A high molecular weight polyethylene insulating layer module for high voltage cables that can be secondarily formed

Abstract

The present invention discloses a high-molecular-weight polyethylene insulation layer module for high-voltage cables that can be secondarily formed, which relates to the field of high-voltage cable fusion splicing. It includes a module. The module is in a semi-circular tubular shape. A clamping block is integrally connected to the bottom of the module. The clamping block is bent at a right angle towards one side. The number of clamping blocks is two, and the two clamping blocks are bent towards the same side at the bottom of the module. Two modules are used in a set. The two modules are clamped by the clamping blocks, and the two modules are centrosymmetric. The present invention realizes the effect of secondary forming of the module by cold stamping during production and secondary heating during use. In addition, the module made of high-molecular-weight polyethylene material has better wear resistance, corrosion resistance, impact resistance and tensile resistance. By setting the module, two modules are assembled to splice the insulation layer, and the two modules are clamped, which can effectively simplify the installation steps of the module and make the insulation layer splicing operation faster and more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage cable fusion splicing, and particularly to a high-molecular-weight polyethylene insulating layer module for high-voltage cables that can be secondarily formed. Background Art

[0002] Cable fusion splicing is a technology for connecting two sections of cables, which is widely used in cable fault repair and new construction projects in the fields of electricity and communication. Cable fusion splicing melts the inner cores, insulating layers, sheaths and other materials of two cables into a whole by means of high-temperature sintering to achieve cable connection and insulation functions, which can effectively improve the construction quality and efficiency of power projects and ensure the reliability of the power system.

[0003] Currently, the fusion splicing of the insulating layer between two cables usually uses the heat-shrinkable tube method or the cold-shrinkable tube method. Among them, the heat-shrinkable tube method is to put a heat-shrinkable tube or a cold-shrinkable tube on the cable connection and fix it, and then use a hot air gun to heat the heat-shrinkable tube to make it shrink and tightly wrap the insulating layer to complete the fusion splicing.

[0004] The heat-shrinkable tubes used in the existing cable fusion splicing process are in a circular tube shape. If they want to be installed at the connection of the insulating layer where the core wires have been connected, they need to be manually cut open, then put on the connection and fixed with a winding tape, which has the problem that the insulating layer fusion splicing operation is too troublesome; there is a lack of a fusion splicing module that can achieve rapid fusion splicing of the cable insulating layer and has a convenient operation during the assembly process. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-molecular-weight polyethylene insulating layer module for high-voltage cables that can be secondarily formed to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A high-molecular-weight polyethylene insulating layer module for high-voltage cables that can be secondarily formed, including a module. The module is in a semi-circular tubular shape. A clamping block is integrally connected to the bottom of the module. The clamping block is bent at a right angle towards one side. The number of clamping blocks is two, and the two clamping blocks are bent towards the same side at the bottom of the module.

[0007] Preferably, two modules are used in a set. The two modules are clamped by the clamping blocks, and the two modules are centrosymmetric.

[0008] A preparation process for a high-molecular-weight polyethylene insulating layer module for high-voltage cables that can be secondarily formed includes the following steps:

[0009] S1: Put the high-molecular polyethylene material into an injection molding machine in a clean environment of ten thousand class. The temperature of the injection molding machine is maintained within the range of 60°C - 80°C, so that the injection molding machine crushes the high-molecular polyethylene material into powder;

[0010] S2: Pour high molecular weight polyethylene powder into the mold of a stamping machine, and add 1% of an activator with carbon tetrachloride as the main raw material. Conduct preliminary stamping and forming under the conditions of a temperature of 60°C - 80°C and a pressure of 1.9 MPa to prepare a module. At this time, the powder particles in the module only contact and bond with each other without cross-linking.

[0011] S3: Take out the module from the stamping machine and let it cool naturally, and conduct vacuum packaging in a clean environment.

[0012] A method for using a high molecular weight polyethylene insulating layer module for high-voltage cables that can be secondarily formed, comprising the following steps:

[0013] Splice two preliminarily pressed modules to the joints of two cables. Wind a high-temperature isolation tape on the surface of the module, then put an external heating tape outside the high-temperature isolation tape, wind high-frequency internal heating tubes on both sides of the external heating tape, and externally connect the external heating tape and the high-frequency internal heating tubes to a heating control device to conduct secondary heating on the module. The heating temperature is 140 - 180°C, and the heating time is not less than 30 minutes. After heating, the particles in the module and at the contact part of the two modules cross-link and fuse, completing the fusion with the original insulating layer on the cable.

[0014] Preferably, the stamping machine includes a lower die base embedded in the upper surface of the machine case. The upper surface of the lower die base is embedded with a lower die. The upper surface of the lower die base is connected with a fixed seat. A stamping component is installed on the top of the fixed seat. The bottom of the stamping component passes through the fixed seat and is connected with an upper die base. The bottom of the upper die base is connected with an upper die. The number of the lower dies is four, and they are arranged at equal distances in the lower die base.

[0015] Preferably, an activity groove is opened inside the lower die base on one side of the lower die. A cavity is opened inside the lower die. An activity die is installed inside the cavity. A groove is opened on one side of the activity die. A first clamping die is installed on the inner wall of the cavity on one side of the activity die. A second clamping die is installed on the inner wall of the cavity on the other side of the activity die. A baffle is installed inside the cavity on one side of the activity die. A driving mechanism is connected to the side wall of the baffle. A chute is opened inside the lower die below the activity die. A mold opening mechanism is installed inside the chute. Both the first clamping die and the second clamping die are integrally connected with the lower die. The second clamping die is movably inserted into the activity die through the groove. The activity die is slidably connected to the bottom surface of the cavity.

[0016] Preferably, the driving mechanism includes a fixed column installed at the center of the side wall of the baffle. The side of the fixed column away from the baffle passes through the side wall of the lower die and is connected with a connecting plate. An activity plate is vertically connected to the bottom of the connecting plate. An electric push rod is connected to one side of the activity plate.

[0017] Preferably, the baffle is slidably connected to the bottom surface of the cavity. The baffle is connected to the connecting plate through a fixing column. The numbers of the baffle and the connecting plate are both four, and the bottoms of the four connecting plates are connected to the movable plate.

[0018] Preferably, the mold opening mechanism includes a slider installed at the bottom of the movable mold. A screw hole is penetrated through the middle of the slider. A screw rod is penetrated inside the screw hole. One end of the screw rod is connected to a motor. The other end of the screw rod passes through four lower molds and a bearing is installed between the screw rod and the lower mold base. The number of the screw rods is two, and transmission wheels are installed on both of the two screw rods. A transmission belt is connected between the two transmission wheels in a transmission manner.

[0019] Preferably, the slider is stuck inside the chute and forms a sliding connection with the chute. The screw rod sequentially penetrates through the four lower molds, and the screw rod forms a threaded connection with the sliders inside the four lower molds through the screw holes.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. For the high molecular weight polyethylene insulation layer module of high-voltage cable that can be secondarily formed, by adding 1% of an active agent mainly composed of carbon tetrachloride to the powder of high molecular weight polyethylene and initially stamping to form a module in a low-temperature state of 60°C - 80°C. In this initially formed state, only contact bonding exists between the powder particles in the module, and there is no crosslinked state. After the module is installed at the insulation layer connection, by secondary heating under the condition of 140°C - 180°C, the particles inside the module and the contact part between the two modules undergo crosslinking and welding, realizing the welding with the original insulation layer on the cable. By low-temperature stamping during production and secondary heating during use, the effect of secondary forming of the module is achieved; in addition, the module made of high molecular weight polyethylene material has better wear resistance, corrosion resistance, impact resistance and tensile resistance than the polyolefin hot melt pipe used in traditional welding, and can withstand greater external forces without being easily deformed or broken.

[0022] 2. For the high molecular weight polyethylene insulation layer module of high-voltage cable that can be secondarily formed, by setting the module, the module is initially stamped and produced in a stamping machine. When the module is used for welding the cable insulation layer, one module is placed upright above the insulation layer connection, the other module is placed upside down, and the two modules are clamped and assembled together through the clamping blocks, which is convenient for subsequent secondary processing of the module. By using two modules assembled to weld the insulation layer, and the two modules are clamped, the steps of module installation can be effectively simplified, and the operation of welding the insulation layer is made faster and more convenient.

[0023] 3. The high molecular weight polyethylene insulating layer module of the high-voltage cable that can be secondarily formed. By setting a mold opening mechanism, after the module is initially formed, the upper mold moves upward and separates from the lower mold. The module is in the cavity. The motor drives the screw to rotate, and the screw drives the slider to slide in the chute through the screw hole. The slider drives the movable mold to move toward the side of the second clamping mold in the cavity. The movable mold drives the clamping block at the bottom of the module to separate from the first clamping mold and the second clamping mold until the second clamping mold is inserted into the groove. The movable mold moves to quickly demold the clamping block at the bottom of the module, facilitating the removal of the module from the cavity. And multiple sliders are driven to move synchronously by the screw, achieving the effect of simultaneously opening the molds of the modules inside multiple lower molds.

[0024] 4. The high molecular weight polyethylene insulating layer module of the high-voltage cable that can be secondarily formed. By setting a baffle and a driving mechanism, during the process of the movable mold moving to open the mold, the electric push rod extends to push the movable plate to move. The movable plate drives multiple connecting plates to move in the movable groove. Multiple connecting plates drive multiple baffles to move simultaneously in the cavity through the fixed columns, adjusting the internal space of the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the assembled state of the module of the present invention;

[0026] Figure 2 is a schematic sectional structural diagram of the assembled state of the module of the present invention;

[0027] Figure 3 is a schematic front sectional structural diagram of the lower die mechanism of the stamping machine of the present invention;

[0028] Figure 4 is a schematic front sectional structural diagram of the driving mechanism of the stamping machine of the present invention;

[0029] Figure 5 is a schematic front sectional structural diagram of the front side of the lower die of the present invention;

[0030] Figure 6 is a schematic middle sectional structural diagram of the lower die of the present invention;

[0031] Figure 7 of the present invention Figure 3 is an enlarged schematic diagram of the structure of part A;

[0032] Figure 8 is a schematic diagram of the structure of the movable mold and the slider of the present invention.

[0033] In the figure: 1. Module; 2. Clamping block; 3. Stamping machine; 31. Lower die base; 311. Movable slot; 32. Lower die; 321. Cavity; 322. Movable die; 323. Groove; 324. First clamping die; 325. Second clamping die; 326. Baffle; 327. Driving mechanism; 3271. Fixed column; 3272. Connecting plate; 3273. Movable plate; 3274. Electric push rod; 328. Slide groove; 329. Die opening mechanism; 3291. Slide block; 3292. Screw hole; 3293. Screw; 3294. Motor; 3295. Driving wheel; 3296. Driving belt; 3297. Bearing; 33. Fixed seat; 34. Stamping assembly; 35. Upper die base; 36. Upper die. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] Such as Figures 1 to 8As shown in the figure, the high-voltage cable high-molecular-weight polyethylene insulating layer module that can be secondarily formed in this embodiment includes Module 1. Module 1 is in a semi-circular tubular shape. A clamping block 2 is integrally connected to the bottom of Module 1. The clamping block 2 is bent at a right angle towards one side. The number of clamping blocks 2 is two, and the two clamping blocks 2 are bent towards the same side at the bottom of Module 1. One clamping block 2 is located at the edge of the bottom of Module 1 close to one inner wall, and the other clamping block 2 is located at the edge of the bottom of Module 1 close to one outer wall.

[0038] Specifically, two Modules 1 are used in a set. The two Modules 1 are clamped through the clamping blocks 2, and the two Modules 1 are centrosymmetric. During use, one Module 1 is placed upright and the other Module 1 is placed upside down and assembled at the connection of the cable insulating layer. By using the two Modules 1 for assembly to weld the insulating layer, and the clamping connection between the two Modules 1 can effectively simplify the installation steps of Module 1 and make the insulating layer welding operation faster and more convenient.

[0039] A preparation process for a high-voltage cable high-molecular-weight polyethylene insulating layer module that can be secondarily formed includes the following steps:

[0040] S1: Put the high-molecular polyethylene material into an injection molding machine in a clean environment of ten thousand levels. The temperature of the injection molding machine is maintained within the range of 60°C - 80°C, so that the injection molding machine crushes the high-molecular polyethylene material to form powder;

[0041] S2: Pour the high-molecular polyethylene powder into the mold of the stamping machine 3, and add 1% of an active agent with carbon tetrachloride as the main raw material. Under the conditions of a temperature of 60°C - 80°C and a pressure of 1.9 MPa, perform preliminary stamping to form Module 1. At this time, only contact bonding occurs between the powder particles in Module 1 and no cross-linking occurs.

[0042] In this step, the method of using the preliminary stamping module 1 of the stamping forming machine 3 is as follows: after the module 1 is stamped and formed, the stamping assembly 34 is first controlled to move upward, the stamping assembly 34 drives the upper die seat 35 to move upward, the upper die seat 35 drives the upper die 36 to move upward and separate from the lower die 32, and the module 1 is in the cavity 321, and then the motor 3294 is started, the motor 3294 drives the screw rod 3293 to rotate, the screw rod 3293 drives the slider 3291 to slide in the slide groove 328 through the screw hole 3292, and the slider 3291 drives the movable die 322 to move toward one side of the second clamping die 325 in the cavity 321, and the electric push rod 3294 is driven to rotate. The rod 3274 extends to push the movable plate 3273 to move, and the movable plate 3273 drives the multiple connecting plates 3272 to move in the movable groove 311. The multiple connecting plates 3272 drive the multiple baffles 326 to move in the cavity 321 toward the side away from the movable mold 322 through the fixed column 3271. The movable mold 322 drives the block 2 at the bottom of the module 1 to separate from the first clamping mold 324 and the second clamping mold 325 until the second clamping mold 325 is inserted into the groove 323. The block 2 at the bottom of the module 1 is quickly demolded by the movement of the movable mold 322, and then the module 1 can be taken out of the cavity 321.

[0043] S3: taking the module 1 out of the stamping machine 3 to cool naturally, and vacuum packaging it in a clean environment;

[0044] The molecular weight of polyethylene in the raw material state is 500,000-1 million. The maximum molecular weight of polyethylene that plays a bonding role in the semi-finished product state is 3 million, and the minimum is 1.5 million. In addition, the minimum proportion of low molecular weight polyethylene in the semi-finished product state is not less than 30%, and the maximum does not exceed 50%.

[0045] A method for using a high-molecular-weight polyethylene insulation layer module for a high-voltage cable that can be secondary molded comprises the following steps:

[0046] Splice two modules 1 that have been preliminarily pressed to the joints of the two cables, wrap a high-temperature isolation tape around the surface of the module 1, then put an external heating tape on the outside of the high-temperature isolation tape, wrap a high-frequency internal heating tube around both sides of the external heating tape, and connect the external heating tape and the high-frequency internal heating tube to an external heating control device, perform secondary heating on the module 1, the heating temperature is 140-180°, the heating time is not less than 30 minutes, after heating, the particles inside the module 1 and the contact parts of the two modules 1 are cross-linked and welded, completing the welding with the original insulation layer on the cable.

[0047] The high-temperature isolation belt is used for thermal insulation protection to prevent the heat from dissipating during the insulation layer welding process and causing burns to the operators. The external heating belt, high-frequency internal heating tube and heating control equipment are all existing heating equipment for cable insulation layer welding, which are used here for secondary heating of module 1.

[0048] Specifically, the stamping machine 3 includes a lower die base 31 embedded in the upper surface of the chassis. The lower die 32 is embedded in the upper surface of the lower die base 31. The upper surface of the lower die base 31 is connected to a fixed seat 33. A stamping assembly 34 is installed on the top of the fixed seat 33. The bottom of the stamping assembly 34 passes through the fixed seat 33 and is connected to an upper die base 35. The bottom of the upper die base 35 is connected to an upper die 36. The number of the lower dies 32 is four, and they are arranged at equal intervals in the lower die base 31. The number of the upper dies 36 is also four, corresponding to the positions of the lower dies 32 one by one, for batch stamping and forming of the four modules 1. By pushing the upper die base 35 downward by the stamping assembly 34, the upper die base 35 drives the upper die 36 to move downward to close the die with the lower die 32, and stamp and form the high molecular weight polyethylene powder in the cavity 321.

[0049] Further, an activity groove 311 is opened inside the lower die base 31 on one side of the lower die 32. A cavity 321 is opened inside the lower die 32. A movable die 322 is installed inside the cavity 321. A groove 323 is opened on one side of the movable die 322. A first die clamping member 324 is installed on the inner wall of the cavity 321 on one side of the movable die 322. A second die clamping member 325 is installed on the inner wall of the cavity 321 on the other side of the movable die 322. The first die clamping member 324 and the second die clamping member 325 are respectively used for forming the two clamping blocks 2 at the bottom of the module 1. A baffle 326 is installed inside the cavity 321 on one side of the movable die 322, for adjusting the internal space of the cavity 321 to facilitate the movement and die opening of the movable die 322. The bottom of the baffle 326 is in precise contact with the bottom surface of the cavity 321, meeting the requirements for stamping and forming of the module 1. A driving mechanism 327 is connected to the side wall of the baffle 326, for driving multiple baffles 326 to move synchronously. A chute 328 is opened inside the lower die 32 below the movable die 322. A die opening mechanism 329 is installed inside the chute 328, for die opening of the clamping block 2 at the bottom of the module 1 to facilitate the blanking of the module 1. The first die clamping member 324 and the second die clamping member 325 are integrally connected to the lower die 32. The second die clamping member 325 is movably inserted into the movable die 322 through the groove 323. The movable die 322 is slidably connected to the bottom surface of the cavity 321.

[0050] Further, the driving mechanism 327 includes a fixed column 3271 installed at the center of the side wall of the baffle 326. The side of the fixed column 3271 away from the baffle 326 passes through the side wall of the lower die 32 and is connected to a connecting plate 3272. A movable plate 3273 is vertically connected to the bottom of the connecting plate 3272. An electric push rod 3274 is connected to one side of the movable plate 3273. The electric push rod 3274 is installed inside the lower die base 31. The telescopic end of the electric push rod 3274 is connected to the movable plate 3273. By extending the electric push rod 3274 to push the movable plate 3273 to move, the movable plate 3273 drives multiple connecting plates 3272 to move in the activity groove 311.

[0051] Further, the baffle 326 is slidably connected to the bottom surface of the cavity 321. The baffle 326 is connected to the connecting plate 3272 via the fixing column 3271. The numbers of the baffle 326 and the connecting plate 3272 are both four, and the bottoms of the four connecting plates 3272 are all connected to the movable plate 3273. When the multiple connecting plates 3272 move in the movable groove 311, the multiple connecting plates 3272 drive the multiple baffles 326 to move simultaneously in the cavity 321 via the fixing columns 3271, so as to adjust the internal space of the cavity 321.

[0052] Further, the mold opening mechanism 329 includes a slider 3291 installed at the bottom of the movable mold 322. A screw hole 3292 is penetrated through the middle of the slider 3291. A screw rod 3293 is penetrated through the screw hole 3292. One end of the screw rod 3293 is connected to a motor 3294. The motor 3294 is installed inside the lower mold base 31. The shaft end of the motor 3294 is connected to the screw rod 3293. And the motor 3294 is essentially a motor 3294 with a forward and reverse circuit. The other end of the screw rod 3293 passes through the four lower molds 32, and a bearing 3297 is installed between the screw rod 3293 and the lower mold base 31. The screw rod 3293 is rotatably connected to the lower mold base 31 via the bearing 3297 and can rotate relative to the four lower molds 32. The number of the screw rods 3293 is two, and transmission wheels 3295 are installed on both of the two screw rods 3293. A transmission belt 3296 is connected between the two transmission wheels 3295. The two screw rods 3293 are rotationally connected via the transmission wheels 3295 and the transmission belt 3296.

[0053] Furthermore, the slider 3291 is stuck inside the sliding groove 328 and forms a sliding connection with the sliding groove 328. The screw rod 3293 sequentially penetrates through the four lower molds 32, and the screw rod 3293 forms a threaded connection with the slider 3291 inside the four lower molds 32 via the screw hole 3292. By driving the screw rod 3293 to rotate through the motor 3294, the screw rod 3293 drives the slider 3291 to slide in the sliding groove 328 via the screw hole 3292. The slider 3291 drives the movable mold 322 to move towards the side of the second clamping mold 325 in the cavity 321. The movable mold 322 drives the clamping block 2 at the bottom of the module 1 to separate from the first clamping mold 324 and the second clamping mold 325 until the second clamping mold 325 is inserted into the groove 323. By the movement of the movable mold 322, the clamping block 2 at the bottom of the module 1 is quickly demolded, which is convenient for the module 1 to be taken out of the cavity 321. And the multiple sliders 3291 are synchronously driven by the screw rod 3293 to move, so as to achieve the effect of simultaneously opening the molds of the modules 1 inside the multiple lower molds 32.

[0054] Finally, it should be noted that the above are only 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 perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation process of a high molecular weight polyethylene insulation layer module for a high-voltage cable that can be secondarily formed, characterized in that: The steps include: S1: Put the high molecular polyethylene material into an injection molding machine in a clean environment at the ten-thousand-level. Keep the temperature of the injection molding machine within the range of 60°C - 80°C, so that the injection molding machine crushes the high molecular polyethylene material to form powder. S2: Pour the high molecular polyethylene powder into the mold of a stamping machine (3), and add 1% of an active agent with carbon tetrachloride as the main raw material. Conduct preliminary stamping and forming under the conditions of a temperature of 60°C - 80°C and a pressure of 1.9 MPa to prepare the module (1). At this time, the powder particles in the module (1) only contact and bond with each other without cross-linking. S3: Take out the module (1) from the stamping machine (3) and let it cool naturally, and conduct vacuum packaging in a clean environment; the stamping machine (3) includes a lower die base (31) embedded and installed on the upper surface of the machine case. A lower mold (32) is embedded and installed on the upper surface of the lower die base (31). A fixed seat (33) is connected to the upper surface of the lower die base (31). A stamping component (34) is installed on the top of the fixed seat (33). The bottom of the stamping component (34) passes through the fixed seat (33) and is connected to an upper die base (35). The bottom of the upper die base (35) is connected to the lower mold (32). The number of the lower molds (32) is four, and they are arranged at equal intervals in the lower die base (31). The module (1) is in a semi-circular tubular shape. A clamping block (2) is integrally connected to the bottom of the module (1). The clamping block (2) is bent at a right angle towards one side. The number of the clamping blocks (2) is two, and the two clamping blocks (2) are bent towards the same side at the bottom of the module (1). Two of the modules (1) are used in a set. The two modules (1) are clamped by the clamping blocks (2), and the two modules (1) are centrosymmetric. An activity groove (311) is opened inside the lower die base (31) on one side of the lower mold (32). A cavity (321) is opened inside the lower mold (32). A movable mold (322) is installed inside the cavity (321). A groove (323) is opened on one side of the movable mold (322). A first clamping mold (324) is installed on the inner wall of the cavity (321) on one side of the movable mold (322). A second clamping mold (325) is installed on the inner wall of the cavity (321) on the other side of the movable mold (322). A baffle (326) is installed inside the cavity (321) on one side of the movable mold (322). A driving mechanism (327) is connected to the side wall of the baffle (326). A chute (328) is opened inside the lower mold (32) below the movable mold (322). A mold opening mechanism (329) is installed inside the chute (328). The first clamping mold (324) and the second clamping mold (325) are both integrally connected to the lower mold (32). The second clamping mold (325) is movably inserted into the movable mold (322) through the groove (323). The movable mold (322) is slidably connected to the bottom surface of the cavity (321).

2. The preparation process of the high molecular weight polyethylene insulation layer module of the high-voltage cable capable of secondary molding according to claim 1, characterized in that: The driving mechanism (327) includes a fixed column (3271) installed at the center of the side wall of the baffle (326). The side of the fixed column (3271) away from the baffle (326) passes through the side wall of the lower mold (32) and is connected with a connecting plate (3272). A movable plate (3273) is vertically connected to the bottom of the connecting plate (3272), and an electric push rod (3274) is connected to one side of the movable plate (3273).

3. The preparation process of the high molecular weight polyethylene insulation layer module of the high-voltage cable capable of secondary forming according to claim 2, characterized in that: The baffle (326) is slidably connected to the bottom surface of the cavity (321). The baffle (326) is connected to the connecting plate (3272) through the fixed column (3271). The number of the baffle (326) and the connecting plate (3272) is four, and the bottoms of the four connecting plates (3272) are all connected to the movable plate (3273).

4. The preparation process of the high molecular weight polyethylene insulation layer module for high voltage cables that can be secondarily formed, characterized in that: The mold opening mechanism (329) includes a slider (3291) installed at the bottom of the movable mold (322). A screw hole (3292) is penetrated through the middle of the slider (3291). A screw rod (3293) is penetrated through the screw hole (3292). One end of the screw rod (3293) is connected with a motor (3294). The other end of the screw rod (3293) passes through the four lower molds (32) and a bearing (3297) is installed between the screw rod (3293) and the lower mold base (31). The number of the screw rods (3293) is two, and transmission wheels (3295) are installed on both of the two screw rods (3293). A transmission belt (3296) is connected between the two transmission wheels (3295).

5. The preparation process of the high molecular weight polyethylene insulation layer module of the high-voltage cable capable of secondary forming according to claim 4, characterized in that: The slider (3291) is stuck inside the chute (328) and forms a sliding connection with the chute (328). The screw rod (3293) sequentially passes through the four lower molds (32), and the screw rod (3293) forms a threaded connection with the sliders (3291) inside the four lower molds (32) through the screw holes (3292).

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