Cable accessory tail packaging structure and packaging method

Abstract

The invention relates to the technical field of high-voltage power transmission, and discloses a cable accessory tail packaging structure and packaging method. Comprising a lead sealing layer, an insulating layer, a waterproof layer and a heat shrink tube. The lead sealing layer wraps the periphery of the joint of the tail pipe and the transition piece. The insulating layer wraps the periphery of the lead sealing layer. And the waterproof layer coats the joint of the smooth aluminum sheath and the transition piece and the insulating layer. The periphery of the waterproof layer is coated with the heat shrink tube, and the heat shrink tube is attached to the peripheral wall of the tail tube and the peripheral wall of the waterproof layer. Therefore, the insulating layer, the waterproof layer and the heat shrink tube perform multi-layer sealing on the connection position of the tail tube of the cable accessory and the cable, the connection strength is improved, the influence of the external environment on the connection position of the cable accessory and the cable is reduced, and the fault occurrence probability is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage power transmission, and in particular to a cable accessory tail packaging structure and a packaging method. Background Art

[0002] Among the many components of high-voltage cable systems, cable accessories are relatively complex in structure and operate under harsh conditions, resulting in a significantly higher probability of failure than other products and being most susceptible to external factors. When connecting cables to cable accessories, the connection between the cable accessory and the cable is typically sealed at the end. However, line failures caused by cracks in the sealing structure at the end of the cable accessory are common. Cracks in this area can lead to poor grounding, sparking between the outer shield, the metal sheath, and the tail tube, burning the cable's outer shield and insulation. Moisture from the air can easily enter the cracked area, causing moisture to enter the cable insulation, degrading insulation performance, and corroding the metal sheath, leading to line failures. To prevent burns to the cable insulation shield and main body, a diameter expansion process is often used to alter the tight contact between the smooth aluminum sheath and the buffer layer. First, the smooth aluminum sheath is expanded to a flared shape using a dedicated expansion tool. An aluminum transition piece with a tapered end and an inner diameter larger than the smooth aluminum sheath is then welded to the expanded smooth aluminum sheath and connected to the cable accessory through the transition piece. Finally, a lead seal is applied between the transition piece and the end of the cable accessory. However, the connection strength between the cable and the cable accessories is insufficient and the sealing is low. The connection is easily affected by temperature changes and erosion by wind and rain, causing cracking. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that in the prior art, the connection strength between the cable and the cable accessories is insufficient, the sealing is low, and the connection is easily affected by temperature changes and erosion by wind and rain and cracks.

[0004] In order to solve the above technical problems, the present invention provides a cable accessory tail packaging structure, wherein the tapered end of the transition piece is connected to the smooth aluminum sheath of the cable, and the tail tube of the cable accessory is connected to the other end of the transition piece. The cable accessory packaging structure includes:

[0005] a lead sealing layer, the lead sealing layer covering the outer periphery of the connection between the tail pipe and the transition piece;

[0006] an insulating layer, the insulating layer covering the outer periphery of the lead sealing layer;

[0007] A waterproof layer, the waterproof layer covering the connection between the smooth aluminum sheath and the transition piece and the insulating layer;

[0008] A heat shrink tube is coated on the outer periphery of the waterproof layer and is in contact with the outer peripheral wall of the tail pipe and the outer peripheral wall of the waterproof layer.

[0009] According to one embodiment of the present invention, in the axial direction of the cable, the length of the insulating layer is greater than the length of the lead sealing layer, and one end of the insulating layer is connected to the outer peripheral wall of the tail tube, and the other end is connected to the outer peripheral wall of the transition piece.

[0010] According to one embodiment of the present invention, the insulating layer includes at least two resin glue layers and at least one glass ribbon layer, and in the radial direction of the cable, the resin glue layers and the glass ribbon layers are alternately distributed.

[0011] According to one embodiment of the present invention, the cable further includes an outer protective sheath, which is placed outside the smooth aluminum sheath. In the axial direction of the cable, the length of the waterproof layer is greater than the length of the insulating layer, and one end of the waterproof layer is connected to the outer peripheral wall of the tail tube, and the other end is connected to the outer peripheral wall of the outer protective sheath.

[0012] According to one embodiment of the present invention, the end of the transition piece away from the smooth aluminum sheath is arranged in the tail tube, and the cable accessory tail packaging structure also includes lead foil, which is wrapped around the outer wall of the transition piece to form an isolation layer, and the end of the isolation layer facing the smooth aluminum sheath is flush with the end of the tail tube facing the smooth aluminum sheath.

[0013] The present invention also provides a cable accessory tail packaging method, which is applied to the cable accessory tail packaging structure described above. The cable accessory tail packaging method includes:

[0014] Insert the transition piece into the cable body, and weld the tapered end of the transition piece to the smooth aluminum sheath; insert the tail tube into the cable body, and connect the tail tube to the end of the transition piece away from the smooth aluminum sheath;

[0015] Performing lead sealing treatment at the connection between the transition piece and the tail pipe to seal the transition piece and the tail pipe;

[0016] Performing insulation treatment on the lead sealing area, thereby covering the outer periphery of the lead sealing area with an insulation layer;

[0017] Performing waterproofing treatment on the tail pipe and the smooth aluminum sheath, so that a waterproof layer is coated on the connection between the smooth aluminum sheath and the transition piece and on the outer periphery of the insulation layer;

[0018] A heat shrink tube is inserted into the outer periphery of the waterproof layer so that the heat shrink tube covers the waterproof layer.

[0019] According to one embodiment of the present invention, the insulating layer includes at least two resin glue layers and at least one glass ribbon layer, and in the radial direction of the cable, the resin glue layers and the glass ribbon layers are alternately distributed; the cable accessory tail packaging method further includes:

[0020] Coating resin glue on the outer periphery of the lead sealing layer, and wrapping a glass ribbon on the resin glue in a half-lap manner;

[0021] After the resin glue is solidified, the steps of coating the outer periphery of the lead sealing layer with resin glue and wrapping the glass ribbon with half overlap are repeated until the insulating layer with the required number of resin glue layers and glass ribbon layers is obtained.

[0022] According to one embodiment of the present invention, the cable accessory tail packaging method further includes:

[0023] Performing tinning treatment on the outer peripheral wall of the transition piece so that the outer periphery of the transition piece is covered with a tin layer;

[0024] Performing lead plating on the tin-plated area of ​​the transition piece so that the outer periphery of the transition piece is covered with a lead layer;

[0025] Performing tinning treatment on the outer peripheral wall of the tail pipe so that the outer periphery of the tail pipe is covered with a tin layer;

[0026] A lead sealing process is performed between the lead layer on the transition piece and the tin layer on the tail pipe to seal the transition piece and the tail pipe.

[0027] According to one embodiment of the present invention, the cable accessory tail packaging method further includes:

[0028] A lead-sealing process is performed at the connection between the transition piece and the tail pipe using a lead-touching method, so that the surface of the lead-sealing area is free of burrs and forms an apple-shaped ball, so that the transition piece and the tail pipe are sealed;

[0029] The lead sealing area is cooled with stearic acid, and the lead sealing area is insulated after the temperature of the lead sealing area is cooled to room temperature.

[0030] According to one embodiment of the present invention, the cable accessory tail packaging method further includes:

[0031] The connection between the transition piece and the tail pipe is sealed with lead by the lead contact method, and each continuous sealing operation time is less than or equal to 15 minutes. During each continuous sealing operation, the temperature of the tapered end is less than or equal to 120°C.

[0032] Compared with the prior art, the cable accessory tail packaging structure and packaging method according to the embodiment of the present invention have the following advantages:

[0033] The cable accessory tail packaging structure of an embodiment of the present invention provides an insulating layer around the lead-sealing area to insulate and seal the lead-sealing area on the transition piece and the tail tube. A waterproof layer is provided at the connection between the smooth aluminum sheath and the transition piece and around the insulating layer to seal the connection between the smooth aluminum sheath and the transition piece and the insulating layer, preventing water vapor from corroding the connection between the smooth aluminum sheath and the transition piece and the lead-sealing area. A heat shrink tubing is provided around the waterproof layer to prevent the waterproof layer from being directly exposed to the external environment. Thus, the insulating layer, waterproof layer, and heat shrink tubing provide a multi-layer sealing of the connection between the cable accessory's tail tube and the cable, improving the connection strength, reducing the impact of the external environment on the connection between the cable accessory and the cable, and lowering the probability of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is one of the schematic diagrams of the cable accessory tail packaging structure provided by an embodiment of the present invention.

[0035] Figure 2 This is the second schematic diagram of the cable accessory tail packaging structure provided by an embodiment of the present invention.

[0036] Figure 3 It is a schematic diagram of the connection between the transition piece and the smooth aluminum sheath provided by an embodiment of the present invention.

[0037] Figure 4 Schematic diagram of the positional relationship between the transition piece and the tail pipe provided in an embodiment of the present invention.

[0038] Reference numerals:

[0039] 110. Cable body; 111. Smooth aluminum sheath; 113. Flared section; 114. Outer protective sheath;

[0040] 120, transition piece; 121, tapered end;

[0041] 130. Lead sealing layer; 131. Insulation layer; 132. Waterproof layer; 133. Heat shrink tubing; 134. Isolation layer; 135. End sealing structure; 140. Tail pipe; A. First temperature measuring point; B. Second temperature measuring point. DETAILED DESCRIPTION

[0042] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0043] In the description of the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0044] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connect" should be understood in a broad sense. For ordinary technicians in this field, they can understand the specific meanings of the above terms in the embodiments of the present invention according to specific circumstances.

[0045] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0046] like Figure 1 As shown, a cable accessory tail packaging structure according to an embodiment of the present invention includes a tapered end 121 of a transition piece 120 connected to the smooth aluminum sheath 111 of the cable, and a tail tube 140 of the cable accessory connected to the other end of the transition piece 120. The cable accessory packaging structure includes a lead sealing layer 130, an insulating layer 131, a waterproof layer 132, and a heat shrink tubing 133.

[0047] Specifically, a lead sealing layer 130 is coated around the periphery of the connection between the tail pipe 140 and the transition piece 120, and an insulating layer 131 is coated around the periphery of the lead sealing layer 130 to insulate and seal the lead sealing areas on the tail pipe 140 and the transition piece 120. A waterproof layer 132 is coated around the connection between the smooth aluminum sheath 111 and the transition piece 120, as well as the insulating layer 131, to seal the connection between the smooth aluminum sheath 111 and the transition piece 120 and the insulating layer 131, ensuring waterproof performance in the lead sealing area and between the smooth aluminum sheath 111 and the transition piece 120. The waterproof layer 132 may be formed by wrapping waterproof insulating tape, which may be HB1514 PVC waterproof insulating tape. The heat shrink tube 133 is wrapped around the outer periphery of the waterproof layer 132 and fits the outer peripheral wall of the tail pipe 140 and the outer peripheral wall of the waterproof layer 132, preventing the waterproof layer 132 from directly contacting the external water vapor, protecting the waterproof layer 132, and extending the service life of the waterproof layer 132.

[0048] Thus, by providing an insulating layer 131 around the lead-sealed area, the lead-sealed area on the transition piece 120 and the tail tube 140 is insulated and sealed. By providing a waterproof layer 132 at the connection between the smooth aluminum sheath 111 and the transition piece 120 and around the insulating layer 131, the connection between the smooth aluminum sheath 111 and the transition piece 120 and the insulating layer 131 are sealed, preventing moisture from corroding the connection between the smooth aluminum sheath 111 and the transition piece 120 and the lead-sealed area. By providing a heat shrink tube 133 around the waterproof layer 132, the waterproof layer 132 is protected from direct exposure to the external environment. Thus, the insulating layer 131, waterproof layer 132, and heat shrink tube 133 provide a multi-layer seal at the connection between the cable accessory's tail tube 140 and the cable, improving the connection strength, reducing the impact of the external environment on the connection between the cable accessory and the cable, and lowering the probability of failure.

[0049] like Figure 1 As shown, according to some embodiments of the present invention, along the axial direction of the cable, the length of insulation layer 131 is greater than the length of lead sealing layer 130. One end of insulation layer 131 is connected to the outer circumferential wall of tail tube 140, and the other end is connected to the outer circumferential wall of transition piece 120, thereby sealing both ends of lead sealing layer 130 and improving the connection strength between tail tube 140 and transition piece 120. In some embodiments, insulation layer 131 includes at least two resin adhesive layers and at least one glass ribbon layer. The resin adhesive layers and glass ribbon layers are alternately distributed in the radial direction of the cable, with both the innermost and outermost layers being resin adhesive layers, which may be formed by coating with AB epoxy adhesive.

[0050] According to some embodiments of the present invention, the cable further includes an outer protective sheath 114, which is positioned over the smooth aluminum sheath 111 and conforms to the smooth aluminum sheath 111. Along the cable's axis, the waterproof layer 132 is longer than the insulating layer 131. One end of the waterproof layer 132 is connected to the outer circumferential wall of the tail tube 140, and the other end is connected to the outer circumferential wall of the outer protective sheath 114. This isolates the smooth aluminum sheath 111, transition piece 120, and lead sealing layer 130 from the external environment, reducing erosion by external moisture, wind, rain, and the like at the connection between the smooth aluminum sheath 111, transition piece 120, and tail tube 140.

[0051] According to some embodiments of the present invention, the end of transition piece 120 facing away from smooth aluminum sheath 111 is disposed within tail tube 140. The cable accessory tail encapsulation structure further includes lead foil wrapped around the outer circumference of transition piece 120, forming an isolation layer 134. The outer circumference of isolation layer 134 is in contact with the inner wall of tail tube 140. Tail tube 140 is sleeved onto transition piece 120 to connect with the latter, improving the stability of the connection. The isolation layer 134, disposed on the outer circumference of transition piece 120, blocks the gap between the two components, providing a secure connection, sealing, and electromagnetic shielding. The end of isolation layer 134 facing smooth aluminum sheath 111 is flush with the end of tail tube 140 facing the smooth aluminum sheath 111, facilitating lead sealing at the connection between tail tube 140 and transition piece 120.

[0052] A cable accessory tail packaging method according to an embodiment of the present invention is applied to the cable accessory tail packaging structure described above. The cable accessory tail packaging method includes:

[0053] S1: Insert the transition piece 120 into the cable body 110, and weld the tapered end 121 of the transition piece 120 to the smooth aluminum sheath 111. Figure 3 As shown, one end of the smooth aluminum sheath 111 is expanded to form a trumpet-shaped expanded section 113, and the tapered end 121 of the transition piece 120 is directed toward the smooth aluminum sheath 111. The transition piece 120 is placed on the cable body 110 until the outer wall of the tapered end 121 abuts against the end of the expanded section 113 and the tapered end 121 is partially embedded in the expanded section 113. The connection between the expanded section 113 and the tapered end 121 is then welded. During the welding process, in order to avoid scalding the cable body 110, at least one temperature measuring point should be provided on the smooth aluminum sheath 111 to monitor the temperature during the welding process. For example, Figure 1As shown, a first temperature measuring point A is set on the outer wall of the flared section 113 at the end away from the transition piece 120. There can be at least three first temperature measuring points A, spaced circumferentially around the smooth aluminum jacket 111. Second temperature measuring points B are set on the outer wall of the smooth aluminum jacket 111, spaced circumferentially around the side of the first temperature measuring point A away from the transition piece 120. There can be at least three second temperature measuring points B, spaced circumferentially around the smooth aluminum jacket 111. Along the axis of the smooth aluminum jacket 111, the distance between the first temperature measuring point A and the second temperature measuring point B is L4, with 30 mm ≤ L4 ≤ 60 mm. During welding, if the detected temperature is greater than or equal to 80°C, the welding operation is suspended until the detected temperature drops to 40°C, and then welding is resumed until all circumferential connections between the smooth aluminum jacket 111 and the transition piece 120 are completed. The weld surface must be free of defects such as pores, cracks, slag inclusions, and undercuts. In addition, during the welding process, a cooling device may be provided around the welding position to promptly remove the heat generated during the welding process. For example, a wet towel may be placed on the smooth aluminum sheath 111 .

[0054] S2: Insert the tail tube 140 into the cable body 110 and connect the tail tube 140 to the end of the transition piece 120 away from the smooth aluminum sheath 111. Figure 1 As shown, the diameter of the end of the transition piece 120 away from the smooth aluminum sheath 111 is smaller than the diameter of the tail pipe 140. The tail pipe 140 is sleeved over the end of the transition piece 120 away from the smooth aluminum sheath 111. Furthermore, lead foil is wrapped around the outer circumference of the portion of the transition piece 120 located within the tail pipe 140 to form an isolation layer 134 having an outer diameter slightly larger than the inner diameter of the tail pipe 140. The outer circumference of the isolation layer 134 is in contact with the inner wall of the tail pipe 140, thereby securing the tail pipe 140 to the transition piece 120.

[0055] S3: A lead sealing process is performed at the connection between the transition piece 120 and the tail pipe 140 to seal the transition piece 120 and the tail pipe 140. Specifically, a lead sealing process is performed at the connection between the transition piece 120 and the tail pipe 140 to form a lead sealing layer 130 connected to the tail pipe 140 and the transition piece 120, respectively, thereby sealing the transition piece 120 and the tail pipe 140.

[0056] S4: Performing insulation treatment on the lead-sealed area, thereby covering the outer periphery of the lead-sealed area with an insulation layer 131.

[0057] Specifically, the insulating layer 131 includes at least two resin adhesive layers and at least one glass ribbon layer, and in the radial direction of the cable, the resin adhesive layers and the glass ribbon layers are alternately distributed. The cable accessory tail packaging method also includes:

[0058] S41: Coat resin glue on the periphery of the lead sealing layer 130, and wrap glass ribbon on the resin glue in a half-lap manner. Coat AB epoxy glue on the lead sealing area to form a resin glue layer, such as Figure 2 As shown, in the axial direction of the cable, the length of the resin layer is greater than the length of the insulating layer 131, and the overlapping length of the resin layer and the tail tube 140 is L 21 , L 21 ≥20mm, the overlap length between the resin layer and the tail pipe 140 is L 22 , L 22 ≥20mm to seal both ends of the lead sealing layer 130 and stabilize the resin adhesive layer at the connection between the tail tube 140 and the cable. Next, a glass ribbon is wrapped around half of the outer circumference of the resin adhesive layer. Half the width of the second adjacent glass ribbon wraps overlays the first, forming a glass ribbon layer. Along the cable axis, the length of the glass ribbon layer is greater than the length of the inner resin adhesive layer.

[0059] S42: After the resin glue is solidified, step S41 is repeated until the insulation layer 131 having the required number of resin glue layers and glass ribbon layers is obtained, and the outermost layer of the insulation layer 131 is the resin glue layer.

[0060] S5: Waterproof the tail pipe 140 and the smooth aluminum sheath 111, so that the waterproof layer 132 is coated on the connection between the smooth aluminum sheath 111 and the transition piece 120 and on the periphery of the insulation layer 131. Specifically, the waterproof insulation tape is wrapped around the periphery of the insulation layer 131 in a semi-overlap manner, and half of the width of the latter two adjacent circles of waterproof insulation tape overlaps the former circle to form a waterproof layer 132. According to the protection requirements, the number of layers of the wrapped waterproof insulation tape can be at least two layers. For example, three layers of waterproof insulation tape can be wrapped in sequence. The waterproof layer 132 should also be coated on the connection between the smooth aluminum sheath 111 and the transition piece 120 to seal and waterproof the connection between the smooth aluminum sheath 111 and the transition piece 120. As Figure 2 As shown, the cable further includes an outer protective sheath 114, which is externally positioned over the smooth aluminum sheath 111 and in close contact with the smooth aluminum sheath 111. One end of the waterproof layer 132 is connected to the outer circumferential wall of the tail pipe 140, and the other end is connected to the outer circumferential wall of the outer protective sheath 114. The length of the portion where the waterproof layer 132 is connected to the outer circumferential wall of the outer protective sheath 114 is L3, and L3 is ≥ 100 mm to ensure the stability of the connection between the waterproof layer 132 and the cable.

[0061] S6: Insert the heat shrink tube 133 around the outer periphery of the waterproof layer 132 so that the heat shrink tube 133 covers the waterproof layer 132. Slide the heat shrink tube 133 over the waterproof layer 132, ensuring that the heat shrink tube 133 covers both ends of the waterproof layer 132, and that at least a portion of the heat shrink tube 133 is sheathed on the outer protective sleeve 114. For example, the length of the portion of the heat shrink tube 133 sheathed on the outer protective sleeve 114 is greater than or equal to 100 mm. Furthermore, the portion of the outer peripheral wall of the outer protective sleeve 114 corresponding to the heat shrink tube 133 should be polished using a #240 sanding belt. The surface should be polished to a rough surface, and the polishing length should be approximately 200 mm. Then, the polished surface of the outer protective sleeve 114 is cleaned and blown dry, the heat shrink tube 133 is moved to the corresponding position, and the heat shrink tube 133 is heated so that the heat shrink tube 133 shrinks and fits with the outer peripheral wall of the tail pipe 140, the outer peripheral wall of the waterproof layer 132 and the outer peripheral wall of the outer protective sleeve 114.

[0062] In this way, insulation treatment is performed on the lead-sealed area to form an insulating layer 131 that covers the lead-sealed area. Waterproofing treatment is performed on the tail pipe 140 and the smooth aluminum sheath 111, so that a waterproof layer 132 is coated on the connection between the smooth aluminum sheath 111 and the transition piece 120 and on the outer periphery of the insulating layer 131. This improves the insulation performance and sealing of the lead-sealed area. Furthermore, the insulating layer 131 and the waterproof layer 132 wrap around the lead-sealed area, improving the connection strength between the tail pipe 140 and the transition piece 120.

[0063] According to some embodiments of the present invention, the cable accessory tail packaging method further includes:

[0064] The outer wall of the transition piece 120 is tinned so that the outer wall of the transition piece 120 is covered with a tin layer. Figure 4 As shown, the outer peripheral wall of the transition piece 120 is tinned to form a tin layer on the outer peripheral wall of the transition piece 120. The length of the tin layer in the axial direction of the transition piece 120 is L. 51 ,160mm≤L 51 ≤170mm, wherein the tin layer extends from the side of the tapered end 121 close to the tail pipe 140 toward the tail pipe 140, with one end of the tin layer located inside the tail pipe 140. Before tinning the transition piece 120, use a file to thoroughly roughen the corresponding position on the outer surface of the transition piece 120 to remove the oxide layer; use a spray gun to heat the transition piece 120 in this range to a temperature slightly higher than the melting point of the tin solder to ensure that the tin soldering rod melts and adheres to the transition piece 120 when it contacts the transition piece 120; then, quickly apply the tin soldering rod directly to the transition piece 120, and repeat the above operation twice to form three uniform tin layers on the outer peripheral wall of the transition piece 120.

[0065] The tin-lined area of ​​the transition piece 120 is subjected to lead-line treatment so that the outer periphery of the transition piece 120 is covered with a lead layer. Figure 4 As shown, the tin-lined area on the transition piece 120 is lead-lined to form a lead layer on the outer peripheral wall of the transition piece 120. The length of the lead layer in the axial direction of the transition piece 120 is L. 52 ,130mm≤L 52 ≤140mm, wherein the lead layer extends from the side of the tapered end 121 near the tail tube 140 toward the tail tube 140, with one end of the lead layer located within the tail tube 140 to ensure that the lead sealing layer 130 formed by the lead sealing process contacts the lead layer on the transition piece 120. During the lead-enameling process on the transition piece 120, a spray gun is used to heat the tin-enameled transition piece 120 to a temperature slightly higher than the melting point of the lead solder. A lead solder rod is then quickly and forcefully applied to the transition piece 120 to form the lead layer. The lead layer thickness h is required to meet the requirement of 2mm≤h≤3mm, and the lead-enameling must be uniform and reliably bonded. It should be noted that during the tin-enameling and lead-enameling processes on the transition piece 120, heat dissipation measures should be implemented to prevent burns on the cable body 110, such as covering both ends of the transition piece 120 with wet towels for heat dissipation.

[0066] The outer wall of the tail pipe 140 is tinned, forming a tin layer. Specifically, the portion of the outer wall of the tail pipe 140 that requires lead sealing is tinned using solder wire to form a tin layer. Next, lead foil is wrapped around the transition piece 120, and the relative positions of the transition piece 120 and the tail pipe 140 are fixed. Finally, a lead sealing process is performed between the lead layer on the transition piece 120 and the tin layer on the tail pipe 140, sealing the transition piece 120 and the tail pipe 140.

[0067] According to some embodiments of the present invention, the cable accessory tail packaging method further includes:

[0068] The lead-touch method is used to seal the connection between the transition piece 120 and the tail pipe 140. The continuous lead-sealing operation time is less than or equal to 15 minutes each time, and the temperature of the transition piece 120 is less than or equal to 120°C during each continuous lead-sealing operation. Specifically, the lead-touch method is used to seal the connection between the transition piece 120 and the tail pipe 140 to form a lead-sealing layer 130. The area covered by the lead-sealing layer 130 is the lead-sealing area. The welding rod used is a lead-tin alloy made of 37% lead and 63% tin. The thickness of the lead-sealing layer 130 is required to be uniform in the circumferential direction. The thickness of the lead-sealing layer 130 is required to be not less than 12mm on one side. The shape should be smooth and symmetrical, and the surface of the lead-sealing layer 130 should be free of burrs. The lead-sealing layer 130 is formed into an apple ball shape to seal the transition piece 120 and the tail pipe 140. In addition, as Figure 2 As shown, in the axial direction of the cable, the width of the lead sealing area covering the tail tube 140 is L11 , 60mm≤L 11 ≤65mm, the width of the lead sealing area covering the transition piece is L 12 , 60mm≤L 12 ≤70mm. After the lead sealing operation is completed, the lead sealing area is immediately cooled with stearic acid. After the lead sealing area cools to room temperature, the lead sealing area is insulated. During the lead sealing process, a temperature measuring point can be set on the outer peripheral wall of the transition piece 120 near the tapered end 121 to monitor the temperature of the transition piece 120 and avoid damage to the cable body 110 during the lead sealing process.

[0069] To facilitate understanding of the present invention, an embodiment of the cable accessory tail packaging method of the present invention is provided below:

[0070] One end of the smooth aluminum sheath 111 is flared to form a trumpet-shaped flared section 113. The tapered end 121 of the transition piece 120 is oriented toward the smooth aluminum sheath 111. The transition piece 120 is then fitted over the cable body 110 until the outer wall of the tapered end 121 abuts against the end of the flared section 113 and the tapered end 121 partially embeds within the flared section 113. The connection between the flared section 113 and the tapered end 121 is then welded. During the welding process, the temperature of the smooth aluminum sheath 111 at the first and second temperature measurement points A and B is monitored to prevent excessive welding temperatures from damaging the cable body 110. Furthermore, a wet towel is placed around the welding location to dissipate the heat generated during the welding process.

[0071] Insert the tail tube 140 into the cable body 110 and onto the end of the transition piece 120 away from the smooth aluminum sheath 111. Then, use a file to thoroughly roughen the corresponding locations on the outer surface of the transition piece 120 to remove the oxide layer. Tin the outer wall of the transition piece 120. Use a spray gun to heat the transition piece 120 in this area to a temperature slightly higher than the melting point of the tin solder. Then quickly apply a tin solder rod to the transition piece 120 to form a tin layer on the outer wall of the transition piece 120. Then, apply a lead coating to the tinned area of ​​the transition piece 120. Use a spray gun to heat the tinned transition piece 120 to a temperature slightly higher than the melting point of the lead solder. Then, apply a lead solder rod to the transition piece 120 quickly and forcefully to form a lead layer on the outer wall of the transition piece 120. The outer wall of tail pipe 140 is tinned. The portion of the outer wall of tail pipe 140 that requires lead sealing is tinned with solder wire to form a tin layer. Next, lead foil is wrapped around the outer wall of the portion of transition piece 120 located within tail pipe 140 to form an isolation layer 134 with an outer diameter slightly larger than the inner diameter of tail pipe 140. The outer wall of isolation layer 134 is aligned with the inner wall of tail pipe 140, thereby securing the relative positions of transition piece 120 and tail pipe 140.

[0072] A lead-sealing method is used at the junction of the transition piece 120 and the tail pipe 140 to form a lead-sealing layer 130. The area covered by this layer 130 is the lead-sealing area. Each continuous sealing operation lasts for less than or equal to 15 minutes, and the temperature of the transition piece 120 is kept below 120°C during each continuous sealing operation. After the sealing operation is completed, the sealed area is immediately cooled using stearic acid. After the sealed area cools to room temperature, insulation treatment is performed on it.

[0073] The lead sealing area is insulated, and resin glue is applied to the outer periphery of the lead sealing layer 130. A glass ribbon is then wrapped around the resin glue in a half-lap manner. Specifically, AB epoxy glue is applied to the lead sealing area to form a resin glue layer. Thereafter, a glass ribbon is wrapped around the outer periphery of the resin glue layer in a half-lap manner to form a glass ribbon layer. Furthermore, in the axial direction of the cable, the length of the glass ribbon layer is greater than the length of the resin glue layer of the inner ring. After waiting for the resin glue to naturally cure, the above steps of applying resin glue and wrapping glass ribbon are repeated on the outer periphery of the glass ribbon layer until an insulation layer 131 having the desired number of resin glue layers and glass ribbon layers is obtained, with the outermost layer of the insulation layer 131 being the resin glue layer.

[0074] A waterproof insulating tape is wrapped around the outer periphery of the insulating layer 131 in a semi-overlap manner to form a waterproof layer 132. One end of the waterproof layer 132 is connected to the outer peripheral wall of the tail tube 140, and the other end is connected to the outer peripheral wall of the outer protective sleeve 114. The length of the portion where the waterproof layer 132 is connected to the outer peripheral wall of the outer protective sleeve 114 is L3, and L3 ≥ 100mm to ensure the stability of the connection between the waterproof layer 132 and the cable. Afterwards, a heat shrink tube 133 is inserted into the outer periphery of the waterproof layer 132, ensuring that the heat shrink tube 133 covers both ends of the waterproof layer 132, and at least a portion of the heat shrink tube 133 is inserted into the outer protective sleeve 114. The heat shrink tube 133 is heated to shrink the heat shrink tube 133 and adhere to the outer peripheral wall of the tail tube 140, the outer peripheral wall of the waterproof layer 132, and the outer peripheral wall of the outer protective sleeve 114. Finally, at least two layers of waterproof insulating tape and at least two layers of insulating tape are half-overlapped around the two ends of the shrunk heat shrink tube 133, and at least two layers of black PVC adhesive tape are half-overlapped around the outside of the insulating tape to form an end sealing structure 135, thereby sealing the ends of the heat shrink tube 133.

[0075] In summary, the embodiments of the present invention provide a cable accessory tail packaging structure and packaging method. The structure provides an insulating layer 131 around the lead-sealing area to insulate and seal the lead-sealing area on the transition piece 120 and the tail tube 140. A waterproof layer 132 is provided at the connection between the smooth aluminum sheath 111 and the transition piece 120 and around the insulating layer 131 to seal the connection between the smooth aluminum sheath 111 and the transition piece 120 and the insulating layer 131, thereby preventing water vapor from corroding the connection between the smooth aluminum sheath 111 and the transition piece 120 and the lead-sealing area. A heat shrink tube 133 is provided around the waterproof layer 132 to prevent the waterproof layer 132 from being directly exposed to the external environment. Thus, the insulating layer 131, the waterproof layer 132, and the heat shrink tube 133 provide a multi-layer sealing of the connection between the cable accessory's tail tube 140 and the cable, thereby improving the connection strength, reducing the impact of the external environment on the connection between the cable accessory and the cable, and reducing the probability of failure.

[0076] Finally, it should be noted that the above embodiments are intended only to illustrate the present invention and are not intended to limit the present invention. It should be noted that those skilled in the art may make several improvements and substitutions without departing from the technical principles of the present invention, and such improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A cable accessory tail packaging structure, wherein the tapered end of the transition piece is connected to the smooth aluminum sheath of the cable, and the tail tube of the cable accessory is connected to the other end of the transition piece, characterized in that: The cable accessories packaging structure includes: a lead sealing layer, the lead sealing layer covering the outer periphery of the connection between the tail pipe and the transition piece; an insulating layer, the insulating layer covering the outer periphery of the lead sealing layer; A waterproof layer, the waterproof layer covering the connection between the smooth aluminum sheath and the transition piece and the insulating layer; A heat shrink tube is coated on the outer periphery of the waterproof layer and is in contact with the outer peripheral wall of the tail pipe and the outer peripheral wall of the waterproof layer.

2. The cable accessory tail packaging structure according to claim 1, characterized in that: In the axial direction of the cable, the length of the insulating layer is greater than that of the lead sealing layer, and one end of the insulating layer is connected to the outer peripheral wall of the tail tube, and the other end is connected to the outer peripheral wall of the transition piece.

3. The cable accessory tail packaging structure according to claim 1, characterized in that: The insulating layer includes at least two resin glue layers and at least one glass ribbon layer, and in the radial direction of the cable, the resin glue layers and the glass ribbon layers are alternately distributed.

4. The cable accessory tail packaging structure according to claim 1, characterized in that: The cable also includes an outer protective sheath, which is placed outside the smooth aluminum sheath. In the axial direction of the cable, the length of the waterproof layer is greater than the length of the insulating layer, and one end of the waterproof layer is connected to the outer peripheral wall of the tail tube, and the other end is connected to the outer peripheral wall of the outer protective sheath.

5. The cable accessory tail packaging structure according to claim 1, characterized in that: The end of the transition piece away from the smooth aluminum sheath is arranged in the tail tube, and the cable accessory tail packaging structure also includes lead foil, which is wrapped around the outer wall of the transition piece to form an isolation layer. The end of the isolation layer facing the smooth aluminum sheath is flush with the end of the tail tube facing the smooth aluminum sheath.

6. A cable accessory tail packaging method, applied to the cable accessory tail packaging structure according to any one of claims 1 to 5, characterized in that: Cable accessory tail packaging methods include: Insert the transition piece into the cable body and weld the tapered end of the transition piece to the smooth aluminum sheath; Inserting the tail tube into the cable body and connecting the tail tube to the end of the transition piece away from the smooth aluminum sheath; Performing lead sealing treatment at the connection between the transition piece and the tail pipe to seal the transition piece and the tail pipe; Performing insulation treatment on the lead sealing area, thereby covering the outer periphery of the lead sealing area with an insulation layer; Performing waterproofing treatment on the tail pipe and the smooth aluminum sheath, so that a waterproof layer is coated on the connection between the smooth aluminum sheath and the transition piece and on the outer periphery of the insulation layer; A heat shrink tube is inserted into the outer periphery of the waterproof layer so that the heat shrink tube covers the waterproof layer.

7. The cable accessory tail packaging method according to claim 6, characterized in that: The insulating layer includes at least two resin glue layers and at least one glass ribbon layer, and in the radial direction of the cable, the resin glue layers and the glass ribbon layers are alternately distributed; The cable accessory tail packaging method further includes: Coating resin glue on the outer periphery of the lead sealing layer, and wrapping a glass ribbon on the resin glue in a half-lap manner; After the resin glue is solidified, the steps of coating the outer periphery of the lead sealing layer with resin glue and wrapping the glass ribbon with half overlap are repeated until the insulating layer with the required number of resin glue layers and glass ribbon layers is obtained.

8. The cable accessory tail packaging method according to claim 6, characterized in that: The cable accessory tail packaging method further includes: Performing tinning treatment on the outer peripheral wall of the transition piece so that the outer periphery of the transition piece is covered with a tin layer; Performing lead plating on the tin-plated area of ​​the transition piece so that the outer periphery of the transition piece is covered with a lead layer; Performing tinning treatment on the outer peripheral wall of the tail pipe so that the outer periphery of the tail pipe is covered with a tin layer; A lead sealing process is performed between the lead layer on the transition piece and the tin layer on the tail pipe to seal the transition piece and the tail pipe.

9. The cable accessory tail packaging method according to claim 6, characterized in that: The cable accessory tail packaging method further includes: A lead-sealing process is performed at the connection between the transition piece and the tail pipe using a lead-touching method, so that the surface of the lead-sealing area is free of burrs and forms an apple-shaped ball, so that the transition piece and the tail pipe are sealed; The lead sealing area is cooled with stearic acid, and the lead sealing area is insulated after the temperature of the lead sealing area is cooled to room temperature.

10. The cable accessory tail packaging method according to claim 9, characterized in that: The cable accessory tail packaging method further includes: The connection between the transition piece and the tail pipe is sealed with lead by the lead contact method, and each continuous sealing operation time is less than or equal to 15 minutes. During each continuous sealing operation, the temperature of the tapered end is less than or equal to 120°C.

Images