Rapid installation device and method for intermediate joint of cold shrink type cable

Abstract

The invention relates to the technical field of cold contraction cable installation, in particular to a quick installation device and method for a cold contraction type cable intermediate joint. A rapid installation device for a cold contraction type cable intermediate joint comprises an installation ring and guide frames, the guide frames are slidably connected in a ring body of the installation ring in the radial direction through connecting rods, the guide frames are circumferentially distributed in the installation ring, and guide claws are arranged on the inner sides of the guide frames; the expansion rods are slidably mounted on the guide claws of the guide frame, the expansion rods are used for circumferentially expanding the cold shrink tube, and a rotating ring is rotatably connected in the mounting ring. Through the synergistic effect of the mounting ring, the rotating ring, the guide frame, the expansion rod and other assemblies, automatic expansion, contraction and extraction of the cold contraction pipe are achieved, and the situation that in a traditional cold contraction pipe, a spiral supporting strip is preset for a long time to be in a high-tension state for a long time, and consequently elasticity attenuation is caused is avoided; therefore, the installation quality and efficiency of the cable intermediate joint in the construction site are obviously improved.

Description

Technical Field

[0001] This invention relates to the field of cold-shrink cable installation technology, specifically to a quick installation device and method for cold-shrink cable intermediate joints. Background Technology

[0002] Cold-shrink cable joints, as an advanced cable connection technology, are widely used in the connection and termination of power and communication cables. Their core technology relies on elastomer materials such as silicone rubber or EPDM rubber. These materials are pre-expanded in the factory and embedded with plastic spiral supports to maintain their shape. This design allows for installation without heating; simply removing the internal supports allows the cold-shrink tubing to tightly wrap around the cable using its own elastic resilience, providing excellent waterproof sealing and insulation protection. Due to their simple operation and reliable performance, cold-shrink cable joints have become an important component in modern cable laying projects.

[0003] However, traditional cold-shrink cable joint technology has certain limitations. Due to the pre-installed spiral support strip, the cold-shrink sleeve is under high tension for extended periods, leading to material elasticity degradation and weakened sealing. Furthermore, this method limits the product's shelf life, as stress relaxation over time increases the risk of permanent deformation. More importantly, manually removing the support strip during installation makes uniform shrinkage difficult, potentially reducing the joint's seal and stability and affecting the overall quality of the cable connection. Therefore, to overcome these problems and improve installation efficiency and reliability, a rapid installation device and method for cold-shrink cable joints are designed. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a quick installation device and method for a cold-shrink cable joint.

[0005] The technical solution is as follows: A quick installation device for a cold-shrink cable joint includes an installation ring and a guide frame. The installation ring is the main assembly body of the device. An annular groove is formed within the ring body of the installation ring. The guide frame is radially slidably connected to the ring body of the installation ring via connecting rods. Multiple guide frames are provided and circumferentially distributed within the installation ring, with guide claws on their inner sides. The device also includes expansion rods slidably mounted on the guide claws of the guide frame. The expansion rods are used to circumferentially expand the cold-shrink tubing. A rotating ring is rotatably connected within the annular groove of the installation ring. The rotating ring has circumferentially spaced arc-shaped grooves, the number of which matches the number of guide frames. The connecting rods on the guide frame are... Located in the arc-shaped groove corresponding to the rotating ring, the mounting ring is provided with a driving component for driving the rotating ring to rotate; the mounting ring is provided with a telescopic mechanism for driving the expansion rod to slide; the telescopic mechanism includes a sliding rod fixedly connected to the end of each expansion rod, the sliding rod on the expansion rod faces outward and is slidably connected to the same guide plate, the guide plate is used to drive all expansion rods to move synchronously in telescopic motion, a second motor is fixedly installed on one of the guide frames, a second gear is fixedly installed on the output shaft of the second motor, and a toothed groove is opened on the expansion rod that slides with the guide frame, the second gear and the toothed groove on the expansion rod mesh with each other.

[0006] As a further preferred embodiment, the driving component includes a motor, a gear, and an arc-shaped rack. The motor is symmetrically fixedly mounted on the upper and lower parts of the mounting ring. Gears are fixedly mounted on the output shaft of the motor. Two arc-shaped racks are symmetrically arranged on the inner side of the rotating ring. The gears and the corresponding arc-shaped racks on the same side mesh with each other.

[0007] As a further preferred embodiment, the end of the expansion rod is detachably fitted with a tapered head, the end of which facing the wiring is a smooth spherical surface, and the tapered head facilitates the fitting of the cold shrink tubing onto the expansion rod.

[0008] As a further preferred embodiment, the tapered head has a number of protrusions fixed on its end face away from the wiring, the number of which is the same as the number of expansion rods. The gap between the protrusions and the expansion rods in the contracted state corresponds to the gap between them. The expansion rods have a slot on the side of their end that connects to the tapered head, and the side of the protrusions on the tapered head has an elastic retaining ball that fits the slot.

[0009] As a further preferred embodiment, each of the expansion rods has a plurality of pulleys evenly spaced on its inner side, the pulleys being used to slide in contact with the outer wall of the cable.

[0010] As a further preferred embodiment, a mounting shell is fixedly connected to one side of the outer wall of the mounting ring. The mounting shell is generally conical, and a gripping plate is symmetrically hinged to the shell of the mounting shell. The gripping plate can be neatly fitted into the mounting shell. Multiple clamping blocks are fixedly provided on the inner side of the gripping plate. The clamping blocks are elastic and are used to clamp the cable.

[0011] As a further preferred embodiment, an annular tube is fixedly installed on the guide plate, and an inlet for injecting silicone grease is provided on one side of the annular tube. An injection tube is embedded in the rod of the expansion rod, and the annular tube is connected to each injection tube. The injection tube has outlets evenly opened along the expansion rod, and the outlets are used to coat the outer wall of the expansion rod with silicone grease.

[0012] This invention also provides a method for quick installation of a cold-shrink cable joint, the specific steps of which are as follows:

[0013] S1) The cold shrink tubing is pre-fitted around the multiple expansion rods in the contracted state. The tapered head guides the cold shrink tubing to be smoothly fitted in. After fitting in, silicone grease is added to the injection tube through the ring tube. The silicone grease overflows from the outlet of the expansion rod and coats the inner wall of the cold shrink tubing.

[0014] S2) Start motor one, drive the rotating ring to rotate through gear one meshing with the arc rack. The arc groove on the rotating ring drives the guide frame to move outward along the mounting ring, thereby pushing the expansion rod to expand synchronously, so that the cold shrink tube is in the expanded state. Then, put the expanded cold shrink tube into the end of the cable after the insulation has been removed.

[0015] S3) Reverse start motor one, causing the rotating ring to rotate in the opposite direction and drive the expansion rod to contract radially, so that the expansion rod fits against the outer wall of the cable. Start motor two, and through gear two meshing with the toothed groove, push the expansion rod to slide axially. The guide plate drives all expansion rods to move away from the connection point synchronously. Under the blocking action of the guide frame, the cold shrink tubing gradually separates from the expansion rod and tightly wraps around the cable connection end, completing the quick installation of the cold shrink tubing. Finally, install the intermediate joint onto the port with the cold shrink tubing.

[0016] The present invention has the following advantages:

[0017] 1. This invention achieves automatic expansion, contraction and removal of cold shrink tubing through the synergistic action of components such as the mounting ring, rotating ring, guide frame and expansion rod. This avoids the elastic decay caused by the long-term high tension state of the pre-installed spiral support strip in traditional cold shrink tubing, thereby significantly improving the installation quality and efficiency of cable intermediate joints on the construction site.

[0018] 2. The expansion rod end of the present invention is designed as a detachable conical head structure. It can be quickly installed and replaced by the cooperation of elastic ball and slot, which is convenient for maintenance and easy to adapt to cold shrink tubing of different specifications. The front end of the conical head is a smooth spherical surface, which helps to guide the cold shrink tubing to be smoothly inserted, further improving the installation efficiency.

[0019] 3. The present invention can also effectively reduce the frictional resistance between the expansion rod and the cold shrink tube by using the silicone grease coating system of the annular tube and the injection tube, making it easier for the expansion rod to slide out of the cold shrink tube, and also enhance the sealing effect between the cold shrink tube and the cable, further improving the cable's waterproof and moisture-proof capabilities. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0021] Figure 2 This is a schematic diagram of the components of the present invention, including the mounting ring, guide frame, expansion rod, and rotating ring.

[0022] Figure 3 This is a schematic diagram of the expansion rod of the present invention with the tapered head in a retracted state.

[0023] Figure 4 This is a schematic diagram showing the mating relationship of components such as the mounting ring, guide frame, and rotating ring of the present invention.

[0024] Figure 5 This is a schematic diagram of the mounting ring, guide frame, connecting rod, and rotating ring of the present invention.

[0025] Figure 6 This is a diagram showing the connection relationships of components such as the expansion rod, sliding rod, and guide plate of the present invention.

[0026] Figure 7 This is a schematic diagram of the expansion rod, pulley, and conical head of the present invention.

[0027] Figure 8 This is a three-dimensional structural diagram of the protrusion and elastic retaining ball on the conical head of the present invention.

[0028] Figure 9 This is a schematic diagram of the mounting ring, mounting shell, gripping plate, and clamping block of the present invention.

[0029] Figure 10 This diagram shows the connection relationship between the guide plate, expansion rod, annular tube, and injection tube of the present invention.

[0030] Wherein: 100-Cable, 200-Cold shrink tubing, 1-Mounting ring, 2-Guide frame, 21-Connecting rod, 3-Expansion rod, 31-Toothed groove, 32-Card slot, 4-Rotating ring, 41-Arc groove, 5-Drive component, 51-Motor one, 52-Gear one, 53-Arc rack, 6-Telescopic mechanism, 61-Sliding rod, 62-Guide disc, 63-Motor two, 64-Gear two, 7-Conical head, 71-Protrusion, 72-Elastic ball, 8-Pulley, 9-Mounting shell, 10-Holding plate, 101-Clamping block, 11-Annular tube, 111-Injection tube, 112-Outlet. Detailed Implementation

[0031] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. The location descriptions selected in the specification, such as upper, lower, and lateral, also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes.

[0032] A quick-installation device for a cold-shrink cable joint; please refer to [link / reference]. Figures 1-6As shown, the device includes a mounting ring 1 and a guide frame 2. The mounting ring 1 is the main assembly body of the device. An annular groove is formed inside the ring of the mounting ring 1. The guide frame 2 is radially slidably connected to the ring of the mounting ring 1 via a connecting rod 21. The guide frame 2 has multiple guide claws distributed circumferentially within the mounting ring 1. The device also includes an expansion rod 3 slidably mounted on the guide claws of the guide frame 2. The expansion rod 3 is used to circumferentially expand the cold shrink tube 200. A rotating ring 4 is rotatably connected inside the annular groove of the mounting ring 1. The rotating ring 4 has an circumferentially spaced arc-shaped grooves 41 with the same number as the guide frame 2. The connecting rods 21 on the guide frame 2 are respectively located in the corresponding arc-shaped grooves 41 of the rotating ring 4. The mounting ring 1 is equipped with a driving component 5 for driving the rotating ring 4 to rotate; the mounting ring 1 is equipped with a telescopic mechanism 6 for driving the expansion rods 3 to slide; the telescopic mechanism 6 includes a sliding rod 61 fixedly connected to the end of each expansion rod 3, the sliding rods 61 on the expansion rods 3 facing outward and slidably connected to the same guide plate 62, the guide plate 62 is used to drive all expansion rods 3 to move synchronously telescopically, a second motor 63 is fixedly mounted on one of the guide frames 2, a second gear 64 is fixedly mounted on the output shaft of the second motor 63, the expansion rod 3 that slides with the guide frame 2 has a toothed groove 31, the second gear 64 and the toothed groove 31 on the expansion rod 3 mesh with each other, in the cable When using an intermediate connector for wiring, the cold shrink tubing 200 is pre-fitted onto the outer periphery of the multiple expansion rods 3 in their shrunken state. Then, the drive unit 5 drives the rotating ring 4 to rotate forward, causing the arc-shaped groove 41 of the rotating ring 4 to press against the corresponding connecting rod 21. This causes the guide frame 2 to drive the corresponding expansion rod 3 to expand radially along the mounting ring 1, keeping the cold shrink tubing 200 in an expanded state. The expanded cold shrink tubing 200 is then fitted onto the exposed end of the cable 100. Subsequently, the drive unit 5 drives the rotating ring 4 to rotate in the reverse direction, causing the expansion rods 3 to shrink radially along the mounting ring 1 and adhere to the outer wall of the cable 100. Finally, the motor 263 drives the gear 26... 4. Gear 2 64 meshes with toothed groove 31 to drive the corresponding expansion rod 3 to slide. At the same time, guide plate 62 drives all expansion rods 3 away from the wiring point under the guidance of corresponding guide frame 2 through sliding rod 61. At this time, the cold shrink tube 200 fitted onto cable 100 gradually detaches from the expansion rod 3 under the obstruction of guide frame 2. The cold shrink tube 200, which loses the support of expansion rod 3, will tightly wrap around the wiring end of cable 100 until the expansion rod 3 is completely pulled out from the cold shrink tube 200. This realizes the operation of quickly fitting cold shrink tube 200 at the wiring site of cable 100, breaking through the storage period of cold shrink tube 200 supported by spiral support, and improving the efficiency and reliability of cable installation intermediate joints.

[0033] Please see Figures 3-5As shown, the driving component 5 includes a motor 51, a gear 52, and an arc-shaped rack 53. The motor 51 is symmetrically fixedly mounted on the upper and lower parts of the mounting ring 1. The gear 52 is fixedly mounted on the output shaft of the motor 51. Two arc-shaped racks 53 are symmetrically arranged on the inner side of the rotating ring 4. The gear 52 and the corresponding arc-shaped rack 53 on the same side mesh with each other. The motor 51 drives the rotating ring 4 to rotate on the mounting ring 1 through the meshing of the gear 52 and the arc-shaped rack 53. After the arc groove 41 on the rotating ring 4 presses the connecting rod 21, the guide frame 2 drives the corresponding expansion rod 3 to flexibly expand and contract.

[0034] Please see Figure 2 and Figure 3 As shown, the end of the expansion rod 3 is detachably equipped with a tapered head 7. The end of the tapered head 7 facing the wiring is a smooth spherical surface, which makes it easy to put the cold shrink tube 200 onto the expansion rod 3.

[0035] Please see Figure 7 and Figure 8 As shown, the conical head 7 has a number of protrusions 71 fixed on its end face away from the wiring, which is the same as the number of expansion rods 3. The gap between the protrusions 71 and the expansion rods 3 in the contracted state corresponds to the gap between them. The expansion rods 3 have a slot 32 on the side of their end that connects to the conical head 7. The side of the protrusions 71 of the conical head 7 has an elastic ball 72 that fits the slot 32. The conical head 7 is elastically inserted into the slot 32 of the corresponding expansion rod 3 by the elastic ball 72 on the protrusions 71, so that the conical head 7 can be easily installed and removed from the expansion rods 3.

[0036] Please see Figure 6 and Figure 7 As shown, multiple pulleys 8 are evenly spaced on the inner side of each expansion rod 3. The pulleys 8 are used to slide in contact with the outer wall of the cable 100, thereby reducing the resistance when the expansion rod 3 is pulled out of the cable 100.

[0037] When using the auxiliary cable of this device to install intermediate joints, initially, the multiple expansion rods 3 inside the installation ring 1 are in a radially contracted state. At this time, the operator first installs the conical head 7 onto the end of the contracted expansion rod 3. The elastic retaining ball 72 of the conical head 7 then elastically engages with the corresponding slot 32 of the expansion rod 3. Subsequently, the operator slides the cold shrink tubing 200 along the conical head 7 into the outer periphery of the expansion rod 3. The smooth spherical surface design of the conical head 7 significantly reduces the insertion resistance and avoids scratching the tubing. When the cold shrink tubing 200 is correctly inserted into the expansion rod 3, the drive unit 5 is activated, and the motor 51 drives the gear 52 to mesh with the inner side of the rotating ring 4. The arc-shaped rack 53 forces the rotating ring 4 to rotate forward within the annular groove of the mounting ring 1. The circumferentially distributed arc-shaped grooves 41 of the rotating ring 4 then push the connecting rod 21 of the guide frame 2, causing all guide frames 2 to expand outward synchronously along the radial direction of the mounting ring 1. The expansion rod 3 is simultaneously opened under the constraint of the guide claw, and the cold shrink tube 200 is uniformly expanded to the predetermined diameter. Then, the operator holds the outer shell of the device and precisely inserts the cold shrink tube 200, which is in the expanded state, into the joint area of ​​the cable 100 where the insulation layer has been stripped. After the cold shrink tube 200 is positioned in the joint area of ​​the cable 100, the motor 51 is activated and rotated in reverse. The motor 51 drives the rotating ring 4. Reversing the direction, the arc-shaped groove 41 releases reverse pressure on the connecting rod 21, causing the guide frame 2 to drive the expansion rod 3 to contract radially synchronously until the expansion rod 3 is tightly attached to the outer wall of the cable 100. At this time, the pulleys 8 evenly distributed on the inner side of the expansion rod 3 roll into contact with the inner wall of the cold shrink tube 200. Then, the drive mechanism is activated, and the motor 2 63 drives the gear 2 64 to rotate. The rotating gear 2 64 meshes with the toothed groove 31 of the target expansion rod 3, thereby pushing the expansion rod 3 to slide axially along the guide claw. At this time, the sliding rod 61 of the expansion rod 3 will slide inward on the guide plate 62 and contract. Through the guide plate 62, the driving force is transmitted to each sliding rod 61. The expansion rods 3 are pushed forward to achieve synchronous axial retraction of all expansion rods 3. During this process, the cold shrink tube 200 is physically blocked by the guide frame 2 and remains at the cable joint. The expansion rods 3 continue to be pulled away from the cold shrink tube 200 in the direction away from the terminal. When the expansion rods 3 are completely separated from the cold shrink tube 200, the cold shrink tube 200, which has lost its mechanical support, continues to shrink radially due to the elastic memory effect, and finally tightly wraps the cable terminal to form an effective seal. Thus, the device completes the seamless conversion from mechanical support to elastic seal, breaks through the time limitation of traditional spiral supports, and improves the convenience of cold shrink tube 200 installation during cable wiring.

[0038] Please see Figure 1 and Figure 9As shown, a mounting shell 9 is fixedly connected to one side of the outer wall of the mounting ring 1. The mounting shell 9 is generally conical. A gripping plate 10 is symmetrically hinged to the shell of the mounting shell 9. The gripping plate 10 can be neatly fitted into the mounting shell 9. Multiple clamping blocks 101 are fixedly provided on the inner side of the gripping plate 10. The clamping blocks 101 are elastic and are used to clamp the cable 100. The operator holds the device and presses the gripping plate 10 so that the multiple clamping blocks 101 on the gripping plate 10 clamp the cable 100 inward, thereby improving the stability of the cable 100 when the cold shrink tubing 200 is sleeved.

[0039] Please see Figure 10 As shown, an annular tube 11 is fixedly installed on the guide plate 62. One side of the annular tube 11 is provided with a port for adding silicone grease. An injection tube 111 is embedded in the rod body of the expansion rod 3. The annular tube 11 and each injection tube 111 are connected. The injection tube 111 has outlets 112 evenly opened along the expansion rod 3. The outlets 112 are used to coat the silicone grease on the outer wall of the expansion rod 3. When the cold shrink tube 200 is sleeved on the expansion rod 3, the silicone grease can be applied to the inner wall of the cold shrink tube 200. The silicone grease can lubricate the inner wall of the cold shrink tube 200, making it easier for the expansion rod 3 to slide off the inner wall of the cold shrink tube 200. At the same time, the silicone grease can also improve the sealing performance of the cold shrink tube 200 after it is sleeved on the cable 100.

[0040] To improve the stability of the cable 100 terminals when the cold shrink tubing 200 is fitted onto the cable, the installation shell 9 is manually held and the holding plate 10 is pressed during operation. This causes the elastic clamping block 101 on the inner side of the holding plate 10 to clamp and tightly hold the cable 100. The clamping block 101 adapts to the elastic deformation of cables 100 of different diameters, effectively suppressing cable swaying during construction. Before the cold shrink tubing 200 is fitted onto the expansion rod 3, silicone grease can be pre-applied to the expansion rod 3 through the annular tube 11. The applied silicone grease is distributed through the annular tube 11 to each injection tube 111 and finally seeps out through the evenly distributed outlets 112 on the surface of the expansion rod 3, forming a continuous lubricating film on the outer wall of the expansion rod 3. This lubricating film is applied to the inner wall of the cold shrink tubing 200 when it is fitted onto the cable, ensuring low-friction sliding when the expansion rod 3 is withdrawn and filling the micro-gaps when the cold shrink tubing 200 finally shrinks, achieving the dual effects of dynamic lubrication and static sealing.

[0041] This invention also provides a method for quick installation of a cold-shrink cable joint, the specific steps of which are as follows:

[0042] S1) The cold shrink tubing 200 is pre-fitted around the multiple expansion rods 3 in the contracted state. The tapered head 7 guides the cold shrink tubing 200 to be smoothly fitted in. After fitting in, silicone grease is added to the injection tube 111 through the annular tube 11. The silicone grease overflows from the outlet 112 of the expansion rod 3 and coats the inner wall of the cold shrink tubing 200.

[0043] S2) Start motor 51, drive rotating ring 4 to rotate through gear 52 meshing with arc rack 53. Arc groove 41 on rotating ring 4 drives guide frame 2 to move outward along mounting ring 1, thereby pushing expansion rod 3 to expand synchronously, so that cold shrink tube 200 is in an expanded state. Then, put the expanded cold shrink tube 200 into the end of cable 100 after the insulation has been removed.

[0044] S3) Reverse start motor 51, causing the rotating ring 4 to rotate in the opposite direction and drive the expansion rod 3 to contract radially, so that the expansion rod 3 fits against the outer wall of the cable 100. Start motor 63, and through gear 64 meshing with toothed groove 31, push the expansion rod 3 to slide axially. Guide plate 62 drives all expansion rods 3 to move away from the connection point synchronously. Under the blocking action of guide frame 2, cold shrink tube 200 gradually separates from the expansion rod 3 and tightly wraps the connection end of cable 100, completing the quick installation of cold shrink tube 200. Finally, install the intermediate joint onto the port of the cold shrink tube 200.

Claims

1. A quick installation device for a cold-shrink cable intermediate joint, comprising an installation ring (1) and a guide frame (2), wherein the guide frame (2) is radially slidably connected to the installation ring (1) via a connecting rod (21), and the guide frame (2) is provided with multiple guide frames and is circumferentially distributed within the installation ring (1); Its features are, It also includes an expansion rod (3) that is slidably mounted on the guide frame (2), a rotating ring (4) is rotatably connected inside the mounting ring (1), the rotating ring (4) has circumferentially spaced arc-shaped grooves (41) of the same number as the guide frame (2), the connecting rods (21) on the guide frame (2) are respectively located in the corresponding arc-shaped grooves (41) of the rotating ring (4), and the mounting ring (1) is provided with a driving component (5) for driving the rotating ring (4) to rotate; The mounting ring (1) is provided with a telescopic mechanism (6) for driving the expansion rod (3) to slide; The telescopic mechanism (6) includes a sliding rod (61) fixed to the end of each of the expansion rods (3). The sliding rods (61) on the expansion rods (3) face outward and are slidably connected to the same guide plate (62). A motor (63) is fixedly installed on one of the guide frames (2). A gear (64) is fixedly installed on the output shaft of the motor (63). A toothed groove (31) is opened on the expansion rod (3) that slides with the guide frame (2). The gear (64) and the toothed groove (31) on the expansion rod (3) mesh with each other.

2. The quick installation device for a cold-shrink cable joint as described in claim 1, characterized in that, The driving component (5) includes a motor (51), a gear (52) and an arc rack (53). The motor (51) is symmetrically fixedly mounted on the upper and lower parts of the mounting ring (1). The gear (52) is fixedly mounted on the output shaft of the motor (51). Two arc racks (53) are symmetrically arranged on the inner side of the rotating ring (4). The gear (52) and the corresponding arc rack (53) on the same side mesh with each other.

3. The quick-installation device for a cold-shrink cable joint as described in claim 2, characterized in that, The expansion rod (3) is detachably fitted with a conical head (7) at its end, and the end of the conical head (7) facing the wiring is a smooth spherical surface.

4. The quick installation device for a cold-shrink cable joint as described in claim 3, characterized in that, The conical head (7) has a fixed protrusion (71) on the end face away from the wiring, which is the same number as the expansion rod (3). The protrusion (71) corresponds to the gap between the expansion rod (3) in the contracted state. The expansion rod (3) has a slot (32) on the side of the end of the conical head (7) that connects to it. The side of the protrusion (71) of the conical head (7) has an elastic ball (72) that matches the slot (32).

5. The quick-installation device for a cold-shrink cable joint as described in claim 4, characterized in that, Each of the expansion rods (3) has multiple pulleys (8) evenly spaced on its inner side.

6. The quick-installation device for a cold-shrink cable joint as described in claim 5, characterized in that, The mounting ring (1) is fixedly connected to one side of the outer wall of the mounting shell (9). The mounting shell (9) is generally conical. A gripping plate (10) is symmetrically hinged on the shell of the mounting shell (9). The gripping plate (10) can be neatly fitted into the mounting shell (9). A plurality of clamping blocks (101) are fixedly provided on the inner side of the gripping plate (10).

7. The quick-installation device for a cold-shrink cable joint as described in claim 6, characterized in that, An annular tube (11) is fixedly installed on the disc body of the guide plate (62). The annular tube (11) has an opening for adding silicone grease on one side. An injection tube (111) is embedded in the rod body of the expansion rod (3). The annular tube (11) and each injection tube (111) are connected. The injection tube (111) has an outlet (112) evenly opened along the expansion rod (3).

8. A method for quick installation of a cold-shrink cable joint, employing the quick installation device for a cold-shrink cable joint as described in claim 7, characterized in that... The specific steps are as follows: S1) The cold shrink tube (200) is pre-fitted around the multiple expansion rods (3) in the shrinking state. The cold shrink tube (200) is guided to be fitted smoothly through the conical head (7). After fitting, silicone grease is added to the injection tube (111) through the ring tube (11). The silicone grease overflows from the outlet (112) of the expansion rod (3) and coats the inner wall of the cold shrink tube (200). S2) Start the motor (51). The rotating ring (4) is driven to rotate through the meshing of the gear (52) and the arc rack (53). The arc groove (41) on the rotating ring (4) drives the guide frame (2) to move outward along the mounting ring (1), thereby pushing the expansion rods (3) to expand synchronously, so that the cold shrink tube (200) is in the expanded state. Then, the cold shrink tube (200) in the expanded state is fitted into the end of the cable (100) after the insulation has been removed. S3) Reverse start motor one (51) to make the rotating ring (4) rotate in the opposite direction and drive the expansion rod (3) to shrink radially, so that the expansion rod (3) fits against the outer wall of the cable (100). Start motor two (63) and push the expansion rod (3) to slide axially through the meshing of gear two (64) and toothed groove (31). The guide plate (62) drives all the expansion rods (3) to move away from the connection point in sync. Under the blocking action of the guide frame (2), the cold shrink tube (200) gradually separates from the expansion rod (3) and tightly wraps the connection end of the cable (100), completing the quick installation of the cold shrink tube (200). Finally, install the intermediate joint onto the port of the cold shrink tube (200).

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