A longitudinal waterproof cable and production process

Abstract

The invention discloses a longitudinal waterproof cable and a production process, and relates to the technical field of cables. The longitudinal waterproof cable comprises a cable body, the cable body comprises a cable core, a tape layer is arranged on the outside of the cable core, a water-blocking powder is filled in the gap between the tape layer and the cable core, an inner lining layer is arranged on the outside of the tape layer, an aluminum-plastic composite tape is arranged on the outside of the inner lining layer, an outer sheath is arranged on the outside of the aluminum-plastic composite tape, an outer sheath is arranged on the outside of the outer sheath, a sealing component is arranged at the end of the outer sheath, the sealing component is used to achieve the end sealing of the cable body, a protective component is arranged on the outer sheath, the protective component is used to protect the outer sheath, and the sealing component cooperates with the protective component to seal the connection between two adjacent cable bodies. The invention can provide effective protection for the outer sheath of the cable, delay corrosion and aging, and effectively improve the waterproof effect of the cable end to prevent moisture from invading from the cable end.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to a longitudinal waterproof cable and a production process. Background Art

[0002] The rubber-plastic layer, an important component of the cable, will experience water tree aging in a humid environment, resulting in reduced insulation performance or signal distortion. Water tree aging has become one of the main reasons for the breakdown of the cable insulation layer, posing a serious threat to the safe operation of the cable. Therefore, effective measures need to be taken to prevent and control the occurrence and development of water tree aging during the manufacture, installation and operation of the cable.

[0003] A Chinese patent with application number 2024102146552 discloses a longitudinal waterproof cable for an underwater robot, which includes a power conductor, a control conductor, a waterproof filling material, a metal shielding layer, an inner sheath, a reinforcement layer and an outer sheath; the power conductor, the control conductor and the waterproof filling material are twisted to form a cable core; there are at least 2 power conductors and at least 1 group of 2 control conductors; the waterproof filling material completely fills the gaps in the cable core; the surface of the cable core is a metal shielding layer; the outside of the cable core is an inner sheath, a reinforcement layer is arranged outside the inner sheath, and an outer sheath is arranged outside the reinforcement layer; a waterproof layer is arranged outside the metal shielding layer, the inner sheath and the reinforcement layer.

[0004] However, various impurities attached to the outside of the cable will accelerate the water tree aging and corrosion of the cable outer sheath by combining with water and under sunlight. In addition, the cable joint is the weak link in the cable line, which is prone to water intrusion and water tree aging due to poor sealing or improper installation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a longitudinal waterproof cable and production process, which can provide effective protection for the cable outer sheath, delay corrosion and aging, and effectively improve the waterproof effect of the cable end to prevent moisture from invading from the cable end, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a longitudinal waterproof cable, comprising a cable body, the cable body comprising a cable core, a tape layer is provided on the outside of the cable core, a gap between the tape layer and the cable core is filled with water-blocking powder, an inner lining layer is provided on the outside of the tape layer, an aluminum-plastic composite tape is provided on the outside of the inner lining layer, an outer sheath is provided on the outside of the aluminum-plastic composite tape, and an outer sheath is provided on the outside of the outer sheath;

[0007] A sealing component is provided at the end of the outer sheath, and the sealing component is used to achieve end sealing of the cable body. A protective component is provided on the outer sheath, and the protective component is used to protect the outer sheath. The sealing component and the protective component cooperate to seal the connection between two adjacent cable bodies.

[0008] Preferably, the sealing assembly comprises a sealing gasket, which is arranged at the end of the cable body, the sealing gasket is sleeved with the cable core, the sealing gasket is a hollow structure, and the maximum diameter of the sealing gasket is the same as that of the outer sheath.

[0009] Preferably, a sealing cover is provided at the end of the outer sheath, and the end of the sealing cover is provided on the cable core. The inner diameter of the sealing cover is the same as the diameter of the outer sheath. A limiting groove with an annular structure is provided at the inner wall end of the sealing cover. A limiting ring is fitted in the limiting groove. A sealing ring is provided at the end of the limiting ring. The diameter of the sealing ring is the same as that of the sealing cover.

[0010] Preferably, an annular groove is provided on the inner end face of the sealing cover, a sealing ring is provided on the end face of the sealing gasket, the sealing ring corresponds to the annular groove, a telescopic tube is provided on the outer end face of the sealing cover, a docking ring is provided at the end of the telescopic tube, and a water immersion sensor is provided inside the telescopic tube.

[0011] Preferably, an inflation tube is provided on the side of the sealing cushion, and the inflation tube sequentially passes through the sealing cover and the telescopic tube to be connected to an external air supply system, and a solenoid valve is provided at one end of the inflation tube close to the air supply system.

[0012] Preferably, the protective component includes air guide holes and an annular seat, the air guide holes are opened in an annular array on the end surface of the outer sheath and penetrate the outer sheath, the annular seat is sleeved on the outer sheath in a linear array, and the cross-section of the annular seat is a "]"-shaped structure.

[0013] Preferably, a mounting seat with an annular structure is provided on the inner side of the annular seat, an arc-shaped groove is opened on the side of the mounting seat, a bellows is provided on the side of the mounting seat, a hollow structure is formed between the inner and outer walls of the bellows, and the hollow part of the bellows is connected to the arc-shaped groove accordingly.

[0014] Preferably, a magnetic ring is provided at the end of the bellows, an annular plate is provided on the inner wall of the magnetic ring, the annular plate is made of elastic material, and the inner wall of the annular plate is in contact with the circumferential surface of the outer sheath;

[0015] An air inlet pipe is provided through the bottom of the annular seat, and one end of the air inlet pipe passes through the circumferential surface of the outer sheath and is connected with the air guide hole. An electric control valve is provided at one end of the air inlet pipe located inside the annular seat, and a metal plate is provided at the closed end of the annular seat.

[0016] Preferably, a telescopic rod is provided on the inner wall of the annular seat, the telescopic rod corresponds to the hollow portion of the bellows, a pressure sensor is provided at the end of the telescopic rod, and a limit spring is sleeved on the telescopic rod.

[0017] The present invention also provides a production process for a longitudinal waterproof cable, wherein the production process is used to produce the longitudinal waterproof cable as described above, and comprises the following steps:

[0018] S1. Drawing the metal material used to make the cable core into a wire of a required diameter through a wire drawing machine, and annealing the wire after drawing;

[0019] S2. Use an extruder to extrude the insulating material (cross-linked polyethylene) and wrap it around the conductor to form an insulating layer. The conductor and the insulating layer together form a cable core, and multiple cable cores are twisted according to rules;

[0020] S3, using a wrapping machine to wrap the tape layer on the outside of the cable core, and using a filling device to evenly fill the water-blocking powder between the tape layer and the cable core, and using an extruder to wrap the lining layer on the outside of the tape layer;

[0021] S4, after the aluminum-plastic composite tape blank is released through the guide wheel, it is sequentially coated on the outside of the inner lining layer through three stainless steel tapered forming dies, the overlapping joints of the two edges of the aluminum-plastic composite tape blank are heated, and the longitudinal edges on both sides of the aluminum-plastic composite tape blank are fused together to achieve the coating molding of the aluminum-plastic composite tape blank on the cable semi-finished product;

[0022] S5, pulling the semi-finished cable coated with the aluminum-plastic composite tape into a sizing die with a heating function, and shaping the aluminum-plastic composite tape through extrusion in the sizing die;

[0023] S6. By installing an extruder after the longitudinal wrapping machine, the semi-finished cable after longitudinal wrapping is introduced into the extruder. The extrusion head extrude a dense plastic protective layer to form an outer sheath that is tightly combined with the surface of the heated aluminum-plastic composite tape to achieve the molding of the cable body.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. After the sealing cover is sleeved and fixed on the end of the cable body, the air supply system is used to inflate the sealing gasket. After the sealing gasket expands, it tightly contacts and fits with the inside of the sealing cover and the end of the cable body, sealing the end face of the cable body. At the same time, the annular groove and the sealing ring contact to improve the sealing effect of the cable core. After the two cable bodies are butt-jointed, the telescopic tube at the opposite end is extended and butt-jointed to seal the connection between the two adjacent cable bodies.

[0026] 2. The present invention closes both ends of the air guide hole and puts the air guide hole in a negative pressure state, that is, the bellows is in a contracted state, so that the pressure value of the pressure sensor reaches a preset threshold value. After the outer sheath corrodes, ages or cracks, causing the air guide hole to be connected to the outside, the bellows is released, and the force on the pressure sensor is reduced to less than the normal threshold value. It is determined that the outer sheath is corroded, aged or cracked, and the staff is reminded to perform maintenance in time.

[0027] 3. In the present invention, on rainy and snowy days, the bellows is stretched by inflating air into the bellows, and at the same time, the magnetic ring at the end of the bellows is close to the metal plate on the adjacent protective component. Under the action of the magnetic attraction of the magnetic ring, the magnetic ring is adsorbed on the metal plate, and the overall wrapping of the outer sheath can be achieved by stretching the bellows on each protective component to prevent rain and snow from adhering.

[0028] 4. When the seal at the end connection of the cable body fails in the present invention, in rainy and snowy days, after each bellows completes wrapping the cable body, all electric control valves except the two opposite ends of the cable bodies are closed, and air is continuously supplied to the bellows on both sides of the connection and the bellows continue to extend, so that the magnetic rings on both sides of the connection are attracted and docked, thereby achieving further sealing protection for the connection and the end between the two cable bodies and preventing rain and snow from penetrating into the interior of the cable body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the internal structure of the cable body of the present invention;

[0030] Figure 2 It is a schematic diagram of the shaft side structure of the present invention;

[0031] Figure 3 It is a structural schematic diagram of another angle of the present invention;

[0032] Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention;

[0033] Figure 5 For the present invention Figure 4 The enlarged structural diagram at A in the middle;

[0034] Figure 6 This is a schematic diagram of the structure of the sealing assembly of the present invention;

[0035] Figure 7 This is a schematic diagram of the cable body connection of the present invention.

[0036] In the figure: 1. cable body; 101. cable core; 102. tape layer; 103. lining layer; 104. aluminum-plastic composite tape; 105. outer sheath; 2. sealing assembly; 201. sealing pad; 202. sealing cover; 203. limiting groove; 204. limiting ring; 205. sealing ring; 206. annular groove; 207. sealing ring; 208. telescopic tube; 209. docking ring; 210. water immersion sensor; 211. inflation tube; 3. protection assembly; 301. air guide hole; 302. annular seat; 303. mounting seat; 304. arc groove; 305. bellows; 306. magnetic ring; 307. annular plate; 308. air inlet pipe; 309. metal plate; 310. telescopic rod; 311. pressure sensor; 312. limiting spring. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1

[0039] See also Figure 1 The present invention provides a longitudinal waterproof cable, including a cable body 1, wherein the cable body 1 includes a cable core 101, and a tape layer 102 is arranged on the outside of the cable core 101, and the tape layer 102 can be tightly wound around the periphery of the cable core 101 to fix the internal structure of the cable body 1, prevent the cable core 101 and the wire from shifting, and help maintain the roundness and stability of the cable body 1, and ensure that the cable body 1 will not be affected by the looseness of the internal structure during use. The material of the tape layer 102 is fire-proof and fire-proof and insulating material, which is conducive to improving the fire retardant effect of the cable body 1, and the gap between the tape layer 102 and the cable core 101 is filled with water-blocking powder. When water penetrates into the cable, the water-blocking powder can quickly absorb water and expand to form The tape layer 102 is provided with an inner lining layer 103 on the outside to prevent the internal structure from being mechanically damaged, such as being affected by external factors such as collision and vibration, to ensure that the internal structure of the cable body 1 will not be exposed or damaged during long-term operation. The inner lining layer 103 is provided with an aluminum-plastic composite tape 104 on the outside to effectively protect the cable body 1 from external physical damage and chemical corrosion. The aluminum foil layer can isolate oxygen and moisture to achieve an anti-corrosion effect, thereby further protecting the cable. The aluminum-plastic composite tape 104 is provided with an outer sheath 105 on the outside to protect the aluminum-plastic composite tape 104 and other internal cable layers.

[0040] The present invention also provides a production process for a longitudinal waterproof cable, the production process is used to produce the longitudinal waterproof cable as above, comprising the following steps:

[0041] S1. The metal material used to make the cable core is drawn into a wire of the required diameter through a wire drawing machine, and the wire after drawing is annealed to improve the toughness of the wire and reduce the strength to ensure that it meets the requirements of the cable for the conductive core;

[0042] S2. Use an extruder to extrude the insulating material (cross-linked polyethylene) and wrap it around the conductor to form an insulating layer. The conductor and the insulating layer together form a cable core 101. Twisting multiple cable cores 101 according to a certain rule;

[0043] S3, using a wrapping machine to wrap the tape layer 102 on the outside of the cable core 101, and using a filling device to evenly fill the water-blocking powder between the tape layer 102 and the cable core 101, and using an extruder to wrap the lining layer 103 on the outside of the tape layer 102;

[0044] S4, after the aluminum-plastic composite belt 104 blank is released through the guide wheel, it passes through three stainless steel tapered forming dies in sequence to be coated on the outside of the inner lining layer 103, the overlapping joints of the two edges of the aluminum-plastic composite belt 104 blank are heated, and the longitudinal edges on both sides of the aluminum-plastic composite belt 104 blank are fused together to form a stable tubular structure, thereby realizing the molding of the aluminum-plastic composite belt 104 blank;

[0045] S5, the formed aluminum-plastic composite strip 104 is pulled into a sizing die with a heating function, and the aluminum-plastic composite strip 104 is shaped after being extruded in the sizing die;

[0046] S6. The longitudinally wrapped cable core is introduced into an extruder, and the extruder extrudes a dense plastic protective layer to form an outer sheath 105. Due to preheating, the PET film on the surface of the aluminum-plastic composite tape 104 is tightly combined with the outer sheath 105 to prevent moisture and water from entering.

[0047] Embodiment 2

[0048] See also Figure 1-7 Based on the longitudinal waterproof cable of the first embodiment, during use, especially in rainy and snowy days, rain and snow will accelerate the corrosion and aging of the outer sheath 105. In addition, rain and snow water will invade the end connection between two adjacent cables and then penetrate into the interior of the cable body 1, accelerating the aging of water trees. In order to solve the above problems, the following improvements are made:

[0049] A sealing component 2 is provided at the end of the outer sheath 105, and the sealing component 2 is used to achieve the end sealing of the cable body 1. The sealing component 2 includes a sealing gasket 201, which is provided at the end of the cable body 1. The sealing gasket 201 is sleeved with the cable core 101. The sealing gasket 201 is a hollow structure, and the maximum diameter of the sealing gasket 201 is the same as that of the outer sheath 105. The sealing gasket 201 is preferably made of rubber. The hollow structure allows the sealing gasket 201 to expand when inflated.

[0050] A sealing cover 202 is sleeved on the end of the outer sheath 105, and the sealing cover 202 is preferably made of rubber material. The end of the sealing cover 202 is sleeved on the cable core 101, and the inner diameter of the sealing cover 202 is the same as the diameter of the outer sheath 105, that is, after the sealing cover 202 is sleeved on the outer sheath 105, it fits tightly with the circumferential surface of the outer sheath 105 and the sealing gasket 201, and a limiting groove 203 of an annular structure is opened on the inner wall end of the sealing cover 202, and a limiting ring 204 is matched in the limiting groove 203. A sealing ring 205 is provided at the end of the limiting ring 204. The limiting ring 204 and the sealing ring 205 are made of metal, and the limiting ring 204 and the limiting groove 203 are interference fit, and the diameter of the sealing ring 205 is the same as that of the sealing cover 202.

[0051] An annular groove 206 is provided on the inner end face of the sealing cover 202, and a sealing ring 207 is provided on the end face of the sealing gasket 201. The sealing ring 207 is located outside the cable core 101, and the sealing ring 207 corresponds to the annular groove 206. After the sealing cover 202 is completely sleeved on the end of the cable body 1, the sealing ring 207 and the annular groove 206 are plugged into and matched with each other to improve the sealing effect. The sealing ring 207 is preferably made of rubber. A telescopic tube 208 is provided on the outer end face of the sealing cover 202. The telescopic tube 208 can shield the cable core 101 exposed to the outside after being extended, and a docking ring 209 is provided on the end of the telescopic tube 208.

[0052] An inflation tube 211 is provided on the side of the sealing gasket 201, and the inflation tube 211 passes through the sealing cover 202 and the telescopic tube 208 in sequence and is connected to an external air supply system. The air supply system is preferably an air pump air supply system. An electromagnetic valve is provided at one end of the inflation tube 211 close to the air supply system. After the electromagnetic valve is opened, the external air supply system inflates air into the sealing gasket 201 through the inflation tube 211, so that the sealing gasket 201 expands, and the sealing gasket 201 contacts the inner wall of the sealing cover 202, thereby improving the sealing performance.

[0053] When in use, first, the limiting ring 204 that has been cryogenically frozen is sleeved on the outside of the outer sheath 105, the sealing gasket 201 is sleeved on the cable core 101 at the end of the cable body 1 and slid until it fits with the end face of the cable body 1, and the various protective layers inside the cable body 1 are sealed, and then the sealing cover 202 is sleeved on the end of the cable body 1, and the sealing cover 202 is also sleeved on the end of the cable core 101, and the sealing cover 202 is slid toward the sealing gasket 201 until it fits with the end face of the sealing gasket 201, and then the limiting ring 204 in the low temperature state is slid into the limiting groove 203. Affected by thermal expansion and contraction, the limiting ring 204 gradually expands in volume during the process of returning to normal temperature, so that the limiting ring 204 is tightly fitted with the inner wall of the limiting groove 203 and the circumferential surface of the outer sheath 105, thereby fixing the sealing cover 202 and sealing the end of the sealing cover 202.

[0054] Secondly, air is inflated into the sealing gasket 201 through the inflation tube 211. After the inflation is completed, the external solenoid valve is closed, and the sealing gasket 201 is in an expanded state. The expanded end face and circumferential surface of the sealing gasket 201 are tightly fitted with the inner end face and inner wall of the sealing cover 202 respectively, and at the same time, they are tightly fitted with the various protective layers at the end of the cable body 1 to achieve sealing of the end face of the cable body 1. At this time, the annular groove 206 and the sealing ring 207 are in close contact with each other, thereby improving the sealing effect of the cable core 101. After the two adjacent cable bodies 1 are butt-jointed, the telescopic tubes 208 at the opposite ends of the two adjacent cable bodies 1 are extended, and the butt-jointing rings 209 on both sides are butt-jointed, so that the connection between the two adjacent cable bodies 1 can be sealed.

[0055] In addition, during use, especially when the cable body 1 is exposed to the outside, impurities will adhere to the outer sheath 105, and the corrosion and aging of the outer sheath 105 will be accelerated under the action of rain, snow and sunlight for a long time, and it is difficult to detect in time, which will cause serious impact on power. Therefore, the following improvements are made:

[0056] A protective component 3 is sleeved on the outer sheath 105, and the protective component 3 is used to protect the outer sheath 105. The protective component 3 includes air guide holes 301 and an annular seat 302. The air guide holes 301 are opened in an annular array on the end surface of the outer sheath 105 and penetrate the outer sheath 105. A sealing tube inserted into the air guide holes 301 is provided on the inner side of the sealing gasket 201. An electric valve is provided on the sealing tube. In the initial state, the electric valve is closed, so that the two ends of the air guide holes 301 are in a closed state, and the inside of the air guide holes 301 is negative pressure.

[0057] The annular seat 302 is sleeved on the outer sleeve 105 in a linear array. The cross-section of the annular seat 302 is a "]"-shaped structure, that is, one side is transparent and the other side is closed. A mounting seat 303 with an annular structure is provided on the inner side of the annular seat 302. An arc groove 304 is opened on the side of the mounting seat 303. A bellows 305 is provided on the side of the mounting seat 303. The inner and outer walls of the bellows 305 are hollow structures, and the hollow part of the bellows 305 is correspondingly connected to the arc groove 304. An air inlet pipe 308 is penetrated through the bottom of the annular seat 302, and one end of the outer side of the air inlet pipe 308 penetrates the circumferential surface of the outer sleeve 105 and is connected to the air guide hole 301.

[0058] A metal plate 309 is provided at the closed end of the annular seat 302, and a magnetic ring 306 is provided at the end of the bellows 305. The magnetic ring 306 corresponds to the metal plate 309 on the adjacent annular seat 302. An annular plate 307 is provided on the inner wall of the magnetic ring 306. The annular plate 307 is made of elastic material, and the inner wall of the annular plate 307 is in contact with the circumferential surface of the outer sheath 105.

[0059] A telescopic rod 310 is provided on the inner wall of the annular seat 302, and the telescopic rod 310 corresponds to the hollow part of the bellows 305. A pressure sensor 311 is provided at the end of the telescopic rod 310, and a limit spring 312 is sleeved on the telescopic rod 310. When the inside of the air guide hole 301 is under negative pressure, the bellows 305 is in a negative pressure contraction state through the air inlet pipe 308. At this time, the inner end face of the bellows 305 contacts the pressure sensor 311, and the pressure value of the pressure sensor 311 is the threshold value under normal conditions.

[0060] An electric control valve is provided at one end of the air inlet pipe 308 located inside the annular seat 302 , and the electric control valve is used to control the on and off of the air inlet pipe 308 .

[0061] When in use, the electric control valve is opened and both ends of the air guide hole 301 are closed, and the air in the air guide hole 301 is evacuated to a negative pressure state, so that the bellows 305 contracts, and the pressure threshold of the pressure sensor 311 reaches a preset normal threshold range. After the outer sheath 105 corrodes and ages, causing the air guide hole 301 to be connected to the outside, the negative pressure state in the air guide hole 301 is gradually relieved, the contracted bellows 305 is released, and the force on the pressure sensor 311 is reduced. When the pressure value of the pressure sensor 311 is less than the normal threshold, it is actively determined that the outer sheath 105 has corroded and aged, and the staff is reminded to perform maintenance.

[0062] During the use of the cable body 1, in order to keep the surface of the outer sheath 105 clean, it is necessary to clean it regularly. During cleaning, the electric valve at one end of the cable body 1 is opened, the solenoid valve is opened, and the sealing gasket 201 is intermittently inflated by the external air supply system. Intermittent ventilation is achieved between the inner end faces of the mounting seat 303 and the annular seat 302 through the air guide hole 301, so that the bellows 305 with a hollow structure can reciprocate and expand, and the magnetic ring 306 drives the annular plate 307 to reciprocate and expand. During the reciprocating movement of the annular plate 307, impurities on the outer sheath 105 are cleaned. After cleaning, the external air supply system is switched to a vacuum state, so that the bellows 305 contracts to restore the negative pressure until the force applied to the pressure sensor 311 returns to a normal threshold value, and then the electric valve is closed to close both ends of the air guide hole 301 to maintain the negative pressure in the bellows 305. Then, the air supply system is used to inflate the sealing gasket 201 to restore it to the original sealing state, and then the solenoid valve is closed.

[0063] On rainy and snowy days, in order to prevent rain and snow from adhering to the surface of the outer sheath 105, the solenoid valve is opened, and the external air supply system is used to inflate the bellows 305 through the sealing gasket 201 and the air guide hole 301, so that the bellows 305 is in an extended state. When the bellows 305 is extended, the magnetic ring 306 at the end of the bellows 305 approaches the metal plate 309 on the adjacent protective component 3. Under the action of the magnetic attraction force, the magnetic ring 306 is adsorbed on the metal plate 309, so that the bellows 305 on each protective component 3 wraps the outer sheath 105, preventing rain and snow from falling on the outer sheath 105 and delaying corrosion and aging. After the rainy and snowy weather ends, the air supply system is evacuated to retract the bellows 305, so that the bellows 305 returns to the contracted state, and the sealing gasket 201 returns to the sealed state.

[0064] In addition, after long-term use, the telescopic tube 208 at the connection between two adjacent cable bodies 1 may be damaged, affecting the sealing of the joints of the telescopic tubes 208 on both sides. In order to solve the above problem:

[0065] The sealing component 2 and the protection component 3 cooperate to seal the connection between two adjacent cable bodies 1, and the magnetic poles of the magnetic rings 306 on the two adjacent cable bodies 1 are opposite.

[0066] A water sensor 210 is provided in the telescopic tube 208 , and the water sensor 210 is used to detect whether water is immersed in the telescopic tube 208 .

[0067] When the water sensor 210 detects that there is water in the telescopic tube 208, it is actively determined that the seal of the telescopic tube 208 has failed. At this time, in rainy and snowy days, after each bellows 305 has completed wrapping the cable body 1, each electric control valve except the opposite end of the two cable bodies 1 is closed, and the air supply system is used to supply air to the bellows 305 on both sides of the cable connection separately, so that the bellows 305 on both sides continue to extend. At this time, the annular plate 307 uses its own flexibility to pass through the sealing ring 205 and the sealing cover in turn. When the cable ends 202 reach the docking ring 209, the magnetic ring 306 and the annular plate 307 on the inner wall are in a stepped shape. At this time, the docking ring 209 and the annular plate 307 on the same side are in contact with each other, and the magnetic rings 306 on both sides of the cable connection are attracted to each other under the action of magnetic attraction, thereby ensuring the sealing of the docking of the bellows 305 on both sides. The bellows 305 that are attracted to each other on both sides can be used to achieve sealing protection of the end connection between the two cable bodies 1, thereby preventing rain and snow from penetrating into the interior of the cable body 1 and accelerating the aging of water trees.

[0068] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A longitudinal waterproof cable, comprising a cable body (1), characterized in that: The cable body (1) comprises a cable core (101), a tape layer (102) is provided on the outside of the cable core (101), a gap between the tape layer (102) and the cable core (101) is filled with water-blocking powder, an inner lining layer (103) is provided on the outside of the tape layer (102), an aluminum-plastic composite tape (104) is provided on the outside of the inner lining layer (103), an outer sheath (105) is provided on the outside of the aluminum-plastic composite tape (104), and an outer sheath (105) is provided on the outside of the outer sheath (105); A sealing component (2) is provided at the end of the outer sheath (105), and the sealing component (2) is used to seal the end of the cable body (1); a protective component (3) is provided on the outer sheath (105), and the protective component (3) is used to protect the outer sheath (105); the sealing component (2) and the protective component (3) cooperate to seal the connection between two adjacent cable bodies (1); The sealing assembly (2) comprises a sealing pad (201), the sealing pad (201) is a hollow structure, and an inflation tube (211) is provided on the side of the sealing pad (201); The protection component (3) comprises an air guide hole (301) and an annular seat (302); a mounting seat (303) of an annular structure is provided on the inner side of the annular seat (302); a bellows (305) is provided on the side of the mounting seat (303); a magnetic ring (306) is provided at the end of the bellows (305); an air intake pipe (308) is provided through the bottom of the annular seat (302); an electric control valve is provided at one end of the air intake pipe (308) located inside the annular seat (302); and a metal plate (309) is provided at the closed end of the annular seat (302); The end of the outer sheath (105) is sleeved with a sealing cover (202), and the end of the sealing cover (202) is sleeved on the cable core (101); An annular groove (206) is formed on the inner end surface of the sealing cover (202), and a sealing ring (207) is formed on the end surface of the sealing gasket (201), wherein the sealing ring (207) corresponds to the annular groove (206); The inner and outer walls of the bellows (305) are hollow structures; A telescopic rod (310) is provided on the inner wall of the annular seat (302), the telescopic rod (310) corresponds to the hollow portion of the bellows (305), a pressure sensor (311) is provided at the end of the telescopic rod (310), and a limit spring (312) is sleeved on the telescopic rod (310).

2. The longitudinal waterproof cable according to claim 1, characterized in that: The sealing gasket (201) is arranged at the end of the cable body (1), the sealing gasket (201) is sleeved with the cable core (101), and the maximum diameter of the sealing gasket (201) is the same as that of the outer sheath (105).

3. The longitudinal waterproof cable according to claim 2, characterized in that: The inner diameter of the sealing cover (202) is the same as the diameter of the outer sleeve (105); a limiting groove (203) of an annular structure is provided at the inner wall end of the sealing cover (202); a limiting ring (204) is provided in the limiting groove (203); a sealing ring (205) is provided at the end of the limiting ring (204); and the diameter of the sealing ring (205) is the same as that of the sealing cover (202).

4. The longitudinal waterproof cable according to claim 3, characterized in that: The outer end surface of the sealing cover (202) is provided with a telescopic tube (208), the end of the telescopic tube (208) is provided with a docking ring (209), and a water immersion sensor (210) is provided inside the telescopic tube (208).

5. The longitudinal waterproof cable according to claim 4, characterized in that: The inflation tube (211) passes through the sealing cover (202) and the telescopic tube (208) in sequence and is connected to an external air supply system. A solenoid valve is provided at one end of the inflation tube (211) close to the air supply system.

6. The longitudinal waterproof cable according to claim 1, characterized in that: The air guide holes (301) are formed in an annular array and are opened on the end surface of the outer sheath (105) and penetrate the outer sheath (105). The annular seat (302) is formed in a linear array and is sleeved on the outer sheath (105). The cross section of the annular seat (302) is a "]"-shaped structure.

7. The longitudinal waterproof cable according to claim 6, characterized in that: An arc-shaped groove (304) is provided on the side of the mounting seat (303), and the hollow portion of the bellows (305) is correspondingly connected to the arc-shaped groove (304).

8. The longitudinal waterproof cable according to claim 7, characterized in that: An annular plate (307) is provided on the inner wall of the magnetic ring (306); the annular plate (307) is made of elastic material; the inner wall of the annular plate (307) is in contact with the circumferential surface of the outer sheath (105); An outer end of the air inlet pipe (308) penetrates the circumferential surface of the outer sheath (105) and is in communication with the air guide hole (301).

9. A production process for a longitudinal waterproof cable, the production process being used to produce the longitudinal waterproof cable as claimed in claim 1, characterized in that: The following steps are involved: S1, drawing a metal material for making a cable core (101) into a wire of a desired diameter through a wire drawing machine, and annealing the wire after drawing; S2, using an extruder to extrude the insulating material and wrap it around the conductor to form an insulating layer, the conductor and the insulating layer together form a cable core (101), and a plurality of cable cores (101) are twisted according to a rule; S3, using a wrapping machine to wrap the tape layer (102) around the outside of the cable core (101), using a filling device to evenly fill the water-blocking powder between the tape layer (102) and the cable core (101), and using an extruder to wrap the inner lining layer (103) around the outside of the tape layer (102); S4, after the aluminum-plastic composite belt (104) blank is released by the guide wheel, it is sequentially coated on the outside of the inner lining layer (103) through three stainless steel tapered forming dies, and the overlapping joints of the two edges of the aluminum-plastic composite belt (104) blank are heated to fuse the two longitudinal edges of the aluminum-plastic composite belt (104) blank together, thereby achieving coating molding of the aluminum-plastic composite belt (104) blank on the cable semi-finished product; S5, pulling the semi-finished cable coated with the aluminum-plastic composite tape (104) into a sizing die with a heating function, and shaping the aluminum-plastic composite tape (104) through extrusion in the sizing die; S6. By installing an extruder after the longitudinal wrapping machine, the longitudinally wrapped semi-finished cable is introduced into the extruder, and the extrusion head extrude a dense plastic protective layer to form an outer sheath (105) which is tightly combined with the surface of the heated aluminum-plastic composite tape (104), thereby realizing the molding of the cable body (1).

Images