A drain wire clamp and live sparking device

Abstract

The application discloses a drainage wire clamp and a live sparking device, and relates to the technical field of live sparking operation, wherein the drainage wire clamp comprises a shell, a fixed clamp block, a movable clamp block, a spring contact finger, a lead screw and a limiting structure; the fixed clamp block is fixedly arranged on the shell and is suitable for being electrically connected with the drainage wire; the movable clamp block is movably arranged on the shell and is oppositely arranged with the fixed clamp block, and a clamping space for accommodating a main cable is formed between the movable clamp block and the fixed clamp block; the spring contact finger comprises a contact finger body and an elastic piece, the elastic piece is arranged between the fixed clamp block and the contact finger body, the contact finger body is arranged towards the clamping space and is used for elastically abutting against the main cable and being electrically connected with the fixed clamp block; the lead screw is rotationally connected to the shell and is threadedly connected with the movable clamp block; the limiting structure is arranged between the shell and the movable clamp block and is used for limiting the rotation of the movable clamp block; the contact finger body is kept in abutment with the main cable under the action of the elastic piece, and the reliability of the electrical connection between the main cable and the drainage wire is improved.

Description

Technical Field

[0001] This invention relates to the field of live-line contacting technology, and particularly to a drain wire clamp and a live-line contacting device. Background Technology

[0002] Live-line connection work is a widely used operation method in the operation and maintenance of power systems. It is mainly used to connect branch lines, electrical equipment, or temporary loads to energized main cables without power interruption, to meet the operational needs of distribution network maintenance, capacity expansion, and emergency power supply scenarios. In live-line connection work, a drain wire clamp is used to connect the main cable and the drain wire, allowing current to be transmitted between the main cable and the external circuit via the drain wire. Since the main cable is energized during the operation, the drain wire clamp, once installed on the main cable, operates continuously connected to the network. The robustness of the mechanical connection and the reliability of the electrical contact between the drain wire clamp and the main cable directly affect the conductivity stability of the drain circuit and the safety of the on-site operation.

[0003] In related technologies, the clamp used to connect the main cable and the drain cable includes two opposing clamping blocks, forming a clamping space between them to accommodate the main cable. A bolt or lead screw drives one clamping block to move towards the other, clamping the main cable between the two blocks, thus achieving an electrical connection between the clamp and the main cable. However, the clamping tightness of the clamp on the main cable is easily affected by the operator's experience and operating conditions. If the clamp fails to clamp the main cable tightly, the contact between the clamp and the main cable can easily become loose, leading to increased contact resistance, overheating at the contact point between the clamp and the main cable, or even a break in the connection, affecting the reliability of the drain circuit. Summary of the Invention

[0004] The main objective of this invention is to provide a drain wire clamp and a live connection device to improve the reliability of the electrical connection between the main cable and the drain wire.

[0005] To achieve the above objectives, the present invention provides a drainage wire clamp comprising: case; A fixing block, which is fixed to the housing and is suitable for electrical connection with the drain wire; A movable clamping block is movably disposed in the housing and is disposed opposite to the fixed clamping block, and a clamping space for accommodating the main cable is formed between the movable clamping block and the fixed clamping block; A spring-loaded contact finger, comprising a contact finger body and an elastic element, wherein the elastic element is disposed between the fixed clamping block and the contact finger body, and the contact finger body is disposed toward the clamping space for elastically abutting against the main cable and being electrically connected to the fixed clamping block; A lead screw, rotatably connected to the housing and threadedly connected to the movable clamping block; and... A limiting structure is provided between the housing and the movable clamping block to restrict the rotation of the movable clamping block.

[0006] The drain line clamp has at least the following technical advantages: the screw and the limiting structure work together to convert the rotation of the screw into the translation of the movable clamping block along the screw axis. The size of the clamping space is continuously adjustable. The main cable is stably clamped between the movable clamping block and the fixed clamping block. The self-locking characteristic of the threaded drive ensures that the clamping state is maintained during the netting operation. The spring contact finger body maintains elastic contact with the main cable under the action of the elastic element. The clamping gap and the deviation of the outer diameter and surface condition of the main cable are adaptively compensated. When the clamping tends to loosen, the elastic element still pushes the contact finger body to follow the main cable to maintain contact. The main cable forms a continuous conductive path with the drain line through the contact finger body and the fixed clamping block. The reliability of the electrical connection between the main cable and the drain line and the conductivity reliability of the drain circuit are guaranteed.

[0007] In one embodiment, the fixing clamp has a groove, the elastic element is connected to the bottom of the groove, and the finger body slides in cooperation with the groove and is at least partially located outside the groove.

[0008] In one embodiment, the drain line clamp further includes an operating ring, which is connected to one end of the lead screw, and the surface of the operating ring is provided with anti-slip texture.

[0009] In one embodiment, the number of spring contacts is multiple, and the multiple spring contacts are arranged at intervals.

[0010] In one embodiment, a first arc-shaped clamping groove and a second arc-shaped clamping groove are respectively formed on the opposite side of the fixed clamping block and the movable clamping block, and the curvature of the first arc-shaped clamping groove and the curvature of the second arc-shaped clamping groove are set to be different.

[0011] In one embodiment, the end face of the finger body facing away from the fixing block is constructed as an arc-shaped end face, and multiple protrusions are formed on the arc-shaped end face.

[0012] The present invention also proposes an energized contact device, comprising: A drainage wire clamp, the drainage wire clamp being as described above; and, A wire clamp installation tool includes an insulating rod, a drive motor, a transmission sleeve, and a control module. The motor housing of the drive motor is disposed on the insulating rod. The transmission sleeve is drivenly connected to the shaft of the drive motor and is adapted to be drivenly connected to the lead screw. The control module is electrically connected to the drive motor and is used to control the start, stop, and rotation direction of the drive motor.

[0013] In one embodiment, the wire clamp installation tool further includes a remote controller, which is communicatively connected to the control module and is used to send control commands to the control module to control the start, stop, and rotation direction of the drive motor.

[0014] In one embodiment, the control module includes: A current detection unit, wherein the current detection unit is used to detect the load current of the drive motor and output a current detection signal; and, The processing unit is electrically connected to the current detection unit and is used to determine that the main cable is clamped in place and control the drive motor to stop when the load current is greater than or equal to a preset current threshold.

[0015] In one embodiment, the clamp installation tool further includes an image acquisition device disposed on the insulating rod for acquiring visual images of the drain wire clamp.

[0016] This live-line connection device has at least the following technical advantages: Operators can lift the drain wire clamp to the live main cable by holding the insulating rod; the control module controls the drive motor to rotate the lead screw via the transmission sleeve; the installation and removal of the clamp are completed electrically at a location away from the live conductor; the electrical distance between the operator and the live conductor is ensured by the insulating rod, thus improving the safety of live-line work; the driving force of the drive motor is stable and controllable, and the clamping process does not rely on manual force from the operator, improving the consistency of clamping quality; after the main cable is clamped, the spring contact finger maintains continuous elastic contact with the main cable, and the reliability of the electrical connection between the main cable and the drain wire during the clamp's operation is ensured by the clamp's own structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a front view of the drain line clamp provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the drainage line clamp; Figure 3 The present invention includes Figure 1 A schematic diagram of the energized connection device of the central drain line clamp.

[0019] Explanation of icon numbers: 10. Drainage wire clamp; 1. Housing; 2. Fixed clamping block; 21. First arc-shaped clamping groove; 3. Movable clamping block; 31. Second arc-shaped clamping groove; 4. Spring contact finger; 5. Lead screw; 6. Operating ring; 101. Clamping space; 20. Wire clamp installation tool; 201. Insulating rod; 202. Drive motor; 203. Transmission sleeve; 204. Remote control; 100. Electrical contact device; 200. Main cable; 300. Drainage cable.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] This invention proposes a drainage line clamp 10.

[0025] Please see Figure 1 and Figure 2In one embodiment of the present invention, the drain wire clamp 10 includes a housing 1, a fixed clamping block 2, a movable clamping block 3, a spring contact finger 4, a lead screw 5, and a limiting structure; the fixed clamping block 2 is fixedly disposed in the housing 1 and is suitable for electrical connection with the drain wire 300; the movable clamping block 3 is movably disposed in the housing 1 and is disposed opposite to the fixed clamping block 2, forming a clamping space 101 between the movable clamping block 3 and the fixed clamping block 2 for accommodating the main cable 200; the spring contact finger 4 includes a contact finger body and an elastic element, the elastic element is disposed between the fixed clamping block 2 and the contact finger body, the contact finger body is disposed towards the clamping space 101, for elastically abutting against the main cable 200, and is electrically connected to the fixed clamping block 2; the lead screw 5 is rotatably connected to the housing 1 and threadedly connected to the movable clamping block 3; the limiting structure is disposed between the housing 1 and the movable clamping block 3 for limiting the rotation of the movable clamping block 3.

[0026] The housing 1 is the basic load-bearing component of the drain wire clamp 10, providing an installation base for components such as the fixed clamp 2, movable clamp 3, spring contact finger 4, and lead screw 5. The housing 1 can be made of insulating material to provide insulation protection for internal conductive components and operators in live working environments. The fixed clamp 2 is a clamping component that is fixed in position relative to the housing 1. The installation method of fixing it to the housing 1 can be integral molding, fastener connection, or embedded fixing. The fixed clamp 2 serves as a clamping reference during clamping operations and also undertakes the function of electrical connection with the drain wire 300. The drain wire 300 can be a wire that is crimped, welded, or connected to the fixed clamp 2 through fasteners. The drain wire 300 is used to lead the current on the main cable 200 to the external circuit. The movable clamping block 3 is a clamping component that can move relative to the housing 1. The movable clamping block 3 is arranged opposite to the fixed clamping block 2 and cooperates to clamp the main cable 200. The space between the movable clamping block 3 and the fixed clamping block 2 is the clamping space 101, which is used to accommodate the main cable 200. The main cable 200 is the wire being clamped. In the scenario of live-line work, the main cable 200 can be the main cable 200 in the power distribution network that is in a live state. The spring contact finger 4 is a conductive contact that can provide elastic contact pressure. The contact finger body is the conductive part of the spring contact finger 4 that is used to directly contact the main cable 200. The elastic element is a component located between the fixed clamping block 2 and the contact finger body that is used to apply elastic force to the contact finger body. The elastic element can be a spring or other component that can store and release elastic potential energy. The contact finger body is arranged facing the clamping space 101 and is electrically connected to the fixed clamping block 2, so that the main cable 200 can be connected to the drain wire 300 in sequence through the contact finger body and the fixed clamping block 2. The lead screw 5 is a threaded transmission component that converts rotational motion into linear motion. The lead screw 5 is rotatably connected to the housing 1, meaning it can rotate relative to the housing 1 around its own axis, while its axial position is constrained by the housing 1. The lead screw 5 is threadedly connected to the movable clamping block 3, meaning they are engaged through a threaded pair. When the lead screw 5 rotates, the threaded pair drives the movable clamping block 3 to move axially along the lead screw 5. The limiting structure is located between the housing 1 and the movable clamping block 3 to constrain its rotational freedom. The limiting structure can be a pair of mating guide planes, guide posts and guide holes, or slide rails and sliders. Electrical connection refers to a conductive connection between two components capable of transmitting current. This connection can be achieved through direct contact, welding, crimping, or a conductive transfer mechanism. Fixed to the housing 1 means the relative position of the fixed clamping block 2 and the housing 1 is fixed; the fixed clamping block 2 does not move relative to the housing 1 during clamping operations and net hanging operations. The movable arrangement of the movable clamping block 3 within the housing 1 means that the movable clamping block 3 can move in a set direction under the constraint of the housing 1. The travel of the movable clamping block 3 is determined by the number of rotations of the lead screw 5 and the lead of the threaded pair.

[0027] It is understandable that the movable clamping block 3 needs to move linearly during the clamping of the main cable 200. However, the movable clamping block 3 is driven by the screw 5 through a threaded transmission. The threaded transmission itself transmits the rotational tendency of the screw 5 to the movable clamping block 3. If the movable clamping block 3 rotates with the screw 5, it cannot move stably toward the fixed clamping block 2, making the clamping action difficult to complete. The limiting structure is located between the housing 1 and the movable clamping block 3, which restricts the rotational freedom of the movable clamping block 3. When the screw 5 rotates, the movable clamping block 3 can only move linearly along the axis of the screw 5. The rotation of the screw 5 is thus stably converted into the translation of the movable clamping block 3. The size of the clamping space 101 is continuously adjustable with the rotation of the screw 5, and the main cable 200 can be gradually clamped between the movable clamping block 3 and the fixed clamping block 2. The threaded drive also has a self-locking characteristic. After the lead screw 5 stops rotating, the movable clamping block 3 is difficult to push the lead screw 5 to rotate in the opposite direction under the action of the clamping reaction force, and the clamping state can be maintained for a long time. This is beneficial for the wire clamp to maintain the clamping force on the main cable 200 during the wire mesh operation. The lead screw 5 is rotatably connected to the housing 1 and its axial position is constrained by the housing 1. When the movable clamping block 3 moves along the axial direction of the lead screw 5, the lead screw 5 itself does not move axially. There is a definite correspondence between the opening and closing amount of the clamping space 101 and the rotation angle of the lead screw 5. The operator or driving tool can accurately control the size of the clamping space 101 by controlling the rotation amount of the lead screw 5. The clamping process is smooth and controllable. The transmission ratio of the threaded drive is stable. For each revolution of the lead screw 5, the movement of the movable clamping block 3 is equal to the lead of the thread pair. The clamping force is applied evenly and continuously. The main cable 200 is subjected to less impact force during the clamping process, and the surface of the conductor is not easily damaged by the clamping impact. During clamping operations, the main cable 200 first enters the open clamping space 101. The lead screw 5 is driven to rotate, and the movable clamping block 3, constrained by the limiting structure, approaches the fixed clamping block 2 along the axial direction of the lead screw 5. The clamping space 101 gradually closes, and the movable clamping block 3 and the fixed clamping block 2 press against the main cable 200 from both sides. The main cable 200 is clamped in the clamping space 101. The clamping force of the movable clamping block 3 is provided by the input torque of the lead screw 5 after being amplified by the thread pair. A small input torque can generate a large clamping force. Both manual operation and electric drive can complete the clamping action.

[0028] After the main cable 200 is clamped, the contact finger body of the spring contact finger 4 remains in contact with the main cable 200 under the elastic force of the elastic element. The outer diameter of the main cable 200 may have manufacturing deviations, and the surface of the conductor may be oxidized, contaminated, or have microscopic unevenness. Therefore, it is difficult for the clamping block to achieve a tight fit at every contact point. The contact finger body, pushed by the elastic element, can adaptively compensate for the clamping gap, always pressing against the surface of the main cable 200 and maintaining reliable physical contact with it. Since the contact finger body is electrically connected to the fixed clamp 2, and the fixed clamp 2 is electrically connected to the drain wire 300, a continuous conductive path is formed between the main cable 200, the contact finger body, the fixed clamp 2, and the drain wire 300. Even if the clamping between the main cable 200 and the fixed clamp 2 and the movable clamp 3 loosens due to thermal expansion and contraction caused by line vibration, temperature changes, or creep caused by long-term stress on the wire, the elastic potential energy stored in the elastic element can still continuously push the contact finger body to follow the position change of the main cable 200, maintaining the contact state between the contact finger body and the main cable 200. The continuity of the conductive path is thus maintained, and the increase in contact resistance and the occurrence of connection breakage are reduced. This helps to ensure the electrical connection between the main cable 200 and the drain wire 300 and improves the conductivity reliability of the drain circuit. From the perspective of the conductive path, the conduction between the main cable 200 and the drain wire 300 passes sequentially through the contact interface between the contact finger body and the main cable 200, the connection interface between the contact finger body and the fixed clamp 2, and the connection interface between the fixed clamp 2 and the drain wire 300. The continuous pressure applied by the elastic element to the contact finger body ensures that the contact interface between the contact finger body and the main cable 200 always maintains sufficient contact pressure, keeping the contact resistance at a low level. Consequently, the heat generated when the drain circuit carries a large current is reduced, and the operating temperature rise of the clamp is controlled. The spring contact finger 4 is integrated into the fixed clamp 2, and the conductive path does not pass through moving parts such as the movable clamp 3. The current transmission path is short and the number of contact interfaces is small, thus improving the stability of the conductive path.

[0029] In some embodiments, the housing 1 is an insulating housing 1, made of high-strength engineering plastic injection molding or epoxy resin casting molding, possessing both electrical insulation performance and mechanical strength, and providing insulation protection for internal conductive components in live working environments. The elastic element is a helical compression spring, which is arranged along the movement direction of the contact finger body, with a simple structure and stable elastic force output. The fixed clamping block 2 is fixed to the bottom of the housing 1, and the movable clamping block 3 is arranged above the fixed clamping block 2. The lead screw 5 is arranged in the vertical direction to form an upper locking structure. The movable clamping block 3 approaches the fixed clamping block 2 from top to bottom to clamp the main cable 200. The main cable 200 enters the clamping space 101 from below, which is compatible with the working posture of the line clamp hanging the main cable 200 from bottom to top in live welding operations. The limiting structure includes a guide plane disposed on the inner wall of the housing 1 and a limiting plane disposed on the outer periphery of the movable clamping block 3. The guide plane and the limiting plane slide against each other to limit the rotation of the movable clamping block 3 around the axis of the lead screw 5. The limiting structure can also be a matching structure of a guide post and a guide hole disposed between the housing 1 and the movable clamping block 3. The main cable 200 can be a copper or aluminum wire with a cross-sectional area of ​​25mm² to 240mm². The drain wire 300 is connected to the fixed clamping block 2 through a crimp terminal, or the drain wire 300 is directly welded to the fixed clamping block 2. The rotational connection between the lead screw 5 and the housing 1 is achieved through a bearing or bushing disposed on the housing 1. The axial position of the lead screw 5 is limited by the fit between the stepped surface and the housing 1. The contact finger body is made of copper alloy conductive material to balance conductivity and wear resistance.

[0030] The drain line clamp 10 has at least the following technical effects: the lead screw 5 cooperates with the limiting structure to convert the rotation of the lead screw 5 into the translation of the movable clamp 3 along the axis of the lead screw 5. The size of the clamping space 101 is continuously adjustable. The main cable 200 is stably clamped between the movable clamp 3 and the fixed clamp 2. The self-locking characteristic of the threaded drive ensures that the clamping state is maintained during the operation of the netting. The contact body of the spring contact finger 4 is kept in elastic contact with the main cable 200 under the action of the elastic element. The clamping gap and the deviation of the outer diameter and surface condition of the main cable 200 are adaptively compensated. When the clamping tends to loosen, the elastic element still pushes the contact body to follow the main cable 200 to maintain contact. The main cable 200 forms a continuous conductive path with the drain line 300 through the contact body and the fixed clamp 2. The reliability of the electrical connection between the main cable 200 and the drain line 300 and the conductivity reliability of the drain circuit are guaranteed.

[0031] Please see Figure 2 In an embodiment of the present invention, the fixing clamp 2 is provided with a sliding groove, the elastic element is connected to the bottom of the sliding groove, and the touch finger body slides with the sliding groove and is at least partially located outside the sliding groove.

[0032] The slide groove is a groove-shaped structure formed in the fixed clamping block 2 to accommodate the contact finger body and the elastic element. The slide groove extends along the movement direction of the contact finger body, and the bottom of the slide groove is the bottom surface of the slide groove that faces away from the clamping space 101. The elastic element is connected to the bottom of the groove, meaning that one end of the elastic element is fixed or abuts against the bottom of the groove, so that the elastic element is kept in a compressed state between the contact finger body and the bottom of the groove. The extension direction of the slide groove is consistent with the abutment direction of the contact finger body towards the main cable 200. The depth of the slide groove is greater than the maximum retraction stroke of the contact finger body, and the contact finger body has sufficient room for movement in the slide groove. The bottom of the groove can be a plane or a positioning surface adapted to the shape of the end of the elastic element. The sliding fit between the contact finger body and the slide groove means that a relatively sliding fit relationship is formed between the outer periphery of the contact finger body and the inner wall of the slide groove, and the contact finger body can reciprocate along the extension direction of the slide groove. The finger body is at least partially located outside the groove, meaning that the end of the finger body extending out of the groove towards the clamping space 101 so as to contact the main cable 200 contained in the clamping space 101.

[0033] Understandably, the groove provides storage space for the contact finger body and the elastic element. The spring contact finger 4 is fully embedded inside the fixing clamp 2, making the wire clamp structure more compact and the spring contact finger 4 less susceptible to external impacts during transportation and installation. The inner wall of the groove forms a circumferential constraint on the contact finger body, allowing it to slide only along the extension direction of the groove. This limits the direction of movement of the contact finger body, and the elastic force of the elastic element also acts on the contact finger body in the same direction. This prevents the contact finger body from tilting or jamming during extension and retraction, thus facilitating stable contact with the main cable 200. The elastic element is connected to the bottom of the groove. After assembly, the elastic element has a pre-compression value. When the main cable 200 is not clamped, the finger body tends to extend out of the groove under the action of the elastic force. When the main cable 200 enters the clamping space 101 and is clamped, the main cable 200 presses the finger body into the groove. The elastic element further compresses and stores energy, and uses a reaction force to push the finger body against the main cable 200. The extension and retraction of the finger body adaptively adjusts according to the outer diameter of the main cable 200 and the clamping state. At least part of the finger body is located outside the groove, ensuring a reliable contact stroke between the finger body and the main cable 200. When the outer diameter of the main cable 200 is small or there is still a gap after clamping, the part of the finger body extending out of the groove can still contact the main cable 200, maintaining the continuity of the conductive path. The contact finger body slides in contact with the inner wall of the slide groove. The electrical connection between the contact finger body and the fixed clamp 2 is established through the sliding contact surface. The contact finger body remains conductive with the fixed clamp 2 throughout its entire reciprocating stroke. The pre-compression of the elastic element determines the initial extension length and initial contact force of the contact finger body. After the main cable 200 enters the clamping space 101, the retraction of the contact finger body corresponds to the outer diameter of the main cable 200. The total compression of the elastic element is equal to the sum of the pre-compression and the retraction, and the contact force of the contact finger body on the main cable 200 is thus determined. The magnitude of the contact force can be adjusted by selecting the elastic element. The slide groove also limits the maximum extension position of the contact finger body, preventing it from coming out of the slide groove, thus ensuring the assembly reliability of the spring contact finger 4. The fixed clamping block 2 serves as the clamping reference. After the spring contact finger 4 is embedded in the fixed clamping block 2, the contact direction of the contact finger body is consistent with the clamping direction of the fixed clamping block 2. The contact force of the contact finger body on the main cable 200 and the clamping force of the fixed clamping block 2 on the main cable 200 work together to make the position of the main cable 200 more stable in the clamping space 101.

[0034] In some embodiments, the slide is a circular slot formed in the fixed clamping block 2 facing the clamping space 101. The finger body is a cylindrical conductor that fits into the circular slot with a clearance. The outer peripheral surface of the finger body slides in contact with the inner wall of the circular slot, and the finger body maintains an electrical connection with the fixed clamping block 2 during sliding. The elastic element is a helical compression spring, with one end abutting the bottom of the slide and the other end abutting the end of the finger body located in the slide. The connection between the elastic element and the bottom of the slide can also be welding or riveting. The length of the finger body extending out of the slide is less than the length of the finger body located in the slide. Even at the maximum compression stroke, part of the finger body remains within the slide, thus maintaining the guiding effect of the slide on the finger body. A guide chamfer can also be provided at the opening of the slide to facilitate the assembly of the finger body and reduce scratches on the surface of the finger body by the edge of the opening.

[0035] Please see Figure 2 In an embodiment of the present invention, the drain line clamp 10 further includes an operating ring 6, which is connected to one end of the lead screw 5, and the surface of the operating ring 6 is provided with anti-slip texture.

[0036] The operating ring 6 is a ring-shaped operating component connected to one end of the lead screw 5 to drive the lead screw 5 to rotate. The operating ring 6 can serve as a manual handle, held and rotated by the operator to drive the lead screw 5. The operating ring 6 can also serve as a transmission interface for external driving tools; the external driving tool drives the lead screw 5 to rotate after connecting to the operating ring 6. The anti-slip texture is a textured structure set on the surface of the operating ring 6 to increase surface friction. The anti-slip texture can be knurled, raised ridges, grooves, or a combination of the above textures.

[0037] Understandably, the operating ring 6 increases the operating arm of the lead screw 5, allowing operators to rotate the ring 6 with less hand force, making it easier for the lead screw 5 to drive the movable clamp 3 to clamp the main cable 200. The ring-shaped structure of the operating ring 6 facilitates gripping and connection to external drive sleeves and other transmission components. Both manual and electric operation are achieved through the same interface, allowing for flexible selection of the clamp operation method based on on-site working conditions. The anti-slip texture on the surface of the operating ring 6 increases friction between the operator's hand and the ring 6 when rotating, reducing the likelihood of relative slippage and ensuring more effective force application. In scenarios where an external drive tool rotates the operating ring 6, the anti-slip texture also increases friction between the ring 6 and the transmission components, reducing slippage during transmission and ensuring stable transmission of the driving torque to the lead screw 5. The operating ring 6 is connected to one end of the lead screw 5, and the other end of the lead screw 5 engages with the movable clamping block 3. The operating ring 6 and the clamping space 101 are located at opposite ends of the lead screw 5. When the operator rotates the operating ring 6, their hands are kept away from the clamping space 101 and the main cable 200, ensuring operational safety. The anti-slip texture also ensures that the operating ring 6 remains grippable in wet and dirty outdoor working environments. Even when the operator is wearing insulated gloves, they can still stably rotate the operating ring 6, enhancing the adaptability of the clamp to manual working environments.

[0038] In some embodiments, the operating ring 6 is a circular ring-shaped component, and the inner ring of the operating ring 6 is connected to the end of the lead screw 5. The connection between the operating ring 6 and the lead screw 5 can be integrally formed, welded, or pinned. The anti-slip texture is a knurled pattern provided on the outer circumferential surface of the operating ring 6, or the anti-slip texture can be raised ridges distributed at intervals along the circumference of the operating ring 6. An insulating sleeve can also be provided on the surface of the operating ring 6 to improve the insulation safety during manual operation. The outer diameter of the operating ring 6 is larger than the outer diameter of the lead screw 5, and the end face of the operating ring 6 facing the lead screw 5 can also serve as the axial positioning surface of the external transmission component.

[0039] In an embodiment of the present invention, there are multiple spring contacts 4, which are arranged at intervals.

[0040] The operating ring 6 is a ring-shaped operating component connected to one end of the lead screw 5 to drive the lead screw 5 to rotate. The operating ring 6 can serve as a manual handle, held and rotated by the operator to drive the lead screw 5. The operating ring 6 can also serve as a transmission interface for external driving tools; the external driving tool drives the lead screw 5 to rotate after connecting to the operating ring 6. The anti-slip texture is a textured structure set on the surface of the operating ring 6 to increase surface friction. The anti-slip texture can be knurled, raised ridges, grooves, or a combination of the above textures.

[0041] Understandably, the operating ring 6 increases the operating arm of the lead screw 5, allowing operators to rotate the ring 6 with less hand force, making it easier for the lead screw 5 to drive the movable clamp 3 to clamp the main cable 200. The ring-shaped structure of the operating ring 6 facilitates gripping and connection to external drive sleeves and other transmission components. Both manual and electric operation are achieved through the same interface, allowing for flexible selection of the clamp operation method based on on-site working conditions. The anti-slip texture on the surface of the operating ring 6 increases friction between the operator's hand and the ring 6 when rotating, reducing the likelihood of relative slippage and ensuring more effective force application. In scenarios where an external drive tool rotates the operating ring 6, the anti-slip texture also increases friction between the ring 6 and the transmission components, reducing slippage during transmission and ensuring stable transmission of the driving torque to the lead screw 5. The operating ring 6 is connected to one end of the lead screw 5, and the other end of the lead screw 5 engages with the movable clamping block 3. The operating ring 6 and the clamping space 101 are located at opposite ends of the lead screw 5. When the operator rotates the operating ring 6, their hands are kept away from the clamping space 101 and the main cable 200, ensuring operational safety. The anti-slip texture also ensures that the operating ring 6 remains grippable in wet and dirty outdoor working environments. Even when the operator is wearing insulated gloves, they can still stably rotate the operating ring 6, enhancing the adaptability of the clamp to manual working environments.

[0042] In some embodiments, the operating ring 6 is a circular ring-shaped component, and the inner ring of the operating ring 6 is connected to the end of the lead screw 5. The connection between the operating ring 6 and the lead screw 5 can be integrally formed, welded, or pinned. The anti-slip texture is a knurled pattern provided on the outer circumferential surface of the operating ring 6, or the anti-slip texture can be raised ridges distributed at intervals along the circumference of the operating ring 6. An insulating sleeve can also be provided on the surface of the operating ring 6 to improve the insulation safety during manual operation. The outer diameter of the operating ring 6 is larger than the outer diameter of the lead screw 5, and the end face of the operating ring 6 facing the lead screw 5 can also serve as the axial positioning surface of the external transmission component.

[0043] Please see Figure 2 In an embodiment of the present invention, a first arc-shaped clamping groove 21 and a second arc-shaped clamping groove 31 are respectively formed on the opposite side of the fixed clamping block 2 and the movable clamping block 3, and the curvature of the first arc-shaped clamping groove 21 and the curvature of the second arc-shaped clamping groove 31 are set to be different.

[0044] The first arc-shaped clamping groove 21 is an arc-shaped groove formed on the side of the fixed clamping block 2 facing the clamping space 101, and the second arc-shaped clamping groove 31 is an arc-shaped groove formed on the side of the movable clamping block 3 facing the clamping space 101. The two arc-shaped clamping grooves are arranged opposite to each other and together form the clamping space 101 for accommodating the main cable 200. The groove surface shape of the arc-shaped clamping groove is adapted to the outer peripheral surface of the cylindrical main cable 200. Curvature is a parameter describing the degree of curvature of a curve. Curvature and radius of curvature are reciprocals of each other. The greater the curvature, the greater the degree of curvature of the groove surface, and the smaller the outer diameter of the conductor that it can accommodate. The curvature of the first arc-shaped clamping groove 21 and the curvature of the second arc-shaped clamping groove 31 are set differently, which means that the degree of curvature of the two arc-shaped clamping grooves is different, that is, the radius of curvature of the two arc-shaped clamping grooves is not equal. The arc-shaped clamping groove extends along the axial direction of the main cable 200. The extension length of the arc-shaped clamping groove corresponds to the dimensions of the fixed clamping block 2 and the movable clamping block 3 in the axial direction of the conductor. The groove depth of the arc-shaped clamping groove is adapted to the radius of the conductor to which it is adapted.

[0045] Understandably, the main cable 200 is a cylindrical conductor, and the groove surface of the arc-shaped clamp can form line or surface contact with the outer circumference of the main cable 200. The clamping contact area is larger than that of a planar clamp, thus improving the stability of clamping and the effectiveness of conductive contact. With the two arc-shaped clamps having different curvatures, the clamping space 101 can accommodate main cables 200 with a wider range of outer diameters. When the outer diameter of the main cable 200 is large, it mainly fits against the arc-shaped clamp with smaller curvature. When the outer diameter of the main cable 200 is small, it can enter the arc-shaped clamp with larger curvature more deeply and be clamped. Main cables 200 with different outer diameters can obtain a fitting groove surface that matches their own outer diameter within the clamping space 101, thus enhancing the clamp's adaptability to various conductor specifications. The difference in curvature between the two arc-shaped clamping grooves also causes the main cable 200 to be asymmetrically wrapped and constrained within the clamping space 101. This suppresses rotation and axial movement of the conductor within the clamping space 101 after clamping, thus improving clamping stability. During clamping, the main cable 200 first contacts and positions itself with the arc-shaped clamping groove with the smaller curvature. As the movable clamping block 3 moves closer, the arc-shaped clamping groove with the larger curvature wraps around the other side of the main cable 200. Under the combined constraint of the two arc-shaped clamping grooves, the main cable 200 is positioned in the middle of the clamping space 101, ensuring a stable clamping position and preventing the conductor from easily slipping out laterally during clamping. The wrapping of the arc-shaped clamping grooves around the conductor also disperses the clamping force circumferentially along the conductor, reducing the clamping pressure per unit area on the conductor surface. This prevents indentations and deformation at the point where the main cable 200 contacts the arc-shaped clamping groove, which helps maintain the conductor's mechanical strength and current-carrying capacity.

[0046] In some embodiments, the radius of curvature of the first arc-shaped clamping groove 21 is greater than the radius of curvature of the second arc-shaped clamping groove 31. The first arc-shaped clamping groove 21 of the fixed clamping block 2 is used to accommodate and support the main cable 200 with a larger outer diameter, while the second arc-shaped clamping groove 31 of the movable clamping block 3 is used to cover the main cable 200 with a smaller outer diameter. The groove surfaces of the first arc-shaped clamping groove 21 and the second arc-shaped clamping groove 31 may also be provided with anti-slip teeth distributed along the extension direction of the groove surfaces. When clamped, the anti-slip teeth press against the surface of the main cable 200 to increase the clamping friction. The ratio of the radius of curvature of the first arc-shaped clamping groove 21 to the radius of curvature of the second arc-shaped clamping groove 31 is set according to the range of wire diameters that the clamp needs to adapt to. The groove surfaces of the first arc-shaped clamping groove 21 and the second arc-shaped clamping groove 31 may also be knurled or plated to improve the conductive contact and wear resistance between the groove surfaces and the main cable 200.

[0047] In an embodiment of the present invention, the end face of the finger body facing away from the fixing block 2 is constructed as an arc-shaped end face, and multiple protrusions are formed on the arc-shaped end face.

[0048] The arc-shaped end face is the end face of the finger body facing the clamping space 101. This end face is constructed as an arc shape, and its shape is adapted to the outer peripheral surface of the cylindrical main cable 200. The protruding structure is a structure formed on the arc-shaped end face and protrudes from the curved surface of the arc-shaped end face. Multiple protruding structures are distributed on the arc-shaped end face, and the shape of the protruding structure can be hemispherical, conical, prismatic, or cylindrical. The bending direction of the arc-shaped end face matches the outer peripheral surface of the main cable 200. When the finger body presses against the main cable 200, the middle part of the arc-shaped end face contacts the main cable 200 first, and then the two sides of the arc-shaped end face adhere to the outer peripheral surface of the main cable 200, thus covering the main cable 200.

[0049] Understandably, with the contact surface of the finger body contacting the main cable 200 being arc-shaped, when the finger body presses against the main cable 200, the arc-shaped end face conforms to the outer circumference of the conductor, increasing the contact area between the finger body and the main cable 200, resulting in a more uniform distribution of contact pressure and improved conductivity. The multiple protrusions formed on the arc-shaped end face create localized stress concentration when the finger body presses against the main cable 200. The tips of these protrusions exert significant local pressure on the conductor surface, breaking through the oxide film and contaminant layer, and forming effective contact with the conductor's metal substrate, thus reducing contact resistance. Multiple protrusions form multiple contact points with the main cable 200, and these points conduct in parallel. Even if some contact points fail, the remaining contact points remain conductive, improving the reliability of the electrical connection between the finger body and the main cable 200. After the raised structure is pressed into the conductor surface, it can also form a mechanical engagement between the contact finger body and the main cable 200, reducing the slippage of the contact finger body along the conductor surface and maintaining a stable contact position under vibration. The oxide film on the conductor surface is the main factor increasing contact resistance. The resistivity of the oxide film is much higher than that of the conductor's metal substrate. The raised structure generates a large local pressure with a small contact area, which can break the oxide film under the limited elastic force provided by the elastic element. The contact finger body has high utilization efficiency of the contact force, and the specifications of the elastic element do not need to be increased due to the presence of the oxide film. The gaps formed between multiple raised structures can also accommodate the crushed oxide film debris and surface dirt, and the contact between the tip of the raised structure and the conductor's metal substrate is not easily separated by debris.

[0050] In some embodiments, the protrusion structure is a hemispherical protrusion, with multiple hemispherical protrusions evenly distributed on the arc-shaped end face. The protrusion structure can also be a conical protrusion, with the apex of the conical protrusion exhibiting greater local pressure when pressed against the main cable 200. The radius of curvature of the arc-shaped end face is close to the outer radius of the adapted main cable 200, forming a larger contact area between the arc-shaped end face and the outer circumferential surface of the conductor. The contact finger body and the protrusion structure can be integrally molded to reduce the number of contact interfaces. The height of the protrusion structure is smaller than the radius of curvature of the arc-shaped end face. When the protrusion structure presses against the main cable 200, it preferentially contacts the surface of the conductor, and the arc-shaped end face subsequently conforms to the outer circumferential surface of the conductor.

[0051] In some embodiments of the present invention, a plurality of spring fingers 4 are arranged at intervals along the axial and / or circumferential direction of the main cable 200, and the bodies of the plurality of fingers form a plurality of contact points distributed along the surface of the main cable 200 within the clamping space 101, and the plurality of contact points are connected in parallel via the fixing clamp 2.

[0052] In this context, the axial direction of the main cable 200 refers to the direction in which the main cable 200 extends along its length, while the circumferential direction refers to the direction around the axis of the main cable 200. When multiple spring contacts 4 are spaced apart along the axial direction of the main cable 200, the bodies of the multiple contacts sequentially abut against the main cable 200 along its length. When multiple spring contacts 4 are spaced apart along the circumferential direction of the main cable 200, the bodies of the multiple contacts abut against the main cable 200 from different angular positions around its circumference. Multiple contact points are multiple independent contact positions formed by the multiple contact bodies and the surface of the main cable 200. Multiple contact points are connected in parallel via the fixing clamp 2, meaning that multiple contact points are electrically connected to the fixing clamp 2 respectively, and the multiple contact points converge at the fixing clamp 2 to form a parallel conductive circuit.

[0053] Understandably, the surface of the main cable 200 may exhibit localized variations in condition, such as oxidation, dirt, and scratches. The contact resistance of a single contact point may increase due to this localized degradation. With multiple contact points distributed across the surface of the main cable 200, the contact resistances of each point are connected in parallel, resulting in a significantly lower overall contact resistance compared to a single-point contact. This improves the conductivity of the current-carrying circuit. Even when some contact points fail due to localized oxidation or dirt on the surface of the main cable 200's conductors, the remaining contact points remain conductive, ensuring the conductive path is not interrupted by a single-point failure and guaranteeing the redundancy and reliability of the electrical connection. The dispersed arrangement of multiple contact points also makes the current distribution at the clamping point more uniform, preventing localized overheating caused by current concentration at a single contact point and suppressing the temperature rise of the clamp when carrying large currents. The distribution of the contact fingers along the axial and / or circumferential directions of the main cable 200 further ensures that the clamping force is evenly distributed along the conductor surface, making the positioning of the main cable 200 within the clamping space 101 more stable and improving the clamp's resistance to movement under vibration.

[0054] In some embodiments of the present invention, the protrusion structure includes a first protrusion located in the middle region of the arc-shaped end face and a second protrusion located in the edge region of the arc-shaped end face, wherein the height of the first protrusion is greater than the height of the second protrusion, and the radius of curvature of the top end of the first protrusion is smaller than the radius of curvature of the top end of the second protrusion.

[0055] Understandably, when the contact finger body abuts against the main cable 200, the first protrusion, due to its larger height, preferentially contacts the surface of the main cable 200. The first protrusion has a smaller radius of curvature at its tip, resulting in higher local pressure upon contact. Under this high local pressure, the oxide film and contaminant layer on the conductor surface are broken, and the first protrusion forms effective contact with the conductor's metal substrate. As the contact finger body continues to press into the main cable 200, the second protrusion subsequently contacts the conductor surface. The second protrusion has a larger radius of curvature at its tip, resulting in lower pressure upon contact. The second protrusion, with its larger contact area, undertakes the primary task of current conduction. The first protrusion performs the film-breaking function, while the second protrusion performs the current-conducting function. These functions are accomplished by different protrusions, achieving both the high local pressure required for film breaking and the large contact area required for current conduction on the same contact finger body. The clean metal interface formed after film breaking is covered by the second protrusion with its larger contact area, optimizing the current density distribution at the contact interface and maintaining a low contact resistance throughout the entire contact area of ​​the contact finger body. After the first protrusion breaks through the oxide film, the resulting debris is pushed into the gap between adjacent protrusions by the contact action of the contact finger body. The debris does not block the contact between the second protrusion and the metal substrate of the wire, and the cleanliness of the contact interface is maintained.

[0056] Please see Figure 3 The present invention also proposes an electric contact device 100, including a drain wire clamp 10 and a clamp installation tool 20. The drain wire clamp 10 is the same as the drain wire clamp 10 in the above embodiment. The clamp installation tool 20 includes an insulating rod 201, a drive motor 202, a transmission sleeve 203 and a control module. The motor housing of the drive motor 202 is disposed on the insulating rod 201. The transmission sleeve 203 is connected to the rotating shaft of the drive motor 202 and is adapted to be connected to the lead screw 5. The control module is electrically connected to the drive motor 202 and is used to control the start, stop and rotation direction of the drive motor 202.

[0057] The live-line connection device 100 is used to connect the drain wire 300 to the main cable 200 during live-line connection operations. The insulating rod 201 is a long rod-shaped component with insulating properties, providing insulating support for the clamp installation tool 20, allowing operators to work at a safe distance from live parts. The drive motor 202 is the power source for the clamp installation tool 20. The motor housing is the outer casing of the drive motor 202. The motor housing being located on the insulating rod 201 means that the drive motor 202 is fixedly installed on the insulating rod 201 using the motor housing. The fixing method between the motor housing and the insulating rod 201 can be a clamp connection, flange connection, or threaded connection. The installation position of the drive motor 202 on the insulating rod 201 is close to the end of the insulating rod 201 where the drain wire clamp 10 is connected, in order to shorten the transmission distance between the transmission sleeve 203 and the drain wire clamp 10. The transmission sleeve 203 is a sleeve-shaped transmission component. One end of the transmission sleeve 203 is connected to the rotating shaft of the drive motor 202, and the other end is adapted to be connected to the lead screw 5 of the lead wire clamp 10, for transmitting the rotation of the drive motor 202 to the lead screw 5. The control module is the control center of the clamp installation tool 20. The control module is electrically connected to the drive motor 202 and is used to send start / stop and rotation direction control signals to the drive motor 202.

[0058] It is understandable that the main cable 200 is energized during live-line connection work, and the manual installation of the clamp by the operator poses a safety risk. The live-line connection device 100 installs the drain wire clamp 10 onto the clamp installation tool 20. The operator holds the insulating rod 201 and lifts the drain wire clamp 10 to the position of the main cable 200. The control module controls the drive motor 202 to start and rotate in the clamping direction. The shaft of the drive motor 202 drives the transmission sleeve 203 to rotate, and the transmission sleeve 203 transmits the rotation to the lead screw 5. The lead screw 5 drives the movable clamping block 3 to clamp the main cable 200. After clamping, the control module controls the drive motor 202 to stop, and the electrical connection between the clamp and the main cable 200 is established. When it is necessary to remove the clamp, the control module controls the drive motor 202 to rotate in the opposite direction, and the movable clamping block 3 releases the main cable 200. Throughout the installation and dismantling process, an insulating rod 201 remains between the operator and the live main cable 200. The electrical distance between the operator and the live conductor is ensured by the insulating rod 201, thus improving the safety of live-line work. The driving force provided by the drive motor 202 is stable and controllable, and the clamping process does not rely on manual force from the operator, improving the consistency of clamping quality. The length and insulation performance of the insulating rod 201 are matched to the operating voltage level. When the operator holds the end of the insulating rod 201 away from the drain wire clamp 10, the electrical distance between the operator and the live conductor is maintained in accordance with safety regulations. The drive motor 202 and control module are all integrated into the end of the insulating rod 201 closest to the drain wire clamp 10. The clamp installation tool 20 has a compact structure, allowing a single person to complete continuous lifting, positioning, and clamping operations. During operation, the drain wire clamp 10 is first installed on the transmission sleeve 203. The operator lifts the insulating rod 201 to allow the main cable 200 to enter the clamping space 101, and then starts the drive motor 202 to complete the clamping. After clamping, the clamp installation tool 20 separates from the clamp and is removed with the insulating rod 201, leaving the clamp on the main cable 200. The entire operation does not require climbing the pole, thus improving work efficiency and reducing the labor intensity of the operators. The transmission sleeve 203 serves as an intermediate transmission component between the drive motor 202 and the lead screw 5. The connection and separation between the transmission sleeve 203 and the lead screw 5 are simple. After installing one clamp, the clamp installation tool 20 can quickly connect to the next clamp, ensuring the efficiency of continuous operation. Combining the aforementioned structure of the drain line clamp 10, the end of the lead screw 5 can be connected to the operating ring 6. The transmission sleeve 203 is sleeved on the outside of the operating ring 6 and drives the operating ring 6 to rotate. A complete transmission chain is formed between the drive motor 202, the transmission sleeve 203, the operating ring 6 and the lead screw 5. After the main cable 200 is clamped, the contact body of the spring contact finger 4 continues to maintain elastic contact with the main cable 200 under the action of the elastic element. The main cable 200 is connected to the drain line 300 through the contact body and the fixing clamp 2. The reliability of the electrical connection during the operation of the clamp is guaranteed by the structure of the clamp itself.The control module is electrically connected to the drive motor 202. The control signal output by the control module is amplified by the drive circuit and drives the drive motor 202 to run. The start, stop and rotation direction of the drive motor 202 respond to the instructions of the control module. The operation of the wire clamp installation tool 20 is under control. The operator can accurately grasp the timing of clamping and releasing through the control module.

[0059] In some embodiments, the insulating rod 201 is an epoxy resin insulating rod 201, and the length and insulation class of the insulating rod 201 are selected according to the operating voltage level. The drive motor 202 is a DC geared motor, powered by a battery, which can be installed inside the insulating rod 201 or on the motor housing. The transmission sleeve 203 is fixedly installed on the output shaft of the drive motor 202, and the end of the transmission sleeve 203 facing the clamp is sleeved on the operating ring 6 at the end of the lead screw 5. The inner wall of the transmission sleeve 203 and the operating ring 6 transmit torque through a profile fit. The control module includes a control circuit board and a drive circuit, and the control module can be set inside the motor housing. The control module controls the rotation direction of the drive motor 202. When the drive motor 202 rotates forward, the movable clamp 3 moves toward the fixed clamp 2; when the drive motor 202 rotates in reverse, the movable clamp 3 moves away from the fixed clamp 2. The clamping and releasing actions are completed by the same drive motor 202. The battery is a rechargeable lithium battery, and the clamp installation tool 20 has no external power cord, which is convenient for use in field working environments.

[0060] The live-line contact device 100 has at least the following technical effects: the operator can lift the drain wire clamp 10 to the live main cable 200 by holding the insulating rod 201; the control module controls the drive motor 202 to drive the lead screw 5 to rotate through the transmission sleeve 203; the installation and removal of the clamp is completed electrically at a position away from the live body; the electrical distance between the operator and the live body is ensured by the insulating rod 201, thus improving the safety of live-line work; the driving force of the drive motor 202 is stable and controllable, and the clamping process does not rely on the operator's manual force, thus improving the consistency of clamping quality; after the main cable 200 is clamped, the spring contact finger 4 continues to maintain elastic contact with the main cable 200; the reliability of the electrical connection between the main cable 200 and the drain wire 300 during the operation of the clamp is ensured by the structure of the clamp itself.

[0061] Please see Figure 3 In an embodiment of the present invention, the wire clamp installation tool 20 further includes a remote controller 204, which is communicatively connected to the control module and is used to send control commands to the control module to control the start, stop and rotation direction of the drive motor 202.

[0062] The remote controller 204 is a separate operating terminal used to remotely send control commands. The remote controller 204 communicates with the control module via wireless radio frequency communication, Bluetooth communication, or infrared communication. Control commands include commands to start, stop, rotate forward, and rotate reverse on the drive motor 202. A forward rotation command corresponds to the clamping action of the wire clamp, and a reverse rotation command corresponds to the releasing action of the wire clamp.

[0063] Understandably, the remote control 204 allows operators to operate further away from the live main cable 200. After raising the clamp installation tool 20 to the main cable 200, the operator can retreat to the ground or a safe area and send control commands to the control module via the remote control 204. The control module receives and parses the commands, then controls the drive motor 202 to perform corresponding start, stop, and steering actions. Clamping and releasing operations are completed remotely. Operators no longer need to continuously hold and operate near the insulating rod 201, allowing for more flexible operating postures and facilitating unified command of the operation rhythm when multiple people are working together. Wireless communication between the remote control 204 and the control module ensures that control command transmission is not limited by operating distance or posture, improving both the convenience and safety of live-line work. Remote operation also allows operators to work from positions with good visibility, enabling them to flexibly choose their position based on site conditions, away from areas under conductors. The communication connection between the remote control 204 and the control module is paired; the control module only responds to control commands from the paired remote control 204, minimizing interference when multiple devices are operating simultaneously.

[0064] In some embodiments, the remote controller 204 is equipped with a forward rotation button, a reverse rotation button, and a stop button, corresponding to clamping, releasing, and stopping commands, respectively. The remote controller 204 communicates with the control module via 2.4GHz wireless radio frequency, or via Bluetooth. The remote controller 204 may also be equipped with status indicator lights to display the operating status reported by the control module. The remote controller 204 may also be equipped with an emergency stop button, allowing the operator to immediately stop the drive motor 202 in case of any abnormal situation during operation.

[0065] In an embodiment of the present invention, the control module includes a current detection unit and a processing unit. The current detection unit is used to detect the load current of the drive motor 202 and output a current detection signal. The processing unit is electrically connected to the current detection unit and is used to determine that the main cable 200 is clamped in place when the load current is greater than or equal to a preset current threshold, and to control the drive motor 202 to stop.

[0066] The current detection unit is a circuit unit used to detect the operating current of the drive motor 202. The current detection unit can be a sampling resistor connected in series in the power supply circuit of the drive motor 202 along with a signal conditioning circuit, or it can be a Hall current sensor. The load current is the operating current of the drive motor 202 when driving a load. The magnitude of the load current changes with the torque of the load driven by the drive motor 202. The load current can be detected continuously or sampled according to a set sampling period. The current detection signal can be a voltage signal or a digital signal proportional to the load current. The preset current threshold is a pre-set current critical value used to determine the clamping state. The processing unit is a unit in the control module used for signal processing and logic determination. The processing unit can be a microcontroller. The processing unit receives the current detection signal output by the current detection unit, compares the load current with the preset current threshold, and outputs a control signal to the drive motor 202 based on the comparison result.

[0067] Understandably, during the process where the drive motor 202 drives the lead screw 5 to rotate via the transmission sleeve 203 and drives the movable clamping block 3 to clamp the main cable 200, the clamping reaction force on the movable clamping block 3 increases with the deepening of the clamping, the resistance torque of the lead screw 5 increases accordingly, the load torque of the drive motor 202 rises accordingly, and the load current also rises. After the main cable 200 is clamped in place, the movable clamping block 3 can no longer move, the rotational resistance of the lead screw 5 increases sharply, the load torque of the drive motor 202 rises rapidly to near the stall state, and the load current rises to a relatively high level. This change in load current has a clear correspondence with the clamping process, and the load current can be used as a characterizing quantity of the clamping state. The current detection unit detects the load current in real time and outputs a current detection signal. The processing unit compares the load current with a preset current threshold. When the load current is greater than or equal to the preset current threshold, it indicates that the main cable 200 has been clamped in place, and the processing unit immediately controls the drive motor 202 to stop, and the clamping action ends automatically. The clamping degree is determined by converting mechanical quantities into electrical signals. The determination process requires no manual intervention, and the standard for judging proper clamping is uniform, ensuring clamping quality unaffected by differences in operator experience. Upon determining proper clamping, the processing unit promptly stops the drive motor 202, reducing the time the drive motor 202 is in a stall state. This reduces overheating of the motor windings and overload damage to transmission components, ensuring the operational reliability of the clamp installation tool 20. The preset current threshold provides a safety margin; when the load current reaches the preset threshold, the main cable 200 is reliably clamped before the drive motor 202 enters a continuous stall state. This ensures that the clamping force meets requirements while also protecting the drive motor 202 from overload. The current detection unit and processing unit are integrated into the control module. The detection and determination of the clamping state are completed internally within the clamp installation tool 20, eliminating the need for external detection equipment and maintaining the integrity and portability of the device. After clamping is complete, the drive motor 202 automatically stops, and the lead screw 5 stops rotating. The self-locking characteristic of the threaded drive keeps the movable clamping block 3 in the clamped position, and the clamping state is maintained even after the drive motor 202 stops. There is an inrush current at the moment the drive motor 202 starts. This inrush current differs from the load current at the time of clamping in terms of duration and variation. The processing unit can determine this by considering the duration of the load current. Clamping is only determined when the load current is continuously greater than or equal to a preset current threshold for a set duration, thus improving the accuracy of the determination.

[0068] In some embodiments, the current detection unit is a sampling resistor connected in series in the power supply circuit of the drive motor 202. The voltage across the sampling resistor is converted into a current detection signal by a signal conditioning circuit and then input to the processing unit. The current detection unit can also be a Hall current sensor. The preset current threshold is set according to the rated operating current and stall current of the drive motor 202. The preset current threshold is less than the stall current of the drive motor 202 and greater than the normal operating current during the clamping process. The processing unit is a microcontroller. The microcontroller stores the preset current threshold and has pre-set programs for comparison judgment and shutdown control. The processing unit can also be connected to an alarm. When the processing unit detects a continuous abnormal load current, it controls the alarm to issue an audible and visual alarm. The processing unit delays for a set time after the drive motor 202 starts before starting the judgment to avoid the inrush current at the moment the drive motor 202 starts and reduce false judgments.

[0069] In an embodiment of the present invention, the clamp installation tool 20 further includes an image acquisition device, which is disposed on the insulating rod 201 and is used to acquire visual images of the drain wire clamp 10.

[0070] The image acquisition device is used to acquire image information, and it can be a camera. The image acquisition device is mounted on the insulating rod 201, facing the drain wire clamp 10, so that the drain wire clamp 10 is within the image acquisition field of view. The visual images include the relative position image of the drain wire clamp 10 and the main cable 200, as well as the clamping state image of the drain wire clamp 10.

[0071] Understandably, during live-line connection work, the drain wire clamp 10 is raised to a high position relative to the main cable 200. Workers on the ground cannot directly observe the alignment and clamping status of the clamp with the main cable 200. An image acquisition device positioned on the insulating rod 201 and facing the drain wire clamp 10 allows for close-range visual image acquisition of the clamp. Workers can use this image to confirm the relative position of the clamp and the main cable 200, guiding the insulating rod 201 to adjust the clamp's posture and position, ensuring the main cable 200 accurately enters the clamping space 101. After clamping, workers can also check the clamping status against the main cable 200 using the visual image, confirming the installation effect. The positioning and installation effect confirmation of the clamp are aided by visual images, improving the accuracy of the work and the controllability of the installation quality. The image acquisition device moves synchronously with the insulating rod 201, its field of view always following the drain wire clamp 10. Workers can continuously obtain real-time images of the clamp while adjusting its position, ensuring continuous operational guidance. In nighttime or low-light emergency repair scenarios, visual images can also provide operators with information on the status of the clamps, thus enhancing the device's adaptability to the working environment.

[0072] In some embodiments, the image acquisition device is a camera, which is mounted on one end of the insulating rod 201 near the drain wire clamp 10, with the camera lens facing the clamping space 101 of the drain wire clamp 10. The camera is communicatively connected to a display terminal, and the visual images acquired by the camera are transmitted in real time to a handheld display terminal held by the operator. The display terminal can be integrated into the remote control 204. The camera can also be equipped with a supplementary light to adapt to low-light working environments. The image acquisition device can also store the visual images in a memory for easy quality traceability and archiving management after the operation.

[0073] In some embodiments, the components of the drain wire clamp 10 adopt a modular design. The fixed clamp 2, movable clamp 3, spring contact finger 4, and lead screw 5 can all be disassembled and replaced individually. When any component is worn or damaged, only the corresponding component needs to be replaced, thus reducing the maintenance cost of the clamp. As an elastic contact component, the elastic force of the spring contact finger 4 will decrease after long-term use. The modular spring contact finger 4 can be replaced as a whole, and the conductivity of the clamp can be restored after maintenance, thus extending the overall service life of the clamp. Fixed clamps 2 and movable clamps 3 of different specifications can also be used in combination with the same housing 1. By changing the clamps, they can be adapted to main cables 200 with different wire diameter ranges, thus improving the serialization of the clamp products.

[0074] In some embodiments, the operation process of the live-line contact device 100 is as follows: Before operation, the operator connects the drain line clamp 10 to the clamp installation tool 20, checks the clamp structure and the status of the electric drive system, and sets the clamping parameters according to the on-site operation requirements; during the positioning and clamping stage, the operator positions the drain line clamp 10 at the part of the main cable 200 that needs to be drained using the insulating rod 201, the control module controls the drive motor 202 to start, the lead screw 5 drives the movable clamping block 3 to move, the clamping space 101 closes and clamps the main cable 200, and the spring contact finger 4 maintains elastic contact with the main cable 200; during the locking and feedback stage, the control module detects the clamping status, controls the drive motor 202 to stop after confirming that the clamping is in place, and provides feedback status information to the operator. When an abnormal clamping is detected, an alarm is issued and the operation stops; after the operation is completed, the clamp installation tool 20 is detached from the drain line clamp 10, and the operator retrieves the clamp installation tool 20. Throughout the entire process, there is no need for close contact with the live main cable 200. The drain wire clamp 10 adopts a modular design, and the drain wire clamp 10 and the clamp installation tool 20 are detachably connected, which facilitates the maintenance and replacement of the clamp; the housing 1 and the insulating components are made of high-strength engineering plastics or epoxy resin to ensure insulation safety in live working environments.

[0075] The drain wire clamp 10 and the live connection device 100 provided in this embodiment of the invention drive the movable clamping block 3 to move and clamp the main cable 200 through the cooperation of the lead screw 5 and the limiting structure. The clamping process is stable and controllable and has self-locking retention capability. The spring contact finger 4 maintains elastic contact with the main cable 200 under the action of the elastic element. The clamping gap and the deviation of the conductor surface condition are adaptively compensated. The main cable 200 forms a continuous conductive path with the drain wire 300 through the contact finger body and the fixed clamping block 2, and the reliability of the electrical connection between the main cable 200 and the drain wire 300 is guaranteed. Through the insulating rod 201, drive motor 202, transmission sleeve 203 and control module of the clamp installation tool 20, the installation and removal of the clamp are completed electrically at a position away from the live body, which ensures the personal safety of the operator and improves the work efficiency and the consistency of clamping quality. Multiple spring contacts are arranged at four intervals to form multi-point parallel contact. The arc-shaped clamping groove and its curvature difference design expand the range of wire specifications that the clamp can adapt to. The raised structure on the end face of the contact body improves the conductivity of the contact interface. The configuration of remote control 204, current detection and judgment and image acquisition makes the clamping operation remotely controllable, the clamping status can be automatically judged and the operation process can be visually confirmed, thus improving the overall automation and intelligence level of live-line connection operations.

[0076] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A drainage line clamp, characterized in that, include: case; A fixing block, which is fixed to the housing and is suitable for electrical connection with the drain wire; A movable clamping block is movably disposed in the housing and is disposed opposite to the fixed clamping block, and a clamping space for accommodating the main cable is formed between the movable clamping block and the fixed clamping block; A spring-loaded contact finger, comprising a contact finger body and an elastic element, wherein the elastic element is disposed between the fixed clamping block and the contact finger body, and the contact finger body is disposed toward the clamping space for elastically abutting against the main cable and being electrically connected to the fixed clamping block; A lead screw, rotatably connected to the housing and threadedly connected to the movable clamping block; and... A limiting structure is provided between the housing and the movable clamping block to restrict the rotation of the movable clamping block.

2. The drainage wire clamp as described in claim 1, characterized in that, The fixed clamping block has a sliding groove, the elastic element is connected to the bottom of the sliding groove, and the touch finger body slides in cooperation with the sliding groove and is at least partially located outside the sliding groove.

3. The drainage wire clamp as described in claim 1, characterized in that, The drain line clamp also includes an operating ring, which is connected to one end of the lead screw, and the surface of the operating ring is provided with anti-slip texture.

4. The drainage wire clamp as described in claim 1, characterized in that, The number of spring contacts is multiple, and the multiple spring contacts are arranged at intervals.

5. The drainage wire clamp as described in claim 1, characterized in that, The fixed clamping block and the movable clamping block have a first arc-shaped clamping groove and a second arc-shaped clamping groove respectively formed on opposite sides, and the curvature of the first arc-shaped clamping groove and the curvature of the second arc-shaped clamping groove are set to be different.

6. The drainage wire clamp as described in claim 1, characterized in that, The end face of the finger body facing away from the fixed clamp is constructed as an arc-shaped end face, and multiple protrusions are formed on the arc-shaped end face.

7. A live-line contact device, characterized in that, include: A drainage line clamp, wherein the drainage line clamp is a drainage line clamp as described in any one of claims 1 to 6; as well as, A wire clamp installation tool includes an insulating rod, a drive motor, a transmission sleeve, and a control module. The motor housing of the drive motor is disposed on the insulating rod. The transmission sleeve is drivenly connected to the shaft of the drive motor and is adapted to be drivenly connected to the lead screw. The control module is electrically connected to the drive motor and is used to control the start, stop, and rotation direction of the drive motor.

8. The live contact device as described in claim 7, characterized in that, The wire clamp installation tool also includes a remote controller, which is communicatively connected to the control module. The remote controller is used to send control commands to the control module to control the start, stop, and rotation direction of the drive motor.

9. The live contact device as described in claim 7, characterized in that, The control module includes: A current detection unit, wherein the current detection unit is used to detect the load current of the drive motor and output a current detection signal; and, The processing unit is electrically connected to the current detection unit and is used to determine that the main cable is clamped in place and control the drive motor to stop when the load current is greater than or equal to a preset current threshold.

10. The live contact device as described in claim 7, characterized in that, The clamp installation tool also includes an image acquisition device, which is located on the insulating rod and is used to acquire visual images of the drain wire clamp.

Images