Anti-dropping connector female head

Abstract

The application relates to an anti-falling connector female head which comprises an outer nut, an inner core and a rubber core, the outer nut is internally provided with a movable threaded part, the movable threaded part is internally provided with threads and can move relative to the outer nut, the right inner wall of the outer nut is internally provided with threads, the inner core is installed at the left part of the outer nut, the middle part of the inner core is provided with a first clamping ring, and the part of the inner core located at the right side of the first clamping ring is accommodated in the outer nut. The cross section of the clamping spring is improved into a square shape, the flat side of the clamping spring after assembly is in plane contact with the bottom wall of the groove, the adjacent side is in plane blocking cooperation with the side wall of the groove, the clamping spring with the square cross section is strictly limited in the groove and cannot roll or axially move, even in a long-time and high-frequency swing vibration environment, the clamping spring always keeps in the fixed position in the groove, the phenomenon that the outer nut falls from the inner core is fundamentally eliminated, and the swing fatigue life of the connector is improved to a reliable level.

Description

Technical Field

[0001] This invention belongs to the field of connector female head technology, specifically relating to an anti-detachment connector female head. Background Technology

[0002] In the field of electronic device interconnection, coaxial connectors with threaded locking structures are commonly used in communication equipment, testing instruments, aerospace, and industrial control applications where signal transmission stability is extremely important. These connectors typically consist of a plug (male) and a socket (female) for mating. Their typical structure includes an inner conductor, an insulating medium, an outer conductor (housing), and an outer nut screwed onto the outside of the housing for locking with the other connector.

[0003] After the final product is assembled, to simulate the stress on the cable caused by bending and pulling during actual use, the industry typically conducts a specified number of swing tests on the finished cable. When the cable assembly reached approximately 80,000 swing cycles, some samples showed that the outer nut at the plug end completely detached from the housing. Analysis revealed that in existing designs, the outer nut is usually axially limited by a limiting ring machined at the front end of the housing and a locking structure on the inner wall of the nut, with a clearance fit to ensure the nut can rotate freely. However, during continuous, high-frequency swinging, the repeated bending of the cable transmits periodic impact loads to the housing through the inner conductor and insulation medium, causing the housing to experience slight axial movement or radial deformation. When this movement exceeds the overlap between the limiting ring and the locking structure, the outer nut gradually detaches from the locking position and eventually completely unscrews and falls off under the combined action of the thread engagement force.

[0004] Furthermore, during normal insertion and removal operations, there are significant differences in the feel of turning the outer nut between different individuals and even within the same individual at different rotation angles; some samples have excessive rotational damping, requiring considerable effort to turn and easily causing operational fatigue; while others are too loose, exhibiting obvious radial wobble clearance. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides an anti-detachment connector female head, comprising an outer nut, an inner core, and a rubber core. The outer nut is provided with a movable threaded component, which has an internal thread and is movable relative to the outer nut.

[0006] The right inner wall of the outer nut is provided with internal threads;

[0007] The inner core is installed on the left side of the outer nut, and a first retaining ring is provided in the middle of the inner core. The portion of the inner core located to the right of the first retaining ring is accommodated inside the outer nut.

[0008] The inner core has an outer mold injection fastening position circumferentially located on the left side of the first retaining ring;

[0009] The rubber core is installed on the right inner side of the inner core. A second retaining ring is provided in the middle left part of the rubber core. The part of the rubber core located to the left of the second retaining ring is housed in the inner core, and the part of the rubber core located to the right of the second retaining ring is housed in the outer nut.

[0010] Multiple crown spring terminals are pressed onto the left side of the rubber core;

[0011] The outer right side of the inner core and the outer left side of the outer nut are respectively provided with grooves, and the retaining spring is embedded in the grooves;

[0012] The wave-shaped washer is sleeved on the inner core and is axially limited between the first retaining ring and the left end face of the outer nut;

[0013] The inner core is provided with multiple limiting steps on the right side of the first retaining ring in the circumferential direction, and the inner edge of the wave-shaped gasket is engaged with the limiting steps;

[0014] The inner core has a locking structure on its left side for securing the cable.

[0015] Preferably, the movable threaded part is embedded in the middle inner wall of the outer nut.

[0016] Preferably, the number of limiting steps is four, and the four limiting steps are evenly distributed along the circumference of the inner core.

[0017] Preferably, the retaining ring is an open, perfectly circular stainless steel wire.

[0018] Preferably, the outer diameter of the wave gasket is 17.5 mm, and the distance H between the crest and trough of the wave gasket is 1.2 ± 0.05 mm.

[0019] Preferably, the right end face of the rubber core protrudes 1 mm beyond the right end face of the outer nut.

[0020] Preferably, the inner core has a plurality of glue-filling holes circumferentially arranged, and the diameter of the glue-filling holes is 3.5mm.

[0021] Preferably, the left end of the inner core extends outward with a semi-circular plate, and the locking structure includes: threaded holes symmetrically opened on the semi-circular plate, a nut installed in the threaded hole, and the wire clamp being arched with its two ends respectively connected to the nut.

[0022] Preferably, the crown spring terminal has a double crown spring structure.

[0023] Preferably, the material of the crown spring terminal is beryllium copper.

[0024] Another aspect of the present invention provides a testing method for an anti-detachment connector female head, comprising the following steps:

[0025] S01 performs a visual inspection of the anti-disengagement connector female head to confirm that it is free of cracks, burrs and deformation defects.

[0026] S02 Connect the anti-detachment connector female head to the matching male head, measure and record the maximum insertion force value;

[0027] S03 After locking the anti-detachment connector female head and the matching male head, apply a tensile force in the axial direction, measure and record the initial pull-out force value;

[0028] S04 After repeatedly inserting and locking the anti-detachment connector female head and the matching male head N times, measure and record the attenuated pull-out force value again.

[0029] S05 calculates the attenuation rate between the attenuated pull-out force value and the initial pull-out force value. If the attenuation rate does not exceed a preset threshold, it is determined to be qualified.

[0030] Preferably, the value of N ranges from 10 to 100, and the preset threshold is 20%.

[0031] Preferably, the test also includes a cable sway test step.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This invention improves the cross-section of the retaining spring to a square shape. After assembly, the flat side of the retaining spring forms a planar fit contact with the bottom wall of the groove, and the adjacent side forms a planar blocking fit with the side wall of the groove. The square-section retaining spring is strictly restricted from rolling or axial movement in the groove. Even under long-term, high-frequency swaying vibration, the retaining spring always remains in a fixed position in the groove, fundamentally eliminating the phenomenon of the outer nut falling off the inner core and improving the connector's anti-sway fatigue life to a reliable level.

[0034] This invention precisely shapes the waveform height of the wave gasket to 1.2±0.05mm. The reduced H value decreases the stiffness of the wave gasket and makes its elastic characteristics more gentle. Under the same assembly compression, the rate of change of elastic force is more gradual, and the preload will not change drastically due to small fluctuations in assembly dimensions. At the same time, a precision progressive die is used and a waveform shaping station is added to the die to ensure that the waveform height of each wave gasket is precisely controlled within the target range during mass production. All products obtain a consistent resistance torque when the outer nut is tightened, that is, the twisting feel is highly consistent, which effectively eliminates the problem of inconsistent feel reported by customers and significantly improves the product quality and user experience.

[0035] This invention uses an arched clamp to evenly press the cable onto the surface of a semi-circular plate, providing uniform clamping force without damaging the cable insulation layer. When the cable is subjected to axial tension, the tension is directly borne by the locking device and blocked at the connector entrance, preventing it from being transmitted to the internal solder joints or crimping points, thus effectively protecting the integrity of the internal electrical connections.

[0036] This invention features multiple circumferentially distributed limiting steps on the inner core. After the wave-shaped gasket is fitted onto the inner core, its inner edge engages with the limiting steps, applying circumferential rotational constraint to the wave-shaped gasket and preventing it from rotating circumferentially on the inner core. By using the limiting steps to dual position the wave-shaped gasket in both the circumferential and radial directions, the locking failure problem caused by gasket displacement is completely eliminated, ensuring that the wave-shaped gasket is always in the designed working position and maintains a uniform and stable axial preload function over a long period of time.

[0037] This invention not only optimizes the specifications of the injection hole, but also adds an outer mold injection fastener to the inner core. After the injection material is cured, an embedded mechanical locking structure is formed in the fastener area. Even if the bonding interface gradually fails due to long-term bending, the mechanical locking force provided by the fastener can still firmly fix the outer mold to the inner core. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0039] Figure 2 This is a cross-sectional view of the present invention;

[0040] Figure 3 This is an exploded view of the present invention;

[0041] Figure 4 This is a three-dimensional structural diagram of the inner core in this embodiment;

[0042] Figure 5 This is a three-dimensional structural diagram of the adhesive core in this embodiment;

[0043] Figure 6 This is a three-dimensional structural diagram of the outer nut in this embodiment;

[0044] Figure 7 This is a three-dimensional structural diagram of the waveform pad in this embodiment;

[0045] Figure 8 This is a flowchart illustrating the testing process for the anti-detachment connector female in this embodiment.

[0046] The numbers in the diagram are: 1-outer nut, 2-inner core, 3-plastic core, 4-movable threaded part, 5-first retaining ring, 6-outer mold injection buckle, 7-second retaining ring, 8-crown spring terminal, 9-groove, 10-retaining spring, 11-wave wave washer, 12-limiting step, 13-locking structure, 131-threaded hole, 132-nut, 134-wire clamp, 14-semi-circular plate, 15-glue hole. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Example 1

[0049] like Figures 1 to 7 The anti-detachment connector female shown is composed of three core components: outer nut 1, inner core 2, and rubber core 3, which are sequentially fitted together along the axial direction.

[0050] The outer nut 1 is located in the outermost layer and is used to provide an external threaded connection interface and a gripping and tightening part for the operator; the inner core 2 is located in the middle layer and is used to serve as the structural skeleton of the entire connector, while also providing a carrier for cable fixing and injection molding connection; the rubber core 3 is located in the innermost layer and is used to house and position the crown spring terminal 8 to ensure stable transmission of signals or current; the three are nested from left to right to form a coaxial multi-layered fitting structure, and the axial and circumferential positioning is achieved between each layer through structures such as snap rings 10, snap rings, and limiting steps 12.

[0051] Specifically, the inner core 2 is installed on the inner left side of the outer nut 1. The main body of the inner core 2 extends axially to the right and into the inner cavity of the outer nut 1. The right end of the inner core 2 is inserted into the outer nut 1 and forms a plug-in fit with the rubber core 3. The rubber core 3 is installed on the inner right side of the inner core 2, that is, the left part of the rubber core 3 is inserted into the inner hole of the right end of the inner core 2, and the right part of the rubber core 3 extends further to the right and into the inner cavity of the right side of the outer nut 1, so that the rubber core 3 forms a nested relationship with both the inner core 2 and the outer nut 1. The outer nut 1 is sleeved on the periphery of the inner core 2 and the rubber core 3. The left end of the outer nut 1 is axially locked to the middle part of the inner core 2 by a snap ring 10. The right end of the outer nut 1 is detachably threaded to the external male connector through the internal thread provided on its inner wall.

[0052] The outer nut 1 has a cylindrical structure and an outer surface with external patterns or straight lines. The external patterns can be any of the following: mesh, diagonal, or straight lines. The purpose of these patterns is to increase the friction between the operator's fingers or tools and the outer surface of the nut 132, ensuring that the operator can obtain a reliable grip when turning it and avoiding problems such as incomplete turning or difficulty in operation due to hand slippage. The external patterns or straight lines are evenly distributed along the entire outer circumference of the outer nut 1, forming a continuous friction-enhancing area.

[0053] A groove 9 is provided on the outer left side of the outer nut 1. The groove 9 is an annular groove that extends continuously along the inner wall of the outer nut 1. The cross-sectional shape of the groove 9 is rectangular and is used to accommodate the retaining spring 10. It is the outer ring mounting position of the retaining spring 10. An internal thread is provided on the right inner wall of the outer nut 1. The internal thread is used to form a threaded engagement with the external thread on the external male connector to realize the detachable locking connection between the female and male connectors.

[0054] The outer nut 1 is also fitted with a movable threaded part 4. The movable threaded part 4 is in the shape of a ring and is fitted into the middle inner wall of the outer nut 1, that is, to the left of the internal thread on the right inner wall of the outer nut 1. The movable threaded part 4 has an internal thread that is compatible with the external thread of the external male connector. The movable threaded part 4 and the inner wall of the outer nut 1 are in a movable fit. That is, the movable threaded part 4 is not fixed to the inner wall of the outer nut 1, but can be slightly displaced relative to the outer nut 1 in the circumferential or radial direction within a certain range.

[0055] As described above, when the external male connector is screwed in, the movable threaded part 4 can automatically fine-tune its own angle position according to the insertion angle of the male thread, thereby eliminating possible jamming, jamming or thread interference during the thread engagement process, ensuring the smoothness and consistency of the threaded connection, and also avoiding the problem of uneven force on the external nut 1 due to excessive thread tightness, which may lead to deformation or damage. The movable threaded part 4 is made of wear-resistant metal material, and its internal thread surface is hardened to improve the wear resistance and anti-slipping ability of the thread, ensuring that the thread can still maintain good engagement accuracy after repeated insertion and removal.

[0056] The inner core 2 is divided into left, middle and right sections along the axial direction from left to right to accommodate the space requirements and functional needs of different assembly positions.

[0057] The groove 9 on the outer right side of the inner core 2 also has an annular groove 9, which extends continuously along the outer wall of the inner core 2. Its cross-sectional shape is rectangular or arc-shaped. The groove depth and groove width match the groove 9 on the outer nut 1, so that the snap ring 10 can be partially located in the groove 9 of the outer nut 1 and partially located in the groove 9 of the inner core 2 after being inserted, thereby forming a radially embedded axial locking relationship between the outer nut 1 and the inner core 2.

[0058] The inner core 2 has a first retaining ring 5 in the middle. The first retaining ring 5 is an annular flange structure that protrudes radially outward along the outer wall of the inner core 2. Its outer diameter is larger than the outer diameter of the left part of the inner core 2 and also larger than the outer diameter of the right part of the inner core 2. The part of the inner core 2 located to the right of the first retaining ring 5 is housed inside the outer nut 1. That is, the right part and the right side of the middle part of the inner core 2 are located in the inner cavity of the outer nut 1 after the outer nut 1 is assembled, and are protected and constrained by the outer nut 1. The part of the inner core 2 located to the left of the first retaining ring 5 is exposed outside the outer nut 1. This part is used to connect cables and injection molds.

[0059] The inner core 2 has an outer mold injection fastening position 6 circumferentially opened on the left side of the first retaining ring 5. The outer mold injection fastening position 6 is specifically an annular groove opened on the outer wall of the inner core 2. When the outer mold (i.e. the injection sheath at the end of the cable) is injection molded on the left side of the inner core 2, the injection material will fill the recessed area of ​​the outer mold injection fastening position 6 or cover the fastening ribs in the flowing state. After the injection material is cured, a mechanical hook-and-lock relationship is formed between the outer mold and the inner core 2, rather than relying solely on the adhesive force between the injection material and the surface of the inner core 2. This can effectively prevent the outer mold from separating or delaminating from the inner core 2 due to repeated bending or pulling during use, and eliminate the phenomenon of cracks appearing at the root of the inner core 2 after long-term use of the injection molded outer mold, significantly improving the bending fatigue life at the cable exit.

[0060] The inner core 2 is provided with multiple limiting steps 12 on the right side of the first retaining ring 5. The specific form of the limiting steps 12 is a platform radially cut from the outer wall of the inner core 2. There are four limiting steps 12, and the four limiting steps 12 are evenly distributed along the circumference of the inner core 2, which together constitute the circumferential positioning structure of the wave pad 11. When the wave pad 11 is sleeved on the inner core 2, the inner edge of the wave pad 11 and the four limiting steps 12 form a snap-fit ​​engagement. The limiting steps 12 are embedded in the corresponding recesses of the inner edge of the wave pad 11 or abut against the protrusions of the inner edge of the wave pad 11, thereby applying circumferential rotational constraint to the wave pad 11 and preventing the wave pad 11 from rotating circumferentially on the inner core 2. Meanwhile, the uniform distribution of the four limiting steps 12 along the circumference ensures that the corrugated gasket 11 is subjected to balanced force in the circumference direction, and will not cause the corrugated gasket 11 to tilt or get stuck due to uneven load. In this way, the dual positioning of the corrugated gasket 11 in the circumference and radial directions by the limiting steps 12 completely eliminates the locking failure problem caused by the displacement of the corrugated gasket 11, and ensures that the corrugated gasket 11 is always in the designed working position.

[0061] The inner core 2 has a mounting hole on the right side for accommodating the rubber core 3. The mounting hole is a circular through hole with an inner diameter that matches the outer diameter of the left side of the rubber core 3, allowing the rubber core 3 to be inserted into the mounting hole of the inner core 2 with an appropriate interference fit. The bottom of the mounting hole has an axial positioning surface for axially limiting the second retaining ring 7 of the rubber core 3 when it is inserted, ensuring that the insertion depth of the rubber core 3 in the inner core 2 is accurate and consistent.

[0062] The inner core 2 has multiple injection holes 15 circumferentially oriented. These injection holes 15 penetrate the wall thickness of the inner core 2 radially, connecting the outer and inner walls of the inner core 2. The injection holes 15 have a specification of 6×3.5 mm, meaning a diameter of 3.5 mm. There are six injection holes 15, evenly distributed circumferentially around the inner core 2. The injection holes 15 are located on the section of the inner core 2 to the left of the first retaining ring 5, specifically at the axial position corresponding to the injection mold. When the outer mold is injection molded on the left outer side of the inner core 2, the molten injection material not only coats the outer surface of the inner core 2 but also flows into the inner core through the injection holes 15. The internal space of the inner core 2 forms glue columns within the glue-filling hole 15. After the injection molding material cools and solidifies, these glue columns act as anchoring pins embedded in the wall thickness of the inner core 2, locking the outer mold and the inner core 2 together in the radial direction. The structure of the glue-filling hole 15 significantly increases the adhesion between the outer mold and the inner core 2, enabling the glue columns to withstand shear force when the outer mold is subjected to axial tensile force or radial peeling force. This effectively prevents delamination or separation between the outer mold and the inner core 2, significantly enhancing the overall connection strength between the connector and the cable.

[0063] The left side of the inner core 2 is also provided with a locking structure 13, which is used to mechanically clamp and fix the cable passing through the inner core 2 to increase the axial pull resistance between the cable and the connector and prevent the cable from coming out of the connector when it is accidentally pulled.

[0064] A semicircular plate 14 extends outward from the left end of the inner core 2. The semicircular plate 14 is integrally formed with the main body of the inner core 2. The semicircular plate 14 has a semicircular plate structure, and its planar portion is perpendicular to the axial direction of the inner core 2. The outer diameter of the semicircular plate 14 is larger than the outer diameter of the main body of the inner core 2. The locking structure 13 specifically includes two threaded holes 131 symmetrically opened on the semicircular plate 14. The two threaded holes 131 are symmetrically distributed along the diameter direction of the semicircular plate 14, that is, they are located on the front and rear sides of the semicircular plate 14 respectively. The nut 132 is installed in the threaded hole 131. The wire clamp 134 has an arched structure, that is, the main body of the wire clamp 134 arches upward to form an arc-shaped channel for the cable to pass through. Through holes are opened at both ends of the wire clamp 134. The locking screw passes through the through hole and is screwed into the threaded hole 131 on the semicircular plate 14. It cooperates with the nut 132 to press and fix the two ends of the wire clamp 134 to the surface of the semicircular plate 14. When assembling the cable, first pass the cable through the arched channel of the clamp 134, and then tighten the locking screw. The clamp 134 is pressed down by the tension of the screw, and its arched top tightly presses the cable against the surface of the semi-circular plate 14 or the corresponding surface of the inner core 2, thereby achieving a firm clamping of the cable. The arched deformation of the clamp 134 provides a uniform clamping force, avoiding excessive local compression of the cable and damage to the cable insulation layer, while ensuring sufficient pull-out resistance.

[0065] The core 3 is injection molded from insulating material. The core 3 is divided into left, middle left and right parts along the axial direction from left to right. The outer diameter of each part changes in a stepped manner to adapt to different mating relationships with the inner core 2 and the outer nut 1.

[0066] The core 3 has a second retaining ring 7 on its left side. The second retaining ring 7 is an annular flange structure that protrudes radially outward along the outer wall of the core 3. Its outer diameter is larger than the outer diameter of the left side of the core 3 and also larger than the outer diameter of the right side of the core 3. The part of the core 3 located to the left of the second retaining ring 7 is housed inside the inner core 2. That is, the left side of the core 3 is fixed in the mounting hole at the right end of the inner core 2 by insertion. The part of the core 3 located to the right of the second retaining ring 7 is housed inside the outer nut 1. That is, after assembly, the right side of the core 3 extends further to the right after passing through the opening at the right end of the inner core 2 and extends into the inner cavity of the right side of the outer nut 1. An annular gap is formed between the outer wall of the right side of the core 3 and the inner wall of the right side of the outer nut 1. This annular gap is used to accommodate the space of the male insulator when the external male connector is inserted.

[0067] Five crown spring terminals 8 are crimped on the left side of the core 3 (i.e., the left end face of the core 3). The crown spring terminals 8 are conductive metal parts, and their left ends are pressed into the terminal mounting holes pre-drilled on the left end face of the core 3, and are fixedly connected to the core 3 by interference fit. The right ends of the crown spring terminals 8 extend into the core 3 and protrude from the inner wall of the core 3, and are used to form elastic electrical contact with the pins of the external male connector.

[0068] It should be noted that the outer diameter and mounting hole layout of the core 3 are configured to be compatible with the installation of up to sixteen crown spring terminals (i.e., the core base is shared by 2-core to 16-core specifications). By increasing or decreasing the number of crown spring terminals and adjusting their circumferential distribution, male connectors with different numbers of cores can be adapted.

[0069] The crown spring terminal 8 has a double crown spring structure, meaning that each crown spring terminal 8 has two crown spring contact rings spaced axially in the portion located in the inner hole of the rubber core 3. Each crown spring contact ring consists of multiple elastic spring sheets evenly distributed circumferentially. The spring sheets protrude outward from the main body of the crown spring terminal 8, forming arched contact protrusions. The two crown spring contact rings are distributed axially, providing two independent contact areas. Even if the spring sheets in one contact area experience elastic decay or poor contact due to long-term insertion and removal, the other contact area can still maintain a reliable electrical connection, thereby achieving contact redundancy and significantly improving contact reliability. Furthermore, the axial distribution of the two contact areas also increases the total contact length between the crown spring terminal 8 and the pin, reduces contact resistance, and improves current carrying capacity.

[0070] The crown spring terminal 8 is made of imported beryllium copper. Beryllium copper (BeCu) has excellent elastic limit, fatigue resistance and conductivity. It can still maintain good elastic recovery ability after repeated compression and rebound, ensuring that the crown spring terminal 8 can still apply sufficient contact pressure to the pin after hundreds of thousands of insertion and removal cycles, and maintain low and stable contact resistance.

[0071] After the core 3 is installed, its right end face protrudes about 1mm beyond the right end face of the outer nut 1. That is, the right end face of the core 3 extends about 1mm to the right axially relative to the right end face of the outer nut 1. Therefore, when the anti-disengagement connector female head of this solution is inserted with the external male connector, the right end face of the core 3 contacts the opposite connector first, prior to the right end face of the outer nut 1, ensuring that the signal terminal is electrically connected before the external thread is fully tightened. When it is pulled out and separated, the right end face of the core 3 disengages later than the right end face of the outer nut 1, ensuring that the electrical connection is finally broken only after the external thread has been untightened, avoiding the problem of signal interruption or poor contact caused by the terminal not being in contact during the thread tightening process.

[0072] During assembly, the retaining ring 10 is pre-installed into the retaining groove of the outer nut 1. At this time, the retaining ring 10 is in a free state, and part of its volume protrudes from the groove of the outer nut 1, that is, the inner ring of the retaining ring 10 protrudes from the inner wall surface of the outer nut 1. Then, the inner core 2 is pushed into the inner cavity of the outer nut 1 from the left end opening along the axial direction to the right.

[0073] During the advancement process, the outer wall of the right side of the inner core 2 first contacts the portion of the retaining spring 10 that protrudes from the inner wall of the outer nut 1. Since the outer diameter of the right side of the inner core 2 is larger than the inner diameter of the retaining spring 10 in its free state, the inner core 2 will exert an outward radial expansion force on the retaining spring 10 as it continues to advance, forcing the opening of the retaining spring 10 to open, and the circular diameter of the retaining spring 10 will expand accordingly. As the inner core 2 advances further to the right, when the groove 9 on the outer side of the right side of the inner core 2 moves to the position of the retaining spring 10, the radial expansion force on the retaining spring 10 disappears instantly, and the retaining spring 10 quickly returns to its original position and contracts due to its own elasticity. Its inner ring is embedded in the groove 9 of the inner core 2, while its outer ring remains in the groove 9 of the outer nut 1. At this point, the retaining spring 10 is simultaneously embedded in the groove 9 of the outer nut 1 and the groove 9 of the inner core 2, forming a radially embedded locking fit between the outer nut 1 and the inner core 2.

[0074] Since the retaining ring 10 is axially limited by the groove walls of the outer nut 1 groove 9 and the inner core 2 groove 9, the outer nut 1 and the inner core 2 can no longer generate axial relative displacement. That is, the outer nut 1 cannot be dislodged from the inner core 2 to the left, and the inner core 2 cannot be dislodged from the outer nut 1 to the right, thus achieving reliable axial locking between the two.

[0075] Example 2

[0076] like Figure 6 As shown, the snap ring 10 is an open circular stainless steel wire. That is, the snap ring 10 is made by bending a section of stainless steel wire with a circular cross-section into a perfect circle, with an opening at a certain position in the circle. This allows the snap ring 10 to undergo elastic deformation when subjected to radial force, and its circular diameter can be expanded or reduced. The snap ring 10 is made of stainless steel, which has good elasticity, corrosion resistance and fatigue life. The diameter of the circular cross-section, the diameter of the perfect circle and the width of the opening of the snap ring 10 are precisely designed according to the dimensions of the groove 9 of the outer nut 1 and the groove 9 of the inner core 2. This makes the outer diameter of the snap ring 10 slightly larger than the bottom diameter of the groove 9 of the outer nut 1 and slightly smaller than the bottom diameter of the groove 9 of the inner core 2 in the free state.

[0077] After the retaining ring 10 is inserted into the groove of the outer nut 1, the outer wall of the retaining ring 10 abuts against the bottom of the groove of the outer nut 1, and the opening of the retaining ring 10 is constrained by the groove wall of the outer nut 1, thus restricting the retaining ring 10 to a fixed circumferential position. At the same time, after the retaining ring 10 enters the groove, the groove wall of the groove forms a planar block against the retaining ring 10 in the axial direction. That is, the retaining ring 10 is clamped by the left and right groove walls of the groove in the axial direction and cannot move in any direction along the axial direction. This planar blocking structure ensures that the retaining ring 10 is always located between the groove of the outer nut 1 and the groove of the inner core 2 after assembly, and will not be displaced out of the groove due to vibration or impact.

[0078] Example 3

[0079] like Figure 6 and Figure 7 As shown, the wave-shaped gasket 11 has an overall annular thin sheet structure and is formed by stamping elastic metal material. The circumference of the wave-shaped gasket 11 is wavy, that is, the peaks and troughs are alternately arranged along the circumference. The peaks and troughs are transitioned by smooth inclined surfaces or arc surfaces, so that the wave-shaped gasket 11 can undergo elastic deformation like a spring when subjected to axial pressure, generating axial elastic force.

[0080] The wave-shaped washer 11 is sleeved on the inner core 2, specifically on the section of the inner core 2 located to the right of the first retaining ring 5. Axially, it is confined between the right end face of the first retaining ring 5 and the left end face of the outer nut 1. The right end face of the first retaining ring 5 serves as the axial limiting surface on the left side of the wave-shaped washer 11, and the left end face of the outer nut 1 serves as the axial limiting surface on the right side of the wave-shaped washer 11. When the outer nut 1 is assembled in place, the wave-shaped washer 11 is clamped between the first retaining ring 5 and the left end face of the outer nut 1 and is subjected to a certain axial pre-compression. The crests and troughs of the wave-shaped washer 11 undergo elastic deformation under this pre-compression state, applying an axial elastic thrust to the first retaining ring 5 and the left end face of the outer nut 1.

[0081] All wave gaskets 11 are continuously stamped using the same set of stamping dies, ensuring that all batches of wave gaskets 11 have completely consistent external dimensions and waveform parameters, eliminating dimensional deviations caused by die wear, material batch differences, or processing technology fluctuations.

[0082] Specifically, the outer diameter of the wave washer 11 is 17.5mm. After assembly, its outer edge with an outer diameter of 17.5mm does not exceed the outer contour surface of the outer nut 1, and a safe distance is left between it and the outer edge of the left end face of the outer nut 1. This ensures that the operator's fingers will not come into contact with the outer edge of the wave washer 11 when tightening the outer nut 1, thus avoiding the safety hazard of cutting fingers due to sharp edges or burrs on the washer.

[0083] The distance H between the crest and trough of the wave shim 11 is 1.2 ± 0.05 mm, that is, the axial wave height of the wave shim 11 is 1.2 mm, and the allowable manufacturing tolerance is ± 0.05 mm. This ensures that each wave shim 11 can generate a basically consistent elastic thrust under the same axial compression, thereby ensuring that the resistance torque of all products is consistent when the outer nut 1 is turned, that is, the turning feel is consistent.

[0084] Comparative Example 1

[0085] In the prior art, the retaining spring 10 is made of stainless steel wire with a perfectly circular cross-section, meaning the cross-section of the retaining spring 10 is circular. After assembly, when the circular retaining spring 10 is inserted between the groove 9 of the outer nut 1 and the groove 9 of the inner core 2, the contact between the retaining spring 10 and the groove wall of the groove 9 is a line contact or a very small area of ​​arc surface contact. When the connector is subjected to alternating impact loads or axial tension during use, the circular retaining spring 10 is prone to rolling or slight displacement within the groove 9, and its contact position with the groove wall changes continuously. With the extension of the usage time and the increase of the number of swings, the repeated compression of the groove wall by the circular retaining spring 10 can easily produce indentations or wear on the groove wall surface, causing the fit clearance between the retaining spring 10 and the groove 9 to gradually increase, eventually causing the retaining spring 10 to lose its effective axial limiting function, and the outer nut 1 is at risk of coming off the inner core 2 when subjected to axial tension.

[0086] This application improves the cross-sectional shape of the retaining spring 10 from a perfect circle to a square, that is, the retaining spring 10 is made of stainless steel wire with a square cross-section. When the square cross-section retaining spring 10 is inserted between the groove 9 of the outer nut 1 and the groove 9 of the inner core 2, one flat side of the retaining spring 10 forms a planar contact with the bottom wall of the groove 9, and the adjacent side of the retaining spring 10 forms a planar blocking fit with the side wall of the groove 9. Since the contact area between the planes is much larger than the line contact area of ​​the circular cross-section, the compressive stress on the retaining spring 10 in the groove 9 is dispersed over a larger area, effectively reducing the contact stress per unit area and significantly reducing the wear rate of the groove wall of the groove 9.

[0087] More importantly, when the square-section retaining spring 10 is subjected to axial tension in the groove 9, its flat side surface forms a planar barrier with the side wall of the groove 9. That is, the side wall of the groove 9 applies a normal constraint force to the side surface of the retaining spring 10, and the direction of this constraint force is perpendicular to the side surface of the retaining spring 10. Since the square section has four mutually perpendicular sides, the retaining spring 10 cannot roll in the groove 9, nor can it move axially. It is strictly restricted to a fixed position inside the groove 9. Even under long-term, high-frequency swaying vibration, the square-section retaining spring 10 always remains in the groove 9 and will not cause an increase in the fitting clearance due to rolling wear, thereby fundamentally preventing the outer nut 1 from falling off the inner core 2.

[0088] Comparative Example 2

[0089] In the prior art, the corrugated gasket 11 is formed using a common stamping die, and the distance H between the crest and trough of the corrugated gasket 11 is 1.5 ± 0.05 mm. In actual mass production, due to factors such as wear of the stamping die, fluctuations in material springback, and changes in stamping speed, the actual waveform height of the corrugated gasket 11 is distributed between 1.45 mm and 1.55 mm; the difference in waveform height between different batches of corrugated gaskets 11 is even more obvious, and even corrugated gaskets 11 at different positions within the same batch have significant dimensional deviations.

[0090] It is known that the waveform height of the wave shim 11 directly determines the magnitude of the elastic force it generates under the same axial compression. When the waveform height is too large (e.g., close to 1.55mm), the axial preload generated by the wave shim 11 after assembly is too large, the resistance torque felt by the operator when tightening the outer nut 1 is too large, and the torque feels too tight; when the waveform height is too small (e.g., close to 1.45mm), the axial preload generated by the wave shim 11 is too small, and the torque feels too loose; the inconsistent size of the wave shim 11 between different products of the same model leads to inconsistent torque feel, which seriously affects the customer's user experience and the consistency of product quality evaluation.

[0091] This application optimizes and adjusts the waveform height of the wave shim 11 by using a newly developed precision stamping die, and shapes the distance H between the peak and trough of the wave shim 11 from the original design of 1.5±0.05mm to 1.2±0.05mm.

[0092] The H value decreases from 1.5mm to 1.2mm, which means that under the same assembly compression, the elastic force change rate generated by the wave shim 11 with a lower wave height is more gradual. That is, the stiffness of the wave shim 11 is reduced and the elastic characteristics are more gentle. This allows the wave shim 11 to apply a more uniform and stable axial preload to the outer nut 1 after assembly, and will not cause drastic changes in preload due to small fluctuations in assembly dimensions, thereby improving the consistency of the torsion feel.

[0093] Secondly, the newly developed stamping die adopts a precision progressive die structure, and a waveform shaping station has been added to the die design. That is, after the waveform gasket 11 has completed the initial stamping, a finishing process is added to perform secondary correction on the peaks and troughs of the waveform gasket 11, ensuring that the waveform height of each waveform gasket 11 is precisely controlled within the target range of 1.2±0.05mm. At the same time, the new die has been optimized in terms of material springback compensation, die clearance control and stamping speed stability, which greatly reduces the dimensional dispersion between different gaskets in mass production. Each waveform gasket 11 has the same waveform height, thereby ensuring that all products have a consistent twisting feel when the outer nut 1 is screwed on.

[0094] Comparative Example 3

[0095] In the prior art, the inner core 2 has four potting holes 15, and the diameter of the potting holes 15 is 3.0mm, that is, the potting hole 15 has a specification of 4×3.0.

[0096] During injection molding of the outer mold, molten injection material flows into the internal space of the inner core 2 through four 3.0mm diameter injection holes 15. Due to the limited number and small diameter of the injection holes 15, the total amount of injection material flowing into the inner core 2 through the injection holes 15 is limited, resulting in a small total cross-sectional area of ​​the glue pillars formed within the injection holes 15 after solidification. When the connector is subjected to axial tension or the cable is accidentally pulled, the glue pillars need to withstand shear force to prevent the outer mold from detaching from the inner core 2. However, the total shear area of ​​the glue pillars provided by the four 3.0mm diameter injection holes 15 is limited. When the tension exceeds a certain value, the glue pillars may shear fracture, causing the outer mold to peel off from the inner core 2. In addition, the small diameter of the injection holes 15 provides greater flow resistance to the molten injection material during injection molding, making it difficult for the injection material to fully fill the depth of the injection holes 15. This can easily lead to air bubbles or incomplete filling defects within the holes, further reducing the structural strength of the glue pillars.

[0097] This application increases the number of potting holes 15 from four to six, and at the same time increases the diameter of the potting holes 15 from 3.0mm to 3.5mm, that is, the specifications of the potting holes 15 are optimized from 4×3.0 to 6×3.5.

[0098] The cross-sectional area of ​​a single potting hole 15 increased from π×(3.0 / 2)²≈7.07mm² to π×(3.5 / 2)²≈9.62mm², an increase of approximately 36%; the number of potting holes 15 increased from four to six, an increase of 50%.

[0099] Based on the combined calculations, the total cross-sectional area of ​​the glue-filling hole 15 increased from 4×7.07≈28.27mm² to 6×9.62≈57.72mm², more than doubling to approximately 104%.

[0100] During injection molding of the outer mold, the increased number and larger diameter of the injection holes 15 allow the molten injection material to flow more smoothly into the internal space of the inner core 2, significantly reducing flow resistance. The injection material fills the injection holes 15 more densely, reducing the likelihood of air bubbles or voids. The total number of glue pillars formed after curing increases from four to six, and the diameter of each pillar increases from 3.0 mm to 3.5 mm, doubling the total shear bearing area. When the connector is subjected to axial tensile force, the six 3.5 mm diameter glue pillars share the shear force, exhibiting a shear strength far superior to the original four 3.0 mm diameter glue pillars. This significantly increases the adhesion between the outer mold and the inner core 2, effectively preventing delamination and detachment of the outer mold from the connector during long-term use or accidental pulling.

[0101] Comparative Example 4

[0102] In the prior art, the inner core 2 is a smooth cylindrical surface structure on the outer surface to the left of the first retaining ring 5, without any snap-fit ​​or groove structure 9 for increasing the adhesion of the outer mold.

[0103] During injection molding of the outer mold, the molten injection material directly coats the smooth outer surface of the inner core 2. After solidification, the bond between the outer mold and the inner core 2 depends entirely on the adhesive force between the injection material and the surface of the inner core 2. In actual use, the cable outlet needs to withstand frequent bending stress and a certain amount of tensile force, especially under swing test conditions, where the root of the outer mold is subjected to alternating bending stress. Due to limited adhesive force, after long-term repeated bending, the interface between the outer mold and the smooth surface of the inner core 2 is prone to separation, forming tiny gaps. These gaps gradually expand under stress, eventually causing cracks to appear at the root of the outer mold. Further extension of these cracks forms through-cracks, causing the outer mold to detach from the inner core 2. This not only affects the product's appearance but, more importantly, loses its protective function at the cable outlet, potentially leading to further damage to the internal conductors of the cable.

[0104] In this application, an outer mold injection fastening position 6 is added circumferentially on the inner core 2 to the left of the first retaining ring 5. Specifically, the structure is a recessed area structure opened on the outer wall of the inner core 2. When the outer mold is injected, the molten injection material fills into the recessed area of ​​the outer mold injection fastening position 6 in a flowing state. After the injection material is solidified, the injection material forms an embedded mechanical locking structure in the area of ​​the outer mold injection fastening position 6.

[0105] When the outer mold is subjected to axial tensile force or bending stress, the snap-fit ​​structure bears the main mechanical load, rather than just the adhesive force. Even if the adhesive between the outer mold and the smooth surface of the inner core 2 gradually fails due to long-term bending, the mechanical locking force provided by the outer mold injection snap-fit ​​6 can still firmly fix the outer mold to the inner core 2, effectively preventing the injection mold from cracking or falling off at the root, and significantly improving the bending fatigue life at the cable outlet.

[0106] Comparative Example 5

[0107] In the prior art, no dedicated cable locking structure 13 is provided on the left side of the inner core 2. After the cable passes through the inner core 2, its conductor is electrically connected to the crown spring terminal 8 by welding or crimping. The insulation layer of the cable is only covered and fixed by injection molding.

[0108] This application adds a wire locking device to the left side of the inner core 2. When assembling the cable, the cable is first passed through the arched channel of the wire clamp 134, and the length of the cable extending into the inner core 2 is adjusted as needed. Then, the locking screw is tightened, and the wire clamp 134 is pressed downward under the pulling force of the screw. Its arched top tightly presses the cable against the surface of the semi-circular plate 14. Because the arched structure of the wire clamp 134 has elastic deformation capability, the pressure it applies to the cable is evenly distributed, and it will not cause excessive compression to the cable locally, thus damaging the cable's insulation layer or internal conductor.

[0109] When the cable is subjected to axial tension, the tension first acts on the friction between the clamp 134 and the cable, as well as the clamping force of the clamp 134 on the cable. This tension is directly borne by the locking device, and is blocked at the entrance of the connector, preventing it from being further transmitted to the internal solder joints or crimping points. This effectively protects the internal electrical connections of the connector from damage. At the same time, the presence of the locking device also reduces the stress concentration of the cable at the root of the outer mold. Because the axial displacement of the cable is restricted by the locking device, the root of the outer mold only needs to bear bending stress and not tensile stress, further reducing the risk of outer mold cracking.

[0110] Comparative Example 6

[0111] Existing crown spring terminals 8 are mostly single crown spring structures. This application improves them to double crown spring structures, where each crown spring terminal 8 has two crown spring contact rings spaced apart in the axial direction within the inner hole of the core 3. Each crown spring contact ring consists of multiple elastic springs evenly distributed circumferentially, and the two contact rings are connected as one unit by the main body of the terminal. When the pin of the external male connector is inserted, the pin simultaneously forms elastic contact with both crown spring contact rings. The two contact rings functionally form contact redundancy. Even if the spring of one contact ring experiences elastic decay or poor contact due to long-term use, the other contact ring can still maintain a reliable electrical connection, thereby effectively ensuring the continuity of signal transmission. At the same time, the axial distribution of the two contact rings increases the total contact length between the pin and the crown spring terminal 8, i.e., increases the contact area, which helps to reduce contact resistance and improve current carrying capacity.

[0112] Comparative Example 7

[0113] In the prior art, the wave-shaped gasket 11 adopts a common circular gasket structure, that is, the gasket is a thin annular sheet with a smooth circular inner hole on the inner edge and a smooth circular outer contour on the outer edge. In the actual use of the connector, each time the operator tightens the outer nut 1, sliding friction is generated between the left end face of the outer nut 1 and the side surface of the wave-shaped gasket 11. This frictional force tends to drive the wave-shaped gasket 11 to rotate together with the outer nut 1. Since the frictional force between the wave-shaped gasket 11 and the smooth outer wall of the inner core 2 is extremely limited, after multiple tightening operations, the wave-shaped gasket 11 will gradually rotate circumferentially relative to the inner core 2 under the drive of the frictional torque.

[0114] As the number of uses accumulates, the circumferential offset of the wave shim 11 continues to increase. When its waveform is axially compressed, it no longer deforms uniformly in all directions, but becomes skewed—the peaks tilt to one side and the troughs shift to the other side. This skew causes the effective elastic stroke of the wave shim 11 to change, and the elastic force at different angle positions is no longer equal, which seriously weakens the function of the wave shim 11 in providing uniform axial preload.

[0115] The gasket of this application is made of elastic metal material by stamping, and its circumference is wavy with alternating peaks and troughs. The distance H between the peaks and troughs is precisely adjusted from 1.5±0.05mm in the prior art to 1.2±0.05mm, which makes the rigidity of the wave gasket 11 more flexible and the elasticity more stable. At the same time, the outer diameter of the wave gasket 11 is precisely set to 17.5mm. This size ensures that the outer edge of the wave gasket 11 does not exceed the outer contour of the outer nut 1 after assembly, avoiding the safety hazard of the operator's fingers being cut by contact with the edge of the gasket during the tightening process.

[0116] Example 4

[0117] like Figure 8 The method shown is a comprehensive test method for an anti-disengagement connector female, used to evaluate the mechanical durability and connection reliability of the anti-disengagement connector female under insertion, extraction, locking, and cable bending conditions, including the following steps:

[0118] S01 performs a visual inspection of the anti-disengagement connector female head to confirm that it is free of cracks, burrs and deformation defects.

[0119] S02 Connect the anti-detachment connector female head to the matching male head, measure and record the maximum insertion force value;

[0120] S03 After locking the anti-detachment connector female head and the matching male head, apply a tensile force in the axial direction, measure and record the initial pull-out force value;

[0121] S04 After repeatedly inserting and locking the anti-detachment connector female head and the matching male head N times, measure and record the attenuated pull-out force value again.

[0122] S05 calculates the attenuation rate between the attenuated pull-out force value and the initial pull-out force value. If the attenuation rate does not exceed a preset threshold, it is determined to be qualified.

[0123] Specifically, under standard lighting conditions, visually inspect the female connector of the anti-disengagement connector or perform an appearance inspection with the aid of a low-magnification magnifying glass to confirm that its housing, locking structure 13 and contact interface are free from visible defects such as cracks, burrs, flash, corrosion and plastic deformation. At the same time, check that the surface of the matching male connector contact terminal is clean and free from oxidation or foreign matter to ensure the consistency of the test starting point.

[0124] Align the anti-detachment connector female head with the specified matching male head axially and insert them at a constant speed (e.g., 10mm / min to 50mm / min) until fully inserted. Use a dynamic testing machine with a force sensor to continuously record the force value change curve throughout the insertion process, and record the peak value of the curve as the maximum insertion force value. After fully inserting the anti-detachment connector female head with the matching male head, reliably lock it according to the locking method required by the product design. Then, use a tensile testing machine to apply a separation pull force along the axial direction at a constant speed (e.g., 50mm / min), continuously record the force value during the separation process, and record the maximum force value at the moment of failure of the locked state as the initial pull-out force value.

[0125] Repeat the complete cycle of "full mating → locking → unlocking → full removal" between the female and male anti-disengagement connectors, and record the number of cycles as N. After every 10 cycles, a short pause is allowed to check the wear of the contact surfaces, but the total number of cycles N is in the range of 10-100, depending on the expected service life of the product or relevant industry standards.

[0126] After completing the above N cycles, again using the same clamp, speed, and direction as in step S03, measure and record the pull-out force value after each cycle, denoted as the attenuated pull-out force value. Calculate the attenuation rate η using the following formula:

[0127] η = [(Initial pull-out force - Attenuated pull-out force) / Initial pull-out force] × 100%

[0128] If the attenuation rate η does not exceed a preset threshold of 20%, the insertion and removal locking durability of the anti-disengagement connector female head is deemed qualified; otherwise, it is deemed unqualified.

[0129] Example 5

[0130] Furthermore, this embodiment also proposes a cable sway fatigue test, as detailed below:

[0131] Connect the finished cable that meets the specifications to the end of the anti-detachment connector female head according to the standard process. Then fix the connector assembly on the swing test machine and make the cable swing from the vertical direction to the left and right sides respectively. The swing angle on each side is 90° (i.e., 90° on the left and 90° on the right, with a total swing amplitude of 180°) and the swing frequency is 40 times / minute.

[0132] The cable was subjected to a reciprocating swing operation for a total of 1 million cycles. During the swing, the continuity of the connector's electrical signal was continuously monitored, ensuring that there were no signal interruptions or loss of contact throughout the entire process. After the swing was completed, the following were checked and recorded:

[0133] Check whether the female and male connectors of the anti-detachment connector have become loose, stuck, or failed to lock properly;

[0134] Check for cracks or breaks in the female and male connector housings and locking mechanism;

[0135] Check whether there is insulation damage, broken core wire, or significantly increased contact resistance at the connection between the cable and the female connector.

[0136] If all inspection items are normal and the signal remains continuous without interruption throughout the process, the sample is deemed to have passed the cable swing reliability test.

[0137] Ultimately, a batch of anti-detachment connector female products can only be deemed as generally qualified and allowed to leave the factory or proceed to the next assembly process if the tested sample simultaneously meets both of the following conditions:

[0138] (1) In the insertion and extraction locking durability test, the attenuation rate η shall not exceed 20%;

[0139] (2) During the cable swing test, it completed 1 million cycles of reciprocating swing without any signal drop or contact interruption. After the test, all checks showed no abnormalities.

[0140] Example 6

[0141] The self-test in this embodiment was performed under a standard environment with normal temperature (23℃±5℃), humidity of 40%RH–60%RH, no strong electromagnetic interference, and no external vibration.

[0142] Before testing, the fully automatic swing life tester, high-precision digital multimeter, and digital oscilloscope with threshold warning function were calibrated to confirm that the equipment accuracy met the standards.

[0143] Take the smart screwdriver sample provided by the customer, let it stand until the environment stabilizes, and measure the static resistance of its signal pins 2 and 3. Confirm that the initial value is within the standard range of 210Ω–215Ω. The appearance, assembly structure and initial power-on state of the sample are all normal.

[0144] Subsequently, the swing test machine was set to a single ±90 degree reciprocating swing mode with fully automatic continuous operation. The swing frequency was set according to the actual value (e.g., 30 times / minute), and the test voltage / current was applied according to the actual operating parameters. The multimeter and oscilloscope were precisely connected to pins 2 and 3 of the sample, and the real-time resistance acquisition and waveform recording functions were enabled. The oscilloscope threshold warning was set according to the standard resistance range: once the resistance exceeds 210–215Ω, waveform recording and alarm will be automatically triggered.

[0145] The sample was kept powered on throughout the process, and the equipment continuously oscillated back and forth. The monitoring system synchronously recorded the number of runs, resistance changes, waveform status, and corresponding oscillation angles and displacement points, without any human intervention.

[0146] The test recorded two key nodes: at the design life of 200,000 cycles, the resistance of pins 2 and 3 remained stable at 210–215Ω, without fluctuations or jumps, the oscilloscope waveform was stable, and there were no warning triggers, thus the single-item judgment was qualified; at the customer's extreme test of 1 million cycles, the resistance still maintained the standard range, without sudden changes or open circuits, the waveform was stable throughout, and there were no fault waveforms or warnings, thus the single-item judgment was qualified; no abnormal cable continuity waveforms were captured throughout the test, and there were no abnormal angles or fault points.

[0147] Test results:

[0148] test node Number of swings Resistance values ​​of pins 2 and 3 Oscilloscope waveform / warning status Single item judgment Design life node 200,000 times 210-215Ω (standard range, no fluctuation) The waveform is stable, without any abnormalities or warnings. qualified Customer assessment milestones 1 million times 210-215Ω (standard range, no abrupt change) Stable waveform, fault-free waveform, no warning triggers qualified

[0149] in conclusion:

[0150] In this embodiment, the internal swing self-test was completed on the smart screwdriver sample provided by the customer. Under the condition of 90-degree swing amplitude, it successfully completed the design life test of 200,000 cycles and the customer's extreme swing test of 1 million cycles.

[0151] Throughout the test, the resistance values ​​of signal pins 2 and 3 of the sample remained stable within the standard range of 210-215Ω, with no sudden changes, jumps, or open circuits. The oscilloscope waveform remained stable throughout the test, with no trigger threshold warnings, and no abnormal waveforms were captured, nor were there any fault angles or abnormal points.

[0152] The sample signal line has stable conductivity and fully meets the customer's technical requirements and internal design standards. This self-inspection is deemed qualified.

[0153] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0154] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A female connector for preventing detachment, comprising an outer nut, an inner core, and a rubber core, characterized in that: The outer nut has a movable threaded part inside, the movable threaded part has an internal thread and can move relative to the outer nut; The right inner wall of the outer nut is provided with internal threads; The inner core is installed on the left side of the outer nut, and a first retaining ring is provided in the middle of the inner core. The portion of the inner core located to the right of the first retaining ring is accommodated inside the outer nut. The inner core has an outer mold injection fastening position circumferentially located on the left side of the first retaining ring; The rubber core is installed on the right inner side of the inner core. A second retaining ring is provided in the middle left part of the rubber core. The part of the rubber core located to the left of the second retaining ring is housed in the inner core, and the part of the rubber core located to the right of the second retaining ring is housed in the outer nut. Multiple crown spring terminals are pressed onto the left side of the rubber core; The outer right side of the inner core and the outer left side of the outer nut are respectively provided with grooves, and the retaining spring is embedded in the grooves; The wave-shaped washer is sleeved on the inner core and is axially limited between the first retaining ring and the left end face of the outer nut; The inner core is provided with multiple limiting steps on the right side of the first retaining ring in the circumferential direction, and the inner edge of the wave-shaped gasket is engaged with the limiting steps; The inner core has a locking structure on its left side for securing the cable.

2. The anti-disengagement connector female head according to claim 1, characterized in that, The movable threaded part is fitted into the inner wall of the middle part of the outer nut.

3. The anti-disengagement connector female head according to claim 1, characterized in that, The number of limiting steps is four, and the four limiting steps are evenly distributed along the circumference of the inner core.

4. The anti-disengagement connector female head according to claim 1, characterized in that, The retaining ring is an open, perfectly circular stainless steel wire.

5. The anti-disengagement connector female head according to claim 1, characterized in that, The outer diameter of the wave gasket is 17.5 mm, and the distance H between the crest and trough of the wave gasket is 1.2 ± 0.05 mm.

6. The anti-disengagement connector female head according to claim 1, characterized in that, The right end face of the rubber core protrudes 1 mm beyond the right end face of the outer nut.

7. The anti-disengagement connector female head according to claim 1, characterized in that, The inner core has multiple potting holes circumferentially, and the diameter of each potting hole is 3.5 mm.

8. The anti-disengagement connector female head according to claim 1, characterized in that, The inner core has a semi-circular plate extending outward from its left end. The locking structure includes: threaded holes symmetrically opened on the semi-circular plate, a nut installed in the threaded hole, and the wire clamp being arched with its two ends connected to the nut respectively.

9. A female connector for preventing disconnection according to claim 1, characterized in that, The crown spring terminal has a double crown spring structure.

10. A female connector for preventing disconnection according to claim 9, characterized in that, The material of the crown spring terminal is beryllium copper.

11. A test method for an anti-detachment connector female head, characterized in that, Includes the following steps: S01 performs a visual inspection of the anti-disengagement connector female head to confirm that it is free of cracks, burrs and deformation defects. S02 Connect the anti-detachment connector female head to the matching male head, measure and record the maximum insertion force value; S03 After locking the anti-detachment connector female head and the matching male head, apply a tensile force in the axial direction, measure and record the initial pull-out force value; S04 After repeatedly inserting and locking the anti-detachment connector female head and the matching male head N times, measure and record the attenuated pull-out force value again. S05 calculates the attenuation rate between the attenuated pull-out force value and the initial pull-out force value. If the attenuation rate does not exceed a preset threshold, it is determined to be qualified.

12. The test method for an anti-detachment connector female head according to claim 11, characterized in that, The value of N ranges from 10 to 100, and the preset threshold is 20%.

13. The test method for an anti-detachment connector female head according to claim 11, characterized in that, It also includes a cable sway test procedure.

Images