A connecting joint for a cable terminal

Abstract

The present invention relates to the field of cable cold shrink terminal installation, and specifically to a connection joint for a cable terminal, comprising a guide block and a drive structure, wherein a coating unit is provided on the guide block. When the drive structure drives the spiral support bar to move inside the cold shrink tube and drives the guide block to move inside the cold shrink tube, the coating unit will evenly coat the coating on the inner wall of the cold shrink tube during the movement of the guide block. Thus, the coating unit follows the movement of the guide block to coat the coating on the inner wall of the cold shrink tube, ensuring that the coating coverage area is complete and continuous, thereby improving the uniformity and stability of the coating application, enhancing the sealing performance and insulation reliability between the cold shrink tube and the cable, and extending the service life of the cable system.

Description

Technical Field

[0001] The invention relates to the field of cable cold shrink terminal installation, in particular to a connecting joint for a cable terminal. Background Art

[0002] Cold-shrink cable terminals are key components used for insulation, sealing, and protection of cable terminals in power systems. They can be installed without heating, relying on the elasticity of the material. They consist of cold-shrink tubing and spiral support strips. The tubing is made of silicone rubber or EPDM, often in a multi-layer composite structure, and is pre-expanded before leaving the factory. The spiral support strips are made of hard plastic and are in a continuous spiral shape. During factory production, the spiral support strips are embedded into the inner wall of the cold-shrink tubing to support it and maintain its expanded state, making it easier to insert into the cable. For use, the cable is pre-treated by stripping and cleaning. Silicone grease is applied to the sleeve area of ​​the cold-shrink tubing on the cable to enhance sealing and lubricity. The pre-expanded terminal head is then inserted into the cable's preset position. The spiral support strips are then removed, gradually releasing their support for the cold-shrink tubing, allowing the tubing to shrink and fit the cable. Finally, the shielding layer connection and accessory installation are completed.

[0003] However, in the existing technology, when operators apply silicone grease on the surface of the cold shrink tube sleeve, they usually rely on manual experience and lack a unified quantitative standard. In addition, it is difficult to accurately control the amount of silicone grease using common tools such as brushes and rags, which leads to problems such as uneven thickness of the silicone grease and inaccurate application range. Summary of the Invention

[0004] Based on this, it is necessary to provide a connection joint for a cable terminal to address the problem of uneven silicone grease coating on the connection joint of the current cable terminal.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A connecting joint for a cable terminal, comprising:

[0007] A cold shrink tube is used to cover the insulation layer of a cable.

[0008] A spiral support bar is coaxially arranged inside the cold shrink tube, and the spiral support bar can support the cold shrink tube.

[0009] A guide block is coaxially arranged inside the cold shrink tube, one end of the guide block abuts against one end of the spiral support bar, and the guide block can move inside the cold shrink tube; a coating unit is provided on the guide block, and the coating unit applies coating on the inner wall of the cold shrink tube during the movement of the guide block inside the cold shrink tube.

[0010] A driving structure, wherein the driving structure can drive the spiral support bar to slide on the inner wall of the cold shrink tube, and the driving structure can also drive the guide block to move inside the cold shrink tube when the spiral support bar slides inside the cold shrink tube.

[0011] Furthermore, the paint unit includes a storage cavity, which is deformably fixedly arranged inside the guide block, and the volume of the storage cavity is positively correlated with the amount of paint in the storage cavity; the storage cavity is provided with a discharge port, and the paint can flow out through the discharge port when the guide block moves inside the shrink tube and be coated on the inner wall of the shrink tube.

[0012] Furthermore, the storage cavity is capable of elastic deformation, and an outer wall of the storage cavity is capable of contacting the external environment.

[0013] Furthermore, the driving structure includes a driving rope, one end of which is fixedly connected to the guide block, and the other end of which extends out of the shrink tube. By pulling the driving rope, the guide block can be moved along the axis inside the shrink tube.

[0014] Furthermore, the guide block is also fixedly provided with a storage block, which is fixedly connected to one end of the guide block abutting against the spiral support bar, and the storage block is arranged inside the spiral support bar; the drive rope is coaxially fixed on the storage block.

[0015] The storage block is provided with a connecting channel and a stripping block, the connecting channel is fixedly provided at one end of the storage block close to the guide block, and the connecting channel passes through the storage block; the stripping block is fixedly provided at the connecting channel on the outer wall of the storage block, the stripping block can separate the spiral support bar and the cold shrink tube, and the stripping block can guide the spiral support bar into the connecting channel.

[0016] Furthermore, a storage groove is fixedly provided on the storage block, and the storage groove is used to store part of the spiral support bar separated from the cold shrink tube; the connecting channel connects the outer wall of the storage block and the storage groove, so that the spiral support bar can enter the storage groove through the connecting channel.

[0017] Furthermore, the stripping blocks and the spiral support bars are each provided in three numbers, the three stripping blocks are evenly distributed along the circumferential direction on the outer wall of the receiving block, and the three spiral support bars respectively enter the receiving groove through one of the connecting channels.

[0018] Furthermore, the stripping block is configured as a scraper, the blade of the scraper can cut into the gap between the spiral support bar and the shrink tube, and the inner wall of the scraper can guide the spiral support bar into the connecting channel.

[0019] Furthermore, a plurality of elastic members are provided on the inner wall of the storage block, and the plurality of elastic members can abut against the insulation layer of the cable to achieve coaxiality between the cold shrink tube and the cable.

[0020] Furthermore, the guide block extends a tapered block toward the outside of the cold shrink tube, and the tapered block is used to guide the cold shrink tube to retract and cover the cable insulation layer at a stable rate.

[0021] The beneficial effects of the present invention are:

[0022] The present invention provides a connecting joint for a cable terminal, comprising a guide block and a drive structure, wherein a coating unit is provided on the guide block. When the drive structure drives the spiral support bar to move within the cold shrink tube and drives the guide block to move within the cold shrink tube, the coating unit will evenly apply the coating to the inner wall of the cold shrink tube during the movement of the guide block. Thus, the coating unit follows the movement of the guide block to apply the coating to the inner wall of the cold shrink tube, ensuring that the coating coverage area is complete and continuous, improving the uniformity and stability of the coating, enhancing the sealing performance and insulation reliability of the cold shrink cable terminal head, and extending the service life of the cable system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 for Figure 1 Front view of .

[0025] Figure 3 for Figure 2 Cross-sectional view in the AA direction.

[0026] Figure 4 for Figure 2 Cross-sectional view in the BB direction.

[0027] Figure 5 for Figure 3 A partial enlarged view of point C in the middle.

[0028] Figure 6 for Figure 3 A partial enlarged view of point D in the middle.

[0029] Figure 7 for Figure 4 A partial enlarged view of point E in the middle.

[0030] Figure 8 Schematic diagram of the structure of the spiral support bar in the present invention.

[0031] Figure 9 Schematic diagram of the structure of the driving rope in the present invention.

[0032] Figure 10 It is a schematic structural diagram of the guide block, receiving block, elastic member and tapered block in the present invention.

[0033] in:

[0034] 110. Cable;

[0035] 210. Shrink tube; 220. Spiral support bar; 230. Guide block; 240. Drive structure; 241. Drive rope; 250. Storage cavity; 251. Discharge port; 260. Storage block; 261. Storage slot; 262. Connecting channel; 263. Stripping block; 270. Elastic member; 280. Conical block. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] Refer to the following Figures 1 to 10 The connection joint of the cable terminal provided by the embodiment of the present invention is described.

[0038] Specifically, the connecting joint of the cable terminal includes a cold shrink tube 210 , a spiral support bar 220 , a guide block 230 and a driving structure 240 .

[0039] The cold shrink tube 210 is usually made of silicone rubber or ethylene propylene rubber and has a pre-expanded multi-layer composite structure. The cold shrink tube 210 is used to achieve insulation recovery, sealing protection, stress buffering and adaptation to thermal expansion and contraction at the terminal of the cable 110.

[0040] The spiral support bar 220 is coaxially disposed within the cold shrink tube 210 and is pre-assembled with the cold shrink tube 210. The spiral support bar 220 supports the cold shrink tube 210, keeping it expanded to facilitate inserting the connector into the cable 110. When the spiral support bar 220 is separated from the inner wall of the cold shrink tube 210, it no longer supports the cold shrink tube 210, allowing the cold shrink tube 210 to shrink and wrap around the cable 110.

[0041] The guide block 230 is coaxially arranged inside the cold shrink tube 210, wherein one end of the guide block 230 is aligned with the edge of the cold shrink tube 210, the other end of the guide block 230 is always in contact with the spiral support bar 220, and the guide block 230 can move inside the cold shrink tube 210.

[0042] A paint unit is provided on the guide block 230. The paint unit includes a storage cavity 250, which is fixedly provided inside the guide block 230. The storage cavity 250 is filled with paint for enhancing sealing and lubricity. The storage cavity 250 is a closed structure with a certain elasticity, which can deform as the amount of paint inside changes. Part of the outer wall surface of the storage cavity 250 can contact the external environment between the cold shrink tube 210 and the cable 110. A plurality of discharge ports 251 are provided on the storage cavity 250, and the plurality of discharge ports 251 are evenly distributed on the side of the storage cavity 250 facing the inner wall of the cold shrink tube 210, providing a channel for the paint to flow out, ensuring that the paint can be evenly coated on the inner wall of the cold shrink tube 210.

[0043] The drive mechanism 240 includes a drive cord 241. One end of the drive cord 241 is fixedly connected to the guide block 230, and the other end extends through the interior of the spiral support bar 220 and out of the shrink tube 210, providing a point of external force for the operator. When the operator removes the spiral support bar 220 and pulls the drive cord 241, the guide block 230 moves within the shrink tube 210 as the spiral support bar 220 is released, ensuring smooth shrinkage of the shrink tube 210.

[0044] When the guide block 230 moves within the cold shrink tube 210, and before the cold shrink tube 210 is wrapped around the cable 110, the paint storage cavity 250, due to its inherent elasticity, continuously squeezes the paint within, causing it to constantly flow out. Simultaneously, the cold shrink tube 210 is in an expanded state and has a tendency to contract, with the inner wall of the cold shrink tube 210 pressing tightly against the discharge port 251 of the storage cavity 250. At this point, the paint is trapped between the inner wall of the cold shrink tube 210 and the storage cavity 250, preventing it from overflowing.

[0045] As the storage chamber 250 moves within the shrink tube 210 along with the guide block 230, the storage chamber 250 carries the paint inside with it. The inner wall of the shrink tube 210, which was not previously exposed to the paint, moves to the discharge port 251 of the storage chamber 250. The elastic compression of the storage chamber 250 causes the paint to flow out of the discharge port 251 of the storage chamber 250 and cover the unexposed areas of the shrink tube 210. As the guide block 230 continues to move within the shrink tube 210, the paint inside the storage chamber 250 continues to flow out through the discharge port 251, evenly coating the inner wall of the shrink tube 210. At the same time, as the paint is gradually released, the pressure inside the storage chamber 250 decreases. The pressure of the external environment further forces the storage chamber 250 to contract, gradually reducing its volume until the paint is exhausted.

[0046] During use, the operator pulls out the spiral support bar 220 to release its support for the cold shrink tube 210, and pulls the drive rope 241 to move the guide block 230 synchronously. At this time, the paint in the storage cavity 250 is released through the discharge port 251, and the paint evenly covers the inner wall of the cold shrink tube 210 during the movement of the guide block 230. As the paint continues to flow out, the storage cavity 250 continues to shrink. After the guide block 230 is pulled out of the cold shrink tube 210, the storage cavity 250 is pulled out of the cold shrink tube 210 together with the guide block 230. After losing its support, the cold shrink tube 210 shrinks tightly, and its inner wall has been evenly covered with paint, ensuring a close fit with the surface of the cable 110.

[0047] Therefore, by setting a storage cavity 250 on the guide block 230, the paint can be evenly applied to the inner wall of the cold shrink tube 210, thereby improving the sealing and insulation performance of the cold shrink tube 210 after shrinkage, reducing the risk of local discharge or insulation failure caused by uneven distribution of paint, and at the same time simplifying the installation process and improving construction efficiency.

[0048] It is understood that the portion of the drive rope 241 used to pull the guide block 230 can be a flexible drive rod or a steel wire rope. These structures can be directly integrally formed with the guide block 230 or detachably fixed to the guide block 230 via connectors such as buckles and bolts. However, these structures should be able to stably drive the guide block 230 to move within the cold shrink tube 210 when the spiral support bar 220 slides within the cold shrink tube 210.

[0049] In other embodiments where the storage cavity 250 is completely located inside the guide block 230, the storage cavity 250 may also be made of materials such as elastic rubber, which can deform through the elasticity or flexibility of its own material, thereby squeezing the internal coating to ensure that the coating can continue to flow out through the discharge port 251 and be coated on the inner wall of the cold shrink tube 210, thereby meeting the coating requirements of the connecting joint during use.

[0050] In one embodiment, a receiving block 260 is fixedly mounted on the guide block 230. The receiving block 260 is fixedly connected to one end of the guide block 230 that abuts against the spiral support bar 220 and is disposed inside the spiral support bar 220. The drive rope 241 is coaxially fixedly mounted on the receiving block 260.

[0051] The receiving block 260 is provided with a connecting channel 262 and a stripping block 263 .

[0052] One end of the connecting channel 262 opens on the side wall of the storage block 260 facing the spiral support bar 220, and the other end opens on the inner wall of the storage block 260. The aperture of the connecting channel 262 allows the spiral support bar 220 to pass smoothly through the connecting channel 262. The extension path of the connecting channel 262 is configured as a curved path, which is compatible with the helical angle and pitch of the spiral support bar 220 to prevent the spiral support bar 220 from getting stuck during the removal process and ensure that the spiral support bar 220 can pass through the storage block 260 stably. During the pre-assembly stage, the spiral support bar 220 is partially inserted into the connecting channel 262.

[0053] One end of the stripping block 263 is fixed to the connecting channel 262 on the outer wall of the storage block 260. The other end of the stripping block 263 is acutely angled. When the storage block 260 moves with the guide block 230, the acute angle of the stripping block 263 smoothly fits into the gap between the spiral support bar 220 and the shrink tube 210, separating them. The inner wall of the stripping block 263 fits snugly against the spiral support bar 220, allowing the spiral support bar 220 to move along the inner wall of the stripping block 263 during removal, enter the connecting channel 262, and pass through the storage block 260.

[0054] During the use of the connecting connector of the cable terminal, part of the spiral support bar 220 has been passed through the connecting channel 262 in the pre-assembly stage, and the sharp angle structure of the stripping block 263 on the storage block 260 is aligned with the gap between the spiral support bar 220 and the cold shrink tube 210.

[0055] When the operator pulls the drive cord 241, it drives the storage block 260 away from the end of the cable 110. At this point, the sharp-angled structure of the stripping block 263, driven by the storage block 260, smoothly inserts into the gap between the spiral support bar 220 and the shrink tube 210. As the storage block 260 continues to move, the stripping block 263 uses its sharp-angled structure to gradually separate the spiral support bar 220 from the shrink tube 210, separating them from their tightly fitted state. Guided by the inner wall of the stripping block 263, the separated spiral support bar 220 passes through the connecting channel 262. Simultaneously, due to the spiral structure of the spiral support bar 220, the combined action of the stripping block 263 and the guiding action of the connecting channel 262 allows the storage block 260 to adaptively rotate within the shrink tube 210, ensuring that the spiral support bar 220 can be continuously and smoothly removed from the shrink tube 210.

[0056] The stripping block 263 is inserted into the gap between the spiral support bar 220 and the shrink tube 210 through an acute-angle structure, and uses the movement of the storage block 260 to form a stable separation force, gradually stretching the fitted spiral support bar 220 and the shrink tube 210, avoiding uneven force in manual operation. The precise guidance of the connecting channel 262 can ensure that the spiral support bar 220 moves along a fixed path, preventing jamming caused by offset. As a result, the extraction process of the spiral support bar 220 is smoother and more stable, and the shrink tube 210 can shrink evenly after the spiral support bar 220 is completely extracted, avoiding wrinkles or bubbles caused by local premature shrinkage.

[0057] Furthermore, in the prior art, the spiral support bar 220 that has been separated from the cold shrink tube 210 is prone to swinging freely inside the cold shrink tube 210 due to the loss of restraint, which may cause friction with the inner wall of the cold shrink tube 210 and cause wear of the tube wall, or may re-attach to the cold shrink tube 210 due to the large swing amplitude, increasing the withdrawal resistance.

[0058] Based on this, a storage groove 261 is further provided on the storage block 260 .

[0059] The receiving groove 261 is an arc-shaped groove extending axially along the receiving block 260 and capable of accommodating a portion of the spiral support bar 220 that has been separated from the cold shrink tube 210. The connection relationship of the connecting channel 262 in the previous embodiment has been modified: one end of the connecting channel 262 is connected to the outer wall of the receiving block 260, and the other end is connected to the interior of the receiving groove 261, allowing the spiral support bar 220 to smoothly enter the receiving groove 261 through the connecting channel 262.

[0060] During the use of the connector, the stripping block 263 separates the spiral support bar 220 from the cold shrink tube 210. The separated spiral support bar 220, guided by the connecting channel 262, moves along the connecting channel 262 toward the storage groove 261. As the drive pull cord 241 continues to pull the storage block 260 away from the terminal of the cable 110, more and more spiral support bars 220 separated from the cold shrink tube 210 enter the storage groove 261 through the connecting channel 262 and stack in an orderly manner according to their own spiral shape within the storage groove 261. When the entire spiral support bar 220 is completely separated from the cold shrink tube 210 and is completely pulled out of the cold shrink tube 210 by the drive pull cord 241 along with the storage block 260, the extraction operation is completed.

[0061] Thus, the detached spiral support bar 220 is constrained by the provision of the receiving groove 261, preventing it from swinging freely, thereby avoiding unnecessary friction and collision with other components. This makes the removal process of the spiral support bar 220 smoother and more efficient, reduces the risk of jamming, and protects the inner wall of the cold shrink tube 210 and other structures from wear.

[0062] Furthermore, there are three stripping blocks 263 and three spiral support bars 220. The three stripping blocks 263 are evenly distributed along the circumference of the outer wall of the storage block 260, with the acute angle of each stripping block 263 corresponding to the gap between the spiral support bar 220 and the shrink tube 210. Simultaneously, the three spiral support bars 220 each enter the storage groove 261 through a connecting channel 262, corresponding one-to-one with the three stripping blocks 263, forming a mating relationship.

[0063] The three stripping blocks 263 simultaneously separate the three spiral support strips 220 from three symmetrical locations on the inner wall of the cold shrink tube 210, ensuring balanced force on the circumference of the cold shrink tube 210. Three connecting channels 262 are also evenly distributed along the circumference of the storage block 260, corresponding to the positions of the three stripping blocks 263. One end of each connecting channel 262 connects to the outer wall of the storage block 260 where the corresponding stripping block 263 is located, and the other end leads to the storage groove 261, providing an independent passage for the corresponding spiral support strip 220.

[0064] During the pre-assembly stage of the connection joint of the cable terminal, the three spiral support bars 220 are spirally wound and stacked inside the receiving groove 261 in advance.

[0065] During use, when the operator pulls the drive cord 241 to move the storage block 260, the three stripping blocks 263 simultaneously insert into the gaps between the three spiral support bars 220 and the shrink tube 210. Because the stripping blocks 263 are evenly distributed along the circumference, the separating force on the inner wall of the shrink tube 210 remains balanced. Subsequently, driven by the separating action of the corresponding stripping blocks 263 and the guidance of the connecting channels 262, the three spiral support bars 220 each pass through a connecting channel 262 into the storage slot 261, stacking in an orderly manner along the circumferential space of the storage slot 261.

[0066] Thus, through the coordination of the three stripping blocks 263 and the three spiral support bars 220, and the uniform distribution of force points around the circumference, the inner wall of the cold shrink tube 210 is evenly stressed during the separation process, avoiding localized bias. Furthermore, the three stripping blocks 263 can simultaneously strip the three spiral support bars 220, accelerating the removal process and improving construction efficiency.

[0067] Furthermore, the stripping block 263 is configured as a scraper, the blade of which can cut into the gap between the spiral support bar 220 and the shrink tube 210, and the inner wall of the scraper can guide the spiral support bar 220 through the connecting channel 262 and into the receiving groove 261. The thinner and sharper blade of the scraper can more easily cut into the tiny gap between the spiral support bar 220 and the shrink tube 210 that may be formed due to over-tight fit.

[0068] It is understood that the portion of the stripping block 263 used to separate the spiral support bar 220 from the shrink tube 210 can be a wedge-shaped block, or can also have a conical head, arc-shaped blade, or other structures. These structures can be integrally formed on the outer wall of the storage block 260, or can be fixed to the outer wall of the storage block 260 by welding or other means. However, these structures should be able to smoothly insert into the gap between the spiral support bar 220 and the shrink tube 210 and guide the spiral support bar 220 through the connecting channel 262 and into the storage groove 261.

[0069] In one embodiment, in a conventional installation, if the cold shrink tube 210 and the cable 110 are not coaxial, the cold shrink tube 210 may be partially too loose or too tight after shrinkage, causing insulation degradation or mechanical damage.

[0070] To this end, multiple elastic members 270 are fixedly mounted on the inner wall of the receiving block 260. These members 270 protrude from the inner wall of the receiving block 260 to form elastic contact points capable of contacting the insulation layer of the cable 110. The elastic members 270, through their elastic deformation, generate radial pressure when in contact with the insulation layer of the cable 110, stabilizing the receiving block 260, the guide block 230 connected thereto, and the cold shrink tube 210 in a coaxial position with the cable 110, thereby achieving radial positioning of the cold shrink tube 210.

[0071] During use, when the connector is inserted into the cable 110, the receiving block 260 and the guide block 230 are inserted into the exterior of the cable 110. At this point, the elastic members 270 on the inner wall of the receiving block 260 first come into contact with the insulation layer of the cable 110. The multiple elastic members 270 are elastically deformed by the compression of the insulation layer of the cable 110, generating an outward reaction force. This reaction force acts on the insulation layer of the cable 110, keeping the receiving block 260 coaxial with the cable 110.

[0072] As the storage block 260 moves under the traction of the driving rope 241, the elastic member 270 ensures that the storage block 260 always remains coaxial with the cable 110, and then drives the cold shrink tube 210 to maintain a coaxial state with the cable 110 through the guide block 230.

[0073] Therefore, by setting up multiple elastic parts 270, the radial pressure generated by the elastic deformation of the elastic parts 270 is continuously pressed against the insulation layer of the cable 110, ensuring that the cold shrink tube 210 always remains coaxial with the cable 110 before shrinking, avoiding uneven shrinkage due to positioning deviation, and allowing the cold shrink tube 210 to evenly fit the surface of the cable 110 after shrinking, reducing local gaps or wrinkles, thereby improving the overall sealing performance and insulation reliability, and reducing the risk of discharge or short circuit caused by poor fitting.

[0074] It can be understood that the elastic member 270 used to contact the insulation layer of the cable 110 and generate radial pressure can be a spring, or a coil spring, rubber boss or other structure, but these structures should be able to undergo elastic deformation when in contact with the insulation layer of the cable 110, generating a continuous radial force to stabilize the storage block 260 in a coaxial position with the cable 110.

[0075] In one embodiment, in the prior art, after the cold shrink tube 210 loses the support of the spiral support bar 220, due to its own uneven elastic distribution or sudden change in local force, some areas will shrink rapidly and some areas will lag behind, resulting in uneven problems such as wrinkles and gaps when sleeved.

[0076] Based on this, a conical block 280 coaxially extends from one end of the guide block 230 toward the outside of the cold shrink tube 210. The conical block 280 is generally conical in shape, with its large diameter end fixedly connected to the end face of the guide block 230 and its small diameter end facing the terminal direction of the cable 110, forming a conical structure with a diameter gradually narrowing from the guide block 230 toward the cable 110, and the outer wall of the conical block 280 is smooth.

[0077] When the operator pulls the drive cord 241, the receiving block 260 drives the tapered block 280, along with the guide block 230, away from the terminal end of the cable 110. The tapered surface of the tapered block 280 slides against the inner wall of the cold shrink tube 210, guiding the tube 210 to gradually contract as the spiral support bar 220 is withdrawn. The tapered structure's gradually changing diameter provides a smooth contraction transition path for the cold shrink tube 210.

[0078] During use, as the spiral support strip 220 is separated by the stripping block 263 and enters the storage groove 261 through the connecting channel 262, the cold shrink tube 210 gradually loses support and begins to shrink inward. At the same time, the guide block 230 drives the conical block 280 to move inside the cold shrink tube 210, and the inner wall of the cold shrink tube 210 slides along the surface of the conical block 280. Since the conical block 280 gradually narrows from the large diameter end to the small diameter end, the cold shrink tube 210 will first contact the large diameter end of the conical block 280 during the shrinkage process. As the conical block 280 moves, the inner wall of the cold shrink tube 210 gradually slides along the conical surface toward the small diameter end, and the shrinkage amplitude gradually increases, and finally smoothly covers the surface of the cable 110, completing the shrinkage process.

[0079] Therefore, by providing the tapered block 280 , the cold shrink tube 210 can shrink evenly and smoothly and tightly wrap around the cable 110 , thereby avoiding local mutations, reducing defects such as wrinkles and bubbles, and improving insulation and sealing performance.

Claims

1. A connecting joint for a cable terminal, characterized in that: include: A cold shrink tube (210), the cold shrink tube (210) being used to cover an insulation layer of a cable (110); a spiral support bar (220), the spiral support bar (220) being coaxially arranged inside the cold shrink tube (210), and the spiral support bar (220) being capable of supporting the cold shrink tube (210); A guide block (230), the guide block (230) being coaxially arranged inside the cold shrink tube (210), one end of the guide block (230) being in contact with one end of the spiral support bar (220), and the guide block (230) being capable of moving inside the cold shrink tube (210); a coating unit being provided on the guide block (230), and coating the inner wall of the cold shrink tube (210) with coating during the movement of the guide block (230) inside the cold shrink tube (210); a driving structure (240), wherein the driving structure (240) is capable of driving the spiral support bar (220) to slide inside the cold shrink tube (210), and the driving structure (240) is further capable of driving the guide block (230) to move inside the cold shrink tube (210) when the spiral support bar (220) slides inside the cold shrink tube (210); The coating unit comprises a storage cavity (250), the storage cavity (250) being fixedly arranged inside the guide block (230) in a deformable manner, and the volume of the storage cavity (250) being positively correlated with the amount of coating in the storage cavity (250); the storage cavity (250) being provided with a discharge port (251), and the coating can flow out through the discharge port (251) when the guide block (230) moves inside the shrink tube (210), and be coated on the inner wall of the shrink tube (210).

2. A cable terminal connection joint according to claim 1, characterized in that: The storage cavity (250) is capable of elastic deformation, and an outer wall of the storage cavity (250) is capable of contacting the external environment.

3. The connecting joint of a cable terminal according to claim 1, characterized in that: The driving structure (240) includes a driving rope (241), one end of which is fixedly connected to the guide block (230), and the other end of which extends out of the shrink tube (210). By pulling the driving rope (241), the guide block (230) can be moved along the axis inside the shrink tube (210).

4. A connecting joint for a cable terminal according to claim 3, characterized in that: The guide block (230) is further fixedly provided with a receiving block (260), the receiving block (260) being fixedly connected to one end of the guide block (230) abutting against the spiral support bar (220), and the receiving block (260) being arranged inside the spiral support bar (220); the driving pull rope (241) is coaxially fixedly arranged on the receiving block (260); The receiving block (260) is provided with a connecting channel (262) and a stripping block (263), wherein the connecting channel (262) is fixedly provided at one end of the receiving block (260) close to the guide block (230), and the connecting channel (262) passes through the receiving block (260); the stripping block (263) is fixedly provided at the connecting channel (262) on the outer wall of the receiving block (260), and the stripping block (263) can separate the spiral support bar (220) and the shrink tube (210), and the stripping block (263) can guide the spiral support bar (220) into the connecting channel (262).

5. A connecting joint for a cable terminal according to claim 4, characterized in that: A receiving groove (261) is also fixedly provided on the receiving block (260), and the receiving groove (261) is used to receive a portion of the spiral support bar (220) separated from the cold shrink tube (210); the connecting channel (262) connects the outer wall of the receiving block (260) and the receiving groove (261), so that the spiral support bar (220) can enter the receiving groove (261) through the connecting channel (262).

6. A connecting joint for a cable terminal according to claim 5, characterized in that: The stripping blocks (263) and the spiral support bars (220) are each provided in three numbers. The three stripping blocks (263) are evenly distributed along the circumference on the outer wall of the receiving block (260). The three spiral support bars (220) respectively enter the receiving groove (261) through one of the connecting channels (262).

7. The connecting joint of a cable terminal according to claim 5, characterized in that: The stripping block (263) is configured as a scraper, the blade of which can cut into the gap between the spiral support bar (220) and the shrink tube (210), and the inner wall of the scraper can guide the spiral support bar (220) into the connecting channel (262).

8. The connecting joint of a cable terminal according to claim 4, characterized in that: The inner wall of the storage block (260) is provided with a plurality of elastic members (270), and the plurality of elastic members (270) can abut against the insulation layer of the cable (110) to achieve coaxiality between the cold shrink tube (210) and the cable (110).

9. The connecting joint of a cable terminal according to claim 1, characterized in that: The guide block (230) extends a tapered block (280) toward the outside of the cold shrink tube (210), and the tapered block (280) is used to guide the cold shrink tube (210) to retract the insulation layer of the cable (110) at a stable rate.

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