: 1) The pursuit of high automation in the assembly line often leads to rough cutting process and waste of raw materials, and at the same time, it cannot guarantee effective sealing packaging and signal shielding effects; 2) Installation and positioning often rely on the internal positioning structure of the shell, which makes it difficult to achieve a stable positioning effect; 3) During the installation process, radial clearance is easily generated between the metal sleeve, the housing and the cable, making it difficult to ensure installation stability and use effect; 4) Necessary inspection steps are missing after installation, so the installation effect and quality cannot be guaranteed.

[0004] Therefore, there is an urgent need to provide a method for preparing a connector to solve the defects and shortcomings in the above-mentioned prior art. Summary of the invention

[0005] In order to solve the defects and shortcomings in the prior art, the present invention provides a method for preparing a connector.

[0006] The specific scheme provided by the present invention is: A method for preparing a connector, characterized in that it comprises the following steps: S1: Strip the cable; S2: Crimp the terminal at the specified position of the cable; S3: Insert the metal sleeve from the front end of the terminal into the first axial preset position on the outer circumference of the cable; S4: evenly brush the braided wires and make them cover the outer periphery of the metal sleeve in reverse direction, and insert the die-cast housing from the front end of the cable into the outer periphery of the cable until it reaches the second axial preset position; S5: The metal sleeve drives the braided wire to be pushed out from the rear end of the terminal to the front end of the terminal, so that the braided wire is wrapped around the outer periphery of the die-cast shell until the metal sleeve contacts the rear end of the die-cast shell; S6: crimping metal sleeve; S7: insert the sealing ring into the groove on the front side of the die-cast housing; S8: Install the sealing ring anti-drop cap at the front end of the die-cast housing; S9: Rubberize the connection between the cable and the metal casing, and between the metal casing and the die-cast housing; S10: Perform appearance inspection and cross-section inspection on the crimped connector.

[0007] As a further preferred embodiment of the present invention, the step S1 includes the following steps: S1.1: Preset the values ​​of the first, second and third axial lengths on the wire stripping machine; S1.2: Strip the cable using a wire stripping machine; S1.3: First, cut off the outer sheath so that the first axial length of the inner braided wire and aluminum foil exposed is L1; S1.4: Cut off the braided wire and aluminum foil again, so that the second axial length of the internal insulation part exposed is L2; And satisfy: L2<L1<2L2; S1.5: Cut off the insulation part again, so that the third axial length of the inner core wire exposed is L3; And it satisfies: 2L3<L2.

[0008] As a further preferred embodiment of the present invention, the step S2 includes the following steps: S2.1: Check the terminal size to ensure that the terminal size satisfies: the terminal axial length L4> the third axial length of the internal core wire exposed is L3, and the terminal outer diameter is larger than the core wire outer diameter and smaller than the insulation part outer diameter; S2.2: Insert the terminal into the outer periphery of the core wire, and make the large diameter part of the terminal cover the outer periphery of the insulating part, and the small diameter part of the terminal cover the outer periphery of the core wire; S2.3: Confirm that no core wire is exposed after the terminal is inserted; S2.4: Crimp the terminal so that the edge close to the crimping point of the insulating portion abuts against the end of the insulating portion; S2.5: Check whether the terminal cross section at the crimping position is cross-shaped; S2.6: Check whether the cross-sectional width of the terminal after crimping meets the preset requirements.

[0009] As a further preferred embodiment of the present invention, in step S3, the first axial preset position is a position where one end of the metal sleeve is located at the outer periphery of the sheath and the other end is flush with the end of the aluminum foil adjacent to the sheath; In the step S4, the second axial preset position is a position where the inner positioning portion of the die-cast housing abuts against the connection position between the large-diameter portion and the small-diameter portion of the terminal.

[0010] As a further preferred embodiment of the present invention, in step S4, before the die-cast housing is inserted into the outer periphery of the cable from the front end of the cable, it is confirmed that the aluminum foil has been radially expanded and there is a radial gap between the aluminum foil and the insulating part.

[0011] As a further preferred embodiment of the present invention, in step S5, the metal sleeve drives the braided wire from the rear end of the terminal to the front end of the terminal, so that the braided wire is covered on the outer periphery of the die-cast shell until the metal sleeve contacts the rear end of the die-cast shell. During this process, it is necessary to ensure that the braided wire cannot touch the terminal.

[0012] As a further preferred embodiment of the present invention, in step S6, the outer edge of the metal sleeve is crimped from a circle to a regular polygon.

[0013] As a further preferred embodiment of the present invention, in step S8, when the sealing ring anti-drop cap is installed at the front end of the die-cast housing, the following conditions need to be met: S8.1: The axial spacing between the front end of the terminal and the front end of the sealing ring anti-drop cap meets the preset requirements; S8.2: The axial distance between the front end of the terminal and the inner end of the die-cast housing meets the preset requirements.

[0014] As a further preferred embodiment of the present invention, in step S9, the encapsulation material is selected from the flame retardant material GEPBT DR48; and after the encapsulation is completed, the encapsulation position needs to be tested for air tightness and gaps; wherein, The air tightness test process is as follows: under an 8PSI air pressure environment, immerse the front end of the terminal in 1m deep water to test the air tightness. If there is no leakage at the encapsulation position within 30s, the air tightness test is deemed to be qualified; otherwise, the air tightness test is deemed to be unqualified. The gap detection includes: there is no gap between the outer edge of the connection position between the cable and the metal sleeve and the inner wall of the rubber coating.

[0015] As a further preferred embodiment of the present invention, in step S10, When performing visual inspection on the connector, the following steps are included: S10.1: Check the terminal shape for damage, burrs and deformation; S10.2: Check whether the core wire is exposed; S10.3: Check whether the axial distance between the terminal and the core wire meets the preset requirements; When performing cross-sectional inspection on a connector, the following steps are included: S10.4: Check whether there is a gap around the core wire; S10.5: Check whether the number of core wires meets the preset requirements; S10.6: Check whether the crimping width at each position meets the preset requirements.

[0016] Compared with the prior art, the present invention can achieve the following technical effects: 1) The present invention provides a method for preparing a connector, which comprises the following steps: inserting a metal sleeve from the front end of a terminal into a first axial preset position on the outer circumference of a cable; then evenly brushing the braided wire and making the braided wire reversely sleeved on the outer circumference of the metal sleeve, inserting a die-cast shell from the front end of the cable into the outer circumference of the cable until it reaches a second axial preset position; then pushing the braided wire from the rear end of the terminal to the front end of the terminal with the metal sleeve until it contacts the rear end of the die-cast shell. On the one hand, the braided wire material can be saved, and on the other hand, the braided wire reversely covering the die-cast shell can achieve a shielding effect on unexpected signals, thereby improving the transmission stability of expected signals; in addition, by reversely arranging the braided wire between the inner wall of the metal sleeve and the outer edge of the die-cast shell, the radial gap between the inner wall of the metal sleeve and the outer edge of the die-cast shell can also be filled, thereby ensuring stable installation and positioning, while avoiding unexpected radial deformation effects that may be caused to the cable during installation and use, thereby extending the service life.

[0017] 2) The present invention provides a method for preparing a connector, which simultaneously realizes the axial installation positioning effect with the die-cast shell by relying on the connection position between the outer sheath and the aluminum foil, the connection position between the aluminum foil and the insulating part, and the connection position between the large diameter part and the small diameter part of the terminal, thereby further ensuring accurate and stable positioning.

[0018] 3) The present invention provides a method for preparing a connector, which ensures that the aluminum foil has been radially expanded and has a radial spacing with the insulating part before the die-cast shell is inserted from the front end of the cable into the outer periphery of the cable. Thus, on the one hand, the radially expanded aluminum foil can reduce the radial gap between the metal sleeve and the shell and the cable to ensure stable installation and positioning. At the same time, the radially expanded aluminum foil can also prevent the outer braided wire from contacting the internal terminal to ensure stable signal transmission.

[0019] 4) The present invention provides a method for preparing a connector, by performing air tightness test, gap detection, appearance detection and profile detection on the connector respectively, so as to further ensure that the air tightness, appearance, internal gap and profile of the connector meet the preset requirements, thereby ensuring the installation and use effect of the connector and ensuring its signal transmission effect and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the connector provided by the present invention.

[0021] Figure 2 This is a structural diagram of the connector provided by the present invention.

[0022] Figure 3 A sectional side view of the connector provided by the present invention.

[0023] Figure 4 It is a structural schematic diagram of step S1 of the present invention.

[0024] Figure 5 It is a structural schematic diagram of step S2 of the present invention.

[0025] Figure 6 It is a cross-sectional schematic diagram of the terminal after crimping of the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of the terminal after crimping of the present invention.

[0027] Figure 8 It is a structural schematic diagram of step S5 of the present invention.

[0028] Fig. 9 It is a structural schematic diagram of step S6 of the present invention.

[0029] Fig.10 It is a structural schematic diagram of step S7 of the present invention.

[0030] Fig.11 It is a structural side view of step S7 of the present invention.

[0031] Fig.12 It is a side view of the structure in step S8 of the present invention.

[0032] Fig.13 for Fig.12 A cross-sectional view of the structure inside the middle sealing ring anti-drop cap.

[0033] Fig.14 It is a side view of the structure in step S9 of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] [First embodiment] like Figure 1-3 The figure shows a connector, which includes a rubber coating 1, a sealing ring 2, a die-cast shell 3, a terminal 4, a cable 5, a metal sleeve 6 and a rubber coating 7. The front end of the cable 5 is connected to the terminal 4, the cable 5 and the terminal 4 are inserted into the die-cast shell 3, the rear ends of the cable 5 and the die-cast shell 3 are covered with the rubber coating 7, and a metal sleeve 6 is also sleeved between the cable 5, the die-cast shell 3 and the rubber coating 7.

[0038] like Figure 4 As shown, the cable 5 in this embodiment includes an outer sheath 51, a braided wire 52 and an aluminum foil 53 from the outside to the inside, an insulating portion 54 is provided inside the aluminum foil 53, and a core wire 55 is provided inside the insulating portion. like Figure 5 As shown, in this embodiment, the front end of the core wire is crimped with a terminal 4, and the terminal 4 includes a terminal large diameter portion 41 close to the outer sheath 51 and a terminal small diameter portion 42 away from the outer sheath 51.

[0039] like Figure 4-14 A method for preparing a connector according to a first embodiment of the present invention is shown, comprising the following steps: S1: Strip the cable; Figure 4 As shown, the following steps are included: S1.1: The values ​​of the first, second and third axial lengths are preset on the wire stripping machine, so as to realize accurate control of the wire stripping length through the wire stripping machine, and avoid defects such as unexpected errors that may be caused by manual wire stripping. The preset values ​​of the first, second and third axial lengths can be determined through empirical data, and can be corrected and optimized through the subsequent error comparison process after multiple uses, so as to further improve the wire stripping accuracy of the wire stripping machine; S1.2: Strip the cable using a wire stripping machine; S1.3: First, the outer sheath 51 is cut off, so that the first axial length of the exposed inner braided wire 52 and the aluminum foil 53 is L1. The exposed inner braided wire 52 is convenient for the subsequent reverse outer sheath, and the exposed aluminum foil 53 is convenient for axial positioning of the die-cast housing 3, and also convenient for providing space for the subsequent radial expansion of the aluminum foil; S1.4: Cut off the braided wire 52 and the aluminum foil 53 again, so that the second axial length of the exposed internal insulating portion 54 is L2, so as to facilitate the axial tightening effect when the subsequent die-cast housing 3 is axially inserted; And satisfy: L2<L1<2L2; This is because it is necessary to reserve axial space for the axial tightening effect, so it is necessary to set the second axial length L2<first axial length L1, but at the same time, the reserved axial space should not be too long to avoid the inconvenience caused by the too long tightening space during the loading and unloading process; S1.5: Cut off the insulating portion 54 again, so that the third axial length of the inner core wire 55 exposed is L3, so as to facilitate the subsequent installation and positioning of the terminal; And it satisfies: 2L3<L2, the axial length of the exposed core wire should not be too long. On the one hand, since the terminal 4 to be crimped subsequently can extend its length, the axial length of the exposed core wire does not need to be set too long; on the other hand, too long axial length of the exposed core wire may also affect the terminal crimping process, such as the core wire being difficult to insert or unexpectedly breaking during the crimping process.

[0040] S2: Crimp the terminal at the specified position of the cable; Figure 5 As shown, the following steps are included: S2.1: Check the size of terminal 4 so that the size of terminal 4 satisfies: the axial length of terminal L4> the third axial length of the exposed internal core wire L3, so as to extend the axial length of the internal core wire through the axial length of terminal 4, and at the same time ensure that the internal core wire can be completely axially covered by the terminal, and the outer diameter of the terminal is larger than the outer diameter of the core wire and smaller than the outer diameter of the insulating part, so as to ensure that the terminal can completely cover the internal core wire in the radial direction without hindering the subsequent axial loading of the die-cast housing 3; S2.2: The terminal is inserted into the outer periphery of the core wire, and the large diameter portion 41 of the terminal is sleeved on the outer periphery of the insulating portion, and the small diameter portion 42 of the terminal is sleeved on the outer periphery of the core wire. While the core wire portion is completely covered, the axial positioning effect of the terminal 4 during axial installation can be achieved through the axial abutment between the connection position of the large diameter portion 41 and the small diameter portion 42 of the terminal and the connection position of the insulating portion and the core wire. In addition, it is also convenient to fix the terminal 4 on the outer periphery of the insulating portion; S2.3: Confirm that there is no exposed core wire after the terminal is inserted to ensure that the core wire is completely inside the terminal 4, thereby ensuring accurate connection and stable signal transmission; S2.4: crimp the terminal so that the edge of the crimping point 43 close to the insulating part abuts against the end of the insulating part; thereby further improving the fixing stability of the terminal 4 on the periphery of the core wire. As a further preferred embodiment of this embodiment, Figure 5 and Figure 7As shown, the crimping point in this embodiment is preferably configured to extend along the axial direction of the terminal 4 to further improve its fixing stability; S2.5: Check whether the terminal cross section at the crimping position is cross-shaped; Figure 6 As shown, the cross-section of the terminal after crimping in this embodiment is preferably a cross-shape, and the purpose of this setting is: 1) the cross-shaped cross-section can effectively increase the outer edge contact area of ​​the terminal 4, which is conducive to the stability of the plugging during the plugging process, and is also conducive to the ventilation and heat dissipation effect when not plugged; 2) the cross-shaped cross-section is more convenient for stable holding than the circular cross-section, so as to avoid the unexpected rolling condition that may be caused when the circular cross-section is placed; 3) at the same time, the cross-shaped cross-section is also convenient for the crimping process; 4) in addition, the outer edges of the cross-shaped cross-section are all set to arc shapes, which is also convenient for the flow of moisture and impurity particles, and is not conducive to the retention and accumulation of particles such as moisture and impurities, thereby effectively improving the waterproof and dustproof effects; S2.6: Check whether the cross-sectional width of the terminal after crimping meets the preset requirements, so as to facilitate the subsequent axial installation and positioning of the die-cast housing 3.

[0041] S3: insert the metal sleeve from the front end of the terminal into the first axial preset position on the outer periphery of the cable. In this embodiment, the first axial preset position is a position where one end of the metal sleeve is located on the outer periphery of the sheath and the other end is flush with the end of the aluminum foil adjacent to the sheath, so as to facilitate the subsequent reverse sheathing action of the braided wire and also realize the axial positioning effect of the die-cast housing 3 that is subsequently axially installed; S4: Brush the braided wires evenly and make them cover the outer periphery of the metal sleeve in the reverse direction, and insert the die-cast housing from the front end of the cable into the outer periphery of the cable until it reaches the second axial preset position. In this embodiment, the second axial preset position is the position where the inner positioning part of the die-cast housing abuts against the connection position of the large diameter part and the small diameter part of the terminal, and the axial positioning installation effect of the die-cast housing 3 relative to the terminal 4 is achieved through the abutment position; It is worth noting that in this step, before the die-cast housing is put into the outer periphery of the cable from the front end of the cable, it is confirmed that the aluminum foil has been radially expanded and there is a radial gap with the insulating part. On the one hand, the radially expanded aluminum foil can reduce the radial gap between the metal sleeve and the housing and the cable to ensure stable installation and positioning. At the same time, the radially expanded aluminum foil can also prevent the outer braided wire from contacting the internal terminal to ensure stable signal transmission. S5: The metal sleeve drives the braided wire to be pushed out from the rear end of the terminal to the front end of the terminal, so that the braided wire is wrapped around the outer periphery of the die-cast shell until the metal sleeve contacts the rear end of the die-cast shell. Figure 8 As shown; in this process, it is necessary to ensure that the braided wire does not touch the terminal, so as to minimize the adverse effects of the braided wire on the signal transmission effect and stability; By inserting the metal sleeve from the front end of the terminal into the first axial preset position on the outer circumference of the cable; then evenly brushing the braided wire and making the braided wire reversely sleeved on the outer circumference of the metal sleeve, inserting the die-cast shell from the front end of the cable into the outer circumference of the cable until it reaches the second axial preset position; then the metal sleeve drives the braided wire to be pushed out from the rear end of the terminal to the front end of the terminal until it contacts the rear end of the die-cast shell. On the one hand, the braided wire material can be saved, and on the other hand, the braided wire that is reversely covered on the die-cast shell can achieve a shielding effect on unexpected signals, thereby improving the transmission stability of expected signals; in addition, by reversely setting the braided wire between the inner wall of the metal sleeve and the outer edge of the die-cast shell, the radial gap between the inner wall of the metal sleeve and the outer edge of the die-cast shell can also be filled, thereby ensuring stable installation positioning, while avoiding unexpected radial deformation effects that may be caused by the cable during installation and use, thereby extending the service life.

[0042] S6: Crimping metal sleeve, such as Fig. 9 As shown, specifically, the outer edge of the metal sleeve is crimped from a circle to a regular polygon, and in this embodiment, it is crimped to a regular hexagon. Compared with the circular outer edge structure, it has the following advantages: 1) The hexagonal structure has stronger stability, which can ensure the firmness and stability of the connection between the metal sleeve 6 and the subsequent rubber coating 7; 2) At the same time, the hexagonal crimping can achieve a close connection between the parts, reducing the possibility of the metal sleeve 6 loosening and shaking inside the rubber coating 7; 3) The process of hexagonal crimping is relatively simple, and only appropriate tools and pressure are needed to complete the connection; 4) In addition, compared with other connection methods, the cost of hexagonal crimping is relatively low, which is suitable for mass production; S7: Insert the sealing ring into the groove on the front side of the die-cast housing, such as Figure 10-11 As shown, the internal sealing effect of the connector is further improved; S8: Install the sealing ring anti-drop cap at the front end of the die-cast housing, such as Fig.12 As shown in the figure, when the sealing ring anti-drop cap is installed at the front end of the die-cast housing, the following conditions need to be met: S8.1: The axial spacing Z1 between the front end of the terminal and the front end of the sealing ring anti-drop cap meets the preset requirements; by setting the axial spacing Z1, the internal terminal and the inner end of the die-cast housing are protected from unexpected collision damage to the internal terminal and the inner end of the die-cast housing caused by the external plug connector or other objects; S8.2: The axial distance Z2 between the front end of the terminal and the inner end of the die-cast housing meets the preset requirements; by setting the axial distance Z2, unexpected damage to the internal terminal 4 that may be caused during misconnection with other plug connectors can be avoided.

[0043] S9: Rubberize the connection between the cable and the metal casing, and between the metal casing and the die-cast housing; In this embodiment, the encapsulation material is the flame retardant material GE PBT DR48; and after the encapsulation is completed, the encapsulation position needs to be tested for air tightness and gaps; wherein, The air tightness test process is as follows: Under an 8PSI air pressure environment, immerse the front end of the terminal in 1m deep water to test the air tightness. If there is no leakage at the encapsulation position within 30s, the air tightness test is considered qualified; otherwise, the air tightness test is considered unqualified. Gap detection includes: there is no gap between the outer edge of the connection position between the cable and the metal sleeve and the inner wall of the rubber sleeve.

[0044] S10: Perform appearance inspection and profile inspection on the crimped connector: When performing visual inspection on the connector, the following steps are included: S10.1: Check the terminal shape for damage, burrs and deformation; S10.2: Check whether the core wire is exposed; S10.3: Check whether the axial distance between the terminal and the core wire meets the preset requirements; When performing cross-sectional inspection on a connector, the following steps are included: S10.4: Check whether there is a gap around the core wire; S10.5: Check whether the number of core wires meets the preset requirements; S10.6: Check whether the crimping width at each position meets the preset requirements.

[0045] By performing air tightness test, gap test, appearance test and profile test on the connector respectively, we can further ensure that the air tightness, appearance, internal gap and profile of the connector meet the preset requirements, thereby ensuring the installation and use effect of the connector and ensuring its signal transmission effect and stability.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a connector, characterized in that: The following steps are involved: S1: Strip the cable; S2: Crimp the terminal at the specified position of the cable; S3: Insert the metal sleeve from the front end of the terminal into the first axial preset position on the outer circumference of the cable; S4: evenly brush the braided wires and make them cover the outer periphery of the metal sleeve in reverse direction, and insert the die-cast housing from the front end of the cable into the outer periphery of the cable until it reaches the second axial preset position; S5: The metal sleeve drives the braided wire to be pushed out from the rear end of the terminal to the front end of the terminal, so that the braided wire is wrapped around the outer periphery of the die-cast shell until the metal sleeve contacts the rear end of the die-cast shell; S6: crimping metal sleeve; S7: insert the sealing ring into the groove on the front side of the die-cast housing; S8: Install the sealing ring anti-drop cap at the front end of the die-cast housing; S9: Rubberize the connection between the cable and the metal casing, and between the metal casing and the die-cast housing; S10: Perform appearance inspection and cross-section inspection on the crimped connector.

2. A method for preparing a connector according to claim 1, characterized in that: The step S1 includes the following steps: S1.1: Preset the values ​​of the first, second and third axial lengths on the wire stripping machine; S1.2: Strip the cable using a wire stripping machine; S1.3: First, cut off the outer sheath so that the first axial length of the inner braided wire and aluminum foil exposed is L1; S1.4: Cut off the braided wire and aluminum foil again, so that the second axial length of the internal insulation part exposed is L2; And satisfy: L2<L1<2L2; S1.5: Cut off the insulation part again, so that the third axial length of the inner core wire exposed is L3; And it satisfies: 2L3<L2.

3. A method for preparing a connector according to claim 2, characterized in that: The step S2 includes the following steps: S2.1: Check the terminal size to ensure that the terminal size satisfies: the terminal axial length L4> the third axial length of the internal core wire exposed is L3, and the terminal outer diameter is larger than the core wire outer diameter and smaller than the insulation part outer diameter; S2.2: Insert the terminal into the outer periphery of the core wire, and make the large diameter part of the terminal cover the outer periphery of the insulating part, and the small diameter part of the terminal cover the outer periphery of the core wire; S2.3: Confirm that no core wire is exposed after the terminal is inserted; S2.4: Crimp the terminal so that the edge close to the crimping point of the insulating portion abuts against the end of the insulating portion; S2.5: Check whether the terminal cross section at the crimping position is cross-shaped; S2.6: Check whether the cross-sectional width of the terminal after crimping meets the preset requirements.

4. A method for preparing a connector according to claim 3, characterized in that: In step S3, the first axial preset position is a position where one end of the metal sleeve is located at the outer periphery of the sheath and the other end is flush with the end of the aluminum foil adjacent to the sheath; In the step S4, the second axial preset position is a position where the inner positioning portion of the die-cast housing abuts against the connection position between the large-diameter portion and the small-diameter portion of the terminal.

5. The method for preparing a connector according to claim 3, characterized in that: In the step S4, before the die-cast housing is inserted into the outer periphery of the cable from the front end of the cable, it is confirmed that the aluminum foil has been radially expanded and there is a radial gap between the aluminum foil and the insulating part.

6. The method for preparing a connector according to claim 1, characterized in that: In step S5, the metal sleeve drives the braided wire to be pushed out from the rear end of the terminal to the front end of the terminal, so that the braided wire is wrapped around the outer periphery of the die-cast shell until the metal sleeve contacts the rear end of the die-cast shell. It is necessary to ensure that the braided wire cannot touch the terminal.

7. The method for preparing a connector according to claim 1, characterized in that: In the step S6, the outer edge of the metal sleeve is crimped from a circle to a regular polygon.

8. The method for preparing a connector according to claim 1, characterized in that: In step S8, when the sealing ring anti-drop cap is installed at the front end of the die-cast housing, the following conditions need to be met: S8.1: The axial spacing between the front end of the terminal and the front end of the sealing ring anti-drop cap meets the preset requirements; S8.2: The axial distance between the front end of the terminal and the inner end of the die-cast housing meets the preset requirements.

9. The method for preparing a connector according to claim 1, characterized in that: In step S9, the encapsulation material is flame retardant material GE PBT DR48; and after the encapsulation is completed, the encapsulation position needs to be tested for air tightness and gaps; wherein, The air tightness test process is as follows: under an 8PSI air pressure environment, immerse the front end of the terminal in 1m deep water to test the air tightness. If there is no leakage at the encapsulation position within 30s, the air tightness test is deemed to be qualified; otherwise, the air tightness test is deemed to be unqualified. The gap detection includes: there is no gap between the outer edge of the connection position between the cable and the metal sleeve and the inner wall of the rubber coating.

10. The method for preparing a connector according to claim 1, characterized in that: In the step S10, When performing visual inspection on the connector, the following steps are included: S10.1: Check the terminal shape for damage, burrs and deformation; S10.2: Check whether the core wire is exposed; S10.3: Check whether the axial distance between the terminal and the core wire meets the preset requirements; When performing cross-sectional inspection on a connector, the following steps are included: S10.4: Check whether there is a gap around the core wire; S10.5: Check whether the number of core wires meets the preset requirements; S10.6: Check whether the crimping width at each position meets the preset requirements.

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