A replaceable contact

Abstract

The application provides a replaceable contact, which comprises a first terminal, a second terminal and a locking assembly. The first terminal is inserted into a male pin. The second terminal is provided with a locking hole. The locking assembly is connected to the first terminal and the second terminal, and comprises a first locking member. The first locking member passes through the first terminal in the axial direction and is connected to the locking hole. The first locking member is provided with a threaded structure which is locked to the locking hole. A second locking member is arranged in the second terminal and wraps the first locking member. The reliability of the replaceable contact is improved by the above structure.

Description

Technical Field

[0001] This application relates to the field of connectors, and more particularly to a replaceable contact. Background Technology

[0002] In practical use, the front-end contact portion, especially the elastic spring structure, is most prone to wear, oxidation, or deformation due to repeated insertion and removal of the male pin and exposure to dust, moisture, and arc heat. This leads to increased contact resistance, increased heat generation, and eventual failure. Existing technologies address this issue by designing the terminals to be replaceable. This allows for quick on-site replacement of worn parts without altering the rear cable and structure, restoring stable electrical performance, reducing spare parts and maintenance costs, shortening downtime, and allowing for the replacement of different front-end specifications to adapt to different male pins or application scenarios, thus extending the overall lifespan of the device.

[0003] In existing technologies, such as Chinese patent CN109075480B, in order to make the terminals replaceable, a steel sleeve, metal jacket or reinforcing sleeve is generally set at the connection between the first terminal and the second terminal. The steel sleeve is fixed by any of the following methods: interference fit, gluing or crimping. Then, the first terminal is fixed to the steel sleeve or the internal thread formed by the steel sleeve by screws or clips.

[0004] However, existing technologies suffer from interference fits that introduce radial stress, which can easily lead to loosening of the fit or cracking of the terminal material under long-term thermal cycling and vibration. Furthermore, the metal-to-metal contact between steel and common terminals such as copper or brass is prone to electrochemical corrosion in humid environments, affecting assembly / disassembly and electrical contact stability. Therefore, a replaceable contact with improved reliability is needed. Utility Model Content

[0005] In view of this, it is necessary to provide a replaceable contact that improves reliability in order to solve the above problems.

[0006] An embodiment of this application provides a replaceable contact, comprising:

[0007] The first terminal is connected to the male pin;

[0008] The second terminal has a locking hole formed in its body;

[0009] A locking assembly, connecting the first terminal and the second terminal, the locking assembly comprising:

[0010] A first locking member passes through the first terminal axially and is connected to the locking hole. The first locking member is provided with a threaded structure, which is locked to the locking hole.

[0011] A second locking element is disposed within the second terminal and encloses the locking element.

[0012] In at least one embodiment of this application, the first terminal has a stepped surface, the stepped surface is located at one end near the second terminal, and the stepped surface is in contact with and abuts against the locking member.

[0013] In at least one embodiment of this application, the replaceable contact includes:

[0014] A sealing element is fitted onto a locking element and located between the locking element and the first terminal, and is in contact with the stepped surface.

[0015] In at least one embodiment of this application, the second locking member has an anti-loosening structure;

[0016] The anti-loosening structure of the second locking member can be a threaded sleeve, with the outer surface of the threaded sleeve embedded in the locking hole and the inner surface of the threaded sleeve threadedly connected to the first locking member.

[0017] In at least one embodiment of this application, the hole shape of the locking hole is the same as the outer surface shape of the second locking member;

[0018] When the second locking element is a threaded sleeve, the locking hole is a threaded hole.

[0019] In at least one embodiment of this application, the first locking member has an anti-loosening structure.

[0020] In at least one embodiment of this application, the anti-loosening structure of the first locking member is pre-applied thread adhesive, which covers the outer surface of the thread structure.

[0021] In at least one embodiment of this application, the first terminal is a resilient contact terminal.

[0022] In at least one embodiment of this application, one end of the elastic contact terminal is provided with a multi-spring structure.

[0023] In at least one embodiment of this application, the second terminal is connected to a cable;

[0024] The second terminal is connected to the cable by at least one of crimping or ultrasonic welding.

[0025] The replaceable contact provided above passes through the first terminal axially via a first locking member and is threadedly locked to a locking hole on the second terminal, and a second locking member is provided inside the second terminal to enclose the locking member.

[0026] Furthermore, the axial thread preload ensures that the force is closed in the axial direction, preventing radial residual stress caused by expansion on the terminal body. Therefore, it is not easy to loosen under vibration and thermal cycling.

[0027] At the same time, the steel sleeve is eliminated to avoid large-area contact between steel and dissimilar metals such as copper or brass. Furthermore, the second locking component wraps around and isolates the first locking component, reducing the direct contact area between dissimilar metals and significantly reducing the risk of electrochemical corrosion, thereby ensuring long-term disassembly and electrical conductivity stability. Attached Figure Description

[0028] Figure 1 This is a perspective view of the replaceable contact described in this application;

[0029] Figure 2 This is a front view of the replaceable contact described in this application;

[0030] Figure 3 This is an exploded view of the replaceable contact described in this application;

[0031] Figure 4 This is a top view of the replaceable contact described in this application;

[0032] Figure 5 for Figure 4 Sectional view of AA;

[0033] Figure 6 for Figure 5 A magnified view of a section at point B in the middle;

[0034] Explanation of main component symbols

[0035] 100. Replaceable contact; 10. First terminal; 11. Stepped surface; 12. Spring structure; 20. Second terminal; 21. Locking hole; 30. Locking assembly; 31. First locking element; 32. Second locking element; 40. Seal; Detailed Implementation

[0036] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0037] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0038] An embodiment of this application provides a replaceable contact, including a first terminal, a second terminal, and a locking assembly. The first terminal is inserted into a male pin. The second terminal has a locking hole machined into its body. The locking assembly connects the first terminal and the second terminal. The locking assembly includes a first locking member and a second locking member. The first locking member passes axially through the first terminal and connects to the locking hole. The first locking member has a threaded structure, which locks into the locking hole. The second locking member is disposed within the second terminal and encloses the first locking member.

[0039] The first locking member passes axially through the first terminal and is threaded into the locking hole on the second terminal, and a second locking member is provided inside the second terminal to enclose the locking member.

[0040] Furthermore, the axial thread preload ensures that the force is closed in the axial direction, preventing radial residual stress caused by expansion on the terminal body. Therefore, it is not easy to loosen under vibration and thermal cycling.

[0041] At the same time, the steel sleeve is eliminated to avoid large-area contact between steel and dissimilar metals such as copper or brass. Furthermore, the second locking component wraps around and isolates the first locking component, reducing the direct contact area between dissimilar metals and significantly reducing the risk of electrochemical corrosion, thereby ensuring long-term disassembly and electrical conductivity stability.

[0042] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] Please see Figures 1-6 This application provides a replaceable contact 100, including a first terminal 10, a second terminal 20, and a locking assembly 30. The first terminal 10 is inserted into a male pin. The second terminal 20 has a locking hole 21 machined into its body. The locking assembly 30 connects the first terminal 10 and the second terminal 20. The locking assembly 30 includes a first locking member 31 and a second locking member 32. The first locking member 31 passes axially through the first terminal 10 and connects to the locking hole 21. The first locking member 31 has a threaded structure, which is locked into the locking hole 21. The second locking member 32 is disposed within the second terminal 20, and the second locking member 32 encloses the first locking member.

[0044] In this embodiment, it should be noted that the replaceable contact 100 includes a first terminal 10, a second terminal 20, and a locking assembly 30. The first terminal 10 is used to insert with a male pin, and the body of the first terminal 10 has an axial through hole along its central axis for the first locking member 31 to pass through. The body of the second terminal 20 is coaxially machined to form a locking hole 21, and the inner wall of the locking hole 21 is machined with an internal thread section that matches the first locking member 31.

[0045] During assembly, the first locking member 31 passes through the through hole of the first terminal 10 axially from front to back, and then directly engages with and tightens the locking hole 21 of the second terminal 20, thereby achieving an axial locking connection between the first terminal 10 and the second terminal 20. The second locking member 32 is arranged inside the second terminal 20, surrounding the axial channel where the first locking member 31 is located. Its inner side forms a covering fit with the outer circumferential surface of the first locking member 31, and its outer side fits with the inner cavity of the second terminal 20, so that the first locking member 31 is circumferentially wrapped and guided inside the second terminal 20, thereby completing the coaxial positioning and connection between the terminals without the need for an external steel sleeve.

[0046] An axial preload force flow closure is established through the threaded pair between the first locking member 31 and the locking hole 21 of the second terminal 20 body. The connection force is transmitted axially through the internal thread section—the first locking member 31—the first terminal 10, without applying radial residual stress caused by expansion to the terminal body.

[0047] Meanwhile, the second locking member 32 circumferentially wraps around and guides the first locking member 31 inside the second terminal 20, suppressing the micro-movement and deflection of the locking member under vibration and thermal cycling conditions, reducing bending and wear of the threaded pair, thereby improving the connection's resistance to loosening and durability. Furthermore, this internal sleeve structure is located inside the cavity of the second terminal 20, isolated from the outside, avoiding the risk of electrochemical corrosion caused by large-area dissimilar metal contact between the external steel sleeve and the terminal material, taking into account both reusability and long-term conductive stability, and meeting the needs of quick replacement of the front-end contact part on site.

[0048] In one specific embodiment, the first terminal 10 has a stepped surface 11, which is located at one end near the second terminal 20, and the stepped surface 11 is in contact with and abuts against the locking member.

[0049] In this embodiment, it should be noted that the first terminal 10 has a stepped surface 11 integrally machined at the end near the second terminal 20. The stepped surface 11 is preferably an annular end face coaxial with the axis of the device. Furthermore, the stepped surface 11 is substantially perpendicular to the axis of the first terminal 10 or has an end face shape with a taper of no more than a small diameter. The stepped surface 11 serves as an axial force-bearing shoulder. After tightening, the lower end face of the head of the first locking member 31, such as a cylindrical head or an internal hexagonal socket head cap, comes into face-to-face contact with the stepped surface 11, thereby providing a reaction force support from the stepped surface 11 against the tightening force of the first locking member 31.

[0050] The stepped surface 11 can be obtained by turning, milling, or fine blanking, prioritizing its end face quality and roughness to achieve stable bonding. To avoid curling or burrs at the ends affecting the bonding quality, a small chamfer can be provided on the outer edge of the step.

[0051] By providing a stepped surface 11 on the first terminal 10 and abutting it against the head of the first locking member 31, a clear axial force circuit and physical stop are formed. During tightening, the preload closes along the threaded pair - first locking member 31 - stepped surface 11 - first terminal 10, and the force flow is transmitted by end-face pressing, avoiding local point or line contact caused by the lack of a bearing surface and the resulting misalignment and stress concentration. At the same time, the stepped surface 11 provides a stable and repeatable assembly reference and termination position, limiting the axial displacement of the first terminal 10 relative to the second terminal 20, improving the positioning consistency and conductive path stability after replacement. Under vibration and thermal cycling conditions, the end-face contact force mode suppresses the fretting and oscillation of the locking member head, reduces the bending load and wear of the threaded pair, and thus improves the resistance to loosening and durability. In addition, the clear stop also makes the assembly torque easier to control, reducing the risk of thread damage or terminal deformation caused by over-tightening.

[0052] In one specific embodiment, the replaceable contact 100 includes a seal 40. The seal 40 is sleeved on the locking member, the seal 40 is located between the locking member and the first terminal 10, and the seal 40 is in contact with the stepped surface 11.

[0053] In this embodiment, it should be noted that a sealing element 40 is provided at the stepped surface 11 formed at the end of the first terminal 10 near the second terminal 20. The sealing element 40 is an annular elastic element, which is installed in a sleeve manner on the rod of the first locking element 31, and preferably near the lower part of its head. The axis of the sealing element 40 is coaxial with the central axis of the contact element.

[0054] During assembly, the first locking member 31 passes through the first terminal 10 axially, and the seal 40 is brought onto the stepped surface 11. Then, the head of the first locking member 31 presses the seal 40 onto the stepped surface 11 and fits it, so that the seal 40 is located between the first locking member 31 and the first terminal 10 to form an end face seal.

[0055] To facilitate positioning and suppress extrusion, an annular receiving groove can be machined on the stepped surface 11 to accommodate the seal 40. The seal 40 can be one of an O-ring, a semi-circular cross-section ring, or a flat lip ring, and the material can be fluororubber, silicone rubber, or nitrile rubber, etc. The inner diameter of the seal 40 is slightly interference-fitted relative to the diameter of the first locking member 31 rod to achieve self-holding, and the outer diameter mates with the stepped surface 11 or the receiving groove.

[0056] By fitting the first locking member 31 and pressing its head against the end face of the stepped surface 11 for sealing, the sealing member 40 automatically centers coaxially during tightening and generates controllable axial compression, forming a stable, short-path sealing interface. This effectively prevents dust and moisture from entering the connection area between the first terminal 10 and the second terminal 20, reducing the risk of oxidation and corrosion at the contact points. Simultaneously, the sealing member 40 provides elastic buffering and damping between the locking head and the stepped surface 11, suppressing fretting wear and loosening tendencies under vibration conditions and improving the long-term stability of the connection.

[0057] In one specific embodiment, the second locking member 32 has an anti-loosening structure. The anti-loosening structure of the second locking member 32 is a threaded sleeve, the outer surface of which is embedded in the locking hole 21, and the inner surface of which is threadedly connected to the first locking member 31.

[0058] In this embodiment, it should be noted that the anti-loosening structure of the second locking member 32 is embedded in the locking hole 21, and the inner surface of the anti-loosening structure of the second locking member 32 is in contact with the first locking member.

[0059] Furthermore, the shape of the anti-loosening structure of the second locking member 32 is not limited, and its shape is a ring structure that matches the locking part of the first locking member 31. It is used to wrap the locking part of the first locking member.

[0060] The second locking element is made of retractable materials such as silicone, rubber, or spring steel.

[0061] The anti-loosening structure of the second locking member 32 can be located at any of the starting end, ending end or intermediate end of the locking of the second locking member.

[0062] The second locking member 32 has a threaded sleeve as its anti-loosening structure, and its inner surface is machined with an internal thread that matches the first locking member 31. The body of the second terminal 20 coaxially forms a locking hole 21, and the opening of the locking hole 21 is provided with an inlet chamfer. The outer surface of the threaded sleeve is provided with one or more of the following structures for insertion: knurling, non-circular shape, stepped shoulder, or thread, to improve the insertion stability with the locking hole 21.

[0063] During assembly, the threaded sleeve is axially inserted into the locking hole 21, for example by pressing in with a stepped limit or by injection molding. The outer surface of the threaded sleeve and the locking hole 21 form a surface-to-surface fit, thereby achieving circumferential wrapping and guidance of the first locking member 31 within the second terminal 20. Subsequently, the first locking member 31 passes axially through the first terminal 10 and engages with the internal thread of the threaded sleeve to tighten, completing the axial locking connection between the first terminal 10 and the second terminal 20.

[0064] By incorporating an embedded threaded sleeve within the second terminal 20, the wear, thermal cycling, and vibration loads generated by thread engagement and repeated disassembly / reassembly are concentrated and transferred to the threaded sleeve. This avoids directly machining the internal thread on the softer or more easily worn material of the second terminal 20, significantly reducing the risks of thread stripping, pull-out, and hole wall deformation. The outer surface of the threaded sleeve and its embedded fit with the locking hole 21 form a form and position constraint and load-bearing shell, effectively suppressing the micro-movement and wobble of the first locking element 31 under vibration conditions, thus improving the anti-loosening and durability of the threaded pair. Simultaneously, the threaded sleeve provides stable internal thread accuracy and hardness, making the preload easier to control and improving repeatability, reducing fluctuations in connection performance caused by repeated replacement of the first terminal 10.

[0065] In one specific embodiment, the locking hole 21 has the same hole shape as the outer surface shape of the second locking member 32. When the second locking member 32 is a threaded sleeve, the locking hole 21 is a threaded hole.

[0066] In this embodiment, it should be noted that the second locking member 32 is specifically a threaded sleeve with an external thread structure on its outer surface. The locking hole 21 formed by machining the body of the second terminal 20 is a threaded hole that mates with it, and the axes of both are coaxial with the central axis of the replaceable contact member 1. To facilitate assembly, the inlet of the locking hole 21 is provided with an inlet chamfer, and if necessary, an end stop is provided at the bottom of the hole to limit the screwing depth of the threaded sleeve. The tooth profile, pitch, pitch angle, and mean diameter of the external thread of the threaded sleeve are consistent with the internal thread parameters of the locking hole 21, that is, the hole shape and the outer surface shape are the same, which is reflected in the fact that both adopt the same thread geometry to achieve a standardized threaded pair fit.

[0067] After being screwed in, the threaded sleeve is reliably constrained in both the circumferential and axial directions relative to the second terminal 20. Its inner surface retains the internal thread that mates with the first locking member 31, forming a working thread pair with the first locking member 31. Depending on the structural space, the front end of the threaded sleeve can be flush with or slightly recessed from the end face of the second terminal 20 to avoid exposure that could affect guidance and protection.

[0068] The use of an external threaded sleeve with the same hole shape or profile as the threaded thread allows the sleeve to screw into the second terminal 20, forming a positive mechanical engagement. This avoids radial expansion stress and irreversible assembly problems caused by interference fit. The surface contact and sufficient engagement length of the threaded engagement ensure that the load is evenly transmitted along the threaded pair. Under vibration and thermal cycling conditions, it can effectively suppress relative rotation and axial movement, thereby stabilizing the preload of the first locking element 31. At the same time, the threaded sleeve bears the wear and local stress generated by repeated disassembly and assembly, protecting the body of the second terminal 20 from stripping or scratching, and ensuring the coaxiality of the connection and consistency of long-term repeated assembly.

[0069] In one specific embodiment, the first locking member 31 has an anti-loosening structure.

[0070] In this embodiment, it should be noted that: if the first locking member 31 is a fastener that is threadedly engaged with the locking hole 21 on the second terminal 20, an anti-loosening structure is provided on its threaded engagement section.

[0071] The anti-loosening structure of the first locking member 31 can be a self-locking tooth type such as a wedge tooth, a triangular tooth, or a partially elliptical locking section directly formed on the first locking member 31, or a nylon patch or resin patch set on the outer periphery of the thread of the first locking member 31, or a pre-coated microcapsule adhesive covering the thread surface, etc.

[0072] The anti-loosening structure of the first locking member 31 generates a continuous anti-loosening force during assembly and tightening by increasing the surface friction coefficient of the threaded pair, forming elastoplastic interference, or releasing the adhesive under compression and shear to fill the thread gap.

[0073] The anti-loosening structure of the first locking member 31 is arranged within the range of the actual number of thread turns of the first locking member 31 and the locking hole 21 or the optional second locking member 32, so as to ensure that it can provide an effective anti-loosening effect within the design preload and working load range, and allow disassembly and replacement under normal tool torque conditions.

[0074] Because the first locking member 31 has the aforementioned anti-loosening structure, after tightening, a continuous and repeatable anti-loosening torque can be established in the threaded pair, significantly suppressing fretting loosening caused by vibration, impact, and thermal cycling, and maintaining the axial preload force from easily decaying. After the thread clearance is compensated or controlled, the relative slippage and wear at the meshing point can be reduced, and the force flow disturbance and positioning deviation caused by loosening can be reduced, thereby stabilizing the mechanical connection and electrical contact state between the terminals and improving the reliability and durability of long-term use. At the same time, the anti-loosening structure ensures that the disassembly-reassembly process after assembly still achieves predictable starting or rewinding torque and preload reproducibility, facilitating the replacement of the first terminal 10 on-site without damaging the threaded pair of the second terminal 20.

[0075] In one specific embodiment, the anti-loosening structure is a pre-coated thread adhesive, which covers the outer surface of the thread structure.

[0076] In this embodiment, it should be noted that the outer surface of the threaded structure of the first locking member 31 is pre-coated with pre-coated thread adhesive to form a circumferential continuous or segmented coating strip, and the coverage area is preferably within the number of thread turns that actually engage with the locking hole 21 of the second terminal 20 or the internal thread of the optional second locking member 32.

[0077] The pre-applied threadlocker is a dry-touch type and does not flow before assembly. During assembly, it is screwed in axially along with the first locking member 31. The microcapsules in the coating are sheared and broken, and are compressed and filled into the gaps between the threads. Simultaneously, it cures in a metal ion and oxygen-deficient environment, forming a stick-slip composite locking layer. To ensure the cleanliness of the end face seal, an uncoated section is left between the pre-applied area and the lower surface of the head of the first locking member 31 to prevent the adhesive from squeezing into the contact surface between the stepped surface 11 and the sealing member 40. To prevent end overflow, a safe distance is left between the starting position of the pre-applied adhesive and the threaded end.

[0078] By relying on the continuous retraction torque generated during assembly and tightening of the pre-applied thread sealant and its sealing effect on the thread side clearance, the axial preload can be stabilized under vibration and thermal cycling conditions, significantly suppressing fretting and backlash of the threaded pair. The sealant layer acts as an elastic damping medium, dispersing local loads and reducing wear, thereby improving the connection's resistance to loosening and its durability. Simultaneously, the sealing of the thread side clearance reduces the capillary infiltration of dust and moisture along the thread channel. Combined with the end-face seal at step 11, this further reduces the impact of corrosion and oxidation on electrical contact, maintaining long-term electrical conductivity stability.

[0079] Because it is a dry film pre-coated form, no additional adhesive is required during assembly, resulting in better torque consistency. During disassembly, a maintainable and reversible connection can still be achieved within the set starting torque range. If the locking force weakens due to repeated disassembly and assembly, simply replacing the first locking component 31 will restore the locking performance.

[0080] In one specific embodiment, the first terminal 10 is a resilient contact terminal.

[0081] In this embodiment, it should be noted that the first terminal 10 specifically adopts the structure of an elastic contact terminal. The front end of the first terminal 10 is configured as an elastically deformable contact portion, preferably a cylindrical elastic segment formed by axially slotted grooves or several cantilevered arms integrally processed into an elastic area, generating a controllable elastic clamping force when the male pin is inserted. The rear end of the first terminal 10 remains coaxial with the through hole of the first locking member 31 to ensure that the locking member passes through axially during assembly.

[0082] To improve conductivity and wear resistance, the first terminal 10 is made of copper or copper alloy and plated, such as with nickel plating followed by silver plating. The elastic zone has a working elastic stroke and a limit stroke, and has a pre-formed pre-tightening angle when not inserted. A guide chamfer can be set at the front end of the insertion path to reduce insertion force and avoid scratching the male pin.

[0083] Because the first terminal 10 has elastic clamping and rebound capabilities, it can automatically compensate for micro-displacement caused by dimensional tolerances, thermal expansion and contraction, and vibration during the insertion process with the male pin, thereby maintaining stable contact pressure and low and repeatable contact resistance throughout the entire service life, reducing heat generation and failure caused by poor contact; the elastic zone disperses the insertion force into multiple points or line contacts during engagement, reducing single-point stress and wear, and improving scratch resistance and oxide film penetration resistance.

[0084] Meanwhile, the insertion and removal impacts and lateral deviations are mainly absorbed and attenuated by the elastic zone, reducing the additional load on the threaded pair of the locking assembly 30, the locking hole 21 and the first locking member 31, suppressing the loosening tendency, and improving the vibration resistance and maintainability of the overall connection.

[0085] In one specific embodiment, one end of the elastic contact terminal is provided with a multi-spring structure 12.

[0086] In this embodiment, it should be noted that the first terminal 10 adopts a multi-spring structure 12 for elastic contact. Its front end is composed of several cantilever springs separated by, for example, 3 to 8 axial slots along the circumferential direction. The springs are integrally formed with the annular root of the first terminal 10, and the free ends are slightly converging inward toward the device axis. The inner side of the free end of each spring can be an arc surface or a slightly convex surface to form a surface contact with the male pin. The outer edge of the spring has a small chamfer to facilitate insertion. The multiple springs are evenly distributed circumferentially and coaxially form an insertion interface, which has a pre-formed clamping gap and pre-tightening angle when not inserted.

[0087] During insertion, the male pin enters from the guide end, causing each spring to elastically open radially and generate normal force, thereby achieving multi-point parallel conduction and clamping. To improve wear resistance and oxidation resistance, the first terminal 10 can be made of copper or copper alloy and subjected to nickel plating followed by silver plating.

[0088] By utilizing the circumferential multi-point parallel contact and shared elastic travel of the multi-spring contacts, the male pin size deviation, eccentricity, and thermal expansion and contraction can be automatically compensated during insertion, maintaining a stable and sufficient total contact pressure. The multi-point parallel connection reduces the single-point current density, significantly reduces local contact resistance and heat generation, and improves current carrying capacity and durability.

[0089] In one specific embodiment, the second terminal 20 is connected to a cable. The connection between the second terminal 20 and the cable is at least one of crimping or ultrasonic welding.

[0090] In this embodiment, it should be noted that the tail of the second terminal 20 is used to connect with the cable, and is specifically configured as at least one of the crimping area or the ultrasonic welding area.

[0091] Taking crimping as an example, the second terminal 20 forms a conductor crimping cylinder and an insulating crimping cylinder at its tail end. The inner wall of the cylinder is provided with fine teeth or knurling to enhance the mechanical engagement of the multi-strand strands. During assembly, the cable sheath is peeled off according to length, the exposed conductor is placed into the conductor crimping cylinder, and the outer sheath is placed into the insulating crimping cylinder. A special mold is used to complete the forming in one step, such as F-shape, closed hexagon, etc. After crimping, a dense metal-to-metal cold welded contact interface is formed.

[0092] Taking ultrasonic welding as an example, the second terminal 20 has a flat welding lug or welding disc with micro-knurling to form an energy coupling interface. The stripped multi-strand copper conductor is laid flat on it, and ultrasonic solid-state welding is completed under set pressure, time, and amplitude to form a metallurgically bonded conductive joint. After welding, heat-shrink tubing or an elastic sleeve can be applied to the interface to achieve stress release and environmental protection.

[0093] By using a solderless connection, either crimped or ultrasonically welded, between the second terminal 20 and the cable, a dense and stable metal contact interface is formed inside the joint, significantly reducing transition resistance and contact temperature rise, and improving conductivity reliability under high current and cyclic loads.

[0094] In this way, the first locking member 31 passes through the first terminal 10 axially and is threadedly locked to the locking hole 21 on the second terminal 20, and a second locking member 32 is provided in the second terminal 20 to enclose the locking member.

[0095] Furthermore, the axial thread preload ensures that the force is closed in the axial direction, preventing radial residual stress caused by expansion on the terminal body. Therefore, it is not easy to loosen under vibration and thermal cycling.

[0096] At the same time, the steel sleeve is eliminated to avoid large-area contact between steel and dissimilar metals such as copper or brass. Furthermore, the second locking member 32 wraps around and isolates the first locking member 31, reducing the direct contact area between dissimilar metals and significantly reducing the risk of electrochemical corrosion, thereby ensuring long-term disassembly and electrical conductivity stability.

[0097] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A replaceable contact, characterized in that, include: The first terminal is connected to the male pin; The second terminal has a locking hole formed in its body; A locking assembly, connecting the first terminal and the second terminal, the locking assembly comprising: A first locking member passes through the first terminal axially and is connected to the locking hole. The first locking member is provided with a threaded structure, which is locked to the locking hole. A second locking element is disposed within the second terminal and encloses the locking element.

2. The replaceable contact element according to claim 1, characterized in that, The first terminal has a stepped surface, which is located at one end near the second terminal, and the stepped surface is in contact with and abuts against the locking member.

3. The replaceable contact element according to claim 2, characterized in that, The replaceable contact includes: A sealing element is fitted onto a locking element and located between the locking element and the first terminal, and is in contact with the stepped surface.

4. The replaceable contact element according to claim 1, characterized in that, The second locking element has an anti-loosening structure; The anti-loosening structure of the second locking member can be a threaded sleeve, with the outer surface of the threaded sleeve embedded in the locking hole and the inner surface of the threaded sleeve threadedly connected to the first locking member.

5. The replaceable contact according to claim 4, characterized in that, The shape of the locking hole is the same as the outer surface shape of the second locking member; When the second locking element is a threaded sleeve, the locking hole is a threaded hole.

6. The replaceable contact according to claim 1, characterized in that, The first locking element has an anti-loosening structure.

7. The replaceable contact according to claim 6, characterized in that, The first locking component has an anti-loosening structure made of pre-applied thread adhesive, which covers the outer surface of the thread structure.

8. The replaceable contact according to claim 1, characterized in that, The first terminal is a resilient contact terminal.

9. The replaceable contact according to claim 8, characterized in that, One end of the elastic contact terminal is provided with a multi-spring structure.

10. The replaceable contact according to claim 9, characterized in that, The second terminal is connected to the cable; The second terminal is connected to the cable by at least one of crimping or ultrasonic welding.

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