Sealing connection method for cable and cable joint

Abstract

The invention relates to the technical field of cable connection, in particular to a sealing connection method for a cable and a cable joint, which comprises the following steps of: sleeving a heat shrinkable tube on the cable, cutting and stripping a connection area of the cable according to a preset position and length, and connecting the cable with the cable joint. A connection area is formed at the joint of the cable and the cable joint, multi-layer protection processing is carried out on the connection area of the cable and the cable joint, a hot melt adhesive tape is wound on the connection area of the cable and the cable joint, the heat shrink tube is moved to the position where the hot melt adhesive tape is located, and the connection area is heated through a hot air gun. According to the invention, through the arrangement of the hot melt adhesive tape, after a connection area is heated to a certain temperature through the hot air gun, the hot melt adhesive tape has excellent fluidity, any tiny gaps and irregular spaces between a cable and a cable joint and a heat shrink tube can be filled, seamless sealing is formed, permeation of various media is effectively prevented, and the service life of the cable is prolonged. And good sealing integrity can be kept.

Description

Technical Field

[0001] The present invention relates to the technical field of cable connection, and particularly relates to a method for sealing connection of a cable and a cable joint. Background Art

[0002] The life of the whole society and industrial production are inseparable from cables, and the safety and reliability of cables are related to the stability of life and production. After the cables are laid, in order to extend the line length or connect required equipment, etc., it is usually necessary to connect the cables and cable joints.

[0003] Currently, for the sealing connection method between a cable and a cable joint, first, the end of the cable copper core and the connection part of the cable joint are tightly wound with a PTFE tape, secondly, a high-voltage insulating tape is used for secondary protection, thirdly, a waterproof sealing tape is used for sealing, and finally, a high-voltage insulating cold shrinkable sleeve is used, and heat shrinkable tubes are respectively sleeved at both ends of the sleeve to perform heat shrinkage sealing on both ends of the cold shrinkable tube.

[0004] However, due to the poor surface flatness that may occur when winding the PTFE tape, high-voltage insulating tape, and waterproof sealing tape, the shape of the gap between the high-voltage insulating cold shrinkable sleeve and the cable and the cable joint is irregular. When the high-voltage insulating cold shrinkable sleeve and the heat shrinkable tube do not shrink sufficiently, it is easy to result in poor fit between the high-voltage insulating cold shrinkable sleeve and the cable and the cable joint, affecting the sealing performance, and it is easy for foreign matters to enter the gap, leading to problems such as water leakage and moisture return. Summary of the Invention

[0005] (1) The problem to be solved by the present invention is: how to improve the sealing performance of the connection area between the cable and the cable joint.

[0006] (2) Technical Solution

[0007] A method for sealing connection of a cable and a cable joint provided by the present invention is used for the connection of a cable and a cable joint. The cable sequentially includes a protective layer, an insulating layer, a semiconductor layer, an armored copper skin, and a copper core from outside to inside, and includes the following steps:

[0008] S1: Sleeve a heat shrinkable tube on the cable, and perform cutting and peeling treatment on the connection area of the cable according to a predetermined position and length;

[0009] S2: Connect the cable and the cable joint, and a connection area is formed at the connection of the cable and the cable joint;

[0010] S3: Perform multi-layer protection treatment on the connection area of the cable and the cable joint;

[0011] S4: Wind a hot melt adhesive strip on the connection area of the cable and the cable joint;

[0012] S5: Move the heat shrinkable tube to the position where the hot melt adhesive strip is located, and heat the connection area with a hot air gun;

[0013] S6: Wrap and seal both ends of the heat shrinkable tube with a low-voltage tape.

[0014] According to an embodiment of the present invention, between the steps S4 and S5, the following steps are further included:

[0015] Soften the hot melt adhesive strip with a hot air gun.

[0016] According to an embodiment of the present invention, in the step S1, the following steps are specifically included:

[0017] S11: Wipe the cable protective layer clean and slip the heat shrinkable tube onto the cable;

[0018] S12: Cut and strip the protective layer, armored copper skin, and semiconductor layer in sequence. The stripping length of the armored copper skin is less than that of the protective layer;

[0019] S13: Circumferentially cut the insulation layer 1 - 3 cm from the end of the cable copper core, and strip the insulation layer after cutting a tapered surface 1 - 2 cm from the insulation layer break.

[0020] According to an embodiment of the present invention, in the step S12, the following steps are specifically included:

[0021] Use an electrician's knife to make a circumferential cut 10 - 20 cm from the end of the cable, and then cut through the protective layer towards the end of the cable;

[0022] Use a flat-nose pliers to strip the cut protective layer to expose the armored copper skin;

[0023] Strip the armored copper skin, slip on a metal ring, install a grounding wire, and connect the end of the grounding wire to the armored copper skin;

[0024] Strip the semiconductor layer to expose the insulation layer.

[0025] According to an embodiment of the present invention, between the steps S1 and S2, the following steps are further included:

[0026] Slip the heat shrink inner tube onto the cable.

[0027] According to an embodiment of the present invention, in the step S2, the following steps are specifically included:

[0028] Crimp the connection part between the copper core of the cable and the cable joint. Use a crimping pliers to make the first crimp 1 mm from the joint, turn the cable over, and make the second crimp 1 mm from the first crimp position.

[0029] According to an embodiment of the present invention, in the step S3, the following steps are specifically included:

[0030] S31: Wrap and cover from the conical surface of the cable insulation layer towards the conical surface of the cable joint using PTFE tape, completely covering the conical surface of the cable insulation layer, the conical surface of the cable joint, and the area between the two conical surfaces and making it flush with the outer surface of the insulation layer;

[0031] S32: Use high-voltage insulating tape to start winding from the half position where the insulation layer is exposed towards the cable joint until it is wound onto the cable joint;

[0032] S33: Use the second waterproof sealing tape to wind the protective layer for 8 - 12 cm from the position near the grounding wire of the protective layer towards the direction away from the connection area, place the grounding wire on the protective layer where the second waterproof sealing tape is wound, and wind the second waterproof sealing tape in the reverse direction to completely cover the grounding wire and the connection area.

[0033] According to an embodiment of the present invention, in the steps S32 and S33, the following steps are further included:

[0034] Move the heat-shrinkable inner tube to the area where the high-voltage insulating tape is located. At this time, one end of the heat-shrinkable inner tube is on the cable and the other end is on the cable joint, and use a hot air gun to shrink the heat-shrinkable inner tube;

[0035] Cut an appropriate length of the first waterproof sealing tape, start winding the first waterproof sealing tape from the end of the metal ring until it is wound to the end of the heat-shrinkable inner tube, and wind the same length of the first waterproof sealing tape on the other end of the heat-shrinkable inner tube.

[0036] According to an embodiment of the present invention, in the step S4, the following steps are specifically included:

[0037] The length of the heat-shrinkable tube is less than the length of the second waterproof sealing tape, so that both ends of the second waterproof sealing tape are exposed.

[0038] According to an embodiment of the present invention, in the step S6, the following steps are specifically included:

[0039] Use low-voltage tape to wind the two ends of the heat-shrinkable tube and the second waterproof sealing tape together.

[0040] Advantages of the present invention:

[0041] Use heat shrink tubing for heat shrink sealing. Even if the heat shrink tubing does not shrink sufficiently, with the provided hot melt adhesive strip, after heating the connection area to a certain temperature with a hot air gun, the hot melt adhesive strip has excellent fluidity and can fill any tiny gaps and irregular spaces between the cable, cable joint, and heat shrink tubing, forming a seamless seal, effectively preventing the penetration of various media. During long-term use, it can maintain good sealing integrity. Using the hot melt adhesive strip and heat shrink tubing to replace the traditional high-voltage insulating cold shrink sleeve to achieve the sealed connection of the connection area between the cable and cable joint improves the sealing performance of the cable and cable joint, making it difficult for foreign objects to enter and less likely to have problems such as water leakage and moisture return. Brief Description of the Drawings

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is an exploded view of a cable, cable joint, sealed connection structure, hot melt adhesive strip, heat shrink tubing, and low-voltage tape provided by an embodiment of the present invention;

[0044] Figure 2 It is a sectional perspective view of a cable, sealed connection structure, hot melt adhesive strip, heat shrink tubing, and low-voltage tape provided by an embodiment of the present invention;

[0045] Figure 3 Provided by an embodiment of the present invention Figure 2 An enlarged view of part A;

[0046] Figure 4 It is an exploded view of a cable provided by an embodiment of the present invention;

[0047] Figure 5 It is a schematic diagram of the steps of a method for sealing and connecting a cable and a cable joint provided by an embodiment of the present invention.

[0048] Reference Signs: 1, protective layer; 2, armored copper skin; 3, semiconductor layer; 4, insulating layer; 5, copper core; 6, PTFE tape; 7, high-voltage insulating tape; 8, heat shrink inner tube; 9, first waterproof sealing tape; 10, second waterproof sealing tape; 11, hot melt adhesive strip; 12, heat shrink tubing; 13, low-voltage tape; 14, grounding wire. Detailed Embodiments

[0049] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] As Figures 1 - 5 shown, an embodiment of the present invention provides a method for sealing and connecting a cable and a cable joint for connecting a cable and a cable joint. The cable sequentially includes a protective layer 1, an armored copper skin 2, a semiconductor layer 3, an insulating layer 4, and a copper core 5 from outside to inside, and includes the following steps:

[0051] S1: Slip a heat shrink tube 12 onto the cable and perform cutting and peeling treatment on the connection area of the cable according to a predetermined position and length;

[0052] S2: Connect the cable to the cable joint, and a connection area is formed at the connection of the cable and the cable joint;

[0053] S3: Perform multi-layer protection treatment on the connection area of the cable and the cable joint;

[0054] S4: Wind a hot melt adhesive strip 11 around the connection area of the cable and the cable joint;

[0055] S5: Move the heat shrink tube 12 to the position where the hot melt adhesive strip 11 is located, and heat the connection area with a hot air gun;

[0056] S6: Use a low-voltage tape 13 to wind and seal both ends of the heat shrink tube 12.

[0057] When using the heat shrink tube 12 for heat shrink sealing, even if the heat shrink tube 12 does not shrink sufficiently, through the provided hot melt adhesive strip 11, when the connection area is heated to a certain temperature by the hot air gun, the hot melt adhesive strip 11 has excellent fluidity and can fill any tiny gaps and irregular spaces between the cable, the cable joint, and the heat shrink tube 12 to form a seamless seal, effectively preventing the penetration of various media. During long-term use, it can maintain good sealing integrity. Using the hot melt adhesive strip 11 and the heat shrink tube 12 to replace the traditional high-voltage insulating cold shrink sleeve to realize the sealed connection of the connection area of the cable and the cable joint improves the sealing performance of the cable and the cable joint, is not easy for foreign objects to enter, and is not easy to have problems such as water leakage and moisture return.

[0058] Through the provided low-voltage tape 13, the ends of the hot melt adhesive strip 11 and the heat shrink tube 12 can be hermetically connected. Tighten and wind the low-voltage tape 13, with a high degree of fit, further playing an insulating and sealing role.

[0059] The method for hermetically connecting a cable and a cable joint hermetically connects the cable and the cable joint by using a hermetic connection structure, a hot-melt adhesive strip 11 and a heat-shrinkable tube 12. In step S3, the connection area between the cable and the cable joint is subjected to multi-layer protection treatment through the hermetic connection structure. The hermetic connection structure includes a PTFE tape 6, a high-voltage insulating tape 7, a heat-shrinkable inner tube 8, a first waterproof sealing tape 9 and a second waterproof sealing tape 10.

[0060] The connection area of the cable refers to the section of the cable that is hermetically connected to the cable joint.

[0061] According to an embodiment of the present invention, between steps S4 and S5, the following steps are further included:

[0062] Soften the hot-melt adhesive strip 11 with a hot air gun. It should be noted that the hot air gun heats the hot-melt adhesive strip 11 from a translucent solid state to a transparent solid state.

[0063] Since in practical applications, after the hot-melt adhesive strip 11 is wound around the connection area and then the heat-shrinkable tube 12 is moved to the corresponding area of the hot-melt adhesive strip 11, when heating the hot-melt adhesive strip 11 and the heat-shrinkable tube 12 together with a hot air gun, there will be a situation where the melting degree of some of the hot-melt adhesive strip 11 is poor. Therefore, between step S4 and step S5, first use a hot air gun to soften the hot-melt adhesive strip 11, which is convenient for the subsequent hot-melt adhesive strip 11 to achieve a better sealing effect.

[0064] According to an embodiment of the present invention, in step S1, the following steps are specifically included:

[0065] S11: Wipe the cable protective layer 1 clean and put the heat-shrinkable tube 12 on the cable;

[0066] S12: Cut and strip the protective layer 1, the armored copper skin 2 and the semiconductor layer 3 in sequence, and the stripping length of the armored copper skin 2 is less than the stripping length of the protective layer 1;

[0067] S13: Circumferentially cut the insulating layer 4 at a position 1-3 cm from the end of the cable copper core 5, and cut out a tapered surface at a position 1-2 cm from the break of the insulating layer 4 and then strip the insulating layer 4.

[0068] Preferably, circumferentially cut at a position 2 cm from the end of the cable copper core 5. The circumferential cutting position is the break. Circumferentially cut the insulating layer 4, and cut out a tapered surface at a position 1.5 cm from the break of the insulating layer 4 and then strip the insulating layer 4. Among them, the position 1.5 cm from the break of the insulating layer 4 is the position 3.5 cm from the end of the copper core 5. The stress surface range is to cut out the stress surface in the range from the break to 1.5 cm from the break. After cutting the stress surface, strip the insulating layer 4, which can prevent damage to the cable copper core 5 during the process of cutting the stress surface.

[0069] According to an embodiment of the present invention, in step S12, the following steps are specifically included:

[0070] Use an electrician's knife to make a circumferential cut at a position 10 - 20 cm away from the end of the cable, and then cut through the protective layer 1 towards the end of the cable;

[0071] Use a flat-nose pliers to peel off the cut protective layer 1 to expose the armored copper skin 2;

[0072] Peel off the armored copper skin 2, slip on a metal ring, install the grounding wire 14, and connect the end of the grounding wire 14 to the armored copper skin 2;

[0073] Peel off the semiconductor layer 3 to expose the insulating layer 4.

[0074] Preferably, make a circumferential cut at a position 15 cm away from the end of the cable. The length of the armored copper skin 2 is 1.5 cm shorter than the length of the protective layer 1, that is, the length of the armored copper skin 2 exposed from the protective layer 1 is 1.5 cm, and install a metal ring and connect the grounding wire 14 at this position.

[0075] Method for peeling the semiconductor layer 3: Make a circumferential cut on the semiconductor layer 3 according to the installation position of the grounding wire 14, cut perpendicularly to the circumferential cut position towards the cable joint direction, finally rotate the cable 180 degrees, and then cut perpendicularly to the circumferential cut position towards the end of the cable direction again, and use a flat-nose pliers to peel off the semiconductor layer 3.

[0076] According to an embodiment of the present invention, between steps S1 and S2, the following steps are further included:

[0077] Slip the heat-shrinkable inner tube 8 onto the cable.

[0078] According to an embodiment of the present invention, in step S2, the following steps are specifically included:

[0079] Crimp the connection part between the copper core 5 of the cable and the cable joint. Use a crimping pliers to make the first crimp at a position 1 mm away from the joint, turn the cable over, and make the second crimp at a position 1 mm away from the first crimp position. Here, the joint refers to the position where the copper core 5 of the cable is close to the conical surface end and is exposed.

[0080] It should be noted that turning the cable over means rotating it 180 degrees around the axis of the cable, and the position of the second crimp is 2 mm away from the joint.

[0081] Of course, in this embodiment, the distances of the first crimp and the second crimp from the joint are adjusted according to the specifications of the actual cable and the cable joint.

[0082] The cable joint itself has a conical surface and a connection part, and the connection part of the cable joint includes a metal tube.

[0083] According to an embodiment of the present invention, in step S3, the following steps are specifically included:

[0084] S31: Wrap and cover from the conical surface of the cable insulation layer 4 towards the conical surface of the cable joint with the PTFE tape 6, completely covering the conical surface of the cable insulation layer 4, the conical surface of the cable joint, and the area between the two conical surfaces, and making it flush with the outer surface of the insulation layer 4;

[0085] S32: Start winding with the high-voltage insulation tape 7 from the half-exposed position of the insulation layer 4 towards the cable joint until it is wound onto the cable joint;

[0086] S33: Use the second waterproof sealing tape 10 to wind the protective layer 1 for 8 - 12 cm from the position near the grounding wire 14 of the protective layer 1 in the direction away from the connection area, place the grounding wire 14 on the protective layer 1 where the second waterproof sealing tape 10 is wound, and wind the second waterproof sealing tape 10 in the reverse direction to completely wrap the grounding wire 14 and the connection area.

[0087] Among them, when winding the PTFE tape 6, it should be ensured that the PTFE tape 6 is wound tightly without gaps, and is in close contact with the conical surfaces of the cable and the cable joint and the part between the two conical surfaces. Moreover, after winding the PTFE tape 6, this area should be wound flat and be flush with the insulation layer 2.

[0088] When winding the high-voltage insulation tape 7, the high-voltage insulation tape 7 should be stretched to 200% and then wound, and during the winding process, the 200% stretching state should be maintained at all times;

[0089] Both the first waterproof sealing tape 9 and the second waterproof sealing tape 10 need to be stretched before winding, but they cannot be pulled apart.

[0090] When the second waterproof sealing tape 10 is wound for the first time in the direction away from the connection area, move the grounding wire 14 away and do not wind it. When it is wound back (i.e., in the direction towards the connection area), stick the grounding wire on the protective layer 1 where the second waterproof sealing tape 10 has been wound once, and completely wrap the grounding wire 14 and the connection area to ensure a double-layer waterproof effect. As Figure 3 shown, because the first waterproof sealing tape 9 only seals and winds the end of the heat-shrinkable inner tube 8, therefore, Figure 3 the first waterproof sealing tape 9 cannot be seen in the cross-sectional view in . The first waterproof sealing tape 9 is actually located between the heat-shrinkable inner tube 8 and the second waterproof sealing tape 10.

[0091] According to an embodiment of the present invention, in steps S32 and S33, the following steps are further included:

[0092] Move the heat-shrinkable inner tube 8 to the area where the high-voltage insulation tape 7 is located. At this time, one end of the heat-shrinkable inner tube 8 is on the cable, and the other end is on the cable joint, and use a hot air gun to make the heat-shrinkable inner tube 8 shrink;

[0093] Cut a first waterproof sealing tape 9 of an appropriate length, and start winding the first waterproof sealing tape 9 from the end of the metal ring until it is wound to the end of the heat-shrinkable inner tube 8. Wind the first waterproof sealing tape 9 of the same length around the other end of the heat-shrinkable inner tube 8.

[0094] The inner diameter of the heat-shrinkable inner tube 8 is larger than the outer diameter of the cable protective layer 1, and the diameter of the heat-shrinkable inner tube 8 is smaller than the diameter of the heat-shrinkable tube 12.

[0095] By providing the heat-shrinkable inner tube 8, the high-voltage insulating tape 7 and the PTFE tape 6 can be fixed, and the sealing effect at the connection area can be enhanced. After the heat-shrinkable inner tube 8 is uniformly heat-shrunk, its surface is convenient for winding the second waterproof sealing tape 10, making the effect of the second waterproof sealing tape 10 better.

[0096] According to an embodiment of the present invention, in step S4, it specifically includes the following steps:

[0097] The length of the heat-shrinkable tube 12 is less than the length of the second waterproof sealing tape 10, so that both ends of the second waterproof sealing tape 10 are exposed. According to an embodiment of the present invention, in step S6, it specifically includes the following steps:

[0098] Use a low-voltage tape 13 to wind the two ends of the heat-shrinkable tube 12 and the second waterproof sealing tape 10 together.

[0099] It should be noted that a part of both ends of the second waterproof sealing tape 10 is exposed. By winding the heat-shrinkable tube 12 and the second waterproof sealing tape 10 together with the low-voltage tape 13, there is a second waterproof sealing tape 10 for transition between the protective layer 1 and the heat-shrinkable tube 12 when the low-voltage tape 13 is wound, which is convenient for winding the low-voltage tape.

[0100] Specifically, such as Figure 1 and Figure 5As shown, wipe the protective layer 1 of the cable clean. Use an electrician's knife to make a circumferential cut 15 cm from the end of the cable, and then cut through the protective layer 1 towards the end of the cable. Use a flat-nose pliers to peel off the cut protective layer 1 to expose the armored copper skin 2. Peel off the armored copper skin 2 for 13.5 cm, slip on a metal ring, install the grounding wire 14, and tightly connect the end of the grounding wire 14 to the armored copper skin 2. Peel off the semiconductor layer 3 to expose the insulating layer 4. Make a circumferential cut 2 cm from the end of the copper core 5 of the cable (i.e., the end of the cable), and cut a stress surface 1.5 cm from the cutting fracture. Keep the cut surface flat and smooth. Then remove the 2-cm insulating layer 4 that was circumferentially cut before. Slip the heat-shrinkable tube 12 and the heat-shrinkable inner tube 8 onto the cable. Connect the cable and the cable joint (insert the copper core 5 of the cable into the metal tube of the cable joint). Use a crimping pliers to crimp at a point 1 mm from the joint, then move backward, rotate 180 degrees at a point 1 mm from the first crimping point, and crimp. The forward and reverse crimping ensures firm crimping without looseness. Use a Teflon tape 6 to wrap around the conical surface (stress surface) and the part between the conical surfaces of the cable and the cable joint until it is flush with the outer surface of the insulating layer 4. Use a high-voltage insulating tape 7 to start wrapping from half of the length of the exposed insulating layer 4 until it is flush with the protective layer 1. After completion, move the heat-shrinkable inner tube 8 to the position of the high-voltage insulating tape 7 and heat-shrink it with a hot air gun. Then wrap the two ends of the heat-shrinkable inner tube 8 with the first waterproof sealing tape 9 for waterproof sealing. When using the second waterproof sealing tape 10 to wrap in the first direction away from the connection area, move the grounding wire 14 away and do not wrap it. When it is wrapped back, stick the grounding wire 14 on the protective layer 1 that has been wrapped with the second waterproof sealing tape 10 once to completely wrap the grounding wire 14 and the connection area. Continue to wrap the hot melt adhesive strip 11 and soften it with a hot air gun until it becomes transparent and solid. Move the heat-shrinkable tube 12 to the position of the hot melt adhesive strip 11 and heat-shrink it with a hot air gun. Finally, wrap black low-voltage tapes on both sides of the heat-shrinkable tube 12 to complete the sealed connection of the entire cable and the cable joint.

[0101] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0102] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the connection inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more than two.

[0103] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealing connection method for a cable and a cable connector, used for connecting a cable and a cable connector, wherein the cable comprises a protective layer (1), an armored copper skin (2), a semiconductor layer (3), an insulating layer (4) and a copper core (5) from the outside to the inside, characterized in that: The following steps are involved: S1: putting a heat shrink tube (12) on the cable, and cutting and stripping the connection area of ​​the cable according to a predetermined position and length; S2: Connect the cable to the cable connector, and the connection between the cable and the cable connector forms a connection area; S3: Multi-layer protection treatment is applied to the connection area of ​​cables and cable connectors; S4: Wrapping a hot melt adhesive strip (11) around the connection area between the cable and the cable connector; S5: Move the heat shrink tube (12) to the location of the hot melt adhesive strip (11), and heat the connection area with a hot air gun; S6: Use low-pressure tape (13) to wrap and seal the two ends of the heat shrink tube (12).

2. A method for sealing and connecting a cable and a cable joint according to claim 1, characterized in that: Between the steps S4 and S5, the following steps are also included: Use a heat gun to soften the hot melt adhesive strip (11).

3. A method for sealing and connecting a cable and a cable joint according to claim 1, characterized in that: In the step S1, the following steps are specifically included: S11: Wipe the cable protective layer (1) clean and put the heat shrink tube (12) onto the cable; S12: cutting and peeling off the protective layer (1), the armored copper skin (2) and the semiconductor layer (3) in sequence, wherein the peeling length of the armored copper skin (2) is shorter than the peeling length of the protective layer (1); S13: The insulating layer (4) is cut in a ring at a distance of 1 to 3 cm from the end of the cable copper core (5), and a conical surface is cut out at a distance of 1 to 2 cm from the fracture of the insulating layer (4), and then the insulating layer (4) is peeled off.

4. A method for sealing and connecting a cable and a cable joint according to claim 3, characterized in that: In the step S12, the following steps are specifically included: Use an electrician's knife to make a circular cut 10-20 cm away from the cable end, and then cut through the protective layer towards the cable end (1); Use flat-nosed pliers to peel off the scratched protective layer (1) to expose the armored copper skin (2); The armored copper sheet (2) is peeled off, a metal ring is installed, a grounding wire (14) is installed, and the end of the grounding wire (14) is connected to the armored copper sheet (2); The semiconductor layer (3) is peeled off to expose the insulating layer (4).

5. A method for sealing and connecting a cable and a cable joint according to claim 3, characterized in that: Between the steps S1 and S2, the following steps are also included: The heat shrinkable inner tube (8) is put on the cable.

6. A method for sealing and connecting a cable and a cable joint according to claim 1, characterized in that: In the step S2, the following steps are specifically included: The copper core (5) of the cable is crimped to the connection part of the cable connector, and a crimping pliers is used to perform the first crimping at a distance of 1 mm from the contact point. The cable is turned over and a second crimping is performed at a distance of 1 mm from the first crimping position.

7. A method for sealing and connecting a cable and a cable joint according to claim 5, characterized in that: In the step S3, the following steps are specifically included: S31: Use a polytetrafluoroethylene tape (6) to wrap the conical surface of the cable insulation layer (4) toward the conical surface of the cable connector, so that the conical surface of the cable insulation layer (4), the conical surface of the cable connector and the area between the two conical surfaces are completely wrapped and flush with the outer surface of the insulation layer (4); S32: Use the high-voltage insulating tape (7) to start winding from the exposed half of the insulating layer (4) toward the cable connector until it reaches the cable connector; S33: Use the second waterproof sealing tape (10) to wrap the protective layer (1) for 8-12 cm from the position of the protective layer (1) close to the grounding wire (14) in the direction away from the connection area, place the grounding wire (14) on the protective layer (1) wrapped with the second waterproof sealing tape (10), and wrap the second waterproof sealing tape (10) in the reverse direction to completely wrap the grounding wire (14) and the connection area.

8. A method for sealing and connecting a cable and a cable joint according to claim 7, characterized in that: In the steps S32 and S33, the following steps are also included: Move the heat shrink inner tube (8) to the area where the high-voltage insulating tape (7) is located. At this time, one end of the heat shrink inner tube (8) is located on the cable and the other end is located on the cable connector. Use a hot air gun to shrink the heat shrink inner tube (8); A first waterproof sealing tape (9) of appropriate length is cut and wound around the first waterproof sealing tape (9) from the end of the metal ring until it reaches the end of the heat shrinkable inner tube (8), and the other end of the heat shrinkable inner tube (8) is wound around the first waterproof sealing tape (9) of the same length.

9. A method for sealing and connecting cables and cable joints according to claim 1, characterized in that: In the step S4, the following steps are specifically included: The length of the heat shrink tube (12) is smaller than the length of the second waterproof sealing tape (10), so that both ends of the second waterproof sealing tape (10) are exposed.

10. A method for sealing and connecting a cable and a cable joint according to claim 9, characterized in that: In the step S6, the following steps are specifically included: The two ends of the heat shrink tube (12) and the second waterproof sealing tape (10) are wrapped together using a low-pressure tape (13).

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