Insulating material of high-voltage submarine cable and preparation method thereof

Abstract

The invention discloses an insulating material of a high-voltage submarine cable and a preparation method thereof, and the method comprises the following steps: S1, when a cable outer protection insulating sleeve is produced, firstly opening a material injection operation pipe through a limiting valve, and injecting an insulating material into an electric heating relay box through the material injection operation pipe by an external plastic extruding machine; s2, after filling is completed, a cable core penetrates into the inner side of an outer sheath shaping mold, a feeding hydraulic cylinder drives a feeding pushing plate to push an insulating material to enter the shaping mold through a double-inlet and multi-outlet pipe, full sleeving of the cable core and an outer sheath is achieved through multi-section feeding, connection sealing and thickened sealing are completed in multi-section pressing, and the cable core and the outer sheath are sealed; according to the invention, through multi-chamber serial circulation cooling, the cooling time of the outer protective insulation sleeve is prolonged, slow cooling is realized, thermal stress and insulation layer crystallinity change caused by too high cooling speed are avoided, and thus micropores or cracks are avoided.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, specifically to an insulating material for high-voltage submarine cables and its preparation method. Background Technology

[0002] A cable is a device for transmitting electrical energy or signals, usually composed of several or groups of conductors. Ultra-high voltage submarine cables represent the cutting-edge technology in the field of high-voltage direct current transmission, playing a core role, especially in long-distance offshore wind power grid connection projects. The preparation of the insulation layer of submarine cables is one of the most crucial and critical steps in the entire cable manufacturing process, directly determining the cable's electrical performance, long-term reliability, and service life. Cross-linked polyethylene is mainly used as the mainstream insulation material.

[0003] However, during the current cable insulation sleeve manufacturing process, the insulation sleeve is prone to uneven thickness or air bubbles due to the influence of the extruder's hot melting speed and feeding speed. This greatly affects the insulation effect. Furthermore, during cooling, uneven cooling speed can easily lead to micropores or cracks in the insulation sleeve due to excessive thermal stress changes. Summary of the Invention

[0004] This invention provides an insulating material for high-voltage submarine cables and its preparation method, which can effectively solve the problems mentioned in the background art, such as uneven thickness or air bubbles in the insulation sleeve during continuous production due to the influence of the extruder's hot melting speed and feeding speed, and micropores or cracks in the insulation sleeve due to uneven cooling speed during cooling.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An insulating material for a high-voltage submarine cable, the insulating material comprising modified polyvinyl chloride resin, dioctyl phthalate, epoxidized soybean oil, calcium-zinc composite heat stabilizer, spherical magnesium hydroxide filler, polyether ester lubricant, antioxidant, and antistatic agent.

[0006] Further, the insulating material is formulated as follows: modified polyvinyl chloride resin: 60-70%, dioctyl phthalate: 10-15%, epoxidized soybean oil: 6-10%, calcium-zinc composite heat stabilizer: 3-6%, spherical magnesium hydroxide filler: 6-10%, polyether ester lubricant: 1.0-2.0%, antioxidant and antistatic agent: 1.0-2.0%.

[0007] This invention also provides a method for preparing an insulating material for a high-voltage submarine cable, comprising the following steps: S1. When producing cable outer sheath insulation sleeves, first open the injection operation pipe through the restriction valve, and the external extruder injects the insulation material into the electric heating relay box through the injection operation pipe. S2. After the filling is completed, the cable core is inserted into the inner side of the outer sheath shaping mold. The feeding hydraulic cylinder drives the feeding push plate to push the insulation material into the shaping mold through the double inlet and multi outlet pipe. The core and the outer sheath are fully fitted through multi-stage feeding, and the connection sealing and thickening sealing are completed in multi-stage pressing. S3. After the insulation sleeve is manufactured, the cooling water in the low temperature storage tank is sprayed into the rapid cooling tank by the extraction pump and spray pipe rack for initial cooling. The cooling water is then introduced into the multi-chamber cooling tank by the extraction pump and circulation connecting pipe to realize multi-chamber series cooling with cooling water flowing from bottom to top. S4. During this process, the insulating sleeve comes into contact with the cooling box and heat exchange occurs. A slow cooling method is adopted to avoid micropores or cracks caused by thermal stress and sudden changes in crystallinity. After slow shaping, the cooling and molding speed is increased by direct injection of coolant. S5. During the cooling period, the hot steam in the rapid cooling box enters the heat exchange condensation box through the guide fan and exhaust fixed pipe for condensation and recovery. Subsequently, the pressing electric slide rail drives the pressing operation box and water-absorbing sponge to press and absorb water and dry the outer insulation layer of the cable.

[0008] Furthermore, the preparation method is implemented using a preparation device, which includes a fixed support frame and a molding assembly. The molding assembly is located on the side of the fixed support frame and includes an outer sheath shaping mold disposed inside the fixed support frame. A dual-inlet, multi-outlet pipe is connected to the outer sheath shaping mold via an adapter. Electric heating relay boxes are respectively installed at the top and bottom of the fixed support frame at positions corresponding to the dual-inlet, multi-outlet pipes. Each electric heating relay box is equipped with several feeding hydraulic cylinders, one end of which is connected to a feeding device. The push plate has a material injection operation pipe connected to both ends of the electric heating relay box. A limiting valve is embedded in one end of both the dual-inlet multi-outlet pipe and the material injection operation pipe. A multi-cavity cooling box is installed at one end of the fixed support frame. Several circulating connecting pipes are connected through the inside of the multi-cavity cooling box at intervals. A rapid cooling box is installed at one end of the multi-cavity cooling box. A spray pipe frame is connected through the side of the rapid cooling box. A spray head is installed at one end of the spray pipe frame through an adapter. A pump is installed at the bottom of both the multi-cavity cooling box and the rapid cooling box through a motor base.

[0009] Furthermore, one end of the dual-inlet multi-outlet pipe is installed through one end of the electric heating relay box, and the feed push plate is slidably installed inside the electric heating relay box.

[0010] Furthermore, the longitudinal section of the circulation connecting pipe is U-shaped, wherein one end of the circulation connecting pipe is connected to one end of the extraction pump via an adapter.

[0011] Furthermore, one end of the spray pipe frame is connected to one end of the extraction pump via an adapter, and the input ends of the electric heating relay box, the feeding hydraulic cylinder, the limiting valve, and the extraction pump are all electrically connected to the output end of an external power supply.

[0012] Furthermore, the preparation device also includes a fitting component, which is disposed on the side of the multi-cavity cooling box. The fitting component includes a low-temperature liquid storage tank, which is disposed at the bottom of the multi-cavity cooling box. The top of the rapid cooling box is provided with several exhaust fixing pipes, and a guide fan is embedded inside the exhaust fixing pipes. The top of the rapid cooling box is provided with a heat exchange condenser. A pressing electric slide rail is symmetrically installed at one end of the rapid cooling box. A pressing operation box is installed at one end of the pressing electric slide rail, and a water-absorbing sponge is sleeved inside the pressing operation box.

[0013] Furthermore, the exhaust pipe is installed through the inside of the heat exchange condenser, and the input ends of the low-temperature liquid storage tank, the guide fan, and the pressing electric slide rail are all electrically connected to the output end of an external power supply.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a scientific and reasonable structure and is safe and convenient to use. 1. Equipped with a molding component, the insulating material is propelled into the inner side of the outer sheath molding die through a double-inlet, multi-outlet pipe by a feeding hydraulic cylinder and a feeding pusher. Multi-stage feeding gradually fills the die, achieving a full fit between the outer sheath and the wire core. Multi-position segmented feeding improves feeding stability and reduces uneven thickness of the outer sheath caused by uneven feeding speed. Exhausting air by extrusion prevents air bubbles from causing holes on the outer side of the insulation. Cooling water is injected into the multi-chamber cooling box by an extraction pump and a circulating pipe. The multi-chamber circulating cooling extends the cooling time of the outer sheath, achieving slow cooling and preventing thermal stress and changes in insulation crystallinity caused by excessively rapid cooling, thus avoiding micropores or cracks. Combined with the extraction pump, spray pipe frame, and spray head, direct spray cooling is applied to the outer side of the insulation, achieving rapid cooling after molding and increasing the molding speed.

[0015] 2. Equipped with a cooperating component, the hot steam in the rapid cooling box is discharged into the heat exchange condensation box through the guide fan and exhaust pipe. The heat in the rapid cooling box is quickly reduced by the discharge of hot steam, and the hot steam is condensed and recovered to improve the overall cooling speed. The pressing operation box and the water-absorbing sponge are moved in opposite directions by the pressing electric slide rail, pressing the water-absorbing sponge to the insulation layer of the outer end of the cable to absorb and dry the residual water, thereby improving the speed of cable production and the stability of the process. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the method steps of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the molding component of the present invention; Figure 4 This is a schematic diagram of the installation structure of the feeding hydraulic cylinder of the present invention; Figure 5 This is a schematic diagram of the structure of the mating components of the present invention; Numbering on the map: 1. Fixed support frame; 2. Molding components; 201. Outer sheath shaping mold; 202. Dual-inlet multi-outlet pipe; 203. Electric heating relay box; 204. Feeding hydraulic cylinder; 205. Feeding push plate; 206. Injection operation pipe; 207. Restriction valve; 208. Multi-cavity cooling box; 209. Circulation connecting pipe; 210. Rapid cooling box; 211. Spray pipe frame; 212. Spray head; 213. Extraction pump; 3. Matching components; 301. Low-temperature liquid storage tank; 302. Exhaust fixing pipe; 303. Guide fan; 304. Heat exchange condenser box; 305. Pressing electric slide rail; 306. Pressing operation box; 307. Water-absorbing sponge. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] This invention provides an insulation material for high-voltage submarine cables, comprising modified polyvinyl chloride resin, dioctyl phthalate, epoxidized soybean oil, calcium-zinc composite heat stabilizer, spherical magnesium hydroxide filler, polyether ester lubricant, antioxidant, and antistatic agent.

[0020] Furthermore, the insulation material is formulated as follows: modified polyvinyl chloride resin: 60-70%, dioctyl phthalate: 10-15%, epoxidized soybean oil: 6-10%, calcium-zinc composite heat stabilizer: 3-6%, spherical magnesium hydroxide filler: 6-10%, polyether ester lubricant: 1.0-2.0%, antioxidant and antistatic agent: 1.0-2.0%.

[0021] like Figures 1-5As shown, the present invention also provides a method for preparing the above-mentioned insulating material, comprising the following steps: S1. When producing cable outer sheath insulation sleeves, first open the injection operation pipe 206 through the restriction valve 207, and the external extruder injects the insulation material into the electric heating relay box 203 through the injection operation pipe 206.

[0022] S2. After the filling is completed, the cable core is inserted into the inner side of the outer sheath shaping mold 201. The feeding hydraulic cylinder 204 drives the feeding push plate 205 to push the insulation material into the shaping mold 201 through the double inlet and multi outlet pipe 202. The core and the outer sheath are fully fitted through multi-stage feeding, and the connection sealing and thickening sealing are completed in multi-stage pressing.

[0023] S3. After the insulating sleeve is manufactured, the cooling water in the low temperature storage tank 301 is sprayed into the rapid cooling tank 210 by the extraction pump 213 and the spray pipe rack 211 for initial cooling. The cooling water is then introduced into the multi-chamber cooling tank 208 by the extraction pump 213 and the circulation connecting pipe 209 to realize multi-chamber series cooling with cooling water flowing from bottom to top.

[0024] S4. During this process, the insulating sleeve comes into contact with the cooling box 208 and heat exchange occurs. A slow cooling method is adopted to avoid micropores or cracks caused by thermal stress and sudden changes in crystallinity. After slow shaping, the cooling and molding speed is increased by direct injection of coolant.

[0025] S5. During the cooling period, the hot steam in the rapid cooling box 210 enters the heat exchange condensing box 304 through the guide fan 303 and the exhaust fixed pipe 302 for condensation and recovery. Subsequently, the pressing electric slide rail 305 drives the pressing operation box 306 and the water-absorbing sponge 307 to press and absorb water to dry the outer insulation layer of the cable, thereby improving production efficiency and finished product stability.

[0026] The above-mentioned preparation method is realized by a preparation device, which includes a fixed support frame 1, a molding component 2, and a mating component 3. The molding component 2 is provided on the side of the fixed support frame 1. The molding component 2 includes an outer sheath shaping mold 201, a double-inlet multi-outlet pipe 202, an electric heating relay box 203, a feeding hydraulic cylinder 204, a feeding push plate 205, a material injection operation pipe 206, a limiting valve 207, a multi-cavity cooling box 208, a circulation connecting pipe 209, a rapid cooling box 210, a spray pipe frame 211, a spray head 212, and a pump 213.

[0027] An outer sheath shaping mold 201 is provided on the inner side of the fixed support frame 1. The outer sheath shaping mold 201 is symmetrically connected to a double-inlet multi-outlet pipe 202 via an adapter on its side end. An electric heating relay box 203 is provided at the top and bottom of the fixed support frame 1 at the positions corresponding to the double-inlet multi-outlet pipe 202. Several feeding hydraulic cylinders 204 are equidistantly arranged at one end of the electric heating relay box 203. A feeding push plate 205 is provided at one end of the feeding hydraulic cylinder 204. One end of the double-inlet multi-outlet pipe 202 is installed through and installed at one end of the electric heating relay box 203. The feeding push plate 205 is slidably installed inside the electric heating relay box 203 to achieve steady material discharge and ensure the stability of multi-position feeding.

[0028] Both ends of the electric heating relay box 203 are connected to the injection operation pipe 206, and a limiting valve 207 is embedded in one end of both the double inlet and multi-outlet pipe 202 and the injection operation pipe 206.

[0029] A multi-chamber cooling box 208 is installed at one end of the fixed support frame 1. Several circulating connecting pipes 209 are equidistantly connected inside the multi-chamber cooling box 208. The longitudinal section of the circulating connecting pipe 209 is U-shaped. One end of the circulating connecting pipe 209 is connected to one end of the extraction pump 213 through an adapter to realize multi-chamber series heat exchange treatment.

[0030] A rapid cooling box 210 is installed at one end of the multi-chamber cooling box 208, and a spray pipe rack 211 is connected through the side of the rapid cooling box 210.

[0031] One end of the spray pipe frame 211 is equipped with a spray head 212 via an adapter. The bottom ends of the multi-chamber cooling box 208 and the rapid cooling box 210 are both equipped with extraction pumps 213 via motor mounts. One end of the spray pipe frame 211 is connected to one end of the extraction pump 213 via an adapter to ensure the stability of the spray treatment and water inlet treatment.

[0032] To ensure stable operation of the equipment, the input terminals of the electric heating relay box 203, the feeding hydraulic cylinder 204, the limiting valve 207, and the extraction pump 213 are all electrically connected to the output terminal of an external power supply.

[0033] The fitting component 3 is located on the side of the multi-cavity cooling box 208. The fitting component 3 includes a low-temperature liquid storage tank 301, an exhaust fixing pipe 302, a guide fan 303, a heat exchange condenser box 304, a pressing electric slide rail 305, a pressing operation box 306, and a water-absorbing sponge 307.

[0034] The bottom of the multi-chamber cooling box 208 is equipped with a low-temperature liquid storage tank 301, and the top of the rapid cooling box 210 is equidistantly connected with several exhaust fixing pipes 302.

[0035] A guide fan 303 is embedded inside the exhaust fixing pipe 302, and a heat exchange condenser box 304 is set at the top of the rapid cooling box 210. The exhaust fixing pipe 302 is installed through the inside of the heat exchange condenser box 304 to realize exhaust and condensation treatment.

[0036] A pressing electric slide rail 305 is symmetrically installed at one end of the rapid cooling box 210. A pressing operation box 306 is installed at one end of the pressing electric slide rail 305. A water-absorbing sponge 307 is sleeved inside the pressing operation box 306.

[0037] To ensure stable operation of the equipment, the input terminals of the cryogenic liquid storage tank 301, the guide fan 303, and the pressure electric slide rail 305 are all electrically connected to the output terminal of an external power supply.

[0038] The working principle and usage process of this invention are as follows: During the production of cable outer sheath insulation sleeves, the injection operation pipe 206 is opened through the limiting valve 207. Insulating material is injected into the electric heating relay box 203 through the external extruder and the injection operation pipe 206. After filling, the cable core is inserted into the inner side of the outer sheath shaping mold 201. The feeding hydraulic cylinder 204 drives the feeding push plate 205 to move along the electric heating relay box 203. The feeding push plate 205 pushes the insulating material into the inner side of the outer sheath shaping mold 201 through the double-inlet multi-outlet pipe 202. Through multi-stage feeding, the insulation sleeve and the core are gradually filled, achieving full fitting of the outer sheath insulation sleeve and the core. This ensures the steady production of the cable insulation sleeve. Furthermore, through multi-stage pressing, the connection sealing and thickened sealing treatment are ensured, guaranteeing the insulation effect.

[0039] After the cable insulation sleeve is manufactured, the extraction pump 213 and spray pipe frame 211 extract cooling water from the low-temperature storage tank 301. The cooling water is sprayed into the inside of the rapid cooling box 210 through the spray pipe frame 211 and spray head 212. The extraction pump 213 and circulation connecting pipe 209 extract cooling water from the rapid cooling box 210. The cooling water cup is injected into the inside of the multi-chamber cooling box 208. The multi-chamber is connected through the circulation connecting pipe 209, so that the cooling water flows from bottom to top. At this time, the high-temperature insulation sleeve contacts the side end of the multi-chamber cooling box 208 to achieve heat exchange cooling and shaping. Slow cooling avoids thermal stress and changes in the crystallinity of the insulation layer caused by excessive cooling speed, thereby avoiding the generation of micropores or cracks. After slow shaping is completed, direct cooling with coolant is used to increase the cooling speed and the forming speed. During the cooling process, the hot steam in the rapid cooling box 210 is guided by the guide fan 303 and the exhaust fixed pipe 302 and discharged into the inside of the heat exchange condensation box 304 to realize the external discharge and condensation recovery of hot steam. The pressing operation box 306 and the water-absorbing sponge 307 are moved in opposite directions by the pressing electric slide rail 305, pressing the water-absorbing sponge 307 to the insulation layer of the outer end of the cable to absorb and dry the residual water, thereby improving the speed of cable production and the stability of the process.

[0040] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An insulation material for a high voltage submarine cable, characterized in that, The insulating material includes modified polyvinyl chloride resin, dioctyl phthalate, epoxidized soybean oil, calcium-zinc composite heat stabilizer, spherical magnesium hydroxide filler, polyether ester lubricant, antioxidant and antistatic agent.

2. A process for the preparation of an insulation material for high voltage submarine cables according to claim 1, characterized in that, The insulating material is formulated as follows: modified polyvinyl chloride resin: 60-70%, dioctyl phthalate: 10-15%, epoxidized soybean oil: 6-10%, calcium-zinc composite heat stabilizer: 3-6%, spherical magnesium hydroxide filler: 6-10%, polyether ester lubricant: 1.0-2.0%, antioxidant and antistatic agent: 1.0-2.0%.

3. A process for the preparation of an insulation material for high voltage submarine cables, characterized in that, Includes the following steps: S1. When producing cable outer sheath insulation sleeves, first open the injection operation pipe (206) through the limiting valve (207), and the external extruder injects the insulation material into the electric heating relay box (203) through the injection operation pipe (206); S2. After the filling is completed, the cable core is inserted into the inner side of the outer sheath shaping mold (201). The feeding hydraulic cylinder (204) drives the feeding push plate (205) to push the insulation material into the shaping mold (201) through the double inlet and multi outlet pipe (202). The core and the outer sheath are fully fitted through multi-stage feeding, and the connection sealing and thickening sealing are completed in multi-stage pressing. S3. After the insulation sleeve is manufactured, the cooling water in the low temperature storage tank (301) is sprayed into the rapid cooling tank (210) by the extraction pump (213) and the spray pipe rack (211) for initial cooling. The cooling water is then introduced into the multi-chamber cooling tank (208) by the extraction pump (213) and the circulation connecting pipe (209) to realize multi-chamber series cooling with cooling water flowing from bottom to top. S4. During this process, the insulating sleeve comes into contact with the cooling box (208) and heat exchange occurs. The slow cooling method is adopted to avoid micropores or cracks caused by thermal stress and sudden changes in crystallinity. After slow shaping, the cooling and molding speed is increased by direct injection of coolant. S5. During the cooling period, the hot steam in the rapid cooling box (210) enters the heat exchange condensing box (304) through the guide fan (303) and the exhaust fixed pipe (302) for condensation and recovery. Subsequently, the pressing electric slide rail (305) drives the pressing operation box (306) and the water-absorbing sponge (307) to press and absorb water to dry the outer insulation layer of the cable.

4. A process for the preparation of an insulation material for a high voltage submarine cable according to claim 3, characterized in that, The preparation method is implemented by a preparation device, which includes a fixed support frame (1) and a molding component (2). The molding component (2) is provided on the side of the fixed support frame (1). The molding component (2) includes an outer sheath shaping mold (201). The outer sheath shaping mold (201) is located inside the fixed support frame (1). A double-inlet multi-outlet pipe (202) is connected to the outer sheath shaping mold (201) through an adapter. Electric heating relay boxes (203) are respectively provided at the top and bottom of the fixed support frame (1) at the positions corresponding to the double-inlet multi-outlet pipe (202). The electric heating relay box (203) is provided with several feeding hydraulic cylinders (204). One end of the feeding hydraulic cylinder (204) is connected to a feeding push plate (205). The electric heating relay box (203) Both ends are connected to the injection operation pipe (206). The double inlet and multi outlet pipe (202) and the injection operation pipe (206) are both embedded with a limiting valve (207). The fixed support frame (1) is equipped with a multi-cavity cooling box (208) at one end. The multi-cavity cooling box (208) is connected with several circulating connecting pipes (209) at intervals on the inner side. The multi-cavity cooling box (208) is equipped with a rapid cooling box (210) at one end. The rapid cooling box (210) is connected to a spray pipe frame (211) at the side end. The spray pipe frame (211) is equipped with a spray head (212) at one end through an adapter. The multi-cavity cooling box (208) and the rapid cooling box (210) are both equipped with a pump (213) through a motor base at the bottom.

5. A process for the preparation of an insulation material for a high voltage submarine cable according to claim 4, characterized in that, One end of the dual-inlet multi-outlet pipe (202) is installed through one end of the electric heating relay box (203), and the feeding push plate (205) is slidably installed inside the electric heating relay box (203).

6. A process for the preparation of an insulation material for high voltage submarine cables according to claim 4, characterized in that, The longitudinal section of the circulation connecting pipe (209) is U-shaped, wherein one end of the circulation connecting pipe (209) is connected to one end of the extraction pump (213) through an adapter.

7. A process for the preparation of an insulation material for high voltage submarine cables according to claim 4, characterized in that, One end of the spray pipe frame (211) is connected to one end of the extraction pump (213) via an adapter. The input ends of the electric heating relay box (203), the feeding hydraulic cylinder (204), the limiting valve (207), and the extraction pump (213) are all electrically connected to the output end of an external power supply.

8. A process for the preparation of an insulation material for a high voltage submarine cable according to claim 7, characterized in that, The preparation device further includes a fitting component (3), which is located at the side of the multi-cavity cooling box (208). The fitting component (3) includes a low-temperature liquid storage tank (301), which is located at the bottom of the multi-cavity cooling box (208). The top of the rapid cooling box (210) is provided with several exhaust fixing pipes (302), and a guide fan (303) is embedded inside the exhaust fixing pipes (302). The top of the rapid cooling box (210) is provided with a heat exchange condenser box (304). A pressing electric slide rail (305) is symmetrically installed at one end of the rapid cooling box (210). A pressing operation box (306) is installed at one end of the pressing electric slide rail (305), and a water-absorbing sponge (307) is sleeved inside the pressing operation box (306).

9. A process for the preparation of an insulation material for a high voltage submarine cable according to claim 8, characterized in that, The exhaust pipe (302) is installed inside the heat exchange condenser (304), and the input ends of the low-temperature liquid storage tank (301), the guide fan (303) and the pressure electric slide rail (305) are all electrically connected to the output end of the external power supply.

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