Preparation Equipment and Process of a Shielding Material for Ultra-Smooth and Water-Tree-Aging-Resistant Cables

Abstract

The present invention discloses a device and process for preparing shielding materials for ultra-smooth, water-tree-resistant, and aging-resistant cables, aiming to provide a device and process for preparing shielding materials for ultra-smooth, water-tree-resistant, and aging-resistant cables that ensures ultra-smoothness and aging resistance. The device comprises a mixing drum, which is provided with a material inlet, a sprayer, and a heating device. The left side of the mixing drum is connected to a first end cap, and the right side of the mixing drum is connected to a second end cap. The inner wall of the first end cap is provided with a track, and the inner wall of the track is provided with a plurality of gear teeth. A connecting rod is plugged into the first end cap, one end of the connecting rod is connected to a rotating mechanism, and the other end of the connecting rod is connected to a rotating rod. The rotating rod is rotatably connected to a shaft, one end of the shaft is connected to a rotating gear, and the rotating gear is placed in meshing connection with the track, and the other end of the shaft is connected to a turning plate. The lower end of the mixing drum is provided with a heat preservation chamber, and the heat preservation chamber is provided with a heating and heat preservation device. The lower end of the heat preservation chamber is provided with a cooling chamber. The beneficial effects of the present invention are: ensuring ultra-smoothness and aging resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to equipment and a process for preparing shielding materials for ultra-smooth, water-tree-resistant, and aging-resistant cables. Background Art

[0002] The so-called "shielding" in the cable structure is actually a measure to improve the electric field distribution. A shielding layer of semi-conductive material is added to the surface of the conductor. It has the same potential as the shielded conductor and is in good contact with the insulation layer, thereby avoiding local discharge between the conductor and the insulation layer. The surface of the shielding material must be kept smooth. At the same time, if there is liquid conductive material (such as water) in the shielding material, when the field strength at that location exceeds a certain value, the liquid will gradually penetrate into the insulation layer along the direction of the electric field, forming a tree-like trace called "water tree", which will cause damage to the cable.

[0003] China Patent Authorization Announcement Number: CN208177400U, Authorization Announcement Date: December 4, 2018, The present invention discloses a mixing and stirring device for processing semi-conductive shielding materials, comprising a stirring tank, a premixing tank and a stirring plate, wherein the stirring tank is mounted on a bracket, and the bracket is connected to each other through a shock-absorbing rod and an elastic component, and the elastic component is located on the inner side of a sleeve, the premixing tank is located above the stirring tank, and a feed hopper and a first motor are mounted on the premixing tank, and the first motor and the first rotating shaft are connected to each other, and a premixing plate is mounted on the first rotating shaft, the premixing tank is connected to a material fan through a discharge pipe, a discharge pipe is mounted on the stirring tank, and a second motor is mounted on the side of the stirring tank, and the second motor and the second rotating shaft are connected to each other, the stirring plate is connected to each other through a connecting rod and the second rotating shaft, a heating element is mounted on the stirring tank, and a feeding port and a discharge port are respectively provided on the side and bottom of the stirring tank. The shortcomings of this technical solution are that the mixing of the preparation device is not sufficient and thorough enough, and after the materials are mixed, it is impossible to ensure that the shielding material is not contaminated by impurities, which affects the smoothness of the shielding material. There is a lack of uniform drying of the shielding material and the additives, which affects the strength and elasticity of the shielding material, causing the shielding material to be prone to water tree aging, affecting the safety and life of the cable.

[0004] In summary, the shielding material cannot be mixed and dried uniformly enough and cannot be protected from contamination by impurities, which affects the smoothness and aging resistance of the shielding material. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art in that the devices cannot mix and dry the shielding material uniformly enough and cannot protect the shielding material from contamination by impurities, thereby affecting the smoothness and aging resistance of the shielding material. The present invention provides a preparation device and process for ultra-smooth water-tree-resistant cable shielding material that can mix and dry uniformly to achieve the effect of strengthening the material's resistance to water tree aging, smooth the surface of the shielding material, and extend the service life of the cable.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A preparation device for ultra-smooth, water-tree-resistant, and aging-resistant shielding material for cables, comprising a mixing drum, which is provided with a material feed port, a sprayer, and a heating device. The left side of the mixing drum is connected to a first end cover, and the right side of the mixing drum is connected to a second end cover. A track is provided on the inner wall of the first end cover, and a plurality of gear teeth are provided on the inner wall of the track. A connecting rod is plugged into the first end cover, one end of the connecting rod is connected to a rotating mechanism, and the other end of the connecting rod is connected to a rotating rod. A shaft is rotatably connected to the rotating rod, one end of the shaft is connected to a rotating gear, and the rotating gear is placed in a track for meshing connection, and the other end of the shaft is connected to a flipping plate. An insulation bin is provided at the lower end of the mixing drum, a heating and heat preservation device is provided in the insulation bin, and a cooling bin is provided at the lower end of the insulation bin. The mixing drum and the insulation bin are connected by an opening and closing mechanism 1, and the cooling bin and the insulation bin are connected by an opening and closing mechanism 2.

[0008] The mixing drum is arranged in a manner in which the two flat ends are placed upright and the arc-shaped cylindrical body is laid down. An inlet is provided at the upper end of the arc-shaped cylindrical body of the mixing drum for connection to the outlet of the centrifugal dehydrator, for transferring the material (shielding material) into the mixing drum. A sprayer is provided on one side of the inlet for spraying auxiliary materials. A heating device is provided on the mixing drum to heat the inside of the mixing drum. The left side of the mixing drum is provided with a first end cover to seal the left side of the mixing drum. A track is provided on the inner wall of the first end cover. The track is a circular depression on the surface of the first end cover. A circle of gear teeth is provided on the side wall inside the track. A connecting rod is plugged into the first end cover. A rotating mechanism is provided on the outside of the first end cover to connect with the connecting rod. One end of the connecting rod placed inside the mixing drum is connected to the rotating rod, and the rotating rod is rotated by the rotation of the connecting rod. A shaft is connected to the rotating rod. The shaft and the rotating rod are rotatably plug-in connected. The rotating gear is connected to the end of the shaft extending out of the rotating rod. At the same time, the rotating gear is placed in the track and is aligned with the gear teeth. The other end of the shaft extending out of the rotating rod is fixedly connected to the flipping plate, so that when the shaft is driven by the rotating rod to rotate, the flipping plate rotates along with the rotation of the rotating gear, thereby causing the flipping plate to rotate and flip simultaneously in the mixing drum. The side of the flipping plate is in contact with the arc-shaped inner wall of the mixing drum. The material entering the mixing drum is gathered at the bottom of the mixing drum under the action of gravity, and is then completely stirred by the rotating and flipping flipping plate, so that the mixing of the material and the auxiliary material is faster and more uniform, and the strength and elasticity of the material are enhanced through uniform mixing, and the material is dried at the same time, so as to achieve the effect of the material having resistance to water tree aging. An insulation bin is provided under the mixing drum, and a cooling bin is provided under the insulation bin. The mixing drum and the insulation bin are sealed and connected by an opening and closing mechanism 1, and the inner cavities of the insulation bin and the cooling bin are sealed and connected by an opening and closing mechanism 2. The insulation bin further reduces the moisture content of the material through long-term insulation and drying, and at the same time, the additive (cross-linking agent) is evenly diffused in the granular material to enhance the anti-water tree aging effect. At the same time, the material does not need to come into contact with the outside world during the overall operation in the cavities of the mixing drum, insulation bin and cooling bin, thereby preventing impurities from coming into contact with the material and affecting the smoothness of the material surface, thereby maintaining a smooth surface effect, ensuring the long-term stability of the shielding material, and extending the service life of the cable.

[0009] Preferably, a limited slide rail is provided on the inner wall of the second end cap, and a rotating block is connected to the flipping plate. The rotating block is positioned within the limited slide rail and slidably connected thereto. The limited slide rail is a circular depression on the inner wall of the second end cap, and the trajectory of the limited slide rail is the same as that of the track. The end face of the flipping plate is connected to the rotating block, and the rotating block is positioned within the limited slide rail to stabilize the flipping plate during rotation and enhance the smoothness of rotation.

[0010] Preferably, an insert is connected to the end face of the flipping plate, and a slot is provided on the end face of the rotating block, through which the insert is rotatably connected to the rotating block. The insert and slot are both T-shaped, and the insert fits into the slot, allowing the rotating block to rotate freely within the slot along the limited slide rail, thereby enhancing the smoothness of the flipping plate.

[0011] Preferably, a barrel is provided at the feed inlet, the upper end of the barrel is connected to the feed inlet, and a plurality of guide tubes are connected to both sides of the barrel, the guide tubes on the same side having different lengths, the feed inlet and the guide tubes are both connected to the barrel cavity, and a plurality of discharge ports are provided on the lower end face of the barrel. The barrel is placed in the mixing drum, the upper end of the barrel is connected to the inner wall of the mixing drum, the feed inlet is placed in the upper end of the barrel, and the feed inlet is connected to the barrel cavity, so that the material can enter the barrel, and the two ends of the barrel are connected to the guide tubes, which are arranged along the horizontal direction of the mixing drum. The guide tubes and discharge ports of different lengths allow the material to fall from different vertical positions of the mixing drum, thereby achieving the effect of evenly dispersing the material at various locations on the bottom of the mixing drum, making heating and mixing with auxiliary materials more uniform when turning the material, preventing uneven drying of the material, and further enhancing the material's anti-water tree aging effect.

[0012] Preferably, a feeding port is provided at the lower end of the mixing drum, and the opening and closing mechanism includes a sealing plate and a slider. The sealing plate is placed above the feeding port and is in contact with the feeding port. The sealing plate is slidably connected to the mixing drum. A slide groove is provided on the sealing plate, and an elastic mechanism is connected in the slide groove. The lower end of the slider is placed in the slide groove and connected to the elastic mechanism, and the upper end surface of the slider is an inclined surface. The material is directly fed into the mixing drum and the mixing drum is directly fed into the mixing drum, thereby preventing the mixing drum and the mixing drum from contacting with the outside world, thereby ensuring that the mixing drum and the mixing drum are directly fed into the mixing drum.

[0013] Preferably, the end face of the sealing plate is an arcuate surface, and a clearance groove is provided on the inner wall of the mixing drum. The notch of the clearance groove is opposite to one side of the arcuate surface of the sealing plate, and the structural shape of the clearance groove is adapted to the sealing plate. A clearance groove is provided on the inner wall of the mixing box to adapt to the sealing plate. The clearance groove is located on one side of the sealing plate, and the side of the sealing plate opposite the clearance groove is an arcuate surface. The material rolls along the arcuate surface during turning, so that the material is always gathered on the bottom surface of the mixing drum due to gravity during turning, preventing the material from being trapped in dead corners. The structural shape of the clearance groove is the same as that of the sealing plate, so that the groove wall of the clearance groove is also an arcuate surface, thereby achieving the effect of fully turning the material, ensuring uniform drying and mixing, and further enhancing the material's resistance to water tree aging.

[0014] Preferably, the opening and closing mechanism 2 includes a grille plate 1 and a grille plate 2, and both grille plate 1 and grille plate 2 are provided with a number of discharge ports. The lower end of the insulation bin is provided with a connecting port, grille plate 1 is embedded in the connecting port, grille plate 2 is placed below grille plate 1, grille plate 2 is slidably connected to the inner wall of the insulation bin, and the discharge ports on grille plate 1 and the discharge ports on grille plate 2 are staggered. The grid plate one and the grid plate two are stacked up and down, and the sides of the grid plate one are connected to the wall of the connecting port. The discharge port is a hole evenly arranged on the surface of the grid plate one and the grid plate two. The grid plate two can slide underneath the grid plate one, so that the discharge ports on the grid plate one and the grid plate two are staggered or opposite, so that the inner cavity of the heat preservation bin and the cooling bin can be kept independent, so that the material is placed at a constant temperature until the auxiliary material is evenly diffused in the granular material; or connected, so that the convenient material can quickly and directly enter the cooling bin under gravity, and at the same time, the material in the heat preservation bin that has entered the mixing drum first enters the cooling bin first at the bottom, so that the diffusion time of the material in the heat preservation bin is similar, and then the diffusion uniformity is similar, which ensures the drying and mixing uniformity to further enhance the material's anti-water tree aging effect.

[0015] Preferably, an opening is provided on the heat preservation bin, a telescopic mechanism is connected to the outer wall of the heat preservation bin, a fixed plate is provided on the side of the second grid plate, the fixed plate is plugged into the opening, one end of the fixed plate is connected to the second grid plate, and the other end of the fixed plate is connected to the telescopic mechanism. An opening is provided on the side of the heat preservation bin, the telescopic mechanism is provided on the outer wall of the heat preservation bin, the fixed plate is tightly plugged into the opening to prevent impurities from entering the heat preservation bin and the cooling bin through the opening, one end of the fixed plate is connected to the side of the second grid plate, the second grid plate is clamped on the inner wall of the fixed plate, and the other end of the fixed plate is connected to the telescopic mechanism, so that the second grid plate can slide and reset on the grid plate through the telescopic mechanism, so as to achieve the effect of neatly staggering or opposing the unloading opening on the first grid plate and the unloading opening on the second grid plate, thereby mechanizing the operation, improving the operation accuracy, and strengthening the stability of the structure.

[0016] Preferably, a guide plate is provided in the cooling bin, the side of the guide plate being connected to the bin wall of the cooling bin, one side of the guide plate being higher than the other opposite side, a collection outlet is provided on the cooling bin, a baffle plate is connected to the collection outlet, and the baffle plate is placed on the side of the cooling bin wall connected to the lower side of the guide plate. An inclined guide plate is provided in the cooling bin so that one side of the bottom of the cooling bin is higher than the other side, making it easier for the material to slide out of the cooling bin along the collection outlet after cooling. At the same time, a baffle plate is provided at the collection outlet to prevent the material from contacting the outside world when sealed collection is not ready, thereby ensuring the purity and smoothness of the material surface.

[0017] A preparation process of an ultra-smooth, water-tree-resistant, and aging-resistant shielding material for cables, comprising the following steps:

[0018] Step 1: Weigh 10-14 parts of polyethylene resin, 55-63 parts of ethylene-vinyl acetate polymer, 30-35 parts of conductive carbon black and 0.2-0.3 parts of antioxidant in parts by weight, add them into a mixer, and mix them evenly at a temperature of 150-200° C. to obtain a material;

[0019] Step 2: The material enters the melt pump for filtration, and the filtered material enters the single-screw granulator for granulation and cooling of the granules;

[0020] Step 3: The cooled particles are centrifuged and dried in a centrifugal dehydrator;

[0021] Step 4: Weigh the antioxidant and 0.6-1.0 parts of the cross-linking agent, put the cross-linking agent into the sprayer and wait for spraying;

[0022] Step 5: The inlet of the mixing drum is connected to the outlet of the centrifugal dehydrator, so that the material is fed into the mixing drum from the inlet. The material enters the mixing drum from the guide pipe and the outlet and is placed at the bottom of the mixing drum under the action of gravity;

[0023] Step 6: Start the rotating mechanism and heating equipment. The connecting rod drives the rotating rod to rotate on the first end cover, and then the shaft and the rotating gear are driven to move in the track and rotate inversely due to the meshing connection, thereby driving the rotation of the flipping plate to evenly heat the material.

[0024] Step 7: When the temperature in the mixing drum reaches 60-70°C, open the sprayer to spray the cross-linking agent onto the surface of the material and stir it evenly by the turning plate;

[0025] Step 8: Start the heating and heat preservation equipment to heat the heat preservation chamber to 60-70℃. The rotating mechanism rotates in the opposite direction, so that the flip plate pushes against the slider to slide the sealing plate into the clearance groove and expose the feeding port. The material enters the heat preservation chamber from the feeding port and is stored for 100-120 minutes.

[0026] Step 9: Start the telescopic mechanism to make the grid plate 2 slide. The discharge ports of grid plate 2 and grid plate 1 are opposite to each other. The material enters the cooling chamber from the discharge port and gradually reduces the temperature to 25~45 degrees. Open the baffle plate and the material is collected through the material collection port. The shielding material is completed.

[0027] The shielding material is composed of polyethylene resin, ethylene-vinyl acetate polymer, conductive carbon black, and an antioxidant, which are uniformly mixed in a mixer and then filtered in a melt pump. The filtered material enters a single-screw pelletizer for pelletizing and cooling, and is then centrifugally dehydrated and dried in a centrifugal dehydrator. The inlet of the mixing drum is connected to the outlet of the centrifugal dehydrator, allowing the shielding material to enter the drum directly. The auxiliary material is a cross-linking agent. A sprayer sprays the cross-linking agent into the heated and stirred shielding material to enhance its strength and elasticity. The heating and insulation equipment is activated to continuously maintain the temperature in the insulation bin. The rotating mechanism rotates in the opposite direction, causing the flip plate to push against the slider, causing the sealing plate to slide into the clearance groove and expose the feed port. The material enters the insulation bin from the feed port and continues to dry. At the same time, the cross-linking agent is evenly diffused into the shielding material. The telescopic mechanism is activated to cause the second grid plate to slide. The discharge ports of the second grid plate and the first grid plate are positioned relative to each other. The material enters the cooling bin from the discharge port and gradually cools down. The baffle is opened, and the material is collected through the material collection port, and the shielding material is completed.

[0028] The beneficial effects of the present invention are: uniform stirring, mixing and drying, strengthening the strength and elasticity of the material, achieving the effect of the shielding material being resistant to water tree aging, maintaining an ultra-smooth surface of the shielding material, ensuring the stability of the shielding material in long-term use, the structure of the device is stable, the operation is smooth and automatic, ensuring the operating accuracy, and extending the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a perspective view of the present invention;

[0030] Figure 2 yes Figure 1 sectional view of

[0031] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0033] Figure 5 yes Figure 2 Enlarged view of point C in the middle;

[0034] Figure 6 is a cross-sectional view of the mixing drum;

[0035] Figure 7 yes Figure 6 Cross-sectional view of the middle DD;

[0036] Figure 8 It is a structural diagram of the connection between the cylinder and the guide tube;

[0037] Figure 9 It is a structural diagram of the connection between the rotating gear and the turning plate;

[0038] Figure 10 This is a structural diagram of the connection between the grid plate 2 and the insulation bin;

[0039] Figure 11 is a schematic structural diagram of the first end cover;

[0040] Figure 12 Schematic diagram of the structure of the second end cover.

[0041] In the figure: 1. Mixing drum, 2. Feed inlet, 3. Sprinkler, 4. Heating device, 5. First end cover, 6. Second end cover, 7. Track, 8. Gear, 9. Connecting rod, 10. Rotating mechanism, 11. Rotating rod, 12. Shaft, 13. Rotating gear, 14. Turning plate, 15. Insulation chamber, 16. Heating and insulation equipment, 17. Cooling chamber, 18. Opening and closing mechanism 1, 19. Opening and closing mechanism 2, 20. Limiting slide rail, 21. Rotating mechanism Block, 22. Insert block, 23. Slot, 24. Cylinder, 25. Guide tube, 26. Discharge port, 27. Feed port, 28. Sealing plate, 29. Slider, 30. Slide, 31. Elastic mechanism, 32. Give way groove, 33. Grille plate 1, 34. Grille plate 2, 35. Discharge port, 36. Connecting port, 37. Opening, 38. Telescopic mechanism, 39. Fixed plate, 40. Guide plate, 41. Collecting discharge port, 42. Baffle plate. DETAILED DESCRIPTION

[0042] Example 1:

[0043] like Figure 1 、 2 As shown, a preparation device for ultra-smooth water-tree aging-resistant cable shielding material includes a mixing drum 1, on which a material inlet 2, a sprayer 3, and a heating device 4 are provided.

[0044] like Figure 2 、 9As shown in 11, the left side of the mixing drum 1 is connected to the first end cover 5, and the right side of the mixing drum 1 is connected to the second end cover 6. A track 7 is provided on the inner wall of the first end cover 5, and a plurality of gear teeth 8 are provided on the inner wall of the track 7. A connecting rod 9 is inserted into the first end cover 5, one end of the connecting rod 9 is connected to a rotating mechanism 10, and the other end of the connecting rod 9 is connected to a rotating rod 11. The rotating rod 11 is rotatably connected to a shaft rod 12, one end of the shaft rod 12 is connected to a rotating gear 13, and the rotating gear 13 is placed on the track 7 for meshing connection, and the other end of the shaft rod 12 is connected to a flipping plate 14. The lower end of the mixing drum 1 is provided with an insulation bin 15, and a heating and heat preservation device 16 is provided in the insulation bin 15. A cooling bin 17 is provided at the lower end of the insulation bin 15. The mixing drum 1 and the insulation bin 15 are connected by an opening and closing mechanism 18, and the cooling bin 17 and the insulation bin 15 are connected by an opening and closing mechanism 2 19.

[0045] like Figure 4 、 6 As shown in Figures 1 and 12, a limiting slide rail 20 is provided on the inner wall of the second end cover 6, and a rotating block 21 is connected to the flipping plate 14. The rotating block 21 is placed in the limiting slide rail 20 and is slidably connected to the limiting slide rail 20. An insert block 22 is connected to the end face of the flipping plate 14, and a slot 23 is provided on the end face of the rotating block 21. The insert block 22 is rotatably connected to the rotating block 21 through the slot 23.

[0046] like Figure 2 、 3 As shown in Figures 8 and 8, a cylinder 24 is provided at the feed port 2, the upper end of the cylinder 24 is connected to the feed port 2, and a plurality of guide tubes 25 are connected to both sides of the cylinder 24. The guide tubes 25 on the same side have different lengths. The feed port 2 and the guide tubes 25 are both connected to the cavity of the cylinder 24, and a plurality of discharge ports 26 are provided on the lower end face of the cylinder 24.

[0047] like Figure 2 、 7 As shown, the mixing drum 1 has a feed port 27 at its lower end. The opening and closing mechanism 18 includes a sealing plate 28 and a slider 29. The sealing plate 28 is positioned above and abuts the feed port 27. The sealing plate 28 is slidably connected to the mixing drum 1. A chute 30 is provided on the sealing plate 28, and an elastic mechanism 31 is connected thereto. The lower end of the slider 29 is positioned within the chute 30 and connected to the elastic mechanism 31. The upper end surface of the slider 29 is an inclined surface. The end surface of the sealing plate 28 is an arcuate surface. A clearance groove 32 is provided on the inner wall of the mixing drum 1. The notch of the clearance groove 32 faces one side of the arcuate surface of the sealing plate 28, and the structural shape of the clearance groove 32 matches that of the sealing plate 28.

[0048] like Figure 2 、 5As shown in Figures 10 and 11, the opening and closing mechanism 19 includes a first grille plate 33 and a second grille plate 34. Both the first grille plate 33 and the second grille plate 34 are provided with a plurality of discharge openings 35. A connection opening 36 is provided at the lower end of the heat preservation bin 15. The first grille plate 33 engages with the connection opening 36. The second grille plate 34 is positioned below the first grille plate 33. The second grille plate 34 is slidably connected to the inner wall of the heat preservation bin 15. The discharge openings 35 on the first grille plate 33 are staggered with the discharge openings 35 on the second grille plate 34. An opening 37 is provided in the heat preservation bin 15. A telescopic mechanism 38 is connected to the outer wall of the heat preservation bin 15. A fixed plate 39 is provided on the side of the second grille plate 34. The fixed plate 39 engages with the opening 37. One end of the fixed plate 39 is connected to the second grille plate 34, and the other end of the fixed plate 39 is connected to the telescopic mechanism 38.

[0049] like Figure 2 As shown, a guide plate 40 is provided in the cooling bin 17, and the side of the guide plate 40 is connected to the bin wall of the cooling bin 17. The height of one side of the guide plate 40 is higher than the height of the other opposite side. A collecting discharge port 41 is provided on the cooling bin 17, and a baffle plate 42 is inserted at the collecting discharge port 41. The baffle plate 42 is placed on the side of the bin wall of the cooling bin 17 connected to the lower side of the guide plate 40.

[0050] like Figure 1-12 As shown: the mixing drum 1 is a horizontal cylindrical structure, the first end cover 5 is connected to the left end of the mixing drum 1, the second end cover 6 is connected to the right end of the mixing drum 1, the feed port 2 is placed in the middle of the upper end of the mixing drum 1, and the external pipe of the feed port 2 is connected to the outlet of the centrifugal dehydrator, so that the material (shielding material) enters the cavity of the cylinder 24 from the feed port 2.

[0051] Two guide tubes 24 of varying lengths are arranged on either side of the drum 24. Two discharge ports 26 are also provided at the lower end of the drum 24. The positioning and diameter of the four guide tubes 24 are coordinated with the positioning and diameter of the two discharge ports 26, ensuring uniform material reception and accumulation at all locations within the lower floor of the mixing drum 1. This facilitates uniform material turning and heating by the turning plate 14. Two sprayers 3 (using spray guns) are provided, with the nozzles positioned at the top of the mixing drum 1. These sprayers are filled with a crosslinking agent, ensuring uniform material turning and penetration. Two heating devices 4 (using heaters) are provided, one mounted on the upper inner wall of the first end cap 5 and the other mounted on the upper inner wall of the second end cap 6. These two heating devices 4 heat the rolling material quickly and evenly.

[0052] The rotating mechanism 10 (using a rotating motor) is installed on the outer wall of the first end cover 5, and the connecting rod 9 is inserted into the first end cover 5 and can rotate. One end of the connecting rod 9 is connected to the rotating mechanism 10 and the other end is connected to the rotating rod 11. One side of the rotating rod 11 is attached to the inner wall of the first end cover 5. At the same time, the length of the rotating rod 11 and one side of the flipping plate 14 can be attached to the lower bottom of the mixing drum 1 cavity, and the other side of the flipping plate 14 is attached to the second end cover 6, so that the material at the bottom is completely turned over when turning over, preventing the material from being trapped at the lowest point or the existence of a dead corner for turning over.

[0053] A hole is provided on the rotating rod 11 for receiving the shaft 12, which rotates with the rotating rod 11. One end of the shaft 12 is connected to a rotating gear 13 placed in the track 7 and meshing with the track 7, and the other end is connected to the flipping plate 14, so that the flipping plate 14 can move around the circular trajectory of the track 7 while rotating itself, thereby improving the efficiency and uniformity of flipping. The rotating block 21 is embedded in the limiting slide 20 and is connected to the insert block 22 and the flipping plate 14 through the slot 23. The insert block 22 is formed by connecting two round rod-shaped structures of different diameters and has a T-shaped cross-section. The rotating block 21 can rotate against the limiting slide 20 when the flipping plate 14 moves and rotates, thereby stabilizing the flipping plate 14 while ensuring smooth movement.

[0054] The curved upper surface of the sealing plate 28 has the same height as the inner wall of the mixing drum 1, ensuring seamless connection between the two walls. This prevents the flip plate 14 from being unable to flip the material at the lowest point of the sealing plate 28. The relief groove 32 is shaped to fit within the sealing plate 28. Both sidewalls of the relief groove 29 are curved, and their outer surfaces connect to the sealing plate 28, facilitating the collection of material at the lowest point under gravity.

[0055] The heat preservation bin 15 is rectangular in shape, and the heating and heat preservation equipment 16 (using electric heaters) is installed on each side of the heat preservation bin 15 to ensure that the temperature in the heat preservation bin 15 is kept constant to allow the material to stand still and allow the cross-linking agent to penetrate deeper.

[0056] The chute 30 is arranged on the surface of the sealing plate 34, and the slider 29 is connected to the chute 30 through an elastic mechanism 31 (using a spring). The length of the slider 29 can completely enter the chute 30 under external force, and the inclined surface partially extends out of the chute 30 without external force. When the flipping plate 14 flips the material, the flipping direction is counterclockwise, and the inclined surface of the slider 29 faces the give way groove 32, so that the material rolls toward the direction without the give way groove 32. During this period, the slider 29 is pressed in and extended in a cycle to prevent the material from entering the chute 30 to form a dead corner, while not hindering the flipping plate 14 from flipping the material to the maximum extent.

[0057] The lower end of the connecting block 36 of the heat-insulating bin 15 is provided with a recessed slot for receiving the second grille plate 34. The first grille plate 33 is embedded in the upper end of the connecting port 36, allowing the second grille plate 34 to slide with the heat-insulating bin 15. The first grille plate 33 and the discharge opening 35 on the second grille plate 34 correspond to each other. The fixed plate 39 is connected to the second grille plate 34. The telescopic mechanism 38 (using a cylinder) and the L-shaped fixed plate 39 precisely advance and reset the connection, so that the discharge opening 35 is accurately aligned or staggered. The material blocking plate 42 seals the cooling bin 17, preventing impurities from entering the cooling bin 17, maintaining a smooth surface for the material, and allowing the material to be quickly collected through the oblique guide plate 40 and the collection outlet 41.

[0058] A preparation process of an ultra-smooth, water-tree-resistant, and aging-resistant shielding material for cables, comprising the following steps:

[0059] Step 1: 13 parts of polyethylene resin, 60 parts of ethylene-vinyl acetate polymer, 31 parts of conductive carbon black and 0.25 parts of antioxidant were weighed in parts by weight and added into a mixer, and mixed uniformly at a temperature of 180° C. to obtain a material;

[0060] Step 2: The material enters the melt pump for filtration, and the filtered material enters the single-screw granulator for granulation and cooling of the granules;

[0061] Step 3: The cooled particles are centrifuged and dried in a centrifugal dehydrator;

[0062] Step 4: Weigh the antioxidant and 0.7 parts of the cross-linking agent, and put the cross-linking agent into the sprayer 3 to wait for spraying;

[0063] Step 5: The inlet 2 of the mixing drum 1 is connected to the outlet of the centrifugal dehydrator, so that the material is fed into the mixing drum 1 from the inlet 2. The material enters the mixing drum 1 through the guide tube 25 and the outlet 26 and is placed at the bottom of the mixing drum 1 under the action of gravity;

[0064] Step 6: Start the rotating mechanism 10 and the heating device 4. The connecting rod 9 drives the rotating rod 11 to rotate on the first end cover 5, and then the shaft 12 rotates with it. The rotating gear 13 is driven to move in the track 7 and rotates inversely due to the meshing connection, thereby driving the rotation of the turning plate 14 to evenly heat the material.

[0065] Step 7: When the temperature in the mixing drum 1 reaches 65°C, the sprayer 3 is turned on to spray the cross-linking agent onto the surface of the material and the material is evenly stirred by the turning plate 14;

[0066] Step 8: Start the heating and heat preservation device 16 to heat the heat preservation chamber 15 to 65°C. The rotating mechanism 10 rotates in the opposite direction, causing the turning plate 14 to push against the slider 29 and slide the sealing plate 28 into the clearance groove 32 to expose the feeding port 27. The material enters the heat preservation chamber 15 through the feeding port 27 and is stored for 120 minutes.

[0067] Step nine: Start the telescopic mechanism 38 to make the grid plate 2 34 slide. The discharge openings 35 of the grid plate 2 34 and the grid plate 1 33 are positioned relative to each other. The material enters the cooling bin 17 from the discharge opening 35 and gradually cools down to 30 degrees. The baffle plate 42 is opened and the material is collected through the material collecting opening 41. The shielding material is completed.

Claims

1. A device for preparing shielding material for ultra-smooth, water-tree-resistant, and aging-resistant cables, characterized by: The invention comprises a mixing drum (1), wherein the mixing drum (1) is provided with a feeding port (2), a sprayer (3), and a heating device (4); the left side of the mixing drum (1) is connected to a first end cover (5); the right side of the mixing drum (1) is connected to a second end cover (6); the inner wall of the first end cover (5) is provided with a track (7); the inner wall of the track (7) is provided with a plurality of gear teeth (8); a connecting rod (9) is plugged into the first end cover (5); one end of the connecting rod (9) is connected to a rotating mechanism (10); the other end of the connecting rod (9) is connected to a rotating rod (11); a shaft (12) is rotatably connected to the rotating rod (11); one end of the shaft (12) is connected to a rotating gear (13); the rotating gear (13) is placed on the track (7) for meshing connection; the other end of the shaft (12) is connected to a turning plate (14); the lower end of the mixing drum (1) is provided with a heat preservation bin (11); 5), a heating and heat preservation device (16) is provided in the heat preservation chamber (15), a cooling chamber (17) is provided at the lower end of the heat preservation chamber (15), the mixing drum (1) and the heat preservation chamber (15) are connected by an opening and closing mechanism (18), the cooling chamber (17) and the heat preservation chamber (15) are connected by an opening and closing mechanism (19), a material passage (27) is provided at the lower end of the mixing drum (1), the opening and closing mechanism (18) includes a sealing plate (2 8) and a slider (29), the sealing plate (28) is placed above the material passage (27) and is in contact with the material passage (27), the sealing plate (28) is slidably connected to the mixing drum (1), the sealing plate (28) is provided with a slide groove (30), an elastic mechanism (31) is connected in the slide groove (30), the lower end of the slider (29) is placed in the slide groove (30) and is connected to the elastic mechanism (31), and the upper end surface of the slider (29) is an inclined surface.

2. The preparation equipment of the ultra-smooth water-tree aging-resistant cable shielding material according to claim 1, characterized in that: A limiting slide rail (20) is provided on the inner wall of the second end cover (6), and the flipping plate (14) is connected to a rotating block (21). The rotating block (21) is placed in the limiting slide rail (20) and is slidably connected to the limiting slide rail (20).

3. The preparation equipment of the ultra-smooth water-tree aging-resistant cable shielding material according to claim 2, characterized in that: The end surface of the flipping plate (14) is connected to an insert block (22), the end surface of the rotating block (21) is provided with a slot (23), and the insert block (22) is rotatably connected to the rotating block (21) via the slot (23).

4. The preparation equipment of the ultra-smooth water-tree aging-resistant cable shielding material according to claim 1, characterized in that: A barrel (24) is provided at the feed port (2), the upper end of the barrel (24) is connected to the feed port (2), and a plurality of guide tubes (25) are connected to both sides of the barrel (24). The guide tubes (25) on the same side have different lengths. The feed port (2) and the guide tubes (25) are both connected to the inner cavity of the barrel (24), and a plurality of discharge ports (26) are provided on the lower end surface of the barrel (24).

5. The equipment for preparing the ultra-smooth water-tree-resistant cable shielding material according to claim 1, characterized in that: The end surface of the sealing plate (28) is an arc-shaped surface, and a clearance groove (32) is provided on the inner wall of the mixing drum (1). The notch of the clearance groove (32) is opposite to one side of the arc-shaped surface of the sealing plate (28), and the structural shape of the clearance groove (32) is adapted to the sealing plate (28).

6. The equipment for preparing the ultra-smooth water-tree-resistant cable shielding material according to claim 1, characterized in that: The second opening and closing mechanism (19) includes a grid plate (33) and a grid plate (34), and the grid plate (33) and the grid plate (34) are both provided with a plurality of discharge ports (35). The lower end of the heat preservation bin (15) is provided with a connecting port (36), the grid plate (33) is engaged with the connecting port (36), the grid plate (34) is placed below the grid plate (33), the grid plate (34) is slidably connected to the inner wall of the heat preservation bin (15), and the discharge ports (35) on the grid plate (33) and the discharge ports (35) on the grid plate (34) are staggered.

7. The equipment for preparing the ultra-smooth water-tree-resistant cable shielding material according to claim 6, characterized in that: The heat preservation bin (15) is provided with an opening (37), the outer wall of the heat preservation bin (15) is connected to a telescopic mechanism (38), a side surface of the second grid plate (34) is provided with a fixing plate (39), the fixing plate (39) is plugged into the opening (37), one end of the fixing plate (39) is connected to the second grid plate (34), and the other end of the fixing plate (39) is connected to the telescopic mechanism (38).

8. The equipment for preparing the ultra-smooth water-tree-resistant cable shielding material according to claim 1, characterized in that: A guide plate (40) is provided in the cooling bin (17), and a side surface of the guide plate (40) is connected to the bin wall of the cooling bin (17). The height of one side of the guide plate (40) is higher than the height of the other opposite side surface. A collecting discharge port (41) is provided on the cooling bin (17), and a baffle plate (42) is plugged into the collecting discharge port (41). The baffle plate (42) is placed on the side surface of the bin wall of the cooling bin (17) connected to the lower side of the guide plate (40).

9. A process for preparing ultra-smooth water-tree-resistant cable shielding material, using the preparation equipment according to any one of claims 1 to 8, characterized in that: The specific steps include: Step 1: Weigh 10-14 parts of polyethylene resin, 55-63 parts of ethylene-vinyl acetate polymer, 30-35 parts of conductive carbon black and 0.2-0.3 parts of antioxidant in parts by weight, add them into a mixer, and mix them evenly at a temperature of 150-200° C. to obtain a material; Step 2: The material enters the melt pump for filtration, and the filtered material enters the single-screw granulator for granulation and cooling of the granules; Step 3: The cooled particles are centrifuged and dried in a centrifugal dehydrator; Step 4: Weigh 0.6 to 1.0 parts of a cross-linking agent and place the cross-linking agent into a sprayer (3) for spraying; Step 5: The inlet (2) of the mixing drum (1) is connected to the outlet of the centrifugal dehydrator, so that the material is fed into the mixing drum (1) from the inlet (2), and the material enters the mixing drum (1) from the guide tube (25) and the outlet (26) and is placed at the bottom of the mixing drum (1) under the action of gravity; Step 6: Start the rotating mechanism (10) and the heating device (4), the connecting rod (9) drives the rotating rod (11) to rotate on the first end cover (5), and then the shaft (12) rotates accordingly, the rotating gear (13) is driven to move in the track (7) and rotates due to the meshing connection, and then drives the turning plate (14) to rotate and turn the material, so that the material is evenly heated; Step 7: When the temperature in the mixing drum (1) reaches 60-70°C, the sprayer (3) is turned on to spray the cross-linking agent onto the surface of the material and the material is stirred evenly by the turning plate (14); Step 8: Start the heating and heat preservation device (16) to heat the heat preservation bin (15) to 60-70°C, and the rotating mechanism (10) rotates in the opposite direction, so that the turning plate (14) pushes against the slider (29) to slide the sealing plate (28) into the clearance groove (32) and expose the feeding port (27). The material enters the heat preservation bin (15) from the feeding port (27) and is stored for 100-120 minutes; Step 9: Start the telescopic mechanism (38) to slide the grid plate 2 (34). The discharge openings (35) of the grid plate 2 (34) and the grid plate 1 (33) are positioned relative to each other. The material enters the cooling chamber (17) from the discharge opening (35) and gradually cools down to 25-45 degrees. The baffle plate (42) is opened and the material is collected through the collection outlet (41). The shielding material is completed.

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