Mechanically-driven double-margin sealing waterproof cable accessory and construction method thereof

Abstract

The invention provides a mechanical drive double-margin sealing waterproof cable accessory and a construction method thereof, and relates to the technical field of cable intermediate joints, the mechanical drive double-margin sealing waterproof cable accessory comprises a pressing assembly, a first waterproof sleeve and a second waterproof sleeve, one end of the first waterproof sleeve is connected with one end of the second waterproof sleeve; the waterproof structure further comprises two sleeve sealing assemblies, and the two sleeve sealing assemblies block the end of the first waterproof sleeve and the end of the second waterproof sleeve respectively. Each sleeve sealing assembly comprises a screw tube, a nut, a clamping jaw and a rubber block; one end of the solenoid sleeve penetrates through the end, away from the second waterproof sleeve, of the first waterproof sleeve or the end, away from the first waterproof sleeve, of the second waterproof sleeve; the nut is in threaded fit with the peripheral surface of the solenoid; the clamping jaw is fixedly connected to the end, extending out of the first waterproof sleeve or the second waterproof sleeve, of the solenoid, the rubber block is embedded into the inner side of the clamping jaw, and the peripheral face of the rubber block is attached to the inner wall of the clamping jaw.

Description

Technical Field

[0001] This invention relates to the field of cable joint technology, and in particular to a mechanically driven double-margin sealed waterproof cable accessory and its construction method. Background Technology

[0002] Cable joints are key components for connecting segmented cables in the fields of power transmission and communication. They are widely used in underground pipelines, outdoor base stations and other scenarios. Their waterproof performance directly affects the reliability of the cable. Waterproof failure can lead to insulation breakdown and conductor corrosion, causing short circuits or communication interruptions. Currently, there is still room for improvement in existing waterproof solutions.

[0003] Chinese utility model patent CN220797785U discloses a waterproof mechanism for a high-voltage cable intermediate joint, comprising a first waterproof sleeve and a second waterproof sleeve that are joined together. The first and second waterproof sleeves contain reinforcing components for fixing the cable, and a rubber sealing gasket is provided at the joint. The sealing of the left end of the first waterproof sleeve and the right end of the second waterproof sleeve relies on a heat-shrinkable sealing ring and a sliding reinforcing collar. The sliding reinforcing collar is fitted around the outer circumference of the cable, and the heat-shrinkable sealing ring can shrink itself using the temperature of the high-voltage cable sheath, thus tightly adhering to the cable.

[0004] The existing technology still has the following drawbacks: the heat shrink seal ring needs to shrink due to the operating temperature of the cable. In the initial stage of installation, the cable is not heated, and the seal ring cannot shrink and fit the cable in time, which can easily lead to gaps at the ends and allow moisture to enter. Summary of the Invention

[0005] This application provides a mechanically driven, double-margin sealed waterproof cable accessory and its construction method, which solves the problem in the prior art that the heat-shrinkable sealing ring depends on the cable's operating temperature to shrink, resulting in the sealing ring not shrinking and fitting the cable in time, gaps easily forming at the ends, and easy moisture intrusion.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a mechanically driven double-margin sealed waterproof cable accessory, comprising a clamping assembly installed at the cable connection, and a first waterproof sleeve and a second waterproof sleeve sleeved on the outside of the cable and located outside the clamping assembly, wherein one end of the first waterproof sleeve is sealed to one end of the second waterproof sleeve; further comprising two sealing assemblies, the two sealing assemblies respectively sealing the end of the first waterproof sleeve away from the second waterproof sleeve and the end of the second waterproof sleeve away from the first waterproof sleeve, and both sleeved on the outer periphery of the cable; each sealing assembly includes a screw tube, a nut, a claw, and a rubber block; the screw tube sleeved on the outer periphery of the cable, and one end penetrating the end of the first waterproof sleeve away from the second waterproof sleeve or the end of the second waterproof sleeve away from the first waterproof sleeve; the nut is threadedly engaged with the outer peripheral surface of the screw tube; the claw is fixedly connected to the end of the screw tube extending out of the first or second waterproof sleeve, and expands in a funnel shape away from the screw tube; the rubber block is embedded inside the claw and sleeved on the outer periphery of the cable, the outer peripheral surface of the rubber block being in contact with the inner wall of the claw.

[0007] Because the first and second waterproof sleeves are respectively provided with sealing components at their far ends, and each sealing component includes a threaded tube that is fitted around the cable and passes through the corresponding end of the waterproof sleeve, a nut that is threaded to the outer surface of the threaded tube, a claw that is fixed to the end of the threaded tube that extends out of the waterproof sleeve and expands away from the threaded tube in a flared shape, and a rubber block that is embedded inside the claw and fitted around the cable (the outer surface of the claw is in contact with the inner wall of the claw), tightening the nut can drive the claw to contract and squeeze the rubber block to deform elastically so as to tightly fit the outer circumference of the cable. This can achieve sealing without relying on the operating temperature of the cable, thus effectively solving the problem in the prior art that the heat shrink sealing ring needs to rely on the operating temperature of the cable to shrink, which leads to the sealing ring not being able to shrink and fit the cable in time, and gaps easily forming at the ends and moisture easily penetrating.

[0008] As a further improvement to the above solution, the sleeve assembly also includes a sealing gasket, which is sleeved on the outer periphery of the end of the claw near the solenoid and sandwiched between the claw and the first waterproof sleeve or the second waterproof sleeve; thereby forming an additional sealing barrier at the connection between the sleeve assembly and the waterproof sleeve, effectively blocking the path through which moisture may enter from the mating gap between the claw and the end of the waterproof sleeve, and further improving the sealing reliability of the mechanically driven double-margin sealed waterproof cable accessory end.

[0009] As a further improvement to the above solution, a sealing ring A is also included, which is sleeved on the outer periphery of the screw tube and clamped between the end face of the nut and the first waterproof sleeve or the second waterproof sleeve respectively; thereby forming an additional sealing barrier in the end connection area between the sleeve assembly and the first waterproof sleeve or the second waterproof sleeve.

[0010] As a further improvement to the above solution, the claw includes a plurality of strip claws evenly distributed along the circumference, with a gap between two adjacent strip claws, and the strip claws are made of elastic metal material.

[0011] As a further improvement to the above solution, the clamping assembly includes a reinforcing sleeve, two threaded sleeves, and two elastic clamping blocks. The reinforcing sleeve is fitted onto the outside of the cable connection, with external threads on its outer wall and a conical surface whose diameter gradually decreases from the outside to the inside on its inner wall. The two threaded sleeves are respectively threaded into the external threads at both ends of the reinforcing sleeve. The two elastic clamping blocks are respectively fitted onto the outer periphery of the cable at both ends of the reinforcing sleeve, with their outer walls being conical surfaces adapted to the inner wall of the reinforcing sleeve. The larger end of each elastic clamping block is located outside the reinforcing sleeve and abuts against the inner end face of the threaded sleeve. This ensures that the cable connection is fixed, and the tight fit between the elastic clamping blocks and the cable forms a primary seal at the cable connection.

[0012] As a further improvement to the above solution, the elastic clamping block is made of rubber.

[0013] As a further improvement to the above solution, the elastic clamping block has a cylindrical cavity inside, and the cavity has a chamfer at the opening near the large end of the elastic clamping block; the chamfer can prevent the edge of the cavity from scratching the cable sheath when the elastic clamping block is inserted into the cable, and can also disperse the stress at the opening of the cavity during the compression process, preventing the elastic clamping block from cracking due to stress concentration.

[0014] As a further improvement to the above solution, the first waterproof sleeve is provided with an external thread at one end near the second waterproof sleeve, and the second waterproof sleeve is provided with an internal thread at one end near the first waterproof sleeve. The external thread of the first waterproof sleeve and the internal thread of the second waterproof sleeve are threaded together. A sealing ring B is provided between the end face of the first waterproof sleeve near the second waterproof sleeve and the second waterproof sleeve.

[0015] This invention also discloses a construction method for a mechanically driven double-margin sealed waterproof cable accessory, characterized by employing the aforementioned mechanically driven double-margin sealed waterproof cable accessory, comprising the following steps: Step 1: Insert the first waterproof sleeve, the second waterproof sleeve, the two sleeve sealing components, the reinforcing sleeve, the two elastic clamping blocks and the two threaded sleeves into the ends of the two sections of the cable to be connected, respectively, and place each component in the non-connection area of ​​the cable. Step 2: Peel off the insulation layer at the ends of the two cable sections and connect the core wires. Wrap the cable connection with insulating tape for insulation protection. Step 3: Move the reinforcing sleeve to completely cover the cable connection point, insert the two elastic clamping blocks from both ends of the reinforcing sleeve, so that the conical surface of the elastic clamping blocks fits against the inner wall of the reinforcing sleeve, and then screw the two threaded sleeves into both ends of the reinforcing sleeve and tighten them, driving the elastic clamping blocks to radially contract and fit tightly against the cable. Step 4: Move the first waterproof sleeve and the second waterproof sleeve to the outside of the cable connection point, and connect them through threaded engagement to form a seal by squeezing the sealing ring B. Step 5: Adjust the position of the screw tube of the sleeve assembly so that the sealing gasket is clamped between the claw and the end of the corresponding waterproof sleeve, and the sealing ring A is clamped between the nut and the end face of the corresponding waterproof sleeve. Tighten the nut to drive the claw to retract, squeeze the rubber block to deform elastically and fit tightly against the cable, and complete the overall seal. As a further improvement to the above solution, step 5 employs a tiered sealing operation: first, tighten the nut until the sealing gasket adheres to the end of the waterproof sleeve, and hold for 20 to 30 seconds; then continue tightening until the strip claw contracts evenly, and the rubber block initially adheres to the cable; finally, tighten to the preset torque of 8 to 12 N. m, ensure there are no gaps in the rubber block, and at the same time, the tightening torque of the threaded sleeve in step 3 is 15 to 20 N. m, so that the radial shrinkage of the elastic clamping block is 6% to 8% of its initial inner diameter.

[0016] As can be seen from the above technical solutions, the present invention has at least the following technical effects or advantages: 1. Since the ends of the first and second waterproof sleeves are respectively provided with sealing components, and each sealing component includes a threaded tube that is fitted around the cable and passes through the corresponding end of the waterproof sleeve, a nut that is threaded to the outer surface of the threaded tube, a claw that is fixed to the end of the threaded tube that extends out of the waterproof sleeve and expands away from the threaded tube in a flared shape, and a rubber block that is embedded inside the claw and fitted around the cable (the outer surface of the claw is in contact with the inner wall of the claw), tightening the nut can drive the claw to contract and squeeze the rubber block to deform elastically so as to tightly fit the outer circumference of the cable. The sealing can be achieved without relying on the operating temperature of the cable, thus effectively solving the problem in the prior art that the heat shrink sealing ring needs to rely on the operating temperature of the cable to shrink, which leads to the sealing ring not being able to shrink and fit the cable in time, and gaps easily forming at the ends and moisture easily penetrating.

[0017] 2. Since the sleeve assembly also includes a sealing gasket, which is sleeved on the outer periphery of the end of the claw near the solenoid and sandwiched between the claw and the first waterproof sleeve or the second waterproof sleeve, an additional sealing barrier can be formed at the connection between the sleeve assembly and the waterproof sleeve, effectively blocking the path through which moisture may enter from the mating gap between the claw and the end of the waterproof sleeve, further improving the sealing reliability of the mechanically driven double-margin sealed waterproof cable accessory end.

[0018] 3. A sealing ring A is provided between the nut and the end face of the first or second waterproof sleeve. When the nut is tightened, the sealing ring A will be squeezed and undergo elastic deformation, thereby fully filling the fitting gap between the nut and the end face of the first or second waterproof sleeve. Therefore, it can form an additional sealing barrier in the end connection area between the sleeve assembly and the waterproof sleeve, effectively blocking the path of moisture intrusion from the gap between the end face of the nut and the waterproof sleeve, and the thread gap between the screw tube and the nut. Attached Figure Description

[0019] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description 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 these drawings without creative effort. Figure 1 This is a schematic diagram illustrating the use of the present invention; Figure 2 This is a schematic diagram of the sleeve assembly in this invention.

[0020] Explanation of reference numerals in the attached drawings: 1. First waterproof sleeve, 2. Second waterproof sleeve, 3. Cable, 4. Screw, 5. Nut, 6. Claw, 601. Strip claw, 7. Rubber block, 8. Sealing gasket, 9. Sealing ring A, 10. Reinforcing sleeve, 11. Threaded sleeve, 12. Elastic clamping block, 13. Sealing ring B. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this patent.

[0022] Example 1 This invention discloses a mechanically driven, double-margin, sealed, waterproof cable accessory, such as... Figure 1As shown, it includes a clamping assembly installed at the connection of the cable 3, and a first waterproof sleeve 1 and a second waterproof sleeve 2 located outside the clamping assembly. The first waterproof sleeve 1 and the second waterproof sleeve 2 are both nested outside the cable 3, and one end of the first waterproof sleeve 1 is sealed to one end of the second waterproof sleeve 2. It also includes two sealing assemblies, both of which are nested around the outer periphery of the cable 3 and respectively seal the ends of the first waterproof sleeve 1 and the second waterproof sleeve 2 that are far apart from each other. Each sealing assembly includes a screw tube 4, which can be nested around the outer periphery of the cable 3 and passes through one end of the first waterproof sleeve 1 or the second waterproof sleeve 2. The outer periphery of the screw tube 4 is threaded with a nut 5. One end of the screw tube 4 is fixedly connected to a claw 6, which expands in a flared shape towards the end away from the screw tube 4. A rubber block 7 is embedded inside the claw 6, which can be nested around the outer periphery of the cable 3, and the outer periphery of the rubber block 7 is in contact with the inner wall of the claw 6.

[0023] In this embodiment, the connection of cable 3 needs to be insulated beforehand (e.g., wrapped with insulating tape), and the clamping assembly is used to fix the connection position of cable 3; both the first waterproof sleeve 1 and the second waterproof sleeve 2 are tubular structures with an inner diameter larger than the outer diameter of cable 3, and the two are sealed at the connection end; the screw tube 4 of the sleeve assembly is a hollow cylindrical structure with an inner diameter that matches the outer diameter of cable 3, and an external thread on the outer circumference that can precisely match the internal thread of nut 5. When the screw tube 4 passes through the end of the first waterproof sleeve 1 or the second waterproof sleeve 2, its outer wall fits against the inner wall of the through hole at the corresponding end of the first waterproof sleeve 1 or the second waterproof sleeve 2; the claw 6 is made of a metal material with a certain elasticity, and the rubber block 7 is an annular elastic rubber part with an inner diameter that matches the outer diameter of cable 3 and an outer diameter that matches the curvature of the inner wall of the claw 6. After installation, the inner ring of the rubber block 7 fits tightly against the outer circumference of cable 3, and the outer ring fits completely against the inner wall of the claw 6.

[0024] During actual installation, the components are first pre-fitted: the first waterproof sleeve 1 and the second waterproof sleeve 2 are respectively fitted onto the ends of the two sections of cable 3 to be connected; the two sealing assemblies (including the screw tube 4, nut 5, claw 6, and rubber block 7) are respectively fitted onto the ends of the two sections of cable 3 to be connected; the reinforcing sleeve 10 of the clamping assembly is fitted onto the end of one of the sections of cable 3 to be connected; the two elastic clamping blocks 12 and the two threaded sleeves 11 are respectively fitted onto the ends of the two sections of cable 3 to be connected, ensuring that each component is in the non-connection area of ​​the cable 3 ends and does not affect the subsequent cable connection. The second step is cable splicing: The ends of the two cables 3 to be connected are treated with core wire processing, such as stripping and crimping terminals. After precise splicing of the core wires, the connection point of the cables 3 is insulated, such as by wrapping with insulating tape. The third step is installing the clamping assembly: The reinforcing sleeve 10, pre-fitted onto the cable 3, is moved to the outside of the cable 3 connection point, aligning the central axis of the reinforcing sleeve 10 with the central axis of the cable 3. Then, the two elastic clamping blocks 12 are moved from both ends of the reinforcing sleeve 10 towards the center, so that the small end of the elastic clamping block 12 faces the inside of the reinforcing sleeve 10, and the conical surface of the elastic clamping block 12 is in contact with the conical surface of the inner wall of the reinforcing sleeve 10. Finally, the two threaded sleeves 11 are screwed onto both ends of the reinforcing sleeve 10, ensuring that the inner end face of the threaded sleeve 11 is in close contact with the large end of the elastic clamping block 12 during tightening. Step 4: Move the first waterproof sleeve 1 and the second waterproof sleeve 2 toward the connection of the cable 3 respectively, align their mating ends, and achieve a sealed connection through threaded engagement, forming an outer layer of protection for the connection of the clamping assembly and the cable 3; Step 5: Install and seal the sleeve assembly: Move the screw tube 4 of each sleeve assembly, adjust the position of the claw 6, and ensure that the rubber block 7 is tightly attached to the outer periphery of the cable 3; Finally, tighten the nuts 5 on the two sections of the cable 3 respectively. When the nuts 5 move toward the first waterproof sleeve 1 or the second waterproof sleeve 2 on the screw tube 4, they squeeze the corresponding end of the first waterproof sleeve 1 or the second waterproof sleeve 2 and drive the claw 6 to retract. The claw 6 squeezes the rubber block 7 inward to make it elastically deformed, further tightening it to the cable 3, achieving a seal between the end of the first waterproof sleeve 1 or the second waterproof sleeve 2 and the cable 3, completing the overall installation.

[0025] Furthermore, the sealing assembly also includes a sealing gasket 8, which surrounds the outer periphery of the claw 6 near the end of the screw tube 4. The sealing gasket 8 is made of rubber and has a ring-shaped structure. Its inner diameter matches the outer diameter of the claw 6 near the screw tube 4. During installation, the sealing gasket 8 is sandwiched between the claw 6 and the end of the first waterproof sleeve 1 or the second waterproof sleeve 2, with one side tightly against the end face of the claw 6 and the other side tightly against the corresponding end face of the first waterproof sleeve 1 or the second waterproof sleeve 2. The sealing gasket 8 effectively seals the gap between the claw 6 and the end of the first waterproof sleeve 1 or the second waterproof sleeve 2, preventing moisture from entering through the contact gap.

[0026] A sealing ring A9 is provided between the first waterproof sleeve 1 and the nut 5, and between the second waterproof sleeve 2 and the nut 5. The sealing ring A9 is fitted around the outer circumference of the screw tube 4. The sealing ring A9 is an annular seal made of silicone or rubber, and its inner diameter is the same as the outer diameter of the screw tube 4. During installation, the sealing ring A9 is first fitted onto the screw tube 4, located between the nut 5 and the end of the first waterproof sleeve 1 or the second waterproof sleeve 2. When the nut 5 is tightened, the nut 5 will compress the sealing ring A9, causing it to elastically deform and fill the gap between the nut 5 and the corresponding end of the first waterproof sleeve 1 or the second waterproof sleeve 2. The setting of the sealing ring A9 forms a second sealing barrier, which can not only seal the gap between the nut 5 and the end of the first waterproof sleeve 1 or the second waterproof sleeve 2, but also seal the gap between the outer circumference of the screw tube 4 and the inner wall of the nut 5, preventing moisture from entering from these parts.

[0027] like Figure 2 As shown, the clamping claw 6 includes multiple strip-shaped claws 601 arranged in a circumferential array. The multiple strip-shaped claws 601 are evenly distributed on the circumference, with gaps between adjacent claws 601 to facilitate the contraction and deformation of the clamping claw 6. Each claw 601 is made of spring steel, and the free end of the claw 601 (the end furthest from the solenoid 4) has a transition corner to prevent the rubber block 7 from detaching. The circumferential array design of the multiple claws 601 ensures that the clamping claw 6 applies uniform pressure to the outer circumference of the rubber block 7 when it contracts, ensuring balanced force and consistent deformation across all parts of the rubber block 7. The inner ring can tightly adhere to the outer circumference of the cable 3 from all directions, preventing localized sealing defects. The spring steel claws 601 have good elasticity.

[0028] The clamping assembly includes a reinforcing sleeve 10, two threaded sleeves 11, and two elastic clamping blocks 12 made of rubber. The outer wall of the reinforcing sleeve 10 is provided with external threads. The two threaded sleeves 11 are respectively threaded onto both ends of the reinforcing sleeve 10. The inner wall of the reinforcing sleeve 10 is a conical surface with a diameter that gradually decreases from the outside to the inside. The outer wall of the elastic clamping block 12 is also a conical surface and mates with the inner wall of the reinforcing sleeve 10. The larger end of the elastic clamping block 12 is located outside the reinforcing sleeve 10 and can contact the inner end face of the threaded sleeve 11. The reinforcing sleeve 10 is a metal tubular component with a length adapted to the length of the cable 3 connection point. The external thread precision of the outer wall is a common coarse thread. The internal threads of the threaded sleeves 11 are adapted to the external threads of the reinforcing sleeve 10. The conical surface taper of the elastic clamping block 12 is consistent with the taper of the inner wall of the reinforcing sleeve 10. The diameter of the large end is larger than the inner diameter of the end of the reinforcing sleeve 10, and the diameter of the small end is smaller than the inner diameter of the end of the reinforcing sleeve 10. The end face of the large end is flat and can achieve surface contact when it contacts the inner end face of the threaded sleeve 11.

[0029] When installing the clamping assembly, it should be done after the cable cores are connected and insulation treatment is completed: First, move the reinforcing sleeve 10, which is pre-fitted onto the cable 3, along the axial direction of the cable 3 until the reinforcing sleeve 10 completely covers the connection point of the cable 3, and the central axis of the reinforcing sleeve 10 coincides with the central axis of the cable 3, ensuring uniform wrapping and protection of the cable 3 connection point; then, move the two elastic clamping blocks 12 from both ends of the cable 3 toward the reinforcing sleeve 10, so that the small end of the elastic clamping block 12 extends into the interior of the reinforcing sleeve 10, and the conical surface of the elastic clamping block 12 is completely in contact with the conical surface of the inner wall of the reinforcing sleeve 10. At this time, the elastic clamping is complete. The large end of block 12 rests against the outer side of the end of the reinforcing sleeve 10. Finally, align the two threaded sleeves 11 with the external threads at both ends of the reinforcing sleeve 10, and rotate the threaded sleeves 11 clockwise. The threaded sleeves 11 move towards the middle of the reinforcing sleeve 10, and their inner end faces gradually press against the large end of the elastic clamping block 12, pushing the elastic clamping block 12 to slide inward along the conical surface of the inner wall of the reinforcing sleeve 10. The elastic clamping block 12 undergoes radial elastic deformation due to the pressure of the conical surface, and the inner ring tightly fits against the outer circumference of the cable 3 until the threaded sleeve 11 is tightened to the preset torque, thus completing the fixing of the cable 3 connection and preventing the cable 3 from loosening or shifting at the joint.

[0030] The aforementioned clamping assembly, through the threaded drive of the threaded sleeve 11 and the squeezing action of the conical surface, can control the clamping force of the elastic clamping block 12 on the cable 3, ensuring that the connection of the cable 3 is firmly fixed; the conical surface mating structure makes the force on the elastic clamping block 12 more uniform and the deformation more stable, while also playing a waterproof role.

[0031] The interior of the elastic clamping block 12 is a cylindrical cavity, and the end of the cavity near the larger end of the elastic clamping block 12 is chamfered. The chamfered design at the larger end makes it easier for the elastic clamping block 12 to fit onto the cable 3, avoiding scratches on the cable 3 sheath by the edge of the cavity during installation. At the same time, the chamfered surface can disperse the compressive stress and prevent the elastic clamping block 12 from cracking due to stress concentration during long-term use.

[0032] The first waterproof sleeve 1 and the second waterproof sleeve 2 are respectively provided with external and internal threads at their adjacent ends. The external thread of the first waterproof sleeve 1 mates with the internal thread of the second waterproof sleeve 2. A sealing ring B13 is provided between the end face of the first waterproof sleeve 1 and the second waterproof sleeve 2. The external thread of the mating end of the first waterproof sleeve 1 and the internal thread of the mating end of the second waterproof sleeve 2 are coarse threads of the same specification to ensure a firm connection. The sealing ring B13 is an annular seal made of fluororubber. During installation, the sealing ring B13 is placed in the groove on the end face of the mating end of the second waterproof sleeve 2. The groove size is adapted to the sealing ring B13. After the first waterproof sleeve 1 is screwed into the second waterproof sleeve 2, its end face presses against the sealing ring B13, so that the sealing ring B13 tightly fills the gap between the end faces of the two. The first waterproof sleeve 1 and the second waterproof sleeve 2 are connected by a threaded engagement, which not only facilitates installation and disassembly but also ensures the sealing and firmness of the connection, facilitating later maintenance. The sealing ring B13 effectively seals the gap between the end faces of the two, ensuring the sealing performance at the mating point of the first waterproof sleeve 1 and the second waterproof sleeve 2.

[0033] Example 2 This invention also discloses a construction method for a mechanically driven double-margin sealed waterproof cable accessory, which uses the mechanically driven double-margin sealed waterproof cable accessory as described in Example 1, and includes the following steps: Step 1: Insert the first waterproof sleeve 1, the second waterproof sleeve 2, the two sleeve sealing components, the reinforcing sleeve 10, the two elastic clamping blocks 12 and the two threaded sleeves 11 into the ends of the two sections of the cable 3 to be connected, respectively, and place each component in the non-connection area of ​​the cable 3. Step 2: Peel off the insulation layer at the ends of the two cable sections 3 and complete the core wire connection. Wrap the connection point of cable 3 with insulating tape for insulation protection. Step 3: Move the reinforcing sleeve 10 to completely cover the connection of the cable 3, insert the two elastic clamping blocks 12 from both ends of the reinforcing sleeve 10 respectively, so that the conical surface of the elastic clamping block 12 fits against the inner wall of the reinforcing sleeve 10, and then screw the two threaded sleeves 11 into both ends of the reinforcing sleeve 10 and tighten them, driving the elastic clamping blocks 12 to radially contract and fit tightly against the cable 3. Step 4: Move the first waterproof sleeve 1 and the second waterproof sleeve 2 to the outside of the connection point of the cable 3, and achieve docking through threaded engagement, and squeeze the sealing ring B13 to form a seal; Step 5: Adjust the position of the screw tube 4 of the sleeve assembly so that the sealing gasket 8 is clamped between the claw 6 and the corresponding waterproof sleeve end, and the sealing ring A9 is clamped between the nut 5 and the corresponding waterproof sleeve end face. Tighten the nut 5 to drive the claw 6 to contract, squeeze the rubber block 7 to deform elastically and stick tightly to the cable 3, and complete the overall seal.

[0034] Preferably, step 5 employs a graded sealing operation: first, tighten the nut 5 until the sealing gasket 8 adheres to the end of the waterproof sleeve, and hold for 20 to 30 seconds; then continue tightening until the strip claw 601 contracts uniformly, and the rubber block 7 initially adheres to the cable 3; finally, tighten to a preset torque of 8 to 12 N. m, ensure that there are no local gaps in the rubber block 7, and at the same time, the tightening torque of the threaded sleeve 11 in step 3 is 15 to 20 N. m, so that the radial shrinkage of the elastic clamping block 12 is 6% to 8% of its initial inner diameter.

[0035] In the description of this invention, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only to describe the invention and not to require the invention to be constructed or operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" in this invention should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms based on the specific circumstances.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in its embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A mechanically driven double-margin sealed waterproof cable accessory, comprising a clamping assembly installed at the connection of a cable (3), and a first waterproof sleeve (1) and a second waterproof sleeve (2) sleeved on the outside of the cable (3) and located outside the clamping assembly, wherein one end of the first waterproof sleeve (1) is sealed to one end of the second waterproof sleeve (2); Its features are, It also includes two sealing assemblies, which respectively seal the end of the first waterproof sleeve (1) away from the second waterproof sleeve (2) and the end of the second waterproof sleeve (2) away from the first waterproof sleeve (1), and are both fitted around the outer periphery of the cable (3); Each of the aforementioned sleeve components includes a screw tube (4), a nut (5), a claw (6), and a rubber block (7); the screw tube (4) is sleeved on the outer periphery of the cable (3), and one end passes through the end of the first waterproof sleeve (1) away from the second waterproof sleeve (2) or the end of the second waterproof sleeve (2) away from the first waterproof sleeve (1); the nut (5) is threadedly engaged with the outer periphery of the screw tube (4); the claw (6) is fixedly connected to the end of the screw tube (4) that extends out of the first waterproof sleeve (1) or the second waterproof sleeve (2), and expands in a funnel shape away from the screw tube (4); the rubber block (7) is embedded inside the claw (6) and sleeved on the outer periphery of the cable (3), and the outer periphery of the rubber block (7) is in contact with the inner wall of the claw (6).

2. The mechanically driven double-margin sealed waterproof cable accessory according to claim 1, characterized in that, The sealing assembly also includes a sealing gasket (8), which is sleeved on the outer periphery of the end of the claw (6) near the screw tube (4) and sandwiched between the claw (6) and the first waterproof sleeve (1) or the second waterproof sleeve (2).

3. The mechanically driven double-margin sealed waterproof cable accessory according to claim 2, characterized in that, It also includes a sealing ring A (9), which is sleeved on the outer periphery of the screw tube (4) and respectively sandwiched between the nut (5) and the end face of the first waterproof sleeve (1) or the second waterproof sleeve (2).

4. The mechanically driven double-margin sealed waterproof cable accessory according to claim 1, characterized in that, The claw (6) includes a plurality of strip claws (601) evenly distributed along the circumference, with a gap between two adjacent strip claws (601), and the strip claws (601) are made of elastic metal material.

5. The mechanically driven double-margin sealed waterproof cable accessory according to any one of claims 1 to 4, characterized in that, The clamping assembly includes a reinforcing sleeve (10), two threaded sleeves (11), and two elastic clamping blocks (12). The reinforcing sleeve (10) is fitted on the outside of the cable (3) connection, and its outer wall is provided with external threads, and its inner wall is a conical surface with a diameter that gradually decreases from the outside to the inside. The two threaded sleeves (11) are respectively threaded to the external threads at both ends of the reinforcing sleeve (10). The two elastic clamping blocks (12) are respectively fitted on the outer periphery of the cable (3) at both ends of the reinforcing sleeve (10), and their outer walls are conical surfaces that are adapted to the inner wall of the reinforcing sleeve (10). The large end of the elastic clamping block (12) is located outside the reinforcing sleeve (10) and abuts against the inner end face of the threaded sleeve (11).

6. The mechanically driven double-margin sealed waterproof cable accessory according to claim 5, characterized in that, The elastic clamping block (12) is made of rubber.

7. The mechanically driven double-margin sealed waterproof cable accessory according to claim 6, characterized in that, The elastic pressing block (12) has a cylindrical cavity inside, and the cavity has a chamfer at the opening near the large end of the elastic pressing block (12).

8. The mechanically driven double-margin sealed waterproof cable accessory according to claim 1, characterized in that, The first waterproof sleeve (1) has an external thread at one end near the second waterproof sleeve (2), and the second waterproof sleeve (2) has an internal thread at one end near the first waterproof sleeve (1). The external thread of the first waterproof sleeve (1) and the internal thread of the second waterproof sleeve (2) are threaded together. A sealing ring B (13) is provided between the end face of the first waterproof sleeve (1) near the second waterproof sleeve (2) and the second waterproof sleeve (2).

9. A construction method for a mechanically driven double-margin sealed waterproof cable accessory, characterized in that, The mechanically driven double-margin sealed waterproof cable accessory as described in any one of claims 1 to 8 includes the following steps: Step 1: Insert the first waterproof sleeve (1), the second waterproof sleeve (2), the two sleeve sealing components, the reinforcing sleeve (10), the two elastic clamping blocks (12) and the two threaded sleeves (11) into the ends of the two sections of the cable (3) to be connected, respectively, and place each component in the non-connection area of ​​the cable (3); Step 2: Strip the insulation layer from the ends of the two cable sections (3) and complete the core wire connection. Wrap the connection of the cable (3) with insulating tape for insulation protection. Step 3: Move the reinforcing sleeve (10) to completely cover the connection of the cable (3), insert the two elastic clamping blocks (12) from both ends of the reinforcing sleeve (10) respectively, so that the conical surface of the elastic clamping block (12) fits against the inner wall of the reinforcing sleeve (10), and then screw the two threaded sleeves (11) into both ends of the reinforcing sleeve (10) and tighten them, driving the elastic clamping block (12) to radially contract and fit tightly against the cable (3). Step 4: Move the first waterproof sleeve (1) and the second waterproof sleeve (2) to the outside of the cable (3) connection point, and achieve docking through threaded connection, and squeeze the sealing ring B (13) to form a seal; Step 5: Adjust the position of the screw tube (4) of the sleeve assembly so that the sealing gasket (8) is clamped between the claw (6) and the corresponding waterproof sleeve end, and the sealing ring A (9) is clamped between the nut (5) and the corresponding waterproof sleeve end face. Tighten the nut (5) to drive the claw (6) to contract, squeeze the rubber block (7) to elastically deform and stick tightly to the cable (3), and complete the overall seal.

10. The construction method of the mechanically driven double-margin sealed waterproof cable accessory according to claim 9, characterized in that, Step 5 employs a graded sealing operation: First, tighten the nut (5) until the sealing gasket (8) fits against the end of the waterproof sleeve, and hold for 20 to 30 seconds; then continue tightening until the strip claw (601) contracts evenly, and the rubber block (7) initially fits against the cable (3); finally, tighten to the preset torque of 8 to 12 N. m, ensure that there are no local gaps in the rubber block (7), and at the same time, the tightening torque of the threaded sleeve (11) in step 3 is 15 to 20 N. m, so that the radial shrinkage of the elastic clamping block (12) is 6% to 8% of its initial inner diameter.

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